Name: MoleculerJS
Author: Moleculer

Added in: v0.7.6

The Moleculer has a built-in circuit-breaker solution.

What is the circuit breaker?
Read more about circuit breaker on Martin Fowler blog.

If you enable it, every service call will be protected by a built-in circuit breaker.

Enable it in the broker options

const broker = new ServiceBroker({
    circuitBreaker: {
        enabled: true,
        maxFailures: 5,
        halfOpenTime: 10 * 1000,
        failureOnTimeout: true,
        failureOnReject: true
    }
});

Settings

Name	Type	Default	Description
`enabled`	`Boolean`	`false`	Enable the protection
`maxFailures`	`3`	`false`	Breaker trips after 3 failures
`halfOpenTime`	`Number`	`10000`	Number of milliseconds to switch from `open` to `half-open` state
`failureOnTimeout`	`Boolean`	`true`	Increment failures if the request is timed out
`failureOnReject`	`Boolean`	`true`	Increment failures if the request is rejected (by any `Error`)

If the circuit-breaker state is changed, ServiceBroker will send internal & metrics events.