telegraf/plugins/inputs/mqtt_consumer/mqtt_consumer_test.go

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package mqtt_consumer
import (
"testing"
"github.com/influxdata/telegraf/plugins/parsers"
"github.com/influxdata/telegraf/testutil"
"github.com/stretchr/testify/assert"
"github.com/eclipse/paho.mqtt.golang"
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)
const (
testMsg = "cpu_load_short,host=server01 value=23422.0 1422568543702900257\n"
testMsgNeg = "cpu_load_short,host=server01 value=-23422.0 1422568543702900257\n"
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testMsgGraphite = "cpu.load.short.graphite 23422 1454780029"
testMsgJSON = "{\"a\": 5, \"b\": {\"c\": 6}}\n"
invalidMsg = "cpu_load_short,host=server01 1422568543702900257\n"
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)
func newTestMQTTConsumer() (*MQTTConsumer, chan mqtt.Message) {
in := make(chan mqtt.Message, 100)
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n := &MQTTConsumer{
Topics: []string{"telegraf"},
Servers: []string{"localhost:1883"},
in: in,
done: make(chan struct{}),
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}
return n, in
}
// Test that default client has random ID
func TestRandomClientID(t *testing.T) {
m1 := &MQTTConsumer{
Servers: []string{"localhost:1883"}}
opts, err := m1.createOpts()
assert.NoError(t, err)
m2 := &MQTTConsumer{
Servers: []string{"localhost:1883"}}
opts2, err2 := m2.createOpts()
assert.NoError(t, err2)
assert.NotEqual(t, opts.ClientID, opts2.ClientID)
}
// Test that default client has random ID
func TestClientID(t *testing.T) {
m1 := &MQTTConsumer{
Servers: []string{"localhost:1883"},
ClientID: "telegraf-test",
}
opts, err := m1.createOpts()
assert.NoError(t, err)
m2 := &MQTTConsumer{
Servers: []string{"localhost:1883"},
ClientID: "telegraf-test",
}
opts2, err2 := m2.createOpts()
assert.NoError(t, err2)
assert.Equal(t, "telegraf-test", opts2.ClientID)
assert.Equal(t, "telegraf-test", opts.ClientID)
}
// Test that Start() fails if client ID is not set but persistent is
func TestPersistentClientIDFail(t *testing.T) {
m1 := &MQTTConsumer{
Servers: []string{"localhost:1883"},
PersistentSession: true,
}
acc := testutil.Accumulator{}
err := m1.Start(&acc)
assert.Error(t, err)
}
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func TestRunParser(t *testing.T) {
n, in := newTestMQTTConsumer()
acc := testutil.Accumulator{}
n.acc = &acc
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defer close(n.done)
n.parser, _ = parsers.NewInfluxParser()
go n.receiver()
in <- mqttMsg(testMsgNeg)
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acc.Wait(1)
if a := acc.NFields(); a != 1 {
t.Errorf("got %v, expected %v", a, 1)
}
}
func TestRunParserNegativeNumber(t *testing.T) {
n, in := newTestMQTTConsumer()
acc := testutil.Accumulator{}
n.acc = &acc
defer close(n.done)
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n.parser, _ = parsers.NewInfluxParser()
go n.receiver()
in <- mqttMsg(testMsg)
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acc.Wait(1)
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if a := acc.NFields(); a != 1 {
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t.Errorf("got %v, expected %v", a, 1)
}
}
// Test that the parser ignores invalid messages
func TestRunParserInvalidMsg(t *testing.T) {
n, in := newTestMQTTConsumer()
acc := testutil.Accumulator{}
n.acc = &acc
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defer close(n.done)
n.parser, _ = parsers.NewInfluxParser()
go n.receiver()
in <- mqttMsg(invalidMsg)
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acc.WaitError(1)
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if a := acc.NFields(); a != 0 {
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t.Errorf("got %v, expected %v", a, 0)
}
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assert.Contains(t, acc.Errors[0].Error(), "MQTT Parse Error")
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}
// Test that the parser parses line format messages into metrics
func TestRunParserAndGather(t *testing.T) {
n, in := newTestMQTTConsumer()
acc := testutil.Accumulator{}
n.acc = &acc
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defer close(n.done)
n.parser, _ = parsers.NewInfluxParser()
go n.receiver()
in <- mqttMsg(testMsg)
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acc.Wait(1)
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n.Gather(&acc)
acc.AssertContainsFields(t, "cpu_load_short",
map[string]interface{}{"value": float64(23422)})
}
// Test that the parser parses graphite format messages into metrics
func TestRunParserAndGatherGraphite(t *testing.T) {
n, in := newTestMQTTConsumer()
acc := testutil.Accumulator{}
n.acc = &acc
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defer close(n.done)
n.parser, _ = parsers.NewGraphiteParser("_", []string{}, nil)
go n.receiver()
in <- mqttMsg(testMsgGraphite)
n.Gather(&acc)
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acc.Wait(1)
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acc.AssertContainsFields(t, "cpu_load_short_graphite",
map[string]interface{}{"value": float64(23422)})
}
// Test that the parser parses json format messages into metrics
func TestRunParserAndGatherJSON(t *testing.T) {
n, in := newTestMQTTConsumer()
acc := testutil.Accumulator{}
n.acc = &acc
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defer close(n.done)
n.parser, _ = parsers.NewJSONParser("nats_json_test", []string{}, nil)
go n.receiver()
in <- mqttMsg(testMsgJSON)
n.Gather(&acc)
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acc.Wait(1)
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acc.AssertContainsFields(t, "nats_json_test",
map[string]interface{}{
"a": float64(5),
"b_c": float64(6),
})
}
func mqttMsg(val string) mqtt.Message {
return &message{
topic: "telegraf/unit_test",
payload: []byte(val),
}
}
// Take the message struct from the paho mqtt client library for returning
// a test message interface.
type message struct {
duplicate bool
qos byte
retained bool
topic string
messageID uint16
payload []byte
}
func (m *message) Duplicate() bool {
return m.duplicate
}
func (m *message) Qos() byte {
return m.qos
}
func (m *message) Retained() bool {
return m.retained
}
func (m *message) Topic() string {
return m.topic
}
func (m *message) MessageID() uint16 {
return m.messageID
}
func (m *message) Payload() []byte {
return m.payload
}