def _store(self, entry, canonicalName, cacheKey):
entry.stored=time.time()
p=self._path_for_name_and_key(canonicalName, cacheKey)
debug("cache path is %r", p)
dname=dirname(p)
try:
os.makedirs(dname)
except OSError, e:
if e.errno!=errno.EEXIST:
if self.safe:
exception("error trying to create directory %s", dname)
else:
raise
def _retrieve(self, canonicalName, cacheKey):
p=self._path_for_name_and_key(canonicalName, cacheKey)
try:
f=file(p)
except IOError, e:
if e.errno==errno.ENOENT:
# not in cache
return None
else:
# some other problem
if self.safe:
exception("error trying to retrieve name %s, key %s, but soldiering on",
canonicalName,
cacheKey)
return None
else:
raise
if e.errno!=errno.EEXIST:
if self.safe:
exception("error trying to create directory %s", dname)
else:
raise
try:
fd, tempname=tempfile.mkstemp(suffix=".tmp",
dir=dname)
tempf=os.fdopen(fd, 'w')
cPickle.dump(entry, tempf)
tempf.close()
os.rename(tempname, p)
except:
if self.safe:
exception("error trying to store name %s, key %s, but soldiering on",
canonicalName,
cackeKey)
else:
raise
def invalidate(self, canonicalName):
"""
removes cache entries for the canonicalName.
This does not actually delete the cache entries, but
renames them.
"""
p=self._path_for_name(canonicalName)
dname=dirname(p)
# we need a name that isn't in use;
# the same canonicalName may be invalidated
# multiple times between cache clears.
