Implement connection service file functionality

asyncpg/connect_utils.py

@@ -7,6 +7,7 @@
 from __future__ import annotations
 
 import asyncio
+import configparser
 import collections
 from collections.abc import Callable
 import enum
@@ -87,6 +88,9 @@ class SSLNegotiation(compat.StrEnum):
  PGPASSFILE = '.pgpass'
 
 
+PG_SERVICEFILE = '.pg_service.conf'
+
+
 def _read_password_file(passfile: pathlib.Path) \
  -> typing.List[typing.Tuple[str, ...]]:
 
@@ -269,6 +273,7 @@ def _dot_postgresql_path(filename) -> typing.Optional[pathlib.Path]:
 
 def _parse_connect_dsn_and_args(*, dsn, host, port, user,
  password, passfile, database, ssl,
+ service, servicefile,
  direct_tls, server_settings,
  target_session_attrs, krbsrvname, gsslib):
  # `auth_hosts` is the version of host information for the purposes
@@ -281,6 +286,32 @@ def _parse_connect_dsn_and_args(*, dsn, host, port, user,
  if dsn:
  parsed = urllib.parse.urlparse(dsn)
 
+ query = None
+ if parsed.query:
+ query = urllib.parse.parse_qs(parsed.query, strict_parsing=True)
+ for key, val in query.items():
+ if isinstance(val, list):
+ query[key] = val[-1]
+
+ if 'service' in query:
+ val = query.pop('service')
+ if not service and val:
+ service = val
+
+ connection_service_file = servicefile
+
+ if connection_service_file is None:
+ connection_service_file = os.getenv('PGSERVICEFILE')
+
+ if connection_service_file is None:
+ homedir = compat.get_pg_home_directory()
+ if homedir:
+ connection_service_file = homedir / PG_SERVICEFILE
+ else:
+ connection_service_file = None
+ else:
+ connection_service_file = pathlib.Path(connection_service_file)
+
  if parsed.scheme not in {'postgresql', 'postgres'}:
  raise exceptions.ClientConfigurationError(
  'invalid DSN: scheme is expected to be either '
@@ -315,11 +346,7 @@ def _parse_connect_dsn_and_args(*, dsn, host, port, user,
  if password is None and dsn_password:
  password = urllib.parse.unquote(dsn_password)
 
- if parsed.query:
- query = urllib.parse.parse_qs(parsed.query, strict_parsing=True)
- for key, val in query.items():
- if isinstance(val, list):
- query[key] = val[-1]
+ if query:
 
  if 'port' in query:
  val = query.pop('port')
@@ -406,12 +433,124 @@ def _parse_connect_dsn_and_args(*, dsn, host, port, user,
  if gsslib is None:
  gsslib = val
 
+ if 'service' in query:
+ val = query.pop('service')
+ if service is None:
+ service = val
+
  if query:
  if server_settings is None:
  server_settings = query
  else:
  server_settings = {**query, **server_settings}
 
+ if connection_service_file is not None and service is not None:
+ pg_service = configparser.ConfigParser()
+ pg_service.read(connection_service_file)
+ if service in pg_service.sections():
+ service_params = pg_service[service]
+ if 'port' in service_params:
+ val = service_params.pop('port')
+ if not port and val:
+ port = [int(p) for p in val.split(',')]
+
+ if 'host' in service_params:
+ val = service_params.pop('host')
+ if not host and val:
+ host, port = _parse_hostlist(val, port)
+
+ if 'dbname' in service_params:
+ val = service_params.pop('dbname')
+ if database is None:
+ database = val
+
+ if 'database' in service_params:
+ val = service_params.pop('database')
+ if database is None:
+ database = val
+
+ if 'user' in service_params:
+ val = service_params.pop('user')
+ if user is None:
+ user = val
+
+ if 'password' in service_params:
+ val = service_params.pop('password')
+ if password is None:
+ password = val
+
+ if 'passfile' in service_params:
+ val = service_params.pop('passfile')
+ if passfile is None:
+ passfile = val
+
+ if 'sslmode' in service_params:
+ val = service_params.pop('sslmode')
+ if ssl is None:
+ ssl = val
+
+ if 'sslcert' in service_params:
+ val = service_params.pop('sslcert')
+ if sslcert is None:
+ sslcert = val
+
+ if 'sslkey' in service_params:
+ val = service_params.pop('sslkey')
+ if sslkey is None:
+ sslkey = val
+
+ if 'sslrootcert' in service_params:
+ val = service_params.pop('sslrootcert')
+ if sslrootcert is None:
+ sslrootcert = val
+
+ if 'sslnegotiation' in service_params:
+ val = service_params.pop('sslnegotiation')
+ if sslnegotiation is None:
+ sslnegotiation = val
+
+ if 'sslcrl' in service_params:
+ val = service_params.pop('sslcrl')
+ if sslcrl is None:
+ sslcrl = val
+
+ if 'sslpassword' in service_params:
+ val = service_params.pop('sslpassword')
+ if sslpassword is None:
+ sslpassword = val
+
+ if 'ssl_min_protocol_version' in service_params:
+ val = service_params.pop(
+ 'ssl_min_protocol_version'
+ )
+ if ssl_min_protocol_version is None:
+ ssl_min_protocol_version = val
+
+ if 'ssl_max_protocol_version' in service_params:
+ val = service_params.pop(
+ 'ssl_max_protocol_version'
+ )
+ if ssl_max_protocol_version is None:
+ ssl_max_protocol_version = val
+
+ if 'target_session_attrs' in service_params:
+ dsn_target_session_attrs = service_params.pop(
+ 'target_session_attrs'
+ )
+ if target_session_attrs is None:
+ target_session_attrs = dsn_target_session_attrs
+
+ if 'krbsrvname' in service_params:
+ val = service_params.pop('krbsrvname')
+ if krbsrvname is None:
+ krbsrvname = val
+
+ if 'gsslib' in service_params:
+ val = service_params.pop('gsslib')
+ if gsslib is None:
+ gsslib = val
+ if not service:
+ service = os.environ.get('PGSERVICE')
  if not host:
  hostspec = os.environ.get('PGHOST')
  if hostspec:
@@ -724,7 +863,8 @@ def _parse_connect_arguments(*, dsn, host, port, user, password, passfile,
  max_cached_statement_lifetime,
  max_cacheable_statement_size,
  ssl, direct_tls, server_settings,
- target_session_attrs, krbsrvname, gsslib):
+ target_session_attrs, krbsrvname, gsslib,
+ service, servicefile):
  local_vars = locals()
  for var_name in {'max_cacheable_statement_size',
  'max_cached_statement_lifetime',
@@ -754,7 +894,8 @@ def _parse_connect_arguments(*, dsn, host, port, user, password, passfile,
  direct_tls=direct_tls, database=database,
  server_settings=server_settings,
  target_session_attrs=target_session_attrs,
- krbsrvname=krbsrvname, gsslib=gsslib)
+ krbsrvname=krbsrvname, gsslib=gsslib,
+ service=service, servicefile=servicefile)
 
  config = _ClientConfiguration(
  command_timeout=command_timeout,

asyncpg/connection.py

@@ -2074,6 +2074,8 @@ async def _do_execute(
 async def connect(dsn=None, *,
  host=None, port=None,
  user=None, password=None, passfile=None,
+ service=None,
+ servicefile=None,
  database=None,
  loop=None,
  timeout=60,
@@ -2183,6 +2185,14 @@ async def connect(dsn=None, *,
  (defaults to ``~/.pgpass``, or ``%APPDATA%\postgresql\pgpass.conf``
  on Windows).
 
+ :param service:
+ The name of the postgres connection service stored in the postgres
+ connection service file.
+
+ :param servicefile:
+ The location of the connnection service file used to store
+ connection parameters.
+
  :param loop:
  An asyncio event loop instance. If ``None``, the default
  event loop will be used.
@@ -2395,6 +2405,9 @@ async def connect(dsn=None, *,
  .. versionchanged:: 0.30.0
  Added the *krbsrvname* and *gsslib* parameters.
 
+ .. versionchanged:: 0.31.0
+ Added the *servicefile* and *service* parameters.
+
  .. _SSLContext: https://docs.python.org/3/library/ssl.html#ssl.SSLContext
  .. _create_default_context:
  https://docs.python.org/3/library/ssl.html#ssl.create_default_context
@@ -2428,6 +2441,8 @@ async def connect(dsn=None, *,
  user=user,
  password=password,
  passfile=passfile,
+ service=service,
+ servicefile=servicefile,
  ssl=ssl,
  direct_tls=direct_tls,
  database=database,