123 lines
2.8 KiB
Go
123 lines
2.8 KiB
Go
package graphite
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import (
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"errors"
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"log"
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"math/rand"
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"net"
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"time"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/outputs"
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"github.com/influxdata/telegraf/plugins/serializers"
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)
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type Graphite struct {
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// URL is only for backwards compatability
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Servers []string
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Prefix string
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Template string
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Timeout int
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conns []net.Conn
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}
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var sampleConfig = `
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## TCP endpoint for your graphite instance.
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## If multiple endpoints are configured, output will be load balanced.
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## Only one of the endpoints will be written to with each iteration.
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servers = ["localhost:2003"]
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## Prefix metrics name
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prefix = ""
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## Graphite output template
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## see https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
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template = "host.tags.measurement.field"
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## timeout in seconds for the write connection to graphite
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timeout = 2
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`
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func (g *Graphite) Connect() error {
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// Set default values
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if g.Timeout <= 0 {
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g.Timeout = 2
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}
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if len(g.Servers) == 0 {
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g.Servers = append(g.Servers, "localhost:2003")
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}
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// Get Connections
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var conns []net.Conn
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for _, server := range g.Servers {
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conn, err := net.DialTimeout("tcp", server, time.Duration(g.Timeout)*time.Second)
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if err == nil {
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conns = append(conns, conn)
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}
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}
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g.conns = conns
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return nil
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}
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func (g *Graphite) Close() error {
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// Closing all connections
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for _, conn := range g.conns {
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conn.Close()
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}
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return nil
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}
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func (g *Graphite) SampleConfig() string {
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return sampleConfig
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}
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func (g *Graphite) Description() string {
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return "Configuration for Graphite server to send metrics to"
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}
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// Choose a random server in the cluster to write to until a successful write
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// occurs, logging each unsuccessful. If all servers fail, return error.
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func (g *Graphite) Write(metrics []telegraf.Metric) error {
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// Prepare data
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var batch []byte
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s, err := serializers.NewGraphiteSerializer(g.Prefix, g.Template)
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if err != nil {
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return err
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}
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for _, metric := range metrics {
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buf, err := s.Serialize(metric)
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if err != nil {
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log.Printf("E! Error serializing some metrics to graphite: %s", err.Error())
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}
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batch = append(batch, buf...)
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}
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// This will get set to nil if a successful write occurs
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err = errors.New("Could not write to any Graphite server in cluster\n")
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// Send data to a random server
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p := rand.Perm(len(g.conns))
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for _, n := range p {
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if g.Timeout > 0 {
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g.conns[n].SetWriteDeadline(time.Now().Add(time.Duration(g.Timeout) * time.Second))
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}
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if _, e := g.conns[n].Write(batch); e != nil {
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// Error
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log.Println("E! Graphite Error: " + e.Error())
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// Let's try the next one
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} else {
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// Success
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err = nil
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break
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}
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}
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// try to reconnect
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if err != nil {
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g.Connect()
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}
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return err
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}
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func init() {
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outputs.Add("graphite", func() telegraf.Output {
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return &Graphite{}
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})
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}
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