add a hostname prefix to all statsd metrics

debian/changelog

+autoradio (0.3.2p1) unstable; urgency=medium
+
+  * Instrumentation fix.
+
+ -- ale <ale@incal.net>  Thu, 09 Oct 2014 08:45:50 +0100
+
 autoradio (0.3.2) unstable; urgency=medium
 
   * Add statsd instrumentation.

instrumentation/stats.go

@@ -2,7 +2,9 @@ package instrumentation
 
 import (
 	"flag"
+	"fmt"
 	"log"
+	"os"
 	"sync"
 
 	"github.com/cactus/go-statsd-client/statsd"
@@ -15,11 +17,21 @@ var (
 
 	clientInit sync.Once
 	client     *statsd.Client
+
+	prefix string
 )
 
+func init() {
+	hostname, err := os.Hostname()
+	if err != nil {
+		log.Fatal("Could not determine hostname: %v", err)
+	}
+	prefix = fmt.Sprintf("autoradio.%s.", hostname)
+}
+
 func getClient() *statsd.Client {
 	clientInit.Do(func() {
-		c, err := statsd.New(*statsdServer, "autoradio.")
+		c, err := statsd.New(*statsdServer, prefix)
 		if err != nil {
 			log.Fatal("Error initializing instrumentation: %v", err)
 		}