Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/aiohttp/payload_streamer.py: 66%

1""" 

2Payload implementation for coroutines as data provider. 

3 

4As a simple case, you can upload data from file:: 

5 

6 @aiohttp.streamer 

7 async def file_sender(writer, file_name=None): 

8 with open(file_name, 'rb') as f: 

9 chunk = f.read(2**16) 

10 while chunk: 

11 await writer.write(chunk) 

12 

13 chunk = f.read(2**16) 

14 

15Then you can use `file_sender` like this: 

16 

17 async with session.post('http://httpbin.org/post', 

18 data=file_sender(file_name='huge_file')) as resp: 

19 print(await resp.text()) 

20 

21..note:: Coroutine must accept `writer` as first argument 

22 

23""" 

24 

25import types 

26import warnings 

27from typing import Any, Awaitable, Callable, Dict, Tuple 

28 

29from .abc import AbstractStreamWriter 

30from .payload import Payload, payload_type 

31 

32__all__ = ("streamer",) 

33 

34 

35class _stream_wrapper: 

36 def __init__( 

37 self, 

38 coro: Callable[..., Awaitable[None]], 

39 args: Tuple[Any, ...], 

40 kwargs: Dict[str, Any], 

41 ) -> None: 

42 self.coro = types.coroutine(coro) 

43 self.args = args 

44 self.kwargs = kwargs 

45 

46 async def __call__(self, writer: AbstractStreamWriter) -> None: 

47 await self.coro(writer, *self.args, **self.kwargs) 

48 

49 

50class streamer: 

51 def __init__(self, coro: Callable[..., Awaitable[None]]) -> None: 

52 warnings.warn( 

53 "@streamer is deprecated, use async generators instead", 

54 DeprecationWarning, 

55 stacklevel=2, 

56 ) 

57 self.coro = coro 

58 

59 def __call__(self, *args: Any, **kwargs: Any) -> _stream_wrapper: 

60 return _stream_wrapper(self.coro, args, kwargs) 

61 

62 

63@payload_type(_stream_wrapper) 

64class StreamWrapperPayload(Payload): 

65 async def write(self, writer: AbstractStreamWriter) -> None: 

66 await self._value(writer) 

67 

68 

69@payload_type(streamer) 

70class StreamPayload(StreamWrapperPayload): 

71 def __init__(self, value: Any, *args: Any, **kwargs: Any) -> None: 

72 super().__init__(value(), *args, **kwargs) 

73 

74 async def write(self, writer: AbstractStreamWriter) -> None: 

75 await self._value(writer)