runnig gag: forget adding files to your commit

1 files changed, 271 insertions, 0 deletions

diff --git a/module/DatabaseBackend.py b/module/DatabaseBackend.py
new file mode 100644
index 000000000..c93479565
--- /dev/null
+++ b/module/DatabaseBackend.py
@@ -0,0 +1,271 @@
+#!/usr/bin/env python
+"""
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License,
+    or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+    See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, see <http://www.gnu.org/licenses/>.
+
+    @author: RaNaN
+    @author: mkaay
+"""
+
+from threading import Lock
+from threading import Thread
+from threading import Event
+from os import remove
+from os.path import exists
+from shutil import move
+
+from Queue import Queue
+
+from traceback import print_exc
+
+try:
+    from pysqlite2 import dbapi2 as sqlite3
+except:
+    import sqlite3
+
+DB_VERSION = 4
+
+class style():
+    db = None
+    
+    @classmethod
+    def setDB(cls, db):
+        cls.db = db
+    
+    @classmethod
+    def inner(cls, f):
+        @staticmethod
+        def x(*args, **kwargs):
+            if cls.db:
+                return f(cls.db, *args[1:], **kwargs)
+        return x
+    
+    @classmethod
+    def queue(cls, f):
+        @staticmethod
+        def x(*args, **kwargs):
+            if cls.db:
+                return cls.db.queue(f, *args, **kwargs)
+        return x
+    
+    @classmethod
+    def async(cls, f):
+        @staticmethod
+        def x(*args, **kwargs):
+            if cls.db:
+                return cls.db.async(f, *args, **kwargs)
+        return x
+
+class DatabaseJob():
+    def __init__(self, f, *args, **kwargs):
+        self.done = Event()
+        
+        self.f = f
+        self.args = args
+        self.kwargs = kwargs
+        
+        self.result = None
+        self.exception = False
+    
+    def processJob(self):
+        try:
+            self.result = self.f(*self.args, **self.kwargs)
+        except Exception, e:
+            print "Database Error @", self.f.__name__, self.args[1:], self.kwargs, e
+            print_exc()
+            self.exception = e
+        self.done.set()
+    
+    def wait(self):
+        self.done.wait()
+
+class DatabaseBackend(Thread):
+    subs = []
+    def __init__(self, core):
+        Thread.__init__(self)
+        self.setDaemon(True)
+        self.core = core
+        
+        self.transactionLock = Lock()
+        self.jobs = Queue()
+        
+        self.setuplock = Event()
+        
+        style.setDB(self)
+    
+    def setup(self):
+        self.start()
+        self.setuplock.wait()
+    
+    def run(self):
+        """main loop, which executes commands"""
+        convert = self._checkVersion() #returns None or current version
+        
+        self.conn = sqlite3.connect("files.db")
+        self.c = self.conn.cursor() #compatibility
+        
+        if convert is not None:
+            self._convertDB(convert)
+        
+        self._createTables()
+        self.conn.commit()
+        
+        self.setuplock.set()
+        
+        while True:
+            j = self.jobs.get()
+            self.transactionLock.acquire()
+            if j == "quit":
+                break
+            j.processJob()
+            if j.exception:
+                self.conn.rollback()
+            else:
+                self.conn.commit()
+            self.transactionLock.release()
+
+    def shutdown(self):
+        self.syncSave()
+        self.jobs.put(("quit"))
+
+    def _checkVersion(self):
+        """ check db version and delete it if needed"""
+        if not exists("files.version"):
+            f = open("files.version", "wb")
+            f.write(str(DB_VERSION))
+            f.close()
+            return
+        
+        f = open("files.version", "rb")
+        v = int(f.read().strip())
+        f.close()
+        if v < DB_VERSION:
+            if v < 2:
+                self.manager.core.log.warning(_("Filedatabase was deleted due to incompatible version."))
+                remove("files.version")
+                move("files.db", "files.backup.db")
+            f = open("files.version", "wb")
+            f.write(str(DB_VERSION))
+            f.close()
+            return v
+    
+    def _convertDB(self, v):
+        try:
+            getattr(self, "_convertV%i" % v)()
+        except:
+            self.manager.core.log.error(_("Filedatabase could NOT be converted."))
+    
+    #--convert scripts start
+    
+    def _convertV2(self):
+        self.c.execute('CREATE TABLE IF NOT EXISTS "storage" ("id" INTEGER PRIMARY KEY AUTOINCREMENT, "identifier" TEXT NOT NULL, "key" TEXT NOT NULL, "value" TEXT DEFAULT "")')
+        self.manager.core.log.info(_("Database was converted from v2 to v3."))
+        self._convertV3(self)
+    
+    def _convertV3(self):
+        self.c.execute('CREATE TABLE IF NOT EXISTS "users" ("id" INTEGER PRIMARY KEY AUTOINCREMENT, "name" TEXT NOT NULL, "email" TEXT DEFAULT "" NOT NULL, "password" TEXT NOT NULL, "role" INTEGER DEFAULT 0 NOT NULL, "permission" INTEGER DEFAULT 0 NOT NULL, "template" TEXT DEFAULT "default" NOT NULL)')
+        self.manager.core.log.info(_("Database was converted from v3 to v2."))
+    
+    #--convert scripts end
+    
+    def _createTables(self):
+        """create tables for database"""
+
+        self.c.execute('CREATE TABLE IF NOT EXISTS "packages" ("id" INTEGER PRIMARY KEY AUTOINCREMENT, "name" TEXT NOT NULL, "folder" TEXT, "password" TEXT DEFAULT "", "site" TEXT DEFAULT "", "queue" INTEGER DEFAULT 0 NOT NULL, "packageorder" INTEGER DEFAULT 0 NOT NULL, "priority" INTEGER DEFAULT 0 NOT NULL)')
+        self.c.execute('CREATE TABLE IF NOT EXISTS "links" ("id" INTEGER PRIMARY KEY AUTOINCREMENT, "url" TEXT NOT NULL, "name" TEXT, "size" INTEGER DEFAULT 0 NOT NULL, "status" INTEGER DEFAULT 3 NOT NULL, "plugin" TEXT DEFAULT "BasePlugin" NOT NULL, "error" TEXT DEFAULT "", "linkorder" INTEGER DEFAULT 0 NOT NULL, "package" INTEGER DEFAULT 0 NOT NULL, FOREIGN KEY(package) REFERENCES packages(id))')
+        self.c.execute('CREATE INDEX IF NOT EXISTS "pIdIndex" ON links(package)')
+        self.c.execute('CREATE TABLE IF NOT EXISTS "storage" ("id" INTEGER PRIMARY KEY AUTOINCREMENT, "identifier" TEXT NOT NULL, "key" TEXT NOT NULL, "value" TEXT DEFAULT "")')
+        self.c.execute('CREATE TABLE IF NOT EXISTS "users" ("id" INTEGER PRIMARY KEY AUTOINCREMENT, "name" TEXT NOT NULL, "email" TEXT DEFAULT "" NOT NULL, "password" TEXT NOT NULL, "role" INTEGER DEFAULT 0 NOT NULL, "permission" INTEGER DEFAULT 0 NOT NULL, "template" TEXT DEFAULT "default" NOT NULL)')
+        self.c.execute('VACUUM')
+    
+    def createCursor(self):
+        return self.conn.cursor()
+    
+    @style.async
+    def commit(self):
+        self.conn.commit()
+    
+    @style.async
+    def rollback(self):
+        self.conn.rollback()
+    
+    def async(self, f, *args, **kwargs):
+        args = (self, ) + args
+        job = DatabaseJob(f, *args, **kwargs)
+        self.jobs.put(job)
+    
+    def queue(self, f, *args, **kwargs):
+        args = (self, ) + args
+        job = DatabaseJob(f, *args, **kwargs)
+        self.jobs.put(job)
+        job.wait()
+        return job.result
+    
+    @classmethod
+    def registerSub(cls, klass):
+        cls.subs.append(klass)
+    
+    @classmethod
+    def unregisterSub(cls, klass):
+        cls.subs.remove(klass)
+    
+    def __getattr__(self, attr):
+        for sub in DatabaseBackend.subs:
+            if hasattr(sub, attr):
+                return getattr(sub, attr)
+
+if __name__ == "__main__":
+    db = DatabaseBackend()
+    db.setup()
+    
+    class Test():
+        @style.queue
+        def insert(db):
+            c = db.createCursor()
+            for i in range(1000):
+                c.execute("INSERT INTO storage (identifier, key, value) VALUES (?, ?, ?)", ("foo", i, "bar"))
+        @style.async
+        def insert2(db):
+            c = db.createCursor()
+            for i in range(1000*1000):
+                c.execute("INSERT INTO storage (identifier, key, value) VALUES (?, ?, ?)", ("foo", i, "bar"))
+        
+        @style.queue
+        def select(db):
+            c = db.createCursor()
+            for i in range(10):
+                res = c.execute("SELECT value FROM storage WHERE identifier=? AND key=?", ("foo", i))
+                print res.fetchone()
+        
+        @style.queue
+        def error(db):
+            c = db.createCursor()
+            print "a"
+            c.execute("SELECT myerror FROM storage WHERE identifier=? AND key=?", ("foo", i))
+            print "e"
+    
+    db.registerSub(Test)
+    from time import time
+    start = time()
+    for i in range(100):
+        db.insert()
+    end = time()
+    print end-start
+    
+    start = time()
+    db.insert2()
+    end = time()
+    print end-start
+    
+    db.error()
+