cis-kuldeep/PyBitmessage-2021-04-27
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use locks when accessing dictionary inventory

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This commit is contained in:
Jonathan Warren 2013-09-07 18:23:20 -04:00
parent 831edf0d24
commit f0bf3aad48
3 changed files with 29 additions and 19 deletions
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2
src/class_objectHashHolder.py
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@ -1,5 +1,5 @@
# objectHashHolder is a timer-driven thread. One objectHashHolder thread is used # objectHashHolder is a timer-driven thread. One objectHashHolder thread is used
# by each sendDataThread. It uses it whenever a sendDataThread needs to # by each sendDataThread. The sendDataThread uses it whenever it needs to
# advertise an object to peers. Instead of sending it out immediately, it must # advertise an object to peers. Instead of sending it out immediately, it must
# wait a random number of seconds for each connection so that different peers # wait a random number of seconds for each connection so that different peers
# get different objects at different times. Thus an attacker who is # get different objects at different times. Thus an attacker who is

14
src/class_receiveDataThread.py
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@ -298,11 +298,12 @@ class receiveDataThread(threading.Thread):
bigInvList[hash] = 0 bigInvList[hash] = 0
# We also have messages in our inventory in memory (which is a python # We also have messages in our inventory in memory (which is a python
# dictionary). Let's fetch those too. # dictionary). Let's fetch those too.
for hash, storedValue in shared.inventory.items(): with shared.inventoryLock:
if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware: for hash, storedValue in shared.inventory.items():
objectType, streamNumber, payload, receivedTime = storedValue if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware:
if streamNumber == self.streamNumber and receivedTime > int(time.time()) - shared.maximumAgeOfObjectsThatIAdvertiseToOthers: objectType, streamNumber, payload, receivedTime = storedValue
bigInvList[hash] = 0 if streamNumber == self.streamNumber and receivedTime > int(time.time()) - shared.maximumAgeOfObjectsThatIAdvertiseToOthers:
bigInvList[hash] = 0
numberOfObjectsInInvMessage = 0 numberOfObjectsInInvMessage = 0
payload = '' payload = ''
# Now let us start appending all of these hashes together. They will be # Now let us start appending all of these hashes together. They will be
@ -1496,11 +1497,14 @@ class receiveDataThread(threading.Thread):
print 'received getdata request for item:', hash.encode('hex') print 'received getdata request for item:', hash.encode('hex')
shared.numberOfInventoryLookupsPerformed += 1 shared.numberOfInventoryLookupsPerformed += 1
shared.inventoryLock.acquire()
if hash in shared.inventory: if hash in shared.inventory:
objectType, streamNumber, payload, receivedTime = shared.inventory[ objectType, streamNumber, payload, receivedTime = shared.inventory[
hash] hash]
shared.inventoryLock.release()
self.sendData(objectType, payload) self.sendData(objectType, payload)
else: else:
shared.inventoryLock.release()
queryreturn = sqlQuery( queryreturn = sqlQuery(
'''select objecttype, payload from inventory where hash=?''', '''select objecttype, payload from inventory where hash=?''',
hash) hash)

32
src/class_singleCleaner.py
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@ -32,19 +32,20 @@ class singleCleaner(threading.Thread):
shared.UISignalQueue.put(( shared.UISignalQueue.put((
'updateStatusBar', 'Doing housekeeping (Flushing inventory in memory to disk...)')) 'updateStatusBar', 'Doing housekeeping (Flushing inventory in memory to disk...)'))
with SqlBulkExecute() as sql: with shared.inventoryLock: # If you use both the inventoryLock and the sqlLock, always use the inventoryLock OUTSIDE of the sqlLock.
for hash, storedValue in shared.inventory.items(): with SqlBulkExecute() as sql:
objectType, streamNumber, payload, receivedTime = storedValue for hash, storedValue in shared.inventory.items():
if int(time.time()) - 3600 > receivedTime: objectType, streamNumber, payload, receivedTime = storedValue
sql.execute( if int(time.time()) - 3600 > receivedTime:
'''INSERT INTO inventory VALUES (?,?,?,?,?,?)''', sql.execute(
hash, '''INSERT INTO inventory VALUES (?,?,?,?,?,?)''',
objectType, hash,
streamNumber, objectType,
payload, streamNumber,
receivedTime, payload,
'') receivedTime,
del shared.inventory[hash] '')
del shared.inventory[hash]
shared.UISignalQueue.put(('updateStatusBar', '')) shared.UISignalQueue.put(('updateStatusBar', ''))
shared.broadcastToSendDataQueues(( shared.broadcastToSendDataQueues((
0, 'pong', 'no data')) # commands the sendData threads to send out a pong message if they haven't sent anything else in the last five minutes. The socket timeout-time is 10 minutes. 0, 'pong', 'no data')) # commands the sendData threads to send out a pong message if they haven't sent anything else in the last five minutes. The socket timeout-time is 10 minutes.
@ -118,4 +119,9 @@ class singleCleaner(threading.Thread):
queryData = sqlQuery('''SELECT hash FROM inventory WHERE streamnumber=?''', streamNumber) queryData = sqlQuery('''SELECT hash FROM inventory WHERE streamnumber=?''', streamNumber)
for row in queryData: for row in queryData:
shared.inventorySets[streamNumber].add(row[0]) shared.inventorySets[streamNumber].add(row[0])
with shared.inventoryLock:
for hash, storedValue in shared.inventory.items():
objectType, streamNumber, payload, receivedTime = storedValue
if streamNumber in shared.inventorySets:
shared.inventorySets[streamNumber].add(hash)
time.sleep(300) time.sleep(300)