From a440cf6106596226bd776d476f643925739349b1 Mon Sep 17 00:00:00 2001
From: embs <embs@cin.ufpe.br>
Date: Fri, 22 Sep 2017 13:33:06 -0300
Subject: [PATCH] Add local IP address to Zipkin tracing

Related to https://github.com/microservices-demo/orders/issues/48
---
 cmd/paymentsvc/main.go | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/cmd/paymentsvc/main.go b/cmd/paymentsvc/main.go
index c9556b9..fa8270f 100644
--- a/cmd/paymentsvc/main.go
+++ b/cmd/paymentsvc/main.go
@@ -3,9 +3,11 @@ package main
 import (
 	"flag"
 	"fmt"
+	"net"
 	"net/http"
 	"os"
 	"os/signal"
+	"strings"
 	"syscall"
 
 	"github.com/go-kit/kit/log"
@@ -35,6 +37,15 @@ func main() {
 			logger = log.NewContext(logger).With("ts", log.DefaultTimestampUTC)
 			logger = log.NewContext(logger).With("caller", log.DefaultCaller)
 		}
+		// Find service local IP.
+		conn, err := net.Dial("udp", "8.8.8.8:80")
+		if err != nil {
+			logger.Log("err", err)
+			os.Exit(1)
+		}
+		localAddr := conn.LocalAddr().(*net.UDPAddr)
+		host := strings.Split(localAddr.String(), ":")[0]
+		defer conn.Close()
 		if *zip == "" {
 			tracer = stdopentracing.NoopTracer{}
 		} else {
@@ -49,7 +60,7 @@ func main() {
 				os.Exit(1)
 			}
 			tracer, err = zipkin.NewTracer(
-				zipkin.NewRecorder(collector, false, fmt.Sprintf("localhost:%v", port), ServiceName),
+				zipkin.NewRecorder(collector, false, fmt.Sprintf("%v:%v", host, port), ServiceName),
 			)
 			if err != nil {
 				logger.Log("err", err)