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# Cork - Authentication module for the Bottle web framework
# Copyright (C) 2013 Federico Ceratto and others, see AUTHORS file.
# Released under LGPLv3+ license, see LICENSE.txt
"""
.. module:: sqlite_backend
:synopsis: SQLite storage backend.
"""
from . import base_backend
from logging import getLogger
log = getLogger(__name__)
class SqlRowProxy(dict):
def __init__(self, table, key, row):
li = ((k, v) for (k, ktype), v in zip(table._columns[1:], row[1:]))
dict.__init__(self, li)
self._table = table
self._key = key
def __setitem__(self, key, value):
dict.__setitem__(self, key, value)
self._table[self._key] = self
class Table(base_backend.Table):
"""Provides dictionary-like access to an SQL table."""
def __init__(self, backend, table_name):
self._backend = backend
self._engine = backend.connection
self._table_name = table_name
self._column_names = [n for n, t in self._columns]
self._key_col_num = 0
self._key_col_name = self._column_names[self._key_col_num]
self._key_col = self._column_names[self._key_col_num]
def _row_to_value(self, key, row):
assert isinstance(row, tuple)
row_key = row[self._key_col_num]
row_value = SqlRowProxy(self, key, row)
return row_key, row_value
def __len__(self):
query = "SELECT count() FROM %s" % self._table_name
ret = self._backend.run_query(query)
return ret.fetchone()[0]
def __contains__(self, key):
#FIXME: count()
query = "SELECT * FROM %s WHERE %s='%s'" % \
(self._table_name, self._key_col, key)
row = self._backend.fetch_one(query)
return row is not None
def __setitem__(self, key, value):
"""Create or update a row"""
assert isinstance(value, dict)
v, cn = set(value), set(self._column_names[1:])
assert not v - cn, repr(v - cn)
assert not cn - v, repr(cn - v)
assert set(value) == set(self._column_names[1:]), "%s %s" % \
(repr(set(value)), repr(set(self._column_names[1:])))
col_values = [key] + [value[k] for k in self._column_names[1:]]
col_names = ', '.join(self._column_names)
question_marks = ', '.join('?' for x in col_values)
query = "INSERT OR REPLACE INTO %s (%s) VALUES (%s)" % \
(self._table_name, col_names, question_marks)
ret = self._backend.run_query_using_conversion(query, col_values)
def __getitem__(self, key):
query = "SELECT * FROM %s WHERE %s='%s'" % \
(self._table_name, self._key_col, key)
row = self._backend.fetch_one(query)
if row is None:
raise KeyError(key)
return self._row_to_value(key, row)[1]
#return dict(zip(self._column_names, row))
def __iter__(self):
"""Iterate over table index key values"""
query = "SELECT %s FROM %s" % (self._key_col, self._table_name)
result = self._backend.run_query(query)
for row in result:
yield row[0]
def iteritems(self):
"""Iterate over table rows"""
query = "SELECT * FROM %s" % self._table_name
result = self._backend.run_query(query)
for row in result:
d = dict(zip(self._column_names, row))
d.pop(self._key_col)
yield (self._key_col, d)
def pop(self, key):
d = self.__getitem__(key)
query = "DELETE FROM %s WHERE %s='%s'" % \
(self._table_name, self._key_col, key)
self._backend.fetch_one(query)
#FIXME: check deletion
return d
def insert(self, d):
raise NotImplementedError
def empty_table(self):
raise NotImplementedError
def create_table(self):
"""Issue table creation"""
cc = []
for col_name, col_type in self._columns:
if col_type == int:
col_type = 'INTEGER'
elif col_type == str:
col_type = 'TEXT'
if col_name == self._key_col:
extras = 'PRIMARY KEY ASC'
else:
extras = ''
cc.append("%s %s %s" % (col_name, col_type, extras))
cc = ','.join(cc)
query = "CREATE TABLE %s (%s)" % (self._table_name, cc)
self._backend.run_query(query)
class SingleValueTable(Table):
def __init__(self, *args):
super(SingleValueTable, self).__init__(*args)
self._value_col = self._column_names[1]
def __setitem__(self, key, value):
"""Create or update a row"""
assert not isinstance(value, dict)
query = "INSERT OR REPLACE INTO %s (%s, %s) VALUES (?, ?)" % \
(self._table_name, self._key_col, self._value_col)
col_values = (key, value)
ret = self._backend.run_query_using_conversion(query, col_values)
def __getitem__(self, key):
query = "SELECT %s FROM %s WHERE %s='%s'" % \
(self._value_col, self._table_name, self._key_col, key)
row = self._backend.fetch_one(query)
if row is None:
raise KeyError(key)
return row[0]
class UsersTable(Table):
def __init__(self, *args, **kwargs):
self._columns = (
('username', str),
('role', str),
('hash', str),
('email_addr', str),
('desc', str),
('creation_date', str),
('last_login', str)
)
super(UsersTable, self).__init__(*args, **kwargs)
class RolesTable(SingleValueTable):
def __init__(self, *args, **kwargs):
self._columns = (
('role', str),
('level', int)
)
super(RolesTable, self).__init__(*args, **kwargs)
class PendingRegistrationsTable(Table):
def __init__(self, *args, **kwargs):
self._columns = (
('code', str),
('username', str),
('role', str),
('hash', str),
('email_addr', str),
('desc', str),
('creation_date', str)
)
super(PendingRegistrationsTable, self).__init__(*args, **kwargs)
class SQLiteBackend(base_backend.Backend):
def __init__(self, filename, users_tname='users', roles_tname='roles',
pending_reg_tname='register', initialize=False):
self._filename = filename
self.users = UsersTable(self, users_tname)
self.roles = RolesTable(self, roles_tname)
self.pending_registrations = PendingRegistrationsTable(self, pending_reg_tname)
if initialize:
self.users.create_table()
self.roles.create_table()
self.pending_registrations.create_table()
log.debug("Tables created")
@property
def connection(self):
try:
return self._connection
except AttributeError:
import sqlite3
self._connection = sqlite3.connect(self._filename, isolation_level=None)
return self._connection
def run_query(self, query):
return self._connection.execute(query)
def run_query_using_conversion(self, query, args):
return self._connection.execute(query, args)
def fetch_one(self, query):
return self._connection.execute(query).fetchone()
def _initialize_storage(self, db_name):
raise NotImplementedError
def _drop_all_tables(self):
raise NotImplementedError
def save_users(self): pass
def save_roles(self): pass
def save_pending_registrations(self): pass
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