sugar-toolkit-gtk3/services/datastore/datastore.py
2006-12-11 17:25:48 -05:00

347 lines
12 KiB
Python

#!/bin/python
# Copyright (C) 2006, Red Hat, Inc.
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# 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 St, Fifth Floor, Boston, MA 02110-1301 USA
import os
import dbus, dbus.glib, gobject
import logging
import sqlite
import dbus_helpers
have_sugar = False
try:
from sugar import env
have_sugar = True
except ImportError:
pass
_DS_SERVICE = "org.laptop.sugar.DataStore"
_DS_DBUS_INTERFACE = "org.laptop.sugar.DataStore"
_DS_OBJECT_PATH = "/org/laptop/sugar/DataStore"
_DS_OBJECT_DBUS_INTERFACE = "org.laptop.sugar.DataStore.Object"
_DS_OBJECT_OBJECT_PATH = "/org/laptop/sugar/DataStore/Object"
class NotFoundError(Exception):
pass
def _create_op(uid):
return "%s/%d" % (_DS_OBJECT_OBJECT_PATH, uid)
def _get_uid_from_op(op):
if not op.startswith(_DS_OBJECT_OBJECT_PATH + "/"):
raise ValueError("Invalid object path %s." % op)
item = op[len(_DS_OBJECT_OBJECT_PATH + "/"):]
return int(item)
def _get_data_as_string(data):
if isinstance(data, list):
data_str = ""
for item in data:
data_str += chr(item)
return data_str
elif isinstance(data, int):
return str(data)
elif isinstance(data, str):
return data
elif isinstance(data, unicode):
return str(data)
else:
raise ValueError("Unsupported data type")
class DataStoreDBusHelper(dbus.service.Object):
def __init__(self, parent, bus_name):
self._parent = parent
self._bus_name = bus_name
dbus.service.Object.__init__(self, bus_name, _DS_OBJECT_PATH)
@dbus.service.method(_DS_DBUS_INTERFACE,
in_signature="x", out_signature="o")
def get(self, uid):
return _create_op(self._parent.get(uid))
@dbus.service.method(_DS_DBUS_INTERFACE,
in_signature="aya{sv}", out_signature="o")
def create(self, data, prop_dict):
uid = self._parent.create(data, prop_dict)
return _create_op(uid)
@dbus.service.method(_DS_DBUS_INTERFACE,
in_signature="o", out_signature="i")
def delete(self, op):
uid = _get_uid_from_op(op)
self._parent.delete(uid)
return 0
@dbus.service.method(_DS_DBUS_INTERFACE,
in_signature="a{sv}", out_signature="ao")
def find(self, prop_dict):
uids = self._parent.find(prop_dict)
ops = []
for uid in uids:
ops.append(_create_op(uid))
return ops
class ObjectDBusHelper(dbus_helpers.FallbackObject):
def __init__(self, parent, bus_name):
self._parent = parent
self._bus_name = bus_name
dbus_helpers.FallbackObject.__init__(self, bus_name, _DS_OBJECT_OBJECT_PATH)
@dbus_helpers.method(_DS_OBJECT_DBUS_INTERFACE,
in_signature="", out_signature="ay", dbus_message_keyword="dbus_message")
def get_data(self, dbus_message=None):
if not dbus_message:
raise RuntimeError("Need the dbus message.")
uid = _get_uid_from_op(dbus_message.get_path())
return self._parent.get_data(uid)
@dbus_helpers.method(_DS_OBJECT_DBUS_INTERFACE,
in_signature="ay", out_signature="i", dbus_message_keyword="dbus_message")
def set_data(self, data, dbus_message=None):
if not dbus_message:
raise RuntimeError("Need the dbus message.")
uid = _get_uid_from_op(dbus_message.get_path())
self._parent.set_data(uid, data)
return 0
@dbus_helpers.method(_DS_OBJECT_DBUS_INTERFACE,
in_signature="as", out_signature="a{sv}", dbus_message_keyword="dbus_message")
def get_properties(self, keys, dbus_message=None):
if not dbus_message:
raise RuntimeError("Need the dbus message.")
uid = _get_uid_from_op(dbus_message.get_path())
return self._parent.get_properties(uid, keys)
@dbus_helpers.method(_DS_OBJECT_DBUS_INTERFACE,
in_signature="a{sv}", out_signature="i", dbus_message_keyword="dbus_message")
def set_properties(self, prop_dict, dbus_message=None):
if not dbus_message:
raise RuntimeError("Need the dbus message.")
uid = _get_uid_from_op(dbus_message.get_path())
self._parent.set_properties(uid, prop_dict)
return 0
@dbus_helpers.fallback_signal(_DS_OBJECT_DBUS_INTERFACE,
signature="ba{sv}b", ignore_args=["uid"])
def Updated(self, data, prop_dict, deleted, uid=None):
# Return the object path so the signal decorator knows what
# object this signal should be fore
if not uid:
raise RuntimeError("Need a UID.")
op = _create_op(uid)
return op
class DataStore(object):
def __init__(self):
self._session_bus = dbus.SessionBus()
self._bus_name = dbus.service.BusName(_DS_SERVICE, bus=self._session_bus)
self._dbus_helper = DataStoreDBusHelper(self, self._bus_name)
self._dbus_obj_helper = ObjectDBusHelper(self, self._bus_name)
ppath = "/tmp"
if have_sugar:
ppath = env.get_profile_path()
self._dbfile = os.path.join(ppath, "ds", "data-store.db")
if not os.path.exists(os.path.dirname(self._dbfile)):
os.makedirs(os.path.dirname(self._dbfile), 0755)
self._dbcx = sqlite.connect(self._dbfile, encoding="utf-8", timeout=3)
try:
self._ensure_table()
except StandardError, e:
logging.info("Could not access the data store. Reason: '%s'. Exiting..." % e)
os._exit(1)
def __del__(self):
self._dbcx.close()
del self._dbcx
def _ensure_table(self):
curs = self._dbcx.cursor()
try:
curs.execute('SELECT * FROM properties LIMIT 4')
self._dbcx.commit()
except Exception, e:
# If table wasn't created, try to create it
self._dbcx.commit()
curs.execute('CREATE TABLE objects (' \
'uid INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, ' \
'data BLOB' \
');')
curs.execute('CREATE TABLE properties (' \
'objid INTEGER NOT NULL, ' \
'key VARCHAR(100),' \
'value VARCHAR(200)' \
');')
curs.execute('CREATE INDEX objid_idx ON properties(objid);')
self._dbcx.commit()
del curs
def get(self, uid):
curs = self._dbcx.cursor()
curs.execute('SELECT uid FROM objects WHERE uid=%d;' % uid)
res = curs.fetchall()
self._dbcx.commit()
del curs
if len(res) > 0:
return uid
raise NotFoundError("Object %d was not found." % uid)
def create(self, data, prop_dict=None):
curs = self._dbcx.cursor()
data = sqlite.encode(_get_data_as_string(data))
curs.execute("INSERT INTO objects (uid, data) VALUES (NULL, '%s');" % data)
curs.execute("SELECT last_insert_rowid();")
rows = curs.fetchall()
self._dbcx.commit()
last_row = rows[0]
uid = last_row[0]
for (key, value) in prop_dict.items():
safe_key = key.replace("'", "''")
value = sqlite.encode(_get_data_as_string(value))
curs.execute("INSERT INTO properties (objid, key, value) VALUES (%d, '%s', '%s');" % (uid, safe_key, value))
self._dbcx.commit()
del curs
return uid
def delete(self, uid):
curs = self._dbcx.cursor()
curs.execute("DELETE FROM objects WHERE (uid=%d);" % uid)
curs.execute("DELETE FROM properties WHERE (objid=%d);" % uid)
self._dbcx.commit()
del curs
self._dbus_obj_helper.Updated(False, {}, True, uid=uid)
return 0
def find(self, prop_dict):
query = "SELECT objid FROM properties"
subquery = ""
for (key, value) in prop_dict.items():
safe_key = key.replace("'", "''")
value = _get_data_as_string(value)
if not len(value):
raise ValueError("Property values must not be blank.")
substr = "(key='%s' AND value='%s')" % (safe_key, sqlite.encode(value))
if len(subquery) > 0:
subquery += " OR "
subquery += substr
if len(subquery):
query += " WHERE (%s)" % subquery
query += ";"
curs = self._dbcx.cursor()
curs.execute(query)
rows = curs.fetchall()
self._dbcx.commit()
# FIXME: ensure that each properties.objid has a match in objects.uid
uids = []
for row in rows:
uids.append(row['objid'])
del curs
return uids
def set_data(self, uid, data):
curs = self._dbcx.cursor()
curs.execute('SELECT uid FROM objects WHERE uid=%d;' % uid)
res = curs.fetchall()
self._dbcx.commit()
if len(res) <= 0:
del curs
raise NotFoundError("Object %d was not found." % uid)
data = sqlite.encode(_get_data_as_string(data))
curs.execute("UPDATE objects SET data='%s' WHERE uid=%d;" % (data, uid))
self._dbcx.commit()
del curs
self._dbus_obj_helper.Updated(True, {}, False, uid=uid)
_reserved_keys = ["uid", "objid", "data", "created", "modified"]
def set_properties(self, uid, prop_dict):
curs = self._dbcx.cursor()
curs.execute('SELECT uid FROM objects WHERE uid=%d;' % uid)
res = curs.fetchall()
self._dbcx.commit()
if len(res) <= 0:
del curs
raise NotFoundError("Object %d was not found." % uid)
for key in prop_dict.keys():
if key in self._reserved_keys:
raise ValueError("key %s is a reserved key." % key)
for (key, value) in prop_dict.items():
safe_key = key.replace("'", "''")
value = _get_data_as_string(value)
if not len(value):
# delete the property
curs.execute("DELETE FROM properties WHERE (objid=%d AND key='%s');" % (uid, safe_key))
else:
enc_value = sqlite.encode(value)
curs.execute("SELECT objid FROM properties WHERE (objid=%d AND key='%s');" % (uid, safe_key))
if len(curs.fetchall()) > 0:
curs.execute("UPDATE properties SET value='%s' WHERE (objid=%d AND key='%s');" % (enc_value, uid, safe_key))
else:
curs.execute("INSERT INTO properties (objid, key, value) VALUES (%d, '%s', '%s');" % (uid, safe_key, enc_value))
self._dbcx.commit()
del curs
self._dbus_obj_helper.Updated(False, {}, False, uid=uid)
def get_data(self, uid):
curs = self._dbcx.cursor()
curs.execute('SELECT uid, data FROM objects WHERE uid=%d;' % uid)
res = curs.fetchall()
self._dbcx.commit()
if len(res) <= 0:
raise NotFoundError("Object %d was not found." % uid)
data = res[0][1]
del curs
return data
def get_properties(self, uid, keys):
query = "SELECT objid, key, value FROM properties WHERE (objid=%d" % uid
subquery = ""
if len(keys) > 0:
for key in keys:
if len(subquery) > 0:
subquery += " OR "
safe_key = key.replace("'", "''")
subquery += "key='%s'" % safe_key
subquery += ")"
query += subquery + ");"
curs = self._dbcx.cursor()
curs.execute(query)
rows = curs.fetchall()
self._dbcx.commit()
prop_dict = {}
for row in rows:
conv_key = row['key'].replace("''", "'")
prop_dict[conv_key] = sqlite.decode(row['value'])
prop_dict['uid'] = str(uid)
del curs
return prop_dict
def main():
loop = gobject.MainLoop()
ds = DataStore()
try:
loop.run()
except KeyboardInterrupt:
print 'Ctrl+C pressed, exiting...'
if __name__ == "__main__":
main()