Move Http Error logic to HttpGetStore

Reviewed By: rafeca

Differential Revision: D8661425

fbshipit-source-id: 6d59a6a4e50d2621703c86a82a139526f4b1f76a

packages/metro-cache/src/stores/HttpError.js

@@ -0,0 +1,23 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @flow
+ */
+
+'use strict';
+
+class HttpError extends Error {
+  statusCode: number;
+
+  constructor(message: string, statusCode: number) {
+    super(message);
+
+    this.statusCode = statusCode;
+  }
+}
+
+module.exports = HttpError;

packages/metro-cache/src/stores/HttpStore.js

@@ -10,6 +10,8 @@
 
 'use strict';
 
+const HttpError = require('./HttpError');
+
 const http = require('http');
 const https = require('https');
 const url = require('url');
@@ -26,6 +28,8 @@ const ZLIB_OPTIONS = {
 };
 
 class HttpStore<T> {
+  static HttpError = HttpError;
+
   _module: typeof http | typeof https;
   _timeout: number;
 
@@ -81,11 +85,9 @@ class HttpStore<T> {
           // Consume all the data from the response without processing it.
           res.resume();
 
-          if (res.statusCode === 404) {
-            resolve(null);
-          } else {
-            reject(new Error('HTTP error: ' + res.statusCode));
-          }
+          reject(
+            new HttpError('HTTP error: ' + res.statusCode, res.statusCode),
+          );
 
           return;
         }

packages/metro-cache/src/stores/__tests__/HttpStore-test.js

@@ -95,20 +95,7 @@ describe('HttpStore', () => {
     expect(await promise).toEqual({foo: 42});
   });
 
-  it('resolves with "null" when HTTP 404 is returned', async () => {
-    const store = new HttpStore({endpoint: 'http://example.com'});
-    const promise = store.get(Buffer.from('key'));
-    const [opts, callback] = require('http').request.mock.calls[0];
-
-    expect(opts.method).toEqual('GET');
-
-    callback(responseHttpError(404));
-    jest.runAllTimers();
-
-    expect(await promise).toEqual(null);
-  });
-
-  it('rejects when an HTTP different of 200/404 is returned', done => {
+  it('rejects when an HTTP different from 200 is returned', done => {
     const store = new HttpStore({endpoint: 'http://example.com'});
     const promise = store.get(Buffer.from('key'));
     const [opts, callback] = require('http').request.mock.calls[0];
@@ -119,8 +106,9 @@ describe('HttpStore', () => {
     jest.runAllTimers();
 
     promise.catch(err => {
-      expect(err).toBeInstanceOf(Error);
+      expect(err).toBeInstanceOf(HttpStore.HttpError);
       expect(err.message).toMatch(/HTTP error: 503/);
+      expect(err.statusCode).toBe(503);
       done();
     });
   });