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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)