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Po-Yao Chen
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| package otellib | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "log" | ||
| "net/http" | ||
| "runtime/debug" | ||
|
|
||
| "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp" | ||
| "go.opentelemetry.io/otel" | ||
| "go.opentelemetry.io/otel/attribute" | ||
| "go.opentelemetry.io/otel/metric" | ||
| semconv "go.opentelemetry.io/otel/semconv/v1.20.0" | ||
| ) | ||
|
|
||
| const scopeName = "github.com/theparanoids/crypki/otellib" | ||
|
|
||
| const handlerPanic = "http.handler.panic" | ||
|
|
||
| type httpMiddleware struct { | ||
| next http.Handler | ||
| meter metric.Meter | ||
|
|
||
| panicCounter metric.Int64Counter | ||
| } | ||
|
|
||
| // NewHTTPMiddleware wraps an http.Handler with OpenTelemetry instrumentation. | ||
| func NewHTTPMiddleware(handler http.Handler, operation string) http.Handler { | ||
| h := newHTTPMiddleware(handler) | ||
| return otelhttp.NewHandler(h, operation) | ||
| } | ||
|
|
||
| func newHTTPMiddleware(nextHandler http.Handler) *httpMiddleware { | ||
| middleware := &httpMiddleware{ | ||
| next: nextHandler, | ||
| } | ||
| middleware.meter = otel.GetMeterProvider().Meter(scopeName) | ||
|
|
||
| var err error | ||
| if middleware.panicCounter, err = middleware.meter.Int64Counter( | ||
| handlerPanic, | ||
| metric.WithUnit("1"), | ||
| metric.WithDescription("Count the number of HTTP handler panic"), | ||
| ); err != nil { | ||
| otel.Handle(err) | ||
| } | ||
|
|
||
| return middleware | ||
| } | ||
|
|
||
| // ServeHTTP implements http.Handler. | ||
| func (h *httpMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
| // A labeler is always available in the request context by otelhttp package. | ||
| labeler, _ := otelhttp.LabelerFromContext(r.Context()) | ||
| // Add the http.target attribute to the OTel labeler. | ||
| if r.URL != nil { | ||
| labeler.Add(semconv.HTTPTargetKey.String(r.URL.RequestURI())) | ||
| } | ||
| defer func() { | ||
| if rec := recover(); rec != nil { | ||
| log.Printf(`panic captured, %v, %v`, string(debug.Stack()), rec) | ||
|
|
||
| ctx := r.Context() | ||
| labels := append(labeler.Get(), []attribute.KeyValue{ | ||
| attribute.String("http.method", r.Method), | ||
| attribute.String("panic.message", fmt.Sprintf("%v", rec)), | ||
| }...) | ||
| h.panicCounter.Add(ctx, 1, metric.WithAttributes(labels...)) | ||
| http.Error(w, "Internal Server Error", http.StatusInternalServerError) | ||
| } | ||
| }() | ||
| h.next.ServeHTTP(w, r) | ||
| } |
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