Handling Page Closure in Puppeteer on Error Events

Other Questions Puppeteer
1

I’m looking to automatically close the Puppeteer page whenever an error occurs. There are instances where the page I attempt to load freezes, and the .close() method isn’t triggered as expected. How can I effectively handle this situation?

(async () => {
    const newPage = await browser.newPage();
    await newPage.setViewport({width: screenWidth, height: screenHeight});
    await newPage.goto(data['links'][0]['long_url'], {timeout: 90000});
    await newPage.screenshot({path: './screenshot/' + data['id'] + '.jpg', fullPage: true});
    await newPage.close();
})();
2

To ensure the Puppeteer page reliably closes when an error occurs, you can attach event listeners to detect errors like ‘error’ and ‘pageerror’. This way, you can safely close the page even if it hangs or encounters an unexpected issue.

Here’s an example of how you can modify your function to handle such events:

(async () => {
    const page = await browser.newPage();
    await page.setViewport({ width: screenWidth, height: screenHeight });

    const safeClose = async () => {
        try {
            if (!page.isClosed()) {
                await page.close();
            }
        } catch (err) {
            console.error('Error closing page:', err);
        }
    };

    // Attach event listeners for handling errors
    page.on('error', async (err) => {
        console.error('Page error:', err);
        await safeClose();
    });

    page.on('pageerror', async (err) => {
        console.error('Console error:', err);
        await safeClose();
    });

    page.on('requestfailed', async (request) => {
        console.warn('Request failed:', request.failure());
        await safeClose();
    });

    try {
        await page.goto(data['links'][0]['long_url'], { timeout: 90000 });
        await page.screenshot({ path: './screenshot/' + data['id'] + '.jpg', fullPage: true });
    } catch (err) {
        console.error('Navigation error:', err);
        await safeClose();
    }

    await safeClose(); // Ensure the page is closed after operations
})();

Explanation:

  • safeClose: A utility function that ensures the page is closed safely.
  • Event listeners: Listen to ‘error’, ‘pageerror’, and ‘requestfailed’ to catch various types of errors and respond accordingly.
  • In the catch block of the goto call, any navigation errors are logged, and the page is safely closed.

These additions make your script more robust in handling errors and ensure that the page closes as expected in case of issues.

3
DavidGrant Indeed, ensuring that a Puppeteer page reliably closes on error can save resources and prevent your scripts from lingering unnecessarily. As "CreativePainter33" rightly suggested, attaching event listeners to track errors is a practical approach. Let me add some optimizations.

In the Puppeteer script below, we aim to handle possible errors efficiently:

(async () => {
    const page = await browser.newPage();
    await page.setViewport({ width: screenWidth, height: screenHeight });

    const safeClose = async () => {
        if (!page.isClosed()) {
            await page.close().catch(err => console.error('Error closing page:', err));
        }
    };

    // Attach more specific event handlers
    ['error', 'pageerror', 'requestfailed'].forEach(eventType => {
        page.on(eventType, async (err) => {
            console.warn(`${eventType} occurred:`, err);
            await safeClose();
        });
    });

    try {
        await page.goto(data['links'][0]['long_url'], { timeout: 90000 });
        await page.screenshot({ path: './screenshot/' + data['id'] + '.jpg', fullPage: true });
    } catch (err) {
        console.error('Navigation error:', err);
        await safeClose();
    }

    await safeClose();
})();

Key Highlights:

  • Enhanced Logging: Uses console.warn for events other than fatal errors, giving a precise understanding of non-critical issues.
  • Iterating Events: A smart way to set up multiple event listeners in a concise manner, making future maintenance easier.
  • Practical Error Handling: Wrapped the event handler logic to catch and log potential errors, optimizing resource management.

By implementing these enhancements, you streamline your script’s error handling, making it robust and efficient. This should effectively address freezes or unexpected hangs in your Puppeteer operations.

4

Effective Page Closure on Error

To handle Puppeteer page closure on errors effectively, you can use event listeners to capture errors and close the page gracefully. Here’s a concise example:

javascript
(async () => {
    const page = await browser.newPage();
    await page.setViewport({ width: screenWidth, height: screenHeight });

    const safeClose = async () => {
        if (!page.isClosed()) {
            await page.close().catch(err => console.error('Error closing page:', err));
        }
    };

    // Attach event listeners for error handling
    ['error', 'pageerror', 'requestfailed'].forEach(eventType => {
        page.on(eventType, async () => {
            console.warn(`${eventType} detected`);
            await safeClose();
        });
    });

    try {
        await page.goto(data['links'][0]['long_url'], { timeout: 90000 });
        await page.screenshot({ path: './screenshot/' + data['id'] + '.jpg', fullPage: true });
    } catch (err) {
        console.error('Navigation error:', err);
        await safeClose();
    }
})();

Quick Tips:

  • Use safeClose to safely close the page.
  • Log events with console.warn for error insights.
  • Catch and log errors during page closure for robust error management.
5

Enhancing Error Handling in Puppeteer

There are insightful methods already provided for closing a Puppeteer page on encountering errors. Here's an additional approach, with an emphasis on a modular design for enhancing maintainability and comprehensibility:

javascript
(async () => {
    const page = await browser.newPage();
    await page.setViewport({ width: screenWidth, height: screenHeight });

    const safeClose = async () => {
        if (!page.isClosed()) {
            try {
                await page.close();
            } catch (err) {
                console.error('Error closing page:', err);
            }
        }
    };

    const handlePageError = async (err) => {
        console.error('Error detected:', err);
        await safeClose();
    };

    // Attach event listeners for various error types
    page.on('error', handlePageError);
    page.on('pageerror', handlePageError);
    page.on('requestfailed', async (request) => {
        console.warn('Request failed:', request.failure());
        await safeClose();
    });

    try {
        await page.goto(data['links'][0]['long_url'], { timeout: 90000 });
        await page.screenshot({ path: './screenshot/' + data['id'] + '.jpg', fullPage: true });
    } catch (err) {
        console.error('Navigation error:', err);
        await safeClose();
    }

    await safeClose();
})();

Why This Approach Works Well:

  • handlePageError function is used to centralize the error handling logic, making it reusable and easier to maintain.
  • Encapsulating the safeClose logic within try-catch ensures robust error management during page closures.
  • Using specific handlers enhances readability, indicating distinct types of failures clearly.

This modular design ensures that your Puppeteer script remains organized and adaptable, fostering easier debugging and maintenance in the future.

6

Ensuring Reliable Page Closure on Errors

To automate closing a Puppeteer page when errors occur, it's efficient to utilize event listeners. This approach helps prevent your script from freezing due to unexpected errors. Here’s how you can implement this:

javascript
(async () => {
    const page = await browser.newPage();
    await page.setViewport({ width: screenWidth, height: screenHeight });

    const safeClose = async () => {
        if (!page.isClosed()) {
            await page.close().catch(err => console.error('Error closing page:', err));
        }
    };

    // Setup event listeners for effective error detection
    ['error', 'pageerror', 'requestfailed'].forEach(eventType => {
        page.on(eventType, async (err) => {
            console.warn(`${eventType} occurred:`, err);
            await safeClose();
        });
    });

    try {
        await page.goto(data['links'][0]['long_url'], { timeout: 90000 });
        await page.screenshot({ path: './screenshot/' + data['id'] + '.jpg', fullPage: true });
    } catch (err) {
        console.error('Navigation error:', err);
        await safeClose();
    }

    await safeClose();
})();

Optimization Tips:

  • Use safeClose to ensure the page is closed, catching any closure errors.
  • Implement console.warn for detecting non-critical errors, aiding in debugging.
  • Centralize error handling to streamline your script and improve maintainability.

These methods ensure your Puppeteer script handles errors effectively, optimizing system resources and preventing script hang-ups.