feat: Error type for returning specific http status codes (#288). Thanks to @willhausman!

* type for returning specific http status codes

* cube base error

Author: willhausman

packages/cubejs-api-gateway/CubejsHandlerError.js

@@ -0,0 +1,9 @@
+class CubejsHandlerError extends Error {
+  constructor(status, type, message) {
+    super(message || type);
+    this.status = status;
+    this.type = type;
+  }
+}
+
+module.exports = CubejsHandlerError;

packages/cubejs-api-gateway/UserError.js

@@ -1,3 +1,9 @@
-class UserError extends Error {}
+const CubejsHandlerError = require('./CubejsHandlerError');
+
+class UserError extends CubejsHandlerError {
+  constructor(message) {
+    super(400, 'User Error', message);
+  }
+}
 
 module.exports = UserError;

packages/cubejs-api-gateway/index.js

@@ -5,6 +5,7 @@ const moment = require('moment');
 const dateParser = require('./dateParser');
 
 const UserError = require('./UserError');
+const CubejsHandlerError = require('./CubejsHandlerError');
 const SubscriptionServer = require('./SubscriptionServer');
 const LocalSubscriptionStore = require('./LocalSubscriptionStore');
 
@@ -429,14 +430,14 @@ class ApiGateway {
   handleError({
     e, context, query, res, requestStarted
   }) {
-    if (e instanceof UserError) {
+    if (e instanceof CubejsHandlerError) {
       this.log(context, {
-        type: 'User Error',
+        type: e.type,
         query,
         error: e.message,
         duration: this.duration(requestStarted)
       });
-      res({ error: e.message }, { status: 400 });
+      res({ error: e.message }, { status: e.status });
     } else if (e.error === 'Continue wait') {
       this.log(context, {
         type: 'Continue wait',