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

This reverts commit 2250257809.

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

@@ -71,16 +71,16 @@ server_version:
   sample: { major: 10, minor: 1 }
 '''
 
+
 try:
-    from psycopg2.extras import DictCursor
+    import psycopg2
+    HAS_PSYCOPG2 = True
 except ImportError:
-    # psycopg2 is checked by connect_to_db()
-    # from ansible.module_utils.postgres
-    pass
+    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 postgres_common_argument_spec
 from ansible.module_utils._text import to_native
 from ansible.module_utils.six import iteritems
 
@@ -118,8 +118,11 @@ class PgPing(object):
             res = self.cursor.fetchall()
             if res:
                 return res
+        except SQLParseError as e:
+            self.module.fail_json(msg=to_native(e))
+            self.cursor.close()
         except Exception as e:
-            self.module.fail_json("Unable to execute '%s': %s" % (query, to_native(e)))
+            self.module.warn("PostgreSQL server is unavailable: %s" % to_native(e))
 
         return False
 
@@ -138,6 +141,35 @@ def main():
         supports_check_mode=True,
     )
 
+    if not HAS_PSYCOPG2:
+        module.fail_json(msg=missing_required_lib('psycopg2'))
+
+    sslrootcert = module.params["ca_cert"]
+
+    # 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)
+
+    # 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 is not None:
+        module.fail_json(msg='psycopg2 must be at least 2.4.3 in order '
+                             'to user the ca_cert parameter')
+
     # Set some default values:
     cursor = False
     db_connection = False
@@ -147,10 +179,16 @@ def main():
         server_version=dict(),
     )
 
-    db_connection = connect_to_db(module, fail_on_conn=False)
-
-    if db_connection is not None:
-        cursor = db_connection.cursor(cursor_factory=DictCursor)
+    try:
+        db_connection = psycopg2.connect(**kw)
+        cursor = db_connection.cursor(cursor_factory=psycopg2.extras.DictCursor)
+    except TypeError as e:
+        if 'sslrootcert' in e.args[0]:
+            module.fail_json(msg='Postgresql server must be at least '
+                                 'version 8.4 to support sslrootcert')
+        module.fail_json(msg="unable to connect to database: %s" % to_native(e))
+    except Exception as e:
+        module.warn("PostgreSQL server is unavailable: %s" % to_native(e))
 
     # Do job:
     pg_ping = PgPing(module, cursor)