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[WIP] circuit_breaker

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Edward 2020-05-11 22:15:58 +08:00
parent 8343f7c91d
commit 94b8f71cc6
1 changed files with 25 additions and 23 deletions
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48
resiliency/06_circuit_breaker/circuit_breaker.go
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@ -5,7 +5,7 @@ package circuit
* @Author: Edward * @Author: Edward
* @Date: 2020-05-10 22:00:58 * @Date: 2020-05-10 22:00:58
* @Last Modified by: Edward * @Last Modified by: Edward
* @Last Modified time: 2020-05-11 21:37:13 * @Last Modified time: 2020-05-11 22:15:25
*/ */
import ( import (
@ -86,26 +86,19 @@ type Circuit func(context.Context) error
//ICounter interface //ICounter interface
type ICounter interface { type ICounter interface {
Count(State) Count(State)
ConsecutiveFailures() uint32
LastActivity() time.Time LastActivity() time.Time
Reset() Reset()
} }
type counters struct { type counters struct {
TotalFailures, Requests uint32 Requests uint32
state State lastState State
lastActivity time.Time lastActivity time.Time
counts uint32 //counts of failures counts uint32 //counts of failures
TotalFailures uint32
} TotalSuccesses uint32
ConsecutiveSuccesses uint32
func (c *counters) Count(state State) { ConsecutiveFailures uint32
}
func (c *counters) ConsecutiveFailures() uint32 {
return 0
} }
func (c *counters) LastActivity() time.Time { func (c *counters) LastActivity() time.Time {
@ -116,22 +109,31 @@ func (c *counters) Reset() {
} }
//NewCounter New Counter for Circuit Breaker func (c *counters) Count(statue State) {
func NewCounter() ICounter {
return &counters{} switch statue {
case FailureState:
c.ConsecutiveFailures++
case SuccessState:
c.ConsecutiveSuccesses++
}
c.Requests++
c.lastState = statue
} }
//Breaker of circuit //Breaker of circuit
func Breaker(c Circuit, failureThreshold uint32) Circuit { func Breaker(c Circuit, failureThreshold uint32) Circuit {
cnt := NewCounter() cnt := counters{}
return func(ctx context.Context) error { return func(ctx context.Context) error {
if cnt.ConsecutiveFailures() >= failureThreshold {
canRetry := func(cnt ICounter) bool { if cnt.ConsecutiveFailures >= failureThreshold {
backoffLevel := cnt.ConsecutiveFailures() - failureThreshold canRetry := func(cnt counters) bool {
backoffLevel := cnt.ConsecutiveFailures - failureThreshold
// Calculates when should the circuit breaker resume propagating requests // Calculates when should the circuit breaker resume propagating requests
// to the service // to the service