Commit | Line | Data |
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8114d10e JB |
1 | import fs from 'fs'; |
2 | ||
9d7484a4 JB |
3 | import { FileType } from '../types/FileType'; |
4 | import FileUtils from '../utils/FileUtils'; | |
9d7484a4 | 5 | import logger from '../utils/Logger'; |
8114d10e | 6 | import Utils from '../utils/Utils'; |
9d7484a4 JB |
7 | |
8 | export default class AuthorizedTagsCache { | |
9 | private static instance: AuthorizedTagsCache | null = null; | |
10 | private readonly tagsCaches: Map<string, string[]>; | |
11 | private readonly FSWatchers: Map<string, fs.FSWatcher>; | |
12 | ||
13 | private constructor() { | |
14 | this.tagsCaches = new Map<string, string[]>(); | |
15 | this.FSWatchers = new Map<string, fs.FSWatcher>(); | |
16 | } | |
17 | ||
18 | public static getInstance(): AuthorizedTagsCache { | |
1ca780f9 | 19 | if (AuthorizedTagsCache.instance === null) { |
9d7484a4 JB |
20 | AuthorizedTagsCache.instance = new AuthorizedTagsCache(); |
21 | } | |
22 | return AuthorizedTagsCache.instance; | |
23 | } | |
24 | ||
25 | public getAuthorizedTags(file: string): string[] { | |
26 | if (!this.hasTags(file)) { | |
27 | this.setTags(file, this.getAuthorizedTagsFromFile(file)); | |
28 | // Monitor authorization file | |
29 | !this.FSWatchers.has(file) && | |
30 | this.FSWatchers.set( | |
31 | file, | |
32 | FileUtils.watchJsonFile( | |
33 | this.logPrefix(file), | |
34 | FileType.Authorization, | |
35 | file, | |
36 | null, | |
37 | (event, filename) => { | |
38 | if (filename && event === 'change') { | |
39 | try { | |
40 | logger.debug( | |
41 | this.logPrefix(file) + | |
42 | ' ' + | |
43 | FileType.Authorization + | |
44 | ' file have changed, reload' | |
45 | ); | |
46 | this.deleteTags(file); | |
47 | this.deleteFSWatcher(file); | |
48 | } catch (error) { | |
49 | FileUtils.handleFileException( | |
50 | this.logPrefix(file), | |
51 | FileType.Authorization, | |
52 | file, | |
53 | error as NodeJS.ErrnoException, | |
54 | { | |
55 | throwError: false, | |
56 | } | |
57 | ); | |
58 | } | |
59 | } | |
60 | } | |
61 | ) | |
62 | ); | |
63 | } | |
64 | return this.getTags(file); | |
65 | } | |
66 | ||
67 | private hasTags(file: string): boolean { | |
68 | return this.tagsCaches.has(file); | |
69 | } | |
70 | ||
71 | private setTags(file: string, tags: string[]) { | |
72 | return this.tagsCaches.set(file, tags); | |
73 | } | |
74 | ||
75 | private getTags(file: string): string[] { | |
76 | return this.tagsCaches.get(file); | |
77 | } | |
78 | ||
79 | private deleteTags(file: string): boolean { | |
80 | return this.tagsCaches.delete(file); | |
81 | } | |
82 | ||
83 | private deleteFSWatcher(file: string): boolean { | |
84 | this.FSWatchers.get(file).close(); | |
85 | return this.FSWatchers.delete(file); | |
86 | } | |
87 | ||
88 | private getAuthorizedTagsFromFile(file: string): string[] { | |
89 | let authorizedTags: string[] = []; | |
90 | if (file) { | |
91 | try { | |
92 | // Load authorization file | |
93 | authorizedTags = JSON.parse(fs.readFileSync(file, 'utf8')) as string[]; | |
94 | } catch (error) { | |
95 | FileUtils.handleFileException( | |
96 | this.logPrefix(file), | |
97 | FileType.Authorization, | |
98 | file, | |
99 | error as NodeJS.ErrnoException | |
100 | ); | |
101 | } | |
102 | } else { | |
103 | logger.info(this.logPrefix(file) + ' No authorization file given)'); | |
104 | } | |
105 | return authorizedTags; | |
106 | } | |
107 | ||
108 | private logPrefix(file: string): string { | |
109 | return Utils.logPrefix(` Authorized tags cache for authorization file '${file}' |`); | |
110 | } | |
111 | } |