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Add logrus, prometheus client and matrix-org/util

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Kegan Dougal 2017-02-03 15:41:25 +00:00
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Apache License
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# util
[![GoDoc](https://godoc.org/github.com/matrix-org/util?status.svg)](https://godoc.org/github.com/matrix-org/util)
[![Build Status](https://travis-ci.org/matrix-org/util.svg?branch=master)](https://travis-ci.org/matrix-org/util)
[![Coverage Status](https://coveralls.io/repos/github/matrix-org/util/badge.svg)](https://coveralls.io/github/matrix-org/util)
A loose collection of Golang functions that we use at matrix.org

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package util
import "fmt"
// HTTPError An HTTP Error response, which may wrap an underlying native Go Error.
type HTTPError struct {
WrappedError error
Message string
Code int
}
func (e HTTPError) Error() string {
var wrappedErrMsg string
if e.WrappedError != nil {
wrappedErrMsg = e.WrappedError.Error()
}
return fmt.Sprintf("%s: %d: %s", e.Message, e.Code, wrappedErrMsg)
}

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#! /bin/bash
DOT_GIT="$(dirname $0)/../.git"
ln -s "../../hooks/pre-commit" "$DOT_GIT/hooks/pre-commit"

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#! /bin/bash
set -eu
golint
go fmt
go tool vet --all --shadow .
gocyclo -over 12 .
go test -timeout 5s -test.v

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package util
import (
"context"
"encoding/json"
"fmt"
"math/rand"
"net/http"
"runtime/debug"
log "github.com/Sirupsen/logrus"
)
// ContextKeys is a type alias for string to namespace Context keys per-package.
type ContextKeys string
// CtxValueLogger is the key to extract the logrus Logger.
const CtxValueLogger = ContextKeys("logger")
// JSONRequestHandler represents an interface that must be satisfied in order to respond to incoming
// HTTP requests with JSON. The interface returned will be marshalled into JSON to be sent to the client,
// unless the interface is []byte in which case the bytes are sent to the client unchanged.
// If an error is returned, a JSON error response will also be returned, unless the error code
// is a 302 REDIRECT in which case a redirect is sent based on the Message field.
type JSONRequestHandler interface {
OnIncomingRequest(req *http.Request) (interface{}, *HTTPError)
}
// JSONError represents a JSON API error response
type JSONError struct {
Message string `json:"message"`
}
// Protect panicking HTTP requests from taking down the entire process, and log them using
// the correct logger, returning a 500 with a JSON response rather than abruptly closing the
// connection. The http.Request MUST have a CtxValueLogger.
func Protect(handler http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, req *http.Request) {
defer func() {
if r := recover(); r != nil {
logger := req.Context().Value(CtxValueLogger).(*log.Entry)
logger.WithFields(log.Fields{
"panic": r,
}).Errorf(
"Request panicked!\n%s", debug.Stack(),
)
jsonErrorResponse(
w, req, &HTTPError{nil, "Internal Server Error", 500},
)
}
}()
handler(w, req)
}
}
// MakeJSONAPI creates an HTTP handler which always responds to incoming requests with JSON responses.
// Incoming http.Requests will have a logger (with a request ID/method/path logged) attached to the Context.
// This can be accessed via the const CtxValueLogger. The type of the logger is *log.Entry from github.com/Sirupsen/logrus
func MakeJSONAPI(handler JSONRequestHandler) http.HandlerFunc {
return Protect(func(w http.ResponseWriter, req *http.Request) {
// Set a Logger on the context
ctx := context.WithValue(req.Context(), CtxValueLogger, log.WithFields(log.Fields{
"req.method": req.Method,
"req.path": req.URL.Path,
"req.id": RandomString(12),
}))
req = req.WithContext(ctx)
logger := req.Context().Value(CtxValueLogger).(*log.Entry)
logger.Print("Incoming request")
res, httpErr := handler.OnIncomingRequest(req)
// Set common headers returned regardless of the outcome of the request
w.Header().Set("Content-Type", "application/json")
SetCORSHeaders(w)
if httpErr != nil {
jsonErrorResponse(w, req, httpErr)
return
}
// if they've returned bytes as the response, then just return them rather than marshalling as JSON.
// This gives handlers an escape hatch if they want to return cached bytes.
var resBytes []byte
resBytes, ok := res.([]byte)
if !ok {
r, err := json.Marshal(res)
if err != nil {
jsonErrorResponse(w, req, &HTTPError{nil, "Failed to serialise response as JSON", 500})
return
}
resBytes = r
}
logger.Print(fmt.Sprintf("Responding (%d bytes)", len(resBytes)))
w.Write(resBytes)
})
}
func jsonErrorResponse(w http.ResponseWriter, req *http.Request, httpErr *HTTPError) {
logger := req.Context().Value(CtxValueLogger).(*log.Entry)
if httpErr.Code == 302 {
logger.WithField("err", httpErr.Error()).Print("Redirecting")
http.Redirect(w, req, httpErr.Message, 302)
return
}
logger.WithFields(log.Fields{
log.ErrorKey: httpErr,
}).Print("Responding with error")
w.WriteHeader(httpErr.Code) // Set response code
r, err := json.Marshal(&JSONError{
Message: httpErr.Message,
})
if err != nil {
// We should never fail to marshal the JSON error response, but in this event just skip
// marshalling altogether
logger.Warn("Failed to marshal error response")
w.Write([]byte(`{}`))
return
}
w.Write(r)
}
// WithCORSOptions intercepts all OPTIONS requests and responds with CORS headers. The request handler
// is not invoked when this happens.
func WithCORSOptions(handler http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, req *http.Request) {
if req.Method == "OPTIONS" {
SetCORSHeaders(w)
return
}
handler(w, req)
}
}
// SetCORSHeaders sets unrestricted origin Access-Control headers on the response writer
func SetCORSHeaders(w http.ResponseWriter) {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
w.Header().Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept")
}
const alphanumerics = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
// RandomString generates a pseudo-random string of length n.
func RandomString(n int) string {
b := make([]byte, n)
for i := range b {
b[i] = alphanumerics[rand.Int63()%int64(len(alphanumerics))]
}
return string(b)
}

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package util
import (
"context"
"net/http"
"net/http/httptest"
"testing"
log "github.com/Sirupsen/logrus"
)
type MockJSONRequestHandler struct {
handler func(req *http.Request) (interface{}, *HTTPError)
}
func (h *MockJSONRequestHandler) OnIncomingRequest(req *http.Request) (interface{}, *HTTPError) {
return h.handler(req)
}
type MockResponse struct {
Foo string `json:"foo"`
}
func TestMakeJSONAPI(t *testing.T) {
log.SetLevel(log.PanicLevel) // suppress logs in test output
tests := []struct {
Return interface{}
Err *HTTPError
ExpectCode int
ExpectJSON string
}{
{nil, &HTTPError{nil, "Everything is broken", 500}, 500, `{"message":"Everything is broken"}`}, // Error return values
{nil, &HTTPError{nil, "Not here", 404}, 404, `{"message":"Not here"}`}, // With different status codes
{&MockResponse{"yep"}, nil, 200, `{"foo":"yep"}`}, // Success return values
{[]MockResponse{{"yep"}, {"narp"}}, nil, 200, `[{"foo":"yep"},{"foo":"narp"}]`}, // Top-level array success values
{[]byte(`actually bytes`), nil, 200, `actually bytes`}, // raw []byte escape hatch
{func(cannotBe, marshalled string) {}, nil, 500, `{"message":"Failed to serialise response as JSON"}`}, // impossible marshal
}
for _, tst := range tests {
mock := MockJSONRequestHandler{func(req *http.Request) (interface{}, *HTTPError) {
return tst.Return, tst.Err
}}
mockReq, _ := http.NewRequest("GET", "http://example.com/foo", nil)
mockWriter := httptest.NewRecorder()
handlerFunc := MakeJSONAPI(&mock)
handlerFunc(mockWriter, mockReq)
if mockWriter.Code != tst.ExpectCode {
t.Errorf("TestMakeJSONAPI wanted HTTP status %d, got %d", tst.ExpectCode, mockWriter.Code)
}
actualBody := mockWriter.Body.String()
if actualBody != tst.ExpectJSON {
t.Errorf("TestMakeJSONAPI wanted body '%s', got '%s'", tst.ExpectJSON, actualBody)
}
}
}
func TestMakeJSONAPIRedirect(t *testing.T) {
log.SetLevel(log.PanicLevel) // suppress logs in test output
mock := MockJSONRequestHandler{func(req *http.Request) (interface{}, *HTTPError) {
return nil, &HTTPError{nil, "https://matrix.org", 302}
}}
mockReq, _ := http.NewRequest("GET", "http://example.com/foo", nil)
mockWriter := httptest.NewRecorder()
handlerFunc := MakeJSONAPI(&mock)
handlerFunc(mockWriter, mockReq)
if mockWriter.Code != 302 {
t.Errorf("TestMakeJSONAPIRedirect wanted HTTP status 302, got %d", mockWriter.Code)
}
location := mockWriter.Header().Get("Location")
if location != "https://matrix.org" {
t.Errorf("TestMakeJSONAPIRedirect wanted Location header 'https://matrix.org', got '%s'", location)
}
}
func TestProtect(t *testing.T) {
log.SetLevel(log.PanicLevel) // suppress logs in test output
mockWriter := httptest.NewRecorder()
mockReq, _ := http.NewRequest("GET", "http://example.com/foo", nil)
mockReq = mockReq.WithContext(
context.WithValue(mockReq.Context(), CtxValueLogger, log.WithField("test", "yep")),
)
h := Protect(func(w http.ResponseWriter, req *http.Request) {
panic("oh noes!")
})
h(mockWriter, mockReq)
expectCode := 500
if mockWriter.Code != expectCode {
t.Errorf("TestProtect wanted HTTP status %d, got %d", expectCode, mockWriter.Code)
}
expectBody := `{"message":"Internal Server Error"}`
actualBody := mockWriter.Body.String()
if actualBody != expectBody {
t.Errorf("TestProtect wanted body %s, got %s", expectBody, actualBody)
}
}