Peter Surda e84b19613e
Inventory refactoring
- minor refactoring, made it into singleton instead of a shared global
  variable. This makes it a little bit cleaner and moves the class into
a separate file
- removed duplicate inventory locking
- renamed to (this is the code that
  ensures only one instance of PyBitmessage runs at the same time)
2017-01-10 21:15:35 +01:00

85 lines
3.8 KiB

import collections
from threading import RLock
import time
from helper_sql import *
from singleton import Singleton
inventoryLock = RLock() # Guarantees that two receiveDataThreads don't receive and process the same message concurrently (probably sent by a malicious individual)
InventoryItem = collections.namedtuple('InventoryItem', 'type stream payload expires tag')
class Inventory(collections.MutableMapping):
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.numberOfInventoryLookupsPerformed = 0
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.
def __contains__(self, hash):
with inventoryLock:
self.numberOfInventoryLookupsPerformed += 1
if hash in self._inventory:
return True
return bool(sqlQuery('SELECT 1 FROM inventory WHERE hash=?', hash))
def __getitem__(self, hash):
with inventoryLock:
if hash in self._inventory:
return self._inventory[hash]
rows = sqlQuery('SELECT objecttype, streamnumber, payload, expirestime, tag FROM inventory WHERE hash=?', hash)
if not rows:
raise KeyError(hash)
return InventoryItem(*rows[0])
def __setitem__(self, hash, value):
with inventoryLock:
value = InventoryItem(*value)
self._inventory[hash] = value
def __delitem__(self, hash):
raise NotImplementedError
def __iter__(self):
with inventoryLock:
hashes = self._inventory.keys()[:]
hashes += (hash for hash, in sqlQuery('SELECT hash FROM inventory'))
return hashes.__iter__()
def __len__(self):
with inventoryLock:
return len(self._inventory) + sqlQuery('SELECT count(*) FROM inventory')[0][0]
def by_type_and_tag(self, type, tag):
with inventoryLock:
values = [value for value in self._inventory.values() if value.type == type and value.tag == tag]
values += (InventoryItem(*value) for value in sqlQuery('SELECT objecttype, streamnumber, payload, expirestime, tag FROM inventory WHERE objecttype=? AND tag=?', type, tag))
return values
def hashes_by_stream(self, stream):
with inventoryLock:
return self._streams[stream]
def unexpired_hashes_by_stream(self, stream):
with inventoryLock:
t = int(time.time())
hashes = [hash for hash, value in self._inventory.items() if == stream and value.expires > t]
hashes += (payload for payload, in sqlQuery('SELECT hash FROM inventory WHERE streamnumber=? AND expirestime>?', stream, t))
return hashes
def flush(self):
with inventoryLock: # If you use both the inventoryLock and the sqlLock, always use the inventoryLock OUTSIDE of the sqlLock.
with SqlBulkExecute() as sql:
for hash, value in self._inventory.items():
sql.execute('INSERT INTO inventory VALUES (?, ?, ?, ?, ?, ?)', hash, *value)
def clean(self):
with inventoryLock:
sqlExecute('DELETE FROM inventory WHERE expirestime<?',int(time.time()) - (60 * 60 * 3))
for hash, value in self.items():