Revert "postgres modules: move params mapping from main to connect_to_db (#55549)"

This reverts commit 2250257809.

lib/ansible/modules/database/postgresql/postgresql_set.py

@@ -155,21 +155,22 @@ context:
   sample: user
 '''
 
-try:
-    from psycopg2.extras import DictCursor
-except Exception:
-    # psycopg2 is checked by connect_to_db()
-    # from ansible.module_utils.postgres
-    pass
+PG_REQ_VER = 90400
 
 from copy import deepcopy
 
-from ansible.module_utils.basic import AnsibleModule
+try:
+    import psycopg2
+    HAS_PSYCOPG2 = True
+except ImportError:
+    HAS_PSYCOPG2 = False
+
+from ansible.module_utils.basic import AnsibleModule, missing_required_lib
 from ansible.module_utils.database import SQLParseError
-from ansible.module_utils.postgres import connect_to_db, postgres_common_argument_spec
+from ansible.module_utils.postgres import connect_to_db, get_pg_version, postgres_common_argument_spec
+from ansible.module_utils.six import iteritems
 from ansible.module_utils._text import to_native
 
-PG_REQ_VER = 90400
 
 # To allow to set value like 1mb instead of 1MB, etc:
 POSSIBLE_SIZE_UNITS = ("mb", "gb", "tb")
@@ -289,9 +290,14 @@ def main():
         supports_check_mode=True,
     )
 
+    if not HAS_PSYCOPG2:
+        module.fail_json(msg=missing_required_lib('psycopg2'))
+
     name = module.params["name"]
     value = module.params["value"]
     reset = module.params["reset"]
+    sslrootcert = module.params["ca_cert"]
+    session_role = module.params["session_role"]
 
     # Allow to pass values like 1mb instead of 1MB, etc:
     if value:
@@ -305,12 +311,38 @@ def main():
     if not value and not reset:
         module.fail_json(msg="%s: at least one of value or reset param must be specified" % name)
 
-    db_connection = connect_to_db(module, autocommit=True, warn_db_default=False)
-    cursor = db_connection.cursor(cursor_factory=DictCursor)
+    # To use defaults values, keyword arguments must be absent, so
+    # check which values are empty and don't include in the **kw
+    # dictionary
+    params_map = {
+        "login_host": "host",
+        "login_user": "user",
+        "login_password": "password",
+        "port": "port",
+        "db": "database",
+        "ssl_mode": "sslmode",
+        "ca_cert": "sslrootcert"
+    }
+    kw = dict((params_map[k], v) for (k, v) in iteritems(module.params)
+              if k in params_map and v != '' and v is not None)
+
+    # Store connection parameters for the final check:
+    con_params = deepcopy(kw)
+
+    # If a login_unix_socket is specified, incorporate it here.
+    is_localhost = "host" not in kw or kw["host"] is None or kw["host"] == "localhost"
+    if is_localhost and module.params["login_unix_socket"] != "":
+        kw["host"] = module.params["login_unix_socket"]
+
+    if psycopg2.__version__ < '2.4.3' and sslrootcert:
+        module.fail_json(msg='psycopg2 must be at least 2.4.3 '
+                             'in order to user the ca_cert parameter')
+
+    db_connection = connect_to_db(module, kw, autocommit=True)
+    cursor = db_connection.cursor(cursor_factory=psycopg2.extras.DictCursor)
 
-    kw = {}
     # Check server version (needs 9.4 or later):
-    ver = db_connection.server_version
+    ver = get_pg_version(cursor)
     if ver < PG_REQ_VER:
         module.warn("PostgreSQL is %s version but %s or later is required" % (ver, PG_REQ_VER))
         kw = dict(
@@ -324,6 +356,13 @@ def main():
         db_connection.close()
         module.exit_json(**kw)
 
+    # Switch role, if specified:
+    if session_role:
+        try:
+            cursor.execute('SET ROLE %s' % session_role)
+        except Exception as e:
+            module.fail_json(msg="Could not switch role: %s" % to_native(e))
+
     # Set default returned values:
     restart_required = False
     changed = False
@@ -398,8 +437,8 @@ def main():
 
     # Reconnect and recheck current value:
     if context in ('sighup', 'superuser-backend', 'backend', 'superuser', 'user'):
-        db_connection = connect_to_db(module, autocommit=True)
-        cursor = db_connection.cursor(cursor_factory=DictCursor)
+        db_connection = connect_to_db(module, con_params, autocommit=True)
+        cursor = db_connection.cursor(cursor_factory=psycopg2.extras.DictCursor)
 
         res = param_get(cursor, module, name)
         # f_ means 'final'