85 lines
2.1 KiB
JavaScript
85 lines
2.1 KiB
JavaScript
/* jslint node: true */
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'use strict';
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var Config = require('./config.js').config;
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var Log = require('./logger.js').log;
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var paths = require('path');
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var fs = require('fs');
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var Gaze = require('gaze').Gaze;
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var events = require('events');
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var util = require('util');
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var assert = require('assert');
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var hjson = require('hjson');
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var _ = require('lodash');
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function ConfigCache() {
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events.EventEmitter.call(this);
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var self = this;
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this.cache = {}; // filePath -> HJSON
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this.gaze = new Gaze();
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this.reCacheConfigFromFile = function(filePath, cb) {
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fs.readFile(filePath, { encoding : 'utf-8' }, function fileRead(err, data) {
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try {
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self.cache[filePath] = hjson.parse(data);
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cb(null, self.cache[filePath]);
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} catch(e) {
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Log.error( { filePath : filePath, error : e.toString() }, 'Failed recaching');
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cb(e);
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}
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});
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};
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this.gaze.on('error', function gazeErr(err) {
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});
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this.gaze.on('changed', function fileChanged(filePath) {
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assert(filePath in self.cache);
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Log.info( { filePath : filePath }, 'Configuration file changed; recaching');
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self.reCacheConfigFromFile(filePath, function reCached(err) {
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if(err) {
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Log.error( { error : err, filePath : filePath } , 'Error recaching HJSON config');
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} else {
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self.emit('recached', filePath);
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}
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});
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});
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}
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util.inherits(ConfigCache, events.EventEmitter);
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ConfigCache.prototype.getConfigWithOptions = function(options, cb) {
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assert(_.isString(options.filePath));
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var self = this;
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var isCached = (options.filePath in this.cache);
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if(options.forceReCache || !isCached) {
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this.reCacheConfigFromFile(options.filePath, function fileCached(err, config) {
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if(!err && !isCached) {
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self.gaze.add(options.filePath);
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}
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cb(err, config, true);
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});
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} else {
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cb(null, this.cache[options.filePath], false);
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}
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};
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ConfigCache.prototype.getConfig = function(filePath, cb) {
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this.getConfigWithOptions( { filePath : filePath }, cb);
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};
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ConfigCache.prototype.getModConfig = function(fileName, cb) {
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this.getConfig(paths.join(Config.paths.mods, fileName), cb);
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};
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module.exports = exports = new ConfigCache(); |