tuxbot-bot/venv/lib/python3.7/site-packages/aiohttp/payload.py
2019-12-16 18:12:10 +01:00

456 lines
14 KiB
Python

import asyncio
import enum
import io
import json
import mimetypes
import os
import warnings
from abc import ABC, abstractmethod
from itertools import chain
from typing import (
IO,
TYPE_CHECKING,
Any,
ByteString,
Dict,
Iterable,
Optional,
Text,
TextIO,
Tuple,
Type,
Union,
)
from multidict import CIMultiDict
from . import hdrs
from .abc import AbstractStreamWriter
from .helpers import (
PY_36,
content_disposition_header,
guess_filename,
parse_mimetype,
sentinel,
)
from .streams import DEFAULT_LIMIT, StreamReader
from .typedefs import JSONEncoder, _CIMultiDict
__all__ = ('PAYLOAD_REGISTRY', 'get_payload', 'payload_type', 'Payload',
'BytesPayload', 'StringPayload',
'IOBasePayload', 'BytesIOPayload', 'BufferedReaderPayload',
'TextIOPayload', 'StringIOPayload', 'JsonPayload',
'AsyncIterablePayload')
TOO_LARGE_BYTES_BODY = 2 ** 20 # 1 MB
if TYPE_CHECKING: # pragma: no cover
from typing import List # noqa
class LookupError(Exception):
pass
class Order(str, enum.Enum):
normal = 'normal'
try_first = 'try_first'
try_last = 'try_last'
def get_payload(data: Any, *args: Any, **kwargs: Any) -> 'Payload':
return PAYLOAD_REGISTRY.get(data, *args, **kwargs)
def register_payload(factory: Type['Payload'],
type: Any,
*,
order: Order=Order.normal) -> None:
PAYLOAD_REGISTRY.register(factory, type, order=order)
class payload_type:
def __init__(self, type: Any, *, order: Order=Order.normal) -> None:
self.type = type
self.order = order
def __call__(self, factory: Type['Payload']) -> Type['Payload']:
register_payload(factory, self.type, order=self.order)
return factory
class PayloadRegistry:
"""Payload registry.
note: we need zope.interface for more efficient adapter search
"""
def __init__(self) -> None:
self._first = [] # type: List[Tuple[Type[Payload], Any]]
self._normal = [] # type: List[Tuple[Type[Payload], Any]]
self._last = [] # type: List[Tuple[Type[Payload], Any]]
def get(self,
data: Any,
*args: Any,
_CHAIN: Any=chain,
**kwargs: Any) -> 'Payload':
if isinstance(data, Payload):
return data
for factory, type in _CHAIN(self._first, self._normal, self._last):
if isinstance(data, type):
return factory(data, *args, **kwargs)
raise LookupError()
def register(self,
factory: Type['Payload'],
type: Any,
*,
order: Order=Order.normal) -> None:
if order is Order.try_first:
self._first.append((factory, type))
elif order is Order.normal:
self._normal.append((factory, type))
elif order is Order.try_last:
self._last.append((factory, type))
else:
raise ValueError("Unsupported order {!r}".format(order))
class Payload(ABC):
_default_content_type = 'application/octet-stream' # type: str
_size = None # type: Optional[int]
def __init__(self,
value: Any,
headers: Optional[
Union[
_CIMultiDict,
Dict[str, str],
Iterable[Tuple[str, str]]
]
] = None,
content_type: Optional[str]=sentinel,
filename: Optional[str]=None,
encoding: Optional[str]=None,
**kwargs: Any) -> None:
self._encoding = encoding
self._filename = filename
self._headers = CIMultiDict() # type: _CIMultiDict
self._value = value
if content_type is not sentinel and content_type is not None:
self._headers[hdrs.CONTENT_TYPE] = content_type
elif self._filename is not None:
content_type = mimetypes.guess_type(self._filename)[0]
if content_type is None:
content_type = self._default_content_type
self._headers[hdrs.CONTENT_TYPE] = content_type
else:
self._headers[hdrs.CONTENT_TYPE] = self._default_content_type
self._headers.update(headers or {})
@property
def size(self) -> Optional[int]:
"""Size of the payload."""
return self._size
@property
def filename(self) -> Optional[str]:
"""Filename of the payload."""
return self._filename
@property
def headers(self) -> _CIMultiDict:
"""Custom item headers"""
return self._headers
@property
def _binary_headers(self) -> bytes:
return ''.join(
[k + ': ' + v + '\r\n' for k, v in self.headers.items()]
).encode('utf-8') + b'\r\n'
@property
def encoding(self) -> Optional[str]:
"""Payload encoding"""
return self._encoding
@property
def content_type(self) -> str:
"""Content type"""
return self._headers[hdrs.CONTENT_TYPE]
def set_content_disposition(self,
disptype: str,
quote_fields: bool=True,
**params: Any) -> None:
"""Sets ``Content-Disposition`` header."""
self._headers[hdrs.CONTENT_DISPOSITION] = content_disposition_header(
disptype, quote_fields=quote_fields, **params)
@abstractmethod
async def write(self, writer: AbstractStreamWriter) -> None:
"""Write payload.
writer is an AbstractStreamWriter instance:
"""
class BytesPayload(Payload):
def __init__(self,
value: ByteString,
*args: Any,
**kwargs: Any) -> None:
if not isinstance(value, (bytes, bytearray, memoryview)):
raise TypeError("value argument must be byte-ish, not (!r)"
.format(type(value)))
if 'content_type' not in kwargs:
kwargs['content_type'] = 'application/octet-stream'
super().__init__(value, *args, **kwargs)
self._size = len(value)
if self._size > TOO_LARGE_BYTES_BODY:
if PY_36:
kwargs = {'source': self}
else:
kwargs = {}
warnings.warn("Sending a large body directly with raw bytes might"
" lock the event loop. You should probably pass an "
"io.BytesIO object instead", ResourceWarning,
**kwargs)
async def write(self, writer: AbstractStreamWriter) -> None:
await writer.write(self._value)
class StringPayload(BytesPayload):
def __init__(self,
value: Text,
*args: Any,
encoding: Optional[str]=None,
content_type: Optional[str]=None,
**kwargs: Any) -> None:
if encoding is None:
if content_type is None:
real_encoding = 'utf-8'
content_type = 'text/plain; charset=utf-8'
else:
mimetype = parse_mimetype(content_type)
real_encoding = mimetype.parameters.get('charset', 'utf-8')
else:
if content_type is None:
content_type = 'text/plain; charset=%s' % encoding
real_encoding = encoding
super().__init__(
value.encode(real_encoding),
encoding=real_encoding,
content_type=content_type,
*args,
**kwargs,
)
class StringIOPayload(StringPayload):
def __init__(self,
value: IO[str],
*args: Any,
**kwargs: Any) -> None:
super().__init__(value.read(), *args, **kwargs)
class IOBasePayload(Payload):
def __init__(self,
value: IO[Any],
disposition: str='attachment',
*args: Any,
**kwargs: Any) -> None:
if 'filename' not in kwargs:
kwargs['filename'] = guess_filename(value)
super().__init__(value, *args, **kwargs)
if self._filename is not None and disposition is not None:
if hdrs.CONTENT_DISPOSITION not in self.headers:
self.set_content_disposition(
disposition, filename=self._filename
)
async def write(self, writer: AbstractStreamWriter) -> None:
loop = asyncio.get_event_loop()
try:
chunk = await loop.run_in_executor(
None, self._value.read, DEFAULT_LIMIT
)
while chunk:
await writer.write(chunk)
chunk = await loop.run_in_executor(
None, self._value.read, DEFAULT_LIMIT
)
finally:
await loop.run_in_executor(None, self._value.close)
class TextIOPayload(IOBasePayload):
def __init__(self,
value: TextIO,
*args: Any,
encoding: Optional[str]=None,
content_type: Optional[str]=None,
**kwargs: Any) -> None:
if encoding is None:
if content_type is None:
encoding = 'utf-8'
content_type = 'text/plain; charset=utf-8'
else:
mimetype = parse_mimetype(content_type)
encoding = mimetype.parameters.get('charset', 'utf-8')
else:
if content_type is None:
content_type = 'text/plain; charset=%s' % encoding
super().__init__(
value,
content_type=content_type,
encoding=encoding,
*args,
**kwargs,
)
@property
def size(self) -> Optional[int]:
try:
return os.fstat(self._value.fileno()).st_size - self._value.tell()
except OSError:
return None
async def write(self, writer: AbstractStreamWriter) -> None:
loop = asyncio.get_event_loop()
try:
chunk = await loop.run_in_executor(
None, self._value.read, DEFAULT_LIMIT
)
while chunk:
await writer.write(chunk.encode(self._encoding))
chunk = await loop.run_in_executor(
None, self._value.read, DEFAULT_LIMIT
)
finally:
await loop.run_in_executor(None, self._value.close)
class BytesIOPayload(IOBasePayload):
@property
def size(self) -> int:
position = self._value.tell()
end = self._value.seek(0, os.SEEK_END)
self._value.seek(position)
return end - position
class BufferedReaderPayload(IOBasePayload):
@property
def size(self) -> Optional[int]:
try:
return os.fstat(self._value.fileno()).st_size - self._value.tell()
except OSError:
# data.fileno() is not supported, e.g.
# io.BufferedReader(io.BytesIO(b'data'))
return None
class JsonPayload(BytesPayload):
def __init__(self,
value: Any,
encoding: str='utf-8',
content_type: str='application/json',
dumps: JSONEncoder=json.dumps,
*args: Any,
**kwargs: Any) -> None:
super().__init__(
dumps(value).encode(encoding),
content_type=content_type, encoding=encoding, *args, **kwargs)
if TYPE_CHECKING: # pragma: no cover
from typing import AsyncIterator, AsyncIterable
_AsyncIterator = AsyncIterator[bytes]
_AsyncIterable = AsyncIterable[bytes]
else:
from collections.abc import AsyncIterable, AsyncIterator
_AsyncIterator = AsyncIterator
_AsyncIterable = AsyncIterable
class AsyncIterablePayload(Payload):
_iter = None # type: Optional[_AsyncIterator]
def __init__(self,
value: _AsyncIterable,
*args: Any,
**kwargs: Any) -> None:
if not isinstance(value, AsyncIterable):
raise TypeError("value argument must support "
"collections.abc.AsyncIterablebe interface, "
"got {!r}".format(type(value)))
if 'content_type' not in kwargs:
kwargs['content_type'] = 'application/octet-stream'
super().__init__(value, *args, **kwargs)
self._iter = value.__aiter__()
async def write(self, writer: AbstractStreamWriter) -> None:
if self._iter:
try:
# iter is not None check prevents rare cases
# when the case iterable is used twice
while True:
chunk = await self._iter.__anext__()
await writer.write(chunk)
except StopAsyncIteration:
self._iter = None
class StreamReaderPayload(AsyncIterablePayload):
def __init__(self, value: StreamReader, *args: Any, **kwargs: Any) -> None:
super().__init__(value.iter_any(), *args, **kwargs)
PAYLOAD_REGISTRY = PayloadRegistry()
PAYLOAD_REGISTRY.register(BytesPayload, (bytes, bytearray, memoryview))
PAYLOAD_REGISTRY.register(StringPayload, str)
PAYLOAD_REGISTRY.register(StringIOPayload, io.StringIO)
PAYLOAD_REGISTRY.register(TextIOPayload, io.TextIOBase)
PAYLOAD_REGISTRY.register(BytesIOPayload, io.BytesIO)
PAYLOAD_REGISTRY.register(
BufferedReaderPayload, (io.BufferedReader, io.BufferedRandom))
PAYLOAD_REGISTRY.register(IOBasePayload, io.IOBase)
PAYLOAD_REGISTRY.register(StreamReaderPayload, StreamReader)
# try_last for giving a chance to more specialized async interables like
# multidict.BodyPartReaderPayload override the default
PAYLOAD_REGISTRY.register(AsyncIterablePayload, AsyncIterable,
order=Order.try_last)