Loadbalancer: Add support for Redis

Add support for Redis in the loadbalancer setup.
Redis loadbalancing system is particular as it does not provide
clustering capabilities yet, hence this pattern[1] will be applied.

[1] https://github.com/falsecz/haredis

Change-Id: I80a6c284af9eceb6b669a03c5d93256261523331

1 files changed, 30 insertions, 0 deletions

diff --git a/templates/redis/redis-notifications.sh.erb b/templates/redis/redis-notifications.sh.erb
new file mode 100644
index 0000000..aa368e9
--- /dev/null
+++ b/templates/redis/redis-notifications.sh.erb
@@ -0,0 +1,30 @@
+#!/bin/bash
+HAPROXY="<%= @haproxy_monitor_ip %>:1993"
+CMD="$1"
+ARGS="$2"
+ARG1=`echo $ARGS | awk '{print $1}'`
+
+
+call_curl () {
+	DATA=`echo "s=$1&action=$2&b=%234" | sed -e s/:/%3A/`
+	curl --silent -o /dev/null $HAPROXY --data "$DATA"
+	echo curl $HAPROXY --data "$DATA"
+	return 0
+}
+
+
+[ "$CMD" = "+odown" ] && [ "$ARG1" = "master" ] && \
+	call_curl `echo $ARGS | awk '{print $2 ":" $3 ":" $4}'` 'disable'
+
+[ "$CMD" = "+sdown" ] && [ "$ARG1" = "slave" ] && \
+	call_curl `echo $ARGS | awk '{print $6 ":" $3 ":" $4}'` 'disable'
+
+[ "$CMD" = "+switch-master" ] && \
+	call_curl `echo $ARGS | awk '{print $1 ":" $4 ":" $5}'` 'enable' &&
+	call_curl `echo $ARGS | awk '{print $1 ":" $2 ":" $3}'` 'disable'
+
+[ "$CMD" = "-odown" ] && [ "$ARG1" = "master" ] && \
+	call_curl `echo $ARGS | awk '{print $2 ":" $3 ":" $4}'` 'enable'
+
+# without exit code, sentinel thinks the script is still running and locks any further execution
+exit 0