restic/vendor/cloud.google.com/go/trace/httpexample_test.go

58 lines
1.6 KiB
Go

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