Reputation: 2279
My python socket server listens and then connects to a client that will then send a indeterminate number of strings from a user. The client may then close or lose connection to the server.
This causes an error.
[Errno 10053] An established connection was aborted by the software in your host machine. or [Errno 10054] An existing connection was forcibly closed by the remote host
How do I handle this event so that I can close the connection and restart my server listening for a reconnect?
Python Server example:
# Echo server program
import socket
import sys
HOST = None # Symbolic name meaning all available interfaces
PORT = 7001 # Arbitrary non-privileged port
s = None
def startListening():
print "starting to listen"
for res in socket.getaddrinfo(HOST, PORT, socket.AF_UNSPEC,
socket.SOCK_STREAM, 0, socket.AI_PASSIVE):
af, socktype, proto, canonname, sa = res
try:
s = socket.socket(af, socktype, proto)
except socket.error as msg:
s = None
continue
try:
s.bind(sa)
s.listen(1)
except socket.error as msg:
s.close()
s = None
continue
break
if s is None:
print 'could not open socket'
sys.exit(1)
conn, addr = s.accept()
print 'Connected by', addr
while 1:
data = conn.recv(1024)
if not data:
break
print data
message = ""
while not "quit" in message:
message = raw_input('Say Something : ')
conn.sendall(message)
#conn.send("I got that, over!")
conn.close()
print "connection closed"
while 1:
startListening()
python client example:
# Echo client program
import socket
import sys
HOST = 'localhost' # The remote host
PORT = 7001 # The same port as used by the server
s = None
for res in socket.getaddrinfo(HOST, PORT, socket.AF_UNSPEC, socket.SOCK_STREAM):
af, socktype, proto, canonname, sa = res
try:
s = socket.socket(af, socktype, proto)
except socket.error as msg:
s = None
continue
try:
s.connect(sa)
except socket.error as msg:
s.close()
s = None
continue
break
if s is None:
print 'could not open socket'
sys.exit(1)
s.sendall("Please send me some strings")
data = ""
while ("quit" not in data):
data = s.recv(1024)
print 'Received', repr(data)
s.close()
To reproduce this error, run the server in one command window and the client in a second, then close the client window.
Upvotes: 2
Views: 35374
Reputation: 2279
Adding try: except: around the data send and data recv in the server script appears to mitigate the problem:
# Echo server program
import socket
import sys
HOST = None # Symbolic name meaning all available interfaces
PORT = 7001 # Arbitrary non-privileged port
s = None
def startListening():
print "starting to listen"
for res in socket.getaddrinfo(HOST, PORT, socket.AF_UNSPEC,
socket.SOCK_STREAM, 0, socket.AI_PASSIVE):
af, socktype, proto, canonname, sa = res
try:
s = socket.socket(af, socktype, proto)
except socket.error as msg:
s = None
continue
try:
s.bind(sa)
s.listen(1)
except socket.error as msg:
s.close()
s = None
continue
break
if s is None:
print 'could not open socket'
sys.exit(1)
conn, addr = s.accept()
print 'Connected by', addr
while 1:
try:
data = conn.recv(1024)
except:
print "cannot recieve data"
break
if not data:
break
print data
message = ""
while not "quit" in message:
message = raw_input('Say Something : ')
try:
conn.sendall(message)
except Exception as exc:
#print exc # or something.
print "message could not be sent"
break
#conn.send("I got that, over!")
conn.close()
print "connection closed"
while 1:
startListening()
Upvotes: 1
Reputation:
I think when client is closed unexpectedly, that according to SIGPIPE you should handle the signal
Upvotes: 0
Reputation: 409482
Simply close your side of the connection and be ready to accept a new connection again.
The best way to handle this is to separate the creation of the server socket and the accept/read/write loop:
create_server_socket()
while True:
accept_new_connection();
try:
read_request();
write_response()
finally:
close_connection()
Upvotes: 0