forked from zaclys/searxng
267 lines
8.1 KiB
Python
267 lines
8.1 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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# pylint: disable=missing-module-docstring, global-statement
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import asyncio
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import threading
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import concurrent.futures
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from queue import SimpleQueue
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from types import MethodType
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from timeit import default_timer
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from typing import Iterable, NamedTuple, Tuple, List, Dict, Union
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from contextlib import contextmanager
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import httpx
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import anyio
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from .network import get_network, initialize, check_network_configuration # pylint:disable=cyclic-import
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from .client import get_loop
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from .raise_for_httperror import raise_for_httperror
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THREADLOCAL = threading.local()
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"""Thread-local data is data for thread specific values."""
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def reset_time_for_thread():
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THREADLOCAL.total_time = 0
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def get_time_for_thread():
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"""returns thread's total time or None"""
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return THREADLOCAL.__dict__.get('total_time')
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def set_timeout_for_thread(timeout, start_time=None):
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THREADLOCAL.timeout = timeout
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THREADLOCAL.start_time = start_time
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def set_context_network_name(network_name):
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THREADLOCAL.network = get_network(network_name)
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def get_context_network():
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"""If set return thread's network.
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If unset, return value from :py:obj:`get_network`.
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"""
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return THREADLOCAL.__dict__.get('network') or get_network()
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@contextmanager
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def _record_http_time():
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# pylint: disable=too-many-branches
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time_before_request = default_timer()
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start_time = getattr(THREADLOCAL, 'start_time', time_before_request)
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try:
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yield start_time
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finally:
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# update total_time.
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# See get_time_for_thread() and reset_time_for_thread()
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if hasattr(THREADLOCAL, 'total_time'):
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time_after_request = default_timer()
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THREADLOCAL.total_time += time_after_request - time_before_request
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def _get_timeout(start_time, kwargs):
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# pylint: disable=too-many-branches
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# timeout (httpx)
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if 'timeout' in kwargs:
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timeout = kwargs['timeout']
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else:
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timeout = getattr(THREADLOCAL, 'timeout', None)
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if timeout is not None:
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kwargs['timeout'] = timeout
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# 2 minutes timeout for the requests without timeout
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timeout = timeout or 120
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# ajdust actual timeout
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timeout += 0.2 # overhead
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if start_time:
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timeout -= default_timer() - start_time
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return timeout
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def request(method, url, **kwargs):
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"""same as requests/requests/api.py request(...)"""
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with _record_http_time() as start_time:
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network = get_context_network()
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timeout = _get_timeout(start_time, kwargs)
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future = asyncio.run_coroutine_threadsafe(network.request(method, url, **kwargs), get_loop())
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try:
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return future.result(timeout)
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except concurrent.futures.TimeoutError as e:
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raise httpx.TimeoutException('Timeout', request=None) from e
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def multi_requests(request_list: List["Request"]) -> List[Union[httpx.Response, Exception]]:
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"""send multiple HTTP requests in parallel. Wait for all requests to finish."""
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with _record_http_time() as start_time:
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# send the requests
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network = get_context_network()
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loop = get_loop()
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future_list = []
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for request_desc in request_list:
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timeout = _get_timeout(start_time, request_desc.kwargs)
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future = asyncio.run_coroutine_threadsafe(
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network.request(request_desc.method, request_desc.url, **request_desc.kwargs), loop
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)
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future_list.append((future, timeout))
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# read the responses
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responses = []
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for future, timeout in future_list:
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try:
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responses.append(future.result(timeout))
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except concurrent.futures.TimeoutError:
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responses.append(httpx.TimeoutException('Timeout', request=None))
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except Exception as e: # pylint: disable=broad-except
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responses.append(e)
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return responses
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class Request(NamedTuple):
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"""Request description for the multi_requests function"""
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method: str
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url: str
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kwargs: Dict[str, str] = {}
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@staticmethod
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def get(url, **kwargs):
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return Request('GET', url, kwargs)
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@staticmethod
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def options(url, **kwargs):
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return Request('OPTIONS', url, kwargs)
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@staticmethod
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def head(url, **kwargs):
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return Request('HEAD', url, kwargs)
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@staticmethod
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def post(url, **kwargs):
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return Request('POST', url, kwargs)
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@staticmethod
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def put(url, **kwargs):
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return Request('PUT', url, kwargs)
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@staticmethod
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def patch(url, **kwargs):
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return Request('PATCH', url, kwargs)
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@staticmethod
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def delete(url, **kwargs):
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return Request('DELETE', url, kwargs)
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def get(url, **kwargs):
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kwargs.setdefault('allow_redirects', True)
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return request('get', url, **kwargs)
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def options(url, **kwargs):
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kwargs.setdefault('allow_redirects', True)
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return request('options', url, **kwargs)
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def head(url, **kwargs):
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kwargs.setdefault('allow_redirects', False)
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return request('head', url, **kwargs)
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def post(url, data=None, **kwargs):
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return request('post', url, data=data, **kwargs)
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def put(url, data=None, **kwargs):
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return request('put', url, data=data, **kwargs)
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def patch(url, data=None, **kwargs):
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return request('patch', url, data=data, **kwargs)
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def delete(url, **kwargs):
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return request('delete', url, **kwargs)
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async def stream_chunk_to_queue(network, queue, method, url, **kwargs):
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try:
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async with await network.stream(method, url, **kwargs) as response:
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queue.put(response)
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# aiter_raw: access the raw bytes on the response without applying any HTTP content decoding
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# https://www.python-httpx.org/quickstart/#streaming-responses
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async for chunk in response.aiter_raw(65536):
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if len(chunk) > 0:
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queue.put(chunk)
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except (httpx.StreamClosed, anyio.ClosedResourceError):
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# the response was queued before the exception.
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# the exception was raised on aiter_raw.
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# we do nothing here: in the finally block, None will be queued
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# so stream(method, url, **kwargs) generator can stop
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pass
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except Exception as e: # pylint: disable=broad-except
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# broad except to avoid this scenario:
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# exception in network.stream(method, url, **kwargs)
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# -> the exception is not catch here
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# -> queue None (in finally)
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# -> the function below steam(method, url, **kwargs) has nothing to return
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queue.put(e)
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finally:
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queue.put(None)
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def _stream_generator(method, url, **kwargs):
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queue = SimpleQueue()
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network = get_context_network()
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future = asyncio.run_coroutine_threadsafe(stream_chunk_to_queue(network, queue, method, url, **kwargs), get_loop())
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# yield chunks
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obj_or_exception = queue.get()
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while obj_or_exception is not None:
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if isinstance(obj_or_exception, Exception):
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raise obj_or_exception
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yield obj_or_exception
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obj_or_exception = queue.get()
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future.result()
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def _close_response_method(self):
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asyncio.run_coroutine_threadsafe(self.aclose(), get_loop())
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# reach the end of _self.generator ( _stream_generator ) to an avoid memory leak.
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# it makes sure that :
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# * the httpx response is closed (see the stream_chunk_to_queue function)
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# * to call future.result() in _stream_generator
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for _ in self._generator: # pylint: disable=protected-access
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continue
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def stream(method, url, **kwargs) -> Tuple[httpx.Response, Iterable[bytes]]:
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"""Replace httpx.stream.
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Usage:
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response, stream = poolrequests.stream(...)
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for chunk in stream:
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...
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httpx.Client.stream requires to write the httpx.HTTPTransport version of the
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the httpx.AsyncHTTPTransport declared above.
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"""
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generator = _stream_generator(method, url, **kwargs)
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# yield response
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response = next(generator) # pylint: disable=stop-iteration-return
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if isinstance(response, Exception):
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raise response
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response._generator = generator # pylint: disable=protected-access
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response.close = MethodType(_close_response_method, response)
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return response, generator
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