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# Author: Nic Wolfe <nic@wolfeden.ca>
# URL: http://code.google.com/p/sickbeard/
#
# This file is part of Sick Beard.
#
# Sick Beard 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.
#
# Sick Beard 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 Sick Beard. 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
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 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.DEBUG)
sqlResult = self.connection.execute(query)
else:
logger.log(self.filename+": "+query+" with args "+str(args), logger.DEBUG)
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.message or "database is locked" in e.message:
logger.log(u"DB error: "+ex(e), logger.WARNING)
attempt += 1
time.sleep(1)
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(str):
return ' '.join([x.group() for x in re.finditer("([A-Z])([a-z0-9]+)", str)])
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):
curVersion = self.checkDBVersion()
self.connection.action("UPDATE db_version SET db_version = ?", [curVersion+1])
return curVersion+1
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