def lock(self):
"""Lock the file-viewer.
If locked, no one is allowed to run any extraction in `self.src` to
avoid files / directories get messed up.
There is a potential race-condition between getting and setting the
lock.
TODO: This should be re-implemented once we're on Django 1.9+ which
has support for get_or_set.
:return: `True` if the lock was attained,
`False` if there is an already existing lock.
"""
cache_key = self._cache_key(LOCKED)
msg = Message(cache_key)
if msg.get():
# Already locked
yield False
else:
# Not yet locked, save flag and delete on exit.
msg.save(True, time=LOCKED_TIMEOUT)
try:
yield True
finally:
msg.delete()
def test_extract_file_locked_message(self):
self.viewer.src = get_file('dictionary-test.xpi')
assert not self.viewer.is_extracted()
msg = Message(self.viewer._cache_key(LOCKED))
msg.save(True)
msg = extract_file(self.viewer)
assert str(msg.get()).startswith(u'File viewer is locked')
msg.delete()
def test_extract_file_locked_message(self):
self.viewer.src = get_file('dictionary-test.xpi')
assert not self.viewer.is_extracted()
msg = Message(self.viewer._cache_key(LOCKED))
msg.save(True)
msg = extract_file(self.viewer)
assert str(msg.get()).startswith(u'File viewer is locked')
msg.delete()
def extract_file(viewer, **kw):
# This message is for end users so they'll see a nice error.
msg = Message("file-viewer:%s" % viewer)
msg.delete()
# This flag is so that we can signal when the extraction is completed.
flag = Message(viewer._extraction_cache_key())
task_log.debug("[1@%s] Unzipping %s for file viewer." % (extract_file.rate_limit, viewer))
try:
flag.save("extracting") # Set the flag to a truthy value.
viewer.extract()
except Exception, err:
if settings.DEBUG:
msg.save(_("There was an error accessing file %s. %s.") % (viewer, err))
else:
msg.save(_("There was an error accessing file %s.") % viewer)
task_log.error("[1@%s] Error unzipping: %s" % (extract_file.rate_limit, err))
def extract_file(viewer, **kw):
# This message is for end users so they'll see a nice error.
msg = Message('file-viewer:%s' % viewer)
msg.delete()
# This flag is so that we can signal when the extraction is completed.
flag = Message(viewer._extraction_cache_key())
task_log.debug('[1@%s] Unzipping %s for file viewer.' %
(extract_file.rate_limit, viewer))
try:
flag.save('extracting') # Set the flag to a truthy value.
viewer.extract()
except Exception, err:
if settings.DEBUG:
msg.save(
_('There was an error accessing file %s. %s.') % (viewer, err))
else:
msg.save(_('There was an error accessing file %s.') % viewer)
task_log.error('[1@%s] Error unzipping: %s' %
(extract_file.rate_limit, err))
def extract_file(file_id, **kw):
# This message is for end users so they'll see a nice error.
viewer = FileViewer(File.objects.get(pk=file_id))
msg = Message('file-viewer:%s' % viewer)
msg.delete()
# This flag is so that we can signal when the extraction is completed.
flag = Message(viewer._extraction_cache_key())
task_log.debug('[1@%s] Unzipping %s for file viewer.' % (
extract_file.rate_limit, viewer))
try:
flag.save('extracting') # Set the flag to a truthy value.
viewer.extract()
except Exception, err:
if settings.DEBUG:
msg.save(_('There was an error accessing file %s. %s.')
% (viewer, err))
else:
msg.save(_('There was an error accessing file %s.') % viewer)
task_log.error('[1@%s] Error unzipping: %s' % (extract_file.rate_limit,
err))
def extract_file(viewer, **kw):
# This message is for end users so they'll see a nice error.
msg = Message('file-viewer:%s' % viewer)
msg.delete()
task_log.debug('Unzipping %s for file viewer.' % viewer)
try:
lock_attained = viewer.extract()
if not lock_attained:
info_msg = _(
'File viewer is locked, extraction for %s could be '
'in progress. Please try again in approximately 5 minutes.' %
viewer)
msg.save(info_msg)
except Exception, err:
error_message = _('There was an error accessing file %s.') % viewer
if settings.DEBUG:
msg.save(error_message + ' ' + err)
else:
msg.save(error_message)
task_log.error('Error unzipping: %s' % err)
def extract_file(viewer, **kw):
# This message is for end users so they'll see a nice error.
msg = Message('file-viewer:%s' % viewer)
msg.delete()
task_log.debug('Unzipping %s for file viewer.' % viewer)
try:
lock_attained = viewer.extract()
if not lock_attained:
info_msg = _(
'File viewer is locked, extraction for %s could be '
'in progress. Please try again in approximately 5 minutes.'
% viewer)
msg.save(info_msg)
except Exception, err:
error_message = _('There was an error accessing file %s.') % viewer
if settings.DEBUG:
msg.save(error_message + ' ' + err)
else:
msg.save(error_message)
task_log.error('Error unzipping: %s' % err)
