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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 | ||
7b5dbe91 JB |
30 | /** |
31 | * Get one idtag from the cache given the distribution | |
32 | * Must be called after checking the cache is not an empty array | |
33 | * | |
34 | * @param distribution | |
35 | * @param chargingStation | |
36 | * @param connectorId | |
37 | * @returns | |
38 | */ | |
f911a4af JB |
39 | public getIdTag( |
40 | distribution: IdTagDistribution, | |
41 | chargingStation: ChargingStation, | |
42 | connectorId: number | |
43 | ): string { | |
44 | const hashId = chargingStation.stationInfo.hashId; | |
e302df1d | 45 | const idTagsFile = ChargingStationUtils.getIdTagsFile(chargingStation.stationInfo); |
f911a4af JB |
46 | switch (distribution) { |
47 | case IdTagDistribution.RANDOM: | |
48 | return this.getRandomIdTag(hashId, idTagsFile); | |
49 | case IdTagDistribution.ROUND_ROBIN: | |
50 | return this.getRoundRobinIdTag(hashId, idTagsFile); | |
51 | case IdTagDistribution.CONNECTOR_AFFINITY: | |
52 | return this.getConnectorAffinityIdTag(chargingStation, connectorId); | |
53 | default: | |
54 | return this.getRoundRobinIdTag(hashId, idTagsFile); | |
55 | } | |
56 | } | |
57 | ||
7b5dbe91 JB |
58 | /** |
59 | * Get all idtags from the cache | |
60 | * Must be called after checking the cache is not an empty array | |
61 | * | |
62 | * @param file | |
63 | * @returns | |
64 | */ | |
f911a4af JB |
65 | public getIdTags(file: string): string[] | undefined { |
66 | if (this.hasIdTagsCache(file) === false) { | |
7b5dbe91 JB |
67 | this.setIdTagsCache( |
68 | Utils.isNotEmptyString(file) ? file : 'empty', | |
69 | this.getIdTagsFromFile(file) | |
70 | ); | |
f911a4af JB |
71 | } |
72 | return this.getIdTagsCache(file); | |
73 | } | |
74 | ||
75 | public deleteIdTags(file: string): boolean { | |
76 | return this.deleteIdTagsCache(file); | |
77 | } | |
78 | ||
79 | private getRandomIdTag(hashId: string, file: string): string { | |
80 | const idTags = this.getIdTags(file); | |
32e8c8a5 | 81 | const addressableKey = this.getIdTagsCacheIndexesAddressableKey(file, hashId); |
f911a4af JB |
82 | this.idTagsCachesAddressableIndexes.set( |
83 | addressableKey, | |
84 | Math.floor(Utils.secureRandom() * idTags.length) | |
85 | ); | |
86 | return idTags[this.idTagsCachesAddressableIndexes.get(addressableKey)]; | |
87 | } | |
88 | ||
89 | private getRoundRobinIdTag(hashId: string, file: string): string { | |
90 | const idTags = this.getIdTags(file); | |
32e8c8a5 | 91 | const addressableKey = this.getIdTagsCacheIndexesAddressableKey(file, hashId); |
f911a4af JB |
92 | const idTagIndex = this.idTagsCachesAddressableIndexes.get(addressableKey) ?? 0; |
93 | const idTag = idTags[idTagIndex]; | |
94 | this.idTagsCachesAddressableIndexes.set( | |
95 | addressableKey, | |
96 | idTagIndex === idTags.length - 1 ? 0 : idTagIndex + 1 | |
97 | ); | |
98 | return idTag; | |
99 | } | |
100 | ||
101 | private getConnectorAffinityIdTag(chargingStation: ChargingStation, connectorId: number): string { | |
e302df1d | 102 | const file = ChargingStationUtils.getIdTagsFile(chargingStation.stationInfo); |
f911a4af | 103 | const idTags = this.getIdTags(file); |
728e01f0 JB |
104 | const addressableKey = this.getIdTagsCacheIndexesAddressableKey( |
105 | file, | |
106 | chargingStation.stationInfo.hashId | |
107 | ); | |
f911a4af JB |
108 | this.idTagsCachesAddressableIndexes.set( |
109 | addressableKey, | |
110 | (chargingStation.index - 1 + (connectorId - 1)) % idTags.length | |
111 | ); | |
112 | return idTags[this.idTagsCachesAddressableIndexes.get(addressableKey)]; | |
113 | } | |
114 | ||
115 | private hasIdTagsCache(file: string): boolean { | |
116 | return this.idTagsCaches.has(file); | |
117 | } | |
118 | ||
119 | private setIdTagsCache(file: string, idTags: string[]) { | |
120 | return this.idTagsCaches.set(file, { | |
121 | idTags, | |
122 | idTagsFileWatcher: FileUtils.watchJsonFile( | |
123 | file, | |
124 | FileType.Authorization, | |
125 | this.logPrefix(file), | |
126 | undefined, | |
127 | (event, filename) => { | |
128 | if (Utils.isNotEmptyString(filename) && event === 'change') { | |
129 | try { | |
130 | logger.debug( | |
131 | `${this.logPrefix(file)} ${FileType.Authorization} file have changed, reload` | |
132 | ); | |
133 | this.deleteIdTagsCache(file); | |
134 | this.deleteIdTagsCacheIndexes(file); | |
135 | } catch (error) { | |
51022aa0 | 136 | ErrorUtils.handleFileException( |
f911a4af JB |
137 | file, |
138 | FileType.Authorization, | |
139 | error as NodeJS.ErrnoException, | |
140 | this.logPrefix(file), | |
141 | { | |
142 | throwError: false, | |
143 | } | |
144 | ); | |
145 | } | |
146 | } | |
147 | } | |
148 | ), | |
149 | }); | |
150 | } | |
151 | ||
152 | private getIdTagsCache(file: string): string[] | undefined { | |
153 | return this.idTagsCaches.get(file)?.idTags; | |
154 | } | |
155 | ||
156 | private deleteIdTagsCache(file: string): boolean { | |
157 | this.idTagsCaches.get(file)?.idTagsFileWatcher?.close(); | |
158 | return this.idTagsCaches.delete(file); | |
159 | } | |
160 | ||
161 | private deleteIdTagsCacheIndexes(file: string): void { | |
162 | for (const [key] of this.idTagsCachesAddressableIndexes) { | |
163 | if (key.startsWith(file)) { | |
164 | this.idTagsCachesAddressableIndexes.delete(key); | |
165 | } | |
166 | } | |
167 | } | |
168 | ||
32e8c8a5 | 169 | private getIdTagsCacheIndexesAddressableKey(prefix: string, uid: string): string { |
7af183e7 JB |
170 | return `${prefix}${uid}`; |
171 | } | |
172 | ||
f911a4af | 173 | private getIdTagsFromFile(file: string): string[] { |
7b5dbe91 | 174 | if (Utils.isNotEmptyString(file)) { |
f911a4af | 175 | try { |
7b5dbe91 | 176 | return JSON.parse(fs.readFileSync(file, 'utf8')) as string[]; |
f911a4af | 177 | } catch (error) { |
51022aa0 | 178 | ErrorUtils.handleFileException( |
f911a4af JB |
179 | file, |
180 | FileType.Authorization, | |
181 | error as NodeJS.ErrnoException, | |
182 | this.logPrefix(file) | |
183 | ); | |
184 | } | |
f911a4af | 185 | } |
7b5dbe91 JB |
186 | logger.info(`${this.logPrefix(file)} No id tags file given in configuration`); |
187 | return []; | |
f911a4af JB |
188 | } |
189 | ||
190 | private logPrefix = (file: string): string => { | |
191 | return Utils.logPrefix(` Id tags cache for id tags file '${file}' |`); | |
192 | }; | |
193 | } |