I am writing an Imap client. The Imap server (Groupwise) I connect to is
really slow at accepting logins.
So I have made a connection pool where I store the open connections to
the server.
But once in a while I get a memory segment error on the server and it
crashes.
I suspect what happens is that a connection has been idle for to long,
ad the connection dropped by the imap server. Which might cause some
memory to be freed that is then accessed when I call noop().
It could also be be some kind of threading problem.
Does any of you hav an ide as to how I can find out? I am not used to
these kind of problems, having been spoiled by Python for too long.
regards Max M
I have attached the connection pool code in the bottom.
##
# a borg/singleton for pooling connections.
# Necessary as login can take a looong time
class ConnectionPool:
__shared_state = {}
def __init__(self):
self.__dict__ = self.__shared_state
def getConnection(self, server_uri, user, password):
if not hasattr(self, 'connections'):
self.connections = {}
user_key = (server_uri, user, password)
user_connections = self.connections.setdefault(user_key, [])
# first try and return a connection from the pool
for i in range(len(user_connections)-1, -1, -1):
# a connection can be timed out,
# try noop to see if it's still open
connection = user_connections[i]
try:
connection.noop()
return user_connections.pop(i)
except: # else login again
user_connections.pop(i)
# if no usable connections in the pool,
# create new one and return it
return Imap4Connector(server_uri, user, password)
def release(self, connection):
# take the connection and put it in the pool
user_key = (connection.server_uri, connection.user, \
connection.password)
user_connections = self.connections.setdefault(user_key, [])
user_connections.append(connection)
--
hilsen/regards Max M, Denmark
http://www.mxm.dk/
IT's Mad Science
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