Implement PostgreSQL "support". Closes #3

Good god what have I done

eos/core/db/postgresql.py

@@ -0,0 +1,51 @@
+#   Eos - Verifiable elections
+#   Copyright © 2017  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_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()
+	
+	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

eos/core/objects/__init__.py

@@ -29,6 +29,7 @@ if is_python:
 	__pragma__('skip')
 	import eos.core.db
 	import eos.core.db.mongodb
+	import eos.core.db.postgresql
 	
 	from bson.binary import UUIDLegacy
 	

local_settings.example.py

@@ -13,6 +13,12 @@ DB_TYPE = 'mongodb'
 DB_URI = 'mongodb://localhost:27017/'
 DB_NAME = 'eos'
 
+# PostgreSQL
+
+#DB_TYPE = 'postgresql'
+#DB_URI = 'postgresql://'
+#DB_NAME = 'eos'
+
 # Email
 
 SMTP_HOST, SMTP_PORT = 'localhost', 25

requirements.txt

@@ -1,13 +1,22 @@
+certifi==2017.11.5
+chardet==3.0.4
 click==6.7
 coverage==4.4.1
 Flask==0.12.2
+Flask-OAuthlib==0.9.4
+idna==2.6
 itsdangerous==0.24
 Jinja2==2.10
 MarkupSafe==1.0
 mypy==0.521
+oauthlib==2.0.6
+psycopg2==2.7.3.2
 PyExecJS==1.4.1
 pymongo==3.5.1
+requests==2.18.4
+requests-oauthlib==0.8.0
 six==1.10.0
 Transcrypt==3.6.50
 typed-ast==1.0.4
+urllib3==1.22
 Werkzeug==0.12.2