ghost/core/server/GhostServer.js

var Promise = require('bluebird'),
    fs = require('fs'),
    semver = require('semver'),
    packageInfo = require('../../package.json'),
    config = require('./config');

function GhostServer(app) {
    this.app = app;
    this.httpServer = null;
    this.connections = [];
    this.upgradeWarning = setTimeout(this.logUpgradeWarning.bind(this), 5000);

    // Expose config module for use externally.
    this.config = config;
}

GhostServer.prototype.connection = function (socket) {
    this.connections.push(socket);
};

// Most browsers keep a persistant connection open to the server
// which prevents the close callback of httpServer from returning
// We need to destroy all connections manually
GhostServer.prototype.closeConnections = function () {
    this.connections.forEach(function (socket) {
        socket.destroy();
    });
};

GhostServer.prototype.logStartMessages = function () {
    // Tell users if their node version is not supported, and exit
    if (!semver.satisfies(process.versions.node, packageInfo.engines.node)) {
        console.log(
            '\nERROR: Unsupported version of Node'.red,
            '\nGhost needs Node version'.red,
            packageInfo.engines.node.yellow,
            'you are using version'.red,
            process.versions.node.yellow,
            '\nPlease go to http://nodejs.org to get a supported version'.green
        );

        process.exit(0);
    }

    // Startup & Shutdown messages
    if (process.env.NODE_ENV === 'production') {
        console.log(
            'Ghost is running...'.green,
            '\nYour blog is now available on',
            config.url,
            '\nCtrl+C to shut down'.grey
        );

        // ensure that Ghost exits correctly on Ctrl+C
        process.removeAllListeners('SIGINT').on('SIGINT', function () {
            console.log(
                '\nGhost has shut down'.red,
                '\nYour blog is now offline'
            );
            process.exit(0);
        });
    } else {
        console.log(
            ('Ghost is running in ' + process.env.NODE_ENV + '...').green,
            '\nListening on',
                config.getSocket() || config.server.host + ':' + config.server.port,
            '\nUrl configured as:',
            config.url,
            '\nCtrl+C to shut down'.grey
        );
        // ensure that Ghost exits correctly on Ctrl+C
        process.removeAllListeners('SIGINT').on('SIGINT', function () {
            console.log(
                '\nGhost has shutdown'.red,
                '\nGhost was running for',
                Math.round(process.uptime()),
                'seconds'
            );
            process.exit(0);
        });
    }
};

GhostServer.prototype.logShutdownMessages = function () {
    console.log('Ghost is closing connections'.red);
};

GhostServer.prototype.logUpgradeWarning = function () {
    console.log('Warning: Ghost will no longer start automatically when using it as an npm module. Please see the docs(http://tinyurl.com/npm-upgrade) for information on how to update your code.'.red);
};

/**
 * Starts the ghost server listening on the configured port.
 * Alternatively you can pass in your own express instance and let Ghost
 * start lisetning for you.
 * @param  {Object=} externalApp Optional express app instance.
 * @return {Promise}
 */
GhostServer.prototype.start = function (externalApp) {
    var self = this,
        app = externalApp ? externalApp : self.app;

    // ## Start Ghost App
    return new Promise(function (resolve) {
        if (config.getSocket()) {
            // Make sure the socket is gone before trying to create another
            try {
                fs.unlinkSync(config.getSocket());
            } catch (e) {
                // We can ignore this.
            }

            self.httpServer = app.listen(
                config.getSocket()
            );

            fs.chmod(config.getSocket(), '0660');
        } else {
            self.httpServer = app.listen(
                config.server.port,
                config.server.host
            );
        }

        self.httpServer.on('error', function (error) {
            if (error.errno === 'EADDRINUSE') {
                console.log('ERROR: Cannot start Ghost. Another program is already using this port (is another Ghost instance already running?)'.red);
            } else {
                console.log(
                    'ERROR: There was an error starting your server. '.red,
                    ('(Code: ' + error.errno + ')').red
                );
            }
            process.exit(-1);
        });
        self.httpServer.on('connection', self.connection.bind(self));
        self.httpServer.on('listening', function () {
            self.logStartMessages();
            clearTimeout(self.upgradeWarning);
            resolve(self);
        });
    });
};

// Returns a promise that will be fulfilled when the server stops.
// If the server has not been started, the promise will be fulfilled
// immediately
GhostServer.prototype.stop = function () {
    var self = this;

    return new Promise(function (resolve) {
        if (self.httpServer === null) {
            resolve(self);
        } else {
            self.httpServer.close(function () {
                self.httpServer = null;
                self.logShutdownMessages();
                resolve(self);
            });

            self.closeConnections();
        }
    });
};

// Restarts the ghost application
GhostServer.prototype.restart = function () {
    return this.stop().then(this.start.bind(this));
};

// To be called after `stop`
GhostServer.prototype.hammertime = function () {
    console.log('Can\'t touch this'.green);

    return Promise.resolve(this);
};

module.exports = GhostServer;