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env_test.go
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env_test.go
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package metrics
import (
"encoding/json"
"log"
"os"
"testing"
"time"
"github.com/nats-io/gnatsd/server"
"github.com/nats-io/nats"
"github.com/nats-io/nats/test"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
var nc *nats.Conn
var s *server.Server
const metricsSubject = "test.metrics"
func TestMain(m *testing.M) {
s = test.RunDefaultServer()
defer s.Shutdown()
var err error
nc, err = nats.Connect("nats://" + s.Addr().String())
if err != nil {
log.Fatal("failed to connect to server: " + err.Error())
}
defer nc.Close()
os.Exit(m.Run())
}
func TestSendMetric(t *testing.T) {
// start listening for the metric
sub, env := subscribe(t)
defer sub.Unsubscribe()
// create the metric
sender := env.newMetric("something", CounterType, nil)
sender.Value = 123
err := sender.send(nil)
assert.Nil(t, err)
m := readOne(t, sub)
if assert.NotNil(t, m) {
assert.Equal(t, "something", m.Name)
assert.EqualValues(t, m.Value, 123)
assert.Equal(t, m.Type, CounterType)
assert.NotNil(t, m.Dims)
assert.Len(t, m.Dims, 0)
}
// validate counts
checkCounters(t, 1, 0, 0, env)
}
func TestSendMetricWithNilConn(t *testing.T) {
env, err := NewEnvironment(nil, metricsSubject)
if assert.NoError(t, err) {
sender := env.newMetric("something", CounterType, nil)
sender.Value = 123
err := sender.send(nil)
assert.Nil(t, err)
}
}
func TestSendWithTracer(t *testing.T) {
sub, env := subscribe(t)
defer sub.Unsubscribe()
called := false
env.tracer = func(m *RawMetric) {
if assert.NotNil(t, m) {
assert.Equal(t, "something", m.Name)
assert.EqualValues(t, m.Value, 123)
assert.Equal(t, m.Type, CounterType)
assert.NotNil(t, m.Dims)
assert.Len(t, m.Dims, 0)
}
called = true
}
// create the metric
sender := env.newMetric("something", CounterType, nil)
sender.Value = 123
err := sender.send(nil)
assert.Nil(t, err)
m := readOne(t, sub)
if assert.NotNil(t, m) {
assert.Equal(t, "something", m.Name)
assert.EqualValues(t, m.Value, 123)
assert.Equal(t, m.Type, CounterType)
assert.NotNil(t, m.Dims)
assert.Len(t, m.Dims, 0)
}
assert.True(t, called)
// validate counts
checkCounters(t, 1, 0, 0, env)
}
func TestSeparateEnv(t *testing.T) {
f1, err := NewEnvironment(nc, "first-env")
require.NoError(t, err)
f2, err := NewEnvironment(nc, "second-env")
require.NoError(t, err)
sub1, err := nc.SubscribeSync("first-env")
require.NoError(t, err)
sub2, err := nc.SubscribeSync("second-env")
require.NoError(t, err)
require.NoError(t, f1.NewCounter("c1", nil).Count(nil))
require.NoError(t, f2.NewCounter("c2", nil).Count(nil))
raw1, err := sub1.NextMsg(time.Second)
require.NoError(t, err)
raw2, err := sub2.NextMsg(time.Second)
require.NoError(t, err)
m1 := new(RawMetric)
m2 := new(RawMetric)
require.NoError(t, json.Unmarshal(raw1.Data, m1))
require.NoError(t, json.Unmarshal(raw2.Data, m2))
assert.Equal(t, "c1", m1.Name)
assert.Equal(t, "c2", m2.Name)
}
func subscribe(t *testing.T) (*nats.Subscription, *Environment) {
sub, err := nc.SubscribeSync(metricsSubject)
if err != nil {
assert.FailNow(t, "Failed to subscribe: "+err.Error())
}
env, err := NewEnvironment(nc, metricsSubject)
if err != nil {
assert.FailNow(t, "Failed to create test env")
}
return sub, env
}
func checkCounters(t *testing.T, counters, timers, gauges int, env *Environment) {
assert.EqualValues(t, counters, env.countersSent)
assert.EqualValues(t, timers, env.timersSent)
assert.EqualValues(t, gauges, env.gaugesSent)
}
func readOne(t *testing.T, sub *nats.Subscription) *metric {
msg, err := sub.NextMsg(time.Second)
if err != nil {
assert.Fail(t, "Failed waiting for a message: "+err.Error())
return nil
}
m := new(metric)
err = json.Unmarshal(msg.Data, m)
assert.Nil(t, err)
return m
}