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Ghost/core/boot.js
Hannah Wolfe d3f20c52fd Moved getApiVersion to a new shared "bridge" class
refs: bf0823c9a2

- Added a new bridge class that lives in shared. This should eventually be responsible for all cross-communication between the frontend and the server
- Having all the gnarly shared bits in one place should help us refactor more easily
- For now it also reduces requires between the core/server and core/frontend folders that are meant to be separate
- All calls to getApiVersion have also been renamed to getFrontendApiVersion, as this is different to the "default" API version
- Slowly getting to the point where frontend/services/themes can be moved to server/services/themes :)
2021-04-24 09:55:48 +01:00

332 lines
12 KiB
JavaScript

// The Ghost Boot Sequence
// -----------------------
// - This is intentionally one big file at the moment, so that we don't have to follow boot logic all over the place
// - This file is FULL of debug statements so we can see timings for the various steps because the boot needs to be as fast as possible
// - As we manage to break the codebase down into distinct components for e.g. the frontend, their boot logic can be offloaded to them
// - app.js is separate as the first example of each component having it's own app.js file colocated with it, instead of inside of server/web
// IMPORTANT: The only global requires here should be overrides + debug so we can monitor timings with DEBUG=ghost:boot* node ghost
require('./server/overrides');
const debug = require('ghost-ignition').debug('boot');
// END OF GLOBAL REQUIRES
/**
* Helper class to create consistent log messages
*/class BootLogger {
constructor(logging, startTime) {
this.logging = logging;
this.startTime = startTime;
}
log(message) {
let {logging, startTime} = this;
logging.info(`Ghost ${message} in ${(Date.now() - startTime) / 1000}s`);
}
}
/**
* Helper function to handle sending server ready notifications
*/
function notifyServerReady(error) {
const notify = require('./server/notify');
if (error) {
debug('Notifying server ready (error)');
notify.notifyServerReady(error);
} else {
debug('Notifying server ready (success)');
notify.notifyServerReady();
}
}
/**
* Get the Database into a ready state
* - DatabaseStateManager handles doing all this for us
* - Passing logging makes it output state messages
*/
async function initDatabase({config, logging}) {
const DatabaseStateManager = require('./server/data/db/state-manager');
const dbStateManager = new DatabaseStateManager({knexMigratorFilePath: config.get('paths:appRoot')});
await dbStateManager.makeReady({logging});
}
/**
* Core is intended to be all the bits of Ghost that are fundamental and we can't do anything without them!
* (There's more to do to make this true)
*/
async function initCore({ghostServer}) {
debug('Begin: initCore');
// Initialize Ghost core internationalization - this is basically used to colocate all of our error message strings
debug('Begin: i18n');
const {i18n} = require('./server/lib/common');
i18n.init();
debug('End: i18n');
// Models are the heart of Ghost - this is a syncronous operation
debug('Begin: models');
const models = require('./server/models');
models.init();
debug('End: models');
// Settings are a core concept we use settings to store key-value pairs used in critical pathways as well as public data like the site title
debug('Begin: settings');
const settings = require('./server/services/settings');
await settings.init();
debug('End: settings');
// The URLService is a core part of Ghost, which depends on models. It needs moving from the frontend to make this clear.
debug('Begin: Url Service');
const urlService = require('./frontend/services/url');
// Note: there is no await here, we do not wait for the url service to finish
// We can return, but the site will remain in (the shared, not global) maintenance mode until this finishes
// This is managed on request: https://github.com/TryGhost/Ghost/blob/main/core/server/web/shared/middlewares/maintenance.js#L13
urlService.init();
debug('End: Url Service');
// Job Service allows parts of Ghost to run in the background
debug('Begin: Job Service');
const jobService = require('./server/services/jobs');
ghostServer.registerCleanupTask(async () => {
await jobService.shutdown();
});
debug('End: Job Service');
debug('End: initCore');
}
/**
* Frontend is intended to be just Ghost's frontend
* This is technically wrong currently because the theme & frontend settings services contain code used by the API to upload themes & settings
*/
async function initFrontend() {
debug('Begin: initFrontend');
debug('Begin: Frontend Settings');
const frontendSettings = require('./frontend/services/settings');
await frontendSettings.init();
debug('End: Frontend Settings');
debug('Begin: Themes');
const themeService = require('./frontend/services/themes');
await themeService.init();
debug('End: Themes');
debug('End: initFrontend');
}
/**
* At the moment we load our express apps all in one go, they require themselves and are co-located
* What we want is to be able to optionally load various components and mount them
* So eventually this function should go away
*/
async function initExpressApps() {
debug('Begin: initExpressApps');
const parentApp = require('./server/web/parent/app')();
debug('End: initExpressApps');
return parentApp;
}
/**
* Services are components that make up part of Ghost and need initialising on boot
* These services should all be part of core, frontend services should be loaded with the frontend
* We are working towards this being a service loader, with the ability to make certain services optional
*/
async function initServices({config}) {
debug('Begin: initServices');
const defaultApiVersion = config.get('api:versions:default');
debug(`Default API Version: ${defaultApiVersion}`);
debug('Begin: Dynamic Routing');
// Dynamic routing is generated from the routes.yaml file, which is part of the settings service
// When Ghost's DB and core are loaded, we can access this file and call routing.bootstrap.start
// However this _must_ happen after the express Apps are loaded, hence why this is here and not in initFrontend
// Routing is currently tightly coupled between the frontend and backend
const routing = require('./frontend/services/routing');
const bridge = require('./shared/bridge');
// We pass the frontend API version here, so that the frontend services are slightly less tightly-coupled
routing.bootstrap.start(bridge.getFrontendApiVersion());
const settings = require('./server/services/settings');
const frontendSettings = require('./frontend/services/settings');
const getRoutesHash = () => frontendSettings.getCurrentHash('routes');
await settings.syncRoutesHash(getRoutesHash);
debug('End: Dynamic Routing');
debug('Begin: Services');
const permissions = require('./server/services/permissions');
const xmlrpc = require('./server/services/xmlrpc');
const slack = require('./server/services/slack');
const {mega} = require('./server/services/mega');
const webhooks = require('./server/services/webhooks');
const appService = require('./frontend/services/apps');
const limits = require('./server/services/limits');
const scheduling = require('./server/adapters/scheduling');
const urlUtils = require('./shared/url-utils');
await Promise.all([
permissions.init(),
xmlrpc.listen(),
slack.listen(),
mega.listen(),
webhooks.listen(),
appService.init(),
limits.init(),
scheduling.init({
apiUrl: urlUtils.urlFor('api', {version: defaultApiVersion, versionType: 'admin'}, true)
})
]);
debug('End: Services');
// Initialise analytics events
if (config.get('segment:key')) {
require('./server/analytics-events').init();
}
debug('End: initServices');
}
/**
* Kick off recurring jobs and background services
* These are things that happen on boot, but we don't need to wait for them to finish
* Later, this might be a service hook
*/
async function initBackgroundServices({config}) {
debug('Begin: initBackgroundServices');
// we don't want to kick off background services that will interfere with tests
if (process.env.NODE_ENV.match(/^testing/)) {
return;
}
// Load email analytics recurring jobs
if (config.get('backgroundJobs:emailAnalytics')) {
const emailAnalyticsJobs = require('./server/services/email-analytics/jobs');
await emailAnalyticsJobs.scheduleRecurringJobs();
}
// Load all inactive themes
const themeService = require('./frontend/services/themes');
themeService.loadInactiveThemes();
debug('End: initBackgroundServices');
}
/**
* ----------------------------------
* Boot Ghost - The magic starts here
* ----------------------------------
*
* - This function is written with async/await so you can read, line by line, what happens on boot
* - All the functions above handle init/boot logic for a single component
*/
async function bootGhost() {
// Metrics
const startTime = Date.now();
debug('Begin Boot');
// We need access to these variables in both the try and catch block
let bootLogger;
let config;
let ghostServer;
let logging;
// These require their own try-catch block and error format, because we can't log an error if logging isn't working
try {
// Step 0 - Load config and logging - fundamental required components
// Config must be the first thing we do, because it is required for absolutely everything
debug('Begin: Load config');
config = require('./shared/config');
debug('End: Load config');
// Logging is used absolutely everywhere
debug('Begin: Load logging');
logging = require('./shared/logging');
bootLogger = new BootLogger(logging, startTime);
debug('End: Load logging');
// At this point logging is required, so we can handle errors better
} catch (error) {
console.error(error); // eslint-disable-line no-console
process.exit(1);
}
try {
// Step 1 - require more fundamental components
// Version is required by sentry & Migration config & so is fundamental to booting
// However, it involves reading package.json so its slow & it's here for visibility on that slowness
debug('Begin: Load version info');
require('./server/lib/ghost-version');
debug('End: Load version info');
// Sentry must be initialised early, but requires config
debug('Begin: Load sentry');
require('./shared/sentry');
debug('End: Load sentry');
// Step 2 - Start server with minimal app in global maintenance mode
debug('Begin: load server + minimal app');
const rootApp = require('./app');
const GhostServer = require('./server/ghost-server');
ghostServer = new GhostServer();
await ghostServer.start(rootApp);
bootLogger.log('server started');
debug('End: load server + minimal app');
// Step 3 - Get the DB ready
debug('Begin: Get DB ready');
await initDatabase({config, logging});
bootLogger.log('database ready');
debug('End: Get DB ready');
// Step 4 - Load Ghost with all its services
debug('Begin: Load Ghost Services & Apps');
await initCore({ghostServer});
await initFrontend();
const ghostApp = await initExpressApps({});
await initServices({config});
debug('End: Load Ghost Services & Apps');
// Step 5 - Mount the full Ghost app onto the minimal root app & disable maintenance mode
debug('Begin: mountGhost');
const urlUtils = require('./shared/url-utils');
rootApp.disable('maintenance');
rootApp.use(urlUtils.getSubdir(), ghostApp);
debug('End: mountGhost');
// Step 6 - We are technically done here - let everyone know!
bootLogger.log('booted');
notifyServerReady();
// Step 7 - Init our background services, we don't wait for this to finish
initBackgroundServices({config});
// We return the server purely for testing purposes
debug('End Boot: Returning Ghost Server');
return ghostServer;
} catch (error) {
const errors = require('@tryghost/errors');
// Ensure the error we have is an ignition error
let serverStartError = error;
if (!errors.utils.isIgnitionError(serverStartError)) {
serverStartError = new errors.GhostError({message: serverStartError.message, err: serverStartError});
}
logging.error(serverStartError);
// If ghost was started and something else went wrong, we shut it down
if (ghostServer) {
notifyServerReady(serverStartError);
ghostServer.shutdown(2);
} else {
// Ghost server failed to start, set a timeout to give logging a chance to flush
setTimeout(() => {
process.exit(2);
}, 100);
}
}
}
module.exports = bootGhost;