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# BitBake Persistent Data Store
#
# Copyright (C) 2007 Richard Purdie
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import bb, os
import bb.utils
try:
import sqlite3
except ImportError:
try:
from pysqlite2 import dbapi2 as sqlite3
except ImportError:
bb.msg.fatal(bb.msg.domain.PersistData, "Importing sqlite3 and pysqlite2 failed, please install one of them. Python 2.5 or a 'python-pysqlite2' like package is likely to be what you need.")
sqlversion = sqlite3.sqlite_version_info
if sqlversion[0] < 3 or (sqlversion[0] == 3 and sqlversion[1] < 3):
bb.msg.fatal(bb.msg.domain.PersistData, "sqlite3 version 3.3.0 or later is required.")
class PersistData:
"""
BitBake Persistent Data Store
Used to store data in a central location such that other threads/tasks can
access them at some future date.
The "domain" is used as a key to isolate each data pool and in this
implementation corresponds to an SQL table. The SQL table consists of a
simple key and value pair.
Why sqlite? It handles all the locking issues for us.
"""
def __init__(self, d, persistent_database_connection):
if "connection" in persistent_database_connection:
self.cursor = persistent_database_connection["connection"].cursor()
return
self.cachedir = bb.data.getVar("PERSISTENT_DIR", d, True) or bb.data.getVar("CACHE", d, True)
if self.cachedir in [None, '']:
bb.msg.fatal(bb.msg.domain.PersistData, "Please set the 'PERSISTENT_DIR' or 'CACHE' variable.")
try:
os.stat(self.cachedir)
except OSError:
bb.utils.mkdirhier(self.cachedir)
self.cachefile = os.path.join(self.cachedir, "bb_persist_data.sqlite3")
bb.msg.debug(1, bb.msg.domain.PersistData, "Using '%s' as the persistent data cache" % self.cachefile)
connection = sqlite3.connect(self.cachefile, timeout=5, isolation_level=None)
persistent_database_connection["connection"] = connection
self.cursor = persistent_database_connection["connection"].cursor()
def addDomain(self, domain):
"""
Should be called before any domain is used
Creates it if it doesn't exist.
"""
self._execute("CREATE TABLE IF NOT EXISTS %s(key TEXT, value TEXT);" % domain)
def delDomain(self, domain):
"""
Removes a domain and all the data it contains
"""
self._execute("DROP TABLE IF EXISTS %s;" % domain)
def getKeyValues(self, domain):
"""
Return a list of key + value pairs for a domain
"""
ret = {}
data = self._execute("SELECT key, value from %s;" % domain)
for row in data:
ret[str(row[0])] = str(row[1])
return ret
def getValue(self, domain, key):
"""
Return the value of a key for a domain
"""
data = self._execute("SELECT * from %s where key=?;" % domain, [key])
for row in data:
return row[1]
def setValue(self, domain, key, value):
"""
Sets the value of a key for a domain
"""
data = self._execute("SELECT * from %s where key=?;" % domain, [key])
rows = 0
for row in data:
rows = rows + 1
if rows:
self._execute("UPDATE %s SET value=? WHERE key=?;" % domain, [value, key])
else:
self._execute("INSERT into %s(key, value) values (?, ?);" % domain, [key, value])
def delValue(self, domain, key):
"""
Deletes a key/value pair
"""
self._execute("DELETE from %s where key=?;" % domain, [key])
#
# We wrap the sqlite execute calls as on contended machines or single threaded
# systems we can have multiple processes trying to access the DB at once and it seems
# sqlite sometimes doesn't wait for the timeout. We therefore loop but put in an
# emergency brake too
#
def _execute(self, *query):
count = 0
while True:
try:
ret = self.cursor.execute(*query)
#print "Had to retry %s times" % count
return ret
except sqlite3.OperationalError as e:
if 'database is locked' in str(e) and count < 500:
count = count + 1
continue
raise
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