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361 lines
12 KiB
Python
361 lines
12 KiB
Python
# Author: Nic Wolfe <nic@wolfeden.ca>
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# URL: http://code.google.com/p/sickbeard/
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#
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# This file is part of SickRage.
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#
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# SickRage is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# SickRage is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with SickRage. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import with_statement
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import os.path
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import re
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import sqlite3
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import time
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import threading
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import sickbeard
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from sickbeard import encodingKludge as ek
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from sickbeard import logger
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from sickbeard.exceptions import ex
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db_lock = threading.Lock()
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def dbFilename(filename="sickbeard.db", suffix=None):
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"""
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@param filename: The sqlite database filename to use. If not specified,
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will be made to be sickbeard.db
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@param suffix: The suffix to append to the filename. A '.' will be added
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automatically, i.e. suffix='v0' will make dbfile.db.v0
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@return: the correct location of the database file.
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"""
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if suffix:
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filename = "%s.%s" % (filename, suffix)
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return ek.ek(os.path.join, sickbeard.DATA_DIR, filename)
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class DBConnection(object):
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def __init__(self, filename="sickbeard.db", suffix=None, row_type=None):
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self.filename = filename
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self.suffix = suffix
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self.row_type = row_type
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self.connection = None
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try:
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self.reconnect()
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except Exception as e:
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logger.log(u"DB error: " + ex(e), logger.ERROR)
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raise
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def reconnect(self):
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"""Closes the existing database connection and re-opens it."""
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self.close()
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self.connection = sqlite3.connect(dbFilename(self.filename, self.suffix), 20, check_same_thread=False)
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self.connection.isolation_level = None
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if self.row_type == "dict":
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self.connection.row_factory = self._dict_factory
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else:
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self.connection.row_factory = sqlite3.Row
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def __del__(self):
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self.close()
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def _cursor(self):
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"""Returns the cursor; reconnects if disconnected."""
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if self.connection is None: self.reconnect()
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return self.connection.cursor()
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def execute(self, query, args=None, fetchall=False, fetchone=False):
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"""Executes the given query, returning the lastrowid from the query."""
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cursor = self._cursor()
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try:
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if fetchall:
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return self._execute(cursor, query, args).fetchall()
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elif fetchone:
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return self._execute(cursor, query, args).fetchone()
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else:
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return self._execute(cursor, query, args)
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finally:
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cursor.close()
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def _execute(self, cursor, query, args):
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try:
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if args == None:
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return cursor.execute(query)
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return cursor.execute(query, args)
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except sqlite3.OperationalError as e:
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logger.log(u"DB error: " + ex(e), logger.ERROR)
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self.close()
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raise
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def checkDBVersion(self):
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result = None
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try:
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if self.hasTable('db_version'):
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result = self.select("SELECT db_version FROM db_version")
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except:
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return 0
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if result:
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return int(result[0]["db_version"])
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else:
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return 0
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def mass_action(self, querylist, logTransaction=False):
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with db_lock:
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# remove None types
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querylist = [i for i in querylist if i != None]
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if querylist == None:
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return
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sqlResult = []
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attempt = 0
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while attempt < 5:
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try:
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for qu in querylist:
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if len(qu) == 1:
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if logTransaction:
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logger.log(qu[0], logger.DEBUG)
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sqlResult.append(self.execute(qu[0]))
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elif len(qu) > 1:
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if logTransaction:
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logger.log(qu[0] + " with args " + str(qu[1]), logger.DEBUG)
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sqlResult.append(self.execute(qu[0], qu[1]))
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logger.log(u"Transaction with " + str(len(querylist)) + u" queries executed", logger.DEBUG)
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# finished
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break
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except sqlite3.OperationalError, e:
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sqlResult = []
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if self.connection:
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self.connection.rollback()
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if "unable to open database file" in e.args[0] or "database is locked" in e.args[0]:
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logger.log(u"DB error: " + ex(e), logger.WARNING)
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attempt += 1
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time.sleep(1)
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else:
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logger.log(u"DB error: " + ex(e), logger.ERROR)
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raise
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except sqlite3.DatabaseError, e:
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sqlResult = []
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if self.connection:
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self.connection.rollback()
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logger.log(u"Fatal error executing query: " + ex(e), logger.ERROR)
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raise
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time.sleep(0.05)
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return sqlResult
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def action(self, query, args=None, fetchall=False, fetchone=False):
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with db_lock:
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if query == None:
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return
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sqlResult = None
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attempt = 0
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while attempt < 5:
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try:
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if args == None:
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logger.log(self.filename + ": " + query, logger.DB)
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else:
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logger.log(self.filename + ": " + query + " with args " + str(args), logger.DB)
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sqlResult = self.execute(query, args, fetchall=fetchall, fetchone=fetchone)
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# get out of the connection attempt loop since we were successful
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break
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except sqlite3.OperationalError, e:
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if "unable to open database file" in e.args[0] or "database is locked" in e.args[0]:
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logger.log(u"DB error: " + ex(e), logger.WARNING)
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attempt += 1
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time.sleep(1)
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else:
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logger.log(u"DB error: " + ex(e), logger.ERROR)
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raise
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except sqlite3.DatabaseError, e:
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logger.log(u"Fatal error executing query: " + ex(e), logger.ERROR)
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raise
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time.sleep(0.05)
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return sqlResult
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def select(self, query, args=None):
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sqlResults = self.action(query, args, fetchall=True)
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if sqlResults == None:
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return []
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return sqlResults
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def selectOne(self, query, args=None):
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sqlResults = self.action(query, args, fetchone=True)
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if sqlResults == None:
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return []
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return sqlResults
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def upsert(self, tableName, valueDict, keyDict):
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changesBefore = self.connection.total_changes
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genParams = lambda myDict: [x + " = ?" for x in myDict.keys()]
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query = "UPDATE " + tableName + " SET " + ", ".join(genParams(valueDict)) + " WHERE " + " AND ".join(
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genParams(keyDict))
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self.action(query, valueDict.values() + keyDict.values())
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if self.connection.total_changes == changesBefore:
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query = "INSERT INTO " + tableName + " (" + ", ".join(valueDict.keys() + keyDict.keys()) + ")" + \
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" VALUES (" + ", ".join(["?"] * len(valueDict.keys() + keyDict.keys())) + ")"
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self.action(query, valueDict.values() + keyDict.values())
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def tableInfo(self, tableName):
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# FIXME ? binding is not supported here, but I cannot find a way to escape a string manually
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sqlResult = self.select("PRAGMA table_info(%s)" % tableName)
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columns = {}
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for column in sqlResult:
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columns[column['name']] = {'type': column['type']}
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return columns
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# http://stackoverflow.com/questions/3300464/how-can-i-get-dict-from-sqlite-query
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def _dict_factory(self, cursor, row):
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d = {}
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for idx, col in enumerate(cursor.description):
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d[col[0]] = row[idx]
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return d
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def hasTable(self, tableName):
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return len(self.select("SELECT 1 FROM sqlite_master WHERE name = ?;", (tableName, ))) > 0
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def hasColumn(self, tableName, column):
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return column in self.tableInfo(tableName)
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def addColumn(self, table, column, type="NUMERIC", default=0):
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self.action("ALTER TABLE %s ADD %s %s" % (table, column, type))
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self.action("UPDATE %s SET %s = ?" % (table, column), (default,))
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def close(self):
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"""Close database connection"""
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if getattr(self, "connection", None) is not None:
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self.connection.close()
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self.connection = None
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def sanityCheckDatabase(connection, sanity_check):
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sanity_check(connection).check()
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class DBSanityCheck(object):
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def __init__(self, connection):
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self.connection = connection
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def check(self):
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pass
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# ===============
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# = Upgrade API =
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# ===============
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def upgradeDatabase(connection, schema):
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logger.log(u"Checking database structure...", logger.MESSAGE)
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_processUpgrade(connection, schema)
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def prettyName(class_name):
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return ' '.join([x.group() for x in re.finditer("([A-Z])([a-z0-9]+)", class_name)])
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def restoreDatabase(version):
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logger.log(u"Restoring database before trying upgrade again")
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if not sickbeard.helpers.restoreVersionedFile(dbFilename(suffix='v' + str(version)), version):
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logger.log_error_and_exit(u"Database restore failed, abort upgrading database")
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return False
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else:
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return True
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def _processUpgrade(connection, upgradeClass):
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instance = upgradeClass(connection)
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logger.log(u"Checking " + prettyName(upgradeClass.__name__) + " database upgrade", logger.DEBUG)
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if not instance.test():
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logger.log(u"Database upgrade required: " + prettyName(upgradeClass.__name__), logger.MESSAGE)
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try:
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instance.execute()
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except sqlite3.DatabaseError, e:
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# attemping to restore previous DB backup and perform upgrade
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try:
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instance.execute()
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except:
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restored = False
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result = connection.select("SELECT db_version FROM db_version")
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if result:
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version = int(result[0]["db_version"])
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if restoreDatabase(version):
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# initialize the main SB database
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upgradeDatabase(DBConnection(), sickbeard.mainDB.InitialSchema)
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restored = True
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if not restored:
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print "Error in " + str(upgradeClass.__name__) + ": " + ex(e)
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raise
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logger.log(upgradeClass.__name__ + " upgrade completed", logger.DEBUG)
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else:
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logger.log(upgradeClass.__name__ + " upgrade not required", logger.DEBUG)
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for upgradeSubClass in upgradeClass.__subclasses__():
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_processUpgrade(connection, upgradeSubClass)
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# Base migration class. All future DB changes should be subclassed from this class
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class SchemaUpgrade(object):
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def __init__(self, connection):
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self.connection = connection
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def hasTable(self, tableName):
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return len(self.connection.select("SELECT 1 FROM sqlite_master WHERE name = ?;", (tableName, ))) > 0
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def hasColumn(self, tableName, column):
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return column in self.connection.tableInfo(tableName)
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def addColumn(self, table, column, type="NUMERIC", default=0):
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self.connection.action("ALTER TABLE %s ADD %s %s" % (table, column, type))
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self.connection.action("UPDATE %s SET %s = ?" % (table, column), (default,))
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def checkDBVersion(self):
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return self.connection.checkDBVersion()
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def incDBVersion(self):
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new_version = self.checkDBVersion() + 1
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self.connection.action("UPDATE db_version SET db_version = ?", [new_version])
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return new_version
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