Hono RPCHandler Abnormal Behaviour

by ADMIN 35 views

Introduction

As a developer, integrating oRPC with a Node.js backend using Hono can be a complex task. The oRPC (oRPC) framework provides a robust way to handle remote procedure calls, but it can be challenging to set up correctly. In this article, we will explore the issue of abnormal behavior with the RPCHandler imported from @orpc/server/fetch when used with Hono.

Understanding oRPC and Hono

oRPC is a framework for building robust and scalable RPC systems. It provides a simple and efficient way to handle remote procedure calls, making it an ideal choice for building microservices-based applications. Hono, on the other hand, is a Node.js framework for building event-driven applications. It provides a simple and efficient way to handle events and integrate with other services.

The Issue with RPCHandler

The issue with RPCHandler is that it is unable to send requests properly from Hono to the oRPC procedure. The Zod validator on the side of oRPC receives an undefined input and responds with an "Input validation failed" 400 error. This is a critical issue, as it prevents the application from functioning correctly.

Alternative Approach

Interestingly, when we set up a server client that consumes the request directly with an app.post() inside Hono, the procedure and Zod validation went through successfully. This suggests that the issue is specific to the RPCHandler and not a general problem with oRPC or Hono.

Code Reproduction

The code that aims to reproduce this issue is available on GitHub. The code includes the server client method that we used as an alternative approach. This code can be used as a reference to understand the issue and potential solutions.

Potential Causes

There are several potential causes for this issue:

  • Incorrect configuration: The RPCHandler may not be configured correctly, leading to issues with sending requests.
  • Zod validator issues: The Zod validator may be configured incorrectly, leading to issues with input validation.
  • Hono integration issues: There may be issues with integrating Hono with oRPC, leading to problems with sending requests.

Conclusion

In conclusion, the abnormal behavior with RPCHandler when used with Hono is a complex issue that requires careful investigation. By understanding the potential causes and exploring alternative approaches, we can identify the root cause of the issue and implement a solution. We hope that this article has provided valuable insights and helped to nudge you in the right direction.

Troubleshooting Steps

To troubleshoot this issue, follow these steps:

  1. Check the RPCHandler configuration: Ensure that the RPCHandler is configured correctly and that the request is being sent correctly.
  2. Verify the Zod validator configuration: Ensure that the Zod validator is configured correctly and that the input is being validated correctly.
  3. Investigate Hono integration issues: Investigate potential issues with integrating Hono with oRPC and ensure that the request is being sent correctly.
  4. Use the alternative approach: Use the alternative approach of setting up a server client that consumes the request directly with an app.post() inside Hono.

Future Work

Future work on this issue may involve:

  • Implementing a custom RPCHandler: Implementing a custom RPCHandler that can handle the request correctly.
  • Improving the Zod validator: Improving the Zod validator to handle input validation correctly.
  • Enhancing Hono integration: Enhancing the integration between Hono and oRPC to handle requests correctly.

Conclusion

In conclusion, the abnormal behavior with RPCHandler when used with Hono is a complex issue that requires careful investigation. By understanding the potential causes and exploring alternative approaches, we can identify the root cause of the issue and implement a solution. We hope that this article has provided valuable insights and helped to nudge you in the right direction.

Code

// Import required modules
const { RPCHandler } = require('@orpc/server/fetch');
const { Hono } = require('hono');
const { ZodValidator } = require('zod');

// Define the oRPC procedure
const procedure = async (req, res) => {
  // Handle the request
  const input = req.body;
  // Validate the input using Zod
  const validator = ZodValidator.create({
    input: input,
  });
  if (!validator.issues.length) {
    // Process the input
    const result = await processInput(input);
    // Return the result
    return res.json({ result });
  } else {
    // Return an error
    return res.status(400).json({ error: 'Input validation failed' });
  }
};

// Define the Hono application
const app = new Hono();

// Define the RPCHandler
const rpchandler = new RPCHandler({
  procedure,
});

// Define the server client
const serverClient = (req, res) => {
  // Consume the request directly with an app.post() inside Hono
  app.post('/procedure', (c) => {
    // Handle the request
    const input = c.req.body;
    // Validate the input using Zod
    const validator = ZodValidator.create({
      input: input,
    });
    if (!validator.issues.length) {
      // Process the input
      const result = await processInput(input);
      // Return the result
      return c.json({ result });
    } else {
      // Return an error
      return c.status(400).json({ error: 'Input validation failed' });
    }
  });
};

// Start the server
app.use(rpchandler);
app.use(serverClient);
app.listen(3000, () => {
  console.log('Server listening on port 3000');
});

Troubleshooting Steps

  1. Check the RPCHandler configuration: Ensure that the RPCHandler is configured correctly and that the request is being sent correctly.
  2. Verify the Zod validator configuration: Ensure that the Zod validator is configured correctly and that the input is being validated correctly.
  3. Investigate Hono integration issues: Investigate potential issues with integrating Hono with oRPC and ensure that the request is being sent correctly.
  4. Use the alternative approach: Use the alternative approach of setting up a server client that consumes the request directly with an app.post() inside Hono.
    Hono RPCHandler Abnormal Behaviour: Q&A =====================================

Introduction

In our previous article, we explored the issue of abnormal behavior with the RPCHandler imported from @orpc/server/fetch when used with Hono. We discussed the potential causes of this issue and provided troubleshooting steps to help resolve the problem. In this article, we will answer some frequently asked questions (FAQs) related to this issue.

Q: What is the RPCHandler and how does it work?

A: The RPCHandler is a module imported from @orpc/server/fetch that handles remote procedure calls (RPCs) in oRPC. It is responsible for sending requests to the oRPC procedure and receiving responses.

Q: What is the issue with the RPCHandler when used with Hono?

A: The issue with the RPCHandler when used with Hono is that it is unable to send requests properly from Hono to the oRPC procedure. The Zod validator on the side of oRPC receives an undefined input and responds with an "Input validation failed" 400 error.

Q: What are the potential causes of this issue?

A: The potential causes of this issue include:

  • Incorrect configuration: The RPCHandler may not be configured correctly, leading to issues with sending requests.
  • Zod validator issues: The Zod validator may be configured incorrectly, leading to issues with input validation.
  • Hono integration issues: There may be issues with integrating Hono with oRPC, leading to problems with sending requests.

Q: How can I troubleshoot this issue?

A: To troubleshoot this issue, follow these steps:

  1. Check the RPCHandler configuration: Ensure that the RPCHandler is configured correctly and that the request is being sent correctly.
  2. Verify the Zod validator configuration: Ensure that the Zod validator is configured correctly and that the input is being validated correctly.
  3. Investigate Hono integration issues: Investigate potential issues with integrating Hono with oRPC and ensure that the request is being sent correctly.
  4. Use the alternative approach: Use the alternative approach of setting up a server client that consumes the request directly with an app.post() inside Hono.

Q: What is the alternative approach to using the RPCHandler?

A: The alternative approach to using the RPCHandler is to set up a server client that consumes the request directly with an app.post() inside Hono. This approach involves creating a new route in Hono that handles the request and sends it to the oRPC procedure.

Q: How can I implement the alternative approach?

A: To implement the alternative approach, follow these steps:

  1. Create a new route in Hono: Create a new route in Hono that handles the request and sends it to the oRPC procedure.
  2. Use the app.post() method: Use the app.post() method to handle the request and send it to the oRPC procedure.
  3. Validate the input: Validate the input using the Zod validator to ensure that it is correct.
  4. Process the input: Process the input and send the response back to the client.

Q: What are the benefits of using the alternative approach?

A: The benefits of using the alternative approach include:

  • Improved request handling: The alternative approach allows for improved request handling and validation.
  • Better error handling: The alternative approach provides better error handling and response management.
  • Increased flexibility: The alternative approach provides increased flexibility and customization options.

Conclusion

In conclusion, the abnormal behavior with the RPCHandler when used with Hono is a complex issue that requires careful investigation. By understanding the potential causes and exploring alternative approaches, we can identify the root cause of the issue and implement a solution. We hope that this article has provided valuable insights and helped to nudge you in the right direction.

Code

// Import required modules
const { RPCHandler } = require('@orpc/server/fetch');
const { Hono } = require('hono');
const { ZodValidator } = require('zod');

// Define the oRPC procedure
const procedure = async (req, res) => {
  // Handle the request
  const input = req.body;
  // Validate the input using Zod
  const validator = ZodValidator.create({
    input: input,
  });
  if (!validator.issues.length) {
    // Process the input
    const result = await processInput(input);
    // Return the result
    return res.json({ result });
  } else {
    // Return an error
    return res.status(400).json({ error: 'Input validation failed' });
  }
};

// Define the Hono application
const app = new Hono();

// Define the server client
const serverClient = (req, res) => {
  // Consume the request directly with an app.post() inside Hono
  app.post('/procedure', (c) => {
    // Handle the request
    const input = c.req.body;
    // Validate the input using Zod
    const validator = ZodValidator.create({
      input: input,
    });
    if (!validator.issues.length) {
      // Process the input
      const result = await processInput(input);
      // Return the result
      return c.json({ result });
    } else {
      // Return an error
      return c.status(400).json({ error: 'Input validation failed' });
    }
  });
};

// Start the server
app.use(serverClient);
app.listen(3000, () => {
  console.log('Server listening on port 3000');
});

Troubleshooting Steps

  1. Check the RPCHandler configuration: Ensure that the RPCHandler is configured correctly and that the request is being sent correctly.
  2. Verify the Zod validator configuration: Ensure that the Zod validator is configured correctly and that the input is being validated correctly.
  3. Investigate Hono integration issues: Investigate potential issues with integrating Hono with oRPC and ensure that the request is being sent correctly.
  4. Use the alternative approach: Use the alternative approach of setting up a server client that consumes the request directly with an app.post() inside Hono.