Added reload frontend wrapper to bridge

- Allows for slight decoupling of API and frontend with route settings being updated
- Activate theme now calls the same codepath to reload the frontend
- Yet another step on the path to make it possible to init/reload/run the frontend independently from the server

core/bridge.js

@@ -53,8 +53,7 @@ class Bridge {
 
             if (previousGhostAPI !== undefined && (previousGhostAPI !== currentGhostAPI)) {
                 events.emit('services.themes.api.changed');
-                const siteApp = require('./server/web/site/app');
-                siteApp.reload();
+                this.reloadFrontend();
             }
         } catch (err) {
             logging.error(new errors.InternalServerError({
@@ -71,6 +70,12 @@ class Bridge {
             return config.get('api:versions:default');
         }
     }
+
+    reloadFrontend() {
+        const apiVersion = this.getFrontendApiVersion();
+        const siteApp = require('./server/web/site/app');
+        siteApp.reload({apiVersion});
+    }
 }
 
 const bridge = new Bridge();

core/frontend/services/routing/settings.js

@@ -6,6 +6,7 @@ const urlService = require('../url');
 
 const errors = require('@tryghost/errors');
 const config = require('../../../shared/config');
+const bridge = require('../../../bridge');
 
 /**
  * The `routes.yaml` file offers a way to configure your Ghost blog. It's currently a setting feature
@@ -18,6 +19,7 @@ const config = require('../../../shared/config');
  *   - we don't destroy the resources, we only release them (this avoids reloading all resources from the db again)
  * - then we reload the whole site app, which will reset all routers and re-create the url generators
  */
+
 const setFromFilePath = (filePath) => {
     const settingsPath = config.getContentPath('settings');
     const backupRoutesPath = path.join(settingsPath, `routes-${moment().format('YYYY-MM-DD-HH-mm-ss')}.yaml`);
@@ -30,19 +32,17 @@ const setFromFilePath = (filePath) => {
             urlService.resetGenerators({releaseResourcesOnly: true});
         })
         .then(() => {
-            const siteApp = require('../../../server/web/site/app');
-
             const bringBackValidRoutes = () => {
                 urlService.resetGenerators({releaseResourcesOnly: true});
 
                 return fs.copy(backupRoutesPath, `${settingsPath}/routes.yaml`)
                     .then(() => {
-                        return siteApp.reload();
+                        return bridge.reloadFrontend();
                     });
             };
 
             try {
-                siteApp.reload();
+                bridge.reloadFrontend();
             } catch (err) {
                 return bringBackValidRoutes()
                     .finally(() => {

core/server/web/site/app.js

@@ -6,7 +6,6 @@ const {URL} = require('url');
 const errors = require('@tryghost/errors');
 
 // App requires
-const bridge = require('../../../bridge');
 const config = require('../../../shared/config');
 const constants = require('@tryghost/constants');
 const storage = require('../../adapters/storage');
@@ -190,9 +189,9 @@ module.exports = function setupSiteApp(options = {}) {
     return siteApp;
 };
 
-module.exports.reload = () => {
+module.exports.reload = ({apiVersion}) => {
     // https://github.com/expressjs/express/issues/2596
-    router = siteRoutes({start: bridge.getFrontendApiVersion()});
+    router = siteRoutes({start: apiVersion});
     Object.setPrototypeOf(SiteRouter, router);
 
     // re-initialse apps (register app routers, because we have re-initialised the site routers)