mirror of
https://github.com/searxng/searxng.git
synced 2024-12-26 19:20:29 +00:00
266 lines
8.1 KiB
Python
266 lines
8.1 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
# lint: pylint
|
|
# pylint: disable=missing-module-docstring, global-statement
|
|
|
|
import asyncio
|
|
import threading
|
|
import concurrent.futures
|
|
from queue import SimpleQueue
|
|
from types import MethodType
|
|
from timeit import default_timer
|
|
from typing import Iterable, NamedTuple, Tuple, List, Dict, Union
|
|
from contextlib import contextmanager
|
|
|
|
import httpx
|
|
import anyio
|
|
|
|
from .network import get_network, initialize, check_network_configuration # pylint:disable=cyclic-import
|
|
from .client import get_loop
|
|
from .raise_for_httperror import raise_for_httperror
|
|
|
|
|
|
THREADLOCAL = threading.local()
|
|
"""Thread-local data is data for thread specific values."""
|
|
|
|
|
|
def reset_time_for_thread():
|
|
THREADLOCAL.total_time = 0
|
|
|
|
|
|
def get_time_for_thread():
|
|
"""returns thread's total time or None"""
|
|
return THREADLOCAL.__dict__.get('total_time')
|
|
|
|
|
|
def set_timeout_for_thread(timeout, start_time=None):
|
|
THREADLOCAL.timeout = timeout
|
|
THREADLOCAL.start_time = start_time
|
|
|
|
|
|
def set_context_network_name(network_name):
|
|
THREADLOCAL.network = get_network(network_name)
|
|
|
|
|
|
def get_context_network():
|
|
"""If set return thread's network.
|
|
|
|
If unset, return value from :py:obj:`get_network`.
|
|
"""
|
|
return THREADLOCAL.__dict__.get('network') or get_network()
|
|
|
|
|
|
@contextmanager
|
|
def _record_http_time():
|
|
# pylint: disable=too-many-branches
|
|
time_before_request = default_timer()
|
|
start_time = getattr(THREADLOCAL, 'start_time', time_before_request)
|
|
try:
|
|
yield start_time
|
|
finally:
|
|
# update total_time.
|
|
# See get_time_for_thread() and reset_time_for_thread()
|
|
if hasattr(THREADLOCAL, 'total_time'):
|
|
time_after_request = default_timer()
|
|
THREADLOCAL.total_time += time_after_request - time_before_request
|
|
|
|
|
|
def _get_timeout(start_time, kwargs):
|
|
# pylint: disable=too-many-branches
|
|
|
|
# timeout (httpx)
|
|
if 'timeout' in kwargs:
|
|
timeout = kwargs['timeout']
|
|
else:
|
|
timeout = getattr(THREADLOCAL, 'timeout', None)
|
|
if timeout is not None:
|
|
kwargs['timeout'] = timeout
|
|
|
|
# 2 minutes timeout for the requests without timeout
|
|
timeout = timeout or 120
|
|
|
|
# ajdust actual timeout
|
|
timeout += 0.2 # overhead
|
|
if start_time:
|
|
timeout -= default_timer() - start_time
|
|
|
|
return timeout
|
|
|
|
|
|
def request(method, url, **kwargs):
|
|
"""same as requests/requests/api.py request(...)"""
|
|
with _record_http_time() as start_time:
|
|
network = get_context_network()
|
|
timeout = _get_timeout(start_time, kwargs)
|
|
future = asyncio.run_coroutine_threadsafe(network.request(method, url, **kwargs), get_loop())
|
|
try:
|
|
return future.result(timeout)
|
|
except concurrent.futures.TimeoutError as e:
|
|
raise httpx.TimeoutException('Timeout', request=None) from e
|
|
|
|
|
|
def multi_requests(request_list: List["Request"]) -> List[Union[httpx.Response, Exception]]:
|
|
"""send multiple HTTP requests in parallel. Wait for all requests to finish."""
|
|
with _record_http_time() as start_time:
|
|
# send the requests
|
|
network = get_context_network()
|
|
loop = get_loop()
|
|
future_list = []
|
|
for request_desc in request_list:
|
|
timeout = _get_timeout(start_time, request_desc.kwargs)
|
|
future = asyncio.run_coroutine_threadsafe(
|
|
network.request(request_desc.method, request_desc.url, **request_desc.kwargs), loop
|
|
)
|
|
future_list.append((future, timeout))
|
|
|
|
# read the responses
|
|
responses = []
|
|
for future, timeout in future_list:
|
|
try:
|
|
responses.append(future.result(timeout))
|
|
except concurrent.futures.TimeoutError:
|
|
responses.append(httpx.TimeoutException('Timeout', request=None))
|
|
except Exception as e: # pylint: disable=broad-except
|
|
responses.append(e)
|
|
return responses
|
|
|
|
|
|
class Request(NamedTuple):
|
|
"""Request description for the multi_requests function"""
|
|
|
|
method: str
|
|
url: str
|
|
kwargs: Dict[str, str] = {}
|
|
|
|
@staticmethod
|
|
def get(url, **kwargs):
|
|
return Request('GET', url, kwargs)
|
|
|
|
@staticmethod
|
|
def options(url, **kwargs):
|
|
return Request('OPTIONS', url, kwargs)
|
|
|
|
@staticmethod
|
|
def head(url, **kwargs):
|
|
return Request('HEAD', url, kwargs)
|
|
|
|
@staticmethod
|
|
def post(url, **kwargs):
|
|
return Request('POST', url, kwargs)
|
|
|
|
@staticmethod
|
|
def put(url, **kwargs):
|
|
return Request('PUT', url, kwargs)
|
|
|
|
@staticmethod
|
|
def patch(url, **kwargs):
|
|
return Request('PATCH', url, kwargs)
|
|
|
|
@staticmethod
|
|
def delete(url, **kwargs):
|
|
return Request('DELETE', url, kwargs)
|
|
|
|
|
|
def get(url, **kwargs):
|
|
kwargs.setdefault('allow_redirects', True)
|
|
return request('get', url, **kwargs)
|
|
|
|
|
|
def options(url, **kwargs):
|
|
kwargs.setdefault('allow_redirects', True)
|
|
return request('options', url, **kwargs)
|
|
|
|
|
|
def head(url, **kwargs):
|
|
kwargs.setdefault('allow_redirects', False)
|
|
return request('head', url, **kwargs)
|
|
|
|
|
|
def post(url, data=None, **kwargs):
|
|
return request('post', url, data=data, **kwargs)
|
|
|
|
|
|
def put(url, data=None, **kwargs):
|
|
return request('put', url, data=data, **kwargs)
|
|
|
|
|
|
def patch(url, data=None, **kwargs):
|
|
return request('patch', url, data=data, **kwargs)
|
|
|
|
|
|
def delete(url, **kwargs):
|
|
return request('delete', url, **kwargs)
|
|
|
|
|
|
async def stream_chunk_to_queue(network, queue, method, url, **kwargs):
|
|
try:
|
|
async with await network.stream(method, url, **kwargs) as response:
|
|
queue.put(response)
|
|
# aiter_raw: access the raw bytes on the response without applying any HTTP content decoding
|
|
# https://www.python-httpx.org/quickstart/#streaming-responses
|
|
async for chunk in response.aiter_raw(65536):
|
|
if len(chunk) > 0:
|
|
queue.put(chunk)
|
|
except (httpx.StreamClosed, anyio.ClosedResourceError):
|
|
# the response was queued before the exception.
|
|
# the exception was raised on aiter_raw.
|
|
# we do nothing here: in the finally block, None will be queued
|
|
# so stream(method, url, **kwargs) generator can stop
|
|
pass
|
|
except Exception as e: # pylint: disable=broad-except
|
|
# broad except to avoid this scenario:
|
|
# exception in network.stream(method, url, **kwargs)
|
|
# -> the exception is not catch here
|
|
# -> queue None (in finally)
|
|
# -> the function below steam(method, url, **kwargs) has nothing to return
|
|
queue.put(e)
|
|
finally:
|
|
queue.put(None)
|
|
|
|
|
|
def _stream_generator(method, url, **kwargs):
|
|
queue = SimpleQueue()
|
|
network = get_context_network()
|
|
future = asyncio.run_coroutine_threadsafe(stream_chunk_to_queue(network, queue, method, url, **kwargs), get_loop())
|
|
|
|
# yield chunks
|
|
obj_or_exception = queue.get()
|
|
while obj_or_exception is not None:
|
|
if isinstance(obj_or_exception, Exception):
|
|
raise obj_or_exception
|
|
yield obj_or_exception
|
|
obj_or_exception = queue.get()
|
|
future.result()
|
|
|
|
|
|
def _close_response_method(self):
|
|
asyncio.run_coroutine_threadsafe(self.aclose(), get_loop())
|
|
# reach the end of _self.generator ( _stream_generator ) to an avoid memory leak.
|
|
# it makes sure that :
|
|
# * the httpx response is closed (see the stream_chunk_to_queue function)
|
|
# * to call future.result() in _stream_generator
|
|
for _ in self._generator: # pylint: disable=protected-access
|
|
continue
|
|
|
|
|
|
def stream(method, url, **kwargs) -> Tuple[httpx.Response, Iterable[bytes]]:
|
|
"""Replace httpx.stream.
|
|
|
|
Usage:
|
|
response, stream = poolrequests.stream(...)
|
|
for chunk in stream:
|
|
...
|
|
|
|
httpx.Client.stream requires to write the httpx.HTTPTransport version of the
|
|
the httpx.AsyncHTTPTransport declared above.
|
|
"""
|
|
generator = _stream_generator(method, url, **kwargs)
|
|
|
|
# yield response
|
|
response = next(generator) # pylint: disable=stop-iteration-return
|
|
if isinstance(response, Exception):
|
|
raise response
|
|
|
|
response._generator = generator # pylint: disable=protected-access
|
|
response.close = MethodType(_close_response_method, response)
|
|
|
|
return response, generator
|