telegraf/plugins/inputs/nats_consumer/nats_consumer_test.go

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package natsconsumer
import (
"testing"
"github.com/influxdata/telegraf/plugins/parsers"
"github.com/influxdata/telegraf/testutil"
nats "github.com/nats-io/go-nats"
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"github.com/stretchr/testify/assert"
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)
const (
testMsg = "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"
metricBuffer = 5
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)
func newTestNatsConsumer() (*natsConsumer, chan *nats.Msg) {
in := make(chan *nats.Msg, metricBuffer)
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n := &natsConsumer{
QueueGroup: "test",
Subjects: []string{"telegraf"},
Servers: []string{"nats://localhost:4222"},
Secure: false,
in: in,
errs: make(chan error, metricBuffer),
done: make(chan struct{}),
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}
return n, in
}
// Test that the parser parses NATS messages into metrics
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func TestRunParser(t *testing.T) {
n, in := newTestNatsConsumer()
acc := testutil.Accumulator{}
n.acc = &acc
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defer close(n.done)
n.parser, _ = parsers.NewInfluxParser()
n.wg.Add(1)
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go n.receiver()
in <- natsMsg(testMsg)
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acc.Wait(1)
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}
// Test that the parser ignores invalid messages
func TestRunParserInvalidMsg(t *testing.T) {
n, in := newTestNatsConsumer()
acc := testutil.Accumulator{}
n.acc = &acc
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defer close(n.done)
n.parser, _ = parsers.NewInfluxParser()
n.wg.Add(1)
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go n.receiver()
in <- natsMsg(invalidMsg)
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acc.WaitError(1)
assert.Contains(t, acc.Errors[0].Error(), "E! subject: telegraf, error: metric parse error")
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assert.EqualValues(t, 0, acc.NMetrics())
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}
// Test that the parser parses line format messages into metrics
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func TestRunParserAndGather(t *testing.T) {
n, in := newTestNatsConsumer()
acc := testutil.Accumulator{}
n.acc = &acc
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defer close(n.done)
n.parser, _ = parsers.NewInfluxParser()
n.wg.Add(1)
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go n.receiver()
in <- natsMsg(testMsg)
n.Gather(&acc)
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acc.Wait(1)
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acc.AssertContainsFields(t, "cpu_load_short",
map[string]interface{}{"value": float64(23422)})
}
// Test that the parser parses graphite format messages into metrics
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func TestRunParserAndGatherGraphite(t *testing.T) {
n, in := newTestNatsConsumer()
acc := testutil.Accumulator{}
n.acc = &acc
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defer close(n.done)
n.parser, _ = parsers.NewGraphiteParser("_", []string{}, nil)
n.wg.Add(1)
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go n.receiver()
in <- natsMsg(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
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func TestRunParserAndGatherJSON(t *testing.T) {
n, in := newTestNatsConsumer()
acc := testutil.Accumulator{}
n.acc = &acc
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defer close(n.done)
n.parser, _ = parsers.NewJSONParser("nats_json_test", []string{}, nil)
n.wg.Add(1)
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go n.receiver()
in <- natsMsg(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 natsMsg(val string) *nats.Msg {
return &nats.Msg{
Subject: "telegraf",
Data: []byte(val),
}
}