75 lines
2.7 KiB
Python
75 lines
2.7 KiB
Python
# Eos - Verifiable elections
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# Copyright © 2017-18 RunasSudo (Yingtong Li)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import psycopg2
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from psycopg2.sql import SQL, Identifier
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import psycopg2.extras
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import eos.core.db
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class PostgreSQLDBProvider(eos.core.db.DBProvider):
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def connect(self):
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self.conn = psycopg2.connect(self.db_uri, dbname=self.db_name)
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self.cur = self.conn.cursor()
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def create_table(self, table):
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self.cur.execute(SQL('CREATE TABLE IF NOT EXISTS {} (_id uuid NOT NULL, data json, PRIMARY KEY (_id))').format(Identifier(table)))
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self.conn.commit()
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def get_all(self, table):
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self.create_table(table)
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self.cur.execute(SQL('SELECT data FROM {}').format(Identifier(table)))
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return [x[0] for x in self.cur.fetchall()]
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def get_all_by_fields(self, table, fields):
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def does_match(val):
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if '_id' in fields and val['_id'] != fields.pop('_id'):
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return False
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if 'type' in fields and val['type'] != fields.pop('type'):
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return False
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for field in fields:
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if val['value'][field] != fields[field]:
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return False
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return True
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# TODO: Make this much better
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result = []
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for val in self.get_all(table):
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if does_match(val):
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result.append(val)
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return result
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def get_by_id(self, table, _id):
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self.create_table(table)
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self.cur.execute(SQL('SELECT data FROM {} WHERE _id = %s').format(Identifier(table)), (_id,))
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return self.cur.fetchone()[0]
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def update_by_id(self, table, _id, value):
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self.create_table(table)
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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)))
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self.conn.commit()
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def delete_by_id(self, table, _id):
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self.create_table(table)
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self.cur.execute(SQL('DELETE FROM {} WHERE _id = %s').format(Identifier(table)), (_id))
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self.conn.commit()
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def reset_db(self):
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self.cur.execute('DROP SCHEMA public CASCADE; CREATE SCHEMA public; GRANT ALL ON SCHEMA public TO postgres; GRANT ALL ON SCHEMA public TO public')
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self.conn.commit()
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eos.core.db.db_providers['postgresql'] = PostgreSQLDBProvider
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