renaming plugins -> inputs

plugins/outputs/mqtt/mqtt.go

@@ -0,0 +1,190 @@
+package mqtt
+
+import (
+	"crypto/rand"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"io/ioutil"
+	"strings"
+	"sync"
+
+	paho "git.eclipse.org/gitroot/paho/org.eclipse.paho.mqtt.golang.git"
+	"github.com/influxdb/influxdb/client/v2"
+	"github.com/influxdb/telegraf/internal"
+	"github.com/influxdb/telegraf/plugins/outputs"
+)
+
+const MaxClientIdLen = 8
+const MaxRetryCount = 3
+const ClientIdPrefix = "telegraf"
+
+type MQTT struct {
+	Servers     []string `toml:"servers"`
+	Username    string
+	Password    string
+	Database    string
+	Timeout     internal.Duration
+	TopicPrefix string
+
+	Client *paho.Client
+	Opts   *paho.ClientOptions
+	sync.Mutex
+}
+
+var sampleConfig = `
+  servers = ["localhost:1883"] # required.
+
+  # MQTT outputs send metrics to this topic format
+  #    "<topic_prefix>/host/<hostname>/<pluginname>/"
+  #   ex: prefix/host/web01.example.com/mem/available
+  # topic_prefix = "prefix"
+
+  # username and password to connect MQTT server.
+  # username = "telegraf"
+  # password = "metricsmetricsmetricsmetrics"
+`
+
+func (m *MQTT) Connect() error {
+	var err error
+	m.Lock()
+	defer m.Unlock()
+
+	m.Opts, err = m.CreateOpts()
+	if err != nil {
+		return err
+	}
+
+	m.Client = paho.NewClient(m.Opts)
+	if token := m.Client.Connect(); token.Wait() && token.Error() != nil {
+		return token.Error()
+	}
+
+	return nil
+}
+
+func (m *MQTT) Close() error {
+	if m.Client.IsConnected() {
+		m.Client.Disconnect(20)
+	}
+	return nil
+}
+
+func (m *MQTT) SampleConfig() string {
+	return sampleConfig
+}
+
+func (m *MQTT) Description() string {
+	return "Configuration for MQTT server to send metrics to"
+}
+
+func (m *MQTT) Write(points []*client.Point) error {
+	m.Lock()
+	defer m.Unlock()
+	if len(points) == 0 {
+		return nil
+	}
+	hostname, ok := points[0].Tags()["host"]
+	if !ok {
+		hostname = ""
+	}
+
+	for _, p := range points {
+		var t []string
+		if m.TopicPrefix != "" {
+			t = append(t, m.TopicPrefix)
+		}
+		tm := strings.Split(p.Name(), "_")
+		if len(tm) < 2 {
+			tm = []string{p.Name(), "stat"}
+		}
+
+		t = append(t, "host", hostname, tm[0], tm[1])
+		topic := strings.Join(t, "/")
+
+		value := p.String()
+		err := m.publish(topic, value)
+		if err != nil {
+			return fmt.Errorf("Could not write to MQTT server, %s", err)
+		}
+	}
+
+	return nil
+}
+
+func (m *MQTT) publish(topic, body string) error {
+	token := m.Client.Publish(topic, 0, false, body)
+	token.Wait()
+	if token.Error() != nil {
+		return token.Error()
+	}
+	return nil
+}
+
+func (m *MQTT) CreateOpts() (*paho.ClientOptions, error) {
+	opts := paho.NewClientOptions()
+
+	clientId := getRandomClientId()
+	opts.SetClientID(clientId)
+
+	TLSConfig := &tls.Config{InsecureSkipVerify: false}
+	ca := "" // TODO
+	scheme := "tcp"
+	if ca != "" {
+		scheme = "ssl"
+		certPool, err := getCertPool(ca)
+		if err != nil {
+			return nil, err
+		}
+		TLSConfig.RootCAs = certPool
+	}
+	TLSConfig.InsecureSkipVerify = true // TODO
+	opts.SetTLSConfig(TLSConfig)
+
+	user := m.Username
+	if user == "" {
+		opts.SetUsername(user)
+	}
+	password := m.Password
+	if password != "" {
+		opts.SetPassword(password)
+	}
+
+	if len(m.Servers) == 0 {
+		return opts, fmt.Errorf("could not get host infomations")
+	}
+	for _, host := range m.Servers {
+		server := fmt.Sprintf("%s://%s", scheme, host)
+
+		opts.AddBroker(server)
+	}
+	opts.SetAutoReconnect(true)
+	return opts, nil
+}
+
+func getRandomClientId() string {
+	const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	var bytes = make([]byte, MaxClientIdLen)
+	rand.Read(bytes)
+	for i, b := range bytes {
+		bytes[i] = alphanum[b%byte(len(alphanum))]
+	}
+	return ClientIdPrefix + "-" + string(bytes)
+}
+
+func getCertPool(pemPath string) (*x509.CertPool, error) {
+	certs := x509.NewCertPool()
+
+	pemData, err := ioutil.ReadFile(pemPath)
+	if err != nil {
+		return nil, err
+	}
+	certs.AppendCertsFromPEM(pemData)
+	return certs, nil
+}
+
+func init() {
+	outputs.Add("mqtt", func() outputs.Output {
+		return &MQTT{}
+	})
+}

plugins/outputs/mqtt/mqtt_test.go

@@ -0,0 +1,27 @@
+package mqtt
+
+import (
+	"testing"
+
+	"github.com/influxdb/telegraf/testutil"
+	"github.com/stretchr/testify/require"
+)
+
+func TestConnectAndWrite(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping integration test in short mode")
+	}
+
+	var url = testutil.GetLocalHost() + ":1883"
+	m := &MQTT{
+		Servers: []string{url},
+	}
+
+	// Verify that we can connect to the MQTT broker
+	err := m.Connect()
+	require.NoError(t, err)
+
+	// Verify that we can successfully write data to the mqtt broker
+	err = m.Write(testutil.MockBatchPoints().Points())
+	require.NoError(t, err)
+}