From 2da84134b3dbb2b6d30187c79eb8b083b8789dd5 Mon Sep 17 00:00:00 2001 From: Kaspar Birk Date: Wed, 3 Aug 2022 10:48:21 +0200 Subject: [PATCH] initial --- .github/workflows/go.yaml | 21 ++ .gitignore | 3 + LICENSE | 20 ++ Makefile | 14 ++ README.md | 58 +++++ collector.go | 81 +++++++ examples/std/main.go | 28 +++ go.mod | 9 + go.sum | 474 ++++++++++++++++++++++++++++++++++++++ middleware.go | 68 ++++++ middleware_test.go | 62 +++++ options.go | 67 ++++++ response_writer.go | 27 +++ 13 files changed, 932 insertions(+) create mode 100644 .github/workflows/go.yaml create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 Makefile create mode 100644 README.md create mode 100644 collector.go create mode 100644 examples/std/main.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 middleware.go create mode 100644 middleware_test.go create mode 100644 options.go create mode 100644 response_writer.go diff --git a/.github/workflows/go.yaml b/.github/workflows/go.yaml new file mode 100644 index 0000000..e624d94 --- /dev/null +++ b/.github/workflows/go.yaml @@ -0,0 +1,21 @@ +name: Go +on: + push: + branches: [main] + pull_request: + branches: [main] +jobs: + test: + name: Test + runs-on: ubuntu-latest + steps: + - name: Install go + uses: actions/setup-go@v2 + with: + go-version: 1.16 + + - name: Checkout code + uses: actions/checkout@v2 + + - name: Test + run: make test \ No newline at end of file diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..5c284de --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +.idea +vendor +cover.* diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..9a825a5 --- /dev/null +++ b/LICENSE @@ -0,0 +1,20 @@ +The MIT License (MIT) + +Copyright (c) 2022 Kaspar Birk + +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of +the Software, and to permit persons to whom the Software is furnished to do so, +subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS +FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR +COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER +IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. \ No newline at end of file diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..f762671 --- /dev/null +++ b/Makefile @@ -0,0 +1,14 @@ +GOWORK=off + +build: + @go build ./... + +cover: + @go test -coverprofile=cover.out -covermode=atomic -coverpkg=./... ./... + @go tool cover -html=cover.out -o cover.html + +test: + @go test ./... -v + +doc: + @godoc -http=:6060 \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..3af9aa5 --- /dev/null +++ b/README.md @@ -0,0 +1,58 @@ +# promware [![Test Status](https://github.com/imbue11235/promware/workflows/Go/badge.svg)](https://github.com/imbue11235/promware/actions?query=workflow:Go) [![Go Reference](https://pkg.go.dev/badge/github.com/imbue11235/promware.svg)](https://pkg.go.dev/github.com/imbue11235/promware) + +> A simple, configurable middleware for recording request metrics with [Prometheus](https://github.com/prometheus/prometheus) + +## 🛠 Installation + +Make sure to have Go installed (Version `1.16` or higher). + +Install `promware` with `go get`: + +```sh +$ go get -u github.com/imbue11235/promware +``` + +## 💻 Usage + +### With standard library + +```go +middleware := promware.Default() + +handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusOK) + fmt.Fprintln(w, "hello world") +}) + +mux := http.NewServeMux() +mux.Handle("/metrics", promhttp.Handler()) +mux.Handle("/", middleware(handler)) + +http.ListenAndServe("", mux) +``` + +### Options +```go +middleware := promware.New( + // Skip depending on request data + promware.WithSkipFunc(func(r *http.Request) bool { + return r.URL.Path == "/something" + }) + + // Set subsystem + promware.WithSubsystem("my-subsystem") + + // Set namespace + promware.WithNamespace("my-namespace") + + // Add request counter, set name + promware.WithRequestCounter("total-requests") + + // Add latency histogram, set name and buckets + promware.WithLatencyHistogram("request-latency", []float64{0.5, 1, 2}) +) +``` + +## 📜 License + +This project is licensed under the [MIT license](LICENSE). \ No newline at end of file diff --git a/collector.go b/collector.go new file mode 100644 index 0000000..6f9d206 --- /dev/null +++ b/collector.go @@ -0,0 +1,81 @@ +package promware + +import ( + "github.com/prometheus/client_golang/prometheus" + "net/http" +) + +const defaultMetricsPath = "/metrics" + +// SkipFunc allows for certain requests to be skipped +// based on information obtained from the http.Request, e.g. URLPath. +type SkipFunc func(r *http.Request) bool + +// collector holds information and collectors needed by prometheus +type collector struct { + namespace string + subsystem string + + requestCounter *prometheus.CounterVec + latencyHistogram *prometheus.HistogramVec + + shouldSkip SkipFunc +} + +// newCollector creates a new collector with empty values +func newCollector() *collector { + return &collector{ + namespace: "", + subsystem: "", + shouldSkip: func(r *http.Request) bool { + // default skips on `/metrics` endpoint, which + // is commonly used with Prometheus + return r.URL.Path == defaultMetricsPath + }, + } +} + +// apply adds options to the recorder +func (c *collector) apply(options ...option) { + for _, opt := range options { + opt(c) + } +} + +// register registers all the prometheus.Collectors +func (c *collector) register() error { + collectors := []prometheus.Collector{ + c.requestCounter, + c.latencyHistogram, + } + + for _, collector := range collectors { + if collector == nil { + continue + } + + if err := prometheus.Register(collector); err != nil { + return err + } + } + + return nil +} + +// addObservationToLatencyHistogram adds an observation to the latency histogram collector +func (c *collector) addObservationToLatencyHistogram(code, method, path string, seconds float64) { + if c.latencyHistogram == nil { + return + } + + c.latencyHistogram.WithLabelValues(code, method, path).Observe(seconds) +} + +// incrementRequestCounter increments the current request counter collector by 1 +func (c *collector) incrementRequestCounter(code, method, path string) { + if c.requestCounter == nil { + return + } + + c.requestCounter.WithLabelValues(code, method, path).Inc() +} diff --git a/examples/std/main.go b/examples/std/main.go new file mode 100644 index 0000000..4b338aa --- /dev/null +++ b/examples/std/main.go @@ -0,0 +1,28 @@ +package main + +import ( + "fmt" + "github.com/imbue11235/promware" + "github.com/prometheus/client_golang/prometheus/promhttp" + "log" + "net/http" +) + +func main() { + addr := ":8080" + + middleware := promware.Default() + + handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusOK) + fmt.Fprintln(w, "hello world") + }) + + mux := http.NewServeMux() + mux.Handle("/metrics", promhttp.Handler()) + mux.Handle("/", middleware(handler)) + + log.Printf("Serving on addr %s", addr) + + http.ListenAndServe(addr, mux) +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..8b5ca21 --- /dev/null +++ b/go.mod @@ -0,0 +1,9 @@ +module github.com/imbue11235/promware + +go 1.16 + +require ( + github.com/appleboy/gofight/v2 v2.1.2 // indirect + github.com/prometheus/client_golang v1.12.2 + github.com/stretchr/testify v1.8.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..cb0c09f --- /dev/null +++ b/go.sum @@ -0,0 +1,474 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go 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h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= +honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= +rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= +rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0= +rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= diff --git a/middleware.go b/middleware.go new file mode 100644 index 0000000..04244c3 --- /dev/null +++ b/middleware.go @@ -0,0 +1,68 @@ +package promware + +import ( + "log" + "net/http" + "strconv" + "strings" + "time" +) + +// Middleware is responsible for creating a middleware handler func +type Middleware func(next http.Handler) http.Handler + +// New creates a new prometheus middleware from given +// options. +// Note: the middleware has no prometheus collectors attached +// per default. If you want the default collectors, use Default +func New(options ...option) Middleware { + col := newCollector() + col.apply(options...) + + if err := col.register(); err != nil { + log.Println("could not register collectors", err) + + return func(next http.Handler) http.Handler { + return next + } + } + + return func(next http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + start := time.Now() + + // create a delegate response writer + rw := newResponseWriter(w) + + // call next handler + next.ServeHTTP(rw, r) + + if col.shouldSkip(r) { + return + } + + // record the elapsed time + elapsed := float64(time.Since(start)) / float64(time.Second) + + // get the URL path + path := r.URL.Path + + // ensure method is uppercase, e.g. "GET", "POST" etc. + method := strings.ToUpper(r.Method) + + // convert HTTP status code to a string for usage with prometheus + code := strconv.Itoa(rw.Status()) + + go col.incrementRequestCounter(code, method, path) + go col.addObservationToLatencyHistogram(code, method, path, elapsed) + }) + } +} + +// Default creates a new middleware with default collectors attached +func Default() Middleware { + return New( + WithDefaultLatencyHistogram(), + WithDefaultRequestCounter(), + ) +} diff --git a/middleware_test.go b/middleware_test.go new file mode 100644 index 0000000..850e9af --- /dev/null +++ b/middleware_test.go @@ -0,0 +1,62 @@ +package promware + +import ( + "fmt" + "github.com/appleboy/gofight/v2" + "github.com/prometheus/client_golang/prometheus/promhttp" + "github.com/stretchr/testify/assert" + "net/http" + "testing" +) + +func TestMiddleware(t *testing.T) { + middleware := Default() + + routes := []struct { + path string + handler http.Handler + }{ + { + path: "/metrics", + handler: promhttp.Handler(), + }, + { + path: "/", + handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusOK) + fmt.Fprint(w, "hello world") + }), + }, + { + path: "/other", + handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusBadRequest) + fmt.Fprint(w, "no") + }), + }, + } + + mux := http.NewServeMux() + for _, route := range routes { + mux.Handle(route.path, middleware(route.handler)) + } + + r := gofight.New() + r.GET("/").Run(mux, func(rsp gofight.HTTPResponse, req gofight.HTTPRequest) { + assert.Equal(t, "hello world", rsp.Body.String()) + assert.Equal(t, http.StatusOK, rsp.Code) + }) + + r.GET("/metrics").Run(mux, func(rsp gofight.HTTPResponse, req gofight.HTTPRequest) { + assert.Equal(t, http.StatusOK, rsp.Code) + body := rsp.Body.String() + + assert.Contains(t, body, "request_duration_seconds") + assert.Contains(t, body, "requests_total{code=\"200\",method=\"GET\",url=\"/\"} 1") + // metrics endpoints should be skipped + assert.NotContains(t, body, "requests_total{code=\"200\",method=\"GET\",url=\"/metrics\"} 1") + // other was never called, and should be skipped + assert.NotContains(t, body, "requests_total{code=\"200\",method=\"GET\",url=\"/other\"} 1") + }) + +} diff --git a/options.go b/options.go new file mode 100644 index 0000000..a7fcb20 --- /dev/null +++ b/options.go @@ -0,0 +1,67 @@ +package promware + +import "github.com/prometheus/client_golang/prometheus" + +// option alters the recorder struct +type option func(c *collector) + +func WithSkipFunc(skipFunc SkipFunc) option { + return func(c *collector) { + c.shouldSkip = skipFunc + } +} + +// WithNamespace sets the namespace of the prometheus collectors +func WithNamespace(namespace string) option { + return func(c *collector) { + c.namespace = namespace + } +} + +// WithSubsystem sets the subsystem of the prometheus collectors +func WithSubsystem(name string) option { + return func(c *collector) { + c.subsystem = name + } +} + +// WithRequestCounter creates a new request counter collector with a given name +func WithRequestCounter(name string) option { + return func(c *collector) { + c.requestCounter = prometheus.NewCounterVec( + prometheus.CounterOpts{ + Namespace: c.namespace, + Subsystem: c.subsystem, + Name: name, + Help: "How many HTTP requests processed, partitioned by status code and HTTP method.", + }, + []string{"code", "method", "url"}, + ) + } +} + +// WithDefaultRequestCounter creates a request counter with the default name `requests_total` +func WithDefaultRequestCounter() option { + return WithRequestCounter("requests_total") +} + +// WithLatencyHistogram creates a latency histogram collector with a given name +func WithLatencyHistogram(name string, buckets []float64) option { + return func(c *collector) { + c.latencyHistogram = prometheus.NewHistogramVec( + prometheus.HistogramOpts{ + Namespace: c.namespace, + Subsystem: c.subsystem, + Name: name, + Help: "How long it took to process the request in seconds, partitioned by status code, method and HTTP path.", + Buckets: buckets, + }, + []string{"code", "method", "url"}, + ) + } +} + +// WithDefaultLatencyHistogram creates a latency histogram collector with the name `request_duration_seconds` +func WithDefaultLatencyHistogram() option { + return WithLatencyHistogram("request_duration_seconds", prometheus.DefBuckets) +} diff --git a/response_writer.go b/response_writer.go new file mode 100644 index 0000000..ac02436 --- /dev/null +++ b/response_writer.go @@ -0,0 +1,27 @@ +package promware + +import "net/http" + +// responseWriter is an extension of the http.ResponseWriter which +// enables us to save the statusCode written from a handler func further +// down the chain +type responseWriter struct { + http.ResponseWriter + statusCode int +} + +func newResponseWriter(w http.ResponseWriter) *responseWriter { + return &responseWriter{ResponseWriter: w} +} + +// WriteHeader saves the status code for later usage +// and calls the original ResponseWriter's WriteHeader method +func (w *responseWriter) WriteHeader(statusCode int) { + w.statusCode = statusCode + w.ResponseWriter.WriteHeader(statusCode) +} + +// Status returns the status code +func (w *responseWriter) Status() int { + return w.statusCode +}