wkr-util/esm/unhandled-handlers.js

Utility library for wkr project.

/*
 * Some useful functions for handling unhandledRejection and uncaughtException
 */

import {logLevels} from './log'

// a simple handler to use if no other is available
export const fallbackOnUncaughtException = err => {
    console.error('Uncaught exception. Exiting. Got error: ', err)
    process.exit(11)
}

// a simple handler to use if no other is available
export const fallbackOnUnhandledRejection = err => {
    console.error('Unhandled promise rejection. Exiting. Got error: ', err)
    process.exit(22)
}

export const attachLoggingOnUncaughtException = (logRepo) => {
    // need to remove the fallback handler or else it will exit before our better handler is called
    process.off('uncaughtException', fallbackOnUncaughtException)

    process.on('uncaughtException', async (err) => {
        await logRepo.add(
            'unhandled-exception',
            logLevels.FATAL,
            'Got an unhandled exception.',
            {},
            undefined,
            err,
        )

        console.error('Unhandled exception. Exiting. Got error:', err)
        process.exit(11)
    })
}

export const attachLoggingOnUnhandledRejection = (logRepo) => {
    // need to remove the fallback handler or else it will exit before our better handler is called
    process.off('unhandledRejection', fallbackOnUnhandledRejection)

    process.on('unhandledRejection', async (err) => {
        await logRepo.add(
            'unhandled-promise-rejection',
            logLevels.FATAL,
            'Got an unhandled promise rejection.',
            {},
            undefined,
            err,
        )

        console.error('Unhandled promise rejection. Exiting. Got error:', err)
        process.exit(22)
    })
}