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169 lines
5.0 KiB
169 lines
5.0 KiB
"""Http related parsers and protocol."""
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import asyncio
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import collections
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import zlib
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from typing import Any, Awaitable, Callable, Optional, Union # noqa
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from .abc import AbstractStreamWriter
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from .base_protocol import BaseProtocol
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from .helpers import NO_EXTENSIONS
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__all__ = ('StreamWriter', 'HttpVersion', 'HttpVersion10', 'HttpVersion11')
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HttpVersion = collections.namedtuple('HttpVersion', ['major', 'minor'])
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HttpVersion10 = HttpVersion(1, 0)
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HttpVersion11 = HttpVersion(1, 1)
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_T_Data = Union[bytes, bytearray, memoryview]
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_T_OnChunkSent = Optional[Callable[[_T_Data], Awaitable[None]]]
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class StreamWriter(AbstractStreamWriter):
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def __init__(self,
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protocol: BaseProtocol,
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loop: asyncio.AbstractEventLoop,
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on_chunk_sent: _T_OnChunkSent = None) -> None:
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self._protocol = protocol
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self._transport = protocol.transport
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self.loop = loop
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self.length = None
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self.chunked = False
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self.buffer_size = 0
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self.output_size = 0
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self._eof = False
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self._compress = None # type: Any
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self._drain_waiter = None
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self._on_chunk_sent = on_chunk_sent # type: _T_OnChunkSent
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@property
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def transport(self) -> asyncio.Transport:
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return self._transport
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@property
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def protocol(self) -> BaseProtocol:
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return self._protocol
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def enable_chunking(self) -> None:
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self.chunked = True
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def enable_compression(self, encoding: str='deflate') -> None:
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zlib_mode = (16 + zlib.MAX_WBITS
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if encoding == 'gzip' else -zlib.MAX_WBITS)
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self._compress = zlib.compressobj(wbits=zlib_mode)
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def _write(self, chunk) -> None:
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size = len(chunk)
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self.buffer_size += size
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self.output_size += size
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if self._transport is None or self._transport.is_closing():
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raise ConnectionResetError('Cannot write to closing transport')
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self._transport.write(chunk)
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async def write(self, chunk, *, drain=True, LIMIT=0x10000) -> None:
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"""Writes chunk of data to a stream.
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write_eof() indicates end of stream.
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writer can't be used after write_eof() method being called.
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write() return drain future.
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"""
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if self._on_chunk_sent is not None:
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await self._on_chunk_sent(chunk)
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if self._compress is not None:
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chunk = self._compress.compress(chunk)
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if not chunk:
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return
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if self.length is not None:
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chunk_len = len(chunk)
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if self.length >= chunk_len:
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self.length = self.length - chunk_len
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else:
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chunk = chunk[:self.length]
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self.length = 0
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if not chunk:
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return
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if chunk:
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if self.chunked:
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chunk_len = ('%x\r\n' % len(chunk)).encode('ascii')
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chunk = chunk_len + chunk + b'\r\n'
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self._write(chunk)
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if self.buffer_size > LIMIT and drain:
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self.buffer_size = 0
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await self.drain()
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async def write_headers(self, status_line, headers) -> None:
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"""Write request/response status and headers."""
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# status + headers
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buf = _serialize_headers(status_line, headers)
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self._write(buf)
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async def write_eof(self, chunk=b'') -> None:
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if self._eof:
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return
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if chunk and self._on_chunk_sent is not None:
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await self._on_chunk_sent(chunk)
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if self._compress:
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if chunk:
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chunk = self._compress.compress(chunk)
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chunk = chunk + self._compress.flush()
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if chunk and self.chunked:
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chunk_len = ('%x\r\n' % len(chunk)).encode('ascii')
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chunk = chunk_len + chunk + b'\r\n0\r\n\r\n'
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else:
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if self.chunked:
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if chunk:
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chunk_len = ('%x\r\n' % len(chunk)).encode('ascii')
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chunk = chunk_len + chunk + b'\r\n0\r\n\r\n'
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else:
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chunk = b'0\r\n\r\n'
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if chunk:
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self._write(chunk)
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await self.drain()
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self._eof = True
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self._transport = None
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async def drain(self) -> None:
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"""Flush the write buffer.
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The intended use is to write
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await w.write(data)
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await w.drain()
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"""
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if self._protocol.transport is not None:
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await self._protocol._drain_helper()
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def _py_serialize_headers(status_line, headers):
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headers = status_line + '\r\n' + ''.join(
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[k + ': ' + v + '\r\n' for k, v in headers.items()])
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return headers.encode('utf-8') + b'\r\n'
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_serialize_headers = _py_serialize_headers
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try:
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import aiohttp._http_writer as _http_writer # type: ignore
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_c_serialize_headers = _http_writer._serialize_headers
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if not NO_EXTENSIONS: # pragma: no cover
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_serialize_headers = _c_serialize_headers
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except ImportError:
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pass
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