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Don't read cache entry twice with exclusive access

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Unrud 2017-08-01 17:16:58 +02:00
parent 1576f9b7fb
commit ed3708db22
1 changed files with 9 additions and 11 deletions
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20
radicale/storage.py
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@ -1299,17 +1299,15 @@ class Collection(BaseCollection):
href)
vobject_item = None
if input_hash != cache_hash:
# Lock the item cache to prevent multpile processes from generating
# the same data in parallel. This is only needed for performance.
if self._lock.locked() == "w":
# The access is already exclusive, use dummy context manager.
lock = contextlib.suppress()
else:
lock = self._acquire_cache_lock("item")
with lock:
# Check if another process created the file in the meantime.
cache_hash, uid, etag, text, tag, start, end = \
self._load_item_cache(href)
with contextlib.ExitStack() as lock_stack:
# Lock the item cache to prevent multpile processes from
# generating the same data in parallel.
# This improves the performance for multiple requests.
if self._lock.locked() == "r":
lock_stack.enter_context(self._acquire_cache_lock("item"))
# Check if another process created the file in the meantime
cache_hash, uid, etag, text, tag, start, end = \
self._load_item_cache(href)
if input_hash != cache_hash:
try:
vobject_items = tuple(vobject.readComponents(