Eos/eos/core/db/postgresql.py

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# Eos - Verifiable elections
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# Copyright © 2017-18 RunasSudo (Yingtong Li)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import psycopg2
from psycopg2.sql import SQL, Identifier
import psycopg2.extras
import eos.core.db
class PostgreSQLDBProvider(eos.core.db.DBProvider):
def connect(self):
self.conn = psycopg2.connect(self.db_uri, dbname=self.db_name)
self.cur = self.conn.cursor()
def create_table(self, table):
self.cur.execute(SQL('CREATE TABLE IF NOT EXISTS {} (_id uuid NOT NULL, data json, PRIMARY KEY (_id))').format(Identifier(table)))
self.conn.commit()
def get_all(self, table):
self.create_table(table)
self.cur.execute(SQL('SELECT data FROM {}').format(Identifier(table)))
return [x[0] for x in self.cur.fetchall()]
def get_all_by_fields(self, table, fields):
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def does_match(val):
if '_id' in fields and val['_id'] != fields.pop('_id'):
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return False
if 'type' in fields and val['type'] != fields.pop('type'):
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return False
for field in fields:
if val['value'][field] != fields[field]:
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return False
return True
# TODO: Make this much better
result = []
for val in self.get_all(table):
if does_match(val):
result.append(val)
return result
def get_by_id(self, table, _id):
self.create_table(table)
self.cur.execute(SQL('SELECT data FROM {} WHERE _id = %s').format(Identifier(table)), (_id,))
return self.cur.fetchone()[0]
def update_by_id(self, table, _id, value):
self.create_table(table)
self.cur.execute(SQL('INSERT INTO {} (_id, data) VALUES (%s, %s) ON CONFLICT (_id) DO UPDATE SET data = excluded.data').format(Identifier(table)), (_id, psycopg2.extras.Json(value)))
self.conn.commit()
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def delete_by_id(self, table, _id):
self.create_table(table)
self.cur.execute(SQL('DELETE FROM {} WHERE _id = %s').format(Identifier(table)), (_id))
self.conn.commit()
def reset_db(self):
self.cur.execute('DROP SCHEMA public CASCADE; CREATE SCHEMA public; GRANT ALL ON SCHEMA public TO postgres; GRANT ALL ON SCHEMA public TO public')
self.conn.commit()
eos.core.db.db_providers['postgresql'] = PostgreSQLDBProvider