// New creates a new CircuitBreaker middleware
func New(condition threshold.Predicate, fallback middleware.Middleware, options Options) (*CircuitBreaker, error) {
if condition == nil || fallback == nil {
return nil, fmt.Errorf("provide non nil condition and fallback")
}
o, err := setDefaults(options)
if err != nil {
return nil, err
}
mt, err := metrics.NewRoundTripMetrics(metrics.RoundTripOptions{TimeProvider: o.TimeProvider})
if err != nil {
return nil, err
}
cb := &CircuitBreaker{
tm: o.TimeProvider,
o: o,
condition: condition,
fallback: fallback,
metrics: mt,
m: &sync.RWMutex{},
checkPeriod: o.CheckPeriod,
}
return cb, nil
}
func statsOK() *metrics.RoundTripMetrics {
m, err := metrics.NewRoundTripMetrics(metrics.RoundTripOptions{})
if err != nil {
panic(err)
}
return m
}
func statsLatencyAtQuantile(quantile float64, value time.Duration) *metrics.RoundTripMetrics {
m, err := metrics.NewRoundTripMetrics(metrics.RoundTripOptions{})
if err != nil {
panic(err)
}
m.RecordMetrics(&request.BaseAttempt{Duration: value})
return m
}
func statsResponseCodes(codes ...statusCode) *metrics.RoundTripMetrics {
m, err := metrics.NewRoundTripMetrics(metrics.RoundTripOptions{})
if err != nil {
panic(err)
}
for _, c := range codes {
for i := int64(0); i < c.Count; i++ {
m.RecordMetrics(&request.BaseAttempt{Response: &http.Response{StatusCode: c.Code}})
}
}
return m
}
func statsNetErrors(threshold float64) *metrics.RoundTripMetrics {
m, err := metrics.NewRoundTripMetrics(metrics.RoundTripOptions{})
if err != nil {
panic(err)
}
for i := 0; i < 100; i++ {
if i < int(threshold*100) {
m.RecordMetrics(&request.BaseAttempt{Error: fmt.Errorf("boo")})
} else {
m.RecordMetrics(&request.BaseAttempt{Response: &http.Response{StatusCode: 200}})
}
}
return m
}