Install memcached, conditionally.

defaults/main.yml

@@ -191,8 +191,10 @@ pgpool_black_function_list: 'nextval,setval'
 pgpool_allow_sql_comments: 'on'
 pgpool_fail_over_on_backend_error: 'on'
 pgpool_relcache_expire: 3600
-pgpool_memory_cache_enabled: 'off'
-pgpool_memqcache_method: memcached
+#
+pgpool_memory_cache_enabled: False
+# memcached, shmem
+pgpool_memqcache_method: shmem
 pgpool_memqcache_memcached_host: localhost
 pgpool_memqcache_memcached_port: 11211
 pgpool_memqcache_expire: 0

meta/main.yml

@@ -20,4 +20,12 @@ galaxy_info:
   galaxy_tags:
     - postgresql
 
-dependencies: []
+dependencies:
+  - src: git+https://gitea-s2i2s.isti.cnr.it/ISTI-ansible-roles/ansible-role-memcached.git
+    version: master
+    name: memcached
+    state: latest
+    when:
+      - pgpool_memory_cache_enabled
+      - pgpool_memqcache_method == "memcached"
+      - pgpool_memqcache_memcached_host == "localhost"

templates/pgpool.conf.j2

@@ -623,10 +623,11 @@ check_unlogged_table = on
                                    # and you want to save access to primary/master, you could turn this off.
                                    # Default is on.
 
+{% if pgpool_memory_cache_enabled %}
 #------------------------------------------------------------------------------
 # IN MEMORY QUERY MEMORY CACHE
 #------------------------------------------------------------------------------
-memory_cache_enabled = {{ pgpool_memory_cache_enabled }}
+memory_cache_enabled = on
 								   # If on, use the memory cache functionality, off by default
 memqcache_method = '{{ pgpool_memqcache_method }}'
 								   # Cache storage method. either 'shmem'(shared memory) or
@@ -679,3 +680,14 @@ black_memqcache_table_list = ''
                                    # Comma separated list of table names not to memcache
                                    # that don't write to database
                                    # Regexp are accepted
+{% else %}
+#------------------------------------------------------------------------------
+# IN MEMORY QUERY MEMORY CACHE
+#------------------------------------------------------------------------------
+memory_cache_enabled = ff
+								   # If on, use the memory cache functionality, off by default
+memqcache_method = 'shmem'
+								   # Cache storage method. either 'shmem'(shared memory) or
+								   # 'memcached'. 'shmem' by default
+                                   # (change requires restart)
+{% endif %}