import collections from threading import current_thread, enumerate as threadingEnumerate, RLock import Queue import sqlite3 import time from helper_sql import * from storage import InventoryStorage, InventoryItem class SqliteInventory(InventoryStorage): def __init__(self): super(self.__class__, self).__init__() # of objects (like msg payloads and pubkey payloads) # Does not include protocol headers (the first 24 bytes of each packet). self._inventory = {} # 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._objects = {} # Guarantees that two receiveDataThreads don't receive and process the same message concurrently # (probably sent by a malicious individual) self.lock = RLock() def __contains__(self, hash): with self.lock: 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 def __getitem__(self, hash): with self.lock: if hash in self._inventory: return self._inventory[hash] rows = sqlQuery('SELECT objecttype, streamnumber, payload, expirestime, tag FROM inventory WHERE hash=?', sqlite3.Binary(hash)) if not rows: raise KeyError(hash) return InventoryItem(*rows[0]) def __setitem__(self, hash, value): with self.lock: value = InventoryItem(*value) self._inventory[hash] = value self._objects[hash] = value.stream def __delitem__(self, hash): raise NotImplementedError def __iter__(self): with self.lock: hashes = self._inventory.keys()[:] hashes += (x for x, in sqlQuery('SELECT hash FROM inventory')) return hashes.__iter__() def __len__(self): with self.lock: return len(self._inventory) + sqlQuery('SELECT count(*) FROM inventory')[0][0] def by_type_and_tag(self, objectType, tag): with self.lock: values = [value for value in self._inventory.values() if value.type == objectType and value.tag == tag] 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 unexpired_hashes_by_stream(self, stream): with self.lock: t = int(time.time()) hashes = [x for x, value in self._inventory.items() if value.stream == stream and value.expires > t] hashes += (str(payload) for payload, in sqlQuery('SELECT hash FROM inventory WHERE streamnumber=? AND expirestime>?', stream, t)) return hashes def flush(self): with self.lock: # If you use both the inventoryLock and the sqlLock, always use the inventoryLock OUTSIDE of the sqlLock. with SqlBulkExecute() as sql: for objectHash, value in self._inventory.items(): sql.execute('INSERT INTO inventory VALUES (?, ?, ?, ?, ?, ?)', sqlite3.Binary(objectHash), *value) self._inventory.clear() def clean(self): with self.lock: sqlExecute('DELETE FROM inventory WHERE expirestime