postgresql_db: add comment feature

changelogs/fragments/0-postgresql_db.yml

@@ -0,0 +1,2 @@
+minor_changes:
+- postgresql_db - add the ``comment`` argument (https://github.com/ansible-collections/community.postgresql/issues/614).

plugins/modules/postgresql_db.py

@@ -131,6 +131,12 @@
     type: bool
     default: true
     version_added: '0.2.0'
+  comment:
+    description:
+    - Sets a comment on the database.
+    - To reset the comment, pass an empty string.
+    type: str
+    version_added: '3.3.0'
 seealso:
 - name: CREATE DATABASE reference
   description: Complete reference of the CREATE DATABASE command documentation.
@@ -165,6 +171,7 @@
 - name: Create a new database with name "acme"
   community.postgresql.postgresql_db:
     name: acme
+    comment: My test DB
 
 # Note: If a template different from "template0" is specified,
 # encoding and locale settings must match those of the template.
@@ -310,6 +317,13 @@ def set_conn_limit(cursor, db, conn_limit):
     return True
 
 
+def set_comment(cursor, db, comment):
+    query = "COMMENT ON DATABASE \"%s\" IS '%s'" % (db, comment)
+    executed_commands.append(query)
+    cursor.execute(query)
+    return True
+
+
 def get_encoding_id(cursor, encoding):
     query = "SELECT pg_char_to_encoding(%(encoding)s) AS encoding_id;"
     cursor.execute(query, {'encoding': encoding})
@@ -321,7 +335,8 @@ def get_db_info(cursor, db):
     SELECT rolname AS owner,
     pg_encoding_to_char(encoding) AS encoding, encoding AS encoding_id,
     datcollate AS lc_collate, datctype AS lc_ctype, pg_database.datconnlimit AS conn_limit,
-    spcname AS tablespace
+    spcname AS tablespace,
+    pg_catalog.shobj_description(pg_database.oid, 'pg_database') AS comment
     FROM pg_database
     JOIN pg_roles ON pg_roles.oid = pg_database.datdba
     JOIN pg_tablespace ON pg_tablespace.oid = pg_database.dattablespace
@@ -367,7 +382,7 @@ def db_delete(cursor, db, force=False):
         return False
 
 
-def db_create(cursor, db, owner, template, encoding, lc_collate, lc_ctype, conn_limit, tablespace):
+def db_create(cursor, db, owner, template, encoding, lc_collate, lc_ctype, conn_limit, tablespace, comment):
     params = dict(enc=encoding, collate=lc_collate, ctype=lc_ctype, conn_limit=conn_limit, tablespace=tablespace)
     if not db_exists(cursor, db):
         query_fragments = ['CREATE DATABASE "%s"' % db]
@@ -388,6 +403,8 @@ def db_create(cursor, db, owner, template, encoding, lc_collate, lc_ctype, conn_
         query = ' '.join(query_fragments)
         executed_commands.append(cursor.mogrify(query, params))
         cursor.execute(query, params)
+        if comment:
+            set_comment(cursor, db, comment)
         return True
     else:
         db_info = get_db_info(cursor, db)
@@ -418,10 +435,13 @@ def db_create(cursor, db, owner, template, encoding, lc_collate, lc_ctype, conn_
             if tablespace and tablespace != db_info['tablespace']:
                 changed = set_tablespace(cursor, db, tablespace)
 
+            if comment is not None and comment != db_info['comment']:
+                changed = set_comment(cursor, db, comment)
+
             return changed
 
 
-def db_matches(cursor, db, owner, template, encoding, lc_collate, lc_ctype, conn_limit, tablespace):
+def db_matches(cursor, db, owner, template, encoding, lc_collate, lc_ctype, conn_limit, tablespace, comment):
     if not db_exists(cursor, db):
         return False
     else:
@@ -438,6 +458,8 @@ def db_matches(cursor, db, owner, template, encoding, lc_collate, lc_ctype, conn
             return False
         elif tablespace and tablespace != db_info['tablespace']:
             return False
+        elif comment is not None and comment != db_info['comment']:
+            return False
         else:
             return True
 
@@ -650,6 +672,7 @@ def main():
         dump_extra_args=dict(type='str', default=None),
         trust_input=dict(type='bool', default=True),
         force=dict(type='bool', default=False),
+        comment=dict(type='str', default=None),
     )
 
     module = AnsibleModule(
@@ -674,6 +697,7 @@ def main():
     dump_extra_args = module.params['dump_extra_args']
     trust_input = module.params['trust_input']
     force = module.params['force']
+    comment = module.params['comment']
 
     if state == 'rename':
         if not target:
@@ -722,7 +746,7 @@ def main():
                 changed = db_exists(cursor, db)
 
             elif state == "present":
-                changed = not db_matches(cursor, db, owner, template, encoding, lc_collate, lc_ctype, conn_limit, tablespace)
+                changed = not db_matches(cursor, db, owner, template, encoding, lc_collate, lc_ctype, conn_limit, tablespace, comment)
 
             elif state == "rename":
                 changed = rename_db(module, cursor, db, target, check_mode=True)
@@ -737,7 +761,7 @@ def main():
 
         elif state == "present":
             try:
-                changed = db_create(cursor, db, owner, template, encoding, lc_collate, lc_ctype, conn_limit, tablespace)
+                changed = db_create(cursor, db, owner, template, encoding, lc_collate, lc_ctype, conn_limit, tablespace, comment)
             except SQLParseError as e:
                 module.fail_json(msg=to_native(e), exception=traceback.format_exc())
 

tests/integration/targets/postgresql_db/tasks/main.yml

@@ -45,3 +45,6 @@
 
 # Simple test to create and then drop with force
 - import_tasks: manage_database.yml
+
+# Test the comment feature
+- import_tasks: postgresql_db_comment.yml

tests/integration/targets/postgresql_db/tasks/postgresql_db_comment.yml

@@ -0,0 +1,173 @@
+# Test code for the postgresql_db comment module feature
+# Copyright: (c) 2019, Andrew Klychkov (@Andersson007) <[email protected]>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+- name: Set parameters we use with most of tasks
+  ansible.builtin.set_fact:
+    task_parameters: &task_parameters
+      become_user: "{{ pg_user }}"
+      become: true
+      register: result
+
+- name: Create DB with comment
+  <<: *task_parameters
+  postgresql_db:
+    state: present
+    name: comment_db
+    login_user: "{{ pg_user }}"
+    comment: Test DB comment 1
+
+- name: Assert the executed commands
+  assert:
+    that:
+       - result is changed
+       - result.db == "comment_db"
+       - result.executed_commands == ['CREATE DATABASE "comment_db"', "COMMENT ON DATABASE \"comment_db\" IS 'Test DB comment 1'"]
+
+- name: Get the DB comment
+  <<: *task_parameters
+  postgresql_query:
+    login_user: "{{ pg_user }}"
+    query: "SELECT pg_catalog.shobj_description(d.oid, 'pg_database') AS comment FROM pg_catalog.pg_database d WHERE datname = 'comment_db'"
+
+- name: Check the comments match
+  assert:
+    that:
+      - result.query_result[0]['comment'] == "Test DB comment 1"
+
+
+- name: Create DB with another comment in check mode
+  <<: *task_parameters
+  postgresql_db:
+    state: present
+    name: comment_db
+    login_user: "{{ pg_user }}"
+    comment: Another comment
+  check_mode: true
+
+- name: Assert the result
+  assert:
+    that:
+       - result is changed
+
+- name: Check the comment
+  <<: *task_parameters
+  postgresql_query:
+    login_user: "{{ pg_user }}"
+    query: "SELECT pg_catalog.shobj_description(d.oid, 'pg_database') AS comment FROM pg_catalog.pg_database d WHERE datname = 'comment_db'"
+
+- name: Check the comment hasn't changed
+  assert:
+    that:
+      - result.query_result[0]['comment'] == "Test DB comment 1"
+
+
+- name: Create DB with another comment in real mode
+  <<: *task_parameters
+  postgresql_db:
+    state: present
+    name: comment_db
+    login_user: "{{ pg_user }}"
+    comment: Another comment
+
+- name: Assert the result
+  assert:
+    that:
+       - result is changed
+       - result.executed_commands == ["COMMENT ON DATABASE \"comment_db\" IS 'Another comment'"]
+
+- name: Check the comment
+  <<: *task_parameters
+  postgresql_query:
+    login_user: "{{ pg_user }}"
+    query: "SELECT pg_catalog.shobj_description(d.oid, 'pg_database') AS comment FROM pg_catalog.pg_database d WHERE datname = 'comment_db'"
+
+- name: Check the comments match
+  assert:
+    that:
+      - result.query_result[0]['comment'] == "Another comment"
+
+
+- name: Create DB with the same comment in real mode
+  <<: *task_parameters
+  postgresql_db:
+    state: present
+    name: comment_db
+    login_user: "{{ pg_user }}"
+    comment: Another comment
+
+- name: Assert the result
+  assert:
+    that:
+       - result is not changed
+       - result.executed_commands == []
+
+- name: Check the comment
+  <<: *task_parameters
+  postgresql_query:
+    login_user: "{{ pg_user }}"
+    query: "SELECT pg_catalog.shobj_description(d.oid, 'pg_database') AS comment FROM pg_catalog.pg_database d WHERE datname = 'comment_db'"
+
+- name: Check the comments match
+  assert:
+    that:
+      - result.query_result[0]['comment'] == "Another comment"
+
+
+- name: Not specifying the comment will not erase it
+  <<: *task_parameters
+  postgresql_db:
+    state: present
+    name: comment_db
+    login_user: "{{ pg_user }}"
+
+- name: Assert the result
+  assert:
+    that:
+       - result is not changed
+       - result.executed_commands == []
+
+- name: Check the comment
+  <<: *task_parameters
+  postgresql_query:
+    login_user: "{{ pg_user }}"
+    query: "SELECT pg_catalog.shobj_description(d.oid, 'pg_database') AS comment FROM pg_catalog.pg_database d WHERE datname = 'comment_db'"
+
+- name: Check the comments match
+  assert:
+    that:
+      - result.query_result[0]['comment'] == "Another comment"
+
+
+- name: Reset the comment
+  <<: *task_parameters
+  postgresql_db:
+    state: present
+    name: comment_db
+    login_user: "{{ pg_user }}"
+    comment: ''
+
+- name: Assert the result
+  assert:
+    that:
+       - result is changed
+       - result.executed_commands == ["COMMENT ON DATABASE \"comment_db\" IS ''"]
+
+- name: Check the comment
+  <<: *task_parameters
+  postgresql_query:
+    login_user: "{{ pg_user }}"
+    query: "SELECT pg_catalog.shobj_description(d.oid, 'pg_database') AS comment FROM pg_catalog.pg_database d WHERE datname = 'comment_db'"
+
+- name: Check the comments match
+  assert:
+    that:
+      - result.query_result[0]['comment'] == None
+
+
+- name: Clean up
+  <<: *task_parameters
+  postgresql_db:
+    state: absent
+    name: comment_db
+    login_user: "{{ pg_user }}"