我正在写一个聊天程序。我的每个客户机都在一个单独的线程中向服务器发出一个openget请求(另一个线程用于发布他们自己的消息)。我不想有太多的开销。也就是说,客户端不经常发送get请求来查看是否有任何未看到的消息。相反,它们总是只有一个打开的get请求来获取新消息,一旦服务器用新的不可见消息响应它们,它们就会立即向服务器发送另一个get请求以保持更新,以此类推。 因此,在客户端,我有如下内容:
def coms():
headers = {'data': myAut.strip()}
resp = requests.get("http://localhost:8081/receive", headers=headers,timeout=1000000)
print(resp.text)
t = threading.Thread(target=coms, args=())
t.start()
在服务器端,我有如下内容:
def do_GET(self):
if self.path == '/receive':
auth=self.headers['data']
#Using auth, find who has sent this message
u=None
for i in range(len(users)):
print(users[i].aut,auth)
if users[i].aut==auth:
u=users[i]
break
t=threading.Thread(target=long_Poll,args=(u,self))
t.start()
及
def long_Poll(client,con):
while True:
if len(client.unreadMessages) != 0:
print("IM GONNA RESPOND")
con.end_headers()
con.wfile.write(bytes(client.unreadMessages, "utf8"))
client.unreadMessages=[]
break
con.send_response(200)
con.end_headers()
这背后的逻辑是服务器想要进行长轮询,也就是说,它在另一个繁忙等待线程中保持GET/receive
请求打开。当任何客户机通过POST/message
向服务器发送消息时,它只会将此新消息添加到其他客户机unseenMessages
,因此一旦它们的线程运行,它们就从while True:
循环中出来,服务器会给它们新消息。换句话说,我希望保持客户机的GET/receive
处于打开状态,并且不响应它,只要我愿意。
这个过程可能需要很长时间。也许聊天室是空闲的,很长一段时间没有消息。
现在的问题是,当我的客户机发送第一条GET/receive
消息时,它就会收到这个错误,尽管我已经将GET/receive
请求中的超时值设置得太多了
C:\Users\erfan\Desktop\web\client\venv\Scripts\python.exe C:\Users\erfan\Desktop\web\client\Client.py
Hossein
Welcome to chatroom Hossein ! Have a nice time !
Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\urllib3\connectionpool.py", line 677, in urlopen
chunked=chunked,
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\urllib3\connectionpool.py", line 426, in _make_request
six.raise_from(e, None)
File "<string>", line 3, in raise_from
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\urllib3\connectionpool.py", line 421, in _make_request
httplib_response = conn.getresponse()
File "C:\Users\erfan\AppData\Local\Programs\Python\Python37\lib\http\client.py", line 1321, in getresponse
response.begin()
File "C:\Users\erfan\AppData\Local\Programs\Python\Python37\lib\http\client.py", line 296, in begin
version, status, reason = self._read_status()
File "C:\Users\erfan\AppData\Local\Programs\Python\Python37\lib\http\client.py", line 265, in _read_status
raise RemoteDisconnected("Remote end closed connection without"
http.client.RemoteDisconnected: Remote end closed connection without response
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\requests\adapters.py", line 449, in send
timeout=timeout
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\urllib3\connectionpool.py", line 727, in urlopen
method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\urllib3\util\retry.py", line 410, in increment
raise six.reraise(type(error), error, _stacktrace)
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\urllib3\packages\six.py", line 734, in reraise
raise value.with_traceback(tb)
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\urllib3\connectionpool.py", line 677, in urlopen
chunked=chunked,
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\urllib3\connectionpool.py", line 426, in _make_request
six.raise_from(e, None)
File "<string>", line 3, in raise_from
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\urllib3\connectionpool.py", line 421, in _make_request
httplib_response = conn.getresponse()
File "C:\Users\erfan\AppData\Local\Programs\Python\Python37\lib\http\client.py", line 1321, in getresponse
response.begin()
File "C:\Users\erfan\AppData\Local\Programs\Python\Python37\lib\http\client.py", line 296, in begin
version, status, reason = self._read_status()
File "C:\Users\erfan\AppData\Local\Programs\Python\Python37\lib\http\client.py", line 265, in _read_status
raise RemoteDisconnected("Remote end closed connection without"
urllib3.exceptions.ProtocolError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\erfan\AppData\Local\Programs\Python\Python37\lib\threading.py", line 917, in _bootstrap_inner
self.run()
File "C:\Users\erfan\AppData\Local\Programs\Python\Python37\lib\threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "C:\Users\erfan\Desktop\web\client\Client.py", line 13, in coms
resp = requests.get("http://localhost:8081/receive", headers=headers,timeout=1000000)
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\requests\api.py", line 76, in get
return request('get', url, params=params, **kwargs)
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\requests\api.py", line 61, in request
return session.request(method=method, url=url, **kwargs)
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\requests\sessions.py", line 530, in request
resp = self.send(prep, **send_kwargs)
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\requests\sessions.py", line 643, in send
r = adapter.send(request, **kwargs)
File "C:\Users\erfan\Desktop\web\client\venv\lib\site-packages\requests\adapters.py", line 498, in send
raise ConnectionError(err, request=request)
requests.exceptions.ConnectionError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))
=========================================================================== 更新:
奇怪的是,每当我将GET/receive
模块编辑为以下内容时:
def do_GET(self):
while True:
pass
一切正常。 但当我这样做的时候:
def do_GET(self):
t=threading.Thread(target=long_Poll,args=(self))
t.start()
def long_Poll(con):
client =None
while True:
pass
它会给客户端同样的错误
我的意思是问题是因为我把self对象传递给另一个函数来响应?也许它会中断连接?我记得在Java套接字编程中也遇到过同样的问题,当我想使用套接字在两个函数中进行通信时,有时会遇到一些错误?然而,这里我只想在长轮询函数中进行通信,而不想在其他任何地方进行通信
==================================================================
更新: 我还把我的服务器和客户端代码放在这里。为了简洁起见,我在这里发布了paste.ubuntu链接
客户:
https://paste.ubuntu.com/p/qJmRjYy4Y9/
服务器:
https://paste.ubuntu.com/p/rVyHPs4Rjz/
客户机第一次键入时,他输入自己的名字,然后开始发送GET/receive
请求。然后,客户端可以通过发送POST/message
请求将其消息发送给其他人。每当用户向服务器发送消息时,服务器都会(通过他的身份)找到他并更新所有其他客户端unseenMessages
,这样每当他们的长轮询线程继续时,他们就会得到新消息,而他们的客户端也会立即发送另一条GET/receive
消息
我找到了答案。我正在尝试使用单线程语法创建一个多线程服务器! 我遵循这个思路,创建了一个多线程HTTP服务器 Multithreaded web server in python
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