runner-middy

@dazn/chaos-squirrel-runner-middy

Integrate the Chaos Runner into your Middy middleware.

Usage

import chaosRunnerMiddleware from '@dazn/chaos-squirrel-runner-middy';
import ChaosRunner from '@dazn/chaos-squirrel-runner';
import CPUAttack from '@dazn/chaos-squirrel-attack-cpu';
import middy from '@middy/core';

const createRunner = ChaosRunner.configure({
  probability: 1,
  possibleAttacks: [
    {
      probability: 0.01,
      createAttack: CPUAttack.configure({ allowLoopEvery: 10 }),
    },
  ],
});

const originalHandler = async () => {
  // your lambda here
  // there may be some chaos going on!
};

const handler = middy(originalHandler).use(
  chaosRunnerMiddleware({
    createRunner,
    wait: true,
    createLogger: (context) => {
      return (level, message, details) => {
        // call a logger which is attached to the lambda context
        context.logger[level](message, details);
      };
    },
  })
);

export { handler };

Middy Runner Arguments

Parameter	Type	Default	Description
createRunner	Function	-	A function which returns a new instance of ChaosRunner
wait	Boolean	true	Whether to wait for async chaos functions to complete, for example waiting for all files to be created for the open files attack
createLogger	Function	-	Optional. A function which is called with the Lambda context, which must return a valid logger function (see Chaos Runner for logger docs). This is useful when the context has a custom logger or correlation IDs attached, which you want to include in any logs