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a776e95c61
* Merge two event methods in span API There was an agreement to get rid of the Event interface and consolidate the two methods for adding events into one. See #57. * Eliminate the use of the Event interface There is no need for the SDK to provide the implementation of the Event interface - it is used nowhere. * Drop the Event interface It's dead code now. * Make it possible to override a finish timestamp through options Opentracing to opentelemetry bridge will certainly use this feature. * Obey the start time option * Add tests for events and custom start/end times
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)
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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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