From 962310204f088a74719a48fa2dc76e76934dfa09 Mon Sep 17 00:00:00 2001 From: David Frickert Date: Wed, 25 Jan 2023 07:26:44 +0000 Subject: tracing: Support placeholders in span name (#5329) Fixes https://github.com/caddyserver/caddy/issues/5171 --- modules/caddyhttp/tracing/module_test.go | 14 +++++++++++--- modules/caddyhttp/tracing/tracer.go | 13 ++++++++++++- 2 files changed, 23 insertions(+), 4 deletions(-) (limited to 'modules') diff --git a/modules/caddyhttp/tracing/module_test.go b/modules/caddyhttp/tracing/module_test.go index 0fbc05b..2a775fc 100644 --- a/modules/caddyhttp/tracing/module_test.go +++ b/modules/caddyhttp/tracing/module_test.go @@ -98,7 +98,7 @@ func TestTracing_ServeHTTP_Propagation_Without_Initial_Headers(t *testing.T) { SpanName: "mySpan", } - req := httptest.NewRequest("GET", "https://example.com/foo", nil) + req := createRequestWithContext("GET", "https://example.com/foo") w := httptest.NewRecorder() var handler caddyhttp.HandlerFunc = func(writer http.ResponseWriter, request *http.Request) error { @@ -128,7 +128,7 @@ func TestTracing_ServeHTTP_Propagation_With_Initial_Headers(t *testing.T) { SpanName: "mySpan", } - req := httptest.NewRequest("GET", "https://example.com/foo", nil) + req := createRequestWithContext("GET", "https://example.com/foo") req.Header.Set("traceparent", "00-11111111111111111111111111111111-1111111111111111-01") w := httptest.NewRecorder() @@ -159,7 +159,7 @@ func TestTracing_ServeHTTP_Next_Error(t *testing.T) { SpanName: "mySpan", } - req := httptest.NewRequest("GET", "https://example.com/foo", nil) + req := createRequestWithContext("GET", "https://example.com/foo") w := httptest.NewRecorder() expectErr := errors.New("test error") @@ -180,3 +180,11 @@ func TestTracing_ServeHTTP_Next_Error(t *testing.T) { t.Errorf("expected error, got: %v", err) } } + +func createRequestWithContext(method string, url string) *http.Request { + r, _ := http.NewRequest(method, url, nil) + repl := caddy.NewReplacer() + ctx := context.WithValue(r.Context(), caddy.ReplacerCtxKey, repl) + r = r.WithContext(ctx) + return r +} diff --git a/modules/caddyhttp/tracing/tracer.go b/modules/caddyhttp/tracing/tracer.go index ddb01e8..e5c5107 100644 --- a/modules/caddyhttp/tracing/tracer.go +++ b/modules/caddyhttp/tracing/tracer.go @@ -69,7 +69,13 @@ func newOpenTelemetryWrapper( sdktrace.WithResource(res), ) - ot.handler = otelhttp.NewHandler(http.HandlerFunc(ot.serveHTTP), ot.spanName, otelhttp.WithTracerProvider(tracerProvider), otelhttp.WithPropagators(ot.propagators)) + ot.handler = otelhttp.NewHandler(http.HandlerFunc(ot.serveHTTP), + ot.spanName, + otelhttp.WithTracerProvider(tracerProvider), + otelhttp.WithPropagators(ot.propagators), + otelhttp.WithSpanNameFormatter(ot.spanNameFormatter), + ) + return ot, nil } @@ -106,3 +112,8 @@ func (ot *openTelemetryWrapper) newResource( semconv.WebEngineVersionKey.String(webEngineVersion), )) } + +// spanNameFormatter performs the replacement of placeholders in the span name +func (ot *openTelemetryWrapper) spanNameFormatter(operation string, r *http.Request) string { + return r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer).ReplaceAll(operation, "") +} -- cgit v1.2.3