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emit.go
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/
emit.go
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package metric
import (
"time"
"code.cloudfoundry.org/lager"
"github.com/The-Cloud-Source/goryman"
)
type eventEmission struct {
event goryman.Event
logger lager.Logger
}
var riemannClient *goryman.GorymanClient
var eventHost string
var eventTags []string
var eventAttributes map[string]string
var eventPrefix string
var clientConnected bool
var emissions = make(chan eventEmission, 1000)
func Initialize(logger lager.Logger, riemannAddr string, host string, tags []string, attributes map[string]string, prefix string) {
client := goryman.NewGorymanClient(riemannAddr)
riemannClient = client
eventHost = host
eventTags = tags
eventAttributes = attributes
eventPrefix = prefix
go emitLoop()
}
func emit(logger lager.Logger, event goryman.Event) {
logger.Debug("emit")
if riemannClient == nil {
return
}
if eventPrefix != "" {
event.Service = eventPrefix + event.Service
}
event.Host = eventHost
event.Time = time.Now().Unix()
event.Tags = append(event.Tags, eventTags...)
mergedAttributes := map[string]string{}
for k, v := range eventAttributes {
mergedAttributes[k] = v
}
if event.Attributes != nil {
for k, v := range event.Attributes {
mergedAttributes[k] = v
}
}
event.Attributes = mergedAttributes
select {
case emissions <- eventEmission{logger: logger, event: event}:
default:
logger.Error("queue-full", nil)
}
}
func emitLoop() {
for emission := range emissions {
if !clientConnected {
err := riemannClient.Connect()
if err != nil {
emission.logger.Error("connection-failed", err)
continue
}
clientConnected = true
}
err := riemannClient.SendEvent(&emission.event)
if err != nil {
emission.logger.Error("failed-to-emit", err)
if err := riemannClient.Close(); err != nil {
emission.logger.Error("failed-to-close", err)
}
clientConnected = false
}
}
}