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