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https://github.com/open-telemetry/opentelemetry-go.git
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8ebc7bbad0
It would be nice to follow a single schema for naming context functions. In the trace package we followed the form FooFromContext and ContextWithFoo. Do the same in the correlation package. The schema WithFoo is mainly used for functions following the options pattern. Not sure about a name of the NewContext function, though. For now I have left it alone. Co-authored-by: Rahul Patel <rghetia@yahoo.com>
83 lines
2.3 KiB
Go
83 lines
2.3 KiB
Go
// Copyright 2019, OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"io"
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"log"
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"net/http"
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"os"
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"go.opentelemetry.io/otel/api/correlation"
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"go.opentelemetry.io/otel/api/global"
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"go.opentelemetry.io/otel/api/trace"
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"go.opentelemetry.io/otel/exporter/trace/stackdriver"
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"go.opentelemetry.io/otel/plugin/httptrace"
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sdktrace "go.opentelemetry.io/otel/sdk/trace"
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)
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func initTracer() {
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projectID := os.Getenv("PROJECT_ID")
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// Create Stackdriver exporter to be able to retrieve
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// the collected spans.
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exporter, err := stackdriver.NewExporter(
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stackdriver.WithProjectID(projectID),
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)
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if err != nil {
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log.Fatal(err)
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}
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// For the demonstration, use sdktrace.AlwaysSample sampler to sample all traces.
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// In a production application, use sdktrace.ProbabilitySampler with a desired probability.
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tp, err := sdktrace.NewProvider(sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
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sdktrace.WithSyncer(exporter))
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if err != nil {
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log.Fatal(err)
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}
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global.SetTraceProvider(tp)
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}
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func main() {
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initTracer()
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tr := global.TraceProvider().Tracer("stackdriver/example/server")
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helloHandler := func(w http.ResponseWriter, req *http.Request) {
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attrs, entries, spanCtx := httptrace.Extract(req.Context(), req)
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req = req.WithContext(correlation.ContextWithMap(req.Context(), correlation.NewMap(correlation.MapUpdate{
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MultiKV: entries,
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})))
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ctx, span := tr.Start(
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trace.ContextWithRemoteSpanContext(req.Context(), spanCtx),
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"hello",
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trace.WithAttributes(attrs...),
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)
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defer span.End()
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span.AddEvent(ctx, "handling this...")
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_, _ = io.WriteString(w, "Hello, world!\n")
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}
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http.HandleFunc("/hello", helloHandler)
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err := http.ListenAndServe(":7777", nil)
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if err != nil {
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panic(err)
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}
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}
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