connectors refactor

api/src/engines/postgres/index.js

@@ -0,0 +1,22 @@
+const { Client } = require('pg');
+
+module.exports = {
+  async connect({ server, port, user, password }) {
+    const client = new Client({ host: server, port, user, password, database: 'postgres' });
+    await client.connect();
+    return client;
+  },
+  async query(client, sql) {
+    const res = await client.query(sql);
+    return res.rows;
+  },
+  async getVersion(client) {
+    const rows = await this.query(client, 'SELECT version()');
+    const { version } = rows[0];
+    return { version };
+  },
+  async listDatabases(client) {
+    const res = await this.query(client, 'SELECT datname AS name FROM pg_database WHERE datistemplate = false');
+    return res;
+  },
+};