github.com/waldiirawan/apm-agent-go/v2@v2.2.2/testmain_test.go (about)

     1  // Licensed to Elasticsearch B.V. under one or more contributor
     2  // license agreements. See the NOTICE file distributed with
     3  // this work for additional information regarding copyright
     4  // ownership. Elasticsearch B.V. licenses this file to you under
     5  // the Apache License, Version 2.0 (the "License"); you may
     6  // not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing,
    12  // software distributed under the License is distributed on an
    13  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    14  // KIND, either express or implied.  See the License for the
    15  // specific language governing permissions and limitations
    16  // under the License.
    17  
    18  package apm_test
    19  
    20  import (
    21  	"bytes"
    22  	"encoding/json"
    23  	"flag"
    24  	"os"
    25  	"os/exec"
    26  	"testing"
    27  
    28  	"github.com/stretchr/testify/assert"
    29  	"github.com/stretchr/testify/require"
    30  
    31  	"github.com/waldiirawan/apm-agent-go/v2/apmtest"
    32  	"github.com/waldiirawan/apm-agent-go/v2/model"
    33  	"go.elastic.co/fastjson"
    34  )
    35  
    36  var (
    37  	flagDumpMetadata = flag.Bool("dump-metadata", false, "Dump metadata and exit without running any tests")
    38  )
    39  
    40  func TestMain(m *testing.M) {
    41  	// call flag.Parse() here if TestMain uses flags
    42  	flag.Parse()
    43  	if *flagDumpMetadata {
    44  		dumpMetadata()
    45  		os.Exit(0)
    46  	}
    47  	os.Exit(m.Run())
    48  }
    49  
    50  func getSubprocessMetadata(t *testing.T, env ...string) (*model.System, *model.Process, *model.Service, model.StringMap) {
    51  	cmd := exec.Command(os.Args[0], "-dump-metadata")
    52  	cmd.Env = append(os.Environ(), env...)
    53  
    54  	var stdout bytes.Buffer
    55  	cmd.Stdout = &stdout
    56  	cmd.Stderr = os.Stderr
    57  	if !assert.NoError(t, cmd.Run()) {
    58  		t.FailNow()
    59  	}
    60  
    61  	var system model.System
    62  	var process model.Process
    63  	var service model.Service
    64  	var labels model.StringMap
    65  
    66  	output := stdout.String()
    67  	d := json.NewDecoder(&stdout)
    68  	if !assert.NoError(t, d.Decode(&system)) {
    69  		t.Logf("output: %q", output)
    70  		t.FailNow()
    71  	}
    72  	require.NoError(t, d.Decode(&process))
    73  	require.NoError(t, d.Decode(&service))
    74  	require.NoError(t, d.Decode(&labels))
    75  	return &system, &process, &service, labels
    76  }
    77  
    78  func dumpMetadata() {
    79  	tracer := apmtest.NewRecordingTracer()
    80  	defer tracer.Close()
    81  
    82  	tracer.StartTransaction("name", "type").End()
    83  	tracer.Flush(nil)
    84  	system, process, service, labels := tracer.Metadata()
    85  
    86  	var w fastjson.Writer
    87  	for _, m := range []fastjson.Marshaler{&system, &process, &service, labels} {
    88  		if err := m.MarshalFastJSON(&w); err != nil {
    89  			panic(err)
    90  		}
    91  	}
    92  	os.Stdout.Write(w.Bytes())
    93  }