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"""WebSocket client for asyncio."""
import asyncio
import json
import async_timeout
from .client_exceptions import ClientError
from .helpers import call_later, set_result
from .http import (WS_CLOSED_MESSAGE, WS_CLOSING_MESSAGE, WebSocketError,
WSMessage, WSMsgType)
class ClientWebSocketResponse:
def __init__(self, reader, writer, protocol,
response, timeout, autoclose, autoping, loop, *,
receive_timeout=None, heartbeat=None,
compress=0, client_notakeover=False):
self._response = response
self._conn = response.connection
self._writer = writer
self._reader = reader
self._protocol = protocol
self._closed = False
self._closing = False
self._close_code = None
self._timeout = timeout
self._receive_timeout = receive_timeout
self._autoclose = autoclose
self._autoping = autoping
self._heartbeat = heartbeat
self._heartbeat_cb = None
if heartbeat is not None:
self._pong_heartbeat = heartbeat/2.0
self._pong_response_cb = None
self._loop = loop
self._waiting = None
self._exception = None
self._compress = compress
self._client_notakeover = client_notakeover
self._reset_heartbeat()
def _cancel_heartbeat(self):
if self._pong_response_cb is not None:
self._pong_response_cb.cancel()
self._pong_response_cb = None
if self._heartbeat_cb is not None:
self._heartbeat_cb.cancel()
self._heartbeat_cb = None
def _reset_heartbeat(self):
self._cancel_heartbeat()
if self._heartbeat is not None:
self._heartbeat_cb = call_later(
self._send_heartbeat, self._heartbeat, self._loop)
def _send_heartbeat(self):
if self._heartbeat is not None and not self._closed:
self._writer.ping()
if self._pong_response_cb is not None:
self._pong_response_cb.cancel()
self._pong_response_cb = call_later(
self._pong_not_received, self._pong_heartbeat, self._loop)
def _pong_not_received(self):
if not self._closed:
self._closed = True
self._close_code = 1006
self._exception = asyncio.TimeoutError()
self._response.close()
@property
def closed(self):
return self._closed
@property
def close_code(self):
return self._close_code
@property
def protocol(self):
return self._protocol
@property
def compress(self):
return self._compress
@property
def client_notakeover(self):
return self._client_notakeover
def get_extra_info(self, name, default=None):
"""extra info from connection transport"""
try:
return self._response.connection.transport.get_extra_info(
name, default)
except Exception:
return default
def exception(self):
return self._exception
async def ping(self, message='b'):
await self._writer.ping(message)
async def pong(self, message='b'):
await self._writer.pong(message)
async def send_str(self, data, compress=None):
if not isinstance(data, str):
raise TypeError('data argument must be str (%r)' % type(data))
await self._writer.send(data, binary=False, compress=compress)
async def send_bytes(self, data, compress=None):
if not isinstance(data, (bytes, bytearray, memoryview)):
raise TypeError('data argument must be byte-ish (%r)' %
type(data))
await self._writer.send(data, binary=True, compress=compress)
async def send_json(self, data, compress=None, *, dumps=json.dumps):
await self.send_str(dumps(data), compress=compress)
async def close(self, *, code=1000, message=b''):
# we need to break `receive()` cycle first,
# `close()` may be called from different task
if self._waiting is not None and not self._closed:
self._reader.feed_data(WS_CLOSING_MESSAGE, 0)
await self._waiting
if not self._closed:
self._cancel_heartbeat()
self._closed = True
try:
self._writer.close(code, message)
except asyncio.CancelledError:
self._close_code = 1006
self._response.close()
raise
except Exception as exc:
self._close_code = 1006
self._exception = exc
self._response.close()
return True
if self._closing:
self._response.close()
return True
while True:
try:
with async_timeout.timeout(self._timeout, loop=self._loop):
msg = await self._reader.read()
except asyncio.CancelledError:
self._close_code = 1006
self._response.close()
raise
except Exception as exc:
self._close_code = 1006
self._exception = exc
self._response.close()
return True
if msg.type == WSMsgType.CLOSE:
self._close_code = msg.data
self._response.close()
return True
else:
return False
async def receive(self, timeout=None):
while True:
if self._waiting is not None:
raise RuntimeError(
'Concurrent call to receive() is not allowed')
if self._closed:
return WS_CLOSED_MESSAGE
elif self._closing:
await self.close()
return WS_CLOSED_MESSAGE
try:
self._waiting = self._loop.create_future()
try:
with async_timeout.timeout(
timeout or self._receive_timeout,
loop=self._loop):
msg = await self._reader.read()
self._reset_heartbeat()
finally:
waiter = self._waiting
self._waiting = None
set_result(waiter, True)
except (asyncio.CancelledError, asyncio.TimeoutError):
self._close_code = 1006
raise
except ClientError:
self._closed = True
self._close_code = 1006
return WS_CLOSED_MESSAGE
except WebSocketError as exc:
self._close_code = exc.code
await self.close(code=exc.code)
return WSMessage(WSMsgType.ERROR, exc, None)
except Exception as exc:
self._exception = exc
self._closing = True
self._close_code = 1006
await self.close()
return WSMessage(WSMsgType.ERROR, exc, None)
if msg.type == WSMsgType.CLOSE:
self._closing = True
self._close_code = msg.data
if not self._closed and self._autoclose:
await self.close()
elif msg.type == WSMsgType.CLOSING:
self._closing = True
elif msg.type == WSMsgType.PING and self._autoping:
await self.pong(msg.data)
continue
elif msg.type == WSMsgType.PONG and self._autoping:
continue
return msg
async def receive_str(self, *, timeout=None):
msg = await self.receive(timeout)
if msg.type != WSMsgType.TEXT:
raise TypeError(
"Received message {}:{!r} is not str".format(msg.type,
msg.data))
return msg.data
async def receive_bytes(self, *, timeout=None):
msg = await self.receive(timeout)
if msg.type != WSMsgType.BINARY:
raise TypeError(
"Received message {}:{!r} is not bytes".format(msg.type,
msg.data))
return msg.data
async def receive_json(self, *, loads=json.loads, timeout=None):
data = await self.receive_str(timeout=timeout)
return loads(data)
def __aiter__(self):
return self
async def __anext__(self):
msg = await self.receive()
if msg.type in (WSMsgType.CLOSE,
WSMsgType.CLOSING,
WSMsgType.CLOSED):
raise StopAsyncIteration # NOQA
return msg
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