Add riemann output

Closes #34

README.md

@@ -219,6 +219,7 @@ found by running `telegraf -sample-config`.
 * librato
 * prometheus
 * amon
+* riemann
 
 ## Contributing
 

outputs/all/all.go

@@ -11,4 +11,5 @@ import (
 	_ "github.com/influxdb/telegraf/outputs/nsq"
 	_ "github.com/influxdb/telegraf/outputs/opentsdb"
 	_ "github.com/influxdb/telegraf/outputs/prometheus_client"
+	_ "github.com/influxdb/telegraf/outputs/riemann"
 )

outputs/riemann/riemann.go

@@ -0,0 +1,96 @@
+package riemann
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/amir/raidman"
+	"github.com/influxdb/influxdb/client/v2"
+	"github.com/influxdb/telegraf/outputs"
+)
+
+type Riemann struct {
+	URL       string
+	Transport string
+
+	client raidman.Client
+}
+
+var sampleConfig = `
+  # URL of server
+  url = "localhost:5555"
+  # transport protocol to use either tcp or udp
+  transport = "tcp"
+`
+
+func (r *Riemann) Connect() error {
+	c, err := raidman.Dial(r.Transport, r.URL)
+
+	if err != nil {
+		return err
+	}
+
+	r.client = *c
+	return nil
+}
+
+func (r *Riemann) Close() error {
+	r.client.Close()
+	return nil
+}
+
+func (r *Riemann) SampleConfig() string {
+	return sampleConfig
+}
+
+func (r *Riemann) Description() string {
+	return "Configuration for the Riemann server to send metrics to"
+}
+
+func (r *Riemann) Write(points []*client.Point) error {
+	if len(points) == 0 {
+		return nil
+	}
+
+	var events []*raidman.Event
+	for _, p := range points {
+		ev := buildEvent(p)
+		events = append(events, &ev)
+	}
+
+	var senderr = r.client.SendMulti(events)
+	if senderr != nil {
+		return errors.New(fmt.Sprintf("FAILED to send riemann message: %s\n",
+			senderr))
+	}
+
+	return nil
+}
+
+func buildEvent(p *client.Point) raidman.Event {
+	host := p.Tags()["host"]
+
+	if len(host) == 0 {
+		hostname, err := os.Hostname()
+		if err != nil {
+			host = "unknown"
+		} else {
+			host = hostname
+		}
+	}
+
+	var event = &raidman.Event{
+		Host:    host,
+		Service: p.Name(),
+		Metric:  p.Fields()["value"],
+	}
+
+	return *event
+}
+
+func init() {
+	outputs.Add("riemann", func() outputs.Output {
+		return &Riemann{}
+	})
+}

outputs/riemann/riemann_test.go

@@ -0,0 +1,27 @@
+package riemann
+
+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")
+	}
+
+	url := testutil.GetLocalHost() + ":5555"
+
+	r := &Riemann{
+		URL:       url,
+		Transport: "tcp",
+	}
+
+	err := r.Connect()
+	require.NoError(t, err)
+
+	err = r.Write(testutil.MockBatchPoints().Points())
+	require.NoError(t, err)
+}