Edit File: http_writer.py
"""Http related parsers and protocol.""" import asyncio import zlib from typing import Any, Awaitable, Callable, NamedTuple, Optional, Union # noqa from multidict import CIMultiDict from .abc import AbstractStreamWriter from .base_protocol import BaseProtocol from .helpers import NO_EXTENSIONS __all__ = ("StreamWriter", "HttpVersion", "HttpVersion10", "HttpVersion11") class HttpVersion(NamedTuple): major: int minor: int HttpVersion10 = HttpVersion(1, 0) HttpVersion11 = HttpVersion(1, 1) _T_OnChunkSent = Optional[Callable[[bytes], Awaitable[None]]] _T_OnHeadersSent = Optional[Callable[["CIMultiDict[str]"], Awaitable[None]]] class StreamWriter(AbstractStreamWriter): def __init__( self, protocol: BaseProtocol, loop: asyncio.AbstractEventLoop, on_chunk_sent: _T_OnChunkSent = None, on_headers_sent: _T_OnHeadersSent = None, ) -> None: self._protocol = protocol self.loop = loop self.length = None self.chunked = False self.buffer_size = 0 self.output_size = 0 self._eof = False self._compress: Any = None self._drain_waiter = None self._on_chunk_sent: _T_OnChunkSent = on_chunk_sent self._on_headers_sent: _T_OnHeadersSent = on_headers_sent @property def transport(self) -> Optional[asyncio.Transport]: return self._protocol.transport @property def protocol(self) -> BaseProtocol: return self._protocol def enable_chunking(self) -> None: self.chunked = True def enable_compression( self, encoding: str = "deflate", strategy: int = zlib.Z_DEFAULT_STRATEGY ) -> None: zlib_mode = 16 + zlib.MAX_WBITS if encoding == "gzip" else zlib.MAX_WBITS self._compress = zlib.compressobj(wbits=zlib_mode, strategy=strategy) def _write(self, chunk: bytes) -> None: size = len(chunk) self.buffer_size += size self.output_size += size transport = self.transport if not self._protocol.connected or transport is None or transport.is_closing(): raise ConnectionResetError("Cannot write to closing transport") transport.write(chunk) async def write( self, chunk: bytes, *, drain: bool = True, LIMIT: int = 0x10000 ) -> None: """Writes chunk of data to a stream. write_eof() indicates end of stream. writer can't be used after write_eof() method being called. write() return drain future. """ if self._on_chunk_sent is not None: await self._on_chunk_sent(chunk) if isinstance(chunk, memoryview): if chunk.nbytes != len(chunk): # just reshape it chunk = chunk.cast("c") if self._compress is not None: chunk = self._compress.compress(chunk) if not chunk: return if self.length is not None: chunk_len = len(chunk) if self.length >= chunk_len: self.length = self.length - chunk_len else: chunk = chunk[: self.length] self.length = 0 if not chunk: return if chunk: if self.chunked: chunk_len_pre = ("%x\r\n" % len(chunk)).encode("ascii") chunk = chunk_len_pre + chunk + b"\r\n" self._write(chunk) if self.buffer_size > LIMIT and drain: self.buffer_size = 0 await self.drain() async def write_headers( self, status_line: str, headers: "CIMultiDict[str]" ) -> None: """Write request/response status and headers.""" if self._on_headers_sent is not None: await self._on_headers_sent(headers) # status + headers buf = _serialize_headers(status_line, headers) self._write(buf) async def write_eof(self, chunk: bytes = b"") -> None: if self._eof: return if chunk and self._on_chunk_sent is not None: await self._on_chunk_sent(chunk) if self._compress: if chunk: chunk = self._compress.compress(chunk) chunk = chunk + self._compress.flush() if chunk and self.chunked: chunk_len = ("%x\r\n" % len(chunk)).encode("ascii") chunk = chunk_len + chunk + b"\r\n0\r\n\r\n" else: if self.chunked: if chunk: chunk_len = ("%x\r\n" % len(chunk)).encode("ascii") chunk = chunk_len + chunk + b"\r\n0\r\n\r\n" else: chunk = b"0\r\n\r\n" if chunk: self._write(chunk) await self.drain() self._eof = True async def drain(self) -> None: """Flush the write buffer. The intended use is to write await w.write(data) await w.drain() """ if self._protocol.transport is not None: await self._protocol._drain_helper() def _safe_header(string: str) -> str: if "\r" in string or "\n" in string: raise ValueError( "Newline or carriage return detected in headers. " "Potential header injection attack." ) return string def _py_serialize_headers(status_line: str, headers: "CIMultiDict[str]") -> bytes: headers_gen = (_safe_header(k) + ": " + _safe_header(v) for k, v in headers.items()) line = status_line + "\r\n" + "\r\n".join(headers_gen) + "\r\n\r\n" return line.encode("utf-8") _serialize_headers = _py_serialize_headers try: import aiohttp._http_writer as _http_writer # type: ignore[import] _c_serialize_headers = _http_writer._serialize_headers if not NO_EXTENSIONS: _serialize_headers = _c_serialize_headers except ImportError: pass
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