| 1 | import { app, BrowserWindow, type WebContents } from 'electron' |
| 2 | import { is } from '@electron-toolkit/utils' |
| 3 | import { createHash } from 'node:crypto' |
| 4 | import fs from 'node:fs' |
| 5 | import path from 'node:path' |
| 6 | import { pathToFileURL } from 'node:url' |
| 7 | import pLimit from 'p-limit' |
| 8 | import type { PPTDatabase, ThumbnailRecord } from '../../db/database' |
| 9 | import type { HtmlThumbnailResourceType } from '@shared/thumbnail' |
| 10 | import { allowLocalAssetRoot } from '../local-asset-roots' |
| 11 | import { FREEZE_PAGE_FOR_EXPORT_SCRIPT } from '../html-pptx/browser-scripts' |
| 12 | |
| 13 | const DEFAULT_CAPTURE_WIDTH = 1600 |
| 14 | const DEFAULT_CAPTURE_HEIGHT = 900 |
| 15 | const DEFAULT_THUMBNAIL_WIDTH = 640 |
| 16 | const DEFAULT_THUMBNAIL_HEIGHT = 360 |
| 17 | export const HTML_THUMBNAIL_CONCURRENCY = 2 |
| 18 | const PRINT_READY_PREFIX = '__PPT_PRINT_READY__' |
| 19 | const PRINT_READY_DEFAULT_TIMEOUT_MS = 8000 |
| 20 | const PRINT_READY_SETTLE_MS = 120 |
| 21 | const PRINT_READY_PASS_TWO_DELAY_MS = 450 |
| 22 | const PRINT_READY_PASS_THREE_DELAY_MS = 80 |
| 23 | const MAX_SOURCE_STABILITY_ATTEMPTS = 2 |
| 24 | |
| 25 | export type HtmlThumbnailRequest = { |
| 26 | resourceType: HtmlThumbnailResourceType |
| 27 | resourceId: string |
| 28 | variant?: string |
| 29 | sourcePath: string |
| 30 | pageId?: string |
| 31 | query?: Record<string, string> |
| 32 | captureWidth?: number |
| 33 | captureHeight?: number |
| 34 | thumbnailWidth?: number |
| 35 | thumbnailHeight?: number |
| 36 | } |
| 37 | |
| 38 | export type HtmlThumbnailTaskStatus = 'queued' | 'running' | 'completed' | 'failed' |
| 39 | |
| 40 | export type HtmlThumbnailTask = { |
| 41 | resourceType: HtmlThumbnailResourceType |
| 42 | resourceId: string |
| 43 | variant: string |
| 44 | status: HtmlThumbnailTaskStatus |
| 45 | thumbnailPath: string | null |
| 46 | error?: string |
| 47 | } |
| 48 | |
| 49 | export type HtmlPageScreenshotRequest = { |
| 50 | sourcePath: string |
| 51 | pageId: string |
| 52 | width: number |
| 53 | height: number |
| 54 | } |
| 55 | |
| 56 | let thumbnailDb: PPTDatabase | null = null |
| 57 | const thumbnailLimit = pLimit(HTML_THUMBNAIL_CONCURRENCY) |
| 58 | const backgroundTasks = new Map<string, HtmlThumbnailTask>() |
| 59 | const taskListeners = new Set<(task: HtmlThumbnailTask) => void>() |
| 60 | |
| 61 | export function configureHtmlThumbnailService(db: PPTDatabase): void { |
| 62 | thumbnailDb = db |
| 63 | const cacheRoot = resolveHtmlThumbnailCacheRoot() |
| 64 | fs.mkdirSync(cacheRoot, { recursive: true }) |
| 65 | for (const entry of fs.readdirSync(cacheRoot, { withFileTypes: true })) { |
| 66 | if (entry.isFile() && entry.name.endsWith('.tmp')) { |
| 67 | try { |
| 68 | fs.rmSync(path.join(cacheRoot, entry.name), { force: true }) |
| 69 | } catch { |
| 70 | // A stale temp file must not prevent the app from starting. |
| 71 | } |
| 72 | } |
| 73 | } |
| 74 | allowLocalAssetRoot(cacheRoot) |
| 75 | } |
| 76 | |
| 77 | export function onHtmlThumbnailTaskChanged( |
| 78 | listener: (task: HtmlThumbnailTask) => void |
| 79 | ): () => void { |
| 80 | taskListeners.add(listener) |
| 81 | return () => taskListeners.delete(listener) |
| 82 | } |
| 83 | |
| 84 | function emitTaskChanged(task: HtmlThumbnailTask): void { |
| 85 | for (const listener of taskListeners) listener({ ...task }) |
| 86 | } |
| 87 | |
| 88 | function getDb(): PPTDatabase { |
| 89 | if (!thumbnailDb) throw new Error('Thumbnail service is not initialized') |
| 90 | return thumbnailDb |
| 91 | } |
| 92 | |
| 93 | function thumbnailTaskKey( |
| 94 | resourceType: HtmlThumbnailResourceType, |
| 95 | resourceId: string, |
| 96 | variant: string |
| 97 | ): string { |
| 98 | return `${resourceType}\u0000${resourceId}\u0000${variant}` |
| 99 | } |
| 100 | |
| 101 | function normalizeDimension(value: number | undefined, fallback: number): number { |
| 102 | return typeof value === 'number' && Number.isFinite(value) |
| 103 | ? Math.max(64, Math.min(4096, Math.round(value))) |
| 104 | : fallback |
| 105 | } |
| 106 | |
| 107 | function normalizeRequest(request: HtmlThumbnailRequest): Required<HtmlThumbnailRequest> { |
| 108 | const query = Object.fromEntries( |
| 109 | Object.entries(request.query || {}) |
| 110 | .map(([key, value]) => [String(key), String(value)] as const) |
| 111 | .sort(([left], [right]) => left.localeCompare(right)) |
| 112 | ) |
| 113 | return { |
| 114 | resourceType: request.resourceType, |
| 115 | resourceId: String(request.resourceId || '').trim(), |
| 116 | variant: String(request.variant || 'default').trim() || 'default', |
| 117 | sourcePath: path.resolve(request.sourcePath), |
| 118 | pageId: String(request.pageId || '').trim(), |
| 119 | query, |
| 120 | captureWidth: normalizeDimension(request.captureWidth, DEFAULT_CAPTURE_WIDTH), |
| 121 | captureHeight: normalizeDimension(request.captureHeight, DEFAULT_CAPTURE_HEIGHT), |
| 122 | thumbnailWidth: normalizeDimension(request.thumbnailWidth, DEFAULT_THUMBNAIL_WIDTH), |
| 123 | thumbnailHeight: normalizeDimension(request.thumbnailHeight, DEFAULT_THUMBNAIL_HEIGHT) |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | function validateRequest(request: Required<HtmlThumbnailRequest>): void { |
| 128 | if (!request.resourceType) throw new Error('Thumbnail resourceType is required') |
| 129 | if (!request.resourceId) throw new Error('Thumbnail resourceId is required') |
| 130 | } |
| 131 | |
| 132 | function requestSignature(request: Required<HtmlThumbnailRequest>): string { |
| 133 | return JSON.stringify(request) |
| 134 | } |
| 135 | |
| 136 | export function resolveHtmlThumbnailCacheRoot(): string { |
| 137 | return path.join(app.getPath('userData'), is.dev ? 'html-thumbnails-dev' : 'html-thumbnails') |
| 138 | } |
| 139 | |
| 140 | export function resolveHtmlThumbnailPath( |
| 141 | resourceType: HtmlThumbnailResourceType, |
| 142 | resourceId: string, |
| 143 | variant = 'default', |
| 144 | size?: { width: number; height: number } |
| 145 | ): string { |
| 146 | const key = createHash('sha256') |
| 147 | .update( |
| 148 | JSON.stringify({ |
| 149 | resourceType, |
| 150 | resourceId, |
| 151 | variant, |
| 152 | width: size?.width || DEFAULT_CAPTURE_WIDTH, |
| 153 | height: size?.height || DEFAULT_CAPTURE_HEIGHT |
| 154 | }) |
| 155 | ) |
| 156 | .digest('hex') |
| 157 | .slice(0, 32) |
| 158 | return path.join(resolveHtmlThumbnailCacheRoot(), `${key}.png`) |
| 159 | } |
| 160 | |
| 161 | function recordToTask(record: ThumbnailRecord | undefined): HtmlThumbnailTask | null { |
| 162 | if (!record) return null |
| 163 | return { |
| 164 | resourceType: record.resourceType, |
| 165 | resourceId: record.resourceId, |
| 166 | variant: record.variant, |
| 167 | status: record.status, |
| 168 | thumbnailPath: |
| 169 | record.status === 'completed' && record.thumbnailPath && fs.existsSync(record.thumbnailPath) |
| 170 | ? record.thumbnailPath |
| 171 | : null, |
| 172 | error: record.error || undefined |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | export async function getHtmlThumbnailTask( |
| 177 | resourceType: HtmlThumbnailResourceType, |
| 178 | resourceId: string, |
| 179 | variant = 'default' |
| 180 | ): Promise<HtmlThumbnailTask | null> { |
| 181 | const normalizedVariant = variant.trim() || 'default' |
| 182 | const key = thumbnailTaskKey(resourceType, resourceId, normalizedVariant) |
| 183 | const activeTask = backgroundTasks.get(key) |
| 184 | if (activeTask) return { ...activeTask } |
| 185 | const record = await getDb().getThumbnailRecord(resourceType, resourceId, normalizedVariant) |
| 186 | return recordToTask(record) |
| 187 | } |
| 188 | |
| 189 | export async function waitForHtmlThumbnailTask( |
| 190 | resourceType: HtmlThumbnailResourceType, |
| 191 | resourceId: string, |
| 192 | variant = 'default', |
| 193 | timeoutMs = 60_000 |
| 194 | ): Promise<HtmlThumbnailTask> { |
| 195 | const normalizedVariant = variant.trim() || 'default' |
| 196 | return new Promise((resolve, reject) => { |
| 197 | let finished = false |
| 198 | let timeoutRef: NodeJS.Timeout | null = null |
| 199 | |
| 200 | const finish = (task: HtmlThumbnailTask): void => { |
| 201 | if (finished) return |
| 202 | finished = true |
| 203 | if (timeoutRef) clearTimeout(timeoutRef) |
| 204 | unsubscribe() |
| 205 | if (task.status === 'completed' && task.thumbnailPath) { |
| 206 | resolve(task) |
| 207 | return |
| 208 | } |
| 209 | reject(new Error(task.error || 'Thumbnail generation failed')) |
| 210 | } |
| 211 | |
| 212 | const unsubscribe = onHtmlThumbnailTaskChanged((task) => { |
| 213 | if ( |
| 214 | task.resourceType !== resourceType || |
| 215 | task.resourceId !== resourceId || |
| 216 | task.variant !== normalizedVariant || |
| 217 | (task.status !== 'completed' && task.status !== 'failed') |
| 218 | ) { |
| 219 | return |
| 220 | } |
| 221 | finish(task) |
| 222 | }) |
| 223 | |
| 224 | timeoutRef = setTimeout( |
| 225 | () => { |
| 226 | finish({ |
| 227 | resourceType, |
| 228 | resourceId, |
| 229 | variant: normalizedVariant, |
| 230 | status: 'failed', |
| 231 | thumbnailPath: null, |
| 232 | error: 'Thumbnail generation timed out' |
| 233 | }) |
| 234 | }, |
| 235 | Math.max(1_000, timeoutMs) |
| 236 | ) |
| 237 | |
| 238 | void getHtmlThumbnailTask(resourceType, resourceId, normalizedVariant) |
| 239 | .then((task) => { |
| 240 | if (task && (task.status === 'completed' || task.status === 'failed')) finish(task) |
| 241 | }) |
| 242 | .catch((error) => { |
| 243 | finish({ |
| 244 | resourceType, |
| 245 | resourceId, |
| 246 | variant: normalizedVariant, |
| 247 | status: 'failed', |
| 248 | thumbnailPath: null, |
| 249 | error: error instanceof Error ? error.message : String(error) |
| 250 | }) |
| 251 | }) |
| 252 | }) |
| 253 | } |
| 254 | |
| 255 | export async function getFreshHtmlThumbnailPath( |
| 256 | request: HtmlThumbnailRequest |
| 257 | ): Promise<string | null> { |
| 258 | const normalized = normalizeRequest(request) |
| 259 | validateRequest(normalized) |
| 260 | if (!fs.existsSync(normalized.sourcePath)) return null |
| 261 | const record = await getDb().getThumbnailRecord( |
| 262 | normalized.resourceType, |
| 263 | normalized.resourceId, |
| 264 | normalized.variant |
| 265 | ) |
| 266 | if (!record || record.status !== 'completed' || !fs.existsSync(record.thumbnailPath)) return null |
| 267 | |
| 268 | try { |
| 269 | const sourceMtimeMs = Math.floor(fs.statSync(normalized.sourcePath).mtimeMs) |
| 270 | return record.signature === requestSignature(normalized) && |
| 271 | record.sourceMtimeMs >= sourceMtimeMs |
| 272 | ? record.thumbnailPath |
| 273 | : null |
| 274 | } catch { |
| 275 | return null |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | export async function getFreshHtmlThumbnailPaths( |
| 280 | requests: HtmlThumbnailRequest[] |
| 281 | ): Promise<Map<string, string>> { |
| 282 | const result = new Map<string, string>() |
| 283 | if (requests.length === 0) return result |
| 284 | |
| 285 | const validRaw = requests.filter((request) => { |
| 286 | const resourceType = String(request.resourceType || '').trim() |
| 287 | const resourceId = String(request.resourceId || '').trim() |
| 288 | const sourcePath = typeof request.sourcePath === 'string' ? request.sourcePath.trim() : '' |
| 289 | return resourceType.length > 0 && resourceId.length > 0 && sourcePath.length > 0 |
| 290 | }) |
| 291 | if (validRaw.length === 0) return result |
| 292 | |
| 293 | const normalized = validRaw.map((request) => { |
| 294 | const item = normalizeRequest(request) |
| 295 | return { request: item, sourceExists: fs.existsSync(item.sourcePath) } |
| 296 | }) |
| 297 | |
| 298 | const groups = new Map<string, Required<HtmlThumbnailRequest>[]>() |
| 299 | for (const entry of normalized) { |
| 300 | if (!entry.sourceExists) continue |
| 301 | const groupKey = `${entry.request.resourceType}\u0000${entry.request.variant}` |
| 302 | const arr = groups.get(groupKey) || [] |
| 303 | arr.push(entry.request) |
| 304 | groups.set(groupKey, arr) |
| 305 | } |
| 306 | |
| 307 | const db = getDb() |
| 308 | for (const arr of groups.values()) { |
| 309 | const resourceType = arr[0].resourceType |
| 310 | const variant = arr[0].variant |
| 311 | const records = await db.getThumbnailRecords( |
| 312 | resourceType, |
| 313 | arr.map((item) => item.resourceId), |
| 314 | variant |
| 315 | ) |
| 316 | const recordByResourceId = new Map(records.map((record) => [record.resourceId, record])) |
| 317 | for (const request of arr) { |
| 318 | const record = recordByResourceId.get(request.resourceId) |
| 319 | if (!record || record.status !== 'completed') continue |
| 320 | if (!record.thumbnailPath || !fs.existsSync(record.thumbnailPath)) continue |
| 321 | try { |
| 322 | const sourceMtimeMs = Math.floor(fs.statSync(request.sourcePath).mtimeMs) |
| 323 | if ( |
| 324 | record.signature === requestSignature(request) && |
| 325 | record.sourceMtimeMs >= sourceMtimeMs |
| 326 | ) { |
| 327 | result.set(request.resourceId, record.thumbnailPath) |
| 328 | } |
| 329 | } catch { |
| 330 | // Skip entries whose source can no longer be stat'd. |
| 331 | } |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | return result |
| 336 | } |
| 337 | |
| 338 | async function ensureThumbnailCacheRoot(): Promise<void> { |
| 339 | const cacheRoot = resolveHtmlThumbnailCacheRoot() |
| 340 | await fs.promises.mkdir(cacheRoot, { recursive: true }) |
| 341 | allowLocalAssetRoot(cacheRoot) |
| 342 | } |
| 343 | |
| 344 | function createCaptureWindow(): BrowserWindow { |
| 345 | return new BrowserWindow({ |
| 346 | show: false, |
| 347 | width: DEFAULT_CAPTURE_WIDTH, |
| 348 | height: DEFAULT_CAPTURE_HEIGHT, |
| 349 | backgroundColor: '#ffffff', |
| 350 | webPreferences: { |
| 351 | contextIsolation: true, |
| 352 | sandbox: false, |
| 353 | nodeIntegration: false, |
| 354 | backgroundThrottling: false, |
| 355 | offscreen: false |
| 356 | } |
| 357 | }) |
| 358 | } |
| 359 | |
| 360 | const sleep = (ms: number): Promise<void> => new Promise((resolve) => setTimeout(resolve, ms)) |
| 361 | |
| 362 | function waitForPrintReady( |
| 363 | webContents: WebContents, |
| 364 | pageId: string, |
| 365 | timeoutMs: number |
| 366 | ): Promise<{ timedOut: boolean; reportedPageId?: string }> { |
| 367 | return new Promise((resolve) => { |
| 368 | let done = false |
| 369 | let timeoutRef: NodeJS.Timeout | null = null |
| 370 | |
| 371 | const finalize = (timedOut: boolean, reportedPageId?: string): void => { |
| 372 | if (done) return |
| 373 | done = true |
| 374 | if (timeoutRef) clearTimeout(timeoutRef) |
| 375 | webContents.removeListener('console-message', onConsoleMessage) |
| 376 | resolve({ timedOut, reportedPageId }) |
| 377 | } |
| 378 | |
| 379 | const onConsoleMessage = (...rawArgs: unknown[]): void => { |
| 380 | const message = |
| 381 | rawArgs.length >= 3 && typeof rawArgs[2] === 'string' |
| 382 | ? rawArgs[2] |
| 383 | : ((rawArgs[0] as { message?: unknown } | undefined)?.message ?? '') |
| 384 | if (typeof message !== 'string') return |
| 385 | const prefixIndex = message.indexOf(PRINT_READY_PREFIX) |
| 386 | if (prefixIndex < 0) return |
| 387 | const suffix = message.slice(prefixIndex + PRINT_READY_PREFIX.length) |
| 388 | const colonIndex = suffix.indexOf(':') |
| 389 | const reported = colonIndex >= 0 ? suffix.slice(colonIndex + 1).trim() : '' |
| 390 | if (reported === pageId || reported === 'page-unknown') { |
| 391 | finalize(false, reported) |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | timeoutRef = setTimeout(() => finalize(true), Math.max(500, timeoutMs)) |
| 396 | webContents.on('console-message', onConsoleMessage as (...args: unknown[]) => void) |
| 397 | }) |
| 398 | } |
| 399 | |
| 400 | async function captureThumbnail( |
| 401 | window: BrowserWindow, |
| 402 | request: Required<HtmlThumbnailRequest> |
| 403 | ): Promise<Buffer> { |
| 404 | window.webContents.setZoomFactor(1) |
| 405 | window.setContentSize(request.captureWidth, request.captureHeight) |
| 406 | |
| 407 | if (request.pageId) { |
| 408 | // Export strategy: drive the page in print/export mode so the runtime |
| 409 | // emits PRINT_READY, then run FREEZE in three passes mirroring the |
| 410 | // renderPageToPdfBuffer flow used by PNG/PDF/PPTX export. |
| 411 | const pageUrl = new URL(pathToFileURL(request.sourcePath).toString()) |
| 412 | pageUrl.searchParams.set('fit', 'off') |
| 413 | pageUrl.searchParams.set('print', '1') |
| 414 | pageUrl.searchParams.set('export', '1') |
| 415 | pageUrl.searchParams.set('pageId', request.pageId) |
| 416 | pageUrl.searchParams.set('printTimeoutMs', String(PRINT_READY_DEFAULT_TIMEOUT_MS)) |
| 417 | pageUrl.searchParams.set('_ts', String(Date.now())) |
| 418 | for (const [key, value] of Object.entries(request.query)) { |
| 419 | pageUrl.searchParams.set(key, value) |
| 420 | } |
| 421 | pageUrl.searchParams.set( |
| 422 | '_pptMasterExpected', |
| 423 | fs.existsSync(path.join(path.dirname(request.sourcePath), 'master', 'master.css')) ? '1' : '0' |
| 424 | ) |
| 425 | pageUrl.searchParams.set( |
| 426 | '_pptMasterElementsExpected', |
| 427 | fs.existsSync(path.join(path.dirname(request.sourcePath), 'master', 'master.html')) |
| 428 | ? '1' |
| 429 | : '0' |
| 430 | ) |
| 431 | |
| 432 | const readyWaitPromise = waitForPrintReady( |
| 433 | window.webContents, |
| 434 | request.pageId, |
| 435 | PRINT_READY_DEFAULT_TIMEOUT_MS |
| 436 | ) |
| 437 | await window.loadURL(pageUrl.toString()) |
| 438 | await window.webContents.executeJavaScript(FREEZE_PAGE_FOR_EXPORT_SCRIPT, true) |
| 439 | await readyWaitPromise |
| 440 | await sleep(PRINT_READY_SETTLE_MS) |
| 441 | await window.webContents.executeJavaScript(FREEZE_PAGE_FOR_EXPORT_SCRIPT, true) |
| 442 | await sleep(PRINT_READY_PASS_TWO_DELAY_MS) |
| 443 | await window.webContents.executeJavaScript(FREEZE_PAGE_FOR_EXPORT_SCRIPT, true) |
| 444 | await sleep(PRINT_READY_PASS_THREE_DELAY_MS) |
| 445 | } else { |
| 446 | await window.loadFile(request.sourcePath, { |
| 447 | query: { |
| 448 | ...request.query, |
| 449 | _pptMasterExpected: fs.existsSync( |
| 450 | path.join(path.dirname(request.sourcePath), 'master', 'master.css') |
| 451 | ) |
| 452 | ? '1' |
| 453 | : '0', |
| 454 | _pptMasterElementsExpected: fs.existsSync( |
| 455 | path.join(path.dirname(request.sourcePath), 'master', 'master.html') |
| 456 | ) |
| 457 | ? '1' |
| 458 | : '0' |
| 459 | } |
| 460 | }) |
| 461 | await window.webContents.executeJavaScript(FREEZE_PAGE_FOR_EXPORT_SCRIPT, true) |
| 462 | await window.webContents.executeJavaScript( |
| 463 | `new Promise((resolve) => requestAnimationFrame(() => requestAnimationFrame(resolve)))` |
| 464 | ) |
| 465 | } |
| 466 | |
| 467 | const image = await window.webContents.capturePage({ |
| 468 | x: 0, |
| 469 | y: 0, |
| 470 | width: request.captureWidth, |
| 471 | height: request.captureHeight |
| 472 | }) |
| 473 | return image |
| 474 | .resize({ |
| 475 | width: request.thumbnailWidth, |
| 476 | height: request.thumbnailHeight, |
| 477 | quality: 'best' |
| 478 | }) |
| 479 | .toPNG() |
| 480 | } |
| 481 | |
| 482 | /** Captures one persisted page at its logical canvas size without creating a thumbnail record. */ |
| 483 | export async function captureHtmlPageScreenshot(args: HtmlPageScreenshotRequest): Promise<Buffer> { |
| 484 | const sourcePath = path.resolve(args.sourcePath) |
| 485 | const pageId = String(args.pageId || '').trim() |
| 486 | if (!pageId) throw new Error('Page screenshot requires a page id') |
| 487 | if (!fs.existsSync(sourcePath)) throw new Error('Page screenshot source does not exist') |
| 488 | |
| 489 | const request = normalizeRequest({ |
| 490 | resourceType: 'session', |
| 491 | resourceId: 'temporary-page-screenshot', |
| 492 | variant: 'temporary', |
| 493 | sourcePath, |
| 494 | pageId, |
| 495 | captureWidth: args.width, |
| 496 | captureHeight: args.height, |
| 497 | thumbnailWidth: args.width, |
| 498 | thumbnailHeight: args.height |
| 499 | }) |
| 500 | |
| 501 | return thumbnailLimit(async () => { |
| 502 | const window = createCaptureWindow() |
| 503 | try { |
| 504 | return await captureThumbnail(window, request) |
| 505 | } finally { |
| 506 | if (!window.isDestroyed()) window.destroy() |
| 507 | } |
| 508 | }) |
| 509 | } |
| 510 | |
| 511 | async function persistTask( |
| 512 | request: Required<HtmlThumbnailRequest>, |
| 513 | status: HtmlThumbnailTaskStatus, |
| 514 | thumbnailPath: string, |
| 515 | error?: string, |
| 516 | sourceMtimeMsOverride?: number |
| 517 | ): Promise<void> { |
| 518 | const sourceMtimeMs = |
| 519 | sourceMtimeMsOverride ?? |
| 520 | (fs.existsSync(request.sourcePath) |
| 521 | ? Math.floor((await fs.promises.stat(request.sourcePath)).mtimeMs) |
| 522 | : 0) |
| 523 | await getDb().upsertThumbnailRecord({ |
| 524 | resourceType: request.resourceType, |
| 525 | resourceId: request.resourceId, |
| 526 | variant: request.variant, |
| 527 | sourcePath: request.sourcePath, |
| 528 | sourceMtimeMs, |
| 529 | signature: requestSignature(request), |
| 530 | thumbnailPath, |
| 531 | status, |
| 532 | error: error || null |
| 533 | }) |
| 534 | } |
| 535 | |
| 536 | export async function enqueueHtmlThumbnail( |
| 537 | request: HtmlThumbnailRequest, |
| 538 | options: { force?: boolean; delayMs?: number } = {} |
| 539 | ): Promise<HtmlThumbnailTask> { |
| 540 | const normalized = normalizeRequest(request) |
| 541 | validateRequest(normalized) |
| 542 | const key = thumbnailTaskKey(normalized.resourceType, normalized.resourceId, normalized.variant) |
| 543 | const existing = backgroundTasks.get(key) |
| 544 | if (existing?.status === 'queued' || existing?.status === 'running') return { ...existing } |
| 545 | |
| 546 | if (!options.force) { |
| 547 | const thumbnailPath = await getFreshHtmlThumbnailPath(normalized) |
| 548 | if (thumbnailPath) { |
| 549 | const completed: HtmlThumbnailTask = { |
| 550 | resourceType: normalized.resourceType, |
| 551 | resourceId: normalized.resourceId, |
| 552 | variant: normalized.variant, |
| 553 | status: 'completed', |
| 554 | thumbnailPath |
| 555 | } |
| 556 | return { ...completed } |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | const queued: HtmlThumbnailTask = { |
| 561 | resourceType: normalized.resourceType, |
| 562 | resourceId: normalized.resourceId, |
| 563 | variant: normalized.variant, |
| 564 | status: 'queued', |
| 565 | thumbnailPath: null |
| 566 | } |
| 567 | backgroundTasks.set(key, queued) |
| 568 | await persistTask(normalized, 'queued', queued.thumbnailPath || '') |
| 569 | emitTaskChanged(queued) |
| 570 | |
| 571 | const readyAt = Date.now() + Math.max(0, options.delayMs || 0) |
| 572 | void thumbnailLimit(async () => { |
| 573 | const remainingDelayMs = readyAt - Date.now() |
| 574 | if (remainingDelayMs > 0) { |
| 575 | await new Promise((resolve) => setTimeout(resolve, remainingDelayMs)) |
| 576 | } |
| 577 | let pendingPath = '' |
| 578 | try { |
| 579 | const running = { ...queued, status: 'running' as const } |
| 580 | backgroundTasks.set(key, running) |
| 581 | await persistTask(normalized, 'running', '') |
| 582 | emitTaskChanged(running) |
| 583 | await ensureThumbnailCacheRoot() |
| 584 | const thumbnailPath = resolveHtmlThumbnailPath( |
| 585 | normalized.resourceType, |
| 586 | normalized.resourceId, |
| 587 | normalized.variant, |
| 588 | { width: normalized.captureWidth, height: normalized.captureHeight } |
| 589 | ) |
| 590 | pendingPath = `${thumbnailPath}.tmp` |
| 591 | let png: Buffer | null = null |
| 592 | let capturedSourceMtimeMs = 0 |
| 593 | for (let attempt = 0; attempt < MAX_SOURCE_STABILITY_ATTEMPTS; attempt += 1) { |
| 594 | const sourceMtimeBefore = Math.floor( |
| 595 | (await fs.promises.stat(normalized.sourcePath)).mtimeMs |
| 596 | ) |
| 597 | const window = createCaptureWindow() |
| 598 | try { |
| 599 | png = await captureThumbnail(window, normalized) |
| 600 | } finally { |
| 601 | if (!window.isDestroyed()) window.destroy() |
| 602 | } |
| 603 | const sourceMtimeAfter = Math.floor((await fs.promises.stat(normalized.sourcePath)).mtimeMs) |
| 604 | if (sourceMtimeBefore === sourceMtimeAfter) { |
| 605 | capturedSourceMtimeMs = sourceMtimeAfter |
| 606 | break |
| 607 | } |
| 608 | png = null |
| 609 | } |
| 610 | if (!png) throw new Error('Thumbnail source changed during capture') |
| 611 | await fs.promises.writeFile(pendingPath, png) |
| 612 | await fs.promises.rename(pendingPath, thumbnailPath) |
| 613 | const completed: HtmlThumbnailTask = { |
| 614 | resourceType: normalized.resourceType, |
| 615 | resourceId: normalized.resourceId, |
| 616 | variant: normalized.variant, |
| 617 | status: 'completed', |
| 618 | thumbnailPath |
| 619 | } |
| 620 | await persistTask(normalized, 'completed', thumbnailPath, undefined, capturedSourceMtimeMs) |
| 621 | emitTaskChanged(completed) |
| 622 | backgroundTasks.delete(key) |
| 623 | } catch (error) { |
| 624 | if (pendingPath) await fs.promises.rm(pendingPath, { force: true }).catch(() => undefined) |
| 625 | const message = error instanceof Error ? error.message : String(error) |
| 626 | const failed: HtmlThumbnailTask = { |
| 627 | ...queued, |
| 628 | status: 'failed', |
| 629 | error: message |
| 630 | } |
| 631 | backgroundTasks.set(key, failed) |
| 632 | await persistTask(normalized, 'failed', '', message).catch(() => undefined) |
| 633 | emitTaskChanged(failed) |
| 634 | backgroundTasks.delete(key) |
| 635 | } |
| 636 | }).catch(() => backgroundTasks.delete(key)) |
| 637 | |
| 638 | return { ...queued } |
| 639 | } |
| 640 | |
| 641 | export async function enqueueHtmlThumbnails( |
| 642 | requests: HtmlThumbnailRequest[], |
| 643 | options: { force?: boolean; delayMs?: number } = {} |
| 644 | ): Promise<HtmlThumbnailTask[]> { |
| 645 | const tasks: HtmlThumbnailTask[] = [] |
| 646 | for (let index = 0; index < requests.length; index += 1) { |
| 647 | tasks.push( |
| 648 | await enqueueHtmlThumbnail(requests[index], { |
| 649 | force: options.force, |
| 650 | delayMs: options.delayMs |
| 651 | }) |
| 652 | ) |
| 653 | } |
| 654 | return tasks |
| 655 | } |
| 656 |