telegraf/plugins/inputs/mqtt_consumer/mqtt_consumer_test.go

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2016-02-09 22:03:46 +00:00
package mqtt_consumer
import (
"testing"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/parsers"
"github.com/influxdata/telegraf/testutil"
"git.eclipse.org/gitroot/paho/org.eclipse.paho.mqtt.golang.git"
)
const (
testMsg = "cpu_load_short,host=server01 value=23422.0 1422568543702900257"
testMsgGraphite = "cpu.load.short.graphite 23422 1454780029"
testMsgJSON = "{\"a\": 5, \"b\": {\"c\": 6}}\n"
invalidMsg = "cpu_load_short,host=server01 1422568543702900257"
metricBuffer = 5
)
func newTestMQTTConsumer() (*MQTTConsumer, chan mqtt.Message) {
in := make(chan mqtt.Message, metricBuffer)
n := &MQTTConsumer{
Topics: []string{"telegraf"},
Servers: []string{"localhost:1883"},
MetricBuffer: metricBuffer,
in: in,
done: make(chan struct{}),
metricC: make(chan telegraf.Metric, metricBuffer),
topicC: make(chan string, metricBuffer),
}
return n, in
}
// Test that the parser parses NATS messages into metrics
func TestRunParser(t *testing.T) {
n, in := newTestMQTTConsumer()
defer close(n.done)
n.parser, _ = parsers.NewInfluxParser()
go n.receiver()
in <- mqttMsg(testMsg)
time.Sleep(time.Millisecond)
if a := len(n.metricC); a != 1 {
t.Errorf("got %v, expected %v", a, 1)
}
}
// Test that the parser ignores invalid messages
func TestRunParserInvalidMsg(t *testing.T) {
n, in := newTestMQTTConsumer()
defer close(n.done)
n.parser, _ = parsers.NewInfluxParser()
go n.receiver()
in <- mqttMsg(invalidMsg)
time.Sleep(time.Millisecond)
if a := len(n.metricC); a != 0 {
t.Errorf("got %v, expected %v", a, 0)
}
}
// Test that metrics are dropped when we hit the buffer limit
func TestRunParserRespectsBuffer(t *testing.T) {
n, in := newTestMQTTConsumer()
defer close(n.done)
n.parser, _ = parsers.NewInfluxParser()
go n.receiver()
for i := 0; i < metricBuffer+1; i++ {
in <- mqttMsg(testMsg)
}
time.Sleep(time.Millisecond)
if a := len(n.metricC); a != metricBuffer {
t.Errorf("got %v, expected %v", a, metricBuffer)
}
}
// Test that the parser parses line format messages into metrics
func TestRunParserAndGather(t *testing.T) {
n, in := newTestMQTTConsumer()
defer close(n.done)
n.parser, _ = parsers.NewInfluxParser()
go n.receiver()
in <- mqttMsg(testMsg)
time.Sleep(time.Millisecond)
acc := testutil.Accumulator{}
n.Gather(&acc)
if a := len(acc.Metrics); a != 1 {
t.Errorf("got %v, expected %v", a, 1)
}
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()
defer close(n.done)
n.parser, _ = parsers.NewGraphiteParser("_", []string{}, nil)
go n.receiver()
in <- mqttMsg(testMsgGraphite)
time.Sleep(time.Millisecond)
acc := testutil.Accumulator{}
n.Gather(&acc)
if a := len(acc.Metrics); a != 1 {
t.Errorf("got %v, expected %v", a, 1)
}
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()
defer close(n.done)
n.parser, _ = parsers.NewJSONParser("nats_json_test", []string{}, nil)
go n.receiver()
in <- mqttMsg(testMsgJSON)
time.Sleep(time.Millisecond)
acc := testutil.Accumulator{}
n.Gather(&acc)
if a := len(acc.Metrics); a != 1 {
t.Errorf("got %v, expected %v", a, 1)
}
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
}