Make Sender so that it can't be implemented externally.

Author: keep94

senders/client.go

@@ -17,6 +17,7 @@ type Sender interface {
 	EventSender
 	internal.Flusher
 	Close()
+	private()
 }
 
 type wavefrontSender struct {
@@ -74,6 +75,9 @@ func (sender *wavefrontSender) Start() {
 	sender.eventHandler.Start()
 }
 
+func (sender *wavefrontSender) private() {
+}
+
 func (sender *wavefrontSender) SendMetric(name string, value float64, ts int64, source string, tags map[string]string) error {
 	line, err := metricLine(name, value, ts, source, tags, sender.defaultSource)
 	if err != nil {

senders/client_multi.go

@@ -54,6 +54,9 @@ func NewMultiSender(senders ...Sender) MultiSender {
 	return ms
 }
 
+func (ms *multiSender) private() {
+}
+
 func (ms *multiSender) SendMetric(name string, value float64, ts int64, source string, tags map[string]string) error {
 	var errors multiError
 	for _, sender := range ms.senders {

senders/client_noop.go

@@ -17,6 +17,9 @@ func NewWavefrontNoOpClient() (Sender, error) {
 	return defaultNoopClient, nil
 }
 
+func (sender *wavefrontNoOpSender) private() {
+}
+
 func (sender *wavefrontNoOpSender) Start() {
 	// no-op
 }