Refactored server announce functions to be clearer

- the announce functions exist for the purpose of communicating with Ghost CLI
- the functions were called announceServerStart and announceServerStopped, which implies they tell Ghost CLI when the server starts and stops
- however, the true intention / purpose of these functions is to:
    - either tell Ghost CLI when Ghost has successfully booted (e.g. is ready to serve requests)
    - or tell Ghost CLI when the server failed to boot, and report the error so that Ghost CLI can communicate it to the user
- therefore, I've refactored the old functions into 1 function to make it clearer they do the same job, but with 2 different states
- also added some tests :D

core/index.js

@@ -16,7 +16,7 @@ function makeGhost(options) {
                 err = new errors.GhostError({message: err.message, err: err});
             }
 
-            return GhostServer.announceServerStopped(err)
+            return GhostServer.announceServerReadiness(err)
                 .finally(() => {
                     throw err;
                 });

core/server/ghost-server.js

@@ -29,13 +29,6 @@ function GhostServer(rootApp) {
     this.config = config;
 }
 
-const debugInfo = {
-    versions: process.versions,
-    platform: process.platform,
-    arch: process.arch,
-    release: process.release
-};
-
 /**
  * ## Public API methods
  *
@@ -109,7 +102,7 @@ GhostServer.prototype.start = function (externalApp) {
             debug('...Started');
             self.logStartMessages();
 
-            return GhostServer.announceServerStart()
+            return GhostServer.announceServerReadiness()
                 .finally(() => {
                     resolve(self);
                 });
@@ -249,65 +242,50 @@ GhostServer.prototype.logShutdownMessages = function () {
 module.exports = GhostServer;
 
 /**
- * @NOTE announceServerStartCalled:
+ * We call announce server readiness when the server is ready
+ * When the server is started, but not ready, it is only able to serve 503s
  *
- * - backwards compatible logic, because people complained that not all themes were loaded when using Ghost as NPM module
- * - we told them to call `announceServerStart`, which is not required anymore, because we restructured the code
+ * If the server isn't able to reach readiness, announceServerReadiness is called with an error
+ * A status message, any error, and debug info are all passed to managing processes via IPC and the bootstrap socket
  */
-let announceServerStartCalled = false;
-module.exports.announceServerStart = function announceServerStart() {
-    if (announceServerStartCalled || config.get('maintenance:enabled')) {
+let announceServerReadinessCalled = false;
+
+const debugInfo = {
+    versions: process.versions,
+    platform: process.platform,
+    arch: process.arch,
+    release: process.release
+};
+
+module.exports.announceServerReadiness = function (error = null) {
+    // If we already announced readiness, we should not do it again
+    if (announceServerReadinessCalled) {
         return Promise.resolve();
     }
-    announceServerStartCalled = true;
 
-    let socketAddress = config.get('bootstrap-socket');
+    // Mark this function as called
+    announceServerReadinessCalled = true;
+
+    // Build our message
+    // - if there's no error then the server is ready
     let message = {
         started: true,
         debug: debugInfo
     };
 
-    events.emit('server.start');
+    // - if there's an error then the server is not ready, include the errors
+    if (error) {
+        message.started = false;
+        message.error = error;
+    }
 
-    // CASE: IPC communication to the CLI via child process.
+    // CASE: IPC communication to the CLI for local process manager
     if (process.send) {
         process.send(message);
     }
 
-    // CASE: Ghost extension - bootstrap sockets
-    if (socketAddress) {
-        return bootstrapSocket.connectAndSend(socketAddress, logging, message);
-    }
-
-    return Promise.resolve();
-};
-
-/**
- * @NOTE announceServerStopCalled:
- *
- * - backwards compatible logic, because people complained that not all themes were loaded when using Ghost as NPM module
- * - we told them to call `announceServerStart`, which is not required anymore, because we restructured code
- */
-let announceServerStopCalled = false;
-module.exports.announceServerStopped = function announceServerStopped(error) {
-    if (announceServerStopCalled) {
-        return Promise.resolve();
-    }
-    announceServerStopCalled = true;
-
+    // CASE: use bootstrap socket to communicate with CLI for systemd
     let socketAddress = config.get('bootstrap-socket');
-    let message = {
-        started: false,
-        error: error,
-        debug: debugInfo
-    };
-
-    // CASE: IPC communication to the CLI via child process.
-    if (process.send) {
-        process.send(message);
-    }
-
-    // CASE: Ghost extension - bootstrap sockets
     if (socketAddress) {
         return bootstrapSocket.connectAndSend(socketAddress, logging, message);
     }

core/server/index.js

@@ -138,10 +138,10 @@ const minimalRequiredSetupToStartGhost = (dbState) => {
                     .then(() => {
                         config.set('maintenance:enabled', false);
                         logging.info('Blog is out of maintenance mode.');
-                        return GhostServer.announceServerStart();
+                        return GhostServer.announceServerReadiness();
                     })
                     .catch((err) => {
-                        return GhostServer.announceServerStopped(err)
+                        return GhostServer.announceServerReadiness(err)
                             .finally(() => {
                                 logging.error(err);
                                 setTimeout(() => {

test/unit/server/ghost-server_spec.js

@@ -0,0 +1,100 @@
+const should = require('should');
+const sinon = require('sinon');
+
+const configUtils = require('../../utils/configUtils');
+
+const bootstrapSocket = require('@tryghost/bootstrap-socket');
+
+describe('GhostServer', function () {
+    describe('announceServerReadiness', function () {
+        let GhostServer;
+        let socketStub;
+
+        beforeEach(function () {
+            // Have to re-require each time to clear the internal flag
+            delete require.cache[require.resolve('../../../core/server/ghost-server')];
+            GhostServer = require('../../../core/server/ghost-server');
+
+            // process.send isn't set for tests, we can safely override;
+            process.send = sinon.stub();
+
+            // stub socket connectAndSend method
+            socketStub = sinon.stub(bootstrapSocket, 'connectAndSend');
+        });
+
+        afterEach(function () {
+            process.send = undefined;
+            configUtils.restore();
+            socketStub.restore();
+        });
+
+        it('it resolves a promise', function () {
+            GhostServer.announceServerReadiness().should.be.fulfilled();
+        });
+
+        it('it communicates with IPC correctly on success', function () {
+            GhostServer.announceServerReadiness();
+
+            process.send.calledOnce.should.be.true();
+
+            let message = process.send.firstCall.args[0];
+            message.should.be.an.Object().with.properties('started', 'debug');
+            message.should.not.have.property('error');
+            message.started.should.be.true();
+        });
+
+        it('communicates with IPC correctly on failure', function () {
+            GhostServer.announceServerReadiness(new Error('something went wrong'));
+
+            process.send.calledOnce.should.be.true();
+
+            let message = process.send.firstCall.args[0];
+            message.should.be.an.Object().with.properties('started', 'debug', 'error');
+            message.started.should.be.false();
+            message.error.should.be.an.Object().with.properties('message');
+            message.error.message.should.eql('something went wrong');
+        });
+
+        it('communicates via bootstrap socket correctly on success', function () {
+            configUtils.set('bootstrap-socket', 'testing');
+
+            GhostServer.announceServerReadiness();
+
+            socketStub.calledOnce.should.be.true();
+            socketStub.firstCall.args[0].should.eql('testing');
+            socketStub.firstCall.args[1].should.be.an.Object().with.properties('info', 'warn');
+
+            let message = socketStub.firstCall.args[2];
+            message.should.be.an.Object().with.properties('started', 'debug');
+            message.should.not.have.property('error');
+            message.started.should.be.true();
+        });
+
+        it('communicates via bootstrap socket correctly on failure', function () {
+            configUtils.set('bootstrap-socket', 'testing');
+
+            GhostServer.announceServerReadiness(new Error('something went wrong'));
+
+            socketStub.calledOnce.should.be.true();
+            socketStub.firstCall.args[0].should.eql('testing');
+            socketStub.firstCall.args[1].should.be.an.Object().with.properties('info', 'warn');
+
+            let message = socketStub.firstCall.args[2];
+            message.should.be.an.Object().with.properties('started', 'debug', 'error');
+            message.started.should.be.false();
+            message.error.should.be.an.Object().with.properties('message');
+            message.error.message.should.eql('something went wrong');
+        });
+
+        it('can be called multiple times, but only communicates once', function () {
+            configUtils.set('bootstrap-socket', 'testing');
+
+            GhostServer.announceServerReadiness();
+            GhostServer.announceServerReadiness(new Error('something went wrong'));
+            GhostServer.announceServerReadiness();
+
+            process.send.calledOnce.should.be.true();
+            socketStub.calledOnce.should.be.true();
+        });
+    });
+});

test/utils/index.js

@@ -946,7 +946,7 @@ startGhost = function startGhost(options) {
         .then(function () {
             let timeout;
 
-            GhostServer.announceServerStart();
+            GhostServer.announceServerReadiness();
 
             return new Promise(function (resolve) {
                 (function retry() {