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SickRage/sickbeard/db.py

313 lines
11 KiB
Python

# Author: Nic Wolfe <nic@wolfeden.ca>
# URL: http://code.google.com/p/sickbeard/
#
# This file is part of SickRage.
#
# SickRage 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.
#
# SickRage 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 SickRage. If not, see <http://www.gnu.org/licenses/>.
from __future__ import with_statement
import os.path
import re
import sqlite3
import time
import threading
import sickbeard
from sickbeard import encodingKludge as ek
from sickbeard import logger
from sickbeard.exceptions import ex
from sickbeard.common import cpu_presets
from itertools import ifilter
db_lock = threading.Lock()
def dbFilename(filename="sickbeard.db", suffix=None):
"""
@param filename: The sqlite database filename to use. If not specified,
will be made to be sickbeard.db
@param suffix: The suffix to append to the filename. A '.' will be added
automatically, i.e. suffix='v0' will make dbfile.db.v0
@return: the correct location of the database file.
"""
if suffix:
filename = "%s.%s" % (filename, suffix)
return ek.ek(os.path.join, sickbeard.DATA_DIR, filename)
class DBConnection:
def __init__(self, filename="sickbeard.db", suffix=None, row_type=None):
self.filename = filename
self.connection = sqlite3.connect(dbFilename(filename), 20)
if row_type == "dict":
self.connection.row_factory = self._dict_factory
else:
self.connection.row_factory = sqlite3.Row
def checkDBVersion(self):
result = None
try:
result = self.select("SELECT db_version FROM db_version")
except sqlite3.OperationalError, e:
if "no such table: db_version" in e.args[0]:
return 0
if result:
return int(result[0]["db_version"])
else:
return 0
def fetch(self, query, args=None):
with db_lock:
if query == None:
return
sqlResult = None
attempt = 0
while attempt < 5:
try:
if args == None:
logger.log(self.filename + ": " + query, logger.DB)
cursor = self.connection.cursor()
cursor.execute(query)
sqlResult = cursor.fetchone()[0]
else:
logger.log(self.filename + ": " + query + " with args " + str(args), logger.DB)
cursor = self.connection.cursor()
cursor.execute(query, args)
sqlResult = cursor.fetchone()[0]
# get out of the connection attempt loop since we were successful
break
except sqlite3.OperationalError, e:
if "unable to open database file" in e.args[0] or "database is locked" in e.args[0]:
logger.log(u"DB error: " + ex(e), logger.WARNING)
attempt += 1
time.sleep(cpu_presets[sickbeard.CPU_PRESET])
else:
logger.log(u"DB error: " + ex(e), logger.ERROR)
raise
except sqlite3.DatabaseError, e:
logger.log(u"Fatal error executing query: " + ex(e), logger.ERROR)
raise
return sqlResult
def mass_action(self, querylist, logTransaction=False):
with db_lock:
# remove None types
querylist = [i for i in querylist if i!=None]
if querylist == None:
return
sqlResult = []
attempt = 0
# Transaction
self.connection.isolation_level = None
self.connection.execute('begin')
while attempt < 5:
try:
for qu in querylist:
if len(qu) == 1:
if logTransaction:
logger.log(qu[0], logger.DEBUG)
sqlResult.append(self.connection.execute(qu[0]))
elif len(qu) > 1:
if logTransaction:
logger.log(qu[0] + " with args " + str(qu[1]), logger.DEBUG)
sqlResult.append(self.connection.execute(qu[0], qu[1]))
self.connection.execute('commit')
logger.log(u"Transaction with " + str(len(querylist)) + u" queries executed", logger.DEBUG)
return sqlResult
except sqlite3.OperationalError, e:
sqlResult = []
if self.connection:
self.connection.rollback()
if "unable to open database file" in e.args[0] or "database is locked" in e.args[0]:
logger.log(u"DB error: " + ex(e), logger.WARNING)
attempt += 1
time.sleep(cpu_presets[sickbeard.CPU_PRESET])
else:
logger.log(u"DB error: " + ex(e), logger.ERROR)
raise
except sqlite3.DatabaseError, e:
sqlResult = []
if self.connection:
self.connection.rollback()
logger.log(u"Fatal error executing query: " + ex(e), logger.ERROR)
raise
return sqlResult
def action(self, query, args=None):
with db_lock:
if query == None:
return
sqlResult = None
attempt = 0
while attempt < 5:
try:
if args == None:
logger.log(self.filename + ": " + query, logger.DB)
sqlResult = self.connection.execute(query)
else:
logger.log(self.filename + ": " + query + " with args " + str(args), logger.DB)
sqlResult = self.connection.execute(query, args)
self.connection.commit()
# get out of the connection attempt loop since we were successful
break
except sqlite3.OperationalError, e:
if "unable to open database file" in e.args[0] or "database is locked" in e.args[0]:
logger.log(u"DB error: " + ex(e), logger.WARNING)
attempt += 1
time.sleep(cpu_presets[sickbeard.CPU_PRESET])
else:
logger.log(u"DB error: " + ex(e), logger.ERROR)
raise
except sqlite3.DatabaseError, e:
logger.log(u"Fatal error executing query: " + ex(e), logger.ERROR)
raise
return sqlResult
def select(self, query, args=None):
sqlResults = self.action(query, args).fetchall()
if sqlResults == None:
return []
return sqlResults
def upsert(self, tableName, valueDict, keyDict):
changesBefore = self.connection.total_changes
genParams = lambda myDict: [x + " = ?" for x in myDict.keys()]
query = "UPDATE " + tableName + " SET " + ", ".join(genParams(valueDict)) + " WHERE " + " AND ".join(
genParams(keyDict))
self.action(query, valueDict.values() + keyDict.values())
if self.connection.total_changes == changesBefore:
query = "INSERT INTO " + tableName + " (" + ", ".join(valueDict.keys() + keyDict.keys()) + ")" + \
" VALUES (" + ", ".join(["?"] * len(valueDict.keys() + keyDict.keys())) + ")"
self.action(query, valueDict.values() + keyDict.values())
def tableInfo(self, tableName):
# FIXME ? binding is not supported here, but I cannot find a way to escape a string manually
cursor = self.connection.execute("PRAGMA table_info(%s)" % tableName)
columns = {}
for column in cursor:
columns[column['name']] = {'type': column['type']}
return columns
# http://stackoverflow.com/questions/3300464/how-can-i-get-dict-from-sqlite-query
def _dict_factory(self, cursor, row):
d = {}
for idx, col in enumerate(cursor.description):
d[col[0]] = row[idx]
return d
def sanityCheckDatabase(connection, sanity_check):
sanity_check(connection).check()
class DBSanityCheck(object):
def __init__(self, connection):
self.connection = connection
def check(self):
pass
# ===============
# = Upgrade API =
# ===============
def upgradeDatabase(connection, schema):
logger.log(u"Checking database structure...", logger.MESSAGE)
_processUpgrade(connection, schema)
def prettyName(class_name):
return ' '.join([x.group() for x in re.finditer("([A-Z])([a-z0-9]+)", class_name)])
def _processUpgrade(connection, upgradeClass):
instance = upgradeClass(connection)
logger.log(u"Checking " + prettyName(upgradeClass.__name__) + " database upgrade", logger.DEBUG)
if not instance.test():
logger.log(u"Database upgrade required: " + prettyName(upgradeClass.__name__), logger.MESSAGE)
try:
instance.execute()
except sqlite3.DatabaseError, e:
print "Error in " + str(upgradeClass.__name__) + ": " + ex(e)
raise
logger.log(upgradeClass.__name__ + " upgrade completed", logger.DEBUG)
else:
logger.log(upgradeClass.__name__ + " upgrade not required", logger.DEBUG)
for upgradeSubClass in upgradeClass.__subclasses__():
_processUpgrade(connection, upgradeSubClass)
# Base migration class. All future DB changes should be subclassed from this class
class SchemaUpgrade(object):
def __init__(self, connection):
self.connection = connection
def hasTable(self, tableName):
return len(self.connection.action("SELECT 1 FROM sqlite_master WHERE name = ?;", (tableName, )).fetchall()) > 0
def hasColumn(self, tableName, column):
return column in self.connection.tableInfo(tableName)
def addColumn(self, table, column, type="NUMERIC", default=0):
self.connection.action("ALTER TABLE %s ADD %s %s" % (table, column, type))
self.connection.action("UPDATE %s SET %s = ?" % (table, column), (default,))
def checkDBVersion(self):
result = self.connection.select("SELECT db_version FROM db_version")
if result:
return int(result[0]["db_version"])
else:
return 0
def incDBVersion(self):
new_version = self.checkDBVersion() + 1
self.connection.action("UPDATE db_version SET db_version = ?", [new_version])
return new_version