Configure redis to avoid db overlaps

scripts/_common.sh

@@ -86,6 +86,49 @@ ynh_smart_mktemp () {
         echo "$(mktemp --directory --tmpdir="$tmpdir")"
 }
 
+#=================================================
+# REDIS HELPERS
+#=================================================
+
+# get the first available redis database
+#
+# usage: ynh_redis_get_free_db
+# | returns: the database number to use
+ynh_redis_get_free_db() {
+	local result max db
+	result=$(redis-cli INFO keyspace)
+
+	# get the num
+	max=$(cat /etc/redis/redis.conf | grep ^databases | grep -Eow "[0-9]+")
+
+	db=0
+	# default Debian setting is 15 databases
+	for i in $(seq 0 "$max")
+	do
+	 	if ! echo "$result" | grep -q "db$i"
+	 	then
+			db=$i
+	 		break 1
+ 		fi
+ 		db=-1
+	done
+
+	test "$db" -eq -1 && ynh_die --message="No available Redis databases..."
+
+	echo "$db"
+}
+
+# Create a master password and set up global settings
+# Please always call this script in install and restore scripts
+#
+# usage: ynh_redis_remove_db database
+# | arg: database - the database to erase
+ynh_redis_remove_db() {
+	local db=$1
+	redis-cli -n "$db" flushall
+}
+
+
 #=================================================
 # FUTURE OFFICIAL HELPERS
 #=================================================

scripts/install

@@ -206,6 +206,9 @@ exec_occ config:import "$nc_conf"
 # Then remove the config file
 ynh_secure_remove --file="$nc_conf"
 
+redis_db=$(ynh_redis_get_free_db)
+ynh_app_setting_set --app="$app" --key=redis_db --value="$redis_db"
+
 # Load the additional config file (used also for upgrade)
 nc_conf="$final_path/config.json"
 ynh_add_config --template="../conf/config.json" --destination="$nc_conf"

scripts/remove

@@ -21,6 +21,7 @@ db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 db_user=$db_name
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 datadir=$(ynh_app_setting_get --app=$app --key=datadir)
+redis_db=$(ynh_app_setting_get --app=$app --key=redis_db)
 
 #=================================================
 # STANDARD REMOVE
@@ -40,6 +41,13 @@ ynh_script_progression --message="Removing the MySQL database..." --weight=5
 # Remove a database if it exists, along with the associated user
 ynh_mysql_remove_db --db_user=$db_user --db_name=$db_name
 
+#=================================================
+# REMOVE THE REDIS DATABASE
+#=================================================
+ynh_script_progression --message="Removing the redis database..."
+
+ynh_redis_remove_db "$redis_db"
+
 #=================================================
 # REMOVE APP MAIN DIR
 #=================================================

scripts/upgrade

@@ -27,6 +27,7 @@ user_home=$(ynh_app_setting_get --app=$app --key=user_home)
 maintenance_mode=$(ynh_app_setting_get --app=$app --key=maintenance_mode)
 fpm_footprint=$(ynh_app_setting_get --app=$app --key=fpm_footprint)
 fpm_usage=$(ynh_app_setting_get --app=$app --key=fpm_usage)
+redis_db=$(ynh_app_setting_get --app=$app --key=redis_db)
 
 #=================================================
 # CHECK VERSION