1 // Copyright 2018, OpenCensus Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package main 16 17 import ( 18 "log" 19 "net/http" 20 "time" 21 22 "go.opencensus.io/plugin/ochttp" 23 "go.opencensus.io/trace" 24 25 "go.opencensus.io/examples/exporter" 26 "go.opencensus.io/stats/view" 27 ) 28 29 const server = "http://localhost:50030" 30 31 func main() { 32 // Register stats and trace exporters to export the collected data. 33 exporter := &exporter.PrintExporter{} 34 view.RegisterExporter(exporter) 35 trace.RegisterExporter(exporter) 36 37 // Always trace for this demo. In a production application, you should 38 // configure this to a trace.ProbabilitySampler set at the desired 39 // probability. 40 trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()}) 41 42 // Report stats at every second. 43 view.SetReportingPeriod(1 * time.Second) 44 45 client := &http.Client{Transport: &ochttp.Transport{}} 46 47 resp, err := client.Get(server) 48 if err != nil { 49 log.Printf("Failed to get response: %v", err) 50 } else { 51 resp.Body.Close() 52 } 53 54 time.Sleep(2 * time.Second) // Wait until stats are reported. 55 } 56