79 lines
2.6 KiB
JavaScript
79 lines
2.6 KiB
JavaScript
/* jslint node: true */
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'use strict';
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// deps
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const paths = require('path');
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const fs = require('graceful-fs');
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const hjson = require('hjson');
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const sane = require('sane');
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const _ = require('lodash');
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module.exports = new class ConfigCache
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{
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constructor() {
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this.cache = new Map(); // path->parsed config
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}
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getConfigWithOptions(options, cb) {
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options.hotReload = _.get(options, 'hotReload', true);
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const cached = this.cache.has(options.filePath);
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if(options.forceReCache || !cached) {
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this.recacheConfigFromFile(options.filePath, (err, config) => {
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if(!err && !cached) {
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if(options.hotReload) {
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const watcher = sane(
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paths.dirname(options.filePath),
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{
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glob : `**/${paths.basename(options.filePath)}`
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}
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);
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watcher.on('change', (fileName, fileRoot) => {
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require('./logger.js').log.info( { fileName, fileRoot }, 'Configuration file changed; re-caching');
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this.recacheConfigFromFile(paths.join(fileRoot, fileName), err => {
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if(!err) {
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if(options.callback) {
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options.callback( { fileName, fileRoot, configCache : this } );
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}
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}
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});
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});
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}
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}
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return cb(err, config, true);
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});
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} else {
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return cb(null, this.cache.get(options.filePath), false);
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}
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}
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getConfig(filePath, cb) {
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return this.getConfigWithOptions( { filePath }, cb);
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}
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recacheConfigFromFile(path, cb) {
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fs.readFile(path, { encoding : 'utf-8' }, (err, data) => {
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if(err) {
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return cb(err);
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}
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let parsed;
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try {
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parsed = hjson.parse(data);
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this.cache.set(path, parsed);
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} catch(e) {
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try {
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require('./logger.js').log.error( { filePath : path, error : e.message }, 'Failed to re-cache' );
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} catch(ignored) {
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// nothing - we may be failing to parse the config in which we can't log here!
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}
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return cb(e);
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}
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return cb(null, parsed);
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});
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}
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};
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