Question

我正在尝试部署aiohttp网络应用程序，但无法弄清楚如何让应用程序通过unix套接字提供服务，我认为我需要这样才能让nginx和gunicorn相互通信。

aiohttp文档中的简单示例应用程序保存为app.py：

import asyncio
from aiohttp import web

@asyncio.coroutine
def hello(request):
    return web.Response(body=b'Hello')

app = web.Application()
app.router.add_route('GET', '/', hello)

if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    handler = app.make_handler()
    f = loop.create_server(handler, '0.0.0.0', 8080)
    srv = loop.run_until_complete(f)
    try:
        loop.run_forever()
    except KeyboardInterrupt:
        pass
    finally:
        loop.run_until_complete(handler.finish_connections(1.0))
        srv.close()
        loop.run_until_complete(srv.wait_closed())
        loop.run_until_complete(app.finish())
    loop.close()

直接使用gunicorn运行：

gunicorn -k aiohttp.worker.GunicornWebWorker -b 0.0.0.0:8000 app:app

但是当我尝试将它绑定到unix套接字时，我会收到以下错误。

gunicorn -k aiohttp.worker.GunicornWebWorker -b unix:my_sock.sock app:app

回溯：

[2015-08-09 12:26:05 -0700] [26898] [INFO] Booting worker with pid: 26898
[2015-08-09 12:26:06 -0700] [26898] [ERROR] Exception in worker process:
Traceback (most recent call last):
  File "/home/claire/absapp/venv/lib/python3.4/site-  packages/gunicorn/arbiter.py", line 507, in spawn_worker 
    worker.init_process()
  File "/home/claire/absapp/venv/lib/python3.4/site-packages/aiohttp/worker.py", line 28, in init_process
    super().init_process()
  File "/home/claire/absapp/venv/lib/python3.4/site-packages/gunicorn/workers/base.py", line 124, in init_process
    self.run()
  File "/home/claire/absapp/venv/lib/python3.4/site-packages/aiohttp/worker.py", line 34, in run
    self.loop.run_until_complete(self._runner)
  File "/usr/lib/python3.4/asyncio/base_events.py", line 268, in run_until_complete
    return future.result()
  File "/usr/lib/python3.4/asyncio/futures.py", line 277, in result
    raise self._exception
  File "/usr/lib/python3.4/asyncio/tasks.py", line 236, in _step
    result = next(coro)
  File "/home/claire/absapp/venv/lib/python3.4/site-packages/aiohttp/worker.py", line 81, in _run
    handler = self.make_handler(self.wsgi, *sock.cfg_addr)
TypeError: make_handler() takes 4 positional arguments but 11 were given
[2015-08-09 12:26:06 -0700] [26898] [INFO] Worker exiting (pid: 26898)

我在aiohttp问题中遇到了一些问题（https://github.com/KeepSafe/aiohttp/issues/136）使用socket创建一个套接字作为参数放在loop.create_server（）函数中，但我无法得到任何工作。（我也不知道他的代码中的应用程序是否是同一个web.Application对象）

有人知道如何让这项工作成功吗？谢谢！

Answer 1

问题是GunicornWebWorker不支持unix域套接字。它来自GunicornWebWorker.make_handler(self, app, host, port)，它需要参数：host和port。显然，如果你使用的是unix socket，你就没有它们，而是拥有socket的路径。

让我们看一下GunicornWebWorker._run()的开头：

def _run(self):
    for sock in self.sockets:
        handler = self.make_handler(self.wsgi, *sock.cfg_addr)
    ...

如果-b localhost:8000 sock.cfg_addr为['localhost', 8000]，则-b unix:my_sock.sock只有'my_sock.sock'。这是错误TypeError: make_handler() takes 4 positional arguments but 11 were given的来源。它是unpacks字符串，而不是列表。

解决此问题的快捷方法是将GunicornWebWorker子类化，并重新定义GunicornWebWorker.make_handler()以忽略host和port。反正他们都没用过。你可以这样做：

class FixedGunicornWebWorker(worker.GunicornWebWorker):
    def make_handler(self, app, *args):
        if hasattr(self.cfg, 'debug'):
            is_debug = self.cfg.debug
        else:
            is_debug = self.log.loglevel == logging.DEBUG

        return app.make_handler(
            logger=self.log,
            debug=is_debug,
            timeout=self.cfg.timeout,
            keep_alive=self.cfg.keepalive,
            access_log=self.log.access_log,
            access_log_format=self.cfg.access_log_format)

注意您需要在PYTHONPATH中拥有包含固定工作人员的套餐。否则Gunicorn将无法找到它。例如，如果将fixed_worker.py文件中的固定工作者放在您运行gunicorn的同一目录中，则可以像以下一样使用它：

$ PYTHONPATH="`pwd`:$PYTHONPATH" gunicorn -k fixed_worker.FixedGunicornWebWorker -b unix:my_sock.sock app:app

UPD 还在aiohttp存储库中打开了issue。

使用gunicorn和nginx部署aiohttp.web应用程序

1 个答案: