majuna/app/terraform/alarms/proxy_http_status.py

from typing import Tuple

import requests

from app.extensions import db
from app.models.alarms import Alarm, AlarmState
from app.models.mirrors import Proxy
from app.terraform import BaseAutomation


def set_http_alarm(proxy_id: int, state: AlarmState, text: str) -> None:
    alarm = Alarm.query.filter(
        Alarm.proxy_id == proxy_id,
        Alarm.alarm_type == "http-status"
    ).first()
    if alarm is None:
        alarm = Alarm()
        alarm.proxy_id = proxy_id
        alarm.alarm_type = "http-status"
        alarm.target = "proxy"
        db.session.add(alarm)
    alarm.update_state(state, text)


class AlarmProxyHTTPStatusAutomation(BaseAutomation):
    short_name = "alarm_http_status"
    description = "Check all deployed proxies for HTTP status code"
    frequency = 45

    def automate(self, full: bool = False) -> Tuple[bool, str]:
        proxies = Proxy.query.filter(
            Proxy.destroyed == None
        )
        for proxy in proxies:
            try:
                if proxy.url is None:
                    continue
                r = requests.get(proxy.url,
                                 allow_redirects=False,
                                 timeout=5)
                r.raise_for_status()
                if r.is_redirect:
                    set_http_alarm(
                        proxy.id,
                        AlarmState.CRITICAL,
                        f"{r.status_code} {r.reason}"
                    )
                else:
                    set_http_alarm(
                        proxy.id,
                        AlarmState.OK,
                        f"{r.status_code} {r.reason}"
                    )
            except requests.HTTPError:
                set_http_alarm(
                    proxy.id,
                    AlarmState.CRITICAL,
                    f"{r.status_code} {r.reason}"
                )
            except (requests.ConnectionError, requests.Timeout, ConnectionError) as e:
                set_http_alarm(
                    proxy.id,
                    AlarmState.CRITICAL,
                    repr(e)
                )
        return True, ""