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streams.py
import asyncio import collections import warnings from typing import ( Awaitable, Callable, Deque, Final, Generic, List, Optional, Tuple, TypeVar, ) from .base_protocol import BaseProtocol from .helpers import BaseTimerContext, TimerNoop, set_exception, set_result from .log import internal_logger __all__ = ( "EMPTY_PAYLOAD", "EofStream", "StreamReader", "DataQueue", "FlowControlDataQueue", ) _T = TypeVar("_T") class EofStream(Exception): """eof stream indication.""" class AsyncStreamIterator(Generic[_T]): def __init__(self, read_func: Callable[[], Awaitable[_T]]) -> None: self.read_func = read_func def __aiter__(self) -> "AsyncStreamIterator[_T]": return self async def __anext__(self) -> _T: try: rv = await self.read_func() except EofStream: raise StopAsyncIteration if rv == b"": raise StopAsyncIteration return rv class ChunkTupleAsyncStreamIterator: def __init__(self, stream: "StreamReader") -> None: self._stream = stream def __aiter__(self) -> "ChunkTupleAsyncStreamIterator": return self async def __anext__(self) -> Tuple[bytes, bool]: rv = await self._stream.readchunk() if rv == (b"", False): raise StopAsyncIteration return rv class AsyncStreamReaderMixin: def __aiter__(self) -> AsyncStreamIterator[bytes]: return AsyncStreamIterator(self.readline) # type: ignore[attr-defined] def iter_chunked(self, n: int) -> AsyncStreamIterator[bytes]: """Returns an asynchronous iterator that yields chunks of size n.""" return AsyncStreamIterator(lambda: self.read(n)) # type: ignore[attr-defined] def iter_any(self) -> AsyncStreamIterator[bytes]: """Yield all available data as soon as it is received.""" return AsyncStreamIterator(self.readany) # type: ignore[attr-defined] def iter_chunks(self) -> ChunkTupleAsyncStreamIterator: """Yield chunks of data as they are received by the server. The yielded objects are tuples of (bytes, bool) as returned by the StreamReader.readchunk method. """ return ChunkTupleAsyncStreamIterator(self) # type: ignore[arg-type] class StreamReader(AsyncStreamReaderMixin): """An enhancement of asyncio.StreamReader. Supports asynchronous iteration by line, chunk or as available:: async for line in reader: ... async for chunk in reader.iter_chunked(1024): ... async for slice in reader.iter_any(): ... """ total_bytes = 0 def __init__( self, protocol: BaseProtocol, limit: int, *, timer: Optional[BaseTimerContext] = None, loop: Optional[asyncio.AbstractEventLoop] = None, ) -> None: self._protocol = protocol self._low_water = limit self._high_water = limit * 2 if loop is None: loop = asyncio.get_event_loop() self._loop = loop self._size = 0 self._cursor = 0 self._http_chunk_splits: Optional[List[int]] = None self._buffer: Deque[bytes] = collections.deque() self._buffer_offset = 0 self._eof = False self._waiter: Optional[asyncio.Future[None]] = None self._eof_waiter: Optional[asyncio.Future[None]] = None self._exception: Optional[BaseException] = None self._timer = TimerNoop() if timer is None else timer self._eof_callbacks: List[Callable[[], None]] = [] def __repr__(self) -> str: info = [self.__class__.__name__] if self._size: info.append("%d bytes" % self._size) if self._eof: info.append("eof") if self._low_water != 2**16: # default limit info.append("low=%d high=%d" % (self._low_water, self._high_water)) if self._waiter: info.append("w=%r" % self._waiter) if self._exception: info.append("e=%r" % self._exception) return "<%s>" % " ".join(info) def get_read_buffer_limits(self) -> Tuple[int, int]: return (self._low_water, self._high_water) def exception(self) -> Optional[BaseException]: return self._exception def set_exception(self, exc: BaseException) -> None: self._exception = exc self._eof_callbacks.clear() waiter = self._waiter if waiter is not None: self._waiter = None set_exception(waiter, exc) waiter = self._eof_waiter if waiter is not None: self._eof_waiter = None set_exception(waiter, exc) def on_eof(self, callback: Callable[[], None]) -> None: if self._eof: try: callback() except Exception: internal_logger.exception("Exception in eof callback") else: self._eof_callbacks.append(callback) def feed_eof(self) -> None: self._eof = True waiter = self._waiter if waiter is not None: self._waiter = None set_result(waiter, None) waiter = self._eof_waiter if waiter is not None: self._eof_waiter = None set_result(waiter, None) for cb in self._eof_callbacks: try: cb() except Exception: internal_logger.exception("Exception in eof callback") self._eof_callbacks.clear() def is_eof(self) -> bool: """Return True if 'feed_eof' was called.""" return self._eof def at_eof(self) -> bool: """Return True if the buffer is empty and 'feed_eof' was called.""" return self._eof and not self._buffer async def wait_eof(self) -> None: if self._eof: return assert self._eof_waiter is None self._eof_waiter = self._loop.create_future() try: await self._eof_waiter finally: self._eof_waiter = None def unread_data(self, data: bytes) -> None: """rollback reading some data from stream, inserting it to buffer head.""" warnings.warn( "unread_data() is deprecated " "and will be removed in future releases (#3260)", DeprecationWarning, stacklevel=2, ) if not data: return if self._buffer_offset: self._buffer[0] = self._buffer[0][self._buffer_offset :] self._buffer_offset = 0 self._size += len(data) self._cursor -= len(data) self._buffer.appendleft(data) self._eof_counter = 0 # TODO: size is ignored, remove the param later def feed_data(self, data: bytes, size: int = 0) -> None: assert not self._eof, "feed_data after feed_eof" if not data: return self._size += len(data) self._buffer.append(data) self.total_bytes += len(data) waiter = self._waiter if waiter is not None: self._waiter = None set_result(waiter, None) if self._size > self._high_water and not self._protocol._reading_paused: self._protocol.pause_reading() def begin_http_chunk_receiving(self) -> None: if self._http_chunk_splits is None: if self.total_bytes: raise RuntimeError( "Called begin_http_chunk_receiving when" "some data was already fed" ) self._http_chunk_splits = [] def end_http_chunk_receiving(self) -> None: if self._http_chunk_splits is None: raise RuntimeError( "Called end_chunk_receiving without calling " "begin_chunk_receiving first" ) # self._http_chunk_splits contains logical byte offsets from start of # the body transfer. Each offset is the offset of the end of a chunk. # "Logical" means bytes, accessible for a user. # If no chunks containing logical data were received, current position # is difinitely zero. pos = self._http_chunk_splits[-1] if self._http_chunk_splits else 0 if self.total_bytes == pos: # We should not add empty chunks here. So we check for that. # Note, when chunked + gzip is used, we can receive a chunk # of compressed data, but that data may not be enough for gzip FSM # to yield any uncompressed data. That's why current position may # not change after receiving a chunk. return self._http_chunk_splits.append(self.total_bytes) # wake up readchunk when end of http chunk received waiter = self._waiter if waiter is not None: self._waiter = None set_result(waiter, None) async def _wait(self, func_name: str) -> None: # StreamReader uses a future to link the protocol feed_data() method # to a read coroutine. Running two read coroutines at the same time # would have an unexpected behaviour. It would not possible to know # which coroutine would get the next data. if self._waiter is not None: raise RuntimeError( "%s() called while another coroutine is " "already waiting for incoming data" % func_name ) waiter = self._waiter = self._loop.create_future() try: with self._timer: await waiter finally: self._waiter = None async def readline(self) -> bytes: return await self.readuntil() async def readuntil(self, separator: bytes = b"\n") -> bytes: seplen = len(separator) if seplen == 0: raise ValueError("Separator should be at least one-byte string") if self._exception is not None: raise self._exception chunk = b"" chunk_size = 0 not_enough = True while not_enough: while self._buffer and not_enough: offset = self._buffer_offset ichar = self._buffer[0].find(separator, offset) + 1 # Read from current offset to found separator or to the end. data = self._read_nowait_chunk( ichar - offset + seplen - 1 if ichar else -1 ) chunk += data chunk_size += len(data) if ichar: not_enough = False if chunk_size > self._high_water: raise ValueError("Chunk too big") if self._eof: break if not_enough: await self._wait("readuntil") return chunk async def read(self, n: int = -1) -> bytes: if self._exception is not None: raise self._exception # migration problem; with DataQueue you have to catch # EofStream exception, so common way is to run payload.read() inside # infinite loop. what can cause real infinite loop with StreamReader # lets keep this code one major release. if __debug__: if self._eof and not self._buffer: self._eof_counter = getattr(self, "_eof_counter", 0) + 1 if self._eof_counter > 5: internal_logger.warning( "Multiple access to StreamReader in eof state, " "might be infinite loop.", stack_info=True, ) if not n: return b"" if n < 0: # This used to just loop creating a new waiter hoping to # collect everything in self._buffer, but that would # deadlock if the subprocess sends more than self.limit # bytes. So just call self.readany() until EOF. blocks = [] while True: block = await self.readany() if not block: break blocks.append(block) return b"".join(blocks) # TODO: should be `if` instead of `while` # because waiter maybe triggered on chunk end, # without feeding any data while not self._buffer and not self._eof: await self._wait("read") return self._read_nowait(n) async def readany(self) -> bytes: if self._exception is not None: raise self._exception # TODO: should be `if` instead of `while` # because waiter maybe triggered on chunk end, # without feeding any data while not self._buffer and not self._eof: await self._wait("readany") return self._read_nowait(-1) async def readchunk(self) -> Tuple[bytes, bool]: """Returns a tuple of (data, end_of_http_chunk). When chunked transfer encoding is used, end_of_http_chunk is a boolean indicating if the end of the data corresponds to the end of a HTTP chunk , otherwise it is always False. """ while True: if self._exception is not None: raise self._exception while self._http_chunk_splits: pos = self._http_chunk_splits.pop(0) if pos == self._cursor: return (b"", True) if pos > self._cursor: return (self._read_nowait(pos - self._cursor), True) internal_logger.warning( "Skipping HTTP chunk end due to data " "consumption beyond chunk boundary" ) if self._buffer: return (self._read_nowait_chunk(-1), False) # return (self._read_nowait(-1), False) if self._eof: # Special case for signifying EOF. # (b'', True) is not a final return value actually. return (b"", False) await self._wait("readchunk") async def readexactly(self, n: int) -> bytes: if self._exception is not None: raise self._exception blocks: List[bytes] = [] while n > 0: block = await self.read(n) if not block: partial = b"".join(blocks) raise asyncio.IncompleteReadError(partial, len(partial) + n) blocks.append(block) n -= len(block) return b"".join(blocks) def read_nowait(self, n: int = -1) -> bytes: # default was changed to be consistent with .read(-1) # # I believe the most users don't know about the method and # they are not affected. if self._exception is not None: raise self._exception if self._waiter and not self._waiter.done(): raise RuntimeError( "Called while some coroutine is waiting for incoming data." ) return self._read_nowait(n) def _read_nowait_chunk(self, n: int) -> bytes: first_buffer = self._buffer[0] offset = self._buffer_offset if n != -1 and len(first_buffer) - offset > n: data = first_buffer[offset : offset + n] self._buffer_offset += n elif offset: self._buffer.popleft() data = first_buffer[offset:] self._buffer_offset = 0 else: data = self._buffer.popleft() self._size -= len(data) self._cursor += len(data) chunk_splits = self._http_chunk_splits # Prevent memory leak: drop useless chunk splits while chunk_splits and chunk_splits[0] < self._cursor: chunk_splits.pop(0) if self._size < self._low_water and self._protocol._reading_paused: self._protocol.resume_reading() return data def _read_nowait(self, n: int) -> bytes: """Read not more than n bytes, or whole buffer if n == -1""" self._timer.assert_timeout() chunks = [] while self._buffer: chunk = self._read_nowait_chunk(n) chunks.append(chunk) if n != -1: n -= len(chunk) if n == 0: break return b"".join(chunks) if chunks else b"" class EmptyStreamReader(StreamReader): # lgtm [py/missing-call-to-init] def __init__(self) -> None: self._read_eof_chunk = False def __repr__(self) -> str: return "<%s>" % self.__class__.__name__ def exception(self) -> Optional[BaseException]: return None def set_exception(self, exc: BaseException) -> None: pass def on_eof(self, callback: Callable[[], None]) -> None: try: callback() except Exception: internal_logger.exception("Exception in eof callback") def feed_eof(self) -> None: pass def is_eof(self) -> bool: return True def at_eof(self) -> bool: return True async def wait_eof(self) -> None: return def feed_data(self, data: bytes, n: int = 0) -> None: pass async def readline(self) -> bytes: return b"" async def read(self, n: int = -1) -> bytes: return b"" # TODO add async def readuntil async def readany(self) -> bytes: return b"" async def readchunk(self) -> Tuple[bytes, bool]: if not self._read_eof_chunk: self._read_eof_chunk = True return (b"", False) return (b"", True) async def readexactly(self, n: int) -> bytes: raise asyncio.IncompleteReadError(b"", n) def read_nowait(self, n: int = -1) -> bytes: return b"" EMPTY_PAYLOAD: Final[StreamReader] = EmptyStreamReader() class DataQueue(Generic[_T]): """DataQueue is a general-purpose blocking queue with one reader.""" def __init__(self, loop: asyncio.AbstractEventLoop) -> None: self._loop = loop self._eof = False self._waiter: Optional[asyncio.Future[None]] = None self._exception: Optional[BaseException] = None self._size = 0 self._buffer: Deque[Tuple[_T, int]] = collections.deque() def __len__(self) -> int: return len(self._buffer) def is_eof(self) -> bool: return self._eof def at_eof(self) -> bool: return self._eof and not self._buffer def exception(self) -> Optional[BaseException]: return self._exception def set_exception(self, exc: BaseException) -> None: self._eof = True self._exception = exc waiter = self._waiter if waiter is not None: self._waiter = None set_exception(waiter, exc) def feed_data(self, data: _T, size: int = 0) -> None: self._size += size self._buffer.append((data, size)) waiter = self._waiter if waiter is not None: self._waiter = None set_result(waiter, None) def feed_eof(self) -> None: self._eof = True waiter = self._waiter if waiter is not None: self._waiter = None set_result(waiter, None) async def read(self) -> _T: if not self._buffer and not self._eof: assert not self._waiter self._waiter = self._loop.create_future() try: await self._waiter except (asyncio.CancelledError, asyncio.TimeoutError): self._waiter = None raise if self._buffer: data, size = self._buffer.popleft() self._size -= size return data else: if self._exception is not None: raise self._exception else: raise EofStream def __aiter__(self) -> AsyncStreamIterator[_T]: return AsyncStreamIterator(self.read) class FlowControlDataQueue(DataQueue[_T]): """FlowControlDataQueue resumes and pauses an underlying stream. It is a destination for parsed data. """ def __init__( self, protocol: BaseProtocol, limit: int, *, loop: asyncio.AbstractEventLoop ) -> None: super().__init__(loop=loop) self._protocol = protocol self._limit = limit * 2 def feed_data(self, data: _T, size: int = 0) -> None: super().feed_data(data, size) if self._size > self._limit and not self._protocol._reading_paused: self._protocol.pause_reading() async def read(self) -> _T: try: return await super().read() finally: if self._size < self._limit and self._protocol._reading_paused: self._protocol.resume_reading()
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