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115 lines
3.6 KiB
Python
115 lines
3.6 KiB
Python
#!/usr/bin/env python
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"""
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$Id$
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Copyright (c) 2006-2011 sqlmap developers (http://www.sqlmap.org/)
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See the file 'doc/COPYING' for copying permission
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"""
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import hashlib
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import sqlite3
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import threading
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from lib.core.data import conf
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from lib.core.settings import HASHDB_FLUSH_THRESHOLD
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from lib.core.settings import UNICODE_ENCODING
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from lib.core.threads import getCurrentThreadData
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from lib.core.threads import getCurrentThreadName
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class HashDB(object):
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def __init__(self, filepath):
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self.filepath = filepath
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self._write_cache = {}
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self._cache_lock = threading.Lock()
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def _get_cursor(self):
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threadData = getCurrentThreadData()
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if threadData.hashDBCursor is None:
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connection = sqlite3.connect(self.filepath, timeout=3, isolation_level=None)
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threadData.hashDBCursor = connection.cursor()
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threadData.hashDBCursor.execute("CREATE TABLE IF NOT EXISTS storage (id INTEGER PRIMARY KEY, value TEXT)")
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return threadData.hashDBCursor
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cursor = property(_get_cursor)
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def close(self):
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threadData = getCurrentThreadData()
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try:
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if threadData.hashDBCursor:
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threadData.hashDBCursor.close()
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threadData.hashDBCursor.connection.close()
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threadData.hashDBCursor = None
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except:
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pass
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@staticmethod
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def hashKey(key):
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key = key.encode(UNICODE_ENCODING) if isinstance(key, unicode) else repr(key)
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retVal = int(hashlib.md5(key).hexdigest()[:8], 16)
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return retVal
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def retrieve(self, key):
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retVal = None
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if key:
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hash_ = HashDB.hashKey(key)
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retVal = self._write_cache.get(hash_, None)
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if not retVal:
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while True:
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try:
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for row in self.cursor.execute("SELECT value FROM storage WHERE id=?", (hash_,)):
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retVal = row[0]
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except sqlite3.OperationalError, ex:
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if not 'locked' in ex.message:
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raise
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else:
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break
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return retVal
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def write(self, key, value):
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if key:
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hash_ = HashDB.hashKey(key)
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self._cache_lock.acquire()
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self._write_cache[hash_] = value
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self._cache_lock.release()
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if getCurrentThreadName() in ('0', 'MainThread'):
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self.flush()
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def flush(self, forced=False):
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if not self._write_cache:
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return
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if not forced and len(self._write_cache) < HASHDB_FLUSH_THRESHOLD:
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return
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self._cache_lock.acquire()
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items = self._write_cache.items()
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self._write_cache.clear()
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self._cache_lock.release()
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try:
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self.beginTransaction()
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for hash_, value in items:
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while True:
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try:
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try:
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self.cursor.execute("INSERT INTO storage VALUES (?, ?)", (hash_, value,))
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except sqlite3.IntegrityError:
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self.cursor.execute("UPDATE storage SET value=? WHERE id=?", (value, hash_,))
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except sqlite3.OperationalError, ex:
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if not 'locked' in ex.message:
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raise
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else:
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break
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finally:
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self.endTransaction()
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def beginTransaction(self):
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self.cursor.execute('BEGIN TRANSACTION')
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def endTransaction(self):
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self.cursor.execute('END TRANSACTION')
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