509 lines
18 KiB
JavaScript
509 lines
18 KiB
JavaScript
const path = require('path');
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const fs = require('fs-extra');
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/**
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* 下载执行器 - 负责具体的下载逻辑执行
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*/
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class DownloadExecutor {
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constructor(fileManager, taskManager, progressManager, historyManager, downloadService) {
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this.fileManager = fileManager;
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this.taskManager = taskManager;
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this.progressManager = progressManager;
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this.historyManager = historyManager;
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this.downloadService = downloadService; // 添加下载服务引用
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}
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/**
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* 执行单个作品下载
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*/
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async executeArtworkDownload(task, images, size, artworkDir, artwork) {
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try {
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const results = [];
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for (let index = 0; index < images.length; index++) {
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if (task.status === 'cancelled') {
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break;
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}
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// 从图片对象中获取指定尺寸的URL
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const imageObj = images[index];
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let imageUrl;
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// 根据size参数选择对应的URL
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switch (size) {
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case 'original':
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imageUrl = imageObj.original;
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break;
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case 'large':
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imageUrl = imageObj.large;
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break;
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case 'medium':
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imageUrl = imageObj.medium;
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break;
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case 'square_medium':
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imageUrl = imageObj.square_medium;
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break;
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default:
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imageUrl = imageObj.original || imageObj.large || imageObj.medium;
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}
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// 确保imageUrl是字符串
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if (typeof imageUrl !== 'string') {
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console.error(`图片URL不是字符串:`, imageUrl);
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task.failed_files++;
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this.progressManager.notifyProgressUpdate(task.id, task);
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results.push({ success: false, error: '图片URL格式错误' });
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continue;
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}
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const fileName = `image_${index + 1}.${this.getFileExtension(imageUrl)}`;
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const filePath = path.join(artworkDir, fileName);
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// 检查文件是否已存在且完整
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if (await this.fileManager.fileExists(filePath)) {
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// 验证文件完整性
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const integrity = await this.fileManager.checkFileIntegrity(filePath);
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if (integrity.valid) {
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task.completed_files++;
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task.progress = Math.round((task.completed_files / task.total_files) * 100);
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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results.push({ success: true, file: fileName, skipped: true });
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continue;
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} else {
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// 文件不完整，删除重新下载
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console.log(`文件不完整，重新下载: ${filePath}`);
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await this.fileManager.safeDeleteFile(filePath);
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}
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}
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try {
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// 确保目录存在
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await this.fileManager.ensureDirectory(path.dirname(filePath));
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// 下载文件并等待完成
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await this.fileManager.downloadFile(imageUrl, filePath);
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// 验证下载的文件完整性
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const integrity = await this.fileManager.checkFileIntegrity(filePath);
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if (!integrity.valid) {
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throw new Error(`文件下载不完整: ${integrity.reason}`);
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}
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task.completed_files++;
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task.progress = Math.round((task.completed_files / task.total_files) * 100);
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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results.push({ success: true, file: fileName });
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} catch (error) {
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task.failed_files++;
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console.error(`下载图片失败 ${index + 1}: ${error.message}`);
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this.progressManager.notifyProgressUpdate(task.id, task);
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results.push({ success: false, error: error.message });
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}
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}
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// 保存作品信息
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const infoPath = path.join(artworkDir, 'artwork_info.json');
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await fs.writeJson(infoPath, artwork, { spaces: 2 });
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// 更新任务状态 - 确保所有文件都处理完成后再更新
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task.status = task.failed_files === 0 ? 'completed' : 'partial';
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task.end_time = new Date();
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task.progress = 100;
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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// 添加到历史记录
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const historyItem = {
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id: task.id,
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type: 'artwork',
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artwork_id: task.artwork_id,
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artist_name: task.artist_name,
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artwork_title: task.artwork_title,
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download_path: artworkDir,
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total_files: task.total_files,
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completed_files: task.completed_files,
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failed_files: task.failed_files,
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start_time: task.start_time,
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end_time: task.end_time instanceof Date ? task.end_time.toISOString() : task.end_time,
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status: task.status,
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};
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await this.historyManager.addHistoryItem(historyItem);
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} catch (error) {
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console.error('异步下载执行失败:', error);
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task.status = 'failed';
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task.error = error.message;
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task.end_time = new Date();
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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}
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}
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/**
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* 执行批量下载
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*/
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async executeBatchDownload(task, artworkIds, options) {
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const { concurrent = 3, size = 'original', quality = 'high', format = 'auto' } = options;
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try {
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const results = [];
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const recentCompleted = []; // 最近完成的作品列表
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// 分批下载
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for (let i = 0; i < artworkIds.length; i += concurrent) {
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if (task.status === 'cancelled') {
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break;
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}
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const batch = artworkIds.slice(i, i + concurrent);
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const batchPromises = batch.map(async artworkId => {
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try {
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// 使用专门的批量下载方法，避免创建重复任务
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const downloadResult = await this.downloadService.downloadSingleArtworkForBatch(artworkId, {
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size,
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quality,
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format,
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skipExisting: true
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});
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if (downloadResult.success) {
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// 检查是否跳过下载
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if (downloadResult.skipped) {
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// 跳过下载，不计入失败，但也不计入完成
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const result = { artwork_id: artworkId, success: true, skipped: true };
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results.push(result);
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return result;
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} else {
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// 真正下载成功
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task.completed_files++;
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// 添加到最近完成列表
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const completedItem = {
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artwork_id: artworkId,
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artwork_title: downloadResult.artwork_title || `作品 ${artworkId}`,
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artist_name: downloadResult.artist_name || '未知作者'
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};
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recentCompleted.unshift(completedItem);
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// 只保留最近5个
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if (recentCompleted.length > 5) {
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recentCompleted.pop();
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}
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// 更新任务的recent_completed
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task.recent_completed = [...recentCompleted];
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const result = { artwork_id: artworkId, success: true };
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results.push(result);
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return result;
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}
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} else {
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// 下载失败
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task.failed_files++;
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const result = { artwork_id: artworkId, success: false, error: downloadResult.error };
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results.push(result);
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return result;
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}
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} catch (error) {
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// 异常情况
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task.failed_files++;
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const result = { artwork_id: artworkId, success: false, error: error.message };
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results.push(result);
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return result;
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}
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});
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await Promise.all(batchPromises);
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// 更新进度并通知
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task.progress = Math.round((task.completed_files / task.total_files) * 100);
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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// 添加延迟避免请求过于频繁
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if (i + concurrent < artworkIds.length) {
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await new Promise(resolve => setTimeout(resolve, 1000));
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}
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}
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// 更新任务状态
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task.status = task.failed_files === 0 ? 'completed' : 'partial';
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task.end_time = new Date();
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task.results = results;
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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// 添加到历史记录
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const historyItem = {
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id: task.id,
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type: 'batch',
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total_files: task.total_files,
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completed_files: task.completed_files,
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failed_files: task.failed_files,
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start_time: task.start_time,
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end_time: task.end_time instanceof Date ? task.end_time.toISOString() : task.end_time,
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status: task.status,
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};
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await this.historyManager.addHistoryItem(historyItem);
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} catch (error) {
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task.status = 'failed';
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task.error = error.message;
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task.end_time = new Date();
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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}
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}
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/**
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* 执行作者作品下载
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*/
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async executeArtistDownload(task, newArtworks, options) {
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const { maxConcurrent = 3, size = 'original', quality = 'high', format = 'auto' } = options;
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try {
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const results = [];
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const recentCompleted = []; // 最近完成的作品列表
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// 分批下载作品
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for (let i = 0; i < newArtworks.length; i += maxConcurrent) {
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if (task.status === 'cancelled') {
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break;
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}
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const batch = newArtworks.slice(i, i + maxConcurrent);
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const batchPromises = batch.map(async artwork => {
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try {
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// 使用专门的批量下载方法，避免创建重复任务
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const downloadResult = await this.downloadService.downloadSingleArtworkForBatch(artwork.id, {
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size,
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quality,
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format,
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skipExisting: true
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});
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if (downloadResult.success) {
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// 检查是否跳过下载
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if (downloadResult.skipped) {
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// 跳过下载，不计入失败，但也不计入完成
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const result = { artwork_id: artwork.id, success: true, skipped: true };
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results.push(result);
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return result;
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} else {
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// 真正下载成功
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task.completed_files++;
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// 添加到最近完成列表
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const completedItem = {
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artwork_id: artwork.id,
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artwork_title: downloadResult.artwork_title || artwork.title || `作品 ${artwork.id}`,
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artist_name: downloadResult.artist_name || artwork.user?.name || '未知作者'
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};
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recentCompleted.unshift(completedItem);
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// 只保留最近5个
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if (recentCompleted.length > 5) {
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recentCompleted.pop();
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}
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// 更新任务的recent_completed
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task.recent_completed = [...recentCompleted];
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const result = { artwork_id: artwork.id, success: true };
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results.push(result);
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return result;
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}
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} else {
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// 下载失败
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task.failed_files++;
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const result = { artwork_id: artwork.id, success: false, error: downloadResult.error };
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results.push(result);
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return result;
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}
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} catch (error) {
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// 异常情况
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task.failed_files++;
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const result = { artwork_id: artwork.id, success: false, error: error.message };
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results.push(result);
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return result;
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}
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});
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await Promise.all(batchPromises);
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// 更新进度并通知
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task.progress = Math.round((task.completed_files / task.total_files) * 100);
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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// 添加延迟避免请求过于频繁
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if (i + maxConcurrent < newArtworks.length) {
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await new Promise(resolve => setTimeout(resolve, 1000));
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}
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}
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// 更新任务状态
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task.status = task.failed_files === 0 ? 'completed' : 'partial';
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task.end_time = new Date();
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task.results = results;
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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// 添加到历史记录
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const historyItem = {
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id: task.id,
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type: 'artist',
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artist_name: task.artist_name,
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total_files: task.total_files,
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completed_files: task.completed_files,
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failed_files: task.failed_files,
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start_time: task.start_time,
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end_time: task.end_time instanceof Date ? task.end_time.toISOString() : task.end_time,
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status: task.status,
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};
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await this.historyManager.addHistoryItem(historyItem);
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} catch (error) {
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task.status = 'failed';
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task.error = error.message;
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task.end_time = new Date();
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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}
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}
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/**
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* 执行排行榜作品下载
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*/
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async executeRankingDownload(task, newArtworks, options) {
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const { maxConcurrent = 3, size = 'original', quality = 'high', format = 'auto' } = options;
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try {
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const results = [];
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const recentCompleted = []; // 最近完成的作品列表
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// 分批下载作品
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for (let i = 0; i < newArtworks.length; i += maxConcurrent) {
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if (task.status === 'cancelled') {
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break;
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}
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const batch = newArtworks.slice(i, i + maxConcurrent);
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const batchPromises = batch.map(async artwork => {
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try {
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// 使用专门的批量下载方法，避免创建重复任务
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const downloadResult = await this.downloadService.downloadSingleArtworkForBatch(artwork.id, {
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size,
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quality,
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format,
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skipExisting: true
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});
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if (downloadResult.success) {
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// 检查是否跳过下载
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if (downloadResult.skipped) {
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// 跳过下载，不计入失败，但也不计入完成
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const result = { artwork_id: artwork.id, success: true, skipped: true };
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results.push(result);
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return result;
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} else {
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// 真正下载成功
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task.completed_files++;
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// 添加到最近完成列表
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const completedItem = {
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artwork_id: artwork.id,
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artwork_title: downloadResult.artwork_title || artwork.title || `作品 ${artwork.id}`,
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artist_name: downloadResult.artist_name || artwork.user?.name || '未知作者'
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};
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recentCompleted.unshift(completedItem);
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// 只保留最近5个
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if (recentCompleted.length > 5) {
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recentCompleted.pop();
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}
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// 更新任务的recent_completed
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task.recent_completed = [...recentCompleted];
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const result = { artwork_id: artwork.id, success: true };
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results.push(result);
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return result;
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}
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} else {
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// 下载失败
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task.failed_files++;
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const result = { artwork_id: artwork.id, success: false, error: downloadResult.error };
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results.push(result);
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return result;
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}
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} catch (error) {
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// 异常情况
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task.failed_files++;
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const result = { artwork_id: artwork.id, success: false, error: error.message };
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results.push(result);
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return result;
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}
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});
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await Promise.all(batchPromises);
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// 更新进度并通知
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task.progress = Math.round((task.completed_files / task.total_files) * 100);
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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// 添加延迟避免请求过于频繁
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if (i + maxConcurrent < newArtworks.length) {
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await new Promise(resolve => setTimeout(resolve, 1000));
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}
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}
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// 更新任务状态
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task.status = task.failed_files === 0 ? 'completed' : 'partial';
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task.end_time = new Date();
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task.results = results;
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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// 添加到历史记录
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const historyItem = {
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id: task.id,
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type: 'ranking',
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total_files: task.total_files,
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completed_files: task.completed_files,
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failed_files: task.failed_files,
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start_time: task.start_time,
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end_time: task.end_time instanceof Date ? task.end_time.toISOString() : task.end_time,
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status: task.status,
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};
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await this.historyManager.addHistoryItem(historyItem);
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} catch (error) {
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task.status = 'failed';
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task.error = error.message;
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task.end_time = new Date();
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await this.taskManager.saveTasks();
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this.progressManager.notifyProgressUpdate(task.id, task);
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}
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}
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/**
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* 获取文件扩展名
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*/
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getFileExtension(url) {
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if (typeof url !== 'string') {
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console.warn('URL不是字符串，使用默认扩展名:', url);
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return 'jpg';
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}
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const match = url.match(/\.([a-zA-Z0-9]+)(?:\?|$)/);
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return match ? match[1] : 'jpg';
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}
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}
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module.exports = DownloadExecutor;
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