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from __future__ import annotations
import warnings
import json
import asyncio
from functools import partialmethod
from asyncio import Future, Queue
from typing import AsyncGenerator
from curl_cffi.requests import AsyncSession, Response
import curl_cffi
is_newer_0_5_8: bool = hasattr(AsyncSession, "_set_cookies") or hasattr(curl_cffi.requests.Cookies, "get_cookies_for_curl")
is_newer_0_5_9: bool = hasattr(curl_cffi.AsyncCurl, "remove_handle")
is_newer_0_5_10: bool = hasattr(AsyncSession, "release_curl")
class StreamResponse:
def __init__(self, inner: Response, queue: Queue[bytes]) -> None:
self.inner: Response = inner
self.queue: Queue[bytes] = queue
self.request = inner.request
self.status_code: int = inner.status_code
self.reason: str = inner.reason
self.ok: bool = inner.ok
self.headers = inner.headers
self.cookies = inner.cookies
async def text(self) -> str:
content: bytes = await self.read()
return content.decode()
def raise_for_status(self) -> None:
if not self.ok:
raise RuntimeError(f"HTTP Error {self.status_code}: {self.reason}")
async def json(self, **kwargs) -> dict:
return json.loads(await self.read(), **kwargs)
async def iter_lines(self, chunk_size=None, decode_unicode=False, delimiter=None) -> AsyncGenerator[bytes, None]:
pending: bytes = None
async for chunk in self.iter_content(
chunk_size=chunk_size, decode_unicode=decode_unicode
):
if pending is not None:
chunk = pending + chunk
if delimiter:
lines = chunk.split(delimiter)
else:
lines = chunk.splitlines()
if lines and lines[-1] and chunk and lines[-1][-1] == chunk[-1]:
pending = lines.pop()
else:
pending = None
for line in lines:
yield line
if pending is not None:
yield pending
async def iter_content(self, chunk_size=None, decode_unicode=False) -> AsyncGenerator[bytes, None]:
if chunk_size:
warnings.warn("chunk_size is ignored, there is no way to tell curl that.")
if decode_unicode:
raise NotImplementedError()
while True:
chunk = await self.queue.get()
if chunk is None:
return
yield chunk
async def read(self) -> bytes:
return b"".join([chunk async for chunk in self.iter_content()])
class StreamRequest:
def __init__(self, session: AsyncSession, method: str, url: str, **kwargs) -> None:
self.session: AsyncSession = session
self.loop: asyncio.AbstractEventLoop = session.loop if session.loop else asyncio.get_running_loop()
self.queue: Queue[bytes] = Queue()
self.method: str = method
self.url: str = url
self.options: dict = kwargs
self.handle: curl_cffi.AsyncCurl = None
def _on_content(self, data: bytes) -> None:
if not self.enter.done():
self.enter.set_result(None)
self.queue.put_nowait(data)
def _on_done(self, task: Future) -> None:
if not self.enter.done():
self.enter.set_result(None)
self.queue.put_nowait(None)
self.loop.call_soon(self.release_curl)
async def fetch(self) -> StreamResponse:
if self.handle:
raise RuntimeError("Request already started")
self.curl: curl_cffi.AsyncCurl = await self.session.pop_curl()
self.enter: asyncio.Future = self.loop.create_future()
if is_newer_0_5_10:
request, _, header_buffer, _, _ = self.session._set_curl_options(
self.curl,
self.method,
self.url,
content_callback=self._on_content,
**self.options
)
else:
request, _, header_buffer = self.session._set_curl_options(
self.curl,
self.method,
self.url,
content_callback=self._on_content,
**self.options
)
if is_newer_0_5_9:
self.handle = self.session.acurl.add_handle(self.curl)
else:
await self.session.acurl.add_handle(self.curl, False)
self.handle = self.session.acurl._curl2future[self.curl]
self.handle.add_done_callback(self._on_done)
# Wait for headers
await self.enter
# Raise exceptions
if self.handle.done():
self.handle.result()
if is_newer_0_5_8:
response = self.session._parse_response(self.curl, _, header_buffer)
response.request = request
else:
response = self.session._parse_response(self.curl, request, _, header_buffer)
return StreamResponse(
response,
self.queue
)
async def __aenter__(self) -> StreamResponse:
return await self.fetch()
async def __aexit__(self, *args) -> None:
self.release_curl()
def release_curl(self) -> None:
if is_newer_0_5_10:
self.session.release_curl(self.curl)
return
if not self.curl:
return
self.curl.clean_after_perform()
if is_newer_0_5_9:
self.session.acurl.remove_handle(self.curl)
elif not self.handle.done() and not self.handle.cancelled():
self.session.acurl.set_result(self.curl)
self.curl.reset()
self.session.push_curl(self.curl)
self.curl = None
class StreamSession(AsyncSession):
def request(
self,
method: str,
url: str,
**kwargs
) -> StreamRequest:
return StreamRequest(self, method, url, **kwargs)
head = partialmethod(request, "HEAD")
get = partialmethod(request, "GET")
post = partialmethod(request, "POST")
put = partialmethod(request, "PUT")
patch = partialmethod(request, "PATCH")
delete = partialmethod(request, "DELETE")
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