fix(logger): fix publish loop

before, the logger's publish loop would be searching for a TCP
connection. Since the logger runs on UDP, the publish loop would
not find it running and would run forever. This changes netstat
to search over UDP for the logger instead, allowing it to publish
its values to etcd.

fixes #738

Author: Matthew Fisher

logger/bin/boot

@@ -24,8 +24,8 @@ SERVICE_PID=$!
 
 # smart shutdown on SIGINT and SIGTERM
 function on_exit() {
-	kill -TERM $SERVICE_PID
-	wait $SERVICE_PID 2>/dev/null
+    kill -TERM $SERVICE_PID
+    wait $SERVICE_PID 2>/dev/null
 }
 trap on_exit INT TERM
 
@@ -34,24 +34,24 @@ echo deis-logger running...
 # publish the service to etcd using the injected PORT
 if [[ ! -z $PUBLISH ]]; then
 
-	# configure service discovery
-	PORT=${PORT:-514}
-	PROTO=${PROTO:-tcp}
+    # configure service discovery
+    PORT=${PORT:-514}
+    PROTO=${PROTO:-udp}
 
-	set +e
+    set +e
 
-	# wait for the service to become available on PUBLISH port
-	sleep 1 && while [[ -z $(netstat -lnt | awk "\$6 == \"LISTEN\" && \$4 ~ \".$PUBLISH\" && \$1 ~ \"$PROTO.?\"") ]] ; do sleep 1; done
+    # wait for the service to become available on PUBLISH port
+    sleep 1 && while [[ -z $(netstat -lnu | awk "\$4 ~ \".$PUBLISH\" && \$1 ~ \"$PROTO.?\"") ]] ; do sleep 1; done
 
-	# while the port is listening, publish to etcd
-	while [[ ! -z $(netstat -lnt | awk "\$6 == \"LISTEN\" && \$4 ~ \".$PUBLISH\" && \$1 ~ \"$PROTO.?\"") ]] ; do
-		etcdctl --no-sync -C $ETCD set $ETCD_PATH/host $HOST --ttl $ETCD_TTL >/dev/null
-		etcdctl --no-sync -C $ETCD set $ETCD_PATH/port $PORT --ttl $ETCD_TTL >/dev/null
-		sleep $(($ETCD_TTL/2)) # sleep for half the TTL
-	done
+    # while the port is listening, publish to etcd
+    while [[ ! -z $(netstat -lnu | awk "\$4 ~ \".$PUBLISH\" && \$1 ~ \"$PROTO.?\"") ]] ; do
+        etcdctl -C $ETCD set --ttl $ETCD_TTL $ETCD_PATH/host $HOST --no-sync >/dev/null
+        etcdctl -C $ETCD set --ttl $ETCD_TTL $ETCD_PATH/port $PORT --no-sync >/dev/null
+        sleep $(($ETCD_TTL/2)) # sleep for half the TTL
+    done
 
-	# if the loop quits, something went wrong
-	exit 1
+    # if the loop quits, something went wrong
+    exit 1
 
 fi