circuit

circuit.js

const config = {
  name: 'appCounter',
  slidingWindowSize: 6, // Failure Rate Calculation is done on the last 6 iterations
  minimumNumberOfCalls: 3, // 3 iterations are needed to start calculating the failure rate, and see if circuit should be opened or not
  failureRateThreshold: 60, // If half of the iterations or more are failing, the circuit is switched to Opened state.
  slowCallDurationThreshold: 500, // An iteration is considered as being slow if the iteration lasts more than 1s
  slowCallRateThreshold: 50, // If at least 80% of the iterations are considered as being slow, the circuit is switched to Opened state.
  permittedNumberOfCallsInHalfOpenState: 2, // When the circuit is in Half Opened state, the circuit accepts 2 iterations in this state.
  openStateDelay: 10000, // The circuit stays in Opened state for 10s
  halfOpenStateMaxDelay: 30000,
}

// Sliding counter
const slidingCountBreaker = new SlidingCountBreaker(config)
  
// Create fallback
 const fallback = new Fallback({
  callback(err) {
    // Every time the method rejects, You can filter here
    if (err) {
      return err.message
    }
  },
})
  
// Creates a circuit
const orderCircuit = new Circuit({
  name: 'Order Operations',
  options: {
    prometheus: {
      name: 'orderCircuit',
    },
    modules: [slidingCountBreaker, fallback],
  },
})