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"""BitBake Persistent Data Store
Used to store data in a central location such that other threads/tasks can
access them at some future date. Acts as a convenience wrapper around sqlite,
currently, providing a key/value store accessed by 'domain'.
"""
# Copyright (C) 2007 Richard Purdie
# Copyright (C) 2010 Chris Larson <chris_larson@mentor.com>
#
# 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 collections
import logging
import os.path
import sys
import warnings
from bb.compat import total_ordering
from collections import Mapping
try:
import sqlite3
except ImportError:
from pysqlite2 import dbapi2 as sqlite3
sqlversion = sqlite3.sqlite_version_info
if sqlversion[0] < 3 or (sqlversion[0] == 3 and sqlversion[1] < 3):
raise Exception("sqlite3 version 3.3.0 or later is required.")
logger = logging.getLogger("BitBake.PersistData")
if hasattr(sqlite3, 'enable_shared_cache'):
try:
sqlite3.enable_shared_cache(True)
except sqlite3.OperationalError:
pass
@total_ordering
class SQLTable(collections.MutableMapping):
"""Object representing a table/domain in the database"""
def __init__(self, cachefile, table):
self.cachefile = cachefile
self.table = table
self.cursor = connect(self.cachefile)
self._execute("CREATE TABLE IF NOT EXISTS %s(key TEXT, value TEXT);"
% table)
def _execute(self, *query):
"""Execute a query, waiting to acquire a lock if necessary"""
count = 0
while True:
try:
return self.cursor.execute(*query)
except sqlite3.OperationalError as exc:
if 'database is locked' in str(exc) and count < 500:
count = count + 1
self.cursor.close()
self.cursor = connect(self.cachefile)
continue
raise
def __enter__(self):
self.cursor.__enter__()
return self
def __exit__(self, *excinfo):
self.cursor.__exit__(*excinfo)
def __getitem__(self, key):
data = self._execute("SELECT * from %s where key=?;" %
self.table, [key])
for row in data:
return row[1]
raise KeyError(key)
def __delitem__(self, key):
if key not in self:
raise KeyError(key)
self._execute("DELETE from %s where key=?;" % self.table, [key])
def __setitem__(self, key, value):
if not isinstance(key, basestring):
raise TypeError('Only string keys are supported')
elif not isinstance(value, basestring):
raise TypeError('Only string values are supported')
data = self._execute("SELECT * from %s where key=?;" %
self.table, [key])
exists = len(list(data))
if exists:
self._execute("UPDATE %s SET value=? WHERE key=?;" % self.table,
[value, key])
else:
self._execute("INSERT into %s(key, value) values (?, ?);" %
self.table, [key, value])
def __contains__(self, key):
return key in set(self)
def __len__(self):
data = self._execute("SELECT COUNT(key) FROM %s;" % self.table)
for row in data:
return row[0]
def __iter__(self):
data = self._execute("SELECT key FROM %s;" % self.table)
return (row[0] for row in data)
def __lt__(self, other):
if not isinstance(other, Mapping):
raise NotImplemented
return len(self) < len(other)
def values(self):
return list(self.itervalues())
def itervalues(self):
data = self._execute("SELECT value FROM %s;" % self.table)
return (row[0] for row in data)
def items(self):
return list(self.iteritems())
def iteritems(self):
return self._execute("SELECT * FROM %s;" % self.table)
def clear(self):
self._execute("DELETE FROM %s;" % self.table)
def has_key(self, key):
return key in self
class PersistData(object):
"""Deprecated representation of the bitbake persistent data store"""
def __init__(self, d):
warnings.warn("Use of PersistData is deprecated. Please use "
"persist(domain, d) instead.",
category=DeprecationWarning,
stacklevel=2)
self.data = persist(d)
logger.debug(1, "Using '%s' as the persistent data cache",
self.data.filename)
def addDomain(self, domain):
"""
Add a domain (pending deprecation)
"""
return self.data[domain]
def delDomain(self, domain):
"""
Removes a domain and all the data it contains
"""
del self.data[domain]
def getKeyValues(self, domain):
"""
Return a list of key + value pairs for a domain
"""
return self.data[domain].items()
def getValue(self, domain, key):
"""
Return the value of a key for a domain
"""
return self.data[domain][key]
def setValue(self, domain, key, value):
"""
Sets the value of a key for a domain
"""
self.data[domain][key] = value
def delValue(self, domain, key):
"""
Deletes a key/value pair
"""
del self.data[domain][key]
def connect(database):
return sqlite3.connect(database, timeout=5, isolation_level=None)
def persist(domain, d):
"""Convenience factory for SQLTable objects based upon metadata"""
import bb.utils
cachedir = (d.getVar("PERSISTENT_DIR", True) or
d.getVar("CACHE", True))
if not cachedir:
logger.critical("Please set the 'PERSISTENT_DIR' or 'CACHE' variable")
sys.exit(1)
bb.utils.mkdirhier(cachedir)
cachefile = os.path.join(cachedir, "bb_persist_data.sqlite3")
return SQLTable(cachefile, domain)
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