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Sqlite Inventory
import sqlite3
import time
from threading import RLock
from helper_sql import sqlQuery, SqlBulkExecute, sqlExecute
from storage import InventoryStorage, InventoryItem
class SqliteInventory(InventoryStorage): # pylint: disable=too-many-ancestors
"""Inventory using SQLite"""
def __init__(self):
super(SqliteInventory, 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=?',
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_] =
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):
"""Return objects filtered by object type and 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):
"""Return unexpired inventory vectors filtered by stream"""
with self.lock:
t = int(time.time())
hashes = [x for x, value in self._inventory.items()
if == 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):
"""Flush cache"""
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():
'INSERT INTO inventory VALUES (?, ?, ?, ?, ?, ?)',
sqlite3.Binary(objectHash), *value)
def clean(self):
"""Free memory / perform garbage collection"""
with self.lock:
'DELETE FROM inventory WHERE expirestime<?',
int(time.time()) - (60 * 60 * 3))
for objectHash, value in self._inventory.items():
self._objects[objectHash] =