/
statsd.go
74 lines (64 loc) · 1.77 KB
/
statsd.go
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package persistence
import (
"fmt"
"sync"
"time"
"github.com/DataDog/datadog-go/statsd"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/pkg/errors"
)
var (
StatsdClientNotInitialized = errors.New("statsd client not initialized")
statsdClient *statsd.Client
statsdMu sync.Mutex
)
func InitStatsd(port, namespace string) (*statsd.Client, error) {
statsdMu.Lock()
defer statsdMu.Unlock()
if statsdClient == nil {
sess, err := session.NewSession(aws.NewConfig())
if err != nil {
return nil, errors.Wrap(err, "failed to init AWS session")
} else {
ip, err := getInstancePrivateIP(sess)
if err != nil {
return nil, errors.Wrap(err, "failed to find instance ip")
}
c, err := statsd.New(fmt.Sprintf("%s:%s", ip, port))
if err != nil {
return nil, errors.Wrapf(err, "failed to init statsd client targeting ip %s", ip)
}
// prefix every metric with the app name
c.Namespace = namespace
statsdClient = c
}
}
return statsdClient, nil
}
func Statsd() *statsd.Client {
return statsdClient
}
func MaybeSendStatsdTiming(name string, value time.Duration, tags []string, rate float64) error {
client := Statsd()
if client == nil {
return StatsdClientNotInitialized
}
return client.Timing(name, value, tags, rate)
}
func MaybeSendStatsdGauge(name string, value float64, tags []string, rate float64) error {
client := Statsd()
if client == nil {
return StatsdClientNotInitialized
}
return client.Gauge(name, value, tags, rate)
}
func getInstancePrivateIP(sess *session.Session) (string, error) {
ec2metadataSvc := ec2metadata.New(sess)
doc, err := ec2metadataSvc.GetInstanceIdentityDocument()
if err != nil {
return "", err
}
return doc.PrivateIP, nil
}