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| 1 | +import type { GenericKvCacheEntry, KeyValueCacheService } from './types.ts' |
| 2 | + |
| 3 | +interface HashEntry { |
| 4 | + key: string |
| 5 | + field: string |
| 6 | + value: any |
| 7 | +} |
| 8 | + |
| 9 | +export class IndexedDBKvCacheService implements KeyValueCacheService { |
| 10 | + readonly #dbName: string |
| 11 | + readonly #storeName: string |
| 12 | + readonly #hashStoreName: string |
| 13 | + |
| 14 | + #db: IDBDatabase | null = null |
| 15 | + #dbInitPromise: Promise<void> | null = null |
| 16 | + |
| 17 | + constructor(dbName: string, storeName: string, hashStoreName: string) { |
| 18 | + this.#dbName = dbName |
| 19 | + this.#storeName = storeName |
| 20 | + this.#hashStoreName = hashStoreName |
| 21 | + this.#db = null |
| 22 | + this.#dbInitPromise = null |
| 23 | + } |
| 24 | + |
| 25 | + async #initDb(): Promise<void> { |
| 26 | + if (this.#db) return |
| 27 | + |
| 28 | + if (this.#dbInitPromise) { |
| 29 | + return this.#dbInitPromise |
| 30 | + } |
| 31 | + |
| 32 | + this.#dbInitPromise = new Promise((resolve, reject) => { |
| 33 | + let request = indexedDB.open(this.#dbName, 1) |
| 34 | + |
| 35 | + request.onerror = () => reject(request.error) |
| 36 | + |
| 37 | + request.onupgradeneeded = (event) => { |
| 38 | + let db = (event.target as IDBOpenDBRequest).result |
| 39 | + |
| 40 | + // Create store for regular key-value pairs |
| 41 | + if (!db.objectStoreNames.contains(this.#storeName)) { |
| 42 | + db.createObjectStore(this.#storeName, { keyPath: 'key' }) |
| 43 | + } |
| 44 | + |
| 45 | + // Create store for hash fields |
| 46 | + if (!db.objectStoreNames.contains(this.#hashStoreName)) { |
| 47 | + let hashStore = db.createObjectStore(this.#hashStoreName, { keyPath: ['key', 'field'] }) |
| 48 | + hashStore.createIndex('key_index', 'key') |
| 49 | + } |
| 50 | + } |
| 51 | + |
| 52 | + request.onsuccess = () => { |
| 53 | + this.#db = request.result |
| 54 | + resolve() |
| 55 | + } |
| 56 | + }) |
| 57 | + |
| 58 | + return this.#dbInitPromise |
| 59 | + } |
| 60 | + |
| 61 | + #getStore(storeName: string, mode: IDBTransactionMode = 'readonly'): IDBObjectStore { |
| 62 | + if (!this.#db) throw new Error('Database not initialized') |
| 63 | + let transaction = this.#db.transaction(storeName, mode) |
| 64 | + return transaction.objectStore(storeName) |
| 65 | + } |
| 66 | + |
| 67 | + async has(key: string): Promise<boolean> { |
| 68 | + await this.#initDb() |
| 69 | + return new Promise((resolve, reject) => { |
| 70 | + let store = this.#getStore(this.#storeName) |
| 71 | + let request = store.get(key) |
| 72 | + |
| 73 | + request.onerror = () => reject(request.error) |
| 74 | + request.onsuccess = () => { |
| 75 | + let entry = request.result as GenericKvCacheEntry | undefined |
| 76 | + if (!entry) { |
| 77 | + resolve(false) |
| 78 | + return |
| 79 | + } |
| 80 | + |
| 81 | + if (entry.expiresAt && entry.expiresAt < Date.now()) { |
| 82 | + resolve(false) |
| 83 | + return |
| 84 | + } |
| 85 | + |
| 86 | + resolve(true) |
| 87 | + } |
| 88 | + }) |
| 89 | + } |
| 90 | + |
| 91 | + async get<T = any>(key: string): Promise<T | null> { |
| 92 | + await this.#initDb() |
| 93 | + return new Promise((resolve, reject) => { |
| 94 | + let store = this.#getStore(this.#storeName) |
| 95 | + let request = store.get(key) |
| 96 | + |
| 97 | + request.onerror = () => reject(request.error) |
| 98 | + request.onsuccess = () => { |
| 99 | + let entry = request.result as GenericKvCacheEntry | undefined |
| 100 | + if (!entry) { |
| 101 | + resolve(null) |
| 102 | + return |
| 103 | + } |
| 104 | + |
| 105 | + if (entry.expiresAt && entry.expiresAt < Date.now()) { |
| 106 | + resolve(null) |
| 107 | + return |
| 108 | + } |
| 109 | + |
| 110 | + resolve(entry.value) |
| 111 | + } |
| 112 | + }) |
| 113 | + } |
| 114 | + |
| 115 | + async hashGet<T = string>(key: string, field: string): Promise<T | null> { |
| 116 | + await this.#initDb() |
| 117 | + return new Promise((resolve, reject) => { |
| 118 | + let store = this.#getStore(this.#hashStoreName) |
| 119 | + let request = store.get([key, field]) |
| 120 | + |
| 121 | + request.onerror = () => reject(request.error) |
| 122 | + request.onsuccess = () => { |
| 123 | + let entry = request.result as HashEntry | undefined |
| 124 | + resolve(entry?.value ?? null) |
| 125 | + } |
| 126 | + }) |
| 127 | + } |
| 128 | + |
| 129 | + async getObject<T = any>(key: string): Promise<T | null> { |
| 130 | + let value = await this.get<T>(key) |
| 131 | + if (!value) return null |
| 132 | + try { |
| 133 | + return value |
| 134 | + } catch { |
| 135 | + return null |
| 136 | + } |
| 137 | + } |
| 138 | + |
| 139 | + async set<T = any>(key: string, value: T, expirationSeconds: number): Promise<void> { |
| 140 | + await this.#initDb() |
| 141 | + return new Promise((resolve, reject) => { |
| 142 | + let store = this.#getStore(this.#storeName, 'readwrite') |
| 143 | + let expiresAt = expirationSeconds > 0 ? Date.now() + expirationSeconds * 1000 : null |
| 144 | + let request = store.put({ key, value, expiresAt } satisfies GenericKvCacheEntry & { key: string }) |
| 145 | + |
| 146 | + request.onerror = () => reject(request.error) |
| 147 | + request.onsuccess = () => resolve() |
| 148 | + }) |
| 149 | + } |
| 150 | + |
| 151 | + async setObject<T = any>(key: string, value: T, expirationSeconds: number): Promise<void> { |
| 152 | + return this.set(key, value, expirationSeconds) |
| 153 | + } |
| 154 | + |
| 155 | + async hashSet(key: string, field: string, value: string | undefined): Promise<void> { |
| 156 | + await this.#initDb() |
| 157 | + return new Promise((resolve, reject) => { |
| 158 | + let store = this.#getStore(this.#hashStoreName, 'readwrite') |
| 159 | + |
| 160 | + if (value === undefined) { |
| 161 | + let request = store.delete([key, field]) |
| 162 | + request.onerror = () => reject(request.error) |
| 163 | + request.onsuccess = () => resolve() |
| 164 | + } else { |
| 165 | + let request = store.put({ key, field, value } satisfies HashEntry) |
| 166 | + request.onerror = () => reject(request.error) |
| 167 | + request.onsuccess = () => resolve() |
| 168 | + } |
| 169 | + }) |
| 170 | + } |
| 171 | + |
| 172 | + async delete(...keys: string[]): Promise<number> { |
| 173 | + await this.#initDb() |
| 174 | + return new Promise((resolve, reject) => { |
| 175 | + let store = this.#getStore(this.#storeName, 'readwrite') |
| 176 | + let deletedCount = 0 |
| 177 | + let completedCount = 0 |
| 178 | + |
| 179 | + let checkCompletion = () => { |
| 180 | + if (completedCount === keys.length) { |
| 181 | + resolve(deletedCount) |
| 182 | + } |
| 183 | + } |
| 184 | + |
| 185 | + keys.forEach((key) => { |
| 186 | + let request = store.delete(key) |
| 187 | + request.onerror = () => reject(request.error) |
| 188 | + request.onsuccess = () => { |
| 189 | + deletedCount++ |
| 190 | + completedCount++ |
| 191 | + checkCompletion() |
| 192 | + } |
| 193 | + }) |
| 194 | + |
| 195 | + // Handle empty keys array |
| 196 | + if (keys.length === 0) { |
| 197 | + resolve(0) |
| 198 | + } |
| 199 | + }) |
| 200 | + } |
| 201 | + |
| 202 | + async keys(): Promise<string[]> { |
| 203 | + await this.#initDb() |
| 204 | + return new Promise((resolve, reject) => { |
| 205 | + let store = this.#getStore(this.#storeName) |
| 206 | + let request = store.getAll() |
| 207 | + request.onerror = () => reject(request.error) |
| 208 | + request.onsuccess = () => resolve(request.result.map((entry) => entry.key)) |
| 209 | + }) |
| 210 | + } |
| 211 | + |
| 212 | + async size(): Promise<number> { |
| 213 | + await this.#initDb() |
| 214 | + return new Promise((resolve, reject) => { |
| 215 | + let store = this.#getStore(this.#storeName) |
| 216 | + let request = store.count() |
| 217 | + request.onerror = () => reject(request.error) |
| 218 | + request.onsuccess = () => resolve(request.result) |
| 219 | + }) |
| 220 | + } |
| 221 | +} |
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