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91e58afa55
We get some useful features in later versions; update so as to not pin downstream consumers (extensions) to an older version.
64 lines
1.7 KiB
Go
64 lines
1.7 KiB
Go
// Copyright 2018, OpenCensus 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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"fmt"
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"log"
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"net/http"
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"time"
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"go.opencensus.io/zpages"
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"go.opencensus.io/examples/exporter"
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"go.opencensus.io/plugin/ochttp"
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"go.opencensus.io/stats/view"
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"go.opencensus.io/trace"
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)
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func main() {
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go func() { log.Fatal(http.ListenAndServe(":8081", zpages.Handler)) }()
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// Register stats and trace exporters to export the collected data.
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exporter := &exporter.PrintExporter{}
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view.RegisterExporter(exporter)
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trace.RegisterExporter(exporter)
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// Always trace for this demo.
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trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
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// Report stats at every second.
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view.SetReportingPeriod(1 * time.Second)
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client := &http.Client{Transport: &ochttp.Transport{}}
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http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
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fmt.Fprintf(w, "hello world")
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r, _ := http.NewRequest("GET", "https://example.com", nil)
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// Propagate the trace header info in the outgoing requests.
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r = r.WithContext(req.Context())
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resp, err := client.Do(r)
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if err != nil {
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log.Println(err)
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} else {
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// TODO: handle response
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resp.Body.Close()
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}
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})
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log.Fatal(http.ListenAndServe(":50030", &ochttp.Handler{}))
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}
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