Switch to using pg.Pool

lib/document_stores/postgres.js

@@ -1,14 +1,16 @@
 /*global require,module,process*/
 
 var winston = require('winston');
-const {Client} = require('pg');
+const {Pool} = require('pg');
 
 // create table entries (id serial primary key, key varchar(255) not null, value text not null, expiration int, unique(key));
 
 // A postgres document store
 var PostgresDocumentStore = function (options) {
   this.expireJS = options.expire;
-  this.connectionUrl = process.env.DATABASE_URL || options.connectionUrl;
+
+  const connectionString = process.env.DATABASE_URL || options.connectionUrl;
+  this.pool = new Pool({connectionString});
 };
 
 PostgresDocumentStore.prototype = {
@@ -64,20 +66,15 @@ PostgresDocumentStore.prototype = {
 
   // A connection wrapper
   safeConnect: function (callback) {
-    const client = new Client({connectionString: this.connectionUrl});
-    const connectionPromise = client.connect();
-
-    const done = () => {};
-
-    connectionPromise.then(() => {
-      callback(undefined, client, done);
-    }).catch((error) => {
-      console.log(error);
+    this.pool.connect((err, client, done) => {
+      if (err) {
         winston.error('error connecting to postgres', {error});
         callback(error);
+      } else {
+        callback(undefined, client, done);
+      }
     });
   }
-
 };
 
 module.exports = PostgresDocumentStore;