wehub-resource-sync
130 lines
4.1 KiB
Python
130 lines
4.1 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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# ruff: noqa: F401
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"""Utilities used in tornado."""
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import errno
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import socket
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from tornado import ioloop
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class TCPHandler:
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"""TCP socket handler backed tornado event loop.
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Parameters
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----------
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sock : Socket
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The TCP socket, will set it to non-blocking mode.
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"""
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def __init__(self, sock):
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self._sock = sock
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self._ioloop = ioloop.IOLoop.current()
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self._sock.setblocking(0)
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self._pending_write = []
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self._signal_close = False
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def _event_handler(_, events):
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self._event_handler(events)
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self._ioloop.add_handler(
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self._sock.fileno(), _event_handler, self._ioloop.READ | self._ioloop.ERROR
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)
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def signal_close(self):
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"""Signal the handler to close.
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The handler will be closed after the existing
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pending message are sent to the peer.
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"""
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if not self._pending_write:
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self.close()
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else:
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self._signal_close = True
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def close(self):
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"""Close the socket"""
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if self._sock is not None:
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try:
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self._ioloop.remove_handler(self._sock.fileno())
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self._sock.close()
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except OSError:
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pass
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self._sock = None
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self.on_close()
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def write_message(self, message, binary=True):
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assert binary
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if self._sock is None:
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raise OSError("socket is already closed")
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self._pending_write.append(message)
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self._update_write()
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def _event_handler(self, events):
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"""centeral event handler"""
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if (events & self._ioloop.ERROR) or (events & self._ioloop.READ):
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if self._update_read() and (events & self._ioloop.WRITE):
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self._update_write()
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elif events & self._ioloop.WRITE:
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self._update_write()
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def _update_write(self):
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"""Update the state on write"""
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while self._pending_write:
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try:
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msg = self._pending_write[0]
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if self._sock is None:
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return
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nsend = self._sock.send(msg)
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if nsend != len(msg):
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self._pending_write[0] = msg[nsend:]
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else:
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self._pending_write.pop(0)
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except OSError as err:
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if err.args[0] in (errno.EAGAIN, errno.EWOULDBLOCK):
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break
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self.on_error(err)
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if self._pending_write:
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self._ioloop.update_handler(
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self._sock.fileno(), self._ioloop.READ | self._ioloop.ERROR | self._ioloop.WRITE
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)
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else:
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if self._signal_close:
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self.close()
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else:
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self._ioloop.update_handler(
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self._sock.fileno(), self._ioloop.READ | self._ioloop.ERROR
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)
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def _update_read(self):
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"""Update state when there is read event"""
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try:
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msg = bytes(self._sock.recv(4096))
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if msg:
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self.on_message(msg)
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return True
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# normal close, remote is closed
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self.close()
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except OSError as err:
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if err.args[0] in (errno.EAGAIN, errno.EWOULDBLOCK):
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pass
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else:
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self.on_error(err)
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return False
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