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flo.js
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flo.js
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/**
* Copyright (c) 2014, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
'use strict';
var fs = require('fs');
var path = require('path');
var sane = require('sane');
var assert = require('assert');
var Server = require('./server');
var EventEmitter = require('events').EventEmitter;
module.exports = flo;
/**
* Top-level API for flo. Defaults params and instantiates `Flo`.
*
* @param {string} dir
* @param {object} options
* @param {function} callback
* @return {Flo}
* @public
*/
function flo(dir, options, callback) {
if (typeof options === 'function') {
callback = options;
options = null;
}
dir = path.resolve(dir);
options = options || {};
options = {
port: options.port || 8888,
host: options.host || 'localhost',
verbose: options.verbose || false,
glob: options.glob || [],
useWatchman: options.useWatchman || false,
useFilePolling: options.useFilePolling || false,
pollingInterval: options.pollingInterval,
watchDotFiles: options.watchDotFiles || false
};
callback = callback || noBuildCallback(dir);
return new Flo(dir, options, callback);
}
/**
* Time before we emit the ready event.
*/
var DELAY = 200;
/**
* Starts the server and the watcher and handles the piping between both and the
* resolver callback.
*
* @param {string} dir
* @param {object} options
* @param {function} callback
* @class Flo
* @private
*/
function Flo(dir, options, callback) {
this.log = logger(options.verbose, 'Flo');
this.dir = dir;
this.realpathdir = fs.realpathSync(dir);
this.resolver = callback;
this.server = new Server({
port: options.port,
host: options.host,
log: logger(options.verbose, 'Server')
});
this.watcher = new sane(dir, {
glob: options.glob,
poll: options.useFilePolling,
interval: options.pollingInterval,
watchman: options.useWatchman,
dot: options.watchDotFiles
});
this.watcher.on('change', this.onFileChange.bind(this));
this.watcher.on('ready', this.emit.bind(this, 'ready'));
this.watcher.on('error', this.emit.bind(this, 'error'));
}
Flo.prototype.__proto__ = EventEmitter.prototype;
/**
* Handles file changes.
*
* @param {string} filepath
* @private
*/
Flo.prototype.onFileChange = function(filepath) {
this.log('File changed', filepath);
var server = this.server;
this.resolver(filepath, function(resource) {
resource = normalizeResource(resource);
server.broadcast(resource);
});
};
/**
* Closes the server and the watcher.
*
* @public
*/
Flo.prototype.close = function() {
this.log('Shutting down flo');
this.watcher.close();
this.server.close();
};
/**
* Creates a logger for a given module.
*
* @param {boolean} verbose
* @param {string} moduleName
* @private
*/
function logger(verbose, moduleName) {
var slice = [].slice;
return function() {
var args = slice.call(arguments);
args[0] = '[' + moduleName + '] ' + args[0];
if (verbose) {
console.log.apply(console, args);
}
}
}
/**
* Check if an object is of type RegExp.
*
* @param {*} o
* @return {boolean}
* @private
*/
function isRegExp(o) {
return o && typeof o === 'object' &&
Object.prototype.toString.call(o) === '[object RegExp]';
}
/**
* Given a resource, enforce type checks, default params, and prepare for
* serialization.
*
* @param {*} o
* @return {boolean}
* @private
*/
function normalizeResource(resource) {
if (resource.reload) {
return resource;
}
assert(resource.resourceURL, 'expecting resourceURL');
assert(resource.contents != null, 'expecting contents');
var ret = {};
ret.match = resource.match || 'indexOf';
ret.contents = resource.contents.toString();
ret.resourceURL = resource.resourceURL;
if ('function' === typeof resource.update) {
ret.update = resource.update.toString();
}
if (path.sep === '\\') {
ret.resourceURL = ret.resourceURL.replace(/\\/g, '/');
}
assert.ok(
isRegExp(ret.match) ||
['indexOf', 'equal'].indexOf(ret.match) > -1,
'resource.match must be of type function, or regexp, ' +
'or a string either "indexOf" or "equal'
);
if (isRegExp(ret.match)) {
var r = ret.match;
ret.match = {
type: 'regexp',
source: r.source,
global: r.global,
multiline: r.multiline,
ignoreCase: r.ignoreCase
};
}
return ret;
}
/**
* Default resolver callback that will simply read the file and pass back the
* filename relative to the watched dir as the url.
*
* @param {string} dir
* @return {function}
* @private
*/
function noBuildCallback(dir) {
return function(filepath, callback) {
fs.readFile(path.join(dir, filepath), function(err, data) {
// Todo better error handling.
if (err) {
throw err;
}
callback({
resourceURL: filepath,
contents: data.toString()
});
});
};
}