I changed the code of a filter which is already configured and running. Now I have to install it. Last time I issued courierfilter stop, and then start. However, that way I have to reload also clamav databases, which takes a long time. Is there any better way to upgrade the running Python process?
BTW, in order to tell distributed filter from home-brewed ones, I install sym
links in the dist-package/pythonfilter directory, which point to the source
file. I note that Python does not produce any .pyc in that case. However, the
following command compiles in the current directory irrespectively of whatever:
python -m compileall -l attachments.py
Since the pyc is what should get loaded when loading a module, an idea could be
to reload modules if they have been recompiled since the last time they were
loaded. Let me attach the idea. Beware: I did'n run it, not even once, and
didn't fully understand the caveats about using reload(), see e.g.:
https://stackoverflow.com/questions/437589/how-do-i-unload-reload-a-python-module#answer-438845
One more question, about virtualenv. Has anyone had experience loading
Pythonfilter that way under Courier? Another possibility is to install
Pythonfilter globally, but keep additional packages in a virtualenv, just to
ease tracking requirements.
TIA
Ale
---
../courier-pythonfilter/courier-pythonfilter-1.11/build/scripts-2.7/pythonfilter
2016-10-31 17:21:05.543243721 +0100
+++ ../pythonfilter-modified-but-not-tested.py 2017-06-07 13:09:59.818621251
+0200
@@ -111,6 +111,11 @@
(importError[0], importError[1]))
sys.stderr.write(''.join(traceback.format_tb(importError[2])))
sys.exit()
+ try:
+ moduleDate = os.stat(module.__file__).st_mtime
+ except OSError:
+ moduleDate = None
+
if hasattr(module, 'initFilter'):
try:
module.initFilter()
@@ -126,7 +131,7 @@
try:
# Store the name of the filter module and a reference to its
# dofilter function in the "filters" array.
- filters.append((moduleName, module.doFilter, bypass))
+ filters.append((moduleName, module.doFilter, bypass, module,
moduleDate))
except AttributeError:
# Log bad modules
importError = sys.exc_info()
@@ -203,13 +208,23 @@
# Prepare a set of filters that will not be run if a module returns
# a 2XX code, and specifies a list of filters to bypass.
bypass = set()
- for i_filter in filters:
+ for i_i, i_filter in enumerate(filters):
# name = i_filter[0]
# function = i_filter[1]
# bypass = i_filter[2]
if i_filter[0] in bypass:
continue
try:
+ if i_filter[4] is not None:
+ moduleDate = os.stat(i_filter[3].__file__).st_mtime
+ if moduleDate > i_filter[4]:
+ reload(i_filter[3])
+ i_filter[4] = moduleDate
+ filters[i_i] = (i_filter[0], i_filter[1], i_filter[2],
i_filter[3], i_filter[4])
+ sys.stderr.write('Reloaded %s\n' % i_filter[0])
+ except:
+ sys.stderr.write('Not reloaded %s\n' % i_filter[0])
+ try:
replyCode = i_filter[1](bodyFile, controlFileList)
except:
filterError = sys.exc_info()
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