telegraf/plugins/outputs/nats/nats.go

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