python应用程序之间的通信
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Communication between python applications
提问by Lufftre
I'm having trouble finding a good solution for a client server system where the clients make requests to the server and the server responds with the result. The server needs to be independent from the clients, i.e. if I create a new python application I want to easily be able to connect to the server and send requests. One possible solution I know of is using sockets, but that feels unnecessary complicated. I've tried looking into using Managers but I'm not sure if it's on the right track.
我在为客户端服务器系统找到一个好的解决方案时遇到了麻烦，其中客户端向服务器发出请求，服务器以结果进行响应。服务器需要独立于客户端，即如果我创建一个新的 python 应用程序，我希望能够轻松连接到服务器并发送请求。我知道的一种可能的解决方案是使用套接字，但这感觉不必要的复杂。我试过考虑使用 Managers，但我不确定它是否在正确的轨道上。
My goal is to have something working like this:
我的目标是让事情像这样工作：
result = server.send("2+2") # result should now be 4
回答by systemHyman
Check out ZeroMQ. It can be used point to point like a super powered socket and looks nice and clean in your code like your example. Thisexampleshows how easy it can be.
退房ZeroMQ。它可以像超级电源插座一样点对点使用，并且在您的代码中看起来像您的示例一样干净整洁。这个例子展示了它是多么容易。
Or you could do a simple RESTinterface using a light weight web service framework like Bottleor Flaskon the server side. Those can run stand alone at first for ease of use and later put them behind a web server (nginxwith uwsgifor example) later for performance. On the client side talk to it with regular python requests module.
或者，您可以REST使用轻量级 Web 服务框架（如服务器端Bottle或Flask服务器端）来创建一个简单的界面。那些能够运行得，易于使用的独立，后来把他们后面的Web服务器（nginx带有uwsgi为例）后的性能。在客户端使用常规的 python requests 模块与它交谈。
回答by CristiFati
Once I played with these things (in Python) and here's an example (don't mind the code style, format, efficiency, as they are lame, lots of NO-NOs from programming's PoV, just look at it as it was a starting point):
一旦我玩过这些东西（在 Python 中），这是一个例子（不要介意代码风格、格式、效率，因为它们很蹩脚，编程的 PoV 中有很多 NO-NO，只是看看它，因为它是一个开始观点）：
server.py:
服务器.py：
import sys
import select
from SocketServer import TCPServer, StreamRequestHandler
HOST = "127.0.0.1"
PORT = 12345
class DummyRequestHandler(StreamRequestHandler):
def handle(self):
text = ""
while 1:
if select.select([self.rfile], [], [], 0.5)[0] == [self.rfile]:
char = self.rfile.read(1)
if char == ";":
break
else:
text += char
try:
result = eval(text)
except Exception as e:
result = str(e)
self.wfile.write(str(result) + ";")
print "Listening on %s:%d" % (HOST, PORT)
server = TCPServer((HOST, PORT), DummyRequestHandler)
server.serve_forever()
client.py:
客户端.py：
import sys
import socket
import select
HOST = "127.0.0.1"
PORT = 12345
EXIT_TEXT = "EXIT"
text = ""
while not text:
text = raw_input("Enter text to send (%s to exit) :" % EXIT_TEXT)
if text.upper() == EXIT_TEXT:
print "Exiting"
sys.exit(0)
if text[-1] != ";":
text += ";"
s4 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s4.connect((HOST, PORT))
s4.send(text)
reply = ""
while 1:
if select.select([s4], [], [], 0.5)[0] == [s4]:
char = s4.recv(1)
if char == ";":
break
else:
reply += char
print "Server replied: %s\n" % reply
s4.close()
I've tested it using Python2.7.10on Win. It works with simple expressions.
我已经在Win上使用Python2.7.10对其进行了测试。它适用于简单的表达式。
