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Author SHA1 Message Date
Abel Luck
d8c925b817 agent: complete plan05 closeout 2026-02-27 13:48:52 +01:00
Abel Luck
33ba248c49 agent: implement api 2026-02-27 12:46:32 +01:00
Abel Luck
b63d69c81d add runtime adapters, scheduler, reconciler, and their unit tests 2026-02-27 12:34:32 +01:00
Abel Luck
d1976a5fd8 add buildbot extension for autoscaling nix builders 2026-02-27 12:17:36 +01:00
Abel Luck
ea12318b88 add license 2026-02-27 11:59:58 +01:00
Abel Luck
28059dcedf WIP autoscaler agent 2026-02-27 11:59:16 +01:00
47 changed files with 8480 additions and 35 deletions
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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"""Nix builder autoscaler daemon."""
__version__ = "0.1.0"

255
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"""Daemon entry point: python -m nix_builder_autoscaler."""
from __future__ import annotations
import argparse
import logging
import signal
import threading
import time
from pathlib import Path
from types import FrameType
import uvicorn
from .api import create_app
from .config import AppConfig, load_config
from .logging import setup_logging
from .metrics import MetricsRegistry
from .providers.clock import SystemClock
from .providers.haproxy import HAProxyRuntime
from .reconciler import Reconciler
from .runtime.ec2 import EC2Runtime
from .scheduler import scheduling_tick
from .state_db import StateDB
log = logging.getLogger(__name__)
class LoopHealth:
"""Thread-safe last-success timestamps for daemon loops."""
def __init__(self) -> None:
self._lock = threading.Lock()
self._last_success: dict[str, float] = {}
def mark_success(self, loop_name: str) -> None:
with self._lock:
self._last_success[loop_name] = time.monotonic()
def is_fresh(self, loop_name: str, max_age_seconds: float) -> bool:
with self._lock:
last = self._last_success.get(loop_name)
if last is None:
return False
return (time.monotonic() - last) <= max_age_seconds
def _max_staleness(interval_seconds: float) -> float:
return max(interval_seconds * 3.0, 15.0)
def _scheduler_loop(
db: StateDB,
runtime: EC2Runtime,
config: AppConfig,
clock: SystemClock,
metrics: MetricsRegistry,
stop_event: threading.Event,
loop_health: LoopHealth,
) -> None:
while not stop_event.is_set():
try:
scheduling_tick(db, runtime, config, clock, metrics)
loop_health.mark_success("scheduler")
except Exception:
log.exception("scheduler_tick_failed")
stop_event.wait(config.scheduler.tick_seconds)
def _reconciler_loop(
reconciler: Reconciler,
config: AppConfig,
stop_event: threading.Event,
loop_health: LoopHealth,
reconcile_lock: threading.Lock,
) -> None:
while not stop_event.is_set():
try:
with reconcile_lock:
reconciler.tick()
loop_health.mark_success("reconciler")
except Exception:
log.exception("reconciler_tick_failed")
stop_event.wait(config.scheduler.reconcile_seconds)
def _metrics_health_loop(
metrics: MetricsRegistry,
stop_event: threading.Event,
loop_health: LoopHealth,
interval_seconds: float,
) -> None:
while not stop_event.is_set():
try:
metrics.gauge("autoscaler_loop_up", {"loop": "scheduler"}, 1.0)
metrics.gauge("autoscaler_loop_up", {"loop": "reconciler"}, 1.0)
metrics.gauge("autoscaler_loop_up", {"loop": "metrics"}, 1.0)
loop_health.mark_success("metrics")
except Exception:
log.exception("metrics_health_tick_failed")
stop_event.wait(interval_seconds)
def _parse_args() -> argparse.Namespace:
parser = argparse.ArgumentParser(
prog="nix-builder-autoscaler",
description="Nix builder autoscaler daemon",
)
parser.add_argument("--config", required=True, help="Path to TOML config file")
return parser.parse_args()
def main() -> None:
"""Parse config, initialize components, and run the daemon."""
args = _parse_args()
config = load_config(Path(args.config))
setup_logging(config.server.log_level)
clock = SystemClock()
db = StateDB(config.server.db_path, clock=clock)
db.init_schema()
db.init_slots(
config.haproxy.slot_prefix,
config.haproxy.slot_count,
config.capacity.default_system,
config.haproxy.backend,
)
runtime = EC2Runtime(config.aws)
haproxy = HAProxyRuntime(
config.haproxy.runtime_socket,
config.haproxy.backend,
config.haproxy.slot_prefix,
)
metrics = MetricsRegistry()
reconciler = Reconciler(db, runtime, haproxy, config, clock, metrics)
reconciler.tick()
stop_event = threading.Event()
scheduler_thread: threading.Thread | None = None
reconciler_thread: threading.Thread | None = None
metrics_thread: threading.Thread | None = None
server: uvicorn.Server | None = None
loop_health = LoopHealth()
reconcile_lock = threading.Lock()
metrics_interval = 5.0
def scheduler_running() -> bool:
return scheduler_thread is not None and scheduler_thread.is_alive()
def reconciler_running() -> bool:
return reconciler_thread is not None and reconciler_thread.is_alive()
def metrics_running() -> bool:
return metrics_thread is not None and metrics_thread.is_alive()
def ready_check() -> bool:
checks = [
("scheduler", scheduler_running(), _max_staleness(config.scheduler.tick_seconds)),
(
"reconciler",
reconciler_running(),
_max_staleness(config.scheduler.reconcile_seconds),
),
("metrics", metrics_running(), _max_staleness(metrics_interval)),
]
for loop_name, alive, max_age in checks:
if not alive:
return False
if not loop_health.is_fresh(loop_name, max_age):
return False
return True
def reconcile_now() -> dict[str, object]:
with reconcile_lock:
reconciler.tick()
loop_health.mark_success("reconciler")
return {"triggered": True}
app = create_app(
db,
config,
clock,
metrics,
runtime=runtime,
haproxy=haproxy,
scheduler_running=scheduler_running,
reconciler_running=reconciler_running,
ready_check=ready_check,
reconcile_now=reconcile_now,
)
loop_health.mark_success("scheduler")
loop_health.mark_success("reconciler")
loop_health.mark_success("metrics")
scheduler_thread = threading.Thread(
target=_scheduler_loop,
name="autoscaler-scheduler",
args=(db, runtime, config, clock, metrics, stop_event, loop_health),
daemon=True,
)
reconciler_thread = threading.Thread(
target=_reconciler_loop,
name="autoscaler-reconciler",
args=(reconciler, config, stop_event, loop_health, reconcile_lock),
daemon=True,
)
metrics_thread = threading.Thread(
target=_metrics_health_loop,
name="autoscaler-metrics-health",
args=(metrics, stop_event, loop_health, metrics_interval),
daemon=True,
)
scheduler_thread.start()
reconciler_thread.start()
metrics_thread.start()
socket_path = Path(config.server.socket_path)
socket_path.parent.mkdir(parents=True, exist_ok=True)
if socket_path.exists():
socket_path.unlink()
uvicorn_config = uvicorn.Config(
app=app,
uds=config.server.socket_path,
log_level=config.server.log_level.lower(),
)
server = uvicorn.Server(uvicorn_config)
def _handle_signal(signum: int, _: FrameType | None) -> None:
log.info("shutdown_signal", extra={"signal": signum})
stop_event.set()
if server is not None:
server.should_exit = True
signal.signal(signal.SIGTERM, _handle_signal)
signal.signal(signal.SIGINT, _handle_signal)
try:
server.run()
finally:
stop_event.set()
if scheduler_thread is not None:
scheduler_thread.join(timeout=10)
if reconciler_thread is not None:
reconciler_thread.join(timeout=10)
if metrics_thread is not None:
metrics_thread.join(timeout=10)
db.close()
if __name__ == "__main__":
main()

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"""FastAPI application for the autoscaler daemon."""
from __future__ import annotations
import logging
import uuid
from collections.abc import Callable
from datetime import datetime
from typing import TYPE_CHECKING, NoReturn
from fastapi import FastAPI, HTTPException, Request, Response
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from .models import (
CapacityHint,
ErrorDetail,
ErrorResponse,
HealthResponse,
ReservationPhase,
ReservationRequest,
ReservationResponse,
SlotInfo,
SlotState,
StateSummary,
)
if TYPE_CHECKING:
from .config import AppConfig
from .metrics import MetricsRegistry
from .providers.clock import Clock
from .providers.haproxy import HAProxyRuntime
from .runtime.base import RuntimeAdapter
from .state_db import StateDB
log = logging.getLogger(__name__)
class SlotAdminRequest(BaseModel):
"""Admin action request that targets a slot."""
slot_id: str
def _parse_required_dt(value: str) -> datetime:
return datetime.fromisoformat(value)
def _parse_optional_dt(value: str | None) -> datetime | None:
if value is None:
return None
return datetime.fromisoformat(value)
def _resv_to_response(resv: dict) -> ReservationResponse:
return ReservationResponse(
reservation_id=str(resv["reservation_id"]),
phase=ReservationPhase(str(resv["phase"])),
slot=resv.get("slot_id"),
instance_id=resv.get("instance_id"),
system=str(resv["system"]),
created_at=_parse_required_dt(str(resv["created_at"])),
updated_at=_parse_required_dt(str(resv["updated_at"])),
expires_at=_parse_required_dt(str(resv["expires_at"])),
released_at=_parse_optional_dt(resv.get("released_at")),
)
def _slot_to_info(slot: dict) -> SlotInfo:
return SlotInfo(
slot_id=str(slot["slot_id"]),
system=str(slot["system"]),
state=SlotState(str(slot["state"])),
instance_id=slot.get("instance_id"),
instance_ip=slot.get("instance_ip"),
lease_count=int(slot["lease_count"]),
last_state_change=_parse_required_dt(str(slot["last_state_change"])),
)
def _error_response(
request: Request,
status_code: int,
code: str,
message: str,
retryable: bool = False,
) -> NoReturn:
request_id = getattr(request.state, "request_id", str(uuid.uuid4()))
payload = ErrorResponse(
error=ErrorDetail(code=code, message=message, retryable=retryable),
request_id=request_id,
)
raise HTTPException(status_code=status_code, detail=payload.model_dump(mode="json"))
def create_app(
db: StateDB,
config: AppConfig,
clock: Clock,
metrics: MetricsRegistry,
runtime: RuntimeAdapter | None = None,
haproxy: HAProxyRuntime | None = None,
scheduler_running: Callable[[], bool] | None = None,
reconciler_running: Callable[[], bool] | None = None,
ready_check: Callable[[], bool] | None = None,
reconcile_now: Callable[[], dict[str, object] | None] | None = None,
) -> FastAPI:
"""Create the FastAPI application."""
app = FastAPI(title="nix-builder-autoscaler", version="0.1.0")
app.state.db = db
app.state.config = config
app.state.clock = clock
app.state.metrics = metrics
app.state.runtime = runtime
app.state.haproxy = haproxy
@app.middleware("http")
async def request_id_middleware(request: Request, call_next: Callable) -> Response:
request.state.request_id = str(uuid.uuid4())
response = await call_next(request)
response.headers["x-request-id"] = request.state.request_id
return response
@app.exception_handler(HTTPException)
async def http_exception_handler(request: Request, exc: HTTPException) -> JSONResponse:
detail = exc.detail
if isinstance(detail, dict) and "error" in detail and "request_id" in detail:
return JSONResponse(status_code=exc.status_code, content=detail)
request_id = getattr(request.state, "request_id", str(uuid.uuid4()))
payload = ErrorResponse(
error=ErrorDetail(
code="http_error",
message=str(detail) if detail else "Request failed",
retryable=False,
),
request_id=request_id,
)
return JSONResponse(status_code=exc.status_code, content=payload.model_dump(mode="json"))
@app.post("/v1/reservations", response_model=ReservationResponse)
def create_reservation(body: ReservationRequest) -> ReservationResponse:
resv = db.create_reservation(
body.system,
body.reason,
body.build_id,
config.capacity.reservation_ttl_seconds,
)
return _resv_to_response(resv)
@app.get("/v1/reservations/{reservation_id}", response_model=ReservationResponse)
def get_reservation(reservation_id: str, request: Request) -> ReservationResponse:
resv = db.get_reservation(reservation_id)
if resv is None:
_error_response(request, 404, "not_found", "Reservation not found")
return _resv_to_response(resv)
@app.post("/v1/reservations/{reservation_id}/release", response_model=ReservationResponse)
def release_reservation(reservation_id: str, request: Request) -> ReservationResponse:
resv = db.release_reservation(reservation_id)
if resv is None:
_error_response(request, 404, "not_found", "Reservation not found")
return _resv_to_response(resv)
@app.get("/v1/reservations", response_model=list[ReservationResponse])
def list_reservations(
phase: ReservationPhase | None = None,
) -> list[ReservationResponse]:
reservations = db.list_reservations(phase)
return [_resv_to_response(resv) for resv in reservations]
@app.get("/v1/slots", response_model=list[SlotInfo])
def list_slots() -> list[SlotInfo]:
slots = db.list_slots()
return [_slot_to_info(slot) for slot in slots]
@app.get("/v1/state/summary", response_model=StateSummary)
def state_summary() -> StateSummary:
summary = db.get_state_summary()
return StateSummary.model_validate(summary)
@app.post("/v1/hints/capacity")
def capacity_hint(hint: CapacityHint) -> dict[str, str]:
log.info(
"capacity_hint",
extra={
"builder": hint.builder,
"queued": hint.queued,
"running": hint.running,
"system": hint.system,
"timestamp": hint.timestamp.isoformat(),
},
)
return {"status": "accepted"}
@app.get("/health/live", response_model=HealthResponse)
def health_live() -> HealthResponse:
return HealthResponse(status="ok")
@app.get("/health/ready", response_model=HealthResponse)
def health_ready() -> HealthResponse:
if ready_check is not None and not ready_check():
return JSONResponse( # type: ignore[return-value]
status_code=503,
content=HealthResponse(status="degraded").model_dump(mode="json"),
)
if scheduler_running is not None and not scheduler_running():
return JSONResponse( # type: ignore[return-value]
status_code=503,
content=HealthResponse(status="degraded").model_dump(mode="json"),
)
if reconciler_running is not None and not reconciler_running():
return JSONResponse( # type: ignore[return-value]
status_code=503,
content=HealthResponse(status="degraded").model_dump(mode="json"),
)
return HealthResponse(status="ok")
@app.get("/metrics")
def metrics_endpoint() -> Response:
return Response(content=metrics.render(), media_type="text/plain")
@app.post("/v1/admin/drain")
def admin_drain(body: SlotAdminRequest, request: Request) -> dict[str, str]:
slot = db.get_slot(body.slot_id)
if slot is None:
_error_response(request, 404, "not_found", "Slot not found")
state = str(slot["state"])
if state == SlotState.DRAINING.value or state == SlotState.TERMINATING.value:
return {"status": "accepted", "slot_id": body.slot_id, "state": state}
allowed_states = {
SlotState.READY.value,
SlotState.BINDING.value,
SlotState.BOOTING.value,
SlotState.LAUNCHING.value,
}
if state not in allowed_states:
_error_response(
request,
409,
"invalid_state",
f"Cannot drain slot from state {state}",
)
db.update_slot_state(body.slot_id, SlotState.DRAINING, interruption_pending=0)
return {"status": "accepted", "slot_id": body.slot_id, "state": SlotState.DRAINING.value}
@app.post("/v1/admin/unquarantine")
def admin_unquarantine(body: SlotAdminRequest, request: Request) -> dict[str, str]:
slot = db.get_slot(body.slot_id)
if slot is None:
_error_response(request, 404, "not_found", "Slot not found")
state = str(slot["state"])
if state != SlotState.ERROR.value:
_error_response(
request,
409,
"invalid_state",
f"Cannot unquarantine slot from state {state}",
)
db.update_slot_state(
body.slot_id,
SlotState.EMPTY,
instance_id=None,
instance_ip=None,
instance_launch_time=None,
lease_count=0,
cooldown_until=None,
interruption_pending=0,
)
return {"status": "accepted", "slot_id": body.slot_id, "state": SlotState.EMPTY.value}
@app.post("/v1/admin/reconcile-now")
def admin_reconcile_now(request: Request) -> dict[str, object]:
if reconcile_now is None:
_error_response(
request,
503,
"not_configured",
"Reconcile trigger not configured",
retryable=True,
)
try:
result = reconcile_now()
except Exception:
log.exception("admin_reconcile_now_failed")
_error_response(
request,
500,
"reconcile_failed",
"Reconcile tick failed",
retryable=True,
)
payload: dict[str, object] = {"status": "accepted"}
if isinstance(result, dict):
payload.update(result)
return payload
return app

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agent/nix_builder_autoscaler/bootstrap/__init__.py Normal file
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agent/nix_builder_autoscaler/bootstrap/userdata.py Normal file
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"""EC2 user-data template rendering for builder instance bootstrap.
The generated script follows the NixOS AMI pattern: write config files
that existing systemd services (tailscale-autoconnect, nix-daemon) consume,
rather than calling ``tailscale up`` directly.
"""
from __future__ import annotations
import textwrap
def render_userdata(slot_id: str, region: str, ssm_param: str = "/nix-builder/ts-authkey") -> str:
"""Render a bash user-data script for builder instance bootstrap.
The returned string is a complete shell script. On NixOS AMIs the script
is executed by ``amazon-init.service``. The caller (EC2Runtime) passes it
to ``run_instances`` as ``UserData``; boto3 base64-encodes automatically.
Args:
slot_id: Autoscaler slot identifier (used as Tailscale hostname suffix).
region: AWS region for SSM parameter lookup.
ssm_param: SSM parameter path containing the Tailscale auth key.
"""
return textwrap.dedent(f"""\
#!/usr/bin/env bash
set -euo pipefail
SLOT_ID="{slot_id}"
REGION="{region}"
SSM_PARAM="{ssm_param}"
# --- Fetch Tailscale auth key from SSM Parameter Store ---
mkdir -p /run/credentials
TS_AUTHKEY=$(aws ssm get-parameter \\
--region "$REGION" \\
--with-decryption \\
--name "$SSM_PARAM" \\
--query 'Parameter.Value' \\
--output text)
printf '%s' "$TS_AUTHKEY" > /run/credentials/tailscale-auth-key
chmod 600 /run/credentials/tailscale-auth-key
# --- Resolve instance identity from IMDSv2 for unique hostname ---
IMDS_TOKEN=$(curl -fsS -X PUT "http://169.254.169.254/latest/api/token" \\
-H "X-aws-ec2-metadata-token-ttl-seconds: 21600" || true)
INSTANCE_ID=$(curl -fsS -H "X-aws-ec2-metadata-token: $IMDS_TOKEN" \\
"http://169.254.169.254/latest/meta-data/instance-id" || true)
if [ -z "$INSTANCE_ID" ]; then
INSTANCE_ID="unknown"
fi
# --- Write tailscale-autoconnect config ---
mkdir -p /etc/tailscale
cat > /etc/tailscale/autoconnect.conf <<TSCONF
TS_AUTHKEY_FILE=/run/credentials/tailscale-auth-key
TS_AUTHKEY_EPHEMERAL=true
TS_AUTHKEY_PREAUTHORIZED=true
TS_HOSTNAME=nix-builder-$SLOT_ID-$INSTANCE_ID
TS_EXTRA_ARGS="--ssh --advertise-tags=tag:nix-builder"
TSCONF
# --- Start/restart tailscale-autoconnect so it picks up the config ---
systemctl restart tailscale-autoconnect.service || true
# --- Ensure nix-daemon is running ---
systemctl start nix-daemon.service || true
# --- Signal readiness ---
echo "ready" > /run/nix-builder-ready
""")

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"""autoscalerctl CLI entry point."""
from __future__ import annotations
import argparse
import http.client
import json
import socket
from collections.abc import Sequence
from typing import Any
class UnixHTTPConnection(http.client.HTTPConnection):
"""HTTPConnection that dials a Unix domain socket."""
def __init__(self, socket_path: str, timeout: float = 5.0) -> None:
super().__init__("localhost", timeout=timeout)
self._socket_path = socket_path
def connect(self) -> None:
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.sock.connect(self._socket_path)
def _uds_request(
socket_path: str,
method: str,
path: str,
body: dict[str, Any] | None = None,
) -> tuple[int, dict[str, Any] | list[dict[str, Any]] | str]:
conn = UnixHTTPConnection(socket_path)
headers = {"Host": "localhost", "Accept": "application/json"}
payload: str | None = None
if body is not None:
payload = json.dumps(body)
headers["Content-Type"] = "application/json"
try:
conn.request(method, path, body=payload, headers=headers)
resp = conn.getresponse()
raw = resp.read()
text = raw.decode() if raw else ""
content_type = resp.getheader("Content-Type", "")
if text and "application/json" in content_type:
parsed = json.loads(text)
if isinstance(parsed, dict | list):
return resp.status, parsed
return resp.status, text
finally:
conn.close()
def _print_table(headers: Sequence[str], rows: Sequence[Sequence[str]]) -> None:
widths = [len(h) for h in headers]
for row in rows:
for idx, cell in enumerate(row):
widths[idx] = max(widths[idx], len(cell))
header_line = " ".join(h.ljust(widths[idx]) for idx, h in enumerate(headers))
separator = " ".join("-" * widths[idx] for idx in range(len(headers)))
print(header_line)
print(separator)
for row in rows:
print(" ".join(cell.ljust(widths[idx]) for idx, cell in enumerate(row)))
def _print_slots(data: list[dict[str, Any]]) -> None:
rows: list[list[str]] = []
for slot in data:
rows.append(
[
str(slot.get("slot_id", "")),
str(slot.get("state", "")),
str(slot.get("instance_id") or "-"),
str(slot.get("instance_ip") or "-"),
str(slot.get("lease_count", 0)),
]
)
_print_table(["slot_id", "state", "instance_id", "ip", "leases"], rows)
def _print_reservations(data: list[dict[str, Any]]) -> None:
rows: list[list[str]] = []
for resv in data:
rows.append(
[
str(resv.get("reservation_id", "")),
str(resv.get("phase", "")),
str(resv.get("system", "")),
str(resv.get("slot") or "-"),
str(resv.get("instance_id") or "-"),
]
)
_print_table(["reservation_id", "phase", "system", "slot", "instance_id"], rows)
def _parse_args() -> argparse.Namespace:
parser = argparse.ArgumentParser(prog="autoscalerctl", description="Autoscaler CLI")
parser.add_argument(
"--socket",
default="/run/nix-builder-autoscaler/daemon.sock",
help="Daemon Unix socket path",
)
subparsers = parser.add_subparsers(dest="command")
subparsers.add_parser("status", help="Show state summary")
subparsers.add_parser("slots", help="List slots")
subparsers.add_parser("reservations", help="List reservations")
parser_drain = subparsers.add_parser("drain", help="Drain a slot")
parser_drain.add_argument("slot_id")
parser_unq = subparsers.add_parser("unquarantine", help="Unquarantine a slot")
parser_unq.add_argument("slot_id")
subparsers.add_parser("reconcile-now", help="Trigger immediate reconcile tick")
return parser.parse_args()
def _print_error(data: object) -> None:
if isinstance(data, dict | list):
print(json.dumps(data, indent=2))
else:
print(str(data))
def main() -> None:
"""Entry point for the autoscalerctl CLI."""
args = _parse_args()
if not args.command:
raise SystemExit(1)
method = "GET"
path = ""
body: dict[str, Any] | None = None
if args.command == "status":
path = "/v1/state/summary"
elif args.command == "slots":
path = "/v1/slots"
elif args.command == "reservations":
path = "/v1/reservations"
elif args.command == "drain":
method = "POST"
path = "/v1/admin/drain"
body = {"slot_id": args.slot_id}
elif args.command == "unquarantine":
method = "POST"
path = "/v1/admin/unquarantine"
body = {"slot_id": args.slot_id}
elif args.command == "reconcile-now":
method = "POST"
path = "/v1/admin/reconcile-now"
else:
raise SystemExit(1)
try:
status, data = _uds_request(args.socket, method, path, body=body)
except OSError as err:
print(f"Error: cannot connect to daemon at {args.socket}")
raise SystemExit(1) from err
if status < 200 or status >= 300:
_print_error(data)
raise SystemExit(1)
if args.command in {"status", "drain", "unquarantine", "reconcile-now"}:
print(json.dumps(data, indent=2))
elif args.command == "slots":
if isinstance(data, list):
_print_slots(data)
else:
_print_error(data)
raise SystemExit(1)
elif args.command == "reservations":
if isinstance(data, list):
_print_reservations(data)
else:
_print_error(data)
raise SystemExit(1)
raise SystemExit(0)
if __name__ == "__main__":
main()

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"""Configuration loading from TOML with environment variable overrides."""
from __future__ import annotations
import os
import tomllib
from dataclasses import dataclass, field
from pathlib import Path
@dataclass
class ServerConfig:
"""[server] section."""
socket_path: str = "/run/nix-builder-autoscaler/daemon.sock"
log_level: str = "info"
db_path: str = "/var/lib/nix-builder-autoscaler/state.db"
@dataclass
class AwsConfig:
"""[aws] section."""
region: str = "us-east-1"
launch_template_id: str = ""
subnet_ids: list[str] = field(default_factory=list)
security_group_ids: list[str] = field(default_factory=list)
instance_profile_arn: str = ""
@dataclass
class HaproxyConfig:
"""[haproxy] section."""
runtime_socket: str = "/run/haproxy/admin.sock"
backend: str = "all"
slot_prefix: str = "slot"
slot_count: int = 8
check_ready_up_count: int = 2
@dataclass
class SystemConfig:
"""[[systems]] entry for per-architecture capacity policy."""
name: str = "x86_64-linux"
min_slots: int = 0
max_slots: int = 8
target_warm_slots: int = 0
max_leases_per_slot: int = 1
launch_batch_size: int = 1
scale_down_idle_seconds: int = 900
@dataclass
class CapacityConfig:
"""[capacity] section — global defaults."""
default_system: str = "x86_64-linux"
min_slots: int = 0
max_slots: int = 8
target_warm_slots: int = 0
max_leases_per_slot: int = 1
reservation_ttl_seconds: int = 1200
idle_scale_down_seconds: int = 900
drain_timeout_seconds: int = 120
@dataclass
class SecurityConfig:
"""[security] section."""
socket_mode: str = "0660"
socket_owner: str = "buildbot"
socket_group: str = "buildbot"
@dataclass
class SchedulerConfig:
"""[scheduler] section."""
tick_seconds: float = 3.0
reconcile_seconds: float = 15.0
@dataclass
class AppConfig:
"""Top-level application configuration."""
server: ServerConfig = field(default_factory=ServerConfig)
aws: AwsConfig = field(default_factory=AwsConfig)
haproxy: HaproxyConfig = field(default_factory=HaproxyConfig)
capacity: CapacityConfig = field(default_factory=CapacityConfig)
security: SecurityConfig = field(default_factory=SecurityConfig)
scheduler: SchedulerConfig = field(default_factory=SchedulerConfig)
systems: list[SystemConfig] = field(default_factory=list)
# ---------------------------------------------------------------------------
# Environment variable overrides
# ---------------------------------------------------------------------------
# AUTOSCALER_TAILSCALE_API_TOKEN — Tailscale API token for IP discovery
# AWS_REGION — override aws.region
# AWS_ACCESS_KEY_ID — explicit AWS credential
# AWS_SECRET_ACCESS_KEY — explicit AWS credential
def _apply_env_overrides(cfg: AppConfig) -> None:
"""Apply environment variable overrides for secrets and region."""
region = os.environ.get("AWS_REGION")
if region:
cfg.aws.region = region
def _build_dataclass(cls: type, data: dict) -> object: # noqa: ANN001
"""Construct a dataclass from a dict, ignoring unknown keys."""
valid = {f.name for f in cls.__dataclass_fields__.values()} # type: ignore[attr-defined]
return cls(**{k: v for k, v in data.items() if k in valid})
def load_config(path: Path) -> AppConfig:
"""Load configuration from a TOML file.
Args:
path: Path to the TOML config file.
Returns:
Validated AppConfig instance.
"""
with open(path, "rb") as f:
raw = tomllib.load(f)
cfg = AppConfig()
if "server" in raw:
cfg.server = _build_dataclass(ServerConfig, raw["server"]) # type: ignore[assignment]
if "aws" in raw:
cfg.aws = _build_dataclass(AwsConfig, raw["aws"]) # type: ignore[assignment]
if "haproxy" in raw:
cfg.haproxy = _build_dataclass(HaproxyConfig, raw["haproxy"]) # type: ignore[assignment]
if "capacity" in raw:
cfg.capacity = _build_dataclass(CapacityConfig, raw["capacity"]) # type: ignore[assignment]
if "security" in raw:
cfg.security = _build_dataclass(SecurityConfig, raw["security"]) # type: ignore[assignment]
if "scheduler" in raw:
cfg.scheduler = _build_dataclass(SchedulerConfig, raw["scheduler"]) # type: ignore[assignment]
if "systems" in raw:
cfg.systems = list[SystemConfig](
_build_dataclass(SystemConfig, s) # type: ignore[list-item]
for s in raw["systems"]
)
_apply_env_overrides(cfg)
return cfg

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"""Structured JSON logging setup."""
from __future__ import annotations
import json
import logging
import sys
from datetime import UTC, datetime
from typing import Any
class JSONFormatter(logging.Formatter):
"""Format log records as single-line JSON."""
EXTRA_FIELDS = ("slot_id", "reservation_id", "instance_id", "request_id")
def format(self, record: logging.LogRecord) -> str:
"""Format a log record as JSON."""
entry: dict[str, Any] = {
"ts": datetime.now(UTC).isoformat(),
"level": record.levelname,
"logger": record.name,
"message": record.getMessage(),
}
for field in self.EXTRA_FIELDS:
val = getattr(record, field, None)
if val is not None:
entry[field] = val
if record.exc_info and record.exc_info[1] is not None:
entry["exception"] = self.formatException(record.exc_info)
return json.dumps(entry, default=str)
def setup_logging(level: str = "INFO") -> None:
"""Configure the root logger with JSON output to stderr.
Args:
level: Log level name (DEBUG, INFO, WARNING, ERROR).
"""
handler = logging.StreamHandler(sys.stderr)
handler.setFormatter(JSONFormatter())
root = logging.getLogger()
root.handlers.clear()
root.addHandler(handler)
root.setLevel(getattr(logging, level.upper(), logging.INFO))

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"""In-memory Prometheus metrics registry.
No prometheus_client dependency — formats text manually.
"""
from __future__ import annotations
import threading
from typing import Any
def _labels_key(labels: dict[str, str]) -> tuple[tuple[str, str], ...]:
return tuple(sorted(labels.items()))
def _format_labels(labels: dict[str, str]) -> str:
if not labels:
return ""
parts = ",".join(f'{k}="{v}"' for k, v in sorted(labels.items()))
return "{" + parts + "}"
class MetricsRegistry:
"""Thread-safe in-memory metrics store with Prometheus text output."""
def __init__(self) -> None:
self._lock = threading.Lock()
self._gauges: dict[str, dict[tuple[tuple[str, str], ...], float]] = {}
self._counters: dict[str, dict[tuple[tuple[str, str], ...], float]] = {}
self._histograms: dict[str, dict[tuple[tuple[str, str], ...], Any]] = {}
def gauge(self, name: str, labels: dict[str, str], value: float) -> None:
"""Set a gauge value."""
key = _labels_key(labels)
with self._lock:
if name not in self._gauges:
self._gauges[name] = {}
self._gauges[name][key] = value
def counter(self, name: str, labels: dict[str, str], increment: float = 1.0) -> None:
"""Increment a counter."""
key = _labels_key(labels)
with self._lock:
if name not in self._counters:
self._counters[name] = {}
self._counters[name][key] = self._counters[name].get(key, 0.0) + increment
def histogram_observe(self, name: str, labels: dict[str, str], value: float) -> None:
"""Record a histogram observation.
Uses fixed buckets: 0.01, 0.05, 0.1, 0.5, 1, 5, 10, 30, 60, 120, +Inf.
"""
key = _labels_key(labels)
buckets = (0.01, 0.05, 0.1, 0.5, 1.0, 5.0, 10.0, 30.0, 60.0, 120.0)
with self._lock:
if name not in self._histograms:
self._histograms[name] = {}
if key not in self._histograms[name]:
self._histograms[name][key] = {
"labels": labels,
"buckets": {b: 0 for b in buckets},
"sum": 0.0,
"count": 0,
}
entry = self._histograms[name][key]
entry["sum"] += value
entry["count"] += 1
for b in buckets:
if value <= b:
entry["buckets"][b] += 1
def render(self) -> str:
"""Render all metrics in Prometheus text exposition format."""
lines: list[str] = []
with self._lock:
for name, series in sorted(self._gauges.items()):
lines.append(f"# TYPE {name} gauge")
for key, val in sorted(series.items()):
labels = dict(key)
lines.append(f"{name}{_format_labels(labels)} {val}")
for name, series in sorted(self._counters.items()):
lines.append(f"# TYPE {name} counter")
for key, val in sorted(series.items()):
labels = dict(key)
lines.append(f"{name}{_format_labels(labels)} {val}")
for name, series in sorted(self._histograms.items()):
lines.append(f"# TYPE {name} histogram")
for _key, entry in sorted(series.items()):
labels = entry["labels"]
cumulative = 0
for b, count in sorted(entry["buckets"].items()):
cumulative += count
le_labels = {**labels, "le": str(b)}
lines.append(f"{name}_bucket{_format_labels(le_labels)} {cumulative}")
inf_labels = {**labels, "le": "+Inf"}
lines.append(f"{name}_bucket{_format_labels(inf_labels)} {entry['count']}")
lines.append(f"{name}_sum{_format_labels(labels)} {entry['sum']}")
lines.append(f"{name}_count{_format_labels(labels)} {entry['count']}")
lines.append("")
return "\n".join(lines)

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"""Data models for the autoscaler daemon."""
from __future__ import annotations
from datetime import datetime
from enum import StrEnum
from typing import Any
from pydantic import BaseModel, Field
class SlotState(StrEnum):
"""Exhaustive slot states."""
EMPTY = "empty"
LAUNCHING = "launching"
BOOTING = "booting"
BINDING = "binding"
READY = "ready"
DRAINING = "draining"
TERMINATING = "terminating"
ERROR = "error"
class ReservationPhase(StrEnum):
"""Exhaustive reservation phases."""
PENDING = "pending"
READY = "ready"
FAILED = "failed"
RELEASED = "released"
EXPIRED = "expired"
# ---------------------------------------------------------------------------
# API request models
# ---------------------------------------------------------------------------
class ReservationRequest(BaseModel):
"""POST /v1/reservations request body."""
system: str
reason: str
build_id: int | None = None
class CapacityHint(BaseModel):
"""POST /v1/hints/capacity request body."""
builder: str
queued: int
running: int
system: str
timestamp: datetime
# ---------------------------------------------------------------------------
# API response models
# ---------------------------------------------------------------------------
class ReservationResponse(BaseModel):
"""Reservation representation returned by the API."""
reservation_id: str
phase: ReservationPhase
slot: str | None = None
instance_id: str | None = None
system: str
created_at: datetime
updated_at: datetime
expires_at: datetime
released_at: datetime | None = None
class SlotInfo(BaseModel):
"""Slot representation returned by the API."""
slot_id: str
system: str
state: SlotState
instance_id: str | None = None
instance_ip: str | None = None
lease_count: int
last_state_change: datetime
class SlotsSummary(BaseModel):
"""Aggregate slot counts by state."""
total: int = 0
ready: int = 0
launching: int = 0
booting: int = 0
binding: int = 0
draining: int = 0
terminating: int = 0
empty: int = 0
error: int = 0
class ReservationsSummary(BaseModel):
"""Aggregate reservation counts by phase."""
pending: int = 0
ready: int = 0
failed: int = 0
class Ec2Summary(BaseModel):
"""EC2 subsystem health."""
api_ok: bool = True
last_reconcile_at: datetime | None = None
class HaproxySummary(BaseModel):
"""HAProxy subsystem health."""
socket_ok: bool = True
last_stat_poll_at: datetime | None = None
class StateSummary(BaseModel):
"""GET /v1/state/summary response."""
slots: SlotsSummary = Field(default_factory=SlotsSummary)
reservations: ReservationsSummary = Field(default_factory=ReservationsSummary)
ec2: Ec2Summary = Field(default_factory=Ec2Summary)
haproxy: HaproxySummary = Field(default_factory=HaproxySummary)
class ErrorDetail(BaseModel):
"""Structured error detail."""
code: str
message: str
retryable: bool = False
details: dict[str, Any] | None = None
class ErrorResponse(BaseModel):
"""Standard error response envelope."""
error: ErrorDetail
request_id: str
class HealthResponse(BaseModel):
"""Health check response."""
status: str

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"""Injectable clock abstraction for testability."""
from __future__ import annotations
from datetime import UTC, datetime, timedelta
from typing import Protocol
class Clock(Protocol):
"""Clock protocol — provides current UTC time."""
def now(self) -> datetime: ...
class SystemClock:
"""Real wall-clock implementation."""
def now(self) -> datetime:
"""Return the current UTC time."""
return datetime.now(UTC)
class FakeClock:
"""Deterministic clock for tests."""
def __init__(self, start: datetime | None = None) -> None:
self._now = start or datetime(2026, 1, 1, tzinfo=UTC)
def now(self) -> datetime:
"""Return the fixed current time."""
return self._now
def advance(self, seconds: float) -> None:
"""Advance the clock by the given number of seconds."""
self._now += timedelta(seconds=seconds)
def set(self, dt: datetime) -> None:
"""Set the clock to an exact time."""
self._now = dt

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"""HAProxy runtime socket adapter for managing builder slots."""
from __future__ import annotations
import csv
import io
import socket
from dataclasses import dataclass
class HAProxyError(Exception):
"""Error communicating with HAProxy runtime socket."""
@dataclass
class SlotHealth:
"""Health status for a single HAProxy server slot."""
status: str
scur: int
qcur: int
class HAProxyRuntime:
"""HAProxy runtime CLI adapter via Unix socket.
Communicates with HAProxy using the admin socket text protocol.
Args:
socket_path: Path to the HAProxy admin Unix socket.
backend: HAProxy backend name (e.g. "all").
slot_prefix: Server name prefix used for builder slots.
"""
def __init__(self, socket_path: str, backend: str, slot_prefix: str) -> None:
self._socket_path = socket_path
self._backend = backend
self._slot_prefix = slot_prefix
def set_slot_addr(self, slot_id: str, ip: str, port: int = 22) -> None:
"""Update server address for a slot."""
cmd = f"set server {self._backend}/{slot_id} addr {ip} port {port}"
resp = self._run(cmd)
self._check_response(resp, slot_id)
def enable_slot(self, slot_id: str) -> None:
"""Enable a server slot."""
cmd = f"enable server {self._backend}/{slot_id}"
resp = self._run(cmd)
self._check_response(resp, slot_id)
def disable_slot(self, slot_id: str) -> None:
"""Disable a server slot."""
cmd = f"disable server {self._backend}/{slot_id}"
resp = self._run(cmd)
self._check_response(resp, slot_id)
def slot_is_up(self, slot_id: str) -> bool:
"""Return True when HAProxy health status is UP for slot."""
health = self.read_slot_health()
entry = health.get(slot_id)
return entry is not None and entry.status == "UP"
def slot_session_count(self, slot_id: str) -> int:
"""Return current active session count for slot."""
health = self.read_slot_health()
entry = health.get(slot_id)
if entry is None:
raise HAProxyError(f"Slot not found in HAProxy stats: {slot_id}")
return entry.scur
def read_slot_health(self) -> dict[str, SlotHealth]:
"""Return full stats snapshot for all slots in the backend."""
raw = self._run("show stat")
reader = csv.DictReader(io.StringIO(raw))
result: dict[str, SlotHealth] = {}
for row in reader:
pxname = row.get("# pxname", "").strip()
svname = row.get("svname", "").strip()
if pxname == self._backend and svname.startswith(self._slot_prefix):
result[svname] = SlotHealth(
status=row.get("status", "").strip(),
scur=int(row.get("scur", "0")),
qcur=int(row.get("qcur", "0")),
)
return result
def _run(self, command: str) -> str:
"""Send a command to the HAProxy admin socket and return the response."""
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
try:
sock.connect(self._socket_path)
sock.sendall((command + "\n").encode())
sock.shutdown(socket.SHUT_WR)
chunks: list[bytes] = []
while True:
chunk = sock.recv(4096)
if not chunk:
break
chunks.append(chunk)
return b"".join(chunks).decode()
except FileNotFoundError as e:
raise HAProxyError(f"HAProxy socket not found: {self._socket_path}") from e
except ConnectionRefusedError as e:
raise HAProxyError(f"Connection refused to HAProxy socket: {self._socket_path}") from e
finally:
sock.close()
@staticmethod
def _check_response(response: str, slot_id: str) -> None:
"""Raise HAProxyError if the response indicates an error."""
stripped = response.strip()
if stripped.startswith(("No such", "Unknown")):
raise HAProxyError(f"HAProxy error for {slot_id}: {stripped}")

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"""Reconciler — advances slots through the state machine.
Each tick queries EC2 and HAProxy, then processes each slot according to
its current state: launching→booting→binding→ready, with draining and
terminating paths for teardown.
"""
from __future__ import annotations
import contextlib
import logging
import time
from datetime import datetime
from typing import TYPE_CHECKING
from .models import SlotState
from .providers.haproxy import HAProxyError
if TYPE_CHECKING:
from .config import AppConfig
from .metrics import MetricsRegistry
from .providers.clock import Clock
from .providers.haproxy import HAProxyRuntime
from .runtime.base import RuntimeAdapter
from .state_db import StateDB
log = logging.getLogger(__name__)
class Reconciler:
"""Advances slots through the state machine by polling EC2 and HAProxy.
Maintains binding health-check counters between ticks.
"""
def __init__(
self,
db: StateDB,
runtime: RuntimeAdapter,
haproxy: HAProxyRuntime,
config: AppConfig,
clock: Clock,
metrics: MetricsRegistry,
) -> None:
self._db = db
self._runtime = runtime
self._haproxy = haproxy
self._config = config
self._clock = clock
self._metrics = metrics
self._binding_up_counts: dict[str, int] = {}
def tick(self) -> None:
"""Execute one reconciliation tick."""
t0 = time.monotonic()
# 1. Query EC2
try:
managed = self._runtime.list_managed_instances()
except Exception:
log.exception("ec2_list_failed")
managed = []
ec2_by_slot: dict[str, dict] = {}
for inst in managed:
sid = inst.get("slot_id")
if sid:
ec2_by_slot[sid] = inst
# 2. Query HAProxy
try:
haproxy_health = self._haproxy_read_slot_health()
except HAProxyError:
log.warning("haproxy_stat_failed", exc_info=True)
haproxy_health = {}
# 3. Process each slot
all_slots = self._db.list_slots()
for slot in all_slots:
state = slot["state"]
if state == SlotState.LAUNCHING.value:
self._handle_launching(slot)
elif state == SlotState.BOOTING.value:
self._handle_booting(slot)
elif state == SlotState.BINDING.value:
self._handle_binding(slot, haproxy_health)
elif state == SlotState.READY.value:
self._handle_ready(slot, ec2_by_slot)
elif state == SlotState.DRAINING.value:
self._handle_draining(slot)
elif state == SlotState.TERMINATING.value:
self._handle_terminating(slot, ec2_by_slot)
# 4. Clean stale binding counters
binding_ids = {s["slot_id"] for s in all_slots if s["state"] == SlotState.BINDING.value}
stale = [k for k in self._binding_up_counts if k not in binding_ids]
for k in stale:
del self._binding_up_counts[k]
# 5. Emit metrics
tick_duration = time.monotonic() - t0
self._update_metrics(tick_duration)
def _handle_launching(self, slot: dict) -> None:
"""Check if launching instance has reached running state."""
instance_id = slot["instance_id"]
if not instance_id:
self._db.update_slot_state(slot["slot_id"], SlotState.ERROR)
return
info = self._runtime.describe_instance(instance_id)
ec2_state = info["state"]
if ec2_state == "running":
self._db.update_slot_state(slot["slot_id"], SlotState.BOOTING)
log.info("slot_booting", extra={"slot_id": slot["slot_id"]})
elif ec2_state in ("terminated", "shutting-down"):
self._db.update_slot_state(slot["slot_id"], SlotState.ERROR)
log.warning(
"slot_launch_terminated",
extra={"slot_id": slot["slot_id"], "ec2_state": ec2_state},
)
def _handle_booting(self, slot: dict) -> None:
"""Check if booting instance has a Tailscale IP yet."""
instance_id = slot["instance_id"]
if not instance_id:
self._db.update_slot_state(slot["slot_id"], SlotState.ERROR)
return
info = self._runtime.describe_instance(instance_id)
ec2_state = info["state"]
if ec2_state in ("terminated", "shutting-down"):
self._db.update_slot_state(slot["slot_id"], SlotState.ERROR)
log.warning(
"slot_boot_terminated",
extra={"slot_id": slot["slot_id"], "ec2_state": ec2_state},
)
return
tailscale_ip = info.get("tailscale_ip")
if tailscale_ip is not None:
self._db.update_slot_state(slot["slot_id"], SlotState.BINDING, instance_ip=tailscale_ip)
try:
self._haproxy_set_slot_addr(slot["slot_id"], tailscale_ip)
self._haproxy_enable_slot(slot["slot_id"])
except HAProxyError:
log.warning(
"haproxy_binding_setup_failed",
extra={"slot_id": slot["slot_id"]},
exc_info=True,
)
def _handle_binding(self, slot: dict, haproxy_health: dict) -> None:
"""Check HAProxy health to determine when slot is ready."""
slot_id = slot["slot_id"]
health = haproxy_health.get(slot_id)
if health is not None and health.status == "UP":
count = self._binding_up_counts.get(slot_id, 0) + 1
self._binding_up_counts[slot_id] = count
if count >= self._config.haproxy.check_ready_up_count:
self._db.update_slot_state(slot_id, SlotState.READY)
self._binding_up_counts.pop(slot_id, None)
log.info("slot_ready", extra={"slot_id": slot_id})
else:
self._binding_up_counts[slot_id] = 0
# Retry HAProxy setup
ip = slot.get("instance_ip")
if ip:
try:
self._haproxy_set_slot_addr(slot_id, ip)
self._haproxy_enable_slot(slot_id)
except HAProxyError:
pass
# Check if instance is still alive
instance_id = slot.get("instance_id")
if instance_id:
info = self._runtime.describe_instance(instance_id)
if info["state"] in ("terminated", "shutting-down"):
self._db.update_slot_state(slot_id, SlotState.ERROR)
self._binding_up_counts.pop(slot_id, None)
log.warning(
"slot_binding_terminated",
extra={"slot_id": slot_id},
)
def _handle_ready(self, slot: dict, ec2_by_slot: dict[str, dict]) -> None:
"""Verify EC2 instance is still alive for ready slots."""
slot_id = slot["slot_id"]
ec2_info = ec2_by_slot.get(slot_id)
if ec2_info is None or ec2_info["state"] == "terminated":
self._db.update_slot_state(slot_id, SlotState.ERROR, instance_id=None, instance_ip=None)
log.warning("slot_ready_instance_gone", extra={"slot_id": slot_id})
elif ec2_info["state"] == "shutting-down":
self._db.update_slot_fields(slot_id, interruption_pending=1)
log.info("slot_interruption_detected", extra={"slot_id": slot_id})
def _handle_draining(self, slot: dict) -> None:
"""Disable HAProxy and terminate when drain conditions are met."""
slot_id = slot["slot_id"]
# Disable HAProxy (idempotent)
with contextlib.suppress(HAProxyError):
self._haproxy_disable_slot(slot_id)
now = self._clock.now()
last_change = datetime.fromisoformat(slot["last_state_change"])
drain_duration = (now - last_change).total_seconds()
drain_timeout = self._config.capacity.drain_timeout_seconds
if slot["lease_count"] == 0 or drain_duration >= drain_timeout:
instance_id = slot.get("instance_id")
if instance_id:
try:
self._runtime.terminate_instance(instance_id)
self._metrics.counter(
"autoscaler_ec2_terminate_total",
{"result": "success"},
1.0,
)
except Exception:
self._metrics.counter(
"autoscaler_ec2_terminate_total",
{"result": "error"},
1.0,
)
log.warning(
"terminate_failed",
extra={"slot_id": slot_id, "instance_id": instance_id},
exc_info=True,
)
self._db.update_slot_state(slot_id, SlotState.TERMINATING)
log.info(
"slot_terminating",
extra={"slot_id": slot_id, "drain_duration": drain_duration},
)
def _handle_terminating(self, slot: dict, ec2_by_slot: dict[str, dict]) -> None:
"""Wait for EC2 to confirm termination, then reset slot to empty."""
slot_id = slot["slot_id"]
instance_id = slot.get("instance_id")
if not instance_id:
self._db.update_slot_state(
slot_id, SlotState.EMPTY, instance_id=None, instance_ip=None, lease_count=0
)
log.info("slot_emptied", extra={"slot_id": slot_id})
return
info = self._runtime.describe_instance(instance_id)
if info["state"] == "terminated":
self._db.update_slot_state(
slot_id, SlotState.EMPTY, instance_id=None, instance_ip=None, lease_count=0
)
log.info("slot_emptied", extra={"slot_id": slot_id})
def _update_metrics(self, tick_duration: float) -> None:
"""Emit reconciler metrics."""
summary = self._db.get_state_summary()
for state, count in summary["slots"].items():
self._metrics.gauge("autoscaler_slots_total", {"state": state}, float(count))
self._metrics.histogram_observe("autoscaler_reconcile_duration_seconds", {}, tick_duration)
def _haproxy_set_slot_addr(self, slot_id: str, ip: str) -> None:
try:
self._haproxy.set_slot_addr(slot_id, ip)
self._metrics.counter(
"autoscaler_haproxy_command_total",
{"cmd": "set_slot_addr", "result": "success"},
1.0,
)
except HAProxyError:
self._metrics.counter(
"autoscaler_haproxy_command_total",
{"cmd": "set_slot_addr", "result": "error"},
1.0,
)
raise
def _haproxy_enable_slot(self, slot_id: str) -> None:
try:
self._haproxy.enable_slot(slot_id)
self._metrics.counter(
"autoscaler_haproxy_command_total",
{"cmd": "enable_slot", "result": "success"},
1.0,
)
except HAProxyError:
self._metrics.counter(
"autoscaler_haproxy_command_total",
{"cmd": "enable_slot", "result": "error"},
1.0,
)
raise
def _haproxy_disable_slot(self, slot_id: str) -> None:
try:
self._haproxy.disable_slot(slot_id)
self._metrics.counter(
"autoscaler_haproxy_command_total",
{"cmd": "disable_slot", "result": "success"},
1.0,
)
except HAProxyError:
self._metrics.counter(
"autoscaler_haproxy_command_total",
{"cmd": "disable_slot", "result": "error"},
1.0,
)
raise
def _haproxy_read_slot_health(self) -> dict:
try:
health = self._haproxy.read_slot_health()
self._metrics.counter(
"autoscaler_haproxy_command_total",
{"cmd": "show_stat", "result": "success"},
1.0,
)
return health
except HAProxyError:
self._metrics.counter(
"autoscaler_haproxy_command_total",
{"cmd": "show_stat", "result": "error"},
1.0,
)
raise

0
agent/nix_builder_autoscaler/runtime/__init__.py Normal file
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"""Abstract base class for runtime adapters."""
from __future__ import annotations
from abc import ABC, abstractmethod
class RuntimeError(Exception):
"""Base error for runtime adapter failures.
Attributes:
category: Normalized error category for retry/classification logic.
"""
def __init__(self, message: str, category: str = "unknown") -> None:
super().__init__(message)
self.category = category
class RuntimeAdapter(ABC):
"""Interface for compute runtime backends (EC2, fake, etc.)."""
@abstractmethod
def launch_spot(self, slot_id: str, user_data: str) -> str:
"""Launch a spot instance for slot_id. Return instance_id."""
@abstractmethod
def describe_instance(self, instance_id: str) -> dict:
"""Return normalized instance info dict.
Keys: state, tailscale_ip (or None), launch_time.
"""
@abstractmethod
def terminate_instance(self, instance_id: str) -> None:
"""Terminate the instance."""
@abstractmethod
def list_managed_instances(self) -> list[dict]:
"""Return list of instances tagged ManagedBy=nix-builder-autoscaler.
Each entry has instance_id, state, slot_id (from AutoscalerSlot tag).
"""

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agent/nix_builder_autoscaler/runtime/ec2.py Normal file
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"""EC2 runtime adapter for managing Spot instances."""
from __future__ import annotations
import http.client
import json
import logging
import random
import socket
import time
from typing import Any
import boto3
from botocore.exceptions import ClientError
from ..config import AwsConfig
from .base import RuntimeAdapter
from .base import RuntimeError as RuntimeAdapterError
log = logging.getLogger(__name__)
# EC2 ClientError code → normalized error category
_ERROR_CATEGORIES: dict[str, str] = {
"InsufficientInstanceCapacity": "capacity_unavailable",
"SpotMaxPriceTooLow": "price_too_low",
"RequestLimitExceeded": "throttled",
}
_RETRYABLE_CODES: frozenset[str] = frozenset({"RequestLimitExceeded"})
class _UnixSocketHTTPConnection(http.client.HTTPConnection):
"""HTTP connection over a Unix domain socket."""
def __init__(self, socket_path: str, timeout: float = 1.0) -> None:
super().__init__("local-tailscaled.sock", timeout=timeout)
self._socket_path = socket_path
def connect(self) -> None:
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.sock.connect(self._socket_path)
class EC2Runtime(RuntimeAdapter):
"""EC2 Spot instance runtime adapter.
Args:
config: AWS configuration dataclass.
environment: Environment tag value (e.g. ``"dev"``, ``"prod"``).
_client: Optional pre-configured boto3 EC2 client (for testing).
"""
def __init__(
self,
config: AwsConfig,
environment: str = "dev",
*,
_client: Any = None,
_tailscale_socket_path: str = "/run/tailscale/tailscaled.sock",
) -> None:
self._client: Any = _client or boto3.client("ec2", region_name=config.region)
self._launch_template_id = config.launch_template_id
self._subnet_ids = list(config.subnet_ids)
self._security_group_ids = list(config.security_group_ids)
self._instance_profile_arn = config.instance_profile_arn
self._environment = environment
self._subnet_index = 0
self._tailscale_socket_path = _tailscale_socket_path
def launch_spot(self, slot_id: str, user_data: str) -> str:
"""Launch a spot instance for *slot_id*. Return instance ID."""
params: dict[str, Any] = {
"MinCount": 1,
"MaxCount": 1,
"LaunchTemplate": {
"LaunchTemplateId": self._launch_template_id,
"Version": "$Latest",
},
"InstanceMarketOptions": {
"MarketType": "spot",
"SpotOptions": {
"SpotInstanceType": "one-time",
"InstanceInterruptionBehavior": "terminate",
},
},
"UserData": user_data,
"TagSpecifications": [
{
"ResourceType": "instance",
"Tags": [
{"Key": "Name", "Value": f"nix-builder-{slot_id}"},
{"Key": "AutoscalerSlot", "Value": slot_id},
{"Key": "ManagedBy", "Value": "nix-builder-autoscaler"},
{"Key": "Service", "Value": "nix-builder"},
{"Key": "Environment", "Value": self._environment},
],
}
],
}
if self._subnet_ids:
subnet = self._subnet_ids[self._subnet_index % len(self._subnet_ids)]
self._subnet_index += 1
params["SubnetId"] = subnet
resp = self._call_with_backoff(self._client.run_instances, **params)
return resp["Instances"][0]["InstanceId"]
def describe_instance(self, instance_id: str) -> dict:
"""Return normalized instance info dict."""
try:
resp = self._call_with_backoff(
self._client.describe_instances, InstanceIds=[instance_id]
)
except RuntimeAdapterError:
return {"state": "terminated", "tailscale_ip": None, "launch_time": None}
reservations = resp.get("Reservations", [])
if not reservations or not reservations[0].get("Instances"):
return {"state": "terminated", "tailscale_ip": None, "launch_time": None}
inst = reservations[0]["Instances"][0]
tags = inst.get("Tags", [])
slot_id = self._get_tag(tags, "AutoscalerSlot")
state = inst["State"]["Name"]
tailscale_ip: str | None = None
if state == "running" and slot_id:
tailscale_ip = self._discover_tailscale_ip(slot_id, instance_id)
launch_time = inst.get("LaunchTime")
return {
"state": state,
"tailscale_ip": tailscale_ip,
"launch_time": launch_time.isoformat() if launch_time else None,
}
def terminate_instance(self, instance_id: str) -> None:
"""Terminate the instance."""
self._call_with_backoff(self._client.terminate_instances, InstanceIds=[instance_id])
def list_managed_instances(self) -> list[dict]:
"""Return list of managed instances."""
resp = self._call_with_backoff(
self._client.describe_instances,
Filters=[
{"Name": "tag:ManagedBy", "Values": ["nix-builder-autoscaler"]},
{
"Name": "instance-state-name",
"Values": ["pending", "running", "shutting-down", "stopping"],
},
],
)
result: list[dict] = []
for reservation in resp.get("Reservations", []):
for inst in reservation.get("Instances", []):
tags = inst.get("Tags", [])
result.append(
{
"instance_id": inst["InstanceId"],
"state": inst["State"]["Name"],
"slot_id": self._get_tag(tags, "AutoscalerSlot"),
}
)
return result
def _call_with_backoff(self, fn: Any, *args: Any, max_retries: int = 3, **kwargs: Any) -> Any:
"""Call *fn* with exponential backoff and full jitter on retryable errors."""
delay = 0.5
for attempt in range(max_retries + 1):
try:
return fn(*args, **kwargs)
except ClientError as e:
code = e.response["Error"]["Code"]
if code in _RETRYABLE_CODES and attempt < max_retries:
jitter = random.uniform(0, min(delay, 10.0))
time.sleep(jitter)
delay *= 2
log.warning(
"Retryable EC2 error (attempt %d/%d): %s",
attempt + 1,
max_retries,
code,
)
continue
category = _ERROR_CATEGORIES.get(code, "unknown")
raise RuntimeAdapterError(str(e), category=category) from e
# Unreachable — loop always returns or raises on every path
msg = "Retries exhausted"
raise RuntimeAdapterError(msg, category="unknown")
def _discover_tailscale_ip(self, slot_id: str, instance_id: str) -> str | None:
"""Resolve Tailscale IP for instance identity via local tailscaled LocalAPI."""
status = self._read_tailscale_status()
if status is None:
return None
peers_obj = status.get("Peer")
if not isinstance(peers_obj, dict):
return None
online_candidates: list[tuple[str, str]] = []
for peer in peers_obj.values():
if not isinstance(peer, dict):
continue
if not self._peer_is_online(peer):
continue
hostname = self._peer_hostname(peer)
if hostname is None:
continue
ip = self._peer_tailscale_ip(peer)
if ip is None:
continue
online_candidates.append((hostname, ip))
identity = f"nix-builder-{slot_id}-{instance_id}".lower()
identity_matches = [ip for host, ip in online_candidates if identity in host]
if len(identity_matches) == 1:
return identity_matches[0]
if len(identity_matches) > 1:
log.warning(
"tailscale_identity_ambiguous",
extra={"slot_id": slot_id, "instance_id": instance_id},
)
return None
slot_identity = f"nix-builder-{slot_id}".lower()
slot_matches = [ip for host, ip in online_candidates if slot_identity in host]
if len(slot_matches) == 1:
return slot_matches[0]
if len(slot_matches) > 1:
log.warning("tailscale_slot_ambiguous", extra={"slot_id": slot_id})
return None
return None
def _read_tailscale_status(self) -> dict[str, Any] | None:
"""Query local tailscaled LocalAPI status endpoint over Unix socket."""
conn = _UnixSocketHTTPConnection(self._tailscale_socket_path, timeout=1.0)
try:
conn.request(
"GET",
"/localapi/v0/status",
headers={"Host": "local-tailscaled.sock", "Accept": "application/json"},
)
response = conn.getresponse()
if response.status != 200:
return None
payload = response.read()
parsed = json.loads(payload.decode())
if isinstance(parsed, dict):
return parsed
return None
except (OSError, PermissionError, TimeoutError, json.JSONDecodeError, UnicodeDecodeError):
return None
except http.client.HTTPException:
return None
finally:
conn.close()
@staticmethod
def _peer_is_online(peer: dict[str, Any]) -> bool:
return bool(peer.get("Online") or peer.get("Active"))
@staticmethod
def _peer_hostname(peer: dict[str, Any]) -> str | None:
host = peer.get("HostName") or peer.get("DNSName")
if not isinstance(host, str) or not host:
return None
return host.strip(".").lower()
@staticmethod
def _peer_tailscale_ip(peer: dict[str, Any]) -> str | None:
ips = peer.get("TailscaleIPs")
if not isinstance(ips, list):
return None
ipv4 = [ip for ip in ips if isinstance(ip, str) and "." in ip]
if ipv4:
return ipv4[0]
for ip in ips:
if isinstance(ip, str) and ip:
return ip
return None
@staticmethod
def _get_tag(tags: list[dict[str, str]], key: str) -> str | None:
"""Extract a tag value from an EC2 tag list."""
for tag in tags:
if tag.get("Key") == key:
return tag.get("Value")
return None

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"""Fake runtime adapter for testing."""
from __future__ import annotations
import uuid
from dataclasses import dataclass
from .base import RuntimeAdapter
from .base import RuntimeError as RuntimeAdapterError
@dataclass
class _FakeInstance:
instance_id: str
slot_id: str
state: str = "pending"
tailscale_ip: str | None = None
launch_time: str = ""
ticks_to_running: int = 0
ticks_to_ip: int = 0
interrupted: bool = False
class FakeRuntime(RuntimeAdapter):
"""In-memory runtime adapter for deterministic testing.
Args:
launch_latency_ticks: Number of tick() calls before instance becomes running.
ip_delay_ticks: Additional ticks after running before tailscale_ip appears.
"""
def __init__(self, launch_latency_ticks: int = 2, ip_delay_ticks: int = 1) -> None:
self._launch_latency = launch_latency_ticks
self._ip_delay = ip_delay_ticks
self._instances: dict[str, _FakeInstance] = {}
self._launch_failures: set[str] = set()
self._interruptions: set[str] = set()
self._tick_count: int = 0
self._next_ip_counter: int = 1
def launch_spot(self, slot_id: str, user_data: str) -> str:
"""Launch a fake spot instance."""
if slot_id in self._launch_failures:
self._launch_failures.discard(slot_id)
raise RuntimeAdapterError(
f"Simulated launch failure for {slot_id}",
category="capacity_unavailable",
)
iid = f"i-fake-{uuid.uuid4().hex[:12]}"
self._instances[iid] = _FakeInstance(
instance_id=iid,
slot_id=slot_id,
state="pending",
launch_time=f"2026-01-01T00:00:{self._tick_count:02d}Z",
ticks_to_running=self._launch_latency,
ticks_to_ip=self._launch_latency + self._ip_delay,
)
return iid
def describe_instance(self, instance_id: str) -> dict:
"""Return normalized instance info."""
inst = self._instances.get(instance_id)
if inst is None:
return {"state": "terminated", "tailscale_ip": None, "launch_time": None}
if instance_id in self._interruptions:
self._interruptions.discard(instance_id)
inst.state = "terminated"
inst.interrupted = True
return {
"state": inst.state,
"tailscale_ip": inst.tailscale_ip,
"launch_time": inst.launch_time,
}
def terminate_instance(self, instance_id: str) -> None:
"""Terminate a fake instance."""
inst = self._instances.get(instance_id)
if inst is not None:
inst.state = "terminated"
def list_managed_instances(self) -> list[dict]:
"""List all non-terminated fake instances."""
result: list[dict] = []
for inst in self._instances.values():
if inst.state != "terminated":
result.append(
{
"instance_id": inst.instance_id,
"state": inst.state,
"slot_id": inst.slot_id,
}
)
return result
# -- Test helpers -------------------------------------------------------
def tick(self) -> None:
"""Advance internal tick counter and progress instance states."""
self._tick_count += 1
for inst in self._instances.values():
if inst.state == "terminated":
continue
if inst.state == "pending" and self._tick_count >= inst.ticks_to_running:
inst.state = "running"
if (
inst.state == "running"
and inst.tailscale_ip is None
and self._tick_count >= inst.ticks_to_ip
):
inst.tailscale_ip = f"100.64.0.{self._next_ip_counter}"
self._next_ip_counter += 1
def inject_launch_failure(self, slot_id: str) -> None:
"""Make the next launch_spot call for this slot_id raise an error."""
self._launch_failures.add(slot_id)
def inject_interruption(self, instance_id: str) -> None:
"""Make the next describe_instance call for this instance return terminated."""
self._interruptions.add(instance_id)

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"""Scheduler — stateless scheduling tick for the autoscaler.
Each tick: expire reservations, handle interruptions, assign pending
reservations to ready slots, launch new capacity, maintain warm pool
and min-slots, check idle scale-down, and emit metrics.
"""
from __future__ import annotations
import logging
import time
from datetime import datetime
from typing import TYPE_CHECKING
from .bootstrap.userdata import render_userdata
from .models import SlotState
from .runtime.base import RuntimeError as RuntimeAdapterError
if TYPE_CHECKING:
from .config import AppConfig
from .metrics import MetricsRegistry
from .providers.clock import Clock
from .runtime.base import RuntimeAdapter
from .state_db import StateDB
log = logging.getLogger(__name__)
def scheduling_tick(
db: StateDB,
runtime: RuntimeAdapter,
config: AppConfig,
clock: Clock,
metrics: MetricsRegistry,
) -> None:
"""Execute one scheduling tick.
All dependencies are passed as arguments — no global state.
"""
t0 = time.monotonic()
# 1. Expire old reservations
expired = db.expire_reservations(clock.now())
if expired:
log.info("expired_reservations", extra={"count": len(expired), "ids": expired})
# 2. Handle interruption-pending slots
_handle_interruptions(db)
# 3. Assign pending reservations to ready slots
_assign_reservations(db, config)
# 4. Launch new capacity for unmet demand
_launch_for_unmet_demand(db, runtime, config, metrics)
# 5. Ensure minimum slots and warm pool
_ensure_min_and_warm(db, runtime, config, metrics)
# 6. Check scale-down for idle slots
_check_idle_scale_down(db, config, clock)
# 7. Emit metrics
tick_duration = time.monotonic() - t0
_update_metrics(db, metrics, tick_duration)
def _handle_interruptions(db: StateDB) -> None:
"""Move ready slots with interruption_pending to draining."""
ready_slots = db.list_slots(SlotState.READY)
for slot in ready_slots:
if slot["interruption_pending"]:
db.update_slot_state(slot["slot_id"], SlotState.DRAINING, interruption_pending=0)
log.info(
"interruption_drain",
extra={"slot_id": slot["slot_id"]},
)
def _assign_reservations(db: StateDB, config: AppConfig) -> None:
"""Assign pending reservations to ready slots with capacity."""
from .models import ReservationPhase
pending = db.list_reservations(ReservationPhase.PENDING)
if not pending:
return
ready_slots = db.list_slots(SlotState.READY)
if not ready_slots:
return
max_leases = config.capacity.max_leases_per_slot
# Track in-memory capacity to prevent double-assignment within the same tick
capacity_map: dict[str, int] = {s["slot_id"]: s["lease_count"] for s in ready_slots}
for resv in pending:
system = resv["system"]
slot = _find_assignable_slot(ready_slots, system, max_leases, capacity_map)
if slot is None:
continue
db.assign_reservation(resv["reservation_id"], slot["slot_id"], slot["instance_id"])
capacity_map[slot["slot_id"]] += 1
log.info(
"reservation_assigned",
extra={
"reservation_id": resv["reservation_id"],
"slot_id": slot["slot_id"],
},
)
def _find_assignable_slot(
ready_slots: list[dict],
system: str,
max_leases: int,
capacity_map: dict[str, int],
) -> dict | None:
"""Return first ready slot for system with remaining capacity, or None."""
for slot in ready_slots:
if slot["system"] != system:
continue
sid = slot["slot_id"]
current: int = capacity_map[sid] if sid in capacity_map else slot["lease_count"]
if current < max_leases:
return slot
return None
def _count_active_slots(db: StateDB) -> int:
"""Count slots NOT in empty or error states."""
all_slots = db.list_slots()
return sum(
1 for s in all_slots if s["state"] not in (SlotState.EMPTY.value, SlotState.ERROR.value)
)
def _launch_for_unmet_demand(
db: StateDB,
runtime: RuntimeAdapter,
config: AppConfig,
metrics: MetricsRegistry,
) -> None:
"""Launch new capacity for pending reservations that couldn't be assigned."""
from .models import ReservationPhase
pending = db.list_reservations(ReservationPhase.PENDING)
if not pending:
return
active = _count_active_slots(db)
if active >= config.capacity.max_slots:
return
empty_slots = db.list_slots(SlotState.EMPTY)
if not empty_slots:
return
for launched, slot in enumerate(empty_slots):
if launched >= len(pending):
break
if active + launched >= config.capacity.max_slots:
break
_launch_slot(db, runtime, config, metrics, slot)
def _ensure_min_and_warm(
db: StateDB,
runtime: RuntimeAdapter,
config: AppConfig,
metrics: MetricsRegistry,
) -> None:
"""Ensure minimum slots and warm pool targets are met."""
active = _count_active_slots(db)
# Ensure min_slots
if active < config.capacity.min_slots:
needed = config.capacity.min_slots - active
empty_slots = db.list_slots(SlotState.EMPTY)
launched = 0
for slot in empty_slots:
if launched >= needed:
break
if active + launched >= config.capacity.max_slots:
break
_launch_slot(db, runtime, config, metrics, slot)
launched += 1
active += launched
# Ensure warm pool
if config.capacity.target_warm_slots > 0:
ready_idle = sum(1 for s in db.list_slots(SlotState.READY) if s["lease_count"] == 0)
pending_warm = (
len(db.list_slots(SlotState.LAUNCHING))
+ len(db.list_slots(SlotState.BOOTING))
+ len(db.list_slots(SlotState.BINDING))
)
warm_total = ready_idle + pending_warm
if warm_total < config.capacity.target_warm_slots:
needed = config.capacity.target_warm_slots - warm_total
empty_slots = db.list_slots(SlotState.EMPTY)
launched = 0
for slot in empty_slots:
if launched >= needed:
break
if active + launched >= config.capacity.max_slots:
break
_launch_slot(db, runtime, config, metrics, slot)
launched += 1
def _launch_slot(
db: StateDB,
runtime: RuntimeAdapter,
config: AppConfig,
metrics: MetricsRegistry,
slot: dict,
) -> None:
"""Launch a single slot. Transition to LAUNCHING on success, ERROR on failure."""
slot_id = slot["slot_id"]
user_data = render_userdata(slot_id, config.aws.region)
try:
instance_id = runtime.launch_spot(slot_id, user_data)
metrics.counter("autoscaler_ec2_launch_total", {"result": "success"}, 1.0)
db.update_slot_state(slot_id, SlotState.LAUNCHING, instance_id=instance_id)
log.info("slot_launched", extra={"slot_id": slot_id, "instance_id": instance_id})
except RuntimeAdapterError as exc:
metrics.counter("autoscaler_ec2_launch_total", {"result": exc.category}, 1.0)
db.update_slot_state(slot_id, SlotState.ERROR)
log.warning(
"slot_launch_failed",
extra={"slot_id": slot_id, "error": str(exc), "category": exc.category},
)
def _check_idle_scale_down(db: StateDB, config: AppConfig, clock: Clock) -> None:
"""Move idle ready slots to draining when idle threshold exceeded."""
ready_slots = db.list_slots(SlotState.READY)
now = clock.now()
active = _count_active_slots(db)
for slot in ready_slots:
if slot["lease_count"] != 0:
continue
last_change = datetime.fromisoformat(slot["last_state_change"])
idle_seconds = (now - last_change).total_seconds()
if idle_seconds > config.capacity.idle_scale_down_seconds:
if active <= config.capacity.min_slots:
continue
db.update_slot_state(slot["slot_id"], SlotState.DRAINING)
active -= 1
log.info(
"idle_scale_down",
extra={"slot_id": slot["slot_id"], "idle_seconds": idle_seconds},
)
def _update_metrics(db: StateDB, metrics: MetricsRegistry, tick_duration: float) -> None:
"""Refresh all gauge/counter/histogram values."""
summary = db.get_state_summary()
for state, count in summary["slots"].items():
metrics.gauge("autoscaler_slots_total", {"state": state}, float(count))
for phase, count in summary["reservations"].items():
metrics.gauge("autoscaler_reservations_total", {"phase": phase}, float(count))
metrics.histogram_observe("autoscaler_scheduler_tick_duration_seconds", {}, tick_duration)

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"""SQLite state persistence layer.
All write operations use BEGIN IMMEDIATE transactions for crash safety.
"""
from __future__ import annotations
import json
import sqlite3
import threading
import uuid
from datetime import UTC, datetime, timedelta
from pathlib import Path
from typing import TYPE_CHECKING
from .models import ReservationPhase, SlotState
if TYPE_CHECKING:
from .providers.clock import Clock
_SCHEMA = """
CREATE TABLE IF NOT EXISTS slots (
slot_id TEXT PRIMARY KEY,
system TEXT NOT NULL,
state TEXT NOT NULL,
instance_id TEXT,
instance_ip TEXT,
instance_launch_time TEXT,
bound_backend TEXT NOT NULL,
lease_count INTEGER NOT NULL DEFAULT 0,
last_state_change TEXT NOT NULL,
cooldown_until TEXT,
interruption_pending INTEGER NOT NULL DEFAULT 0
);
CREATE TABLE IF NOT EXISTS reservations (
reservation_id TEXT PRIMARY KEY,
system TEXT NOT NULL,
phase TEXT NOT NULL,
slot_id TEXT,
instance_id TEXT,
created_at TEXT NOT NULL,
updated_at TEXT NOT NULL,
expires_at TEXT NOT NULL,
released_at TEXT,
reason TEXT,
build_id INTEGER
);
CREATE TABLE IF NOT EXISTS events (
event_id INTEGER PRIMARY KEY AUTOINCREMENT,
ts TEXT NOT NULL,
kind TEXT NOT NULL,
payload_json TEXT NOT NULL
);
"""
def _now_iso(clock: Clock | None = None) -> str:
if clock is not None:
return clock.now().isoformat()
return datetime.now(UTC).isoformat()
def _row_to_dict(cursor: sqlite3.Cursor, row: tuple) -> dict: # type: ignore[type-arg]
"""Convert a sqlite3 row to a dict using column names."""
cols = [d[0] for d in cursor.description]
return dict(zip(cols, row, strict=False))
class StateDB:
"""SQLite-backed state store for slots, reservations, and events."""
def __init__(self, db_path: str | Path = ":memory:", clock: Clock | None = None) -> None:
self._conn = sqlite3.connect(str(db_path), check_same_thread=False)
self._conn.execute("PRAGMA journal_mode=WAL")
self._conn.execute("PRAGMA busy_timeout=5000")
self._clock = clock
self._lock = threading.RLock()
def init_schema(self) -> None:
"""Create tables if they don't exist."""
with self._lock:
self._conn.executescript(_SCHEMA)
def init_slots(self, slot_prefix: str, slot_count: int, system: str, backend: str) -> None:
"""Ensure all expected slots exist, creating missing ones as empty."""
with self._lock:
now = _now_iso(self._clock)
for i in range(1, slot_count + 1):
slot_id = f"{slot_prefix}{i:03d}"
bound = f"{backend}/{slot_id}"
self._conn.execute(
"""INSERT OR IGNORE INTO slots
(slot_id, system, state, bound_backend, lease_count, last_state_change)
VALUES (?, ?, ?, ?, 0, ?)""",
(slot_id, system, SlotState.EMPTY.value, bound, now),
)
self._conn.commit()
# -- Slot operations ----------------------------------------------------
def get_slot(self, slot_id: str) -> dict | None:
"""Return a slot row as dict, or None."""
with self._lock:
cur = self._conn.execute("SELECT * FROM slots WHERE slot_id = ?", (slot_id,))
row = cur.fetchone()
if row is None:
return None
return _row_to_dict(cur, row)
def list_slots(self, state: SlotState | None = None) -> list[dict]:
"""List slots, optionally filtered by state."""
with self._lock:
if state is not None:
cur = self._conn.execute(
"SELECT * FROM slots WHERE state = ? ORDER BY slot_id", (state.value,)
)
else:
cur = self._conn.execute("SELECT * FROM slots ORDER BY slot_id")
return [_row_to_dict(cur, row) for row in cur.fetchall()]
def update_slot_state(self, slot_id: str, new_state: SlotState, **fields: object) -> None:
"""Atomically transition a slot to a new state and record an event.
Additional fields (instance_id, instance_ip, etc.) can be passed as kwargs.
"""
with self._lock:
now = _now_iso(self._clock)
set_parts = ["state = ?", "last_state_change = ?"]
params: list[object] = [new_state.value, now]
allowed = {
"instance_id",
"instance_ip",
"instance_launch_time",
"lease_count",
"cooldown_until",
"interruption_pending",
}
for k, v in fields.items():
if k not in allowed:
msg = f"Unknown slot field: {k}"
raise ValueError(msg)
set_parts.append(f"{k} = ?")
params.append(v)
params.append(slot_id)
sql = f"UPDATE slots SET {', '.join(set_parts)} WHERE slot_id = ?"
self._conn.execute("BEGIN IMMEDIATE")
try:
self._conn.execute(sql, params)
self._record_event_inner(
"slot_state_change",
{"slot_id": slot_id, "new_state": new_state.value, **fields},
)
self._conn.execute("COMMIT")
except Exception:
self._conn.execute("ROLLBACK")
raise
def update_slot_fields(self, slot_id: str, **fields: object) -> None:
"""Update specific slot columns without changing state or last_state_change.
Uses BEGIN IMMEDIATE. Allowed fields: instance_id, instance_ip,
instance_launch_time, lease_count, cooldown_until, interruption_pending.
"""
with self._lock:
allowed = {
"instance_id",
"instance_ip",
"instance_launch_time",
"lease_count",
"cooldown_until",
"interruption_pending",
}
if not fields:
return
set_parts: list[str] = []
params: list[object] = []
for k, v in fields.items():
if k not in allowed:
msg = f"Unknown slot field: {k}"
raise ValueError(msg)
set_parts.append(f"{k} = ?")
params.append(v)
params.append(slot_id)
sql = f"UPDATE slots SET {', '.join(set_parts)} WHERE slot_id = ?"
self._conn.execute("BEGIN IMMEDIATE")
try:
self._conn.execute(sql, params)
self._record_event_inner(
"slot_fields_updated",
{"slot_id": slot_id, **fields},
)
self._conn.execute("COMMIT")
except Exception:
self._conn.execute("ROLLBACK")
raise
# -- Reservation operations ---------------------------------------------
def create_reservation(
self,
system: str,
reason: str,
build_id: int | None,
ttl_seconds: int,
) -> dict:
"""Create a new pending reservation. Returns the reservation row as dict."""
with self._lock:
now = _now_iso(self._clock)
if self._clock is not None:
expires = (self._clock.now() + timedelta(seconds=ttl_seconds)).isoformat()
else:
expires = (datetime.now(UTC) + timedelta(seconds=ttl_seconds)).isoformat()
rid = f"resv_{uuid.uuid4().hex}"
self._conn.execute("BEGIN IMMEDIATE")
try:
self._conn.execute(
"""INSERT INTO reservations
(reservation_id, system, phase, created_at, updated_at,
expires_at, reason, build_id)
VALUES (?, ?, ?, ?, ?, ?, ?, ?)""",
(
rid,
system,
ReservationPhase.PENDING.value,
now,
now,
expires,
reason,
build_id,
),
)
self._record_event_inner(
"reservation_created",
{"reservation_id": rid, "system": system, "reason": reason},
)
self._conn.execute("COMMIT")
except Exception:
self._conn.execute("ROLLBACK")
raise
return self.get_reservation(rid) # type: ignore[return-value]
def get_reservation(self, reservation_id: str) -> dict | None:
"""Return a reservation row as dict, or None."""
with self._lock:
cur = self._conn.execute(
"SELECT * FROM reservations WHERE reservation_id = ?", (reservation_id,)
)
row = cur.fetchone()
if row is None:
return None
return _row_to_dict(cur, row)
def list_reservations(self, phase: ReservationPhase | None = None) -> list[dict]:
"""List reservations, optionally filtered by phase."""
with self._lock:
if phase is not None:
cur = self._conn.execute(
"SELECT * FROM reservations WHERE phase = ? ORDER BY created_at",
(phase.value,),
)
else:
cur = self._conn.execute("SELECT * FROM reservations ORDER BY created_at")
return [_row_to_dict(cur, row) for row in cur.fetchall()]
def assign_reservation(self, reservation_id: str, slot_id: str, instance_id: str) -> None:
"""Assign a pending reservation to a ready slot.
Atomically: update reservation phase to ready, set slot_id/instance_id,
and increment slot lease_count.
"""
with self._lock:
now = _now_iso(self._clock)
self._conn.execute("BEGIN IMMEDIATE")
try:
self._conn.execute(
"""UPDATE reservations
SET phase = ?, slot_id = ?, instance_id = ?, updated_at = ?
WHERE reservation_id = ? AND phase = ?""",
(
ReservationPhase.READY.value,
slot_id,
instance_id,
now,
reservation_id,
ReservationPhase.PENDING.value,
),
)
self._conn.execute(
"UPDATE slots SET lease_count = lease_count + 1 WHERE slot_id = ?",
(slot_id,),
)
self._record_event_inner(
"reservation_assigned",
{
"reservation_id": reservation_id,
"slot_id": slot_id,
"instance_id": instance_id,
},
)
self._conn.execute("COMMIT")
except Exception:
self._conn.execute("ROLLBACK")
raise
def release_reservation(self, reservation_id: str) -> dict | None:
"""Release a reservation, decrementing the slot lease count."""
with self._lock:
now = _now_iso(self._clock)
self._conn.execute("BEGIN IMMEDIATE")
try:
cur = self._conn.execute(
"SELECT * FROM reservations WHERE reservation_id = ?",
(reservation_id,),
)
row = cur.fetchone()
if row is None:
self._conn.execute("ROLLBACK")
return None
resv = _row_to_dict(cur, row)
old_phase = resv["phase"]
if old_phase in (ReservationPhase.RELEASED.value, ReservationPhase.EXPIRED.value):
self._conn.execute("ROLLBACK")
return resv
self._conn.execute(
"""UPDATE reservations
SET phase = ?, released_at = ?, updated_at = ?
WHERE reservation_id = ?""",
(ReservationPhase.RELEASED.value, now, now, reservation_id),
)
if resv["slot_id"] and old_phase == ReservationPhase.READY.value:
self._conn.execute(
"""UPDATE slots SET lease_count = MAX(lease_count - 1, 0)
WHERE slot_id = ?""",
(resv["slot_id"],),
)
self._record_event_inner("reservation_released", {"reservation_id": reservation_id})
self._conn.execute("COMMIT")
except Exception:
self._conn.execute("ROLLBACK")
raise
return self.get_reservation(reservation_id)
def expire_reservations(self, now: datetime) -> list[str]:
"""Expire all reservations past their expires_at. Returns expired IDs."""
with self._lock:
now_iso = now.isoformat()
expired_ids: list[str] = []
self._conn.execute("BEGIN IMMEDIATE")
try:
cur = self._conn.execute(
"""SELECT reservation_id, slot_id, phase FROM reservations
WHERE phase IN (?, ?) AND expires_at <= ?""",
(ReservationPhase.PENDING.value, ReservationPhase.READY.value, now_iso),
)
rows = cur.fetchall()
for row in rows:
rid, slot_id, phase = row
expired_ids.append(rid)
self._conn.execute(
"""UPDATE reservations
SET phase = ?, updated_at = ?
WHERE reservation_id = ?""",
(ReservationPhase.EXPIRED.value, now_iso, rid),
)
if slot_id and phase == ReservationPhase.READY.value:
self._conn.execute(
"""UPDATE slots SET lease_count = MAX(lease_count - 1, 0)
WHERE slot_id = ?""",
(slot_id,),
)
self._record_event_inner("reservation_expired", {"reservation_id": rid})
self._conn.execute("COMMIT")
except Exception:
self._conn.execute("ROLLBACK")
raise
return expired_ids
# -- Events -------------------------------------------------------------
def record_event(self, kind: str, payload: dict) -> None: # type: ignore[type-arg]
"""Record an audit event."""
with self._lock:
self._conn.execute("BEGIN IMMEDIATE")
try:
self._record_event_inner(kind, payload)
self._conn.execute("COMMIT")
except Exception:
self._conn.execute("ROLLBACK")
raise
def _record_event_inner(self, kind: str, payload: dict) -> None: # type: ignore[type-arg]
"""Insert an event row (must be called inside an active transaction)."""
with self._lock:
now = _now_iso(self._clock)
self._conn.execute(
"INSERT INTO events (ts, kind, payload_json) VALUES (?, ?, ?)",
(now, kind, json.dumps(payload, default=str)),
)
# -- Summaries ----------------------------------------------------------
def get_state_summary(self) -> dict:
"""Return aggregate slot and reservation counts."""
with self._lock:
slot_counts: dict[str, int] = {}
cur = self._conn.execute("SELECT state, COUNT(*) FROM slots GROUP BY state")
for state_val, count in cur.fetchall():
slot_counts[state_val] = count
total_slots = sum(slot_counts.values())
resv_counts: dict[str, int] = {}
cur = self._conn.execute(
"SELECT phase, COUNT(*) FROM reservations WHERE phase IN (?, ?, ?) GROUP BY phase",
(
ReservationPhase.PENDING.value,
ReservationPhase.READY.value,
ReservationPhase.FAILED.value,
),
)
for phase_val, count in cur.fetchall():
resv_counts[phase_val] = count
return {
"slots": {
"total": total_slots,
"ready": slot_counts.get("ready", 0),
"launching": slot_counts.get("launching", 0),
"booting": slot_counts.get("booting", 0),
"binding": slot_counts.get("binding", 0),
"draining": slot_counts.get("draining", 0),
"terminating": slot_counts.get("terminating", 0),
"empty": slot_counts.get("empty", 0),
"error": slot_counts.get("error", 0),
},
"reservations": {
"pending": resv_counts.get("pending", 0),
"ready": resv_counts.get("ready", 0),
"failed": resv_counts.get("failed", 0),
},
}
def close(self) -> None:
"""Close the database connection."""
with self._lock:
self._conn.close()

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"""End-to-end integration tests with FakeRuntime and a fake HAProxy socket."""
from __future__ import annotations
import socket
import threading
import time
from pathlib import Path
from fastapi.testclient import TestClient
from nix_builder_autoscaler.api import create_app
from nix_builder_autoscaler.config import (
AppConfig,
AwsConfig,
CapacityConfig,
HaproxyConfig,
SchedulerConfig,
)
from nix_builder_autoscaler.metrics import MetricsRegistry
from nix_builder_autoscaler.models import SlotState
from nix_builder_autoscaler.providers.clock import FakeClock
from nix_builder_autoscaler.providers.haproxy import HAProxyRuntime
from nix_builder_autoscaler.reconciler import Reconciler
from nix_builder_autoscaler.runtime.fake import FakeRuntime
from nix_builder_autoscaler.scheduler import scheduling_tick
from nix_builder_autoscaler.state_db import StateDB
class FakeHAProxySocketServer:
"""Tiny fake HAProxy runtime socket server for integration tests."""
def __init__(self, socket_path: Path, backend: str, slot_ids: list[str]) -> None:
self._socket_path = socket_path
self._backend = backend
self._slot_ids = slot_ids
self._stop_event = threading.Event()
self._thread: threading.Thread | None = None
self._lock = threading.Lock()
self._state: dict[str, dict[str, object]] = {
slot_id: {
"enabled": False,
"addr": "0.0.0.0",
"port": 22,
"status": "MAINT",
"scur": 0,
"qcur": 0,
}
for slot_id in slot_ids
}
def start(self) -> None:
self._thread = threading.Thread(target=self._serve, name="fake-haproxy", daemon=True)
self._thread.start()
deadline = time.time() + 2.0
while time.time() < deadline:
if self._socket_path.exists():
return
time.sleep(0.01)
msg = f"fake haproxy socket not created: {self._socket_path}"
raise RuntimeError(msg)
def stop(self) -> None:
self._stop_event.set()
try:
with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as sock:
sock.connect(str(self._socket_path))
sock.sendall(b"\n")
except OSError:
pass
if self._thread is not None:
self._thread.join(timeout=2.0)
if self._socket_path.exists():
self._socket_path.unlink()
def _serve(self) -> None:
if self._socket_path.exists():
self._socket_path.unlink()
with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as server:
server.bind(str(self._socket_path))
server.listen(16)
server.settimeout(0.2)
while not self._stop_event.is_set():
try:
conn, _ = server.accept()
except TimeoutError:
continue
except OSError:
if self._stop_event.is_set():
break
continue
with conn:
payload = b""
while True:
chunk = conn.recv(4096)
if not chunk:
break
payload += chunk
command = payload.decode().strip()
response = self._handle_command(command)
try:
conn.sendall(response.encode())
except BrokenPipeError:
continue
def _handle_command(self, command: str) -> str:
if command == "show stat":
return self._render_show_stat()
parts = command.split()
if not parts:
return "\n"
if parts[0:2] == ["set", "server"] and len(parts) >= 7:
slot_id = self._parse_slot(parts[2])
if slot_id is None:
return "No such server.\n"
with self._lock:
slot_state = self._state[slot_id]
slot_state["addr"] = parts[4]
slot_state["port"] = int(parts[6])
slot_state["status"] = "UP" if slot_state["enabled"] else "DOWN"
return "\n"
if parts[0:2] == ["enable", "server"] and len(parts) >= 3:
slot_id = self._parse_slot(parts[2])
if slot_id is None:
return "No such server.\n"
with self._lock:
slot_state = self._state[slot_id]
slot_state["enabled"] = True
slot_state["status"] = "UP"
return "\n"
if parts[0:2] == ["disable", "server"] and len(parts) >= 3:
slot_id = self._parse_slot(parts[2])
if slot_id is None:
return "No such server.\n"
with self._lock:
slot_state = self._state[slot_id]
slot_state["enabled"] = False
slot_state["status"] = "MAINT"
return "\n"
return "Unknown command.\n"
def _parse_slot(self, backend_slot: str) -> str | None:
backend, _, slot_id = backend_slot.partition("/")
if backend != self._backend or slot_id not in self._state:
return None
return slot_id
def _render_show_stat(self) -> str:
header = "# pxname,svname,qcur,qmax,scur,smax,slim,stot,status\n"
rows = [f"{self._backend},BACKEND,0,0,0,0,0,0,UP\n"]
with self._lock:
for slot_id in self._slot_ids:
slot_state = self._state[slot_id]
rows.append(
f"{self._backend},{slot_id},{slot_state['qcur']},0,"
f"{slot_state['scur']},0,50,0,{slot_state['status']}\n"
)
return header + "".join(rows)
class DaemonHarness:
"""In-process threaded harness for scheduler/reconciler/API integration."""
def __init__(
self,
root: Path,
*,
db_path: Path | None = None,
runtime: FakeRuntime | None = None,
max_slots: int = 3,
min_slots: int = 0,
idle_scale_down_seconds: int = 1,
drain_timeout_seconds: int = 120,
) -> None:
root.mkdir(parents=True, exist_ok=True)
self.clock = FakeClock()
self.metrics = MetricsRegistry()
self.runtime = runtime or FakeRuntime(launch_latency_ticks=2, ip_delay_ticks=1)
self._stop_event = threading.Event()
self._threads: list[threading.Thread] = []
self._reconcile_lock = threading.Lock()
self._db_path = db_path or (root / "state.db")
self._socket_path = root / "haproxy.sock"
self._slot_ids = [f"slot{i:03d}" for i in range(1, 4)]
self.config = AppConfig(
aws=AwsConfig(region="us-east-1"),
haproxy=HaproxyConfig(
runtime_socket=str(self._socket_path),
backend="all",
slot_prefix="slot",
slot_count=3,
check_ready_up_count=1,
),
capacity=CapacityConfig(
default_system="x86_64-linux",
max_slots=max_slots,
min_slots=min_slots,
max_leases_per_slot=1,
target_warm_slots=0,
reservation_ttl_seconds=1200,
idle_scale_down_seconds=idle_scale_down_seconds,
drain_timeout_seconds=drain_timeout_seconds,
),
scheduler=SchedulerConfig(tick_seconds=0.05, reconcile_seconds=0.05),
)
self.db = StateDB(str(self._db_path), clock=self.clock)
self.db.init_schema()
self.db.init_slots("slot", 3, "x86_64-linux", "all")
self.haproxy_server = FakeHAProxySocketServer(self._socket_path, "all", self._slot_ids)
self.haproxy = HAProxyRuntime(str(self._socket_path), "all", "slot")
self.reconciler = Reconciler(
self.db,
self.runtime,
self.haproxy,
self.config,
self.clock,
self.metrics,
)
app = create_app(
self.db,
self.config,
self.clock,
self.metrics,
reconcile_now=self.reconcile_now,
)
self.client = TestClient(app)
def start(self) -> None:
self.haproxy_server.start()
with self._reconcile_lock:
self.runtime.tick()
self.reconciler.tick()
self._threads = [
threading.Thread(target=self._scheduler_loop, name="sched", daemon=True),
threading.Thread(target=self._reconciler_loop, name="recon", daemon=True),
]
for thread in self._threads:
thread.start()
def stop(self) -> None:
self._stop_event.set()
for thread in self._threads:
thread.join(timeout=2.0)
self.client.close()
self.haproxy_server.stop()
self.db.close()
def create_reservation(self, reason: str) -> str:
response = self.client.post(
"/v1/reservations",
json={"system": "x86_64-linux", "reason": reason},
)
assert response.status_code == 200
return str(response.json()["reservation_id"])
def release_reservation(self, reservation_id: str) -> None:
response = self.client.post(f"/v1/reservations/{reservation_id}/release")
assert response.status_code == 200
def reservation(self, reservation_id: str) -> dict:
response = self.client.get(f"/v1/reservations/{reservation_id}")
assert response.status_code == 200
return response.json()
def wait_for(self, predicate, timeout: float = 6.0) -> None: # noqa: ANN001
deadline = time.time() + timeout
while time.time() < deadline:
if predicate():
return
time.sleep(0.02)
raise AssertionError("condition not met before timeout")
def reconcile_now(self) -> dict[str, bool]:
with self._reconcile_lock:
self.runtime.tick()
self.reconciler.tick()
return {"triggered": True}
def _scheduler_loop(self) -> None:
while not self._stop_event.is_set():
scheduling_tick(self.db, self.runtime, self.config, self.clock, self.metrics)
self._stop_event.wait(self.config.scheduler.tick_seconds)
def _reconciler_loop(self) -> None:
while not self._stop_event.is_set():
with self._reconcile_lock:
self.runtime.tick()
self.reconciler.tick()
self._stop_event.wait(self.config.scheduler.reconcile_seconds)
def test_cold_start_reservation_launch_bind_ready(tmp_path: Path) -> None:
harness = DaemonHarness(tmp_path)
harness.start()
try:
reservation_id = harness.create_reservation("cold-start")
harness.wait_for(lambda: harness.reservation(reservation_id)["phase"] == "ready")
reservation = harness.reservation(reservation_id)
assert reservation["slot"] is not None
slot = harness.db.get_slot(reservation["slot"])
assert slot is not None
assert slot["state"] == SlotState.READY.value
assert slot["instance_ip"] is not None
finally:
harness.stop()
def test_burst_three_concurrent_reservations(tmp_path: Path) -> None:
harness = DaemonHarness(tmp_path, max_slots=3)
harness.start()
try:
reservation_ids = [harness.create_reservation(f"burst-{i}") for i in range(3)]
harness.wait_for(
lambda: all(harness.reservation(rid)["phase"] == "ready" for rid in reservation_ids),
timeout=8.0,
)
slots = [harness.reservation(rid)["slot"] for rid in reservation_ids]
assert len(set(slots)) == 3
finally:
harness.stop()
def test_scale_down_after_release_and_idle_timeout(tmp_path: Path) -> None:
harness = DaemonHarness(tmp_path, idle_scale_down_seconds=1, drain_timeout_seconds=0)
harness.start()
try:
reservation_id = harness.create_reservation("scale-down")
harness.wait_for(lambda: harness.reservation(reservation_id)["phase"] == "ready")
slot_id = str(harness.reservation(reservation_id)["slot"])
harness.release_reservation(reservation_id)
harness.clock.advance(2)
harness.wait_for(
lambda: (
harness.db.get_slot(slot_id) is not None
and harness.db.get_slot(slot_id)["state"] == SlotState.EMPTY.value
)
)
finally:
harness.stop()
def test_restart_recovery_midflight(tmp_path: Path) -> None:
db_path = tmp_path / "state.db"
runtime = FakeRuntime(launch_latency_ticks=6, ip_delay_ticks=2)
first = DaemonHarness(tmp_path / "run1", db_path=db_path, runtime=runtime)
first.start()
reservation_id = first.create_reservation("restart-midflight")
first.wait_for(
lambda: len(first.db.list_slots(SlotState.LAUNCHING)) > 0,
timeout=4.0,
)
first.stop()
second = DaemonHarness(tmp_path / "run2", db_path=db_path, runtime=runtime)
second.start()
try:
second.wait_for(lambda: second.reservation(reservation_id)["phase"] == "ready", timeout=8.0)
finally:
second.stop()
def test_interruption_recovery_pending_reservation_resolves(tmp_path: Path) -> None:
harness = DaemonHarness(tmp_path, max_slots=2, idle_scale_down_seconds=60)
harness.start()
try:
first_reservation = harness.create_reservation("baseline")
harness.wait_for(lambda: harness.reservation(first_reservation)["phase"] == "ready")
slot_id = str(harness.reservation(first_reservation)["slot"])
instance_id = str(harness.reservation(first_reservation)["instance_id"])
second_reservation = harness.create_reservation("post-interruption")
harness.release_reservation(first_reservation)
harness.runtime.inject_interruption(instance_id)
harness.runtime._instances[instance_id].state = "shutting-down"
harness.wait_for(
lambda: (
harness.db.get_slot(slot_id) is not None
and harness.db.get_slot(slot_id)["state"]
in {
SlotState.DRAINING.value,
SlotState.TERMINATING.value,
SlotState.EMPTY.value,
}
),
timeout=6.0,
)
harness.wait_for(
lambda: harness.reservation(second_reservation)["phase"] == "ready",
timeout=10.0,
)
finally:
harness.stop()

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"""Unit tests for the HAProxy provider, mocking at socket level."""
from unittest.mock import MagicMock, patch
import pytest
from nix_builder_autoscaler.providers.haproxy import HAProxyError, HAProxyRuntime
# HAProxy `show stat` CSV — trimmed to columns the parser uses.
# Full output has many more columns; we keep through `status` (col 17).
SHOW_STAT_CSV = (
"# pxname,svname,qcur,qmax,scur,smax,slim,stot,"
"bin,bout,dreq,dresp,ereq,econ,eresp,wretr,wredis,status\n"
"all,BACKEND,0,0,2,5,200,100,5000,6000,0,0,,0,0,0,0,UP\n"
"all,slot001,0,0,1,3,50,50,2500,3000,0,0,,0,0,0,0,UP\n"
"all,slot002,0,0,1,2,50,50,2500,3000,0,0,,0,0,0,0,DOWN\n"
"all,slot003,0,0,0,0,50,0,0,0,0,0,,0,0,0,0,MAINT\n"
)
class TestSetSlotAddr:
@patch("nix_builder_autoscaler.providers.haproxy.socket.socket")
def test_sends_correct_command(self, mock_socket_cls):
mock_sock = MagicMock()
mock_socket_cls.return_value = mock_sock
mock_sock.recv.side_effect = [b"\n", b""]
h = HAProxyRuntime("/tmp/test.sock", "all", "slot")
h.set_slot_addr("slot001", "100.64.0.1", 22)
mock_sock.connect.assert_called_once_with("/tmp/test.sock")
mock_sock.sendall.assert_called_once_with(
b"set server all/slot001 addr 100.64.0.1 port 22\n"
)
class TestEnableSlot:
@patch("nix_builder_autoscaler.providers.haproxy.socket.socket")
def test_sends_correct_command(self, mock_socket_cls):
mock_sock = MagicMock()
mock_socket_cls.return_value = mock_sock
mock_sock.recv.side_effect = [b"\n", b""]
h = HAProxyRuntime("/tmp/test.sock", "all", "slot")
h.enable_slot("slot001")
mock_sock.sendall.assert_called_once_with(b"enable server all/slot001\n")
class TestDisableSlot:
@patch("nix_builder_autoscaler.providers.haproxy.socket.socket")
def test_sends_correct_command(self, mock_socket_cls):
mock_sock = MagicMock()
mock_socket_cls.return_value = mock_sock
mock_sock.recv.side_effect = [b"\n", b""]
h = HAProxyRuntime("/tmp/test.sock", "all", "slot")
h.disable_slot("slot001")
mock_sock.sendall.assert_called_once_with(b"disable server all/slot001\n")
class TestReadSlotHealth:
@patch("nix_builder_autoscaler.providers.haproxy.socket.socket")
def test_parses_csv_correctly(self, mock_socket_cls):
mock_sock = MagicMock()
mock_socket_cls.return_value = mock_sock
mock_sock.recv.side_effect = [SHOW_STAT_CSV.encode(), b""]
h = HAProxyRuntime("/tmp/test.sock", "all", "slot")
health = h.read_slot_health()
assert len(health) == 3
# BACKEND row should be excluded (svname "BACKEND" doesn't start with "slot")
assert health["slot001"].status == "UP"
assert health["slot001"].scur == 1
assert health["slot001"].qcur == 0
assert health["slot002"].status == "DOWN"
assert health["slot002"].scur == 1
assert health["slot002"].qcur == 0
assert health["slot003"].status == "MAINT"
assert health["slot003"].scur == 0
assert health["slot003"].qcur == 0
class TestSlotIsUp:
@patch("nix_builder_autoscaler.providers.haproxy.socket.socket")
def test_returns_true_for_up_slot(self, mock_socket_cls):
mock_sock = MagicMock()
mock_socket_cls.return_value = mock_sock
mock_sock.recv.side_effect = [SHOW_STAT_CSV.encode(), b""]
h = HAProxyRuntime("/tmp/test.sock", "all", "slot")
assert h.slot_is_up("slot001") is True
@patch("nix_builder_autoscaler.providers.haproxy.socket.socket")
def test_returns_false_for_down_slot(self, mock_socket_cls):
mock_sock = MagicMock()
mock_socket_cls.return_value = mock_sock
mock_sock.recv.side_effect = [SHOW_STAT_CSV.encode(), b""]
h = HAProxyRuntime("/tmp/test.sock", "all", "slot")
assert h.slot_is_up("slot002") is False
class TestErrorHandling:
@patch("nix_builder_autoscaler.providers.haproxy.socket.socket")
def test_unrecognized_slot_raises_haproxy_error(self, mock_socket_cls):
mock_sock = MagicMock()
mock_socket_cls.return_value = mock_sock
mock_sock.recv.side_effect = [b"No such server.\n", b""]
h = HAProxyRuntime("/tmp/test.sock", "all", "slot")
with pytest.raises(HAProxyError, match="No such server"):
h.set_slot_addr("slot999", "100.64.0.1")
@patch("nix_builder_autoscaler.providers.haproxy.socket.socket")
def test_socket_not_found_raises_haproxy_error(self, mock_socket_cls):
mock_sock = MagicMock()
mock_socket_cls.return_value = mock_sock
mock_sock.connect.side_effect = FileNotFoundError("No such file")
h = HAProxyRuntime("/tmp/nonexistent.sock", "all", "slot")
with pytest.raises(HAProxyError, match="socket not found"):
h.set_slot_addr("slot001", "100.64.0.1")
@patch("nix_builder_autoscaler.providers.haproxy.socket.socket")
def test_connection_refused_raises_haproxy_error(self, mock_socket_cls):
mock_sock = MagicMock()
mock_socket_cls.return_value = mock_sock
mock_sock.connect.side_effect = ConnectionRefusedError("Connection refused")
h = HAProxyRuntime("/tmp/test.sock", "all", "slot")
with pytest.raises(HAProxyError, match="Connection refused"):
h.enable_slot("slot001")
@patch("nix_builder_autoscaler.providers.haproxy.socket.socket")
def test_slot_session_count_missing_slot_raises(self, mock_socket_cls):
mock_sock = MagicMock()
mock_socket_cls.return_value = mock_sock
mock_sock.recv.side_effect = [SHOW_STAT_CSV.encode(), b""]
h = HAProxyRuntime("/tmp/test.sock", "all", "slot")
with pytest.raises(HAProxyError, match="Slot not found"):
h.slot_session_count("slot_nonexistent")

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"""Reservations API unit tests."""
from __future__ import annotations
from datetime import UTC, datetime
from typing import Any
from fastapi.testclient import TestClient
from nix_builder_autoscaler.api import create_app
from nix_builder_autoscaler.config import AppConfig, CapacityConfig
from nix_builder_autoscaler.metrics import MetricsRegistry
from nix_builder_autoscaler.models import SlotState
from nix_builder_autoscaler.providers.clock import FakeClock
from nix_builder_autoscaler.state_db import StateDB
def _make_client(
*,
reconcile_now: Any = None, # noqa: ANN401
) -> tuple[TestClient, StateDB, FakeClock, MetricsRegistry]:
clock = FakeClock()
db = StateDB(":memory:", clock=clock)
db.init_schema()
db.init_slots("slot", 3, "x86_64-linux", "all")
config = AppConfig(capacity=CapacityConfig(reservation_ttl_seconds=1200))
metrics = MetricsRegistry()
app = create_app(db, config, clock, metrics, reconcile_now=reconcile_now)
return TestClient(app), db, clock, metrics
def test_create_reservation_returns_200() -> None:
client, _, _, _ = _make_client()
response = client.post("/v1/reservations", json={"system": "x86_64-linux", "reason": "test"})
assert response.status_code == 200
body = response.json()
assert body["reservation_id"].startswith("resv_")
assert body["phase"] == "pending"
assert body["system"] == "x86_64-linux"
assert "created_at" in body
assert "expires_at" in body
def test_get_reservation_returns_current_phase() -> None:
client, _, _, _ = _make_client()
created = client.post("/v1/reservations", json={"system": "x86_64-linux", "reason": "test"})
reservation_id = created.json()["reservation_id"]
response = client.get(f"/v1/reservations/{reservation_id}")
assert response.status_code == 200
assert response.json()["phase"] == "pending"
def test_release_reservation_moves_to_released() -> None:
client, _, _, _ = _make_client()
created = client.post("/v1/reservations", json={"system": "x86_64-linux", "reason": "test"})
reservation_id = created.json()["reservation_id"]
response = client.post(f"/v1/reservations/{reservation_id}/release")
assert response.status_code == 200
assert response.json()["phase"] == "released"
def test_unknown_reservation_returns_404() -> None:
client, _, _, _ = _make_client()
response = client.get("/v1/reservations/resv_nonexistent")
assert response.status_code == 404
body = response.json()
assert body["error"]["code"] == "not_found"
assert "request_id" in body
def test_malformed_body_returns_422() -> None:
client, _, _, _ = _make_client()
response = client.post("/v1/reservations", json={"invalid": "data"})
assert response.status_code == 422
def test_list_reservations_returns_all() -> None:
client, _, _, _ = _make_client()
client.post("/v1/reservations", json={"system": "x86_64-linux", "reason": "a"})
client.post("/v1/reservations", json={"system": "x86_64-linux", "reason": "b"})
response = client.get("/v1/reservations")
assert response.status_code == 200
assert len(response.json()) == 2
def test_list_reservations_filters_by_phase() -> None:
client, _, _, _ = _make_client()
created = client.post("/v1/reservations", json={"system": "x86_64-linux", "reason": "test"})
reservation_id = created.json()["reservation_id"]
client.post(f"/v1/reservations/{reservation_id}/release")
response = client.get("/v1/reservations?phase=released")
assert response.status_code == 200
body = response.json()
assert len(body) == 1
assert body[0]["phase"] == "released"
def test_list_slots_returns_all_slots() -> None:
client, _, _, _ = _make_client()
response = client.get("/v1/slots")
assert response.status_code == 200
assert len(response.json()) == 3
def test_state_summary_returns_counts() -> None:
client, _, _, _ = _make_client()
response = client.get("/v1/state/summary")
assert response.status_code == 200
body = response.json()
assert body["slots"]["total"] == 3
assert body["slots"]["empty"] == 3
def test_health_live_returns_ok() -> None:
client, _, _, _ = _make_client()
response = client.get("/health/live")
assert response.status_code == 200
assert response.json()["status"] == "ok"
def test_health_ready_returns_ok_when_no_checks() -> None:
client, _, _, _ = _make_client()
response = client.get("/health/ready")
assert response.status_code == 200
assert response.json()["status"] == "ok"
def test_health_ready_degraded_when_ready_check_fails() -> None:
clock = FakeClock()
db = StateDB(":memory:", clock=clock)
db.init_schema()
db.init_slots("slot", 3, "x86_64-linux", "all")
config = AppConfig(capacity=CapacityConfig(reservation_ttl_seconds=1200))
metrics = MetricsRegistry()
app = create_app(db, config, clock, metrics, ready_check=lambda: False)
client = TestClient(app)
response = client.get("/health/ready")
assert response.status_code == 503
assert response.json()["status"] == "degraded"
def test_metrics_returns_prometheus_text() -> None:
client, _, _, metrics = _make_client()
metrics.counter("autoscaler_test_counter", {}, 1.0)
response = client.get("/metrics")
assert response.status_code == 200
assert "text/plain" in response.headers["content-type"]
assert "autoscaler_test_counter" in response.text
def test_capacity_hint_accepted() -> None:
client, _, _, _ = _make_client()
response = client.post(
"/v1/hints/capacity",
json={
"builder": "buildbot",
"queued": 2,
"running": 4,
"system": "x86_64-linux",
"timestamp": datetime(2026, 1, 1, tzinfo=UTC).isoformat(),
},
)
assert response.status_code == 200
assert response.json()["status"] == "accepted"
def test_release_nonexistent_returns_404() -> None:
client, _, _, _ = _make_client()
response = client.post("/v1/reservations/resv_nonexistent/release")
assert response.status_code == 404
assert response.json()["error"]["code"] == "not_found"
def test_admin_drain_success() -> None:
client, db, _, _ = _make_client()
db.update_slot_state("slot001", SlotState.LAUNCHING, instance_id="i-test")
db.update_slot_state("slot001", SlotState.BOOTING)
db.update_slot_state("slot001", SlotState.BINDING, instance_ip="100.64.0.1")
db.update_slot_state("slot001", SlotState.READY)
response = client.post("/v1/admin/drain", json={"slot_id": "slot001"})
assert response.status_code == 200
assert response.json()["state"] == "draining"
slot = db.get_slot("slot001")
assert slot is not None
assert slot["state"] == SlotState.DRAINING.value
def test_admin_drain_invalid_state_returns_409() -> None:
client, _, _, _ = _make_client()
response = client.post("/v1/admin/drain", json={"slot_id": "slot001"})
assert response.status_code == 409
assert response.json()["error"]["code"] == "invalid_state"
def test_admin_unquarantine_success() -> None:
client, db, _, _ = _make_client()
db.update_slot_state("slot001", SlotState.ERROR, instance_id="i-bad")
response = client.post("/v1/admin/unquarantine", json={"slot_id": "slot001"})
assert response.status_code == 200
assert response.json()["state"] == "empty"
slot = db.get_slot("slot001")
assert slot is not None
assert slot["state"] == SlotState.EMPTY.value
assert slot["instance_id"] is None
def test_admin_unquarantine_invalid_state_returns_409() -> None:
client, _, _, _ = _make_client()
response = client.post("/v1/admin/unquarantine", json={"slot_id": "slot001"})
assert response.status_code == 409
assert response.json()["error"]["code"] == "invalid_state"
def test_admin_reconcile_now_not_configured_returns_503() -> None:
client, _, _, _ = _make_client()
response = client.post("/v1/admin/reconcile-now")
assert response.status_code == 503
assert response.json()["error"]["code"] == "not_configured"
def test_admin_reconcile_now_success() -> None:
called = {"value": False}
def _reconcile_now() -> dict[str, object]:
called["value"] = True
return {"triggered": True}
client, _, _, _ = _make_client(reconcile_now=_reconcile_now)
response = client.post("/v1/admin/reconcile-now")
assert response.status_code == 200
assert response.json()["status"] == "accepted"
assert response.json()["triggered"] is True
assert called["value"] is True

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"""Unit tests for the EC2 runtime adapter using botocore Stubber."""
from datetime import UTC, datetime
from unittest.mock import patch
import boto3
import pytest
from botocore.stub import Stubber
from nix_builder_autoscaler.config import AwsConfig
from nix_builder_autoscaler.runtime.base import RuntimeError as RuntimeAdapterError
from nix_builder_autoscaler.runtime.ec2 import EC2Runtime
def _make_config():
return AwsConfig(
region="us-east-1",
launch_template_id="lt-abc123",
subnet_ids=["subnet-aaa", "subnet-bbb"],
security_group_ids=["sg-111"],
instance_profile_arn="arn:aws:iam::123456789012:instance-profile/nix-builder",
)
def _make_runtime(stubber, ec2_client, **kwargs):
config = kwargs.pop("config", _make_config())
environment = kwargs.pop("environment", "dev")
stubber.activate()
return EC2Runtime(config, environment=environment, _client=ec2_client)
class TestLaunchSpot:
def test_correct_params_and_returns_instance_id(self):
config = _make_config()
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
expected_params = {
"MinCount": 1,
"MaxCount": 1,
"LaunchTemplate": {
"LaunchTemplateId": "lt-abc123",
"Version": "$Latest",
},
"InstanceMarketOptions": {
"MarketType": "spot",
"SpotOptions": {
"SpotInstanceType": "one-time",
"InstanceInterruptionBehavior": "terminate",
},
},
"SubnetId": "subnet-aaa",
"UserData": "#!/bin/bash\necho hello",
"TagSpecifications": [
{
"ResourceType": "instance",
"Tags": [
{"Key": "Name", "Value": "nix-builder-slot001"},
{"Key": "AutoscalerSlot", "Value": "slot001"},
{"Key": "ManagedBy", "Value": "nix-builder-autoscaler"},
{"Key": "Service", "Value": "nix-builder"},
{"Key": "Environment", "Value": "dev"},
],
}
],
}
response = {
"Instances": [{"InstanceId": "i-12345678"}],
"OwnerId": "123456789012",
}
stubber.add_response("run_instances", response, expected_params)
runtime = _make_runtime(stubber, ec2_client, config=config)
iid = runtime.launch_spot("slot001", "#!/bin/bash\necho hello")
assert iid == "i-12345678"
stubber.assert_no_pending_responses()
def test_round_robin_subnets(self):
config = _make_config()
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
# Two launches should use subnet-aaa then subnet-bbb
for _subnet in ["subnet-aaa", "subnet-bbb"]:
stubber.add_response(
"run_instances",
{"Instances": [{"InstanceId": "i-abc"}], "OwnerId": "123"},
)
runtime = _make_runtime(stubber, ec2_client, config=config)
runtime.launch_spot("slot001", "")
runtime.launch_spot("slot002", "")
stubber.assert_no_pending_responses()
class TestDescribeInstance:
def test_normalizes_response(self):
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
launch_time = datetime(2026, 1, 15, 12, 30, 0, tzinfo=UTC)
response = {
"Reservations": [
{
"Instances": [
{
"InstanceId": "i-running1",
"State": {"Code": 16, "Name": "running"},
"LaunchTime": launch_time,
"Tags": [
{"Key": "AutoscalerSlot", "Value": "slot001"},
],
}
],
}
],
}
stubber.add_response(
"describe_instances",
response,
{"InstanceIds": ["i-running1"]},
)
runtime = _make_runtime(stubber, ec2_client)
info = runtime.describe_instance("i-running1")
assert info["state"] == "running"
assert info["tailscale_ip"] is None
assert info["launch_time"] == launch_time.isoformat()
@patch.object(
EC2Runtime,
"_read_tailscale_status",
return_value={
"Peer": {
"peer1": {
"HostName": "nix-builder-slot001-i-running1",
"Online": True,
"TailscaleIPs": ["100.64.0.10"],
}
}
},
)
def test_discovers_tailscale_ip_from_localapi(self, _mock_status):
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
launch_time = datetime(2026, 1, 15, 12, 30, 0, tzinfo=UTC)
response = {
"Reservations": [
{
"Instances": [
{
"InstanceId": "i-running1",
"State": {"Code": 16, "Name": "running"},
"LaunchTime": launch_time,
"Tags": [{"Key": "AutoscalerSlot", "Value": "slot001"}],
}
],
}
],
}
stubber.add_response(
"describe_instances",
response,
{"InstanceIds": ["i-running1"]},
)
runtime = _make_runtime(stubber, ec2_client)
info = runtime.describe_instance("i-running1")
assert info["tailscale_ip"] == "100.64.0.10"
@patch.object(EC2Runtime, "_read_tailscale_status", return_value={"Peer": {}})
def test_discovery_unavailable_returns_none(self, _mock_status):
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
launch_time = datetime(2026, 1, 15, 12, 30, 0, tzinfo=UTC)
response = {
"Reservations": [
{
"Instances": [
{
"InstanceId": "i-running1",
"State": {"Code": 16, "Name": "running"},
"LaunchTime": launch_time,
"Tags": [{"Key": "AutoscalerSlot", "Value": "slot001"}],
}
],
}
],
}
stubber.add_response(
"describe_instances",
response,
{"InstanceIds": ["i-running1"]},
)
runtime = _make_runtime(stubber, ec2_client)
info = runtime.describe_instance("i-running1")
assert info["tailscale_ip"] is None
@patch.object(
EC2Runtime,
"_read_tailscale_status",
return_value={
"Peer": {
"peer1": {
"HostName": "nix-builder-slot001-old",
"Online": True,
"TailscaleIPs": ["100.64.0.10"],
},
"peer2": {
"HostName": "nix-builder-slot001-new",
"Online": True,
"TailscaleIPs": ["100.64.0.11"],
},
}
},
)
def test_ambiguous_slot_match_returns_none(self, _mock_status):
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
launch_time = datetime(2026, 1, 15, 12, 30, 0, tzinfo=UTC)
response = {
"Reservations": [
{
"Instances": [
{
"InstanceId": "i-running1",
"State": {"Code": 16, "Name": "running"},
"LaunchTime": launch_time,
"Tags": [{"Key": "AutoscalerSlot", "Value": "slot001"}],
}
],
}
],
}
stubber.add_response(
"describe_instances",
response,
{"InstanceIds": ["i-running1"]},
)
runtime = _make_runtime(stubber, ec2_client)
info = runtime.describe_instance("i-running1")
assert info["tailscale_ip"] is None
def test_localapi_permission_error_returns_none(self):
ec2_client = boto3.client("ec2", region_name="us-east-1")
runtime = EC2Runtime(_make_config(), _client=ec2_client)
with patch(
"nix_builder_autoscaler.runtime.ec2._UnixSocketHTTPConnection.connect",
side_effect=PermissionError,
):
assert runtime._read_tailscale_status() is None
def test_missing_instance_returns_terminated(self):
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
stubber.add_response(
"describe_instances",
{"Reservations": []},
{"InstanceIds": ["i-gone"]},
)
runtime = _make_runtime(stubber, ec2_client)
info = runtime.describe_instance("i-gone")
assert info["state"] == "terminated"
assert info["tailscale_ip"] is None
assert info["launch_time"] is None
class TestListManagedInstances:
def test_filters_by_tag(self):
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
expected_params = {
"Filters": [
{"Name": "tag:ManagedBy", "Values": ["nix-builder-autoscaler"]},
{
"Name": "instance-state-name",
"Values": ["pending", "running", "shutting-down", "stopping"],
},
],
}
response = {
"Reservations": [
{
"Instances": [
{
"InstanceId": "i-aaa",
"State": {"Code": 16, "Name": "running"},
"Tags": [
{"Key": "AutoscalerSlot", "Value": "slot001"},
{"Key": "ManagedBy", "Value": "nix-builder-autoscaler"},
],
},
{
"InstanceId": "i-bbb",
"State": {"Code": 0, "Name": "pending"},
"Tags": [
{"Key": "AutoscalerSlot", "Value": "slot002"},
{"Key": "ManagedBy", "Value": "nix-builder-autoscaler"},
],
},
],
}
],
}
stubber.add_response("describe_instances", response, expected_params)
runtime = _make_runtime(stubber, ec2_client)
managed = runtime.list_managed_instances()
assert len(managed) == 2
assert managed[0]["instance_id"] == "i-aaa"
assert managed[0]["state"] == "running"
assert managed[0]["slot_id"] == "slot001"
assert managed[1]["instance_id"] == "i-bbb"
assert managed[1]["state"] == "pending"
assert managed[1]["slot_id"] == "slot002"
class TestTerminateInstance:
def test_calls_terminate_api(self):
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
response = {
"TerminatingInstances": [
{
"InstanceId": "i-kill",
"CurrentState": {"Code": 32, "Name": "shutting-down"},
"PreviousState": {"Code": 16, "Name": "running"},
}
],
}
stubber.add_response(
"terminate_instances",
response,
{"InstanceIds": ["i-kill"]},
)
runtime = _make_runtime(stubber, ec2_client)
# Should not raise
runtime.terminate_instance("i-kill")
stubber.assert_no_pending_responses()
class TestErrorClassification:
def test_insufficient_capacity_classified(self):
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
stubber.add_client_error(
"run_instances",
service_error_code="InsufficientInstanceCapacity",
service_message="Insufficient capacity",
)
runtime = _make_runtime(stubber, ec2_client)
with pytest.raises(RuntimeAdapterError) as exc_info:
runtime.launch_spot("slot001", "#!/bin/bash")
assert exc_info.value.category == "capacity_unavailable"
@patch("nix_builder_autoscaler.runtime.ec2.time.sleep")
def test_request_limit_exceeded_retried(self, mock_sleep):
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
# First call: throttled
stubber.add_client_error(
"run_instances",
service_error_code="RequestLimitExceeded",
service_message="Rate exceeded",
)
# Second call: success
stubber.add_response(
"run_instances",
{"Instances": [{"InstanceId": "i-retry123"}], "OwnerId": "123"},
)
runtime = _make_runtime(stubber, ec2_client)
iid = runtime.launch_spot("slot001", "#!/bin/bash")
assert iid == "i-retry123"
assert mock_sleep.called
stubber.assert_no_pending_responses()
@patch("nix_builder_autoscaler.runtime.ec2.time.sleep")
def test_request_limit_exceeded_exhausted(self, mock_sleep):
"""After max retries, RequestLimitExceeded raises with 'throttled' category."""
ec2_client = boto3.client("ec2", region_name="us-east-1")
stubber = Stubber(ec2_client)
# 4 errors (max_retries=3: attempt 0,1,2,3 all fail)
for _ in range(4):
stubber.add_client_error(
"run_instances",
service_error_code="RequestLimitExceeded",
service_message="Rate exceeded",
)
runtime = _make_runtime(stubber, ec2_client)
with pytest.raises(RuntimeAdapterError) as exc_info:
runtime.launch_spot("slot001", "#!/bin/bash")
assert exc_info.value.category == "throttled"

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"""Unit tests for the FakeRuntime adapter."""
import contextlib
from nix_builder_autoscaler.runtime.base import RuntimeError as RuntimeAdapterError
from nix_builder_autoscaler.runtime.fake import FakeRuntime
class TestLaunchSpot:
def test_returns_synthetic_instance_id(self):
rt = FakeRuntime()
iid = rt.launch_spot("slot001", "#!/bin/bash\necho hello")
assert iid.startswith("i-fake-")
assert len(iid) > 10
def test_instance_starts_pending(self):
rt = FakeRuntime()
iid = rt.launch_spot("slot001", "")
info = rt.describe_instance(iid)
assert info["state"] == "pending"
assert info["tailscale_ip"] is None
class TestTickProgression:
def test_transitions_to_running_after_configured_ticks(self):
rt = FakeRuntime(launch_latency_ticks=3, ip_delay_ticks=1)
iid = rt.launch_spot("slot001", "")
for _ in range(2):
rt.tick()
assert rt.describe_instance(iid)["state"] == "pending"
rt.tick() # tick 3
assert rt.describe_instance(iid)["state"] == "running"
def test_tailscale_ip_appears_after_configured_delay(self):
rt = FakeRuntime(launch_latency_ticks=2, ip_delay_ticks=2)
iid = rt.launch_spot("slot001", "")
for _ in range(2):
rt.tick()
assert rt.describe_instance(iid)["state"] == "running"
assert rt.describe_instance(iid)["tailscale_ip"] is None
rt.tick() # tick 3 — still no IP (need tick 4)
assert rt.describe_instance(iid)["tailscale_ip"] is None
rt.tick() # tick 4
info = rt.describe_instance(iid)
assert info["tailscale_ip"] is not None
assert info["tailscale_ip"].startswith("100.64.0.")
class TestInjectedFailure:
def test_launch_failure_raises(self):
rt = FakeRuntime()
rt.inject_launch_failure("slot001")
try:
rt.launch_spot("slot001", "")
raise AssertionError("Should have raised")
except RuntimeAdapterError as e:
assert e.category == "capacity_unavailable"
def test_failure_is_one_shot(self):
rt = FakeRuntime()
rt.inject_launch_failure("slot001")
with contextlib.suppress(RuntimeAdapterError):
rt.launch_spot("slot001", "")
# Second call should succeed
iid = rt.launch_spot("slot001", "")
assert iid.startswith("i-fake-")
class TestInjectedInterruption:
def test_interruption_returns_terminated(self):
rt = FakeRuntime(launch_latency_ticks=1)
iid = rt.launch_spot("slot001", "")
rt.tick()
assert rt.describe_instance(iid)["state"] == "running"
rt.inject_interruption(iid)
info = rt.describe_instance(iid)
assert info["state"] == "terminated"
def test_interruption_is_one_shot(self):
"""After the interruption fires, subsequent describes stay terminated."""
rt = FakeRuntime(launch_latency_ticks=1)
iid = rt.launch_spot("slot001", "")
rt.tick()
rt.inject_interruption(iid)
rt.describe_instance(iid) # consumes the injection
info = rt.describe_instance(iid)
assert info["state"] == "terminated"
class TestTerminate:
def test_terminate_marks_instance(self):
rt = FakeRuntime(launch_latency_ticks=1)
iid = rt.launch_spot("slot001", "")
rt.tick()
rt.terminate_instance(iid)
assert rt.describe_instance(iid)["state"] == "terminated"
class TestListManaged:
def test_lists_non_terminated(self):
rt = FakeRuntime(launch_latency_ticks=1)
iid1 = rt.launch_spot("slot001", "")
iid2 = rt.launch_spot("slot002", "")
rt.tick()
rt.terminate_instance(iid1)
managed = rt.list_managed_instances()
ids = [m["instance_id"] for m in managed]
assert iid2 in ids
assert iid1 not in ids

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"""Scheduler unit tests — Plan 03."""
from nix_builder_autoscaler.config import AppConfig, AwsConfig, CapacityConfig
from nix_builder_autoscaler.metrics import MetricsRegistry
from nix_builder_autoscaler.models import ReservationPhase, SlotState
from nix_builder_autoscaler.providers.clock import FakeClock
from nix_builder_autoscaler.runtime.fake import FakeRuntime
from nix_builder_autoscaler.scheduler import scheduling_tick
from nix_builder_autoscaler.state_db import StateDB
def _make_env(
slot_count=3,
max_slots=3,
max_leases=1,
idle_scale_down_seconds=900,
target_warm=0,
min_slots=0,
):
clock = FakeClock()
db = StateDB(":memory:", clock=clock)
db.init_schema()
db.init_slots("slot", slot_count, "x86_64-linux", "all")
runtime = FakeRuntime(launch_latency_ticks=2, ip_delay_ticks=1)
config = AppConfig(
capacity=CapacityConfig(
max_slots=max_slots,
max_leases_per_slot=max_leases,
idle_scale_down_seconds=idle_scale_down_seconds,
target_warm_slots=target_warm,
min_slots=min_slots,
reservation_ttl_seconds=1200,
),
aws=AwsConfig(region="us-east-1"),
)
metrics = MetricsRegistry()
return db, runtime, config, clock, metrics
def _make_slot_ready(db, slot_id, instance_id="i-test1", ip="100.64.0.1"):
"""Transition a slot through the full state machine to ready."""
db.update_slot_state(slot_id, SlotState.LAUNCHING, instance_id=instance_id)
db.update_slot_state(slot_id, SlotState.BOOTING)
db.update_slot_state(slot_id, SlotState.BINDING, instance_ip=ip)
db.update_slot_state(slot_id, SlotState.READY)
# --- Test cases ---
def test_pending_reservation_assigned_to_ready_slot():
db, runtime, config, clock, metrics = _make_env()
_make_slot_ready(db, "slot001")
resv = db.create_reservation("x86_64-linux", "test", None, 1200)
scheduling_tick(db, runtime, config, clock, metrics)
updated = db.get_reservation(resv["reservation_id"])
assert updated["phase"] == ReservationPhase.READY.value
assert updated["slot_id"] == "slot001"
assert updated["instance_id"] == "i-test1"
slot = db.get_slot("slot001")
assert slot["lease_count"] == 1
def test_two_pending_one_slot_only_one_assigned_per_tick():
db, runtime, config, clock, metrics = _make_env(max_leases=1)
_make_slot_ready(db, "slot001")
r1 = db.create_reservation("x86_64-linux", "test1", None, 1200)
r2 = db.create_reservation("x86_64-linux", "test2", None, 1200)
scheduling_tick(db, runtime, config, clock, metrics)
u1 = db.get_reservation(r1["reservation_id"])
u2 = db.get_reservation(r2["reservation_id"])
ready_count = sum(1 for r in [u1, u2] if r["phase"] == ReservationPhase.READY.value)
pending_count = sum(1 for r in [u1, u2] if r["phase"] == ReservationPhase.PENDING.value)
assert ready_count == 1
assert pending_count == 1
slot = db.get_slot("slot001")
assert slot["lease_count"] == 1
def test_reservation_expires_when_ttl_passes():
db, runtime, config, clock, metrics = _make_env()
config.capacity.reservation_ttl_seconds = 60
db.create_reservation("x86_64-linux", "test", None, 60)
clock.advance(61)
scheduling_tick(db, runtime, config, clock, metrics)
reservations = db.list_reservations(ReservationPhase.EXPIRED)
assert len(reservations) == 1
def test_scale_down_starts_when_idle_exceeds_threshold():
db, runtime, config, clock, metrics = _make_env(idle_scale_down_seconds=900)
_make_slot_ready(db, "slot001")
clock.advance(901)
scheduling_tick(db, runtime, config, clock, metrics)
slot = db.get_slot("slot001")
assert slot["state"] == SlotState.DRAINING.value
def test_slot_does_not_drain_while_lease_count_positive():
db, runtime, config, clock, metrics = _make_env(idle_scale_down_seconds=900)
_make_slot_ready(db, "slot001")
resv = db.create_reservation("x86_64-linux", "test", None, 1200)
scheduling_tick(db, runtime, config, clock, metrics)
# Confirm assigned
updated = db.get_reservation(resv["reservation_id"])
assert updated["phase"] == ReservationPhase.READY.value
clock.advance(901)
scheduling_tick(db, runtime, config, clock, metrics)
slot = db.get_slot("slot001")
assert slot["state"] == SlotState.READY.value
def test_interruption_pending_slot_moves_to_draining():
db, runtime, config, clock, metrics = _make_env()
_make_slot_ready(db, "slot001")
db.update_slot_fields("slot001", interruption_pending=1)
scheduling_tick(db, runtime, config, clock, metrics)
slot = db.get_slot("slot001")
assert slot["state"] == SlotState.DRAINING.value
assert slot["interruption_pending"] == 0
def test_launch_triggered_for_unmet_demand():
db, runtime, config, clock, metrics = _make_env()
db.create_reservation("x86_64-linux", "test", None, 1200)
scheduling_tick(db, runtime, config, clock, metrics)
launching = db.list_slots(SlotState.LAUNCHING)
assert len(launching) == 1
assert launching[0]["instance_id"] is not None
# FakeRuntime should have one pending instance
managed = runtime.list_managed_instances()
assert len(managed) == 1
def test_launch_respects_max_slots():
db, runtime, config, clock, metrics = _make_env(max_slots=1)
_make_slot_ready(db, "slot001")
# Slot001 is at capacity (lease_count will be 1 after assignment)
db.create_reservation("x86_64-linux", "test1", None, 1200)
db.create_reservation("x86_64-linux", "test2", None, 1200)
scheduling_tick(db, runtime, config, clock, metrics)
# One reservation assigned, one still pending — but no new launch
# because active_slots (1) == max_slots (1)
launching = db.list_slots(SlotState.LAUNCHING)
assert len(launching) == 0
def test_min_slots_maintained():
db, runtime, config, clock, metrics = _make_env(min_slots=1)
# No reservations, all slots empty
scheduling_tick(db, runtime, config, clock, metrics)
launching = db.list_slots(SlotState.LAUNCHING)
assert len(launching) == 1
def test_scale_down_respects_min_slots():
db, runtime, config, clock, metrics = _make_env(min_slots=1, idle_scale_down_seconds=900)
_make_slot_ready(db, "slot001")
clock.advance(901)
scheduling_tick(db, runtime, config, clock, metrics)
slot = db.get_slot("slot001")
assert slot["state"] == SlotState.READY.value

46
agent/pyproject.toml Normal file
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@ -0,0 +1,46 @@
[build-system]
requires = ["setuptools>=68", "wheel"]
build-backend = "setuptools.build_meta"
[project]
name = "nix-builder-autoscaler"
version = "0.1.0"
description = "Autoscaler daemon for Nix remote builders on EC2 Spot instances"
requires-python = ">=3.12"
dependencies = [
"boto3",
"fastapi",
"uvicorn[standard]",
]
[project.scripts]
autoscalerctl = "nix_builder_autoscaler.cli:main"
[dependency-groups]
dev = [
"ruff",
"pyright",
"pytest",
"httpx",
"botocore",
]
[tool.ruff]
target-version = "py312"
line-length = 100
[tool.ruff.lint]
select = ["E", "F", "I", "UP", "B", "SIM", "ANN"]
ignore = ["ANN401"]
[tool.ruff.lint.per-file-ignores]
"*/tests/*" = ["ANN"]
[tool.pyright]
pythonVersion = "3.12"
typeCheckingMode = "standard"
include = ["nix_builder_autoscaler"]
exclude = ["**/tests"]
[tool.pytest.ini_options]
testpaths = ["nix_builder_autoscaler/tests"]

714
agent/uv.lock generated Normal file
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@ -0,0 +1,714 @@
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revision = 3
requires-python = ">=3.12"
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12
buildbot-ext/buildbot_autoscale_ext/__init__.py Normal file
View file

@ -0,0 +1,12 @@
"""Buildbot autoscale extension package."""
from .configurator import AutoscaleConfigurator
from .settings import AutoscaleSettings
from .steps import CapacityGateStep, CapacityReleaseStep
__all__ = [
"AutoscaleConfigurator",
"AutoscaleSettings",
"CapacityGateStep",
"CapacityReleaseStep",
]

169
buildbot-ext/buildbot_autoscale_ext/client.py Normal file
View file

@ -0,0 +1,169 @@
from __future__ import annotations
import http.client
import json
import random
import socket
import time
from dataclasses import dataclass
from typing import Any
@dataclass(frozen=True)
class RetryPolicy:
max_attempts: int
base_seconds: float
max_seconds: float
class DaemonError(RuntimeError):
def __init__(
self,
message: str,
*,
path: str,
status: int | None = None,
response: dict[str, Any] | None = None,
cause: Exception | None = None,
) -> None:
super().__init__(message)
self.path = path
self.status = status
self.response = response
self.cause = cause
class UnixSocketHTTPConnection(http.client.HTTPConnection):
def __init__(self, socket_path: str, timeout: float) -> None:
super().__init__(host="localhost", port=0, timeout=timeout)
self._socket_path = socket_path
def connect(self) -> None:
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.sock.settimeout(self.timeout)
self.sock.connect(self._socket_path)
class DaemonClient:
def __init__(self, socket_path: str, retry_policy: RetryPolicy) -> None:
self._socket_path = socket_path
self._retry = retry_policy
def post_json(
self,
path: str,
body: dict[str, Any],
timeout_seconds: float,
retryable_statuses: set[int],
) -> dict[str, Any]:
return self._request_json(
method="POST",
path=path,
timeout_seconds=timeout_seconds,
retryable_statuses=retryable_statuses,
body=body,
)
def get_json(
self,
path: str,
timeout_seconds: float,
retryable_statuses: set[int],
) -> dict[str, Any]:
return self._request_json(
method="GET",
path=path,
timeout_seconds=timeout_seconds,
retryable_statuses=retryable_statuses,
body=None,
)
def _request_json(
self,
*,
method: str,
path: str,
timeout_seconds: float,
retryable_statuses: set[int],
body: dict[str, Any] | None,
) -> dict[str, Any]:
last_error: DaemonError | None = None
for attempt in range(1, self._retry.max_attempts + 1):
try:
payload = json.dumps(body).encode("utf-8") if body is not None else None
response_body, status = self._raw_request(
method=method,
path=path,
timeout_seconds=timeout_seconds,
payload=payload,
)
parsed = self._parse_json(response_body, path)
if 200 <= status < 300:
return parsed
err = DaemonError(
f"daemon returned HTTP {status} for {method} {path}",
path=path,
status=status,
response=parsed,
)
retryable = status in retryable_statuses
if not retryable:
raise err
last_error = err
except (ConnectionRefusedError, FileNotFoundError, TimeoutError, OSError) as exc:
last_error = DaemonError(
f"daemon transport error during {method} {path}: {exc}",
path=path,
cause=exc,
)
except DaemonError:
raise
if attempt < self._retry.max_attempts:
self._sleep_backoff(attempt)
assert last_error is not None
raise last_error
def _raw_request(
self,
*,
method: str,
path: str,
timeout_seconds: float,
payload: bytes | None,
) -> tuple[bytes, int]:
conn = UnixSocketHTTPConnection(self._socket_path, timeout=timeout_seconds)
headers = {"Accept": "application/json"}
if payload is not None:
headers["Content-Type"] = "application/json"
try:
conn.request(method=method, url=path, body=payload, headers=headers)
response = conn.getresponse()
data = response.read()
return data, response.status
finally:
conn.close()
@staticmethod
def _parse_json(raw: bytes, path: str) -> dict[str, Any]:
if not raw:
return {}
try:
data = json.loads(raw.decode("utf-8"))
except json.JSONDecodeError as exc:
raise DaemonError(
f"daemon returned invalid JSON for {path}",
path=path,
cause=exc,
) from exc
if not isinstance(data, dict):
raise DaemonError(f"daemon returned non-object JSON for {path}", path=path)
return data
def _sleep_backoff(self, attempt: int) -> None:
ceiling = min(self._retry.max_seconds, self._retry.base_seconds * (2 ** (attempt - 1)))
time.sleep(random.uniform(0.0, ceiling))

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buildbot-ext/buildbot_autoscale_ext/configurator.py Normal file
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from __future__ import annotations
import logging
from typing import Any
from buildbot.configurators import ConfiguratorBase
from .settings import AutoscaleSettings
from .steps import CapacityGateStep, CapacityReleaseStep
log = logging.getLogger(__name__)
class AutoscaleConfigurator(ConfiguratorBase):
def __init__(self, settings: AutoscaleSettings) -> None:
super().__init__()
self.settings = settings
def configure(self, config_dict: dict[str, Any]) -> None:
builders = config_dict.get("builders", [])
patched: list[str] = []
for builder in builders:
name = getattr(builder, "name", "")
if not isinstance(name, str) or not name.endswith("/nix-build"):
continue
factory = getattr(builder, "factory", None)
steps = getattr(factory, "steps", None)
if factory is None or not isinstance(steps, list):
log.warning("Skipping builder with unrecognized factory shape: %s", name)
continue
gate = CapacityGateStep(
name="Ensure remote builder capacity",
daemon_socket=self.settings.daemon_socket,
system_property=self.settings.system_property,
default_system=self.settings.default_system,
reserve_timeout_seconds=self.settings.reserve_timeout_seconds,
poll_interval_seconds=self.settings.poll_interval_seconds,
retry_max_attempts=self.settings.retry_max_attempts,
retry_base_seconds=self.settings.retry_base_seconds,
retry_max_seconds=self.settings.retry_max_seconds,
haltOnFailure=True,
flunkOnFailure=True,
warnOnFailure=False,
)
steps.insert(0, gate)
if self.settings.release_on_finish:
steps.append(
CapacityReleaseStep(
name="Release autoscaler reservation",
daemon_socket=self.settings.daemon_socket,
retry_max_attempts=self.settings.retry_max_attempts,
retry_base_seconds=self.settings.retry_base_seconds,
retry_max_seconds=self.settings.retry_max_seconds,
alwaysRun=True,
flunkOnFailure=False,
warnOnFailure=True,
)
)
patched.append(name)
log.info("AutoscaleConfigurator patched builders: %s", patched)

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buildbot-ext/buildbot_autoscale_ext/settings.py Normal file
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from dataclasses import dataclass
@dataclass(frozen=True)
class AutoscaleSettings:
daemon_socket: str
system_property: str = "system"
default_system: str = "x86_64-linux"
reserve_timeout_seconds: int = 900
poll_interval_seconds: float = 5.0
retry_max_attempts: int = 5
retry_base_seconds: float = 0.5
retry_max_seconds: float = 5.0
release_on_finish: bool = True

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buildbot-ext/buildbot_autoscale_ext/steps.py Normal file
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from __future__ import annotations
import time
from typing import Any, cast
from buildbot.plugins import util
from buildbot.process import buildstep
from twisted.internet import defer, reactor
from twisted.internet.interfaces import IReactorTime
from twisted.internet.task import deferLater
from twisted.internet.threads import deferToThread
from .client import DaemonClient, DaemonError, RetryPolicy
from .telemetry import phase_message
class CapacityGateStep(buildstep.BuildStep):
renderables = ()
def __init__(
self,
*,
daemon_socket: str,
system_property: str,
default_system: str,
reserve_timeout_seconds: int,
poll_interval_seconds: float,
retry_max_attempts: int,
retry_base_seconds: float,
retry_max_seconds: float = 5.0,
**kwargs: object,
) -> None:
super().__init__(**kwargs)
self._system_property = system_property
self._default_system = default_system
self._reserve_timeout_seconds = reserve_timeout_seconds
self._poll_interval_seconds = poll_interval_seconds
self._client = DaemonClient(
socket_path=daemon_socket,
retry_policy=RetryPolicy(
max_attempts=retry_max_attempts,
base_seconds=retry_base_seconds,
max_seconds=retry_max_seconds,
),
)
def _determine_system(self) -> str:
if self.build is None:
return self._default_system
props = self.build.getProperties()
value = props.getProperty(self._system_property)
if value:
return str(value)
return self._default_system
def run(self) -> defer.Deferred[int]:
return defer.ensureDeferred(self._run())
async def _run(self) -> int:
system = self._determine_system()
start = time.monotonic()
try:
reserve = await deferToThread(
self._client.post_json,
"/v1/reservations",
{
"system": system,
"reason": "buildbot-nix-build",
"build_id": getattr(self.build, "buildid", None),
},
10.0,
{429, 500, 502, 503, 504},
)
except Exception as exc: # noqa: BLE001
await self._add_log("autoscale_gate_reserve_error", f"reserve failed: {exc}")
self.descriptionDone = ["capacity reservation failed after retries"]
return util.FAILURE
reservation_id = str(reserve["reservation_id"])
self._set_property("autoscale_reservation_id", reservation_id)
last_phase: str | None = "pending"
last_reason: str | None = None
while True:
elapsed = time.monotonic() - start
self.descriptionSuffix = [f"phase={last_phase} elapsed={int(elapsed)}s"]
if elapsed > self._reserve_timeout_seconds:
await self._add_log(
"autoscale_gate_timeout",
f"capacity wait timeout {phase_message(last_phase, last_reason)}",
)
self.descriptionDone = ["capacity wait timeout"]
return util.FAILURE
try:
status = await deferToThread(
self._client.get_json,
f"/v1/reservations/{reservation_id}",
10.0,
{429, 500, 502, 503, 504},
)
except DaemonError as exc:
last_reason = str(exc)
await deferLater(
cast(IReactorTime, reactor),
self._poll_interval_seconds,
lambda: None,
)
continue
phase = str(status.get("phase", "pending"))
reason = status.get("reason")
last_phase = phase
last_reason = str(reason) if reason is not None else None
if phase == "ready":
slot = str(status["slot"])
instance_id = str(status["instance_id"])
waited = int(time.monotonic() - start)
self._set_property("autoscale_slot", slot)
self._set_property("autoscale_instance_id", instance_id)
self._set_property("autoscale_wait_seconds", waited)
self.descriptionDone = [f"capacity ready in {waited}s"]
self.descriptionSuffix = [f"phase={phase}"]
return util.SUCCESS
if phase in {"failed", "expired", "released"}:
await self._add_log(
"autoscale_gate_failure",
f"capacity gate terminal {phase_message(last_phase, last_reason)}",
)
self.descriptionDone = [f"autoscaler reservation {phase}"]
self.descriptionSuffix = [f"phase={phase}"]
return util.FAILURE
await deferLater(
cast(IReactorTime, reactor),
self._poll_interval_seconds,
lambda: None,
)
def _set_property(self, name: str, value: object) -> None:
if self.build is None:
return
self.build.setProperty(name, value, "autoscale")
async def _add_log(self, name: str, message: str) -> None:
log = cast(Any, await self.addLog(name))
log.addStderr(f"{message}\n")
class CapacityReleaseStep(buildstep.BuildStep):
def __init__(
self,
*,
daemon_socket: str,
retry_max_attempts: int,
retry_base_seconds: float,
retry_max_seconds: float = 5.0,
**kwargs: object,
) -> None:
super().__init__(**kwargs)
self._client = DaemonClient(
socket_path=daemon_socket,
retry_policy=RetryPolicy(
max_attempts=retry_max_attempts,
base_seconds=retry_base_seconds,
max_seconds=retry_max_seconds,
),
)
def run(self) -> defer.Deferred[int]:
return defer.ensureDeferred(self._run())
async def _run(self) -> int:
if self.build is None:
return util.SKIPPED
reservation_id = self.build.getProperty("autoscale_reservation_id")
if not reservation_id:
return util.SKIPPED
try:
await deferToThread(
self._client.post_json,
f"/v1/reservations/{reservation_id}/release",
{},
10.0,
{429, 500, 502, 503, 504},
)
except Exception as exc: # noqa: BLE001
log = cast(Any, await self.addLog("autoscale_release_error"))
log.addStderr(f"release failed: {exc}\n")
return util.WARNINGS
self.descriptionDone = ["autoscaler reservation released"]
return util.SUCCESS

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buildbot-ext/buildbot_autoscale_ext/telemetry.py Normal file
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from __future__ import annotations
import logging
def get_logger(name: str) -> logging.Logger:
return logging.getLogger(name)
def event(logger: logging.Logger, level: int, name: str, **fields: object) -> None:
logger.log(level, "%s %s", name, " ".join(f"{key}={value!r}" for key, value in fields.items()))
def phase_message(phase: str | None, reason: str | None) -> str:
details: list[str] = []
if phase:
details.append(f"phase={phase}")
if reason:
details.append(f"reason={reason}")
return " ".join(details) if details else "no daemon details"

11
buildbot-ext/buildbot_autoscale_ext/tests/__init__.py Normal file
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"""Tests for buildbot_autoscale_ext."""
import asyncio
from contextlib import suppress
from twisted.internet import asyncioreactor
TEST_LOOP = asyncio.new_event_loop()
with suppress(Exception):
asyncioreactor.install(TEST_LOOP)

212
buildbot-ext/buildbot_autoscale_ext/tests/test_client.py Normal file
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from __future__ import annotations
import json
import os
import socketserver
import tempfile
import threading
from collections.abc import Callable
from contextlib import suppress
from dataclasses import dataclass
from http import HTTPStatus
from http.server import BaseHTTPRequestHandler
from pathlib import Path
from typing import Any
import pytest
from buildbot_autoscale_ext.client import (
DaemonClient,
DaemonError,
RetryPolicy,
UnixSocketHTTPConnection,
)
@dataclass
class ServerState:
post_count: int = 0
get_count: int = 0
class _Handler(BaseHTTPRequestHandler):
server: _UnixHTTPServer
def do_GET(self) -> None: # noqa: N802
self.server.state.get_count += 1
status, body = self.server.on_get(self.path, self.server.state.get_count)
self._send(status, body)
def do_POST(self) -> None: # noqa: N802
self.server.state.post_count += 1
size = int(self.headers.get("Content-Length", "0"))
raw = self.rfile.read(size) if size else b"{}"
payload = json.loads(raw.decode("utf-8"))
status, body = self.server.on_post(self.path, payload, self.server.state.post_count)
self._send(status, body)
def log_message(self, format: str, *args: object) -> None:
del format, args
def _send(self, status: int, body: dict[str, Any]) -> None:
encoded = json.dumps(body).encode("utf-8")
self.send_response(status)
self.send_header("Content-Type", "application/json")
self.send_header("Content-Length", str(len(encoded)))
self.end_headers()
self.wfile.write(encoded)
class _UnixHTTPServer(socketserver.UnixStreamServer):
def __init__(
self,
socket_path: str,
*,
on_get: Callable[[str, int], tuple[int, dict[str, Any]]],
on_post: Callable[[str, dict[str, Any], int], tuple[int, dict[str, Any]]],
) -> None:
self.on_get = on_get
self.on_post = on_post
self.state = ServerState()
super().__init__(socket_path, _Handler)
class FakeDaemon:
def __init__(
self,
socket_path: str,
*,
on_get: Callable[[str, int], tuple[int, dict[str, Any]]],
on_post: Callable[[str, dict[str, Any], int], tuple[int, dict[str, Any]]],
) -> None:
self._socket_path = socket_path
self._server = _UnixHTTPServer(socket_path, on_get=on_get, on_post=on_post)
self._thread = threading.Thread(target=self._server.serve_forever, daemon=True)
def __enter__(self) -> FakeDaemon:
self._thread.start()
return self
def __exit__(self, exc_type: object, exc: object, tb: object) -> None:
del exc_type, exc, tb
self._server.shutdown()
self._server.server_close()
with suppress(FileNotFoundError):
os.unlink(self._socket_path)
@pytest.fixture
def socket_path() -> str:
with tempfile.TemporaryDirectory() as tmp:
yield str(Path(tmp) / "daemon.sock")
def _client(socket_path: str, attempts: int = 3) -> DaemonClient:
return DaemonClient(
socket_path=socket_path,
retry_policy=RetryPolicy(max_attempts=attempts, base_seconds=0.001, max_seconds=0.01),
)
def test_post_json_success(socket_path: str) -> None:
with FakeDaemon(
socket_path,
on_get=lambda _p, _a: (HTTPStatus.OK, {}),
on_post=lambda _p, payload, _a: (HTTPStatus.OK, {"echo": payload["system"]}),
):
response = _client(socket_path).post_json(
"/v1/reservations",
{"system": "x86_64-linux"},
timeout_seconds=1.0,
retryable_statuses={429, 500, 503},
)
assert response == {"echo": "x86_64-linux"}
def test_get_json_success(socket_path: str) -> None:
with FakeDaemon(
socket_path,
on_get=lambda _p, _a: (HTTPStatus.OK, {"phase": "ready"}),
on_post=lambda _p, _payload, _a: (HTTPStatus.OK, {}),
):
response = _client(socket_path).get_json(
"/v1/reservations/r1",
timeout_seconds=1.0,
retryable_statuses={429, 500, 503},
)
assert response == {"phase": "ready"}
def test_transient_503_retries_then_raises(socket_path: str) -> None:
with (
FakeDaemon(
socket_path,
on_get=lambda _p, _a: (HTTPStatus.SERVICE_UNAVAILABLE, {"error": "busy"}),
on_post=lambda _p, _payload, _a: (HTTPStatus.OK, {}),
) as daemon,
pytest.raises(DaemonError) as exc,
):
_client(socket_path, attempts=3).get_json(
"/v1/reservations/r1",
timeout_seconds=1.0,
retryable_statuses={429, 500, 502, 503, 504},
)
assert exc.value.status == HTTPStatus.SERVICE_UNAVAILABLE
assert daemon._server.state.get_count == 3
def test_400_not_retried(socket_path: str) -> None:
with (
FakeDaemon(
socket_path,
on_get=lambda _p, _a: (HTTPStatus.BAD_REQUEST, {"error": "bad"}),
on_post=lambda _p, _payload, _a: (HTTPStatus.OK, {}),
) as daemon,
pytest.raises(DaemonError) as exc,
):
_client(socket_path, attempts=5).get_json(
"/v1/reservations/r1",
timeout_seconds=1.0,
retryable_statuses={429, 500, 502, 503, 504},
)
assert exc.value.status == HTTPStatus.BAD_REQUEST
assert daemon._server.state.get_count == 1
def test_connection_refused_retries_then_raises(
socket_path: str,
monkeypatch: pytest.MonkeyPatch,
) -> None:
def _boom(self: UnixSocketHTTPConnection) -> None:
raise ConnectionRefusedError("refused")
monkeypatch.setattr(UnixSocketHTTPConnection, "connect", _boom)
with pytest.raises(DaemonError):
_client(socket_path, attempts=3).get_json(
"/v1/reservations/r1",
timeout_seconds=1.0,
retryable_statuses={429, 500, 502, 503, 504},
)
def test_backoff_attempts_at_least_two(socket_path: str) -> None:
with (
FakeDaemon(
socket_path,
on_get=lambda _p, _a: (HTTPStatus.SERVICE_UNAVAILABLE, {"error": "busy"}),
on_post=lambda _p, _payload, _a: (HTTPStatus.OK, {}),
) as daemon,
pytest.raises(DaemonError),
):
_client(socket_path, attempts=2).get_json(
"/v1/reservations/r1",
timeout_seconds=1.0,
retryable_statuses={429, 500, 502, 503, 504},
)
assert daemon._server.state.get_count >= 2

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buildbot-ext/buildbot_autoscale_ext/tests/test_configurator.py Normal file
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from __future__ import annotations
import logging
from dataclasses import dataclass, field
import pytest
from buildbot_autoscale_ext.configurator import AutoscaleConfigurator
from buildbot_autoscale_ext.settings import AutoscaleSettings
from buildbot_autoscale_ext.steps import CapacityGateStep, CapacityReleaseStep
@dataclass
class FakeFactory:
steps: list[object] = field(default_factory=list)
@dataclass
class FakeBuilder:
name: str
factory: FakeFactory
def test_patches_nix_builders() -> None:
cfg = {
"builders": [
FakeBuilder("proj/nix-build", FakeFactory(["original"])),
FakeBuilder("proj/eval", FakeFactory(["eval"])),
]
}
AutoscaleConfigurator(AutoscaleSettings(daemon_socket="/tmp/daemon.sock")).configure(cfg)
patched_steps = cfg["builders"][0].factory.steps
assert isinstance(patched_steps[0], CapacityGateStep)
assert patched_steps[1] == "original"
assert isinstance(patched_steps[-1], CapacityReleaseStep)
untouched_steps = cfg["builders"][1].factory.steps
assert untouched_steps == ["eval"]
def test_empty_builders_no_error() -> None:
cfg = {"builders": []}
AutoscaleConfigurator(AutoscaleSettings(daemon_socket="/tmp/daemon.sock")).configure(cfg)
def test_startup_log_contains_patched_names(caplog: pytest.LogCaptureFixture) -> None:
caplog.set_level(logging.INFO)
cfg = {
"builders": [
FakeBuilder("one/nix-build", FakeFactory()),
FakeBuilder("two/eval", FakeFactory()),
]
}
AutoscaleConfigurator(AutoscaleSettings(daemon_socket="/tmp/daemon.sock")).configure(cfg)
assert "one/nix-build" in caplog.text

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buildbot-ext/buildbot_autoscale_ext/tests/test_steps.py Normal file
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from __future__ import annotations
import json
import os
import socketserver
import tempfile
import threading
from collections.abc import Callable
from contextlib import suppress
from http import HTTPStatus
from http.server import BaseHTTPRequestHandler
from pathlib import Path
from typing import Any
import pytest
from buildbot.plugins import util
from twisted.internet import defer
from buildbot_autoscale_ext.steps import CapacityGateStep, CapacityReleaseStep
class FakeProperties:
def __init__(self, data: dict[str, Any]) -> None:
self._data = data
def getProperty(self, name: str) -> Any:
return self._data.get(name)
class FakeBuild:
def __init__(self) -> None:
self.buildid = 42
self._props: dict[str, Any] = {}
def getProperties(self) -> FakeProperties:
return FakeProperties(self._props)
def setProperty(self, key: str, value: Any, _source: str) -> None:
self._props[key] = value
def getProperty(self, key: str) -> Any:
return self._props.get(key)
class FakeLog:
def __init__(self) -> None:
self.stderr: list[str] = []
def addStderr(self, text: str) -> None:
self.stderr.append(text)
class _Handler(BaseHTTPRequestHandler):
server: _UnixHTTPServer
def do_GET(self) -> None: # noqa: N802
self.server.get_count += 1
status, body = self.server.on_get(self.path, self.server.get_count)
self._send(status, body)
def do_POST(self) -> None: # noqa: N802
self.server.post_count += 1
size = int(self.headers.get("Content-Length", "0"))
raw = self.rfile.read(size) if size else b"{}"
payload = json.loads(raw.decode("utf-8"))
status, body = self.server.on_post(self.path, payload, self.server.post_count)
self._send(status, body)
def _send(self, status: int, body: dict[str, Any]) -> None:
data = json.dumps(body).encode("utf-8")
self.send_response(status)
self.send_header("Content-Type", "application/json")
self.send_header("Content-Length", str(len(data)))
self.end_headers()
self.wfile.write(data)
def log_message(self, format: str, *args: object) -> None:
del format, args
class _UnixHTTPServer(socketserver.UnixStreamServer):
def __init__(
self,
socket_path: str,
*,
on_get: Callable[[str, int], tuple[int, dict[str, Any]]],
on_post: Callable[[str, dict[str, Any], int], tuple[int, dict[str, Any]]],
) -> None:
self.on_get = on_get
self.on_post = on_post
self.get_count = 0
self.post_count = 0
super().__init__(socket_path, _Handler)
class FakeDaemon:
def __init__(
self,
socket_path: str,
*,
on_get: Callable[[str, int], tuple[int, dict[str, Any]]],
on_post: Callable[[str, dict[str, Any], int], tuple[int, dict[str, Any]]],
) -> None:
self._socket_path = socket_path
self._server = _UnixHTTPServer(socket_path, on_get=on_get, on_post=on_post)
self._thread = threading.Thread(target=self._server.serve_forever, daemon=True)
def __enter__(self) -> FakeDaemon:
self._thread.start()
return self
def __exit__(self, exc_type: object, exc: object, tb: object) -> None:
del exc_type, exc, tb
self._server.shutdown()
self._server.server_close()
with suppress(FileNotFoundError):
os.unlink(self._socket_path)
@pytest.fixture
def socket_path() -> str:
with tempfile.TemporaryDirectory() as tmp:
yield str(Path(tmp) / "daemon.sock")
def _attach_build(step: Any, build: FakeBuild) -> None:
object.__setattr__(build, "master", None)
object.__setattr__(step, "build", build)
object.__setattr__(step, "master", None)
async def _add_log(_name: str) -> FakeLog:
return FakeLog()
object.__setattr__(step, "addLog", _add_log)
@pytest.fixture(autouse=True)
def _patch_twisted_waits(monkeypatch: pytest.MonkeyPatch) -> None:
from buildbot.config import errors as config_errors
from buildbot.process import buildstep as buildstep_module
import buildbot_autoscale_ext.steps as steps_mod
def _defer_to_thread(func: Any, *args: object, **kwargs: object) -> defer.Deferred[object]:
try:
return defer.succeed(func(*args, **kwargs))
except Exception as exc: # noqa: BLE001
return defer.fail(exc)
def _defer_later(
_clock: object,
_seconds: float,
callback: Any,
*args: object,
**kwargs: object,
) -> defer.Deferred[object]:
return defer.succeed(callback(*args, **kwargs))
monkeypatch.setattr(steps_mod, "deferToThread", _defer_to_thread)
monkeypatch.setattr(steps_mod, "deferLater", _defer_later)
monkeypatch.setattr(config_errors, "_errors", None, raising=False)
monkeypatch.setattr(buildstep_module.config, "error", lambda *_a, **_k: None)
def _run_step(step: Any) -> int:
deferred = step.run()
out: list[int] = []
failures: list[defer.Failure] = []
deferred.addCallbacks(lambda value: out.append(value), lambda err: failures.append(err))
if failures:
failures[0].raiseException()
return out[0]
def test_gate_success_pending_then_ready(socket_path: str) -> None:
with FakeDaemon(
socket_path,
on_post=lambda _p, _payload, _n: (
HTTPStatus.OK,
{
"reservation_id": "r1",
"phase": "pending",
"created_at": "now",
"expires_at": "soon",
},
),
on_get=lambda _p, n: (
HTTPStatus.OK,
{"reservation_id": "r1", "phase": "pending"}
if n == 1
else {
"reservation_id": "r1",
"phase": "ready",
"slot": "slot-1",
"instance_id": "i-123",
"system": "x86_64-linux",
"updated_at": "now",
},
),
):
step = CapacityGateStep(
name="gate",
daemon_socket=socket_path,
system_property="system",
default_system="x86_64-linux",
reserve_timeout_seconds=2,
poll_interval_seconds=0.01,
retry_max_attempts=2,
retry_base_seconds=0.001,
)
build = FakeBuild()
_attach_build(step, build)
result = _run_step(step)
assert result == util.SUCCESS
assert build.getProperty("autoscale_reservation_id") == "r1"
assert build.getProperty("autoscale_slot") == "slot-1"
assert build.getProperty("autoscale_instance_id") == "i-123"
assert isinstance(build.getProperty("autoscale_wait_seconds"), int)
def test_gate_failure_on_failed_phase(socket_path: str) -> None:
with FakeDaemon(
socket_path,
on_post=lambda _p, _payload, _n: (
HTTPStatus.OK,
{"reservation_id": "r1", "phase": "pending"},
),
on_get=lambda _p, _n: (
HTTPStatus.OK,
{"reservation_id": "r1", "phase": "failed", "reason": "no"},
),
):
step = CapacityGateStep(
name="gate",
daemon_socket=socket_path,
system_property="system",
default_system="x86_64-linux",
reserve_timeout_seconds=2,
poll_interval_seconds=0.01,
retry_max_attempts=2,
retry_base_seconds=0.001,
)
build = FakeBuild()
_attach_build(step, build)
result = _run_step(step)
assert result == util.FAILURE
def test_gate_failure_on_timeout(socket_path: str) -> None:
with FakeDaemon(
socket_path,
on_post=lambda _p, _payload, _n: (
HTTPStatus.OK,
{"reservation_id": "r1", "phase": "pending"},
),
on_get=lambda _p, _n: (HTTPStatus.OK, {"reservation_id": "r1", "phase": "pending"}),
):
step = CapacityGateStep(
name="gate",
daemon_socket=socket_path,
system_property="system",
default_system="x86_64-linux",
reserve_timeout_seconds=0,
poll_interval_seconds=0.01,
retry_max_attempts=2,
retry_base_seconds=0.001,
)
build = FakeBuild()
_attach_build(step, build)
result = _run_step(step)
assert result == util.FAILURE
def test_release_skipped_without_reservation(socket_path: str) -> None:
step = CapacityReleaseStep(
name="release",
daemon_socket=socket_path,
retry_max_attempts=2,
retry_base_seconds=0.001,
)
build = FakeBuild()
_attach_build(step, build)
result = _run_step(step)
assert result == util.SKIPPED
def test_release_warnings_on_retry_exhausted_500(socket_path: str) -> None:
with FakeDaemon(
socket_path,
on_post=lambda _p, _payload, _n: (HTTPStatus.INTERNAL_SERVER_ERROR, {"error": "boom"}),
on_get=lambda _p, _n: (HTTPStatus.OK, {}),
):
step = CapacityReleaseStep(
name="release",
daemon_socket=socket_path,
retry_max_attempts=2,
retry_base_seconds=0.001,
)
build = FakeBuild()
build.setProperty("autoscale_reservation_id", "r1", "test")
_attach_build(step, build)
result = _run_step(step)
assert result == util.WARNINGS
def test_release_success(socket_path: str) -> None:
with FakeDaemon(
socket_path,
on_post=lambda _p, _payload, _n: (
HTTPStatus.OK,
{"reservation_id": "r1", "phase": "released"},
),
on_get=lambda _p, _n: (HTTPStatus.OK, {}),
):
step = CapacityReleaseStep(
name="release",
daemon_socket=socket_path,
retry_max_attempts=2,
retry_base_seconds=0.001,
)
build = FakeBuild()
build.setProperty("autoscale_reservation_id", "r1", "test")
_attach_build(step, build)
result = _run_step(step)
assert result == util.SUCCESS

43
buildbot-ext/pyproject.toml Normal file
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@ -0,0 +1,43 @@
[build-system]
requires = ["setuptools>=68", "wheel"]
build-backend = "setuptools.build_meta"
[project]
name = "buildbot-autoscale-ext"
version = "0.1.0"
description = "Buildbot extension for nix-builder-autoscaler capacity gating"
requires-python = ">=3.12"
dependencies = [
"buildbot",
"twisted",
]
[dependency-groups]
dev = [
"pytest",
"ruff",
"pyright",
]
[tool.uv.extra-build-dependencies]
py-ubjson = ["setuptools"]
[tool.ruff]
target-version = "py312"
line-length = 100
[tool.ruff.lint]
select = ["E", "F", "I", "UP", "B", "SIM", "ANN"]
ignore = []
[tool.ruff.lint.per-file-ignores]
"*/tests/*" = ["ANN"]
[tool.pyright]
pythonVersion = "3.12"
typeCheckingMode = "standard"
include = ["buildbot_autoscale_ext"]
exclude = ["**/tests"]
[tool.pytest.ini_options]
testpaths = ["buildbot_autoscale_ext/tests"]

1052
buildbot-ext/uv.lock generated Normal file
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File diff suppressed because it is too large Load diff

95
flake.lock generated
View file

@ -14,9 +14,102 @@
"url": "https://flakehub.com/f/NixOS/nixpkgs/0.1"
}
},
"pyproject-build-systems": {
"inputs": {
"nixpkgs": [
"nixpkgs"
],
"pyproject-nix": [
"pyproject-nix"
],
"uv2nix": [
"uv2nix"
]
},
"locked": {
"lastModified": 1771423342,
"narHash": "sha256-7uXPiWB0YQ4HNaAqRvVndYL34FEp1ZTwVQHgZmyMtC8=",
"owner": "pyproject-nix",
"repo": "build-system-pkgs",
"rev": "04e9c186e01f0830dad3739088070e4c551191a4",
"type": "github"
},
"original": {
"owner": "pyproject-nix",
"repo": "build-system-pkgs",
"type": "github"
}
},
"pyproject-nix": {
"inputs": {
"nixpkgs": [
"nixpkgs"
]
},
"locked": {
"lastModified": 1771518446,
"narHash": "sha256-nFJSfD89vWTu92KyuJWDoTQJuoDuddkJV3TlOl1cOic=",
"owner": "pyproject-nix",
"repo": "pyproject.nix",
"rev": "eb204c6b3335698dec6c7fc1da0ebc3c6df05937",
"type": "github"
},
"original": {
"owner": "pyproject-nix",
"repo": "pyproject.nix",
"type": "github"
}
},
"root": {
"inputs": {
"nixpkgs": "nixpkgs"
"nixpkgs": "nixpkgs",
"pyproject-build-systems": "pyproject-build-systems",
"pyproject-nix": "pyproject-nix",
"treefmt-nix": "treefmt-nix",
"uv2nix": "uv2nix"
}
},
"treefmt-nix": {
"inputs": {
"nixpkgs": [
"nixpkgs"
]
},
"locked": {
"lastModified": 1770228511,
"narHash": "sha256-wQ6NJSuFqAEmIg2VMnLdCnUc0b7vslUohqqGGD+Fyxk=",
"owner": "numtide",
"repo": "treefmt-nix",
"rev": "337a4fe074be1042a35086f15481d763b8ddc0e7",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "treefmt-nix",
"type": "github"
}
},
"uv2nix": {
"inputs": {
"nixpkgs": [
"nixpkgs"
],
"pyproject-nix": [
"pyproject-nix"
]
},
"locked": {
"lastModified": 1771808991,
"narHash": "sha256-boRfTlN1GfVupWPnhcKlSHJzs9/lJP9KltycPLoPRbA=",
"owner": "pyproject-nix",
"repo": "uv2nix",
"rev": "44d9a110d65fc4caaf9349fa819e8daf9d90d074",
"type": "github"
},
"original": {
"owner": "pyproject-nix",
"repo": "uv2nix",
"type": "github"
}
}
},

321
flake.nix
View file

@ -1,51 +1,304 @@
{
inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1";
description = "nix-builder-autoscaler - autoscaler daemon for Nix remote builders on EC2 Spot";
inputs = {
nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1";
treefmt-nix = {
url = "github:numtide/treefmt-nix";
inputs.nixpkgs.follows = "nixpkgs";
};
pyproject-nix = {
url = "github:pyproject-nix/pyproject.nix";
inputs.nixpkgs.follows = "nixpkgs";
};
uv2nix = {
url = "github:pyproject-nix/uv2nix";
inputs.pyproject-nix.follows = "pyproject-nix";
inputs.nixpkgs.follows = "nixpkgs";
};
pyproject-build-systems = {
url = "github:pyproject-nix/build-system-pkgs";
inputs.pyproject-nix.follows = "pyproject-nix";
inputs.uv2nix.follows = "uv2nix";
inputs.nixpkgs.follows = "nixpkgs";
};
};
outputs =
{ self, nixpkgs }:
{
self,
nixpkgs,
treefmt-nix,
pyproject-nix,
uv2nix,
pyproject-build-systems,
...
}:
let
systems = [
"x86_64-linux"
];
systems = [ "x86_64-linux" ];
forAllSystems = fn: nixpkgs.lib.genAttrs systems (system: fn nixpkgs.legacyPackages.${system});
agentWorkspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./agent; };
agentOverlay = agentWorkspace.mkPyprojectOverlay { sourcePreference = "wheel"; };
buildbotExtWorkspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./buildbot-ext; };
buildbotExtOverlay = buildbotExtWorkspace.mkPyprojectOverlay { sourcePreference = "wheel"; };
pyprojectOverrides = final: prev: {
py-ubjson = prev.py-ubjson.overrideAttrs (old: {
nativeBuildInputs = (old.nativeBuildInputs or [ ]) ++ [ final.setuptools ];
});
};
in
{
#packages = forAllSystems (pkgs: {
# default = pkgs.callPackage ./package.nix { };
#});
formatter = forAllSystems (
pkgs: (treefmt-nix.lib.evalModule pkgs ./treefmt.nix).config.build.wrapper
);
checks = forAllSystems (pkgs: {
# todo add tests
devShell = self.devShells.${pkgs.stdenv.hostPlatform.system}.default;
}
# future nixos test
# // pkgs.lib.optionalAttrs pkgs.stdenv.isLinux {
# nixos-module = pkgs.testers.runNixOSTest (import ./nixos-test.nix self);
# }
packages = forAllSystems (
pkgs:
let
agentPythonSet =
(pkgs.callPackage pyproject-nix.build.packages {
python = pkgs.python312;
}).overrideScope
(
pkgs.lib.composeManyExtensions [
pyproject-build-systems.overlays.default
agentOverlay
pyprojectOverrides
]
);
buildbotExtPythonSet =
(pkgs.callPackage pyproject-nix.build.packages {
python = pkgs.python312;
}).overrideScope
(
pkgs.lib.composeManyExtensions [
pyproject-build-systems.overlays.default
buildbotExtOverlay
pyprojectOverrides
]
);
venv = agentPythonSet.mkVirtualEnv "nix-builder-autoscaler-env" agentWorkspace.deps.default;
buildbotExtVenv = buildbotExtPythonSet.mkVirtualEnv "buildbot-autoscale-ext-env" buildbotExtWorkspace.deps.default;
in
{
nix-builder-autoscaler = venv;
buildbot-autoscale-ext = buildbotExtVenv;
default = venv;
}
);
apps = forAllSystems (
pkgs:
let
venv = self.packages.${pkgs.stdenv.hostPlatform.system}.nix-builder-autoscaler;
in
{
nix-builder-autoscaler = {
type = "app";
program = "${venv}/bin/python";
meta.description = "Nix builder autoscaler daemon";
};
autoscalerctl = {
type = "app";
program = "${venv}/bin/autoscalerctl";
meta.description = "Autoscaler CLI";
};
default = {
type = "app";
program = "${venv}/bin/autoscalerctl";
meta.description = "Autoscaler CLI";
};
}
);
checks = forAllSystems (
pkgs:
let
agentPythonSet =
(pkgs.callPackage pyproject-nix.build.packages {
python = pkgs.python312;
}).overrideScope
(
pkgs.lib.composeManyExtensions [
pyproject-build-systems.overlays.default
agentOverlay
pyprojectOverrides
]
);
buildbotExtPythonSet =
(pkgs.callPackage pyproject-nix.build.packages {
python = pkgs.python312;
}).overrideScope
(
pkgs.lib.composeManyExtensions [
pyproject-build-systems.overlays.default
buildbotExtOverlay
pyprojectOverrides
]
);
testVenv = agentPythonSet.mkVirtualEnv "nix-builder-autoscaler-test-env" {
nix-builder-autoscaler = [ "dev" ];
};
buildbotExtTestVenv = buildbotExtPythonSet.mkVirtualEnv "buildbot-autoscale-ext-test-env" {
buildbot-autoscale-ext = [ "dev" ];
};
src = ./agent;
buildbotExtSrc = ./buildbot-ext;
in
{
devShell = self.devShells.${pkgs.stdenv.hostPlatform.system}.default;
nix-builder-autoscaler-unit-tests = pkgs.stdenv.mkDerivation {
name = "nix-builder-autoscaler-unit-tests";
inherit src;
dontConfigure = true;
dontBuild = true;
nativeBuildInputs = [ testVenv ];
checkPhase = ''
runHook preCheck
export HOME=$(mktemp -d)
pytest nix_builder_autoscaler/tests/ --ignore=nix_builder_autoscaler/tests/integration/ -v
runHook postCheck
'';
doCheck = true;
installPhase = ''
mkdir -p $out
touch $out/passed
'';
};
nix-builder-autoscaler-integration-tests = pkgs.stdenv.mkDerivation {
name = "nix-builder-autoscaler-integration-tests";
inherit src;
dontConfigure = true;
dontBuild = true;
nativeBuildInputs = [ testVenv ];
checkPhase = ''
runHook preCheck
export HOME=$(mktemp -d)
pytest nix_builder_autoscaler/tests/integration/ -v
runHook postCheck
'';
doCheck = true;
installPhase = ''
mkdir -p $out
touch $out/passed
'';
};
nix-builder-autoscaler-ruff = pkgs.stdenv.mkDerivation {
name = "nix-builder-autoscaler-ruff";
inherit src;
dontConfigure = true;
dontBuild = true;
nativeBuildInputs = [ testVenv ];
checkPhase = ''
runHook preCheck
ruff check nix_builder_autoscaler/
ruff format --check nix_builder_autoscaler/
runHook postCheck
'';
doCheck = true;
installPhase = ''
mkdir -p $out
touch $out/passed
'';
};
nix-builder-autoscaler-pyright = pkgs.stdenv.mkDerivation {
name = "nix-builder-autoscaler-pyright";
inherit src;
dontConfigure = true;
dontBuild = true;
nativeBuildInputs = [
testVenv
pkgs.nodejs
];
checkPhase = ''
runHook preCheck
export HOME=$(mktemp -d)
pyright nix_builder_autoscaler/
runHook postCheck
'';
doCheck = true;
installPhase = ''
mkdir -p $out
touch $out/passed
'';
};
buildbot-autoscale-ext-tests = pkgs.stdenv.mkDerivation {
name = "buildbot-autoscale-ext-tests";
src = buildbotExtSrc;
dontConfigure = true;
dontBuild = true;
nativeBuildInputs = [ buildbotExtTestVenv ];
checkPhase = ''
runHook preCheck
export HOME=$(mktemp -d)
pytest buildbot_autoscale_ext/tests/ -v
runHook postCheck
'';
doCheck = true;
installPhase = ''
mkdir -p $out
touch $out/passed
'';
};
buildbot-autoscale-ext-ruff = pkgs.stdenv.mkDerivation {
name = "buildbot-autoscale-ext-ruff";
src = buildbotExtSrc;
dontConfigure = true;
dontBuild = true;
nativeBuildInputs = [ buildbotExtTestVenv ];
checkPhase = ''
runHook preCheck
ruff check buildbot_autoscale_ext/
ruff format --check buildbot_autoscale_ext/
runHook postCheck
'';
doCheck = true;
installPhase = ''
mkdir -p $out
touch $out/passed
'';
};
buildbot-autoscale-ext-pyright = pkgs.stdenv.mkDerivation {
name = "buildbot-autoscale-ext-pyright";
src = buildbotExtSrc;
dontConfigure = true;
dontBuild = true;
nativeBuildInputs = [
buildbotExtTestVenv
pkgs.nodejs
];
checkPhase = ''
runHook preCheck
export HOME=$(mktemp -d)
pyright buildbot_autoscale_ext/
runHook postCheck
'';
doCheck = true;
installPhase = ''
mkdir -p $out
touch $out/passed
'';
};
}
);
devShells = forAllSystems (pkgs: {
default = pkgs.mkShell {
packages = with pkgs; [
# TODO populate devshell for the project
uv
ruff
pyright
];
};
});
# TODO export module
# nixosModules = {
# default =
# {
# config,
# lib,
# pkgs,
# ...
# }:
# {
# imports = [ ./nixos-module.nix ];
# services.TODSERVICENAME.package =
# lib.mkDefault
# self.packages.${pkgs.stdenv.hostPlatform.system}.default;
# };
# };
};
}

7
treefmt.nix Normal file
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@ -0,0 +1,7 @@
{ pkgs, ... }:
{
projectRootFile = "flake.nix";
programs.nixfmt.enable = true;
programs.ruff-check.enable = true;
programs.ruff-format.enable = true;
}