Inventory checking performance optimisation

- caching of whether an object exists in inventory was somehow removed
since storage refactoring (or it never worked). Now existence checking
is cached in the sqlite storage backend
This commit is contained in:
Peter Šurda 2018-02-02 14:33:29 +01:00
parent 053f434e04
commit 96b8cff0d1
Signed by untrusted user: PeterSurda
GPG Key ID: 0C5F50C0B5F37D87
2 changed files with 10 additions and 13 deletions

View File

@ -11,14 +11,18 @@ class SqliteInventory(InventoryStorage):
def __init__(self):
super(self.__class__, self).__init__()
self._inventory = {} #of objects (like msg payloads and pubkey payloads) Does not include protocol headers (the first 24 bytes of each packet).
self._streams = collections.defaultdict(set) # key = streamNumer, value = a set which holds the inventory object hashes that we are aware of. This is used whenever we receive an inv message from a peer to check to see what items are new to us. We don't delete things out of it; instead, the singleCleaner thread clears and refills it every couple hours.
self._objects = {} # cache for existing objects, used for quick lookups if we have an object. This is used for example whenever we receive an inv message from a peer to check to see what items are new to us. We don't delete things out of it; instead, the singleCleaner thread clears and refills it.
self.lock = RLock() # Guarantees that two receiveDataThreads don't receive and process the same message concurrently (probably sent by a malicious individual)
def __contains__(self, hash):
with self.lock:
if hash in self._inventory:
if hash in self._objects:
return True
rows = sqlQuery('SELECT streamnumber FROM inventory WHERE hash=?', sqlite3.Binary(hash))
if not rows:
return False
self._objects[hash] = rows[0][0]
return True
return bool(sqlQuery('SELECT 1 FROM inventory WHERE hash=?', sqlite3.Binary(hash)))
def __getitem__(self, hash):
with self.lock:
@ -33,7 +37,7 @@ class SqliteInventory(InventoryStorage):
with self.lock:
value = InventoryItem(*value)
self._inventory[hash] = value
self._streams[value.stream].add(hash)
self._objects[hash] = value.stream
def __delitem__(self, hash):
raise NotImplementedError
@ -54,10 +58,6 @@ class SqliteInventory(InventoryStorage):
values += (InventoryItem(*value) for value in sqlQuery('SELECT objecttype, streamnumber, payload, expirestime, tag FROM inventory WHERE objecttype=? AND tag=?', objectType, sqlite3.Binary(tag)))
return values
def hashes_by_stream(self, stream):
with self.lock:
return self._streams[stream]
def unexpired_hashes_by_stream(self, stream):
with self.lock:
t = int(time.time())
@ -75,7 +75,7 @@ class SqliteInventory(InventoryStorage):
def clean(self):
with self.lock:
sqlExecute('DELETE FROM inventory WHERE expirestime<?',int(time.time()) - (60 * 60 * 3))
self._streams.clear()
self._objects.clear()
for objectHash, value in self._inventory.items():
self._streams[value.stream].add(objectHash)
self._objects[objectHash] = value.stream

View File

@ -33,9 +33,6 @@ class InventoryStorage(Storage, collections.MutableMapping):
def by_type_and_tag(self, objectType, tag):
raise NotImplementedError
def hashes_by_stream(self, stream):
raise NotImplementedError
def unexpired_hashes_by_stream(self, stream):
raise NotImplementedError