This question will expand on: Best way to open a socket in Python
When opening a socket how can I test to see if it has been established, and that it did not timeout, or generally fail.
Edit:
I tried this:
try:
s.connect((address, '80'))
except:
alert('failed' + address, 'down')
but the alert function is called even when that connection should have worked.
12 years later for anyone having similar problems.
try:
s.connect((address, '80'))
except:
alert('failed' + address, 'down')
doesn't work because the port '80' is a string. Your port needs to be int.
try:
s.connect((address, 80))
This should work. Not sure why even the best answer didnt see this.
You should really post:
Here is my code, which works:
import socket, sys
def alert(msg):
print >>sys.stderr, msg
sys.exit(1)
(family, socktype, proto, garbage, address) = \
socket.getaddrinfo("::1", "http")[0] # Use only the first tuple
s = socket.socket(family, socktype, proto)
try:
s.connect(address)
except Exception, e:
alert("Something's wrong with %s. Exception type is %s" % (address, e))
When the server listens, I get nothing (this is normal), when it doesn't, I get the expected message:
Something's wrong with ('::1', 80, 0, 0). Exception type is (111, 'Connection refused')
You should really post:
Here is my code, which works:
import socket, sys
def alert(msg):
print >>sys.stderr, msg
sys.exit(1)
(family, socktype, proto, garbage, address) = \
socket.getaddrinfo("::1", "http")[0] # Use only the first tuple
s = socket.socket(family, socktype, proto)
try:
s.connect(address)
except Exception, e:
alert("Something's wrong with %s. Exception type is %s" % (address, e))
When the server listens, I get nothing (this is normal), when it doesn't, I get the expected message:
Something's wrong with ('::1', 80, 0, 0). Exception type is (111, 'Connection refused')
12 years later for anyone having similar problems.
try:
s.connect((address, '80'))
except:
alert('failed' + address, 'down')
doesn't work because the port '80' is a string. Your port needs to be int.
try:
s.connect((address, 80))
This should work. Not sure why even the best answer didnt see this.
You should really post:
Here is my code, which works:
import socket, sys
def alert(msg):
print >>sys.stderr, msg
sys.exit(1)
(family, socktype, proto, garbage, address) = \
socket.getaddrinfo("::1", "http")[0] # Use only the first tuple
s = socket.socket(family, socktype, proto)
try:
s.connect(address)
except Exception, e:
alert("Something's wrong with %s. Exception type is %s" % (address, e))
When the server listens, I get nothing (this is normal), when it doesn't, I get the expected message:
Something's wrong with ('::1', 80, 0, 0). Exception type is (111, 'Connection refused')
You can use the function connect_ex. It doesn't throw an exception. Instead of that, returns a C style integer value (referred to as errno in C):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
result = s.connect_ex((host, port))
s.close()
if result:
print "problem with socket!"
else:
print "everything it's ok!"
Source: Stackoverflow.com