Error handling

Learn how to handle errors in your scripts.

Error codes

Cloud Code returns a 422 status error if your script throws an exception.

Use the error code or error type for your error-handling logic, instead of the error message returned from the Cloud Code API error response. Error messages can change in the future, but the error codes and type remain the same.

Error wrapping

Wrap your code in try/catch blocks to handle errors. If an error occurs, you can log it and return an error to the client.

For example, you can use a non-wrapped function:

JavaScript

const { CurrenciesApi } = require("@unity-services/economy-2.4");

module.exports = async ({ params, context, logger }) => {
  const { projectId, playerId } = context;
  const { currencyId } = params;

  const currencies = new CurrenciesApi(context);

  const setBalance = await currencies.setPlayerCurrencyBalance({ projectId, playerId, currencyId, currencyBalanceRequest: { balance: 100 } });
  const decrement = await currencies.decrementPlayerCurrencyBalance({ projectId, playerId, currencyId, currencyModifyBalanceRequest: { amount: 50 } });
  const increment = await currencies.incrementPlayerCurrencyBalance({ projectId, playerId, currencyId, currencyModifyBalanceRequest: { amount: 10 } });
  const result = await currencies.getPlayerCurrencies({ projectId, playerId });

  return result.data;
}

The non-wrapped function returns an error if any of the API calls fail. However, if you wrap your API calls, you can log out the error message and get more details about the error:

JavaScript

const { CurrenciesApi } = require("@unity-services/economy-2.4");

module.exports = async ({ params, context, logger }) => {
  const { projectId, playerId } = context;
  const { currencyId } = params;

  const currencies = new CurrenciesApi(context);

  try {
    const setBalance = await currencies.setPlayerCurrencyBalance({ projectId, playerId, currencyId, currencyBalanceRequest: { balance: 100 } });
    const decrement = await currencies.decrementPlayerCurrencyBalance({ projectId, playerId, currencyId, currencyModifyBalanceRequest: { amount: 50 } });
    const increment = await currencies.incrementPlayerCurrencyBalance({ projectId, playerId, currencyId, currencyModifyBalanceRequest: { amount: 10 } });
    const result = await currencies.getPlayerCurrencies({ projectId, playerId });

    return result.data;
  } catch (err) {
    logger.error("Failed to increment currency", {"error.message": err.message}, {"currencyId" : currencyId});
    throw err;
  }
}

To check the logs and view the details, open the Unity Cloud Dashboard and select Products > Cloud Code > Logs.

Logging

You can use the logger object to log errors and warnings to help you debug your scripts. You can log messages at different levels of severity. These levels can help you query logs in the Unity Cloud Dashboard.

Cloud Code automatically adds attributes such as playerId, environmentId and projectId to the logs, so you don't need to add them to your log messages.

JavaScript

logger.debug(message, ...logAttributes)
logger.info(message, ...logAttributes)
logger.warning(message, ...logAttributes)
logger.error(message, ...logAttributes)
logger.fatal(message, ...logAttributes)

You can add custom log attributes to have more context about the log message. For example, you can add the currencyId to the log message when a call to Economy fails:

JavaScript

logger.error("Failed to increment currency", {"error.message": err.message}, {"currencyId" : params.currencyId});

Navigate to the Unity Cloud Dashboard and select Cloud Code > Logs to view and filter the logs.

Refer to Emit logs for more information.

Debugging on the Unity Cloud Dashboard

You can debug your scripts through the Unity Cloud Dashboard.

Navigate to Cloud Code > Scripts and select the script you want to debug.

The Response tab and the script editor help indicate where errors have occurred.

The Response tab shows the line and column of an error. The debugger uses this information and adds an annotation to visually indicate where the error occurred in the Script Code section.

The error annotation stays visible until you edit the script or when you run the script again.

The following is an example of how to handle and throw an error.

JavaScript

const { CurrenciesApi } = require("@unity-services/economy-2.4");

module.exports = async ({ params, context, logger }) => {
  const { playerId, projectId } = context;
  const { currencyId } = params;

  const currencies = new CurrenciesApi(context);

  try {
    const setBalance = await currencies.setPlayerCurrencyBalance({
      projectId,
      playerId,
      currencyId,
      currencyBalanceRequest: {
        balance: 100,
      }
    });
  } catch (err) {
    if (err.response) {
      logger.error("Failed to set currency", { "error.response": err.response }, {"currencyId": currencyId});
    } else {
      logger.error("Failed to set currency", { "error.message": err.message }, {"currencyId": currencyId});
    }

    throw Error('oops');
  }

}

Error handling#

Error codes#

Error wrapping#

Logging#

Debugging on the Unity Cloud Dashboard#

Error handling

Error codes

Error wrapping

Logging

Debugging on the Unity Cloud Dashboard