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gh-112020: socketserver: Add an example for keeping the connection open #112054

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272de5b
Update socketserver.rst
talcs Nov 14, 2023
8028b11
whitespace
AA-Turner Jan 12, 2024
6828277
Update Doc/library/socketserver.rst
talcs Feb 20, 2024
8dfe64a
Added while loop to the existing handler example
talcs Feb 20, 2024
d92bebb
updating readline example too
talcs Feb 20, 2024
93c7d86
solved conflicts
talcs Feb 20, 2024
9c6ad3c
fix while loops in handler
talcs Feb 21, 2024
d860d46
Update socketserver.rst
talcs Feb 21, 2024
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32 changes: 21 additions & 11 deletions Doc/library/socketserver.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -493,11 +493,16 @@ This is the server side::

def handle(self):
# self.request is the TCP socket connected to the client
self.data = self.request.recv(1024).strip()
print("{} wrote:".format(self.client_address[0]))
print(self.data)
# just send back the same data, but upper-cased
self.request.sendall(self.data.upper())
self.data = self.request.recv(1024)
while self.data:
self.data = self.data.strip()
print("Received from {}:".format(self.client_address[0]))
print(self.data)
# just send back the same data, but upper-cased
self.request.sendall(self.data.upper())
# Receive next message from client. Will return an empty message
# if client has hung up
self.data = self.request.recv(1024)

if __name__ == "__main__":
HOST, PORT = "localhost", 9999
Expand All @@ -516,12 +521,17 @@ objects that simplify communication by providing the standard file interface)::
def handle(self):
# self.rfile is a file-like object created by the handler;
# we can now use e.g. readline() instead of raw recv() calls
self.data = self.rfile.readline().strip()
print("{} wrote:".format(self.client_address[0]))
print(self.data)
# Likewise, self.wfile is a file-like object used to write back
# to the client
self.wfile.write(self.data.upper())
self.data = self.rfile.readline()
while self.data:
self.data = self.data.strip()
print("Received from {}:".format(self.client_address[0]))
print(self.data)
# Likewise, self.wfile is a file-like object used to write back
# to the client
self.wfile.write(self.data.upper())
# Receive next message from client. Will return an empty message
# if client has hung up
self.data = self.rfile.readline()

The difference is that the ``readline()`` call in the second handler will call
``recv()`` multiple times until it encounters a newline character, while the
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