58 lines
1.6 KiB
Go
58 lines
1.6 KiB
Go
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// Copyright 2017 Google Inc. All Rights Reserved.
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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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// +build go1.7
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package trace_test
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import (
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"log"
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"net/http"
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"cloud.google.com/go/trace"
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)
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var traceClient *trace.Client
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func ExampleHTTPClient_Do() {
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client := http.Client{
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Transport: &trace.Transport{},
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}
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span := traceClient.NewSpan("/foo") // traceClient is a *trace.Client
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req, _ := http.NewRequest("GET", "https://metadata/users", nil)
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req = req.WithContext(trace.NewContext(req.Context(), span))
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if _, err := client.Do(req); err != nil {
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log.Fatal(err)
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}
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}
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func ExampleClient_HTTPHandler() {
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handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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client := http.Client{
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Transport: &trace.Transport{},
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}
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req, _ := http.NewRequest("GET", "https://metadata/users", nil)
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req = req.WithContext(r.Context())
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// The outgoing request will be traced with r's trace ID.
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if _, err := client.Do(req); err != nil {
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log.Fatal(err)
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}
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})
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http.Handle("/foo", traceClient.HTTPHandler(handler)) // traceClient is a *trace.Client
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}
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