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142 lines
4.2 KiB
Python
142 lines
4.2 KiB
Python
# Created By: Virgil Dupras
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# Created On: 2007/05/19
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# Copyright 2014 Hardcoded Software (http://www.hardcoded.net)
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# This software is licensed under the "BSD" License as described in the "LICENSE" file,
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# which should be included with this package. The terms are also available at
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# http://www.hardcoded.net/licenses/bsd_license
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import sys
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import os
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import os.path as op
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import threading
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from queue import Queue
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import time
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import sqlite3 as sqlite
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STOP = object()
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COMMIT = object()
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ROLLBACK = object()
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class FakeCursor(list):
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# It's not possible to use sqlite cursors on another thread than the connection. Thus,
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# we can't directly return the cursor. We have to fatch all results, and support its interface.
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def fetchall(self):
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return self
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def fetchone(self):
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try:
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return self.pop(0)
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except IndexError:
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return None
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class _ActualThread(threading.Thread):
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''' We can't use this class directly because thread object are not automatically freed when
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nothing refers to it, making it hang the application if not explicitely closed.
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'''
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def __init__(self, dbname, autocommit):
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threading.Thread.__init__(self)
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self._queries = Queue()
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self._results = Queue()
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self._dbname = dbname
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self._autocommit = autocommit
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self._waiting_list = set()
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self._lock = threading.Lock()
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self._run = True
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self.lastrowid = -1
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self.setDaemon(True)
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self.start()
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def _query(self, query):
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with self._lock:
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wait_token = object()
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self._waiting_list.add(wait_token)
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self._queries.put(query)
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self._waiting_list.remove(wait_token)
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result = self._results.get()
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return result
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def close(self):
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if not self._run:
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return
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self._query(STOP)
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def commit(self):
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if not self._run:
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return None # Connection closed
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self._query(COMMIT)
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def execute(self, sql, values=()):
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if not self._run:
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return None # Connection closed
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result = self._query((sql, values))
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if isinstance(result, Exception):
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raise result
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return result
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def rollback(self):
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if not self._run:
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return None # Connection closed
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self._query(ROLLBACK)
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def run(self):
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# The whole chdir thing is because sqlite doesn't handle directory names with non-asci char in the AT ALL.
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oldpath = os.getcwd()
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dbdir, dbname = op.split(self._dbname)
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if dbdir:
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os.chdir(dbdir)
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if self._autocommit:
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con = sqlite.connect(dbname, isolation_level=None)
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else:
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con = sqlite.connect(dbname)
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os.chdir(oldpath)
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while self._run or self._waiting_list:
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query = self._queries.get()
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result = None
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if query is STOP:
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self._run = False
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elif query is COMMIT:
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con.commit()
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elif query is ROLLBACK:
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con.rollback()
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else:
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sql, values = query
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try:
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cur = con.execute(sql, values)
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self.lastrowid = cur.lastrowid
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result = FakeCursor(cur.fetchall())
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result.lastrowid = cur.lastrowid
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except Exception as e:
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result = e
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self._results.put(result)
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con.close()
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class ThreadedConn:
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"""``sqlite`` connections can't be used across threads. ``TheadedConn`` opens a sqlite
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connection in its own thread and sends it queries through a queue, making it suitable in
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multi-threaded environment.
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"""
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def __init__(self, dbname, autocommit):
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self._t = _ActualThread(dbname, autocommit)
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self.lastrowid = -1
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def __del__(self):
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self.close()
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def close(self):
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self._t.close()
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def commit(self):
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self._t.commit()
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def execute(self, sql, values=()):
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result = self._t.execute(sql, values)
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self.lastrowid = self._t.lastrowid
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return result
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def rollback(self):
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self._t.rollback()
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