Added support for offloaded oneoff jobs

refs https://github.com/TryGhost/Toolbox/issues/357

- Adds support for persisted one off offloaded (worker thread) jobs
- To try them out run Ghost instance in "testmode" and shoo a request like so: `curl http://localhost:2368/ghost/api/oneoff/graceful-job` - this starts a one time job from graceful-job script (can only ever be executed once on the Ghost instance)
- Job's progress and runtime details are persisted in `jobs` table
- To play more with one off jobs use `addOneOffJob` method available on jobsService

ghost/core/core/server/models/job.js

@@ -0,0 +1,9 @@
+const ghostBookshelf = require('./base');
+
+const Job = ghostBookshelf.Model.extend({
+    tableName: 'jobs'
+});
+
+module.exports = {
+    Job: ghostBookshelf.model('Job', Job)
+};

ghost/core/core/server/services/jobs/job-service.js

@@ -5,6 +5,7 @@
 
 const JobManager = require('@tryghost/job-manager');
 const logging = require('@tryghost/logging');
+const models = require('../../models');
 const sentry = require('../../../shared/sentry');
 
 const errorHandler = (error, workerMeta) => {
@@ -38,7 +39,7 @@ const initTestMode = () => {
     }, 5000);
 };
 
-const jobManager = new JobManager({errorHandler, workerMessageHandler});
+const jobManager = new JobManager({errorHandler, workerMessageHandler, JobModel: models.Job});
 
 module.exports = jobManager;
 module.exports.initTestMode = initTestMode;

ghost/core/core/server/web/api/testmode/jobs/graceful-job.js

@@ -37,7 +37,7 @@ const internalContext = {context: {internal: true}};
 
     if (shutdown) {
         postParentPortMessage(`Job shutting down gracefully`);
-        process.exit(0);
+        parentPort.postMessage('done');
     }
 
     postParentPortMessage(`Fetching posts`);
@@ -46,5 +46,5 @@ const internalContext = {context: {internal: true}};
     postParentPortMessage(`Found ${posts.data.length} posts. First one: ${posts.data[0].toJSON().slug}`);
     postParentPortMessage('Graceful job has completed!');
 
-    process.exit(0);
+    parentPort.postMessage('done');
 })();

ghost/core/core/server/web/api/testmode/routes.js

@@ -44,6 +44,20 @@ module.exports = function testRoutes() {
         res.sendStatus(202);
     });
 
+    router.get('/oneoff/:name', (req, res) => {
+        logging.info('Create Slow Job with timeout of', req.params.name);
+
+        const options = {};
+
+        options.solo = true;
+        options.name = req.params.name;
+        options.job = path.resolve(__dirname, 'jobs', `${options.name}.js`);
+
+        jobsService.addOneOffJob(options);
+
+        res.sendStatus(202);
+    });
+
     router.get('/schedule/:schedule/:name*?', (req, res) => {
         if (!req.params.schedule) {
             return res.sendStatus(400, 'schedule parameter cannot be mepty');

ghost/core/package.json

@@ -77,7 +77,7 @@
     "@tryghost/express-dynamic-redirects": "0.0.0",
     "@tryghost/helpers": "1.1.71",
     "@tryghost/image-transform": "1.1.0",
-    "@tryghost/job-manager": "0.8.25",
+    "@tryghost/job-manager": "0.9.0",
     "@tryghost/kg-card-factory": "3.1.3",
     "@tryghost/kg-default-atoms": "3.1.2",
     "@tryghost/kg-default-cards": "5.16.2",

yarn.lock

@@ -1748,10 +1748,10 @@
     "@tryghost/errors" "^1.2.14"
     jest-snapshot "^28.0.0"
 
-"@tryghost/job-manager@0.8.25":
+"@tryghost/job-manager@0.9.0":
-  version "0.8.25"
+  version "0.9.0"
-  resolved "https://registry.yarnpkg.com/@tryghost/job-manager/-/job-manager-0.8.25.tgz#9c208e4fa4ca4719c64a432b67039396cfdc0796"
+  resolved "https://registry.yarnpkg.com/@tryghost/job-manager/-/job-manager-0.9.0.tgz#ca6733f75cb927de3a52d633bc4ae3e73a026164"
-  integrity sha512-gkhhfWZFcpsfS4NqECqJvDIi8yIR+V7dngSsT9N011BOriwu5jr/weoGkGhIkZdIK79GNzVIHR9PBaAAEjZXNw==
+  integrity sha512-UGB1qqwLvqjPLGKAiC/qgCAhSGIZHUD6nxcdHtjIB9G1yGFGi6Ki2bu7QQRsmuttUWHxZzYeKLmhuCBuuEOZmw==
   dependencies:
     "@breejs/later" "^4.0.2"
     "@tryghost/logging" "^2.0.0"