github.com/newrelic/go-agent@v3.26.0+incompatible/examples/client/main.go (about)

     1  // Copyright 2020 New Relic Corporation. All rights reserved.
     2  // SPDX-License-Identifier: Apache-2.0
     3  
     4  package main
     5  
     6  import (
     7  	"fmt"
     8  	"net/http"
     9  	"os"
    10  	"time"
    11  
    12  	"github.com/newrelic/go-agent"
    13  )
    14  
    15  func mustGetEnv(key string) string {
    16  	if val := os.Getenv(key); "" != val {
    17  		return val
    18  	}
    19  	panic(fmt.Sprintf("environment variable %s unset", key))
    20  }
    21  
    22  func doRequest(txn newrelic.Transaction) error {
    23  	req, err := http.NewRequest("GET", "http://localhost:8000/segments", nil)
    24  	if nil != err {
    25  		return err
    26  	}
    27  	client := &http.Client{}
    28  	seg := newrelic.StartExternalSegment(txn, req)
    29  	defer seg.End()
    30  	resp, err := client.Do(req)
    31  	if nil != err {
    32  		return err
    33  	}
    34  	fmt.Println("response code is", resp.StatusCode)
    35  	return nil
    36  }
    37  
    38  func main() {
    39  	cfg := newrelic.NewConfig("Client App", mustGetEnv("NEW_RELIC_LICENSE_KEY"))
    40  	cfg.Logger = newrelic.NewDebugLogger(os.Stdout)
    41  	app, err := newrelic.NewApplication(cfg)
    42  	if nil != err {
    43  		fmt.Println(err)
    44  		os.Exit(1)
    45  	}
    46  
    47  	// Wait for the application to connect.
    48  	if err = app.WaitForConnection(5 * time.Second); nil != err {
    49  		fmt.Println(err)
    50  	}
    51  
    52  	txn := app.StartTransaction("client-txn", nil, nil)
    53  	err = doRequest(txn)
    54  	if nil != err {
    55  		txn.NoticeError(err)
    56  	}
    57  	txn.End()
    58  
    59  	// Shut down the application to flush data to New Relic.
    60  	app.Shutdown(10 * time.Second)
    61  }