/
core.py
891 lines (757 loc) · 30.8 KB
/
core.py
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import asyncio
import asyncio.events
import errno
import struct
import sys
import threading
import weakref
import zmq
from collections import deque, namedtuple
from collections.abc import Iterable
from .interface import ZmqTransport, ZmqProtocol
from .log import logger
from .selector import ZmqSelector
from .util import _EndpointsSet
if sys.platform == 'win32':
from asyncio.windows_events import SelectorEventLoop
else:
from asyncio.unix_events import SelectorEventLoop, SafeChildWatcher
__all__ = ['ZmqEventLoop', 'ZmqEventLoopPolicy', 'create_zmq_connection']
SocketEvent = namedtuple('SocketEvent', 'event value endpoint')
@asyncio.coroutine
def create_zmq_connection(protocol_factory, zmq_type, *,
bind=None, connect=None, zmq_sock=None, loop=None):
"""A coroutine which creates a ZeroMQ connection endpoint.
The return value is a pair of (transport, protocol),
where transport support ZmqTransport interface.
protocol_factory should instantiate object with ZmqProtocol interface.
zmq_type is type of ZeroMQ socket (zmq.REQ, zmq.REP, zmq.PUB, zmq.SUB,
zmq.PAIR, zmq.DEALER, zmq.ROUTER, zmq.PULL, zmq.PUSH, etc.)
bind is string or iterable of strings that specifies enpoints.
Every endpoint creates ending for acceptin connections
and binds it to the transport.
Other side should use connect parameter to connect to this transport.
See http://api.zeromq.org/master:zmq-bind for details.
connect is string or iterable of strings that specifies enpoints.
Every endpoint connects transport to specified transport.
Other side should use bind parameter to wait for incoming connections.
See http://api.zeromq.org/master:zmq-connect for details.
endpoint is a string consisting of two parts as follows:
transport://address.
The transport part specifies the underlying transport protocol to use.
The meaning of the address part is specific to the underlying
transport protocol selected.
The following transports are defined:
inproc - local in-process (inter-thread) communication transport,
see http://api.zeromq.org/master:zmq-inproc.
ipc - local inter-process communication transport,
see http://api.zeromq.org/master:zmq-ipc
tcp - unicast transport using TCP,
see http://api.zeromq.org/master:zmq_tcp
pgm, epgm - reliable multicast transport using PGM,
see http://api.zeromq.org/master:zmq_pgm
zmq_sock is a zmq.Socket instance to use preexisting object
with created transport.
"""
if loop is None:
loop = asyncio.get_event_loop()
if isinstance(loop, ZmqEventLoop):
ret = yield from loop.create_zmq_connection(protocol_factory,
zmq_type,
bind=bind,
connect=connect,
zmq_sock=zmq_sock)
return ret
try:
if zmq_sock is None:
zmq_sock = zmq.Context.instance().socket(zmq_type)
elif zmq_sock.getsockopt(zmq.TYPE) != zmq_type:
raise ValueError('Invalid zmq_sock type')
except zmq.ZMQError as exc:
raise OSError(exc.errno, exc.strerror) from exc
protocol = protocol_factory()
waiter = asyncio.Future(loop=loop)
transport = _ZmqLooplessTransportImpl(loop, zmq_type,
zmq_sock, protocol, waiter)
yield from waiter
try:
if bind is not None:
if isinstance(bind, str):
bind = [bind]
else:
if not isinstance(bind, Iterable):
raise ValueError('bind should be str or iterable')
for endpoint in bind:
yield from transport.bind(endpoint)
if connect is not None:
if isinstance(connect, str):
connect = [connect]
else:
if not isinstance(connect, Iterable):
raise ValueError('connect should be '
'str or iterable')
for endpoint in connect:
yield from transport.connect(endpoint)
return transport, protocol
except OSError:
# don't care if zmq_sock.close can raise exception
# that should never happen
zmq_sock.close()
raise
class ZmqEventLoop(SelectorEventLoop):
"""ZeroMQ event loop.
Follows asyncio.AbstractEventLoop specification, in addition implements
create_zmq_connection method for working with ZeroMQ sockets.
"""
def __init__(self, *, zmq_context=None):
super().__init__(selector=ZmqSelector())
if zmq_context is None:
self._zmq_context = zmq.Context.instance()
else:
self._zmq_context = zmq_context
self._zmq_sockets = weakref.WeakSet()
def close(self):
for zmq_sock in self._zmq_sockets:
if not zmq_sock.closed:
zmq_sock.close()
super().close()
@asyncio.coroutine
def create_zmq_connection(self, protocol_factory, zmq_type, *,
bind=None, connect=None, zmq_sock=None):
"""A coroutine which creates a ZeroMQ connection endpoint.
See aiozmq.create_zmq_connection() coroutine for details.
"""
try:
if zmq_sock is None:
zmq_sock = self._zmq_context.socket(zmq_type)
elif zmq_sock.getsockopt(zmq.TYPE) != zmq_type:
raise ValueError('Invalid zmq_sock type')
except zmq.ZMQError as exc:
raise OSError(exc.errno, exc.strerror) from exc
protocol = protocol_factory()
waiter = asyncio.Future(loop=self)
transport = _ZmqTransportImpl(self, zmq_type,
zmq_sock, protocol, waiter)
yield from waiter
try:
if bind is not None:
if isinstance(bind, str):
bind = [bind]
else:
if not isinstance(bind, Iterable):
raise ValueError('bind should be str or iterable')
for endpoint in bind:
yield from transport.bind(endpoint)
if connect is not None:
if isinstance(connect, str):
connect = [connect]
else:
if not isinstance(connect, Iterable):
raise ValueError('connect should be '
'str or iterable')
for endpoint in connect:
yield from transport.connect(endpoint)
self._zmq_sockets.add(zmq_sock)
return transport, protocol
except OSError:
# don't care if zmq_sock.close can raise exception
# that should never happen
zmq_sock.close()
raise
class _ZmqEventProtocol(ZmqProtocol):
"""This protocol is used internally by aiozmq to receive messages
from a socket event monitor socket. This protocol decodes each event
message into a namedtuple and then passes them through to the
protocol running the socket that is being monitored via the
ZmqProtocol.event_received method.
This design simplifies the API visible to the developer at the cost
of adding some internal complexity - a hidden protocol that transfers
events from the monitor protocol to the monitored socket's protocol.
"""
def __init__(self, loop, main_protocol):
self._protocol = main_protocol
self.wait_ready = asyncio.Future(loop=loop)
self.wait_closed = asyncio.Future(loop=loop)
def connection_made(self, transport):
self.transport = transport
self.wait_ready.set_result(True)
def connection_lost(self, exc):
self.wait_closed.set_result(exc)
def msg_received(self, data):
if len(data) != 2 or len(data[0]) != 6:
raise RuntimeError(
"Invalid event message format: {}".format(data))
event, value = struct.unpack("=hi", data[0])
endpoint = data[1].decode()
self.event_received(SocketEvent(event, value, endpoint))
def event_received(self, evt):
self._protocol.event_received(evt)
class _BaseTransport(ZmqTransport):
LOG_THRESHOLD_FOR_CONNLOST_WRITES = 5
ZMQ_TYPES = {getattr(zmq, name): name
for name in ('PUB', 'SUB', 'REP', 'REQ',
'PUSH', 'PULL', 'DEALER', 'ROUTER',
'XPUB', 'XSUB', 'PAIR', 'STREAM')
if hasattr(zmq, name)}
def __init__(self, loop, zmq_type, zmq_sock, protocol):
super().__init__(None)
self._protocol_paused = False
self._set_write_buffer_limits()
self._extra['zmq_socket'] = zmq_sock
self._extra['zmq_type'] = zmq_type
self._loop = loop
self._zmq_sock = zmq_sock
self._zmq_type = zmq_type
self._protocol = protocol
self._closing = False
self._buffer = deque()
self._buffer_size = 0
self._bindings = set()
self._connections = set()
self._subscriptions = set()
self._paused = False
self._conn_lost = 0
self._monitor = None
def __repr__(self):
info = ['ZmqTransport',
'sock={}'.format(self._zmq_sock),
'type={}'.format(self.ZMQ_TYPES[self._zmq_type])]
try:
events = self._zmq_sock.getsockopt(zmq.EVENTS)
if events & zmq.POLLIN:
info.append('read=polling')
else:
info.append('read=idle')
if events & zmq.POLLOUT:
state = 'polling'
else:
state = 'idle'
bufsize = self.get_write_buffer_size()
info.append('write=<{}, bufsize={}>'.format(state, bufsize))
except zmq.ZMQError:
pass
return '<{}>'.format(' '.join(info))
def write(self, data):
if not data:
return
for part in data:
if not isinstance(part, (bytes, bytearray, memoryview)):
raise TypeError('data argument must be iterable of '
'byte-ish (%r)' % data)
data_len = sum(len(part) for part in data)
if self._conn_lost:
if self._conn_lost >= self.LOG_THRESHOLD_FOR_CONNLOST_WRITES:
logger.warning('write to closed ZMQ socket.')
self._conn_lost += 1
return
if not self._buffer:
try:
if self._do_send(data):
return
except Exception as exc:
self._fatal_error(exc,
'Fatal write error on zmq socket transport')
return
self._buffer.append((data_len, data))
self._buffer_size += data_len
self._maybe_pause_protocol()
def can_write_eof(self):
return False
def abort(self):
self._force_close(None)
def _fatal_error(self, exc, message='Fatal error on transport'):
# Should be called from exception handler only.
self._loop.call_exception_handler({
'message': message,
'exception': exc,
'transport': self,
'protocol': self._protocol,
})
self._force_close(exc)
def _call_connection_lost(self, exc):
try:
self._protocol.connection_lost(exc)
finally:
if not self._zmq_sock.closed:
self._zmq_sock.close()
self._zmq_sock = None
self._protocol = None
self._loop = None
def _maybe_pause_protocol(self):
size = self.get_write_buffer_size()
if size <= self._high_water:
return
if not self._protocol_paused:
self._protocol_paused = True
try:
self._protocol.pause_writing()
except Exception as exc:
self._loop.call_exception_handler({
'message': 'protocol.pause_writing() failed',
'exception': exc,
'transport': self,
'protocol': self._protocol,
})
def _maybe_resume_protocol(self):
if (self._protocol_paused and
self.get_write_buffer_size() <= self._low_water):
self._protocol_paused = False
try:
self._protocol.resume_writing()
except Exception as exc:
self._loop.call_exception_handler({
'message': 'protocol.resume_writing() failed',
'exception': exc,
'transport': self,
'protocol': self._protocol,
})
def _set_write_buffer_limits(self, high=None, low=None):
if high is None:
if low is None:
high = 64*1024
else:
high = 4*low
if low is None:
low = high // 4
if not high >= low >= 0:
raise ValueError('high (%r) must be >= low (%r) must be >= 0' %
(high, low))
self._high_water = high
self._low_water = low
def get_write_buffer_limits(self):
return (self._low_water, self._high_water)
def set_write_buffer_limits(self, high=None, low=None):
self._set_write_buffer_limits(high=high, low=low)
self._maybe_pause_protocol()
def pause_reading(self):
if self._closing:
raise RuntimeError('Cannot pause_reading() when closing')
if self._paused:
raise RuntimeError('Already paused')
self._paused = True
self._do_pause_reading()
def resume_reading(self):
if not self._paused:
raise RuntimeError('Not paused')
self._paused = False
if self._closing:
return
self._do_resume_reading()
def getsockopt(self, option):
while True:
try:
ret = self._zmq_sock.getsockopt(option)
if option == zmq.LAST_ENDPOINT:
ret = ret.decode('utf-8').rstrip('\x00')
return ret
except zmq.ZMQError as exc:
if exc.errno == errno.EINTR:
continue
raise OSError(exc.errno, exc.strerror) from exc
def setsockopt(self, option, value):
while True:
try:
self._zmq_sock.setsockopt(option, value)
if option == zmq.SUBSCRIBE:
self._subscriptions.add(value)
elif option == zmq.UNSUBSCRIBE:
self._subscriptions.discard(value)
return
except zmq.ZMQError as exc:
if exc.errno == errno.EINTR:
continue
raise OSError(exc.errno, exc.strerror) from exc
def get_write_buffer_size(self):
return self._buffer_size
def bind(self, endpoint):
fut = asyncio.Future(loop=self._loop)
try:
if not isinstance(endpoint, str):
raise TypeError('endpoint should be str, got {!r}'
.format(endpoint))
try:
self._zmq_sock.bind(endpoint)
real_endpoint = self.getsockopt(zmq.LAST_ENDPOINT)
except zmq.ZMQError as exc:
raise OSError(exc.errno, exc.strerror) from exc
except Exception as exc:
fut.set_exception(exc)
else:
self._bindings.add(real_endpoint)
fut.set_result(real_endpoint)
return fut
def unbind(self, endpoint):
fut = asyncio.Future(loop=self._loop)
try:
if not isinstance(endpoint, str):
raise TypeError('endpoint should be str, got {!r}'
.format(endpoint))
try:
self._zmq_sock.unbind(endpoint)
except zmq.ZMQError as exc:
raise OSError(exc.errno, exc.strerror) from exc
else:
self._bindings.discard(endpoint)
except Exception as exc:
fut.set_exception(exc)
else:
fut.set_result(None)
return fut
def bindings(self):
return _EndpointsSet(self._bindings)
def connect(self, endpoint):
fut = asyncio.Future(loop=self._loop)
try:
if not isinstance(endpoint, str):
raise TypeError('endpoint should be str, got {!r}'
.format(endpoint))
try:
self._zmq_sock.connect(endpoint)
except zmq.ZMQError as exc:
raise OSError(exc.errno, exc.strerror) from exc
except Exception as exc:
fut.set_exception(exc)
else:
self._connections.add(endpoint)
fut.set_result(endpoint)
return fut
def disconnect(self, endpoint):
fut = asyncio.Future(loop=self._loop)
try:
if not isinstance(endpoint, str):
raise TypeError('endpoint should be str, got {!r}'
.format(endpoint))
try:
self._zmq_sock.disconnect(endpoint)
except zmq.ZMQError as exc:
raise OSError(exc.errno, exc.strerror) from exc
except Exception as exc:
fut.set_exception(exc)
else:
self._connections.discard(endpoint)
fut.set_result(None)
return fut
def connections(self):
return _EndpointsSet(self._connections)
def subscribe(self, value):
if self._zmq_type != zmq.SUB:
raise NotImplementedError("Not supported ZMQ socket type")
if not isinstance(value, bytes):
raise TypeError("value argument should be bytes")
if value in self._subscriptions:
return
self.setsockopt(zmq.SUBSCRIBE, value)
def unsubscribe(self, value):
if self._zmq_type != zmq.SUB:
raise NotImplementedError("Not supported ZMQ socket type")
if not isinstance(value, bytes):
raise TypeError("value argument should be bytes")
self.setsockopt(zmq.UNSUBSCRIBE, value)
def subscriptions(self):
if self._zmq_type != zmq.SUB:
raise NotImplementedError("Not supported ZMQ socket type")
return _EndpointsSet(self._subscriptions)
@asyncio.coroutine
def enable_monitor(self, events=None):
# The standard approach of binding and then connecting does not
# work in this specific case. The event loop does not properly
# detect messages on the inproc transport which means that event
# messages get missed.
# pyzmq's 'get_monitor_socket' method can't be used because this
# performs the actions in the wrong order for use with an event
# loop.
# For more information on this issue see:
# http://lists.zeromq.org/pipermail/zeromq-dev/2015-July/029181.html
if (zmq.zmq_version_info() < (4,) or
zmq.pyzmq_version_info() < (14, 4,)):
raise NotImplementedError(
"Socket monitor requires libzmq >= 4 and pyzmq >= 14.4, "
"have libzmq:{}, pyzmq:{}".format(
zmq.zmq_version(), zmq.pyzmq_version()))
if self._monitor is None:
addr = "inproc://monitor.s-{}".format(self._zmq_sock.FD)
events = events or zmq.EVENT_ALL
_, self._monitor = yield from create_zmq_connection(
lambda: _ZmqEventProtocol(self._loop, self._protocol),
zmq.PAIR, connect=addr, loop=self._loop)
# bind must come after connect
self._zmq_sock.monitor(addr, events)
yield from self._monitor.wait_ready
@asyncio.coroutine
def disable_monitor(self):
self._disable_monitor()
def _disable_monitor(self):
if self._monitor:
self._zmq_sock.disable_monitor()
self._monitor.transport.close()
self._monitor = None
class _ZmqTransportImpl(_BaseTransport):
def __init__(self, loop, zmq_type, zmq_sock, protocol, waiter=None):
super().__init__(loop, zmq_type, zmq_sock, protocol)
self._loop.add_reader(self._zmq_sock, self._read_ready)
self._loop.call_soon(self._protocol.connection_made, self)
if waiter is not None:
self._loop.call_soon(waiter.set_result, None)
def _read_ready(self):
try:
try:
data = self._zmq_sock.recv_multipart(zmq.NOBLOCK)
except zmq.ZMQError as exc:
if exc.errno in (errno.EAGAIN, errno.EINTR):
return
else:
raise OSError(exc.errno, exc.strerror) from exc
except Exception as exc:
self._fatal_error(exc, 'Fatal read error on zmq socket transport')
else:
self._protocol.msg_received(data)
def _do_send(self, data):
try:
self._zmq_sock.send_multipart(data, zmq.DONTWAIT)
return True
except zmq.ZMQError as exc:
if exc.errno in (errno.EAGAIN, errno.EINTR):
self._loop.add_writer(self._zmq_sock,
self._write_ready)
return False
else:
raise OSError(exc.errno, exc.strerror) from exc
def _write_ready(self):
assert self._buffer, 'Data should not be empty'
try:
try:
self._zmq_sock.send_multipart(self._buffer[0][1], zmq.DONTWAIT)
except zmq.ZMQError as exc:
if exc.errno in (errno.EAGAIN, errno.EINTR):
return
else:
raise OSError(exc.errno, exc.strerror) from exc
except Exception as exc:
self._fatal_error(exc,
'Fatal write error on zmq socket transport')
else:
sent_len, sent_data = self._buffer.popleft()
self._buffer_size -= sent_len
self._maybe_resume_protocol()
if not self._buffer:
self._loop.remove_writer(self._zmq_sock)
if self._closing:
self._call_connection_lost(None)
def close(self):
if self._closing:
return
self._closing = True
if self._monitor:
self._disable_monitor()
if not self._paused:
self._loop.remove_reader(self._zmq_sock)
if not self._buffer:
self._conn_lost += 1
self._loop.call_soon(self._call_connection_lost, None)
def _force_close(self, exc):
if self._conn_lost:
return
if self._monitor:
self._disable_monitor()
if self._buffer:
self._buffer.clear()
self._buffer_size = 0
self._loop.remove_writer(self._zmq_sock)
if not self._closing:
self._closing = True
if not self._paused:
self._loop.remove_reader(self._zmq_sock)
self._conn_lost += 1
self._loop.call_soon(self._call_connection_lost, exc)
def _do_pause_reading(self):
self._loop.remove_reader(self._zmq_sock)
def _do_resume_reading(self):
self._loop.add_reader(self._zmq_sock, self._read_ready)
class _ZmqLooplessTransportImpl(_BaseTransport):
def __init__(self, loop, zmq_type, zmq_sock, protocol, waiter):
super().__init__(loop, zmq_type, zmq_sock, protocol)
fd = zmq_sock.getsockopt(zmq.FD)
self._fd = fd
self._loop.add_reader(fd, self._read_ready)
self._loop.call_soon(self._protocol.connection_made, self)
self._loop.call_soon(waiter.set_result, None)
self._soon_call = None
def _read_ready(self):
self._soon_call = None
if self._zmq_sock is None:
return
events = self._zmq_sock.getsockopt(zmq.EVENTS)
try_again = False
if not self._paused and events & zmq.POLLIN:
self._do_read()
try_again = True
if self._buffer and events & zmq.POLLOUT:
self._do_write()
if not try_again:
try_again = bool(self._buffer)
if try_again:
postevents = self._zmq_sock.getsockopt(zmq.EVENTS)
if postevents & zmq.POLLIN:
schedule = True
elif self._buffer and postevents & zmq.POLLOUT:
schedule = True
else:
schedule = False
if schedule:
self._soon_call = self._loop.call_soon(self._read_ready)
def _do_read(self):
try:
try:
data = self._zmq_sock.recv_multipart(zmq.NOBLOCK)
except zmq.ZMQError as exc:
if exc.errno in (errno.EAGAIN, errno.EINTR):
return
else:
raise OSError(exc.errno, exc.strerror) from exc
except Exception as exc:
self._fatal_error(exc, 'Fatal read error on zmq socket transport')
else:
self._protocol.msg_received(data)
def _do_write(self):
if not self._buffer:
return
try:
try:
self._zmq_sock.send_multipart(self._buffer[0][1], zmq.DONTWAIT)
except zmq.ZMQError as exc:
if exc.errno in (errno.EAGAIN, errno.EINTR):
if self._soon_call is None:
self._soon_call = self._loop.call_soon(
self._read_ready)
return
else:
raise OSError(exc.errno, exc.strerror) from exc
except Exception as exc:
self._fatal_error(exc,
'Fatal write error on zmq socket transport')
else:
sent_len, sent_data = self._buffer.popleft()
self._buffer_size -= sent_len
self._maybe_resume_protocol()
if not self._buffer and self._closing:
self._loop.remove_reader(self._fd)
self._call_connection_lost(None)
else:
if self._soon_call is None:
self._soon_call = self._loop.call_soon(self._read_ready)
def _do_send(self, data):
try:
self._zmq_sock.send_multipart(data, zmq.DONTWAIT)
if self._soon_call is None:
self._soon_call = self._loop.call_soon(self._read_ready)
return True
except zmq.ZMQError as exc:
if exc.errno not in (errno.EAGAIN, errno.EINTR):
raise OSError(exc.errno, exc.strerror) from exc
else:
if self._soon_call is None:
self._soon_call = self._loop.call_soon(self._read_ready)
return False
def close(self):
if self._closing:
return
self._closing = True
if self._monitor:
self._disable_monitor()
if not self._buffer:
self._conn_lost += 1
if not self._paused:
self._loop.remove_reader(self._fd)
self._loop.call_soon(self._call_connection_lost, None)
def _force_close(self, exc):
if self._conn_lost:
return
if self._monitor:
self._disable_monitor()
if self._buffer:
self._buffer.clear()
self._buffer_size = 0
self._closing = True
self._loop.remove_reader(self._fd)
self._conn_lost += 1
self._loop.call_soon(self._call_connection_lost, exc)
def _do_pause_reading(self):
pass
def _do_resume_reading(self):
self._read_ready()
def _call_connection_lost(self, exc):
try:
super()._call_connection_lost(exc)
finally:
self._soon_call = None
class ZmqEventLoopPolicy(asyncio.AbstractEventLoopPolicy):
"""ZeroMQ policy implementation for accessing the event loop.
In this policy, each thread has its own event loop. However, we
only automatically create an event loop by default for the main
thread; other threads by default have no event loop.
"""
class _Local(threading.local):
_loop = None
_set_called = False
def __init__(self):
self._local = self._Local()
self._watcher = None
def get_event_loop(self):
"""Get the event loop.
If current thread is the main thread and there are no
registered event loop for current thread then the call creates
new event loop and registers it.
Return an instance of ZmqEventLoop.
Raise RuntimeError if there is no registered event loop
for current thread.
"""
if (self._local._loop is None and
not self._local._set_called and
isinstance(threading.current_thread(), threading._MainThread)):
self.set_event_loop(self.new_event_loop())
assert self._local._loop is not None, \
('There is no current event loop in thread %r.' %
threading.current_thread().name)
return self._local._loop
def new_event_loop(self):
"""Create a new event loop.
You must call set_event_loop() to make this the current event
loop.
"""
return ZmqEventLoop()
def set_event_loop(self, loop):
"""Set the event loop.
As a side effect, if a child watcher was set before, then calling
.set_event_loop() from the main thread will call .attach_loop(loop) on
the child watcher.
"""
self._local._set_called = True
assert loop is None or isinstance(loop, asyncio.AbstractEventLoop), \
"loop should be None or AbstractEventLoop instance"
self._local._loop = loop
if (self._watcher is not None and
isinstance(threading.current_thread(), threading._MainThread)):
self._watcher.attach_loop(loop)
if sys.platform != 'win32':
def _init_watcher(self):
with asyncio.events._lock:
if self._watcher is None: # pragma: no branch
self._watcher = SafeChildWatcher()
if isinstance(threading.current_thread(),
threading._MainThread):
self._watcher.attach_loop(self._local._loop)
def get_child_watcher(self):
"""Get the child watcher.
If not yet set, a SafeChildWatcher object is automatically created.
"""
if self._watcher is None:
self._init_watcher()
return self._watcher
def set_child_watcher(self, watcher):
"""Set the child watcher."""
assert watcher is None or \
isinstance(watcher, asyncio.AbstractChildWatcher), \
"watcher should be None or AbstractChildWatcher instance"
if self._watcher is not None:
self._watcher.close()
self._watcher = watcher