Catching business logic specific errors thrown by Durable object RPC Calls from a worker

S

Suman!•11/28/24, 7:38 AM

Hi guys!! What is the recommended way to catch business logic specific errors created by the RPC Functions? I am able to throw and catch the Javascript Errors. But there are scenarios where i would want to let the worker know if it's a 404 or some business related exceptions. How would I communicate that?
Is it recommended to JSON.stringify the message into a custom error object? Error(JSON.stringify(code:400,.message:"Not possible to do this action"))

Thanks in advance.

1

1984 Ford Laser•11/28/24, 10:16 AM

You would have to identify the errors that you would expect in your business logic, then be ready to catch it. When you do a

return new Response('This is a result', {status: some_number_you_pick})

return new Response('This is a result', {status: some_number_you_pick})

return new Response('This is a result', {status: some_number_you_pick})

return new Response('This is a result', {status: some_number_you_pick}) just pick a number between 400-499 and make your Worker react to that code accordingly

L

Larry•11/28/24, 1:28 PM

I'm not sure why it works, but looking at my code, I don't ever

JSON.stringify()

JSON.stringify()

JSON.stringify()

JSON.stringify()

export class HTTPError extends Error {
  constructor(message, status) {
    super(message)
    this.status = status
    this.body = { error: { message, status } }
  }
}

export class HTTPError extends Error {
  constructor(message, status) {
    super(message)
    this.status = status
    this.body = { error: { message, status } }
  }
}

export class HTTPError extends Error {
  constructor(message, status) {
    super(message)
    this.status = status
    this.body = { error: { message, status } }
  }
}

export class HTTPError extends Error {
  constructor(message, status) {
    super(message)
    this.status = status
    this.body = { error: { message, status } }
  }
}

then...

export function throwIf(condition, message, status = 400) {
  if (condition) {
    throw new HTTPError(message, status)
  }
  return true
}

export function throwIf(condition, message, status = 400) {
  if (condition) {
    throw new HTTPError(message, status)
  }
  return true
}

export function throwIf(condition, message, status = 400) {
  if (condition) {
    throw new HTTPError(message, status)
  }
  return true
}

export function throwIf(condition, message, status = 400) {
  if (condition) {
    throw new HTTPError(message, status)
  }
  return true
}

then, at the beginning of every handler, I have as much as a dozen or so lines like this...

throwIf(personValue == null && personIDString == null, 'body.personValue or body.personIDString required', 400)

throwIf(personValue == null && personIDString == null, 'body.personValue or body.personIDString required', 400)

throwIf(personValue == null && personIDString == null, 'body.personValue or body.personIDString required', 400)

throwIf(personValue == null && personIDString == null, 'body.personValue or body.personIDString required', 400)

Catching business logic specific errors thrown by Durable object RPC Calls from a worker

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