85 lines
3.8 KiB
Python
85 lines
3.8 KiB
Python
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import collections
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from threading import RLock
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import time
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from helper_sql import *
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from singleton import Singleton
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inventoryLock = RLock() # Guarantees that two receiveDataThreads don't receive and process the same message concurrently (probably sent by a malicious individual)
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InventoryItem = collections.namedtuple('InventoryItem', 'type stream payload expires tag')
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@Singleton
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class Inventory(collections.MutableMapping):
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def __init__(self):
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super(self.__class__, self).__init__()
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self._inventory = {} #of objects (like msg payloads and pubkey payloads) Does not include protocol headers (the first 24 bytes of each packet).
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self.numberOfInventoryLookupsPerformed = 0
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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.
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def __contains__(self, hash):
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with inventoryLock:
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self.numberOfInventoryLookupsPerformed += 1
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if hash in self._inventory:
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return True
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return bool(sqlQuery('SELECT 1 FROM inventory WHERE hash=?', hash))
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def __getitem__(self, hash):
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with inventoryLock:
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if hash in self._inventory:
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return self._inventory[hash]
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rows = sqlQuery('SELECT objecttype, streamnumber, payload, expirestime, tag FROM inventory WHERE hash=?', hash)
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if not rows:
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raise KeyError(hash)
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return InventoryItem(*rows[0])
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def __setitem__(self, hash, value):
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with inventoryLock:
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value = InventoryItem(*value)
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self._inventory[hash] = value
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self._streams[value.stream].add(hash)
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def __delitem__(self, hash):
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raise NotImplementedError
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def __iter__(self):
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with inventoryLock:
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hashes = self._inventory.keys()[:]
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hashes += (hash for hash, in sqlQuery('SELECT hash FROM inventory'))
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return hashes.__iter__()
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def __len__(self):
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with inventoryLock:
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return len(self._inventory) + sqlQuery('SELECT count(*) FROM inventory')[0][0]
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def by_type_and_tag(self, type, tag):
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with inventoryLock:
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values = [value for value in self._inventory.values() if value.type == type and value.tag == tag]
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values += (InventoryItem(*value) for value in sqlQuery('SELECT objecttype, streamnumber, payload, expirestime, tag FROM inventory WHERE objecttype=? AND tag=?', type, tag))
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return values
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def hashes_by_stream(self, stream):
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with inventoryLock:
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return self._streams[stream]
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def unexpired_hashes_by_stream(self, stream):
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with inventoryLock:
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t = int(time.time())
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hashes = [hash for hash, value in self._inventory.items() if value.stream == stream and value.expires > t]
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hashes += (payload for payload, in sqlQuery('SELECT hash FROM inventory WHERE streamnumber=? AND expirestime>?', stream, t))
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return hashes
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def flush(self):
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with inventoryLock: # If you use both the inventoryLock and the sqlLock, always use the inventoryLock OUTSIDE of the sqlLock.
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with SqlBulkExecute() as sql:
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for hash, value in self._inventory.items():
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sql.execute('INSERT INTO inventory VALUES (?, ?, ?, ?, ?, ?)', hash, *value)
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self._inventory.clear()
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def clean(self):
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with inventoryLock:
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sqlExecute('DELETE FROM inventory WHERE expirestime<?',int(time.time()) - (60 * 60 * 3))
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self._streams.clear()
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for hash, value in self.items():
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self._streams[value.stream].add(hash)
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