Experimental fix for AWS Lambda issue (!3636)

Author: briandamaged

lib/dialects/postgres/index.js

@@ -25,6 +25,22 @@ function Client_PG(config) {
 inherits(Client_PG, Client);
 
 Object.assign(Client_PG.prototype, {
+  validateConnection(connection) {
+    // TODO: This is just an experimental fix.
+
+    const c = connection.connection;
+    // pg has not even attempted to establish a connection yet.
+    // Which means: pg will establish a connection upon first use.
+    if (!c) {
+      return true;
+    }
+
+    // pg has established a connection already.  Let's confirm that
+    // it's still connected.
+    const s = c.stream;
+    return !s.connecting || (s.readable && s.writable);
+  },
+
   queryCompiler() {
     return new QueryCompiler(this, ...arguments);
   },
@@ -124,6 +140,7 @@ Object.assign(Client_PG.prototype, {
             resolver(connection);
           });
         }
+        console.log(connection);
         resolver(connection);
       });
     }).then(function setSearchPath(connection) {