| 1 | 'use strict';
|
| 2 |
|
| 3 | var async = require('async');
|
| 4 | var fs = require('fs');
|
| 5 | var path = require('path');
|
| 6 | var utils = require('./utils');
|
| 7 |
|
| 8 | class CacheChain {
|
| 9 |
|
| 10 | constructor(caches, root, serveDir) {
|
| 11 | this.caches = caches;
|
| 12 | this.root = root;
|
| 13 | this.serveDir = serveDir;
|
| 14 | }
|
| 15 |
|
| 16 | get(localFilename) {
|
| 17 | return new Promise((resolved, rejected) => {
|
| 18 | this.caches[0].get(utils.localToRemoteFilename(localFilename, this.root, this.serveDir)).then((result) => {
|
| 19 | if (!result) return resolved();
|
| 20 | async.reduce(result.files, new Date(0), (date, filename, next) => {
|
| 21 | var testForFilename = path.resolve(path.dirname(localFilename), filename);
|
| 22 | fs.access(testForFilename, (err) => {
|
| 23 | if (err) return this.invalidate(localFilename).then(resolved, rejected);
|
| 24 | fs.stat(path.resolve(path.dirname(localFilename), filename), (err, stats) => {
|
| 25 | if (err) return next(err);
|
| 26 | var modificationDate = stats.mtime > stats.ctime ? stats.mtime : stats.ctime;
|
| 27 | next(null, modificationDate > date ? modificationDate : date);
|
| 28 | });
|
| 29 | });
|
| 30 | }, (err, date) => {
|
| 31 | if (err) return rejected(err);
|
| 32 | if (date > result.modificationDate) {
|
| 33 | return this.invalidate(localFilename).then(resolved, rejected);
|
| 34 | }
|
| 35 | resolved(result);
|
| 36 | });
|
| 37 | }, rejected);
|
| 38 | });
|
| 39 | }
|
| 40 |
|
| 41 | set(filename, data) {
|
| 42 | return this.caches[0].set(utils.localToRemoteFilename(filename, this.root, this.serveDir), data);
|
| 43 | }
|
| 44 |
|
| 45 | invalidate(filename, data) {
|
| 46 | return this.caches[0].invalidate(utils.localToRemoteFilename(filename, this.root, this.serveDir));
|
| 47 | }
|
| 48 |
|
| 49 | }
|
| 50 |
|
| 51 | module.exports = exports = CacheChain;
|