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asynmsg.py
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1039 lines (780 loc) · 30.1 KB
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# -*- coding: utf8 -*-
import os
import sys
import socket
import errno
import time
import struct
import logging
import asyncore
PY2 = sys.version_info[0] == 2
PY3 = sys.version_info[0] == 3
if PY3:
BinaryType = bytearray
elif PY2:
BinaryType = str
else:
raise RuntimeError('Unsupported python version.')
try:
import cPickle as pickle
except ImportError:
import pickle
__version__ = '0.2.4'
__all__ = [
"Error",
"SessionS", "SessionC",
"Server", "Client", "ClientInfinite",
"run_once", "run_forever",
"Sleep",
"logger",
"AsynMsgException", "MessageSizeOverflowError",
"with_message_handler_config", "message_handler_config",
"SessionKeepAliveParams",
"MessagePacker", "MessagePacker_Pickle", "MessagePacker_Struct",
]
def _str_system_error(code):
return '%d:%s' % (code, errno.errorcode.get(code, 'unknown'))
def _connect_with_timeout(sock, address, timeout):
sock.setblocking(False)
end_time = time.time() + timeout
while True:
time.sleep(0.001)
code = sock.connect_ex(address)
if code in (errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK) \
or (code == errno.WSAEINVAL and os.name in ('nt', 'ce')):
if end_time < time.time():
return 1, None # timeout
else:
continue
if code in (0, errno.EISCONN):
return 0, None # connected
else:
return -1, code # error
def _is_valid_message_format(msg):
if not isinstance(msg, tuple):
return False
if len(msg) != 2:
return False
if msg[0] is None:
return False
return True
def _wrapper_asyncore_log(msg, type):
if type == "info":
logger.info(msg)
elif type == "warning":
logger.warn(msg)
elif type == "error":
logger.error(msg)
else:
raise NotImplementedError
logger = logging.getLogger("asynmsg")
class Sleep:
def __init__(self, seconds):
self.seconds = seconds
def __call__(self, *args, **kwargs):
time.sleep(self.seconds)
_runner_list = []
def _run_once(runner_list, extra_tick, use_poll):
"""
:return True - success; False - extra_tick failure; runner object - the runner who tick failure
"""
if len(runner_list) > 0:
asyncore.loop(0, use_poll, None, 1)
for runner in runner_list:
if not runner.tick():
return runner
if extra_tick is not None:
code = extra_tick()
if code is False:
return False
return True
def run_once(runner_list=None, extra_tick=Sleep(0.001), use_poll=False, auto_stop=True):
"""
:param auto_stop when tick error occur, stop all runners, except:
if error was from a runner tick and the runner has set 'only_stop_self_when_tick_error' to True,
then only this runner stop
"""
if runner_list is None:
runner_list = _runner_list
code = _run_once(runner_list, extra_tick, use_poll)
if code is True: # no error
return True
elif code is False: # extra tick error
if auto_stop:
for runner in list(runner_list):
runner.stop()
return False
else: # runner tick error
if hasattr(code, 'only_stop_self_when_tick_error') and code.only_stop_self_when_tick_error:
if auto_stop:
code.stop()
return True
else:
if auto_stop:
for runner in list(runner_list):
runner.stop()
return False
return True
def run_forever(runner_list=None, extra_tick=Sleep(0.001), use_poll=False, auto_stop=True):
if runner_list is None:
runner_list = _runner_list
while True:
if not run_once(runner_list, extra_tick, use_poll, auto_stop):
break
class Error:
ERROR_OK = 0
ERROR_SELECT = -1
ERROR_REMOTE_CLOSED = -2
ERROR_FORCE_CLOSE = -3
ERROR_KEEP_ALIVE_TIMEOUT = -4
ERROR_UNPACK_INVALID_MESSAGE_SIZE = -5
ERROR_UNPACK_DECODE_MESSAGE = -6
ERROR_RECV_MESSAGE_FORMAT = -7
ERROR_HANDLE_MESSAGE = -8
ERROR_CONNECT_SYSTEM = -9
ERROR_CONNECT_TIMEOUT = -10
ERROR_CONNECT_OPEN = -11
ERROR_CONNECT_REFUSED = -12
BASE_STR_ERROR_MAP = {
ERROR_OK: 'ERROR_OK',
ERROR_SELECT: 'ERROR_SELECT',
ERROR_REMOTE_CLOSED: 'ERROR_REMOTE_CLOSED',
ERROR_FORCE_CLOSE: 'ERROR_FORCE_CLOSE',
ERROR_KEEP_ALIVE_TIMEOUT: 'ERROR_KEEP_ALIVE_TIMEOUT',
ERROR_UNPACK_INVALID_MESSAGE_SIZE: 'ERROR_UNPACK_INVALID_MESSAGE_SIZE',
ERROR_UNPACK_DECODE_MESSAGE: 'ERROR_UNPACK_DECODE_MESSAGE',
ERROR_RECV_MESSAGE_FORMAT: 'ERROR_RECV_MESSAGE_FORMAT',
ERROR_HANDLE_MESSAGE: 'ERROR_HANDLE_MESSAGE',
ERROR_CONNECT_SYSTEM: 'ERROR_CONNECT_SYSTEM',
ERROR_CONNECT_TIMEOUT: 'ERROR_CONNECT_TIMEOUT',
ERROR_CONNECT_OPEN: 'ERROR_CONNECT_OPEN',
ERROR_CONNECT_REFUSED: 'ERROR_CONNECT_REFUSED',
}
@staticmethod
def str_error(code):
return '%d:%s' % (code, Error.BASE_STR_ERROR_MAP.get(code, 'unknown'))
def __init__(self):
self._error = Error.ERROR_OK
self._system_error = 0
def __str__(self):
s = Error.str_error(self.get_error())
if self.has_system_error():
s += ':'
s += _str_system_error(self.get_system_error())
return s
def copy(self, other):
self._error = other._error
self._system_error = other._system_error
def clear(self):
self._error = Error.ERROR_OK
self._system_error = 0
def set_error(self, error, system_error=0):
if self.has_error():
return
self._error = error
self._system_error = system_error
def get_error(self):
return self._error
def has_error(self):
return self._error != Error.ERROR_OK
def get_system_error(self):
return self._system_error
def has_system_error(self):
return self._system_error != 0
class AsynMsgException(Exception):
pass
class MessageSizeOverflowError(AsynMsgException):
def __init__(self, msg_id, size, max_size):
self.msg_id = msg_id
self.size = size
self.max_size = max_size
def __str__(self):
return 'MessageSizeOverflowError: msg_id=%s size=%d max_size=%d' % (self.msg_id, self.size, self.max_size)
class SessionKeepAliveParams:
def __init__(self, idle_time=30, interval=10, probes=3, ping_id='keep_alive_ping', pong_id='keep_alive_pong'):
self.idle_time = idle_time
self.interval = interval
self.probes = probes
self.ping_id = ping_id
self.pong_id = pong_id
class MessagePacker:
def __init__(self, size_fmt='H'):
self._size_fmt = size_fmt
def pack(self, msg_id, msg_data):
""" Pack to bytes, msg_data may be any type(including None)"""
raise NotImplementedError
def unpack(self, bytes):
"""Unpack to pair of (msg_id, msg_data)"""
raise NotImplementedError
@property
def size_fmt(self):
return self._size_fmt
class MessagePacker_Pickle(MessagePacker):
def __init__(self, size_fmt='H'):
super(MessagePacker_Pickle, self).__init__(size_fmt)
def pack(self, msg_id, msg_data):
return pickle.dumps((msg_id, msg_data))
def unpack(self, bytes):
return pickle.loads(bytes)
class MessagePacker_Struct(MessagePacker):
def __init__(self, size_fmt='H', id_fmt='H'):
super(MessagePacker_Struct, self).__init__(size_fmt)
self._id_fmt = id_fmt
def pack(self, msg_id, msg_data):
bytes = struct.pack(self._id_fmt, msg_id)
if msg_data is not None:
bytes += msg_data
return bytes
def unpack(self, bytes):
msg_id = struct.unpack_from(self._id_fmt, bytes)[0]
msg_data = bytes[2:]
return (msg_id, msg_data)
def with_message_handler_config(cls):
# cls hasattr _command_factory if derived from a class which defined with_message_handler_config
if not hasattr(cls, '_command_factory'):
cls._command_factory = {}
if cls.keep_alive_params is not None:
def _on_keep_alive_ping(self, msg_id, msg_data):
self.send_message(cls.keep_alive_params.pong_id, None)
def _on_keep_alive_pong(self, msg_id, msg_data):
pass
cls.register_command_handler(cls.keep_alive_params.ping_id, _on_keep_alive_ping)
cls.register_command_handler(cls.keep_alive_params.pong_id, _on_keep_alive_pong)
order_map = {}
for func in cls.__dict__.values():
if hasattr(func,'_message_handler_index'):
order_map[func._message_handler_index] = func
# keys can't sort in python 3(the type is dict_keys)
# so we first transform it to a list
keys = order_map.keys()
sort_keys = list(keys)
sort_keys.sort()
for k in sort_keys:
func = order_map[k]
cls.register_command_handler(func._message_handler_msg_id, func)
return cls
class message_handler_config:
total_count = 0
def __init__(self, msg_id, allow_override=True):
self.msg_id = msg_id
self.allow_override = allow_override
self.index = self.__class__.total_count
self.__class__.total_count += 1
def __call__(self, func):
func._message_handler_index = self.index
func._message_handler_msg_id = self.msg_id
func._message_handler_allow_override = self.allow_override
return func
class AsynMsgDispatcher(asyncore.dispatcher):
def close(self):
asyncore.dispatcher.close(self)
self.socket = None
class _Session(AsynMsgDispatcher):
message_packer = MessagePacker_Pickle()
keep_alive_params = SessionKeepAliveParams() # set None to disable
max_message_size = 16 * 1024
max_send_size_once = 16 * 1024
max_recv_size_once = 16 * 1024
enable_nagle_algorithm = False
@classmethod
def register_command_handler(cls, cmd, handler):
if cmd in cls._command_factory:
old_handler = cls._command_factory[cmd]
if hasattr(old_handler,'_message_handler_allow_override') and old_handler._message_handler_allow_override:
cls._command_factory[cmd] = handler
else:
raise RuntimeError("Can't register message handler with duplicate id '%s'." % cmd)
cls._command_factory[cmd] = handler
def __init__(self, sock, address):
AsynMsgDispatcher.__init__(self, sock)
self._manage_owner = None
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, not self.__class__.enable_nagle_algorithm)
self._error = Error()
self._in_buffer = BinaryType()
self._out_buffer = BinaryType()
self._last_read_time = time.time()
self._keep_alive_probe_count = 0
self._force_close_time = -1
self._force_wait_timeout = False
self._ready = True
self._serial = -1
def close(self):
AsynMsgDispatcher.close(self)
# close on no data to send or timeout, like linger
# if force_wait_timeout is True, wait even if no data to send
def force_close(self, timeout=5, force_wait_timeout=False):
self._force_close_time = time.time() + timeout
self._force_wait_timeout = force_wait_timeout
def get_manage_owner(self):
return self._manage_owner
def set_ready(self, ready=True):
self._ready = ready
def is_ready(self):
return self._ready
def get_error(self):
return self._error
def get_local_address(self):
return self.socket.getsockname()
def get_remote_address(self):
return self.addr
def get_serial(self):
return self._serial
def get_low_level_desc(self):
local_addr = self.get_local_address()
remote_addr = self.get_remote_address()
return '%s(%s:%d,%s:%d)(%d)' % (self.__class__.__name__, local_addr[0], local_addr[1], remote_addr[0], remote_addr[1], self._serial)
def check_open(self):
return True
def on_opened(self):
pass
def on_closing(self):
pass
def on_closed(self):
pass
def tick(self):
if not self._error.has_error():
if self._force_close_time > 0:
if (not self._force_wait_timeout and len(self._out_buffer) == 0) or self._force_close_time < time.time():
self._error.set_error(Error.ERROR_FORCE_CLOSE)
if not self._error.has_error():
self._keep_alive_check()
if not self._error.has_error():
self._unpack_and_handle_messages()
return not self._error.has_error()
""" <<< asyncore.dispatcher interfaces """
def log(self, message):
_wrapper_asyncore_log(message, 'info')
def log_info(self, message, type='info'):
_wrapper_asyncore_log(message, type)
def readable(self):
return not self._error.has_error()
def writable(self):
return (not self._error.has_error()) and len(self._out_buffer) > 0
def handle_read(self):
if self._error.has_error():
return
data = self.recv(self.__class__.max_recv_size_once) # may handle_close inside
if data:
self._in_buffer += data
self._last_read_time = time.time()
self._keep_alive_probe_count = 0
def handle_write(self):
if self._error.has_error():
return
num = self.send(self._out_buffer[:self.__class__.max_send_size_once])
if num > 0:
self._out_buffer = self._out_buffer[num:]
def handle_close(self): # use set_error if want to close manually
if self._error.has_error():
return
self._error.set_error(Error.ERROR_REMOTE_CLOSED)
""" asyncore.dispatcher interfaces >>> """
def handle_message(self, msg_id, msg_data):
handler = self.__class__._command_factory.get(msg_id)
if handler is None:
return self.on_unhandled_message(msg_id, msg_data)
else:
return handler(self, msg_id, msg_data)
def on_unhandled_message(self, msg_id, msg_data):
logger.warning('%s unhandled message(%s)', self.get_low_level_desc(), msg_id)
def send_message(self, msg_id, msg_data):
"""msg_data can be None"""
if self._error.has_error() or self._force_close_time > 0:
return False
byte_msg = self.message_packer.pack(msg_id, msg_data)
length = struct.calcsize(self.__class__.message_packer.size_fmt) + len(byte_msg)
if length > self.__class__.max_message_size:
raise MessageSizeOverflowError(msg_id, length, self.__class__.max_message_size)
self._out_buffer += struct.pack(self.__class__.message_packer.size_fmt, length)
self._out_buffer += byte_msg
return True
def _unpack_and_handle_messages(self):
while True:
pair = self._unpack_message()
if pair in (0, -1):
break
if not _is_valid_message_format(pair):
try:
logger.error('%s invalid message format: %s', self.get_low_level_desc(), str(pair))
except:
pass
self._error.set_error(Error.ERROR_RECV_MESSAGE_FORMAT)
break
code = self.handle_message(pair[0], pair[1])
if code is False and not self._error.has_error():
logger.error('%s handle message(%s) error', self.get_low_level_desc(), pair[0])
self._error.set_error(Error.ERROR_HANDLE_MESSAGE)
if self._error.has_error():
break
# 0: retry
# -1: error
def _unpack_message(self):
size_length = struct.calcsize(self.__class__.message_packer.size_fmt)
buff_length = len(self._in_buffer)
if buff_length < size_length:
return 0
length = struct.unpack_from(self.__class__.message_packer.size_fmt, self._in_buffer)[0]
if length < size_length or length > self.__class__.max_message_size:
logger.error('%s invalid message size(%d), must between [%d~%d]', self.get_low_level_desc(), length, size_length, self.__class__.max_message_size)
self._error.set_error(Error.ERROR_UNPACK_INVALID_MESSAGE_SIZE)
return -1
if buff_length < length:
return 0
byte_msg = self._in_buffer[size_length:length]
try:
pair = self.message_packer.unpack(byte_msg)
except:
self._error.set_error(Error.ERROR_UNPACK_DECODE_MESSAGE)
return -1
self._in_buffer = self._in_buffer[length:]
return pair
def _keep_alive_check(self):
if self.__class__.keep_alive_params is None:
return
if self._keep_alive_probe_count > self.__class__.keep_alive_params.probes:
return
check_time = self.__class__.keep_alive_params.idle_time + \
self._keep_alive_probe_count * self.__class__.keep_alive_params.interval
if time.time() - self._last_read_time > check_time:
self._keep_alive_probe_count += 1
if self._keep_alive_probe_count > self.__class__.keep_alive_params.probes:
self._error.set_error(Error.ERROR_KEEP_ALIVE_TIMEOUT)
else:
self.send_message(self.__class__.keep_alive_params.ping_id, None)
def _on_keep_alive_ping(self, msg_id, msg_data):
self.send_message(self.__class__.keep_alive_params.pong_id, None)
class SessionS(_Session):
def __init__(self, sock, address):
_Session.__init__(self, sock, address)
def on_opened(self):
logger.info('%s open' % (self.get_low_level_desc()))
def on_closing(self):
logger.info('%s close, error(%s)' % (self.get_low_level_desc(), self._error))
class Server(AsynMsgDispatcher):
session_class = SessionS
only_stop_self_when_tick_error = False
def __init__(self):
AsynMsgDispatcher.__init__(self)
self._session_map = {}
self._next_serial = 0
self._error = Error()
self._listen_address = ''
def set_listen_address(self, address):
self._listen_address = address
def start(self):
assert not self.is_started()
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.set_reuse_addr()
self.bind(self._listen_address)
self.listen(5)
_runner_list.append(self)
self.log_info('%s(%s:%d) start listening...' % (self.__class__.__name__, self._listen_address[0], self._listen_address[1]))
def stop(self):
if not self.is_started():
return
self.log_info('%s(%s:%d) stop listening' % (self.__class__.__name__, self._listen_address[0], self._listen_address[1]))
_runner_list.remove(self)
self._clear_sessions()
self._error.clear()
self.close()
def tick(self):
assert self.is_started()
if self._error.has_error(): # by dispatcher
return False
for session in list(self._session_map.values()): # make a list copy in case: session remove from map by _close_session
if session.get_error().has_error():
self._close_session(session)
for session in self._session_map.values():
session.tick()
return True
def is_started(self):
return self.socket is not None
""" <<< asyncore.dispatcher interfaces """
def log(self, message):
_wrapper_asyncore_log(message, 'info')
def log_info(self, message, type='info'):
_wrapper_asyncore_log(message, type)
def handle_accepted(self, sock, address):
self._open_session(sock, address)
def handle_close(self):
self._error.set_error(Error.ERROR_SELECT)
""" asyncore.dispatcher interfaces >>> """
def get_error(self):
return self._error
def find_session(self, serial):
return self._session_map.get(serial)
def get_sessions(self):
result = []
for session in self._session_map.values():
result.append(session)
return result
def get_ready_sessions(self):
result = []
for session in self._session_map.values():
if session.is_ready():
result.append(session)
return result
def broadcast(self, msg_id, msg_data=None):
for session in self._session_map.values():
if session.is_ready():
session.send_message(msg_id, msg_data)
def check_session_open(self, session):
return session.check_open()
def on_session_opened(self, session):
session.on_opened()
def on_session_closing(self, session):
session.on_closing()
def on_session_closed(self, session):
session.on_closed()
def _clear_sessions(self):
for session in list(self._session_map.values()):
self._close_session(session)
assert len(self._session_map) == 0 #self._session_map.clear()
def _open_session(self, sock, address):
session = self.__class__.session_class(sock, address)
if not self.check_session_open(session):
session.close()
return False
#{ build link
session._manage_owner = self
session._serial = self._next_serial
self._next_serial += 1
self._session_map[session.get_serial()] = session
#}
self.on_session_opened(session)
return True
def _close_session(self, session):
self.on_session_closing(session)
#{ break link
del self._session_map[session.get_serial()]
session._manage_owner = None
#}
session.close()
self.on_session_closed(session)
class SessionC(_Session):
def __init__(self, sock, address):
_Session.__init__(self, sock, address)
def on_opened(self):
logger.info('%s connected' % (self.get_low_level_desc()))
def on_closing(self):
logger.info('%s disconnect, error(%s)' % (self.get_low_level_desc(), self._error))
class Client:
session_class = SessionC
only_stop_self_when_tick_error = False
def __init__(self):
self._started = False
self._session = None
self._next_serial = 0
self._error = Error()
self._connect_address = None
self._connect_timeout = 5
def set_connect_address(self, address):
self._connect_address = address
def set_connect_timeout(self, timeout):
self._connect_timeout = timeout
def _do_connect(self):
sock = socket.socket()
code, err = _connect_with_timeout(sock, self._connect_address, self._connect_timeout)
if code == -1: # error
self._error.set_error(Error.ERROR_CONNECT_SYSTEM, err)
sock.close()
return False
if code == 1: # timeout
self._error.set_error(Error.ERROR_CONNECT_TIMEOUT)
sock.close()
return False
if not self._open_session(sock, self._connect_address):
self._error.set_error(Error.ERROR_CONNECT_OPEN)
return False
return True
def start(self):
assert not self.is_started()
self.log_info('%s(%s:%d) start connecting...' % (self.__class__.__name__, self._connect_address[0], self._connect_address[1]))
if not self._do_connect():
self.log_info('%s(%s:%d) connect failure(%s)' % (self.__class__.__name__, self._connect_address[0], self._connect_address[1], self._error))
return False
_runner_list.append(self)
self._started = True
return True
def stop(self):
if not self.is_started():
return
_runner_list.remove(self)
self._close_session()
self._error.clear()
self._started = False
def tick(self):
assert self.is_started()
if self._error.has_error():
return False
if self._session.get_error().has_error():
self._error.copy(self._session.get_error())
return False
self._session.tick()
return True
def is_started(self):
return self._started
def get_error(self):
return self._error
def get_session(self):
return self._session
def get_ready_session(self):
return self._session if (self._session is not None and self._session.is_ready()) else None
def check_session_open(self, session):
return session.check_open()
def on_session_opened(self, session):
session.on_opened()
def on_session_closing(self, session):
session.on_closing()
def on_session_closed(self, session):
session.on_closed()
def _open_session(self, sock, address):
session = self.__class__.session_class(sock, address)
if not self.check_session_open(session):
session.close()
return False
#{ build link
session._manage_owner = self
session._serial = self._next_serial
self._next_serial += 1
self._session = session
#}
self.on_session_opened(session)
return True
def _close_session(self):
session = self._session
self.on_session_closing(session)
#{ break link
self._session = None
session._manage_owner = None
#}
session.close()
self.on_session_closed(session)
def log(self, message):
_wrapper_asyncore_log(message, 'info')
def log_info(self, message, type='info'):
_wrapper_asyncore_log(message, type)
class ClientInfinite(AsynMsgDispatcher):
session_class = SessionC
only_stop_self_when_tick_error = False
def __init__(self):
AsynMsgDispatcher.__init__(self)
self._started = False
self._session = None
self._next_serial = 0
self._connect_address = None
self._wait_retry_interval = 10
self._connect_time = 0
def set_connect_address(self, address):
"""在start前若没有调用该方法,则在start后调用该方法时会立即发起连接"""
self._connect_address = address
def set_wait_retry_interval(self, interval):
self._wait_retry_interval = interval
def start(self):
assert not self.is_started()
self.do_wait_retry(0)
_runner_list.append(self)
self._started = True
return True
def stop(self):
if not self.is_started():
return
_runner_list.remove(self)
if self._session is None:
self.close()
else:
self._close_session()
self._started = False
def tick(self):
assert self.is_started()
if self._session is None:
if self.socket is None:
if self._connect_time < time.time():
if self._connect_address is not None:
self.log_info('%s(%s:%d) start connecting...' % (self.__class__.__name__, self._connect_address[0], self._connect_address[1]))
self.do_connect()
else:
pass # 等待发起下次连接
else:
pass # 正在连接
else:
pass # 已经连接
if self._session is not None:
if self._session.get_error().has_error():
self._close_session()
if self._session is not None:
self._session.tick()
return True
def wait_retry(self, interval=None):
if interval is None:
interval = self._wait_retry_interval
if self._connect_address is not None:
self.log_info('%s(%s:%d) try reconnect after %d seconds' % (self.__class__.__name__, self._connect_address[0], self._connect_address[1], interval))
self.do_wait_retry(interval)
def do_wait_retry(self, interval):
"""在interval秒后发起连接"""
self._connect_time = time.time() + interval
def do_connect(self):
"""发起连接"""
assert self.socket is None
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.connect(self._connect_address) # may handle_connect inside
def is_started(self):
return self._started
def get_session(self):
return self._session
def get_ready_session(self):
return self._session if (self._session is not None and self._session.is_ready()) else None
def check_session_open(self, session):
return session.check_open()
def on_session_opened(self, session):
session.on_opened()
def on_session_closing(self, session):
session.on_closing()
def on_session_closed(self, session):
session.on_closed()
self.wait_retry()
def _open_session(self, sock, address):
session = self.__class__.session_class(sock, address)
if not self.check_session_open(session):
session.close()
return False
#{ build link
session._manage_owner = self
session._serial = self._next_serial
self._next_serial += 1
self._session = session
#}
self.on_session_opened(session)
return True