telegraf/plugins/inputs/mqtt_consumer/mqtt_consumer_test.go

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package mqtt_consumer
import (
"testing"
"time"
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"github.com/eclipse/paho.mqtt.golang"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/parsers"
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"github.com/influxdata/telegraf/testutil"
"github.com/stretchr/testify/require"
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)
type FakeClient struct {
ConnectF func() mqtt.Token
SubscribeMultipleF func(filters map[string]byte, callback mqtt.MessageHandler) mqtt.Token
AddRouteF func(topic string, callback mqtt.MessageHandler)
DisconnectF func(quiesce uint)
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connectCallCount int
subscribeCallCount int
addRouteCallCount int
disconnectCallCount int
}
func (c *FakeClient) Connect() mqtt.Token {
c.connectCallCount++
return c.ConnectF()
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}
func (c *FakeClient) SubscribeMultiple(filters map[string]byte, callback mqtt.MessageHandler) mqtt.Token {
c.subscribeCallCount++
return c.SubscribeMultipleF(filters, callback)
}
func (c *FakeClient) AddRoute(topic string, callback mqtt.MessageHandler) {
c.addRouteCallCount++
c.AddRouteF(topic, callback)
}
func (c *FakeClient) Disconnect(quiesce uint) {
c.disconnectCallCount++
c.DisconnectF(quiesce)
}
type FakeParser struct {
}
// FakeParser satisfies parsers.Parser
var _ parsers.Parser = &FakeParser{}
func (p *FakeParser) Parse(buf []byte) ([]telegraf.Metric, error) {
panic("not implemented")
}
func (p *FakeParser) ParseLine(line string) (telegraf.Metric, error) {
panic("not implemented")
}
func (p *FakeParser) SetDefaultTags(tags map[string]string) {
panic("not implemented")
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}
type FakeToken struct {
sessionPresent bool
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}
// FakeToken satisfies mqtt.Token
var _ mqtt.Token = &FakeToken{}
func (t *FakeToken) Wait() bool {
return true
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}
func (t *FakeToken) WaitTimeout(time.Duration) bool {
return true
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}
func (t *FakeToken) Error() error {
return nil
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}
func (t *FakeToken) SessionPresent() bool {
return t.sessionPresent
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}
// Test the basic lifecycle transitions of the plugin.
func TestLifecycleSanity(t *testing.T) {
var acc testutil.Accumulator
plugin := New(func(o *mqtt.ClientOptions) Client {
return &FakeClient{
ConnectF: func() mqtt.Token {
return &FakeToken{}
},
AddRouteF: func(topic string, callback mqtt.MessageHandler) {
},
SubscribeMultipleF: func(filters map[string]byte, callback mqtt.MessageHandler) mqtt.Token {
return &FakeToken{}
},
DisconnectF: func(quiesce uint) {
},
}
})
plugin.Servers = []string{"tcp://127.0.0.1"}
parser := &FakeParser{}
plugin.SetParser(parser)
err := plugin.Init()
require.NoError(t, err)
err = plugin.Start(&acc)
require.NoError(t, err)
err = plugin.Gather(&acc)
require.NoError(t, err)
plugin.Stop()
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}
// Test that default client has random ID
func TestRandomClientID(t *testing.T) {
var err error
m1 := New(nil)
err = m1.Init()
require.NoError(t, err)
m2 := New(nil)
err = m2.Init()
require.NoError(t, err)
require.NotEqual(t, m1.opts.ClientID, m2.opts.ClientID)
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}
// PersistentSession requires ClientID
func TestPersistentClientIDFail(t *testing.T) {
plugin := New(nil)
plugin.PersistentSession = true
err := plugin.Init()
require.Error(t, err)
}
type Message struct {
}
func (m *Message) Duplicate() bool {
panic("not implemented")
}
func (m *Message) Qos() byte {
panic("not implemented")
}
func (m *Message) Retained() bool {
panic("not implemented")
}
func (m *Message) Topic() string {
return "telegraf"
}
func (m *Message) MessageID() uint16 {
panic("not implemented")
}
func (m *Message) Payload() []byte {
return []byte("cpu time_idle=42i")
}
func (m *Message) Ack() {
panic("not implemented")
}
func TestTopicTag(t *testing.T) {
tests := []struct {
name string
topicTag func() *string
expected []telegraf.Metric
}{
{
name: "default topic when topic tag is unset for backwards compatibility",
topicTag: func() *string {
return nil
},
expected: []telegraf.Metric{
testutil.MustMetric(
"cpu",
map[string]string{
"topic": "telegraf",
},
map[string]interface{}{
"time_idle": 42,
},
time.Unix(0, 0),
),
},
},
{
name: "use topic tag when set",
topicTag: func() *string {
tag := "topic_tag"
return &tag
},
expected: []telegraf.Metric{
testutil.MustMetric(
"cpu",
map[string]string{
"topic_tag": "telegraf",
},
map[string]interface{}{
"time_idle": 42,
},
time.Unix(0, 0),
),
},
},
{
name: "no topic tag is added when topic tag is set to the empty string",
topicTag: func() *string {
tag := ""
return &tag
},
expected: []telegraf.Metric{
testutil.MustMetric(
"cpu",
map[string]string{},
map[string]interface{}{
"time_idle": 42,
},
time.Unix(0, 0),
),
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
var handler mqtt.MessageHandler
client := &FakeClient{
ConnectF: func() mqtt.Token {
return &FakeToken{}
},
AddRouteF: func(topic string, callback mqtt.MessageHandler) {
handler = callback
},
SubscribeMultipleF: func(filters map[string]byte, callback mqtt.MessageHandler) mqtt.Token {
return &FakeToken{}
},
DisconnectF: func(quiesce uint) {
},
}
plugin := New(func(o *mqtt.ClientOptions) Client {
return client
})
plugin.Topics = []string{"telegraf"}
plugin.TopicTag = tt.topicTag()
parser, err := parsers.NewInfluxParser()
require.NoError(t, err)
plugin.SetParser(parser)
err = plugin.Init()
require.NoError(t, err)
var acc testutil.Accumulator
err = plugin.Start(&acc)
require.NoError(t, err)
handler(nil, &Message{})
plugin.Stop()
testutil.RequireMetricsEqual(t, tt.expected, acc.GetTelegrafMetrics(),
testutil.IgnoreTime())
})
}
}
func TestAddRouteCalledForEachTopic(t *testing.T) {
client := &FakeClient{
ConnectF: func() mqtt.Token {
return &FakeToken{}
},
AddRouteF: func(topic string, callback mqtt.MessageHandler) {
},
SubscribeMultipleF: func(filters map[string]byte, callback mqtt.MessageHandler) mqtt.Token {
return &FakeToken{}
},
DisconnectF: func(quiesce uint) {
},
}
plugin := New(func(o *mqtt.ClientOptions) Client {
return client
})
plugin.Topics = []string{"a", "b"}
err := plugin.Init()
require.NoError(t, err)
var acc testutil.Accumulator
err = plugin.Start(&acc)
require.NoError(t, err)
plugin.Stop()
require.Equal(t, client.addRouteCallCount, 2)
}
func TestSubscribeCalledIfNoSession(t *testing.T) {
client := &FakeClient{
ConnectF: func() mqtt.Token {
return &FakeToken{}
},
AddRouteF: func(topic string, callback mqtt.MessageHandler) {
},
SubscribeMultipleF: func(filters map[string]byte, callback mqtt.MessageHandler) mqtt.Token {
return &FakeToken{}
},
DisconnectF: func(quiesce uint) {
},
}
plugin := New(func(o *mqtt.ClientOptions) Client {
return client
})
plugin.Topics = []string{"b"}
err := plugin.Init()
require.NoError(t, err)
var acc testutil.Accumulator
err = plugin.Start(&acc)
require.NoError(t, err)
plugin.Stop()
require.Equal(t, client.subscribeCallCount, 1)
}
func TestSubscribeNotCalledIfSession(t *testing.T) {
client := &FakeClient{
ConnectF: func() mqtt.Token {
return &FakeToken{sessionPresent: true}
},
AddRouteF: func(topic string, callback mqtt.MessageHandler) {
},
SubscribeMultipleF: func(filters map[string]byte, callback mqtt.MessageHandler) mqtt.Token {
return &FakeToken{}
},
DisconnectF: func(quiesce uint) {
},
}
plugin := New(func(o *mqtt.ClientOptions) Client {
return client
})
plugin.Topics = []string{"b"}
err := plugin.Init()
require.NoError(t, err)
var acc testutil.Accumulator
err = plugin.Start(&acc)
require.NoError(t, err)
plugin.Stop()
require.Equal(t, client.subscribeCallCount, 0)
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}