# Migration Guide: Puppeteer to Playwright

This guide will help you migrate from Puppeteer (pyppeteer) to Playwright in your project.

## Overview

The migration from Puppeteer to Playwright provides several benefits:

- Better performance and stability
- Enhanced features for modern web applications
- Active development and community support
- Multi-browser support (Chromium, Firefox, WebKit)

## Pre-Migration Checklist

Before starting the migration, ensure you have:

- [ ] Backed up your current codebase
- [ ] Documented any custom Puppeteer configurations
- [ ] Identified all Puppeteer-specific code in your project
- [ ] Tested your current application thoroughly

## Step-by-Step Migration

### 1. Update Dependencies

Replace Puppeteer dependencies with Playwright:

**Before (requirements.txt):**

```
pyppeteer==1.0.2
```

**After (requirements.txt):**

```
playwright==1.40.0
```

### 2. Install Playwright

```bash
# Install Playwright
pip install playwright

# Install browsers (Chromium is recommended for compatibility)
playwright install chromium

# Install system dependencies (Linux)
playwright install-deps chromium
```

### 3. Update Imports

**Before:**

```python
from pyppeteer import launch
```

**After:**

```python
from playwright.async_api import async_playwright
```

### 4. Update Browser Launch

**Before (Puppeteer):**

```python
browser = await launch(
    headless=True,
    executablePath='/usr/bin/google-chrome',
    args=['--no-sandbox', '--disable-setuid-sandbox'],
    handleSIGINT=False,
    handleSIGTERM=False,
    handleSIGHUP=False,
    ignoreHTTPSErrors=True,
    autoClose=True,
)
```

**After (Playwright):**

```python
playwright = await async_playwright().start()
browser = await playwright.chromium.launch(
    headless=True,
    args=['--no-sandbox', '--disable-setuid-sandbox'],
    ignore_default_args=['--enable-automation'],
)
```

### 5. Update Page Creation

**Before (Puppeteer):**

```python
page = await browser.newPage()
await page.setUserAgent(CUSTOM_USER_AGENT)
await page.setViewport({'width': 1280, 'height': 800})
page.setDefaultNavigationTimeout(30000)
```

**After (Playwright):**

```python
context = await browser.new_context(
    user_agent=CUSTOM_USER_AGENT,
    viewport={'width': 1920, 'height': 1080},
    ignore_https_errors=True,
)
page = await context.new_page()
page.set_default_timeout(30000)
```

### 6. Update Navigation

**Before (Puppeteer):**

```python
response = await page.goto(url, waitUntil='networkidle2', timeout=30000)
```

**After (Playwright):**

```python
response = await page.goto(url, wait_until='networkidle', timeout=30000)
```

### 7. Update Wait Methods

**Before (Puppeteer):**

```python
await page.waitForNetworkIdle(idleTime=500, timeout=30000)
await page.waitForNavigation(waitUntil='networkidle2', timeout=10000)
```

**After (Playwright):**

```python
await page.wait_for_load_state('networkidle', timeout=30000)
await page.wait_for_load_state('networkidle', timeout=10000)
```

### 8. Update Request Interception

**Before (Puppeteer):**

```python
await page.setRequestInterception(True)

async def intercept(request):
    if request.resourceType in ['image', 'media', 'font', 'stylesheet']:
        await request.abort()
    else:
        await request.continue_()

page.on('request', lambda req: asyncio.ensure_future(intercept(req)))
```

**After (Playwright):**

```python
await page.route("**/*", lambda route: route.abort()
               if route.request.resource_type in ['image', 'stylesheet', 'font', 'media']
               else route.continue_())
```

### 9. Update Browser Cleanup

**Before (Puppeteer):**

```python
pages = await browser.pages()
for page in pages:
    await page.close()
await browser.close()
```

**After (Playwright):**

```python
pages = browser.contexts[0].pages if browser.contexts else []
for page in pages:
    await page.close()
await browser.close()
```

## Docker Migration

### Update Dockerfile

**Before:**

```dockerfile
# Install Chrome
RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | gpg --dearmor -o /usr/share/keyrings/google-chrome-keyring.gpg \
    && echo "deb [arch=amd64 signed-by=/usr/share/keyrings/google-chrome-keyring.gpg] http://dl.google.com/linux/chrome/deb/ stable main" | tee /etc/apt/sources.list.d/google-chrome.list \
    && apt-get update \
    && apt-get install -y google-chrome-stable
```

**After:**

```dockerfile
# Install Playwright browsers
RUN playwright install chromium
RUN playwright install-deps chromium
```

## Testing the Migration

### 1. Run the Test Script

```bash
python test_playwright_migration.py
```

This script tests:

- Playwright installation
- Browser utilities
- Browser service functionality

### 2. Manual Testing

Test your key functionality:

- Basic page navigation
- JavaScript execution
- Screenshot capture
- PDF generation (if used)

### 3. Performance Testing

Compare performance metrics:

- Page load times
- Memory usage
- CPU usage
- Browser startup time

## Common Issues and Solutions

### Issue: Browser Not Starting

**Solution:** Ensure Playwright browsers are installed:

```bash
playwright install chromium
```

### Issue: Permission Errors

**Solution:** Install system dependencies:

```bash
playwright install-deps chromium
```

### Issue: Page Navigation Fails

**Solution:** Check timeout settings and network conditions:

```python
# Increase timeout if needed
await page.goto(url, wait_until='networkidle', timeout=60000)
```

### Issue: Memory Leaks

**Solution:** Ensure proper cleanup:

```python
# Always close context and browser
await context.close()
await browser.close()
```

## Performance Optimizations

### 1. Browser Pool Management

```python
# Use browser pooling for better performance
browser_pool = Queue(maxsize=MAX_BROWSERS)
```

### 2. Context Reuse

```python
# Reuse contexts when possible
context = await browser.new_context()
# Use context for multiple pages
```

### 3. Resource Blocking

```python
# Block unnecessary resources
await page.route("**/*", lambda route: route.abort()
               if route.request.resource_type in ['image', 'stylesheet', 'font', 'media']
               else route.continue_())
```

## Rollback Plan

If you need to rollback to Puppeteer:

1. Restore your backup
2. Revert requirements.txt changes
3. Revert Dockerfile changes
4. Test thoroughly

## Post-Migration Checklist

After completing the migration:

- [ ] All tests pass
- [ ] Performance is acceptable
- [ ] No memory leaks detected
- [ ] Error handling works correctly
- [ ] Documentation is updated
- [ ] Team is trained on new API

## Support

If you encounter issues during migration:

1. Check the [Playwright documentation](https://playwright.dev/python/)
2. Review the [migration guide](https://playwright.dev/python/docs/migrate-from-puppeteer)
3. Search existing issues on GitHub
4. Create a new issue with detailed information

## Additional Resources

- [Playwright Python Documentation](https://playwright.dev/python/)
- [Migration Guide from Puppeteer](https://playwright.dev/python/docs/migrate-from-puppeteer)
- [Playwright GitHub Repository](https://github.com/microsoft/playwright)
- [Community Discord](https://discord.gg/playwright)