attack-throw-error

@dazn/chaos-squirrel-attack-throw-error

Causes an error to be thrown - either directly or via setImmediate causing uncaught exception.

Attack options

Parameter	Type	Default	Description
errorClass	ErrConstructor	Error	Instance of that class will be thrown. The class should extend Error.
errorMessage	string	chaos-squirrel: attack-throw-error	Error message
uncaughtException	boolean	false	Flag that decides if uncaught exception is thrown

Examples

Immediately thrown error

import ThrowErrorAttack from '@dazn/chaos-squirrel-attack-throw-error';;

class CustomError extends Error {
  constructor(message?: string) {
    super(message);
  }
}
const errorMessage = 'Chaos!';
const attack = new ThrowErrorAttack({
    errorClass: CustomError,
    errorMessage
});

try {
    attack.start();
} catch (err) {
    err instanceof CustomError // true
    console.log(err.message) // Chaos!
}

Uncaught exception

import ThrowErrorAttack from '@dazn/chaos-squirrel-attack-throw-error';

const attack = new ThrowErrorAttack({ uncaughtException: true });

process.on('uncaughtException', (err) => {
    err instanceof Error // true
    console.log(err.message) // chaos-squirrel: attack-throw-error
})

attack.start();
console.log('Still alive');
// Uncaught exception is thrown via setImmediate so "check" phase

Stopping uncaught exception

import ThrowErrorAttack from '@dazn/chaos-squirrel-attack-throw-error';

const attack = new ThrowErrorAttack({ uncaughtException: true });

attack.start();
attack.stop();
// nothing bad is gonna happen

Uncaught exception

To cause an uncaught exception an error is being thrown from setImmediate callback. See docs.