Add Graphite output

plugins/outputs/graphite/graphite.go

@@ -0,0 +1,134 @@
+package graphite
+
+import (
+	"errors"
+	"fmt"
+	"github.com/influxdb/influxdb/client/v2"
+	"github.com/influxdb/telegraf/plugins/outputs"
+	"log"
+	"math/rand"
+	"net"
+	"strings"
+	"time"
+)
+
+type Graphite struct {
+	// URL is only for backwards compatability
+	Servers []string
+	Prefix  string
+	Timeout int
+	conns   []net.Conn
+}
+
+var sampleConfig = `
+  # TCP raw endpoint for your graphite instance.
+  servers = ["mygraphiteserver:2003"] # default "localhost:2003"
+  # Prefix metrics name
+  prefix = "" # default ""
+  # Connection timeout in second (for the connection with Carbon(Graphite))
+  timeout = 2 # default 2s
+`
+
+func (g *Graphite) Connect() error {
+	// Set default values
+	if g.Timeout <= 0 {
+		g.Timeout = 2
+	}
+	if len(g.Servers) == 0 {
+		g.Servers = append(g.Servers, "localhost:2003")
+	}
+	// Get Connections
+	var conns []net.Conn
+	for _, server := range g.Servers {
+		conn, err := net.DialTimeout("tcp", server, time.Duration(g.Timeout)*time.Second)
+		if err == nil {
+			conns = append(conns, conn)
+		}
+	}
+	g.conns = conns
+	return nil
+}
+
+func (g *Graphite) Close() error {
+	// Closing all connections
+	for _, conn := range g.conns {
+		conn.Close()
+	}
+	return nil
+}
+
+func (g *Graphite) SampleConfig() string {
+	return sampleConfig
+}
+
+func (g *Graphite) Description() string {
+	return "Configuration for Graphite server to send metrics to using TCP raw protocol"
+}
+
+// Choose a random server in the cluster to write to until a successful write
+// occurs, logging each unsuccessful. If all servers fail, return error.
+func (g *Graphite) Write(points []*client.Point) error {
+	// Prepare data
+	var bp []string
+	for _, point := range points {
+		// Get name
+		name := point.Name()
+		// Convert UnixNano to Unix timestamps
+		timestamp := point.UnixNano() / 1000000000
+
+		for field_name, value := range point.Fields() {
+			// Convert value
+			value_str := fmt.Sprintf("%#v", value)
+			// Write graphite point
+			var graphitePoint string
+			if name == field_name {
+				graphitePoint = fmt.Sprintf("%s.%s %s %d\n",
+					strings.Replace(point.Tags()["host"], ".", "_", -1),
+					strings.Replace(name, ".", "_", -1),
+					value_str,
+					timestamp)
+			} else {
+				graphitePoint = fmt.Sprintf("%s.%s.%s %s %d\n",
+					strings.Replace(point.Tags()["host"], ".", "_", -1),
+					strings.Replace(name, ".", "_", -1),
+					strings.Replace(field_name, ".", "_", -1),
+					value_str,
+					timestamp)
+			}
+			if g.Prefix != "" {
+				graphitePoint = fmt.Sprintf("%s.%s", g.Prefix, graphitePoint)
+			}
+			bp = append(bp, graphitePoint)
+			//fmt.Printf(graphitePoint)
+		}
+	}
+	graphitePoints := strings.Join(bp, "")
+
+	// This will get set to nil if a successful write occurs
+	err := errors.New("Could not write to any Graphite server in cluster\n")
+
+	// Send data to a random server
+	p := rand.Perm(len(g.conns))
+	for _, n := range p {
+		if _, e := fmt.Fprintf(g.conns[n], graphitePoints); e != nil {
+			// Error
+			log.Println("ERROR: " + err.Error())
+			// Let's try the next one
+		} else {
+			// Success
+			err = nil
+			break
+		}
+	}
+	// try to reconnect
+	if err != nil {
+		g.Connect()
+	}
+	return err
+}
+
+func init() {
+	outputs.Add("graphite", func() outputs.Output {
+		return &Graphite{}
+	})
+}