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Mini Shell
Mini Shell
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,
Final,
Iterable,
Optional,
TextIO,
Tuple,
Type,
Union,
)
from multidict import CIMultiDict
from . import hdrs
from .abc import AbstractStreamWriter
from .helpers import (
_SENTINEL,
content_disposition_header,
guess_filename,
parse_mimetype,
sentinel,
)
from .streams import 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: Final[int] = 2**20 # 1 MB
if TYPE_CHECKING:
from typing import List
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
PayloadType = Type["Payload"]
_PayloadRegistryItem = Tuple[PayloadType, Any]
class PayloadRegistry:
"""Payload registry.
note: we need zope.interface for more efficient adapter search
"""
def __init__(self) -> None:
self._first: List[_PayloadRegistryItem] = []
self._normal: List[_PayloadRegistryItem] = []
self._last: List[_PayloadRegistryItem] = []
def get(
self,
data: Any,
*args: Any,
_CHAIN: "Type[chain[_PayloadRegistryItem]]" = 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: PayloadType, 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(f"Unsupported order {order!r}")
class Payload(ABC):
_default_content_type: str = "application/octet-stream"
_size: Optional[int] = None
def __init__(
self,
value: Any,
headers: Optional[
Union[_CIMultiDict, Dict[str, str], Iterable[Tuple[str, str]]]
] = None,
content_type: Union[str, None, _SENTINEL] = sentinel,
filename: Optional[str] = None,
encoding: Optional[str] = None,
**kwargs: Any,
) -> None:
self._encoding = encoding
self._filename = filename
self._headers: _CIMultiDict = 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,
_charset: str = "utf-8",
**params: Any,
) -> None:
"""Sets ``Content-Disposition`` header."""
self._headers[hdrs.CONTENT_DISPOSITION] = content_disposition_header(
disptype, quote_fields=quote_fields, _charset=_charset, **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(f"value argument must be byte-ish, not {type(value)!r}")
if "content_type" not in kwargs:
kwargs["content_type"] = "application/octet-stream"
super().__init__(value, *args, **kwargs)
if isinstance(value, memoryview):
self._size = value.nbytes
else:
self._size = len(value)
if self._size > TOO_LARGE_BYTES_BODY:
kwargs = {"source": self}
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: str,
*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):
_value: IO[Any]
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, 2**16)
while chunk:
await writer.write(chunk)
chunk = await loop.run_in_executor(None, self._value.read, 2**16)
finally:
await loop.run_in_executor(None, self._value.close)
class TextIOPayload(IOBasePayload):
_value: TextIO
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, 2**16)
while chunk:
data = (
chunk.encode(encoding=self._encoding)
if self._encoding
else chunk.encode()
)
await writer.write(data)
chunk = await loop.run_in_executor(None, self._value.read, 2**16)
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:
from typing import AsyncIterable, AsyncIterator
_AsyncIterator = AsyncIterator[bytes]
_AsyncIterable = AsyncIterable[bytes]
else:
from collections.abc import AsyncIterable, AsyncIterator
_AsyncIterator = AsyncIterator
_AsyncIterable = AsyncIterable
class AsyncIterablePayload(Payload):
_iter: Optional[_AsyncIterator] = None
def __init__(self, value: _AsyncIterable, *args: Any, **kwargs: Any) -> None:
if not isinstance(value, AsyncIterable):
raise TypeError(
"value argument must support "
"collections.abc.AsyncIterable 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)
Zerion Mini Shell 1.0