✨ Signal ready/EADDRINUSE to a Java Hohenheim parent over the TCP IPC bridge

Author: skerit

lib/stages/90-server.js

@@ -290,7 +290,9 @@ const start = server.createStage('start', () => {
 			log.info('Served at »»', pretty_url, '««');
 		}
 
-		// If this process is a child, tell the parent we're ready
+		// If this process is a child, tell the parent we're ready.
+		// Under the Java Hohenheim there is no Node IPC channel: readiness
+		// travels over the HOHENHEIM_IPC_PORT TCP socket as flat JSON instead.
 		if (process.send) {
 			log.info('Letting the parent know we\'re ready!');
 			process.send({alchemy: {ready: true}});
@@ -299,6 +301,9 @@ const start = server.createStage('start', () => {
 				log.info('Parent exited, closing down');
 				process.exit();
 			});
+		} else if (alchemy.hohenheim_ipc_socket) {
+			log.info('Letting the Hohenheim parent know we\'re ready (TCP IPC)!');
+			alchemy.hohenheim_ipc_socket.write(JSON.stringify({type: 'ready'}) + '\n');
 		}
 
 		server.launch(true);
@@ -312,6 +317,11 @@ const start = server.createStage('start', () => {
 			return process.exit();
 		}
 
+		if (alchemy.hohenheim_ipc_socket) {
+			alchemy.hohenheim_ipc_socket.write(JSON.stringify({type: 'error', code: err && err.code}) + '\n');
+			return process.exit();
+		}
+
 		throw err;
 	});
 });