reloading updated modules in long running server?

[aurora]

I am looking for a way for reloading updated modules in a long running
server. I'm not too concerned about cascaded reload or objects already
created. Just need to reload module xxx if the corresponding xxx.py is
updated.

I found something useful in module.__file__. Would it work if I use it to
generate filenames xxx.py xxx.pyc and then compare their mtime? I'm not
too sure about the mechanism of generation of .pyc file. Would it be too
system specific to reply on?

[Pierre Quentel]

I don't know if there is a way to catch the event "a file has been
modified in the file system" but you can always check if something has
changed in sys.modules every time a request is processed by the server,
or every n second

Something like this should work :

updateTime={}
for m in sys.modules.values():
if m and hasattr(m,"__file__"):
modTime=os.path.getmtime(m.__file__)
if updateTime.has_key(m):
if modTime != updateTime[m]:
reload(m)
updateTime[m]=modTime
else:
updateTime[m]=modTime

Pierre

aurora a écrit :

I am looking for a way for reloading updated modules in a long running
server. I'm not too concerned about cascaded reload or objects already
created. Just need to reload module xxx if the corresponding xxx.py is
updated.

I found something useful in module.__file__. Would it work if I use it
to generate filenames xxx.py xxx.pyc and then compare their mtime? I'm
not too sure about the mechanism of generation of .pyc file. Would it
be too system specific to reply on?

[Bryan]

Pierre Quentel wrote:

I don't know if there is a way to catch the event "a file has been
modified in the file system" but you can always check if something has
changed in sys.modules every time a request is processed by the server,
or every n second

Something like this should work :

updateTime={}
for m in sys.modules.values():
if m and hasattr(m,"__file__"):
modTime=os.path.getmtime(m.__file__)
if updateTime.has_key(m):
if modTime != updateTime[m]:
reload(m)
updateTime[m]=modTime
else:
updateTime[m]=modTime

Pierre

if you have class A in module a.py and class B(A) in module b.py, and in module c.py you instantiale b = B(). will
there be a problem if you reload module b, then c, then a? in the previous example, m in sys.modules.values() doesn't
take this into account.

bryan