Beta state fix (#538)

* Add reload process which writes state file.

marathon_lb.py

@@ -356,17 +356,15 @@ def config(apps, groups, bind_http_https, ssl_certs, templater,
     if "expose-fd listeners" not in config:
         if "stats socket /var/run/haproxy/socket" in config:
             logger.debug("Appending 'expose-fd listeners' to stats socket")
-            config = config.replace("stats socket /var/run/haproxy/socket",
-                "stats socket /var/run/haproxy/socket expose-fd listeners")
+            o = "stats socket /var/run/haproxy/socket"
+            n = "stats socket /var/run/haproxy/socket expose-fd listeners"
+            config = config.replace(o, n)
         else:
-            logger.debug(
-                ("Adding '"
-                "stats socket /var/run/haproxy/socket expose-fd listeners"
-                "' after 'global' line"))
-            config = config.replace("global",
-                ("global\n"
-                "  stats socket /var/run/haproxy/socket expose-fd listeners"),
-                1)
+            o = "global"
+            n = ("global\n"
+                 "  stats socket /var/run/haproxy/socket expose-fd listeners")
+            logger.debug("Creating new expose-fd listeners socket config")
+            config = config.replace(o, n, 1)
 
     userlists = str()
     frontends = str()

reload_haproxy.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+socat /var/run/haproxy/socket - <<< "show servers state" > /var/state/haproxy/global
+
+# "sv reload ${HAPROXY_SERVICE}" will be added here by /marathon-lb/run:

run

@@ -118,6 +118,8 @@ for arg in "$@"; do
     ARGS="$ARGS $escaped"
 done
 
+echo "sv reload ${HAPROXY_SERVICE}" >> /marathon-lb/reload_haproxy.sh
+
 cat > $LB_SERVICE/run << EOF
 #!/bin/sh
 exec 2>&1
@@ -127,7 +129,7 @@ exec /marathon-lb/marathon_lb.py \
     --syslog-socket $SYSLOG_SOCKET \
     --haproxy-config /marathon-lb/haproxy.cfg \
     --ssl-certs "${SSL_CERTS}" \
-    --command "sv reload ${HAPROXY_SERVICE}" \
+    --command "/marathon-lb/reload_haproxy.sh" \
     $ARGS
 EOF
 chmod 755 $LB_SERVICE/run

service/haproxy/run

@@ -1,9 +1,8 @@
 #!/bin/bash
 exec 2>&1
-export PIDFILE="/tmp/haproxy.pid"
 WHICH_HAPROXY=$(which haproxy)
 
 mkdir -p /var/state/haproxy
 mkdir -p /var/run/haproxy
 
-exec $WHICH_HAPROXY -W -p $PIDFILE -f /marathon-lb/haproxy.cfg -x /var/run/haproxy/socket -sf
+exec $WHICH_HAPROXY -W -f /marathon-lb/haproxy.cfg -x /var/run/haproxy/socket