Bugs item #1469557, was opened at 2006-04-12 17:13
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Category: Python Library
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Bruce (brucepeterson)
Assigned to: Nobody/Anonymous (nobody)
Summary: FTP modue functions are not re-entrant,give odd exceptions
Initial Comment:
If I define a class using the Thread and FTP moudles,
start a process which gathers FTP responses,
additional calls to the class may have the responses
of the thread instead of the main loop (or vice versa)
This causes weird and unexpected exceptions from the
ftplib.
For instance I get the following error when the
thread process does a pwd() function
error_reply: 213 34603008
The "213" reply is a response from the main process
size() function
---------
Code
---------
from time import sleep
from threading import Thread
class ftpMachine(Thread, ftplib.FTP):
def __init__(self, svr, user, passwd):
Thread.__init__(self)
ftplib.FTP.__init__(self, svr, user, passwd)
def run(self):
for x in xrange(20):
output="Thread -"+str(self.nlst())[:30]
print output
sleep (0.0100)
def main():
aCon = ftpMachine("LocalFTP", "user", "")
aCon.start()
for x in xrange(20):
output = "Main -- " + str(aCon.size("File"))
print output
sleep (0.010)
Workround:
Rewrite code to create a third worker thread for
response isolation? Don't know that this would solve
the problem.
---------------
Exception example
---------------
Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\Python24\lib\threading.py", line 442, in
__bootstrap
self.run()
File "dualFTPIssue.py", line 17, in run
output = "Thread output " + str(self.nlst())[:30]
+" ..."
File "C:\Python24\lib\ftplib.py", line 448, in nlst
self.retrlines(cmd, files.append)
File "C:\Python24\lib\ftplib.py", line 396, in
retrlines
conn = self.transfercmd(cmd)
File "C:\Python24\lib\ftplib.py", line 345, in
transfercmd
return self.ntransfercmd(cmd, rest)[0]
File "C:\Python24\lib\ftplib.py", line 321, in
ntransfercmd
host, port = self.makepasv()
File "C:\Python24\lib\ftplib.py", line 299, in
makepasv
host, port = parse227(self.sendcmd('PASV'))
File "C:\Python24\lib\ftplib.py", line 566, in
parse227
raise error_reply, resp
error_reply: 213 34603008
----------------------------------------------------------------------
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https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1469557&group_id=5470
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