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83935b2558
* add propagation api. * add http propagator interface and w3c propagator implementation. * remove Extract api from trace. * remove Extract interface for tracer. * fix copyright. * fix variable names and comments. * move inject/extract out of trace. * replace INVALID_SPAN_CONTEXT with EmptySpanContext function. * fix tag.Map. * make carrier as interface instead of http.Request. * rename structs and update doc comments.. * add doc.go * update doc. * add noop propagator. * add new propagation api with Supplier interface. - added Default Tracer which simply propagates SpanContext. - added CopyOfRemote option to simply create remote span. * remove old propagator. * rename propagator to TextFormatPropagator. * rename default tracer/span as pass_through tracer/span. * add test for pass through tracer. * add missing interface to pass through tracer. * return SpanContext instead of contex.Context from Extract interface. - also remove PassThroughTracer * fix review comments. * add more test cases for traceContext extraction. * remove tidy temporarily from circle-ci target to avoid build failure. * allow header ending in dash '-'. * add inject test for non-zero value other than 01 for traceoption * add AddLink and Link interface to MockSpan * fix running go mod tidy on every build.
63 lines
1.5 KiB
Go
63 lines
1.5 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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"net/http"
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"go.opentelemetry.io/api/key"
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"go.opentelemetry.io/api/tag"
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"go.opentelemetry.io/api/trace"
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"go.opentelemetry.io/plugin/httptrace"
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)
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var (
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tracer = trace.GlobalTracer().
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WithService("server").
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WithComponent("main").
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WithResources(
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key.New("whatevs").String("nooooo"),
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)
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)
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func main() {
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helloHandler := func(w http.ResponseWriter, req *http.Request) {
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attrs, tags, spanCtx := httptrace.Extract(req.Context(), req)
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req = req.WithContext(tag.WithMap(req.Context(), tag.NewMap(tag.MapUpdate{
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MultiKV: tags,
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})))
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ctx, span := tracer.Start(
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req.Context(),
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"hello",
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trace.WithAttributes(attrs...),
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trace.ChildOf(spanCtx),
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)
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defer span.Finish()
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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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