mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-30 02:34:18 +01:00
244 lines
8.8 KiB
Python
244 lines
8.8 KiB
Python
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import asyncio
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import mimetypes
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import os
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import pathlib
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import sys
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from typing import ( # noqa
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IO,
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TYPE_CHECKING,
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Any,
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Awaitable,
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Callable,
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List,
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Optional,
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Union,
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cast,
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)
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from . import hdrs
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from .abc import AbstractStreamWriter
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from .typedefs import LooseHeaders
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from .web_exceptions import (
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HTTPNotModified,
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HTTPPartialContent,
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HTTPPreconditionFailed,
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HTTPRequestRangeNotSatisfiable,
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)
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from .web_response import StreamResponse
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__all__ = ("FileResponse",)
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if TYPE_CHECKING: # pragma: no cover
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from .web_request import BaseRequest
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_T_OnChunkSent = Optional[Callable[[bytes], Awaitable[None]]]
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NOSENDFILE = bool(os.environ.get("AIOHTTP_NOSENDFILE"))
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class FileResponse(StreamResponse):
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"""A response object can be used to send files."""
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def __init__(
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self,
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path: Union[str, pathlib.Path],
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chunk_size: int = 256 * 1024,
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status: int = 200,
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reason: Optional[str] = None,
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headers: Optional[LooseHeaders] = None,
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) -> None:
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super().__init__(status=status, reason=reason, headers=headers)
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if isinstance(path, str):
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path = pathlib.Path(path)
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self._path = path
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self._chunk_size = chunk_size
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async def _sendfile_fallback(
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self, writer: AbstractStreamWriter, fobj: IO[Any], offset: int, count: int
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) -> AbstractStreamWriter:
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# To keep memory usage low,fobj is transferred in chunks
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# controlled by the constructor's chunk_size argument.
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chunk_size = self._chunk_size
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loop = asyncio.get_event_loop()
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await loop.run_in_executor(None, fobj.seek, offset)
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chunk = await loop.run_in_executor(None, fobj.read, chunk_size)
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while chunk:
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await writer.write(chunk)
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count = count - chunk_size
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if count <= 0:
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break
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chunk = await loop.run_in_executor(None, fobj.read, min(chunk_size, count))
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await writer.drain()
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return writer
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async def _sendfile(
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self, request: "BaseRequest", fobj: IO[Any], offset: int, count: int
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) -> AbstractStreamWriter:
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writer = await super().prepare(request)
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assert writer is not None
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if NOSENDFILE or sys.version_info < (3, 7) or self.compression:
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return await self._sendfile_fallback(writer, fobj, offset, count)
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loop = request._loop
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transport = request.transport
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assert transport is not None
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try:
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await loop.sendfile(transport, fobj, offset, count)
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except NotImplementedError:
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return await self._sendfile_fallback(writer, fobj, offset, count)
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await super().write_eof()
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return writer
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async def prepare(self, request: "BaseRequest") -> Optional[AbstractStreamWriter]:
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filepath = self._path
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gzip = False
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if "gzip" in request.headers.get(hdrs.ACCEPT_ENCODING, ""):
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gzip_path = filepath.with_name(filepath.name + ".gz")
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if gzip_path.is_file():
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filepath = gzip_path
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gzip = True
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loop = asyncio.get_event_loop()
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st = await loop.run_in_executor(None, filepath.stat)
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modsince = request.if_modified_since
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if modsince is not None and st.st_mtime <= modsince.timestamp():
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self.set_status(HTTPNotModified.status_code)
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self._length_check = False
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# Delete any Content-Length headers provided by user. HTTP 304
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# should always have empty response body
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return await super().prepare(request)
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unmodsince = request.if_unmodified_since
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if unmodsince is not None and st.st_mtime > unmodsince.timestamp():
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self.set_status(HTTPPreconditionFailed.status_code)
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return await super().prepare(request)
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if hdrs.CONTENT_TYPE not in self.headers:
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ct, encoding = mimetypes.guess_type(str(filepath))
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if not ct:
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ct = "application/octet-stream"
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should_set_ct = True
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else:
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encoding = "gzip" if gzip else None
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should_set_ct = False
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status = self._status
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file_size = st.st_size
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count = file_size
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start = None
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ifrange = request.if_range
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if ifrange is None or st.st_mtime <= ifrange.timestamp():
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# If-Range header check:
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# condition = cached date >= last modification date
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# return 206 if True else 200.
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# if False:
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# Range header would not be processed, return 200
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# if True but Range header missing
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# return 200
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try:
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rng = request.http_range
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start = rng.start
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end = rng.stop
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except ValueError:
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# https://tools.ietf.org/html/rfc7233:
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# A server generating a 416 (Range Not Satisfiable) response to
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# a byte-range request SHOULD send a Content-Range header field
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# with an unsatisfied-range value.
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# The complete-length in a 416 response indicates the current
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# length of the selected representation.
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#
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# Will do the same below. Many servers ignore this and do not
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# send a Content-Range header with HTTP 416
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self.headers[hdrs.CONTENT_RANGE] = f"bytes */{file_size}"
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self.set_status(HTTPRequestRangeNotSatisfiable.status_code)
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return await super().prepare(request)
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# If a range request has been made, convert start, end slice
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# notation into file pointer offset and count
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if start is not None or end is not None:
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if start < 0 and end is None: # return tail of file
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start += file_size
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if start < 0:
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# if Range:bytes=-1000 in request header but file size
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# is only 200, there would be trouble without this
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start = 0
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count = file_size - start
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else:
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# rfc7233:If the last-byte-pos value is
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# absent, or if the value is greater than or equal to
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# the current length of the representation data,
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# the byte range is interpreted as the remainder
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# of the representation (i.e., the server replaces the
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# value of last-byte-pos with a value that is one less than
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# the current length of the selected representation).
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count = (
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min(end if end is not None else file_size, file_size) - start
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)
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if start >= file_size:
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# HTTP 416 should be returned in this case.
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#
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# According to https://tools.ietf.org/html/rfc7233:
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# If a valid byte-range-set includes at least one
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# byte-range-spec with a first-byte-pos that is less than
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# the current length of the representation, or at least one
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# suffix-byte-range-spec with a non-zero suffix-length,
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# then the byte-range-set is satisfiable. Otherwise, the
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# byte-range-set is unsatisfiable.
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self.headers[hdrs.CONTENT_RANGE] = f"bytes */{file_size}"
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self.set_status(HTTPRequestRangeNotSatisfiable.status_code)
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return await super().prepare(request)
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status = HTTPPartialContent.status_code
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# Even though you are sending the whole file, you should still
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# return a HTTP 206 for a Range request.
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self.set_status(status)
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if should_set_ct:
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self.content_type = ct # type: ignore
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if encoding:
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self.headers[hdrs.CONTENT_ENCODING] = encoding
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if gzip:
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self.headers[hdrs.VARY] = hdrs.ACCEPT_ENCODING
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self.last_modified = st.st_mtime # type: ignore
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self.content_length = count
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self.headers[hdrs.ACCEPT_RANGES] = "bytes"
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real_start = cast(int, start)
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if status == HTTPPartialContent.status_code:
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self.headers[hdrs.CONTENT_RANGE] = "bytes {}-{}/{}".format(
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real_start, real_start + count - 1, file_size
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)
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if request.method == hdrs.METH_HEAD or self.status in [204, 304]:
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return await super().prepare(request)
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fobj = await loop.run_in_executor(None, filepath.open, "rb")
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if start: # be aware that start could be None or int=0 here.
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offset = start
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else:
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offset = 0
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try:
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return await self._sendfile(request, fobj, offset, count)
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finally:
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await loop.run_in_executor(None, fobj.close)
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