129 lines
2.7 KiB
Go
129 lines
2.7 KiB
Go
package nats
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import (
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"fmt"
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"log"
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"strings"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/internal/tls"
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"github.com/influxdata/telegraf/plugins/outputs"
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"github.com/influxdata/telegraf/plugins/serializers"
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"github.com/nats-io/nats.go"
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)
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type NATS struct {
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Servers []string `toml:"servers"`
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Secure bool `toml:"secure"`
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Username string `toml:"username"`
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Password string `toml:"password"`
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Credentials string `toml:"credentials"`
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Subject string `toml:"subject"`
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tls.ClientConfig
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conn *nats.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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## Optional NATS 2.0 and NATS NGS compatible user credentials
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# credentials = "/etc/telegraf/nats.creds"
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## NATS subject for producer messages
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subject = "telegraf"
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## Use Transport Layer Security
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# secure = false
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## Optional TLS Config
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# tls_ca = "/etc/telegraf/ca.pem"
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# tls_cert = "/etc/telegraf/cert.pem"
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# tls_key = "/etc/telegraf/key.pem"
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## Use TLS 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 its 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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opts := []nats.Option{
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nats.MaxReconnects(-1),
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}
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// override authentication, if any was specified
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if n.Username != "" {
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opts = append(opts, nats.UserInfo(n.Username, n.Password))
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}
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if n.Secure {
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tlsConfig, err := n.ClientConfig.TLSConfig()
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if err != nil {
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return err
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}
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opts = append(opts, nats.Secure(tlsConfig))
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}
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// try and connect
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n.conn, err = nats.Connect(strings.Join(n.Servers, ","), opts...)
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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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log.Printf("D! [outputs.nats] Could not serialize metric: %v", err)
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continue
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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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