telegraf/plugins/inputs/nsq_consumer/nsq_consumer.go

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package nsq_consumer
import (
"log"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
"github.com/influxdata/telegraf/plugins/parsers"
"github.com/nsqio/go-nsq"
)
//NSQConsumer represents the configuration of the plugin
type NSQConsumer struct {
Server string
Topic string
Channel string
MaxInFlight int
parser parsers.Parser
consumer *nsq.Consumer
acc telegraf.Accumulator
}
var sampleConfig = `
## An string representing the NSQD TCP Endpoint
server = "localhost:4150"
topic = "telegraf"
channel = "consumer"
max_in_flight = 100
## Data format to consume.
## Each data format has it's own unique set of configuration options, read
## more about them here:
## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
data_format = "influx"
`
func init() {
inputs.Add("nsq_consumer", func() telegraf.Input {
return &NSQConsumer{}
})
}
// SetParser takes the data_format from the config and finds the right parser for that format
func (n *NSQConsumer) SetParser(parser parsers.Parser) {
n.parser = parser
}
// SampleConfig returns config values for generating a sample configuration file
func (n *NSQConsumer) SampleConfig() string {
return sampleConfig
}
// Description prints description string
func (n *NSQConsumer) Description() string {
return "Read NSQ topic for metrics."
}
// Start pulls data from nsq
func (n *NSQConsumer) Start(acc telegraf.Accumulator) error {
n.acc = acc
n.connect()
n.consumer.AddConcurrentHandlers(nsq.HandlerFunc(func(message *nsq.Message) error {
metrics, err := n.parser.Parse(message.Body)
if err != nil {
log.Printf("E! NSQConsumer Parse Error\nmessage:%s\nerror:%s", string(message.Body), err.Error())
return nil
}
for _, metric := range metrics {
n.acc.AddFields(metric.Name(), metric.Fields(), metric.Tags(), metric.Time())
}
message.Finish()
return nil
}), n.MaxInFlight)
n.consumer.ConnectToNSQD(n.Server)
return nil
}
// Stop processing messages
func (n *NSQConsumer) Stop() {
n.consumer.Stop()
}
// Gather is a noop
func (n *NSQConsumer) Gather(acc telegraf.Accumulator) error {
return nil
}
func (n *NSQConsumer) connect() error {
if n.consumer == nil {
config := nsq.NewConfig()
config.MaxInFlight = n.MaxInFlight
consumer, err := nsq.NewConsumer(n.Topic, n.Channel, config)
if err != nil {
return err
}
n.consumer = consumer
}
return nil
}