telegraf/outputs/amqp/amqp.go

125 lines
2.4 KiB
Go

package amqp
import (
"fmt"
"log"
"sync"
"time"
"github.com/influxdb/influxdb/client/v2"
"github.com/influxdb/telegraf/outputs"
"github.com/streadway/amqp"
)
type AMQP struct {
// AMQP brokers to send metrics to
URL string
// AMQP exchange
Exchange string
// Routing Key Tag
RoutingTag string `toml:"routing_tag"`
channel *amqp.Channel
sync.Mutex
}
var sampleConfig = `
# AMQP url
url = "amqp://localhost:5672/influxdb"
# AMQP exchange
exchange = "telegraf"
# Telegraf tag to use as a routing key
# ie, if this tag exists, it's value will be used as the routing key
routing_tag = "host"
`
func (q *AMQP) Connect() error {
q.Lock()
defer q.Unlock()
connection, err := amqp.Dial(q.URL)
if err != nil {
return err
}
channel, err := connection.Channel()
if err != nil {
return fmt.Errorf("Failed to open a channel: %s", err)
}
err = channel.ExchangeDeclare(
q.Exchange, // name
"topic", // type
true, // durable
false, // delete when unused
false, // internal
false, // no-wait
nil, // arguments
)
if err != nil {
return fmt.Errorf("Failed to declare an exchange: %s", err)
}
q.channel = channel
go func() {
log.Printf("Closing: %s", <-connection.NotifyClose(make(chan *amqp.Error)))
log.Printf("Trying to reconnect")
for err := q.Connect(); err != nil; err = q.Connect() {
log.Println(err)
time.Sleep(10 * time.Second)
}
}()
return nil
}
func (q *AMQP) Close() error {
return q.channel.Close()
}
func (q *AMQP) SampleConfig() string {
return sampleConfig
}
func (q *AMQP) Description() string {
return "Configuration for the AMQP server to send metrics to"
}
func (q *AMQP) Write(points []*client.Point) error {
q.Lock()
defer q.Unlock()
if len(points) == 0 {
return nil
}
for _, p := range points {
// Combine tags from Point and BatchPoints and grab the resulting
// line-protocol output string to write to AMQP
var value, key string
value = p.String()
if q.RoutingTag != "" {
if h, ok := p.Tags()[q.RoutingTag]; ok {
key = h
}
}
err := q.channel.Publish(
q.Exchange, // exchange
key, // routing key
false, // mandatory
false, // immediate
amqp.Publishing{
ContentType: "text/plain",
Body: []byte(value),
})
if err != nil {
return fmt.Errorf("FAILED to send amqp message: %s", err)
}
}
return nil
}
func init() {
outputs.Add("amqp", func() outputs.Output {
return &AMQP{}
})
}