nodriver chrome profile issue

# Technical Postmortem: nodriver Chrome Profile Navigation Failure

## Summary
User script launches a Chrome profile with `nodriver` but fails to navigate to the target URL. The browser process remains open indefinitely without triggering navigation or cleanup.

## Root Cause
- Using `await` with synchronous `print()` function, causing an unhandled `TypeError`
- Lack of error handling for navigation failures
- Premature script termination due to unawaited exception halting async execution
- Missing resource cleanup guarantees

## Why This Happens in Real Systems
1. Asynchronous execution flow obscures error propagation
2. Over-reliance on artificial delays (`asyncio.sleep`) instead of proper ready-state checks
3. Production debugging challenges with headless browsers
4. Undetected exceptions due to insufficient monitoring/logging
5. Context manager patterns neglected during async resource initialization

## Real-World Impact
- Unreleased browser processes consuming system resources (memory leaks)
- Automation workflows failing silently
- Orphaned Chrome instances accumulating over time
- Containerized environments exceeding resource limits
- Undetected job failures impacting downstream systems

## Example or Code

**Problematic Implementation:**
```python
async def main():
    browser = await start( 
        headless=False,
        user_data_dir=r"C:\Users\AppData\Local\Google\Chrome\User Data",
        profile_directory="Profile 1",
        browser_args=['--disable-blink-features=AutomationControlled'],
        lang="en-US"
    )
    await asyncio.sleep(5)
    await browser.get("https://www.kijiji.ca/m-my-ads/active")
    await asyncio.sleep(13)
    await print("Page loaded")  # TypeError: 'NoneType' not awaitable
    await browser.stop()

Corrected Implementation:

async def main():
    browser = await start(
        headless=False,
        user_data_dir=r"C:\Users\AppData\Local\Google\Chrome\User Data",
        profile_directory="Profile 1",
        browser_args=['--disable-blink-features=AutomationControlled'],
        lang="en-US"
    )
    try:
        await browser.get("https://www.kijiji.ca/m-my-ads/active")
        print("Navigation initiated")
        await asyncio.sleep(13)  # Should be replaced with DOM-ready checks
        print("Page loaded")
    except Exception as e:
        print(f"Operation failed: {str(e)}")
    finally:
        await browser.stop()

How Senior Engineers Fix It

Replace await print() with direct synchronous calls
Wrap navigation logic in try/except/finally blocks
Implement explicit browser instance lifecycle management
Use DOM state checks instead of fixed delays
Add debug logging for critical workflow stages
Validate CDP (Chrome DevTools Protocol) responses
Introduce process monitoring