PyBitmessage-2021-04-27/src/storage/sqlite.py

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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__()
self._inventory = {} #of objects (like msg payloads and pubkey payloads) Does not include protocol headers (the first 24 bytes of each packet).
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._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]
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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<?',int(time.time()) - (60 * 60 * 3))
self._objects.clear()
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for objectHash, value in self._inventory.items():
self._objects[objectHash] = value.stream