Wrangler Pages Deployment Tail Debugging Blog Post Click-Through Rate Report

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Hi everyone! Today, I want to share with you how to debug your Function cloud functions using Wrangler Pages Deployment Tail. During the deployment and debugging process, there are some key points to keep in mind, and I hope these tips will be helpful.

What are Wrangler Pages and Deployment Tail?

First, let’s briefly introduce Wrangler Pages and Deployment Tail. Wrangler is a powerful CLI tool used to manage and deploy Cloudflare Workers and Pages. The Deployment Tail feature allows us to view deployment logs in real time, which is super handy for debugging and pinpointing issues.

Step 1: Deploy Your Cloud Function

Before we start debugging, we need to make sure our cloud function is successfully deployed. Deploying with Wrangler is quite straightforward. Just run the following command:

wrangler publish

This command will upload and deploy your cloud function code to Cloudflare Workers.

Step 2: Start Deployment Tail

After a successful deployment, we can use the Deployment Tail feature to view logs in real time. Run the following command:

wrangler pages deployment tail

This will start a real-time log viewing tool to help us monitor and debug our cloud function.

Tips to Keep in Mind

1. Re-run the Command: After each deployment, you need to re-run the wrangler pages deployment tail command. This is because the cloud function environment might change with each deployment, and re-running the command ensures you get the latest log information.

2. Log Output to Console: When debugging cloud functions, the most crucial aspect is checking the log information. Make sure to use console.log in your code to output debug information. Logs will be directly shown in the console, which is very convenient:
   

   addEventListener('fetch', event => {
       console.log('Incoming request:', event.request);
       event.respondWith(handleRequest(event.request));
   });
   
   async function handleRequest(request) {
       console.log('Processing request...');
       // Your function logic here
       return new Response('Hello World', { status: 200 });
   }
   

3. Pay Attention to Error Messages: During debugging, be sure to pay attention to error messages in the logs. These messages can help you quickly locate where the issue is. For example, if you see messages like Uncaught Error, it indicates that there are unhandled exceptions in your code.

4. Log Level Settings: For better debugging, sometimes you need to adjust the log levels. For instance, you can use console.error to output error messages and console.warn for warnings. This helps in distinguishing different types of logs more clearly.

Summary

Lastly, I’d like to add a personal recommendation: I strongly suggest taking control of your own destiny. If you can manage your own server, it’s often better to do so rather than relying on cloud functions. Similarly, if you can set up your own server, it’s generally preferable to avoid using cloud servers. Of course, everything comes down to a balance between time and cost. As they say, time is money!

Using Wrangler Pages Deployment Tail to debug Function cloud functions can make our development and debugging process more efficient. Remember to re-run the command after each deployment, focus on the console output logs, and adjust log levels as needed. I hope these tips help you, and happy debugging!

If you have any questions or thoughts, feel free to leave a comment and discuss!