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[英]Running Two asyncio Coroutines, Each in its own Python Process
[英]Python3 asyncio - running two servers in own thread
我有從BaseServer
繼承的服務器類:
class BaseServer(object):
def __init__(self, host, port):
self.loop = asyncio.new_event_loop()
asyncio.set_event_loop(self.loop)
self.instance = asyncio.start_server(self.handle_connection, host = host, port = port)
async def handle_connection(self, reader: StreamReader, writer: StreamWriter):
pass
def start(self):
# wrapping coroutine into ensure_future to allow it to call from call_soon
# wrapping into lambda to make it callable
callback = asyncio.ensure_future(self.instance)
self.loop.call_soon(lambda: callback)
self.loop.run_forever()
self.loop.close()
def stop(self):
self.loop.call_soon_threadsafe(self.loop.stop)
@staticmethod
def get_instance():
return BaseServer(None, None)
我需要在自己的線程中運行的兩個服務器來並行處理請求。 但是,當我嘗試根據需要運行它們時,只有第一台服務器正在運行。 下面是我的運行方式:
if __name__ == '__main__':
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
async def run():
pool = ThreadPoolExecutor(max_workers=cpu_count())
await loop.run_in_executor(pool, Server1.get_instance().start)
await loop.run_in_executor(pool, Server2.get_instance().start)
loop.run_until_complete(run())
asyncio.set_event_loop
從調用def __init__
我得到了一個錯誤: RuntimeError:線程“ Thread-1”中沒有當前事件循環。
但是,如果我從def __init__
刪除asyncio.set_event_loop
並將其移至def start
錯誤將消失。 為什么會這樣?
跟進OP的評論:
但是在同一個循環中通過run_until_complete運行兩個服務器,其中一個服務器處理對另一個服務器的請求,不是嗎? 如何正確運行兩台服務器?
這是python 3.5的asyncio文檔中TCP服務器示例的修改版本:
# Start server 1
coro1 = asyncio.start_server(handle_echo, '127.0.0.1', 8888, loop=loop)
server1 = loop.run_until_complete(coro1)
print('Serving 1 on {}'.format(server1.sockets[0].getsockname()))
# Start server 2
coro2 = asyncio.start_server(handle_echo, '127.0.0.1', 8889, loop=loop)
server2 = loop.run_until_complete(coro2)
print('Serving 2 on {}'.format(server2.sockets[0].getsockname()))
# Serve requests until Ctrl+C is pressed
try:
loop.run_forever()
except KeyboardInterrupt:
pass
# Close the servers
server1.close()
loop.run_until_complete(server1.wait_closed())
server2.close()
loop.run_until_complete(server2.wait_closed())
# Close the loop
loop.close()
請注意,使用python 3.7對asyncio的添加,它看起來會更好 :
async def main():
server1 = await asyncio.start_server(
handle_echo, '127.0.0.1', 8888)
addr1 = server1.sockets[0].getsockname()
print(f'Serving 1 on {addr1}')
server2 = await asyncio.start_server(
handle_echo, '127.0.0.1', 8889)
addr2 = server2.sockets[0].getsockname()
print(f'Serving 2 on {addr2}')
async with server1, server2:
await asyncio.gather(
server1.serve_forever(), server2.serve_forever())
asyncio.run(main())
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