65 lines
1.5 KiB
JavaScript
65 lines
1.5 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 stripJsonComments = require('strip-json-comments');
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var assert = require('assert');
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module.exports = exports = new JSONCache();
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function JSONCache() {
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var self = this;
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this.cache = {}; // filePath -> JSON
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this.gaze = new Gaze();
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this.reCacheJSONFromFile = 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] = JSON.parse(stripJsonComments(data));
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cb(null, self.cache[filePath]);
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} catch(e) {
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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 }, 'JSON file changed; recaching');
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self.reCacheJSONFromFile(filePath, function reCached(err) {
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if(err) {
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Log.error( { error : err, filePath : filePath } , 'Error recaching JSON');
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}
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});
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});
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}
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JSONCache.prototype.getJSON = function(fileName, cb) {
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var self = this;
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var filePath = paths.join(Config.paths.mods, fileName);
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if(filePath in this.cache) {
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cb(null, this.cache[filePath], false);
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} else {
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this.reCacheJSONFromFile(filePath, function fileCached(err, json) {
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if(!err) {
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self.gaze.add(filePath);
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}
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cb(err, json, true);
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});
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}
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};
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