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75 lines
2.1 KiB
Python
75 lines
2.1 KiB
Python
5 years ago
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""" Payload implemenation for coroutines as data provider.
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As a simple case, you can upload data from file::
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@aiohttp.streamer
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async def file_sender(writer, file_name=None):
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with open(file_name, 'rb') as f:
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chunk = f.read(2**16)
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while chunk:
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await writer.write(chunk)
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chunk = f.read(2**16)
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Then you can use `file_sender` like this:
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async with session.post('http://httpbin.org/post',
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data=file_sender(file_name='huge_file')) as resp:
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print(await resp.text())
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..note:: Coroutine must accept `writer` as first argument
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"""
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import asyncio
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import warnings
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from typing import Any, Awaitable, Callable, Dict, Tuple
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from .abc import AbstractStreamWriter
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from .payload import Payload, payload_type
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__all__ = ('streamer',)
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class _stream_wrapper:
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def __init__(self,
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coro: Callable[..., Awaitable[None]],
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args: Tuple[Any, ...],
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kwargs: Dict[str, Any]) -> None:
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self.coro = asyncio.coroutine(coro)
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self.args = args
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self.kwargs = kwargs
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async def __call__(self, writer: AbstractStreamWriter) -> None:
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await self.coro(writer, *self.args, **self.kwargs)
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class streamer:
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def __init__(self, coro: Callable[..., Awaitable[None]]) -> None:
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warnings.warn("@streamer is deprecated, use async generators instead",
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DeprecationWarning,
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stacklevel=2)
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self.coro = coro
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def __call__(self, *args: Any, **kwargs: Any) -> _stream_wrapper:
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return _stream_wrapper(self.coro, args, kwargs)
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@payload_type(_stream_wrapper)
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class StreamWrapperPayload(Payload):
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async def write(self, writer: AbstractStreamWriter) -> None:
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await self._value(writer)
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@payload_type(streamer)
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class StreamPayload(StreamWrapperPayload):
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def __init__(self, value: Any, *args: Any, **kwargs: Any) -> None:
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super().__init__(value(), *args, **kwargs)
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async def write(self, writer: AbstractStreamWriter) -> None:
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await self._value(writer)
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