我在互联网上看到和阅读了很多关于这个特定问题的内容。我正在使用Python中的socket编写一个简单的聊天服务器和客户端，主要是为了学习目的。
我发现了一个问题。
以下是我的服务器代码：
__author__ = 'pchakraverti'
import socket
import select
import sys
class NickSocketMap(object):
count = 0
def __init__(self, nick, client_socket):
self.nick = nick
self.client_socket = client_socket
NickSocketMap.count += 1
@staticmethod
def display_count():
print "Total number of clients is %d" % NickSocketMap.count
host = ""
port = 7575
socket_list = []
nick_list = []
cnt = 0
recv_buffer = 1024
def register_nick(nick, client_socket):
obj = NickSocketMap(nick, client_socket)
nick_list.append(obj)
def process_request(request_string, client_socket):
parts = request_string.split("|")
if parts[0] == "set_nick":
register_nick(parts[1], client_socket)
client_socket.send("nick_set")
elif parts[0] == "transmit_msg":
broadcast_message(parts[1], parts[2])
return 1
def broadcast_message(message, client_nick):
for s in nick_list:
if s.nick == client_nick:
try:
s.client_socket.send(message)
except socket.errno, ex:
print ex
break
def run_server():
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.bind((host, port))
except socket.errno, ex:
print ex
sys.exit(-1)
sock.listen(10)
# add the parent socket in the list
socket_list.append(sock)
# keep the server alive
while True:
try:
read_ready, write_ready, in_error = select.select(socket_list, [], [], 0)
except select.error, ex:
print ex
continue
for s in read_ready:
# check if s is the parent socket
if s == sock:
# accept new connection and append to list
try:
con, addr = s.accept()
if con not in socket_list:
socket_list.append(con)
except socket.errno, ex:
print ex
else:
try:
# receive packet from connected client
packet = s.recv(recv_buffer)
if not packet:
socket_list.remove(s)
read_ready.remove(s)
for n in nick_list:
if n.client_socket == s:
nick_list.remove(n)
break
break
print packet
except socket.errno, ex:
print ex
continue
process_request(packet, s)
sock.close()
if __name__ == "__main__":
run_server()
这是我的客户端代码：
__author__ = 'pchakraverti'
import socket
nick = ""
host = "192.168.0.167"
port = 7575
sock = ""
def welcome():
print "Welecome to SecuChat!"
print "---------------------"
def init():
nick = raw_input("Enter your chat nickname : ")
print nick
global sock
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect((host, port))
except socket.errno, ex:
print ex
sock.send("set_nick|"+nick)
#sock.close()
if __name__ == "__main__":
welcome()
init()
在客户端代码中，如果我不执行
sock.close() ，服务器会遇到异常：Traceback (most recent call last):
File "server.py", line 102, in <module>
run_server()
File "server.py", line 84, in run_server
packet = s.recv(recv_buffer)
socket.error: [Errno 104] Connection reset by peer
然而，当我添加这行代码时，问题就不会发生了。
现在我有两个问题：
i）我在server.py中处理了异常，为什么这个异常没有被处理，而是导致代码崩溃？如何使服务器更加健壮，我漏掉了什么？
ii）与客户端中的sock.close()的代码行有关的崩溃和异常背后的逻辑是什么？