From c81f33b702a99f60cf2b0fa21c64391eb9d24171 Mon Sep 17 00:00:00 2001 From: kun Date: Tue, 9 Mar 2021 11:32:17 +0800 Subject: [PATCH] feat: support prometheus metrics in router --- go.mod | 1 + go.sum | 391 ++++++++++++++++++++++++++++++++++++++++++++++- main.go | 10 +- proxy/metrics.go | 43 ++++++ proxy/router.go | 34 +++-- 5 files changed, 466 insertions(+), 13 deletions(-) create mode 100644 proxy/metrics.go diff --git a/go.mod b/go.mod index 564657d..7b464fc 100644 --- a/go.mod +++ b/go.mod @@ -4,5 +4,6 @@ go 1.12 require ( github.com/goproxyio/windows v0.0.0-20191126033816-f4a809841617 + github.com/prometheus/client_golang v1.9.0 golang.org/x/mod v0.4.0 ) diff --git a/go.sum b/go.sum index 171cff7..c4cf10e 100644 --- a/go.sum +++ b/go.sum @@ -1,16 +1,405 @@ +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= +github.com/BurntSushi/toml v0.3.1/go.mod 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h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= +sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o= +sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU= diff --git a/main.go b/main.go index 2c07154..21f8b79 100644 --- a/main.go +++ b/main.go @@ -35,6 +35,7 @@ import ( "github.com/goproxyio/goproxy/v2/proxy" + "github.com/prometheus/client_golang/prometheus/promhttp" "golang.org/x/mod/module" ) @@ -42,7 +43,7 @@ var downloadRoot string const listExpire = proxy.ListExpire -var listen string +var listen, promListen string var cacheDir string var proxyHost string var excludeHost string @@ -166,6 +167,13 @@ func (r *responseLogger) WriteHeader(code int) { // ServeHTTP implements http handler. func (l *logger) ServeHTTP(w http.ResponseWriter, r *http.Request) { + + // Prometheus metrics + if r.URL.Path == "/metrics" { + promhttp.Handler().ServeHTTP(w, r) + return + } + start := time.Now() rl := &responseLogger{code: 200, ResponseWriter: w} l.h.ServeHTTP(rl, r) diff --git a/proxy/metrics.go b/proxy/metrics.go new file mode 100644 index 0000000..bb5092e --- /dev/null +++ b/proxy/metrics.go @@ -0,0 +1,43 @@ +package proxy + +import ( + "fmt" + "net/http" + + "github.com/prometheus/client_golang/prometheus" +) + +var ( + totalRequest = prometheus.NewCounterVec(prometheus.CounterOpts{ + Namespace: "goproxy", + Subsystem: "router", + Name: "request_total", + Help: "total request in HTTP", + }, []string{"mode", "status"}) +) + +func init() { + prometheus.MustRegister(totalRequest) +} + +type metricsResponseWriter struct { + http.ResponseWriter + statusCode int +} + +func (mw metricsResponseWriter) status() string { + return fmt.Sprintf("%d", mw.statusCode) +} + +// NewMetricsResponseWriter creates custom metrics response writer. +func NewMetricsResponseWriter(w http.ResponseWriter) *metricsResponseWriter { + // WriteHeader(int) is not called if our response implicitly returns 0, so + // we default to that status code. + return &metricsResponseWriter{w, 0} +} + +// WriteHeader implements http.ResponseWriter. +func (mw *metricsResponseWriter) WriteHeader(code int) { + mw.statusCode = code + mw.ResponseWriter.WriteHeader(code) +} diff --git a/proxy/router.go b/proxy/router.go index 8780fe4..3a7e498 100644 --- a/proxy/router.go +++ b/proxy/router.go @@ -18,6 +18,8 @@ import ( "github.com/goproxyio/goproxy/v2/renameio" "github.com/goproxyio/goproxy/v2/sumdb" + + "github.com/prometheus/client_golang/prometheus" ) // ListExpire list data expire data duration. @@ -167,15 +169,18 @@ func (rt *Router) Direct(path string) bool { // ServveHTTP implements http handler. func (rt *Router) ServeHTTP(w http.ResponseWriter, r *http.Request) { + mw := NewMetricsResponseWriter(w) // sumdb handler if strings.HasPrefix(r.URL.Path, "/sumdb/") { - sumdb.Handler(w, r) + sumdb.Handler(mw, r) + totalRequest.With(prometheus.Labels{"mode": "sumdb", "status": mw.status()}).Inc() return } if rt.proxy == nil || rt.Direct(strings.TrimPrefix(r.URL.Path, "/")) { log.Printf("------ --- %s [direct]\n", r.URL) - rt.srv.ServeHTTP(w, r) + rt.srv.ServeHTTP(mw, r) + totalRequest.With(prometheus.Labels{"mode": "direct", "status": mw.status()}).Inc() return } @@ -187,19 +192,22 @@ func (rt *Router) ServeHTTP(w http.ResponseWriter, r *http.Request) { if strings.HasSuffix(r.URL.Path, "/@latest") { if time.Since(info.ModTime()) >= ListExpire { log.Printf("------ --- %s [proxy]\n", r.URL) - rt.proxy.ServeHTTP(w, r) + rt.proxy.ServeHTTP(mw, r) + totalRequest.With(prometheus.Labels{"mode": "proxy", "status": mw.status()}).Inc() } else { ctype = "text/plain; charset=UTF-8" - w.Header().Set("Content-Type", ctype) + mw.Header().Set("Content-Type", ctype) log.Printf("------ --- %s [cached]\n", r.URL) - http.ServeContent(w, r, "", info.ModTime(), f) + http.ServeContent(mw, r, "", info.ModTime(), f) + totalRequest.With(prometheus.Labels{"mode": "cached", "status": mw.status()}).Inc() } return } i := strings.Index(r.URL.Path, "/@v/") if i < 0 { - http.Error(w, "no such path", http.StatusNotFound) + http.Error(mw, "no such path", http.StatusNotFound) + totalRequest.With(prometheus.Labels{"mode": "proxy", "status": mw.status()}).Inc() return } @@ -207,7 +215,8 @@ func (rt *Router) ServeHTTP(w http.ResponseWriter, r *http.Request) { if what == "list" { if time.Since(info.ModTime()) >= ListExpire { log.Printf("------ --- %s [proxy]\n", r.URL) - rt.proxy.ServeHTTP(w, r) + rt.proxy.ServeHTTP(mw, r) + totalRequest.With(prometheus.Labels{"mode": "proxy", "status": mw.status()}).Inc() return } ctype = "text/plain; charset=UTF-8" @@ -221,18 +230,21 @@ func (rt *Router) ServeHTTP(w http.ResponseWriter, r *http.Request) { case ".zip": ctype = "application/octet-stream" default: - http.Error(w, "request not recognized", http.StatusNotFound) + http.Error(mw, "request not recognized", http.StatusNotFound) + totalRequest.With(prometheus.Labels{"mode": "proxy", "status": mw.status()}).Inc() return } } - w.Header().Set("Content-Type", ctype) + mw.Header().Set("Content-Type", ctype) log.Printf("------ --- %s [cached]\n", r.URL) - http.ServeContent(w, r, "", info.ModTime(), f) + http.ServeContent(mw, r, "", info.ModTime(), f) + totalRequest.With(prometheus.Labels{"mode": "cached", "status": mw.status()}).Inc() return } } log.Printf("------ --- %s [proxy]\n", r.URL) - rt.proxy.ServeHTTP(w, r) + rt.proxy.ServeHTTP(mw, r) + totalRequest.With(prometheus.Labels{"mode": "proxy", "status": mw.status()}).Inc() return }