136 lines
2.8 KiB
Go
136 lines
2.8 KiB
Go
package nats
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import (
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"fmt"
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nats_client "github.com/nats-io/nats"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/internal"
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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 NATS struct {
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// Servers is the NATS server pool to connect to
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Servers []string
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// Credentials
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Username string
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Password string
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// NATS subject to publish metrics to
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Subject string
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// Path to CA file
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SSLCA string `toml:"ssl_ca"`
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// Path to host cert file
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SSLCert string `toml:"ssl_cert"`
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// Path to cert key file
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SSLKey string `toml:"ssl_key"`
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// Use SSL but skip chain & host verification
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InsecureSkipVerify bool
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conn *nats_client.Conn
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serializer serializers.Serializer
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}
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var sampleConfig = `
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## URLs of NATS servers
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servers = ["nats://localhost:4222"]
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## Optional credentials
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# username = ""
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# password = ""
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## NATS subject for producer messages
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subject = "telegraf"
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## Optional SSL Config
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# ssl_ca = "/etc/telegraf/ca.pem"
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# ssl_cert = "/etc/telegraf/cert.pem"
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# ssl_key = "/etc/telegraf/key.pem"
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## Use SSL but skip chain & host verification
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# insecure_skip_verify = false
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## Data format to output.
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## Each data format has it's own unique set of configuration options, read
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## more about them here:
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## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
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data_format = "influx"
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`
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func (n *NATS) SetSerializer(serializer serializers.Serializer) {
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n.serializer = serializer
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}
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func (n *NATS) Connect() error {
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var err error
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// set default NATS connection options
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opts := nats_client.DefaultOptions
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// override max reconnection tries
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opts.MaxReconnect = -1
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// override servers, if any were specified
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opts.Servers = n.Servers
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// override authentication, if any was specified
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if n.Username != "" {
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opts.User = n.Username
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opts.Password = n.Password
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}
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// override TLS, if it was specified
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tlsConfig, err := internal.GetTLSConfig(
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n.SSLCert, n.SSLKey, n.SSLCA, n.InsecureSkipVerify)
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if err != nil {
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return err
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}
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if tlsConfig != nil {
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// set NATS connection TLS options
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opts.Secure = true
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opts.TLSConfig = tlsConfig
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}
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// try and connect
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n.conn, err = opts.Connect()
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return err
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}
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func (n *NATS) Close() error {
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n.conn.Close()
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return nil
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}
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func (n *NATS) SampleConfig() string {
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return sampleConfig
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}
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func (n *NATS) Description() string {
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return "Send telegraf measurements to NATS"
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}
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func (n *NATS) Write(metrics []telegraf.Metric) error {
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if len(metrics) == 0 {
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return nil
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}
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for _, metric := range metrics {
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buf, err := n.serializer.Serialize(metric)
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if err != nil {
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return err
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}
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err = n.conn.Publish(n.Subject, buf)
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if err != nil {
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return fmt.Errorf("FAILED to send NATS message: %s", err)
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}
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}
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return nil
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}
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func init() {
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outputs.Add("nats", func() telegraf.Output {
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return &NATS{}
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})
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}
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