Graceful startup and shutdown of HTTP server.

Author: scottgonzalez

scripts/update-server.js

@@ -2,31 +2,58 @@ var http = require( "http" ),
 	hook = require( "../lib/hook" ),
 	logger = require( "../lib/logger" );
 
+var port = (function() {
+	var index = process.argv.indexOf( "-p" );
+	return index === -1 ? 8001 : +process.argv[ index + 1 ];
+})();
+
 process.on( "uncaughtException", function( error ) {
 	logger.error( "Uncaught exception: " + error.stack );
 });
 
-http.createServer(function( request, response ) {
+var server = http.createServer(function( request, response ) {
 	var json = "";
 	request.setEncoding( "utf8" );
 	request.on( "data", function( chunk ) {
 		json += chunk;
 	});
-	request.on( "end", function() {
-		response.writeHead( 200 );
-		response.end();
 
+	request.on( "end", function() {
 		try {
 			json = JSON.parse( json );
 		} catch( e ) {
+			// Invalid JSON, stop processing
 			logger.error( "Invalid request: " + json );
+			response.writeHead( 400 );
+			response.end();
 			return;
 		}
 
+		// Accept the request and close the connection
+		response.writeHead( 202 );
+		response.end();
+
+		// Process the request
 		hook.processHook( json, function( error ) {
 			if ( error ) {
 				logger.error( "Error processing hook: " + error.stack );
 			}
 		});
 	});
-}).listen( 8001 );
+});
+
+// If another process is using this port, keep retrying
+server.on( "error", function( error ) {
+	if ( error.code === "EADDRINUSE" ) {
+		return setTimeout(function() {
+			// server.close();
+			server.listen( port );
+		}, 100 );
+	}
+});
+
+server.listen( port );
+
+process.on( "SIGINT", function() {
+	server.close();
+});