WebAssets-Pdf-Generator/server.js at main · Tactition/WebAssets-Pdf-Generator · GitHub

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const express = require('express');
const puppeteer = require('puppeteer');
const PQueue = require('p-queue').default;
const crypto = require('crypto');

const app = express();
const PORT = process.env.PORT || 3000;

// Middleware
app.use(express.json());

// Queue configuration - Max 2 concurrent PDF generations
const pdfQueue = new PQueue({
    concurrency: 2,
    timeout: 150000,  // 2.5 minutes for large PDFs
    throwOnTimeout: true
});

// Job storage
const jobHistory = [];
const MAX_HISTORY = 100;
const completedJobs = new Map(); // jobId -> {pdfBuffer, metadata}
const JOB_RETENTION = 5 * 60 * 1000; // Keep completed PDFs for 5 minutes

// Daily statistics
let dailyStats = {
    date: new Date().toDateString(),
    total: 0,
    success: 0,
    failed: 0,
    totalDuration: 0,
    totalSize: 0
};

const log = (level, event, data = {}) => {
    const timestamp = new Date().toISOString();
    console.log(JSON.stringify({ timestamp, level, event, ...data }));
};

const logMemory = () => {
    const used = process.memoryUsage().heapUsed / 1024 / 1024;
    return Math.round(used * 100) / 100;
};

// Reset daily stats at midnight
setInterval(() => {
    const today = new Date().toDateString();
    if (dailyStats.date !== today) {
        dailyStats = { date: today, total: 0, success: 0, failed: 0, totalDuration: 0, totalSize: 0 };
    }
}, 60000);

// Cleanup old completed jobs
setInterval(() => {
    const now = Date.now();
    for (const [jobId, job] of completedJobs.entries()) {
        if (now - job.completedAt > JOB_RETENTION) {
            completedJobs.delete(jobId);
            log('INFO', 'JOB_EXPIRED', { jobId });
        }
    }
}, 30000);

// Health check
app.get('/health', (req, res) => {
    res.json({
        status: 'healthy',
        uptime: process.uptime(),
        queue: {
            size: pdfQueue.size,
            pending: pdfQueue.pending
        }
    });
});

// Dashboard
app.get('/', (req, res) => {
    const uptime = Math.floor(process.uptime());
    const queueSize = pdfQueue.size;
    const processing = pdfQueue.pending;

    // Calculate stats
    const avgDuration = dailyStats.total > 0 ? (dailyStats.totalDuration / dailyStats.total).toFixed(2) : 0;
    const avgSize = dailyStats.total > 0 ? Math.round(dailyStats.totalSize / dailyStats.total / 1024) : 0;
    const successRate = dailyStats.total > 0 ? ((dailyStats.success / dailyStats.total) * 100).toFixed(1) : 0;

    const recentJobs = jobHistory.slice(-20).reverse();

    const logsHtml = recentJobs.map(job => {
        const statusBadge = job.status === 'completed' ?
            '<span class="px-2 py-1 text-xs font-bold rounded bg-green-100 text-green-700">✓ Success</span>' :
            '<span class="px-2 py-1 text-xs font-bold rounded bg-red-100 text-red-700">✗ Failed</span>';

        const sizeDisplay = job.fileSize ? `${Math.round(job.fileSize / 1024)}KB` : '-';
        const memDisplay = job.memoryUsed ? `${job.memoryUsed}MB` : '-';
        const queueWait = job.queueWaitTime ? `${job.queueWaitTime.toFixed(1)}s` : '0s';

        return `
            <tr class="${job.status === 'completed' ? 'bg-green-50' : 'bg-red-50'}">
                <td class="p-3 border-b text-sm">${new Date(job.completedAt).toLocaleTimeString()}</td>
                <td class="p-3 border-b text-sm">${statusBadge}</td>
                <td class="p-3 border-b text-sm font-mono truncate max-w-xs" title="${job.filename}">${job.filename}</td>
                <td class="p-3 border-b text-sm text-gray-600">${job.duration.toFixed(2)}s</td>
                <td class="p-3 border-b text-sm text-gray-600">${sizeDisplay}</td>
                <td class="p-3 border-b text-sm text-gray-600">${memDisplay}</td>
                <td class="p-3 border-b text-sm text-gray-600">${queueWait}</td>
                ${job.error ? `<td class="p-3 border-b text-sm text-red-600 max-w-xs truncate" title="${job.error}">${job.error}</td>` : '<td class="p-3 border-b"></td>'}
            </tr>
        `;
    }).join('');

    const html = `
<!DOCTYPE html>
<html><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>PDF Service Dashboard</title><script src="https://cdn.tailwindcss.com"></script>
<meta http-equiv="refresh" content="5"></head>
<body class="bg-gray-100 min-h-screen p-8">
<div class="max-w-7xl mx-auto">

<!-- Header -->
<div class="bg-white rounded-xl shadow-sm p-6 mb-6">
    <div class="flex justify-between items-center">
        <div>
            <h1 class="text-3xl font-bold text-gray-800">📄 WebAssets PDF Service</h1>
            <p class="text-gray-500 text-sm mt-1">Production Dashboard • Uptime: ${uptime}s • Auto-refresh: 5s</p>
        </div>
        <div class="text-right">
            <div class="text-xs text-gray-400 uppercase tracking-widest font-semibold">Total Jobs</div>
            <div class="text-4xl font-bold text-indigo-600">${dailyStats.total}</div>
        </div>
    </div>
</div>

<!-- Queue Status -->
<div class="grid grid-cols-1 md:grid-cols-4 gap-4 mb-6">
    <div class="bg-white rounded-lg shadow-sm p-4">
        <div class="flex items-center justify-between">
            <div>
                <p class="text-gray-500 text-xs font-semibold uppercase">Queue Size</p>
                <p class="text-2xl font-bold text-orange-600">${queueSize}</p>
            </div>
            <div class="text-4xl">⏳</div>
        </div>
    </div>
    <div class="bg-white rounded-lg shadow-sm p-4">
        <div class="flex items-center justify-between">
            <div>
                <p class="text-gray-500 text-xs font-semibold uppercase">Processing</p>
                <p class="text-2xl font-bold text-blue-600">${processing}/2</p>
            </div>
            <div class="text-4xl">⚙️</div>
        </div>
    </div>
    <div class="bg-white rounded-lg shadow-sm p-4">
        <div class="flex items-center justify-between">
            <div>
                <p class="text-gray-500 text-xs font-semibold uppercase">Success Rate</p>
                <p class="text-2xl font-bold text-green-600">${successRate}%</p>
            </div>
            <div class="text-4xl">✅</div>
        </div>
    </div>
    <div class="bg-white rounded-lg shadow-sm p-4">
        <div class="flex items-center justify-between">
            <div>
                <p class="text-gray-500 text-xs font-semibold uppercase">Failed Today</p>
                <p class="text-2xl font-bold text-red-600">${dailyStats.failed}</p>
            </div>
            <div class="text-4xl">❌</div>
        </div>
    </div>
</div>

<!-- Daily Stats -->
<div class="bg-white rounded-xl shadow-sm p-6 mb-6">
    <h2 class="text-xl font-bold text-gray-800 mb-4">📈 Today's Performance (${dailyStats.date})</h2>
    <div class="grid grid-cols-2 md:grid-cols-4 gap-4">
        <div class="text-center p-3 bg-gray-50 rounded-lg">
            <p class="text-gray-500 text-xs font-semibold uppercase">Avg Duration</p>
            <p class="text-xl font-bold text-gray-800">${avgDuration}s</p>
        </div>
        <div class="text-center p-3 bg-gray-50 rounded-lg">
            <p class="text-gray-500 text-xs font-semibold uppercase">Avg File Size</p>
            <p class="text-xl font-bold text-gray-800">${avgSize}KB</p>
        </div>
        <div class="text-center p-3 bg-gray-50 rounded-lg">
            <p class="text-gray-500 text-xs font-semibold uppercase">Completed</p>
            <p class="text-xl font-bold text-green-600">${dailyStats.success}</p>
        </div>
        <div class="text-center p-3 bg-gray-50 rounded-lg">
            <p class="text-gray-500 text-xs font-semibold uppercase">Memory Usage</p>
            <p class="text-xl font-bold text-gray-800">${logMemory()}MB</p>
        </div>
    </div>
</div>

<!-- Job History -->
<div class="bg-white rounded-xl shadow-sm overflow-hidden">
    <div class="p-4 border-b flex justify-between items-center">
        <h2 class="font-semibold text-gray-700">Recent Jobs (Last 20)</h2>
        <a href="" class="text-sm text-indigo-500 hover:text-indigo-700">↻ Refresh</a>
    </div>
    <div class="overflow-x-auto">
        <table class="w-full">
            <thead><tr class="bg-gray-50">
                <th class="p-3 border-b text-xs font-semibold text-gray-500 uppercase text-left">Time</th>
                <th class="p-3 border-b text-xs font-semibold text-gray-500 uppercase text-left">Status</th>
                <th class="p-3 border-b text-xs font-semibold text-gray-500 uppercase text-left">Filename</th>
                <th class="p-3 border-b text-xs font-semibold text-gray-500 uppercase text-left">Duration</th>
                <th class="p-3 border-b text-xs font-semibold text-gray-500 uppercase text-left">Size</th>
                <th class="p-3 border-b text-xs font-semibold text-gray-500 uppercase text-left">Memory</th>
                <th class="p-3 border-b text-xs font-semibold text-gray-500 uppercase text-left">Queue Wait</th>
                <th class="p-3 border-b text-xs font-semibold text-gray-500 uppercase text-left">Error</th>
            </tr></thead>
            <tbody>${recentJobs.length > 0 ? logsHtml : '<tr><td colspan="8" class="p-8 text-center text-gray-400 italic">No jobs yet</td></tr>'}</tbody>
        </table>
    </div>
</div>

<div class="mt-6 text-center text-xs text-gray-400">
    Powered by WebAssets • Docker + Chromium + p-queue
</div>

</div></body></html>`;
    res.send(html);
});

// Generate PDF (queued)
app.post('/generate', async (req, res) => {
    const jobId = crypto.randomUUID();
    const { targetUrl, secretKey, filename } = req.body;

    // Auth check
    const AUTH_TOKEN = process.env.PDF_SECRET_KEY || 'default_secret_key_change_me';
    if (secretKey !== AUTH_TOKEN) {
        return res.status(401).json({ status: 'error', message: 'Invalid secret key' });
    }

    if (!targetUrl) {
        return res.status(400).json({ status: 'error', message: 'Missing targetUrl' });
    }

    const queuedAt = Date.now();
    const position = pdfQueue.size + 1;
    const estimatedWait = position * 4; // ~4s per job

    log('INFO', 'JOB_QUEUED', { jobId, position, filename });

    // Add to queue (non-blocking)
    pdfQueue.add(async () => {
        return await processPDFJob(jobId, targetUrl, filename || 'document.pdf', queuedAt);
    }).catch(err => {
        log('ERROR', 'JOB_FAILED', { jobId, error: err.message });
    });

    // Return immediately with job ID
    res.json({
        status: 'queued',
        jobId,
        position,
        estimatedWait: `~${estimatedWait} seconds`,
        statusUrl: `/status/${jobId}`,
        downloadUrl: `/download/${jobId}`
    });
});

// Check job status
app.get('/status/:jobId', (req, res) => {
    const { jobId } = req.params;

    const completed = completedJobs.get(jobId);
    if (completed) {
        return res.json({ status: 'completed', ...completed.metadata });
    }

    const inHistory = jobHistory.find(j => j.jobId === jobId);
    if (inHistory) {
        if (inHistory.status === 'failed') {
            return res.json({ status: 'failed', error: inHistory.error });
        }
        return res.json({ status: inHistory.status });
    }

    // Check if in queue
    if (pdfQueue.size > 0 || pdfQueue.pending > 0) {
        return res.json({ status: 'queued', message: 'Job is in queue or processing' });
    }

    res.status(404).json({ status: 'not_found', message: 'Job not found' });
});

// Download PDF
app.get('/download/:jobId', (req, res) => {
    const { jobId } = req.params;
    const job = completedJobs.get(jobId);

    if (!job) {
        return res.status(404).json({ status: 'error', message: 'PDF not found or expired' });
    }

    res.setHeader('Content-Type', 'application/pdf');
    res.setHeader('Content-Disposition', `attachment; filename="${job.metadata.filename}"`);
    res.send(job.pdfBuffer);

    log('INFO', 'PDF_DOWNLOADED', { jobId });
});

// Process PDF job
async function processPDFJob(jobId, targetUrl, filename, queuedAt) {
    let browser = null;
    const startTime = Date.now();
    const queueWaitTime = (startTime - queuedAt) / 1000;
    const memBefore = process.memoryUsage().heapUsed;

    try {
        log('INFO', 'JOB_STARTED', { jobId, targetUrl });

        browser = await puppeteer.launch({
            headless: 'new',
            args: [
                '--no-sandbox',
                '--disable-setuid-sandbox',
                '--disable-dev-shm-usage',
                '--disable-accelerated-2d-canvas',
                '--no-first-run',
                '--no-zygote',
                '--disable-gpu'
            ]
        });

        const page = await browser.newPage();

        // Set timeout for ALL page operations (including PDF generation)
        page.setDefaultTimeout(120000); // 2 minutes for large PDFs

        await page.setExtraHTTPHeaders({
            'ngrok-skip-browser-warning': 'true',
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
        });

        log('INFO', 'NAVIGATING', { jobId, targetUrl });
        await page.goto(targetUrl, { waitUntil: 'networkidle0', timeout: 60000 });
        log('INFO', 'PAGE_LOADED', { jobId });

        log('INFO', 'GENERATING_PDF', { jobId });
        const pdfBuffer = await page.pdf({
            format: 'A4',
            printBackground: true,
            margin: { top: '0px', right: '0px', bottom: '0px', left: '0px' }
        });

        const duration = (Date.now() - startTime) / 1000;
        const memAfter = process.memoryUsage().heapUsed;
        const memoryUsed = Math.round((memAfter - memBefore) / 1024 / 1024);

        const metadata = {
            jobId,
            filename,
            duration,
            fileSize: pdfBuffer.length,
            memoryUsed,
            queueWaitTime,
            completedAt: Date.now()
        };

        // Store completed job
        completedJobs.set(jobId, { pdfBuffer, metadata });

        // Update history
        jobHistory.push({
            jobId,
            status: 'completed',
            filename,
            duration,
            fileSize: pdfBuffer.length,
            memoryUsed,
            queueWaitTime,
            completedAt: Date.now(),
            error: null
        });

        if (jobHistory.length > MAX_HISTORY) jobHistory.shift();

        // Update daily stats
        dailyStats.total++;
        dailyStats.success++;
        dailyStats.totalDuration += duration;
        dailyStats.totalSize += pdfBuffer.length;

        log('SUCCESS', 'JOB_COMPLETED', { jobId, duration, size: pdfBuffer.length });

    } catch (error) {
        const duration = (Date.now() - startTime) / 1000;

        jobHistory.push({
            jobId,
            status: 'failed',
            filename,
            duration,
            fileSize: 0,
            memoryUsed: 0,
            queueWaitTime,
            completedAt: Date.now(),
            error: error.message
        });

        if (jobHistory.length > MAX_HISTORY) jobHistory.shift();

        dailyStats.total++;
        dailyStats.failed++;

        log('ERROR', 'JOB_FAILED', { jobId, error: error.message });
        throw error;

    } finally {
        if (browser) {
            await browser.close();
        }
    }
}

// Start server
app.listen(PORT, '0.0.0.0', () => {
    log('INFO', 'SERVER_STARTED', { port: PORT });
    log('INFO', 'DASHBOARD', { url: `http://localhost:${PORT}` });
    log('INFO', 'QUEUE_CONFIG', { concurrency: 2, timeout: 60000 });
});