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trace.go
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trace.go
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/**
*
* (c) Copyright Ascensio System SIA 2023
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
// Package middleware provides http middlewares
//
// The middleware package's functions get added to http services automatically.
package middleware
import (
"net/http"
"go-micro.dev/v4/metadata"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/propagation"
)
const (
InstrumentationName = "github.com/go-micro/plugins/v4/wrapper/trace/opentelemetry"
)
// TracePropagationMiddleware inject previous context into a new request
func TracePropagationMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
carrier := propagation.MapCarrier{}
propagator := otel.GetTextMapPropagator()
ctx := propagator.Extract(r.Context(), carrier)
propagator.Inject(ctx, carrier)
next.ServeHTTP(w, r.WithContext(metadata.NewContext(ctx, metadata.Metadata(carrier))))
})
}
// LogTraceMiddleware starts tracing with spans
func LogTraceMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
carrier := propagation.MapCarrier{}
ctx, span := otel.GetTracerProvider().Tracer(InstrumentationName).Start(r.Context(), r.URL.Path)
defer span.End()
otel.GetTextMapPropagator().Inject(ctx, carrier)
next.ServeHTTP(w, r.WithContext(metadata.NewContext(ctx, metadata.Metadata(carrier))))
})
}