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79 lines
2.2 KiB
Go
79 lines
2.2 KiB
Go
package handler
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import (
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"net/http"
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"github.com/zeromicro/go-zero/core/collection"
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"github.com/zeromicro/go-zero/core/trace"
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"github.com/zeromicro/go-zero/rest/internal/response"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/propagation"
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semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
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oteltrace "go.opentelemetry.io/otel/trace"
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)
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type (
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// TraceOption defines the method to customize an traceOptions.
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TraceOption func(options *traceOptions)
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// traceOptions is TraceHandler options.
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traceOptions struct {
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traceIgnorePaths []string
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}
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)
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// TraceHandler return a middleware that process the opentelemetry.
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func TraceHandler(serviceName, path string, opts ...TraceOption) func(http.Handler) http.Handler {
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var options traceOptions
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for _, opt := range opts {
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opt(&options)
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}
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ignorePaths := collection.NewSet()
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ignorePaths.AddStr(options.traceIgnorePaths...)
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return func(next http.Handler) http.Handler {
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tracer := otel.Tracer(trace.TraceName)
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propagator := otel.GetTextMapPropagator()
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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spanName := path
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if len(spanName) == 0 {
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spanName = r.URL.Path
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}
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if ignorePaths.Contains(spanName) {
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next.ServeHTTP(w, r)
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return
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}
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ctx := propagator.Extract(r.Context(), propagation.HeaderCarrier(r.Header))
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spanCtx, span := tracer.Start(
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ctx,
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spanName,
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oteltrace.WithSpanKind(oteltrace.SpanKindServer),
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oteltrace.WithAttributes(semconv.HTTPServerAttributesFromHTTPRequest(
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serviceName, spanName, r)...),
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)
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defer span.End()
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// convenient for tracking error messages
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propagator.Inject(spanCtx, propagation.HeaderCarrier(w.Header()))
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trw := response.NewWithCodeResponseWriter(w)
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next.ServeHTTP(trw, r.WithContext(spanCtx))
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span.SetAttributes(semconv.HTTPAttributesFromHTTPStatusCode(trw.Code)...)
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span.SetStatus(semconv.SpanStatusFromHTTPStatusCodeAndSpanKind(
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trw.Code, oteltrace.SpanKindServer))
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})
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}
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}
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// WithTraceIgnorePaths specifies the traceIgnorePaths option for TraceHandler.
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func WithTraceIgnorePaths(traceIgnorePaths []string) TraceOption {
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return func(options *traceOptions) {
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options.traceIgnorePaths = append(options.traceIgnorePaths, traceIgnorePaths...)
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}
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}
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