package nsq_consumer import ( "bufio" "bytes" "encoding/binary" "io" "log" "net" "strconv" "testing" "time" "github.com/influxdata/telegraf/plugins/parsers" "github.com/influxdata/telegraf/testutil" "github.com/nsqio/go-nsq" "github.com/stretchr/testify/assert" ) // This test is modeled after the kafka consumer integration test func TestReadsMetricsFromNSQ(t *testing.T) { msgID := nsq.MessageID{'1', '2', '3', '4', '5', '6', '7', '8', '9', '0', 'a', 's', 'd', 'f', 'g', 'h'} msg := nsq.NewMessage(msgID, []byte("cpu_load_short,direction=in,host=server01,region=us-west value=23422.0 1422568543702900257\n")) script := []instruction{ // SUB {0, nsq.FrameTypeResponse, []byte("OK")}, // IDENTIFY {0, nsq.FrameTypeResponse, []byte("OK")}, {20 * time.Millisecond, nsq.FrameTypeMessage, frameMessage(msg)}, // needed to exit test {100 * time.Millisecond, -1, []byte("exit")}, } addr, _ := net.ResolveTCPAddr("tcp", "127.0.0.1:4155") newMockNSQD(script, addr.String()) consumer := &NSQConsumer{ Server: "127.0.0.1:4155", Topic: "telegraf", Channel: "consume", MaxInFlight: 1, Nsqd: []string{"127.0.0.1:4155"}, } p, _ := parsers.NewInfluxParser() consumer.SetParser(p) var acc testutil.Accumulator assert.Equal(t, 0, len(acc.Metrics), "There should not be any points") if err := consumer.Start(&acc); err != nil { t.Fatal(err.Error()) } else { defer consumer.Stop() } waitForPoint(&acc, t) if len(acc.Metrics) == 1 { point := acc.Metrics[0] assert.Equal(t, "cpu_load_short", point.Measurement) assert.Equal(t, map[string]interface{}{"value": 23422.0}, point.Fields) assert.Equal(t, map[string]string{ "host": "server01", "direction": "in", "region": "us-west", }, point.Tags) assert.Equal(t, time.Unix(0, 1422568543702900257).Unix(), point.Time.Unix()) } else { t.Errorf("No points found in accumulator, expected 1") } } // Waits for the metric that was sent to the kafka broker to arrive at the kafka // consumer func waitForPoint(acc *testutil.Accumulator, t *testing.T) { // Give the kafka container up to 2 seconds to get the point to the consumer ticker := time.NewTicker(5 * time.Millisecond) defer ticker.Stop() counter := 0 for { select { case <-ticker.C: counter++ if counter > 1000 { t.Fatal("Waited for 5s, point never arrived to consumer") } else if acc.NFields() == 1 { return } } } } func newMockNSQD(script []instruction, addr string) *mockNSQD { n := &mockNSQD{ script: script, exitChan: make(chan int), } tcpListener, err := net.Listen("tcp", addr) if err != nil { log.Fatalf("FATAL: listen (%s) failed - %s", n.tcpAddr.String(), err) } n.tcpListener = tcpListener n.tcpAddr = tcpListener.Addr().(*net.TCPAddr) go n.listen() return n } // The code below allows us to mock the interactions with nsqd. This is taken from: // https://github.com/nsqio/go-nsq/blob/master/mock_test.go type instruction struct { delay time.Duration frameType int32 body []byte } type mockNSQD struct { script []instruction got [][]byte tcpAddr *net.TCPAddr tcpListener net.Listener exitChan chan int } func (n *mockNSQD) listen() { for { conn, err := n.tcpListener.Accept() if err != nil { break } go n.handle(conn) } close(n.exitChan) } func (n *mockNSQD) handle(conn net.Conn) { var idx int buf := make([]byte, 4) _, err := io.ReadFull(conn, buf) if err != nil { log.Fatalf("ERROR: failed to read protocol version - %s", err) } readChan := make(chan []byte) readDoneChan := make(chan int) scriptTime := time.After(n.script[0].delay) rdr := bufio.NewReader(conn) go func() { for { line, err := rdr.ReadBytes('\n') if err != nil { return } // trim the '\n' line = line[:len(line)-1] readChan <- line <-readDoneChan } }() var rdyCount int for idx < len(n.script) { select { case line := <-readChan: n.got = append(n.got, line) params := bytes.Split(line, []byte(" ")) switch { case bytes.Equal(params[0], []byte("IDENTIFY")): l := make([]byte, 4) _, err := io.ReadFull(rdr, l) if err != nil { log.Printf(err.Error()) goto exit } size := int32(binary.BigEndian.Uint32(l)) b := make([]byte, size) _, err = io.ReadFull(rdr, b) if err != nil { log.Printf(err.Error()) goto exit } case bytes.Equal(params[0], []byte("RDY")): rdy, _ := strconv.Atoi(string(params[1])) rdyCount = rdy case bytes.Equal(params[0], []byte("FIN")): case bytes.Equal(params[0], []byte("REQ")): } readDoneChan <- 1 case <-scriptTime: inst := n.script[idx] if bytes.Equal(inst.body, []byte("exit")) { goto exit } if inst.frameType == nsq.FrameTypeMessage { if rdyCount == 0 { scriptTime = time.After(n.script[idx+1].delay) continue } rdyCount-- } _, err := conn.Write(framedResponse(inst.frameType, inst.body)) if err != nil { log.Printf(err.Error()) goto exit } scriptTime = time.After(n.script[idx+1].delay) idx++ } } exit: n.tcpListener.Close() conn.Close() } func framedResponse(frameType int32, data []byte) []byte { var w bytes.Buffer beBuf := make([]byte, 4) size := uint32(len(data)) + 4 binary.BigEndian.PutUint32(beBuf, size) _, err := w.Write(beBuf) if err != nil { return nil } binary.BigEndian.PutUint32(beBuf, uint32(frameType)) _, err = w.Write(beBuf) if err != nil { return nil } w.Write(data) return w.Bytes() } func frameMessage(m *nsq.Message) []byte { var b bytes.Buffer m.WriteTo(&b) return b.Bytes() }