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feat: instrument http server and client
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| package app | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| "go.opentelemetry.io/otel/codes" | ||
| "go.opentelemetry.io/otel/propagation" | ||
| "go.opentelemetry.io/otel/trace" | ||
| "go.uber.org/zap" | ||
|
|
||
| "github.com/go-faster/simon/internal/middleware" | ||
| "github.com/go-faster/simon/internal/oas" | ||
| "github.com/go-faster/simon/sdk/zctx" | ||
| ) | ||
|
|
||
| type writerProxy struct { | ||
| http.ResponseWriter | ||
|
|
||
| wrote int64 | ||
| status int | ||
| } | ||
|
|
||
| func (w *writerProxy) Write(bytes []byte) (n int, err error) { | ||
| n, err = w.ResponseWriter.Write(bytes) | ||
| w.wrote += int64(n) | ||
| return n, err | ||
| } | ||
| func (w *writerProxy) WriteHeader(statusCode int) { | ||
| w.ResponseWriter.WriteHeader(statusCode) | ||
| w.status = statusCode | ||
| } | ||
|
|
||
| type Router interface { | ||
| FindRoute(method, path string) (oas.Route, bool) | ||
| } | ||
|
|
||
| func NewSpanNameFormatter(h Router) func(operation string, r *http.Request) string { | ||
| return func(operation string, r *http.Request) string { | ||
| route, ok := h.FindRoute(r.Method, r.URL.Path) | ||
| if !ok { | ||
| return operation | ||
| } | ||
| return route.OperationID() | ||
| } | ||
| } | ||
|
|
||
| // TraceMiddleware returns new instrumented middleware. | ||
| func (m *Metrics) TraceMiddleware() middleware.Middleware { | ||
| var ( | ||
| h = oas.Server{} | ||
| p = m.TextMapPropagator() | ||
| tp = m.TracerProvider() | ||
| ) | ||
| return func(next http.Handler) http.Handler { | ||
| t := tp.Tracer("http") | ||
| return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) { | ||
| start := time.Now() | ||
| w := &writerProxy{ResponseWriter: rw} | ||
|
|
||
| operation := "(Unknown)" | ||
| route, routeOk := h.FindRoute(r.Method, r.URL.Path) | ||
| if routeOk { | ||
| operation = route.OperationID() | ||
| } | ||
|
|
||
| ctx := p.Extract(r.Context(), propagation.HeaderCarrier(r.Header)) | ||
| ctx, span := t.Start(ctx, fmt.Sprintf("HTTP: %s", operation)) | ||
| defer span.End() | ||
| spanCtx := span.SpanContext() | ||
|
|
||
| // Use separate loggers for request logger (to log in defer) and | ||
| // context logger, because context logger should not contain | ||
| // trace_id and span_id to be able to change them for new | ||
| // spans. | ||
| lgCtx := m.lg | ||
| fields := []zap.Field{ | ||
| zap.Stringer("trace_id", spanCtx.TraceID()), | ||
| zap.Stringer("span_id", spanCtx.SpanID()), | ||
| } | ||
| if routeOk { | ||
| f := zap.String("op", operation) | ||
| fields = append(fields, f) | ||
| lgCtx = lgCtx.With(f) | ||
| } | ||
| lgReq := m.lg.With(fields...) | ||
| ctx = zctx.With(ctx, lgCtx) | ||
|
|
||
| defer func() { | ||
| if r := recover(); r != nil { | ||
| lgReq.Error("Panic", zap.Stack("stack")) | ||
| if w.status == 0 { | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| } | ||
| span.AddEvent("Panic recovered", | ||
| trace.WithStackTrace(true), | ||
| ) | ||
| span.SetStatus(codes.Error, "Panic recovered") | ||
| } | ||
| lgReq.Debug("Request", | ||
| zap.Duration("duration", time.Since(start)), | ||
| zap.Int("http.status", w.status), | ||
| zap.Int64("http.response.size", w.wrote), | ||
| zap.String("http.path", r.URL.String()), | ||
| zap.String("http.method", r.Method), | ||
| ) | ||
| }() | ||
|
|
||
| next.ServeHTTP(w, r.WithContext(ctx)) | ||
| }) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| // Package middleware is http middleware. | ||
| package middleware | ||
|
|
||
| import "net/http" | ||
|
|
||
| // Middleware is http middleware. | ||
| type Middleware func(next http.Handler) http.Handler | ||
|
|
||
| // Wrap Middleware. | ||
| func Wrap(h http.Handler, mw Middleware) http.Handler { | ||
| return mw(h) | ||
| } |