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# ==================================================================================== # |
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# session.py - This file is part of the YFrake package. # |
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# ------------------------------------------------------------------------------------ # |
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# # |
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# MIT License # |
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# # |
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# Copyright (c) 2022 Mattias Aabmets # |
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# # |
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# Permission is hereby granted, free of charge, to any person obtaining a copy # |
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# of this software and associated documentation files (the "Software"), to deal # |
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# in the Software without restriction, including without limitation the rights # |
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # |
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# copies of the Software, and to permit persons to whom the Software is # |
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# furnished to do so, subject to the following conditions: # |
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# # |
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# The above copyright notice and this permission notice shall be included in all # |
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# copies or substantial portions of the Software. # |
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# # |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # |
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # |
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # |
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # |
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # |
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # |
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# SOFTWARE. # |
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# # |
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# ==================================================================================== # |
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from ..config.config import ConfigSingleton |
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from . import base_url |
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from threading import Thread |
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import aiohttp |
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import asyncio |
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import time |
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# ==================================================================================== # |
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class SessionSingleton: |
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""" |
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This class holds a connection to the Yahoo |
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Finance API servers. A session is established |
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by the client 'configure' decorator. There can |
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only be a single session active at any time. |
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""" |
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# ------------------------------------------------------------------------------------ # |
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timeout: aiohttp.ClientTimeout = None |
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session: aiohttp.ClientSession = None |
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connector: aiohttp.TCPConnector = None |
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loop: asyncio.AbstractEventLoop = None |
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thread: Thread = None |
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locked: bool = False |
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__instance__ = None |
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# Singleton pattern |
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# ------------------------------------------------------------------------------------ # |
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def __new__(cls): |
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if not cls.__instance__: |
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cls.__instance__ = super(SessionSingleton, cls).__new__(cls) |
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return cls.__instance__ |
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# ==================================================================================== # |
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def is_locked() -> bool: |
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return SessionSingleton().locked |
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# ------------------------------------------------------------------------------------ # |
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def get_event_loop() -> asyncio.AbstractEventLoop: |
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return SessionSingleton().loop |
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# ------------------------------------------------------------------------------------ # |
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async def open_async() -> None: |
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ss = SessionSingleton() |
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settings = ConfigSingleton().settings['client'] |
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ss.timeout = aiohttp.ClientTimeout(total=settings['timeout']) |
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ss.connector = aiohttp.TCPConnector(limit=settings['limit']) |
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ss.session = aiohttp.ClientSession( |
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connector=ss.connector, |
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timeout=ss.timeout, |
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base_url=base_url, |
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raise_for_status=True |
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) |
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ss.locked = True |
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# ------------------------------------------------------------------------------------ # |
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async def close_async() -> None: |
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ss = SessionSingleton() |
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await ss.session.close() |
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ss.locked = False |
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# ------------------------------------------------------------------------------------ # |
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def open_thread() -> None: |
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ss = SessionSingleton() |
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ss.loop = asyncio.new_event_loop() |
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ss.thread = Thread(target=run_background_thread, daemon=True) |
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ss.thread.start() |
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asyncio_run_threadsafe(open_async(), ss.loop) # blocking |
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# ------------------------------------------------------------------------------------ # |
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def close_thread() -> None: |
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ss = SessionSingleton() |
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asyncio_run_threadsafe(close_async(), ss.loop) # blocking |
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ss.loop.call_soon_threadsafe(ss.loop.stop) |
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force_iter = True |
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while force_iter or ss.loop.is_running(): |
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force_iter = False |
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time.sleep(0) |
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ss.loop.close() |
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ss.thread.join() |
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# ------------------------------------------------------------------------------------ # |
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def asyncio_run_threadsafe(coro, loop) -> None: |
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future = asyncio.run_coroutine_threadsafe(coro, loop) |
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future.result() # blocks until concurrent future is done |
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# ------------------------------------------------------------------------------------ # |
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def run_background_thread() -> None: |
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ss = SessionSingleton() |
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asyncio.set_event_loop(ss.loop) |
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ss.loop.run_forever() |
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aabmets /
yfrake
