mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-29 10:14:15 +01:00
252 lines
8 KiB
Python
252 lines
8 KiB
Python
|
import asyncio
|
||
|
|
from contextlib import suppress
|
||
|
|
from typing import Any, Optional, Tuple
|
||
|
|
|
||
|
|
from .base_protocol import BaseProtocol
|
||
|
|
from .client_exceptions import (
|
||
|
|
ClientOSError,
|
||
|
|
ClientPayloadError,
|
||
|
|
ServerDisconnectedError,
|
||
|
|
ServerTimeoutError,
|
||
|
|
)
|
||
|
|
from .helpers import BaseTimerContext
|
||
|
|
from .http import HttpResponseParser, RawResponseMessage
|
||
|
|
from .streams import EMPTY_PAYLOAD, DataQueue, StreamReader
|
||
|
|
|
||
|
|
|
||
|
|
class ResponseHandler(BaseProtocol, DataQueue[Tuple[RawResponseMessage, StreamReader]]):
|
||
|
|
"""Helper class to adapt between Protocol and StreamReader."""
|
||
|
|
|
||
|
|
def __init__(self, loop: asyncio.AbstractEventLoop) -> None:
|
||
|
|
BaseProtocol.__init__(self, loop=loop)
|
||
|
|
DataQueue.__init__(self, loop)
|
||
|
|
|
||
|
|
self._should_close = False
|
||
|
|
|
||
|
|
self._payload = None
|
||
|
|
self._skip_payload = False
|
||
|
|
self._payload_parser = None
|
||
|
|
|
||
|
|
self._timer = None
|
||
|
|
|
||
|
|
self._tail = b""
|
||
|
|
self._upgraded = False
|
||
|
|
self._parser = None # type: Optional[HttpResponseParser]
|
||
|
|
|
||
|
|
self._read_timeout = None # type: Optional[float]
|
||
|
|
self._read_timeout_handle = None # type: Optional[asyncio.TimerHandle]
|
||
|
|
|
||
|
|
@property
|
||
|
|
def upgraded(self) -> bool:
|
||
|
|
return self._upgraded
|
||
|
|
|
||
|
|
@property
|
||
|
|
def should_close(self) -> bool:
|
||
|
|
if self._payload is not None and not self._payload.is_eof() or self._upgraded:
|
||
|
|
return True
|
||
|
|
|
||
|
|
return (
|
||
|
|
self._should_close
|
||
|
|
or self._upgraded
|
||
|
|
or self.exception() is not None
|
||
|
|
or self._payload_parser is not None
|
||
|
|
or len(self) > 0
|
||
|
|
or bool(self._tail)
|
||
|
|
)
|
||
|
|
|
||
|
|
def force_close(self) -> None:
|
||
|
|
self._should_close = True
|
||
|
|
|
||
|
|
def close(self) -> None:
|
||
|
|
transport = self.transport
|
||
|
|
if transport is not None:
|
||
|
|
transport.close()
|
||
|
|
self.transport = None
|
||
|
|
self._payload = None
|
||
|
|
self._drop_timeout()
|
||
|
|
|
||
|
|
def is_connected(self) -> bool:
|
||
|
|
return self.transport is not None and not self.transport.is_closing()
|
||
|
|
|
||
|
|
def connection_lost(self, exc: Optional[BaseException]) -> None:
|
||
|
|
self._drop_timeout()
|
||
|
|
|
||
|
|
if self._payload_parser is not None:
|
||
|
|
with suppress(Exception):
|
||
|
|
self._payload_parser.feed_eof()
|
||
|
|
|
||
|
|
uncompleted = None
|
||
|
|
if self._parser is not None:
|
||
|
|
try:
|
||
|
|
uncompleted = self._parser.feed_eof()
|
||
|
|
except Exception:
|
||
|
|
if self._payload is not None:
|
||
|
|
self._payload.set_exception(
|
||
|
|
ClientPayloadError("Response payload is not completed")
|
||
|
|
)
|
||
|
|
|
||
|
|
if not self.is_eof():
|
||
|
|
if isinstance(exc, OSError):
|
||
|
|
exc = ClientOSError(*exc.args)
|
||
|
|
if exc is None:
|
||
|
|
exc = ServerDisconnectedError(uncompleted)
|
||
|
|
# assigns self._should_close to True as side effect,
|
||
|
|
# we do it anyway below
|
||
|
|
self.set_exception(exc)
|
||
|
|
|
||
|
|
self._should_close = True
|
||
|
|
self._parser = None
|
||
|
|
self._payload = None
|
||
|
|
self._payload_parser = None
|
||
|
|
self._reading_paused = False
|
||
|
|
|
||
|
|
super().connection_lost(exc)
|
||
|
|
|
||
|
|
def eof_received(self) -> None:
|
||
|
|
# should call parser.feed_eof() most likely
|
||
|
|
self._drop_timeout()
|
||
|
|
|
||
|
|
def pause_reading(self) -> None:
|
||
|
|
super().pause_reading()
|
||
|
|
self._drop_timeout()
|
||
|
|
|
||
|
|
def resume_reading(self) -> None:
|
||
|
|
super().resume_reading()
|
||
|
|
self._reschedule_timeout()
|
||
|
|
|
||
|
|
def set_exception(self, exc: BaseException) -> None:
|
||
|
|
self._should_close = True
|
||
|
|
self._drop_timeout()
|
||
|
|
super().set_exception(exc)
|
||
|
|
|
||
|
|
def set_parser(self, parser: Any, payload: Any) -> None:
|
||
|
|
# TODO: actual types are:
|
||
|
|
# parser: WebSocketReader
|
||
|
|
# payload: FlowControlDataQueue
|
||
|
|
# but they are not generi enough
|
||
|
|
# Need an ABC for both types
|
||
|
|
self._payload = payload
|
||
|
|
self._payload_parser = parser
|
||
|
|
|
||
|
|
self._drop_timeout()
|
||
|
|
|
||
|
|
if self._tail:
|
||
|
|
data, self._tail = self._tail, b""
|
||
|
|
self.data_received(data)
|
||
|
|
|
||
|
|
def set_response_params(
|
||
|
|
self,
|
||
|
|
*,
|
||
|
|
timer: Optional[BaseTimerContext] = None,
|
||
|
|
skip_payload: bool = False,
|
||
|
|
read_until_eof: bool = False,
|
||
|
|
auto_decompress: bool = True,
|
||
|
|
read_timeout: Optional[float] = None,
|
||
|
|
read_bufsize: int = 2 ** 16
|
||
|
|
) -> None:
|
||
|
|
self._skip_payload = skip_payload
|
||
|
|
|
||
|
|
self._read_timeout = read_timeout
|
||
|
|
self._reschedule_timeout()
|
||
|
|
|
||
|
|
self._parser = HttpResponseParser(
|
||
|
|
self,
|
||
|
|
self._loop,
|
||
|
|
read_bufsize,
|
||
|
|
timer=timer,
|
||
|
|
payload_exception=ClientPayloadError,
|
||
|
|
response_with_body=not skip_payload,
|
||
|
|
read_until_eof=read_until_eof,
|
||
|
|
auto_decompress=auto_decompress,
|
||
|
|
)
|
||
|
|
|
||
|
|
if self._tail:
|
||
|
|
data, self._tail = self._tail, b""
|
||
|
|
self.data_received(data)
|
||
|
|
|
||
|
|
def _drop_timeout(self) -> None:
|
||
|
|
if self._read_timeout_handle is not None:
|
||
|
|
self._read_timeout_handle.cancel()
|
||
|
|
self._read_timeout_handle = None
|
||
|
|
|
||
|
|
def _reschedule_timeout(self) -> None:
|
||
|
|
timeout = self._read_timeout
|
||
|
|
if self._read_timeout_handle is not None:
|
||
|
|
self._read_timeout_handle.cancel()
|
||
|
|
|
||
|
|
if timeout:
|
||
|
|
self._read_timeout_handle = self._loop.call_later(
|
||
|
|
timeout, self._on_read_timeout
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
self._read_timeout_handle = None
|
||
|
|
|
||
|
|
def _on_read_timeout(self) -> None:
|
||
|
|
exc = ServerTimeoutError("Timeout on reading data from socket")
|
||
|
|
self.set_exception(exc)
|
||
|
|
if self._payload is not None:
|
||
|
|
self._payload.set_exception(exc)
|
||
|
|
|
||
|
|
def data_received(self, data: bytes) -> None:
|
||
|
|
self._reschedule_timeout()
|
||
|
|
|
||
|
|
if not data:
|
||
|
|
return
|
||
|
|
|
||
|
|
# custom payload parser
|
||
|
|
if self._payload_parser is not None:
|
||
|
|
eof, tail = self._payload_parser.feed_data(data)
|
||
|
|
if eof:
|
||
|
|
self._payload = None
|
||
|
|
self._payload_parser = None
|
||
|
|
|
||
|
|
if tail:
|
||
|
|
self.data_received(tail)
|
||
|
|
return
|
||
|
|
else:
|
||
|
|
if self._upgraded or self._parser is None:
|
||
|
|
# i.e. websocket connection, websocket parser is not set yet
|
||
|
|
self._tail += data
|
||
|
|
else:
|
||
|
|
# parse http messages
|
||
|
|
try:
|
||
|
|
messages, upgraded, tail = self._parser.feed_data(data)
|
||
|
|
except BaseException as exc:
|
||
|
|
if self.transport is not None:
|
||
|
|
# connection.release() could be called BEFORE
|
||
|
|
# data_received(), the transport is already
|
||
|
|
# closed in this case
|
||
|
|
self.transport.close()
|
||
|
|
# should_close is True after the call
|
||
|
|
self.set_exception(exc)
|
||
|
|
return
|
||
|
|
|
||
|
|
self._upgraded = upgraded
|
||
|
|
|
||
|
|
payload = None
|
||
|
|
for message, payload in messages:
|
||
|
|
if message.should_close:
|
||
|
|
self._should_close = True
|
||
|
|
|
||
|
|
self._payload = payload
|
||
|
|
|
||
|
|
if self._skip_payload or message.code in (204, 304):
|
||
|
|
self.feed_data((message, EMPTY_PAYLOAD), 0) # type: ignore
|
||
|
|
else:
|
||
|
|
self.feed_data((message, payload), 0)
|
||
|
|
if payload is not None:
|
||
|
|
# new message(s) was processed
|
||
|
|
# register timeout handler unsubscribing
|
||
|
|
# either on end-of-stream or immediately for
|
||
|
|
# EMPTY_PAYLOAD
|
||
|
|
if payload is not EMPTY_PAYLOAD:
|
||
|
|
payload.on_eof(self._drop_timeout)
|
||
|
|
else:
|
||
|
|
self._drop_timeout()
|
||
|
|
|
||
|
|
if tail:
|
||
|
|
if upgraded:
|
||
|
|
self.data_received(tail)
|
||
|
|
else:
|
||
|
|
self._tail = tail
|