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f911a4af JB |
1 | import fs from 'node:fs'; |
2 | ||
4c3c0d59 JB |
3 | import type { ChargingStation } from './ChargingStation'; |
4 | import { ChargingStationUtils } from './ChargingStationUtils'; | |
f911a4af | 5 | import { FileType, IdTagDistribution } from '../types'; |
51022aa0 | 6 | import { ErrorUtils, FileUtils, Utils, logger } from '../utils'; |
f911a4af JB |
7 | |
8 | type IdTagsCacheValueType = { | |
9 | idTags: string[]; | |
10 | idTagsFileWatcher: fs.FSWatcher | undefined; | |
11 | }; | |
12 | ||
13 | export class IdTagsCache { | |
14 | private static instance: IdTagsCache | null = null; | |
15 | private readonly idTagsCaches: Map<string, IdTagsCacheValueType>; | |
16 | private readonly idTagsCachesAddressableIndexes: Map<string, number>; | |
17 | ||
18 | private constructor() { | |
19 | this.idTagsCaches = new Map<string, IdTagsCacheValueType>(); | |
20 | this.idTagsCachesAddressableIndexes = new Map<string, number>(); | |
21 | } | |
22 | ||
23 | public static getInstance(): IdTagsCache { | |
24 | if (IdTagsCache.instance === null) { | |
25 | IdTagsCache.instance = new IdTagsCache(); | |
26 | } | |
27 | return IdTagsCache.instance; | |
28 | } | |
29 | ||
30 | public getIdTag( | |
31 | distribution: IdTagDistribution, | |
32 | chargingStation: ChargingStation, | |
33 | connectorId: number | |
34 | ): string { | |
35 | const hashId = chargingStation.stationInfo.hashId; | |
e302df1d | 36 | const idTagsFile = ChargingStationUtils.getIdTagsFile(chargingStation.stationInfo); |
f911a4af JB |
37 | switch (distribution) { |
38 | case IdTagDistribution.RANDOM: | |
39 | return this.getRandomIdTag(hashId, idTagsFile); | |
40 | case IdTagDistribution.ROUND_ROBIN: | |
41 | return this.getRoundRobinIdTag(hashId, idTagsFile); | |
42 | case IdTagDistribution.CONNECTOR_AFFINITY: | |
43 | return this.getConnectorAffinityIdTag(chargingStation, connectorId); | |
44 | default: | |
45 | return this.getRoundRobinIdTag(hashId, idTagsFile); | |
46 | } | |
47 | } | |
48 | ||
49 | public getIdTags(file: string): string[] | undefined { | |
50 | if (this.hasIdTagsCache(file) === false) { | |
51 | this.setIdTagsCache(file, this.getIdTagsFromFile(file)); | |
52 | } | |
53 | return this.getIdTagsCache(file); | |
54 | } | |
55 | ||
56 | public deleteIdTags(file: string): boolean { | |
57 | return this.deleteIdTagsCache(file); | |
58 | } | |
59 | ||
60 | private getRandomIdTag(hashId: string, file: string): string { | |
61 | const idTags = this.getIdTags(file); | |
32e8c8a5 | 62 | const addressableKey = this.getIdTagsCacheIndexesAddressableKey(file, hashId); |
f911a4af JB |
63 | this.idTagsCachesAddressableIndexes.set( |
64 | addressableKey, | |
65 | Math.floor(Utils.secureRandom() * idTags.length) | |
66 | ); | |
67 | return idTags[this.idTagsCachesAddressableIndexes.get(addressableKey)]; | |
68 | } | |
69 | ||
70 | private getRoundRobinIdTag(hashId: string, file: string): string { | |
71 | const idTags = this.getIdTags(file); | |
32e8c8a5 | 72 | const addressableKey = this.getIdTagsCacheIndexesAddressableKey(file, hashId); |
f911a4af JB |
73 | const idTagIndex = this.idTagsCachesAddressableIndexes.get(addressableKey) ?? 0; |
74 | const idTag = idTags[idTagIndex]; | |
75 | this.idTagsCachesAddressableIndexes.set( | |
76 | addressableKey, | |
77 | idTagIndex === idTags.length - 1 ? 0 : idTagIndex + 1 | |
78 | ); | |
79 | return idTag; | |
80 | } | |
81 | ||
82 | private getConnectorAffinityIdTag(chargingStation: ChargingStation, connectorId: number): string { | |
e302df1d | 83 | const file = ChargingStationUtils.getIdTagsFile(chargingStation.stationInfo); |
f911a4af | 84 | const idTags = this.getIdTags(file); |
728e01f0 JB |
85 | const addressableKey = this.getIdTagsCacheIndexesAddressableKey( |
86 | file, | |
87 | chargingStation.stationInfo.hashId | |
88 | ); | |
f911a4af JB |
89 | this.idTagsCachesAddressableIndexes.set( |
90 | addressableKey, | |
91 | (chargingStation.index - 1 + (connectorId - 1)) % idTags.length | |
92 | ); | |
93 | return idTags[this.idTagsCachesAddressableIndexes.get(addressableKey)]; | |
94 | } | |
95 | ||
96 | private hasIdTagsCache(file: string): boolean { | |
97 | return this.idTagsCaches.has(file); | |
98 | } | |
99 | ||
100 | private setIdTagsCache(file: string, idTags: string[]) { | |
101 | return this.idTagsCaches.set(file, { | |
102 | idTags, | |
103 | idTagsFileWatcher: FileUtils.watchJsonFile( | |
104 | file, | |
105 | FileType.Authorization, | |
106 | this.logPrefix(file), | |
107 | undefined, | |
108 | (event, filename) => { | |
109 | if (Utils.isNotEmptyString(filename) && event === 'change') { | |
110 | try { | |
111 | logger.debug( | |
112 | `${this.logPrefix(file)} ${FileType.Authorization} file have changed, reload` | |
113 | ); | |
114 | this.deleteIdTagsCache(file); | |
115 | this.deleteIdTagsCacheIndexes(file); | |
116 | } catch (error) { | |
51022aa0 | 117 | ErrorUtils.handleFileException( |
f911a4af JB |
118 | file, |
119 | FileType.Authorization, | |
120 | error as NodeJS.ErrnoException, | |
121 | this.logPrefix(file), | |
122 | { | |
123 | throwError: false, | |
124 | } | |
125 | ); | |
126 | } | |
127 | } | |
128 | } | |
129 | ), | |
130 | }); | |
131 | } | |
132 | ||
133 | private getIdTagsCache(file: string): string[] | undefined { | |
134 | return this.idTagsCaches.get(file)?.idTags; | |
135 | } | |
136 | ||
137 | private deleteIdTagsCache(file: string): boolean { | |
138 | this.idTagsCaches.get(file)?.idTagsFileWatcher?.close(); | |
139 | return this.idTagsCaches.delete(file); | |
140 | } | |
141 | ||
142 | private deleteIdTagsCacheIndexes(file: string): void { | |
143 | for (const [key] of this.idTagsCachesAddressableIndexes) { | |
144 | if (key.startsWith(file)) { | |
145 | this.idTagsCachesAddressableIndexes.delete(key); | |
146 | } | |
147 | } | |
148 | } | |
149 | ||
32e8c8a5 | 150 | private getIdTagsCacheIndexesAddressableKey(prefix: string, uid: string): string { |
7af183e7 JB |
151 | return `${prefix}${uid}`; |
152 | } | |
153 | ||
f911a4af JB |
154 | private getIdTagsFromFile(file: string): string[] { |
155 | let idTags: string[] = []; | |
156 | if (file) { | |
157 | try { | |
158 | // Load id tags file | |
159 | idTags = JSON.parse(fs.readFileSync(file, 'utf8')) as string[]; | |
160 | } catch (error) { | |
51022aa0 | 161 | ErrorUtils.handleFileException( |
f911a4af JB |
162 | file, |
163 | FileType.Authorization, | |
164 | error as NodeJS.ErrnoException, | |
165 | this.logPrefix(file) | |
166 | ); | |
167 | } | |
168 | } else { | |
169 | logger.info(`${this.logPrefix(file)} No id tags file given`); | |
170 | } | |
171 | return idTags; | |
172 | } | |
173 | ||
174 | private logPrefix = (file: string): string => { | |
175 | return Utils.logPrefix(` Id tags cache for id tags file '${file}' |`); | |
176 | }; | |
177 | } |