go.temporal.io/server/common/circuitbreaker/circuitbreaker.go
87 LOC · 28 covered · 59 uncovered · 6 ranges · 5 concepts · 4 introducers · 3 tests
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package circuitbreaker
import (
"sync"
"sync/atomic"
"github.com/sony/gobreaker"
"go.temporal.io/server/common/dynamicconfig"
)
type (
TwoStepCircuitBreaker interface {
Name() string
State() gobreaker.State
Counts() gobreaker.Counts
Allow() (done func(success bool), err error)
}
// TwoStepCircuitBreakerWithDynamicSettings is a wrapper of gobreaker.TwoStepCircuitBreaker
// that calls the settingsFn everytime the Allow function is called and replaces the circuit
// breaker if there is a change in the settings object. Note that in this case, the previous
// state of the circuit breaker is lost.
TwoStepCircuitBreakerWithDynamicSettings struct {
name string
readyToTrip func(counts gobreaker.Counts) bool
onStateChange func(name string, from gobreaker.State, to gobreaker.State)
cb atomic.Pointer[gobreaker.TwoStepCircuitBreaker]
cbLock sync.Mutex
settings dynamicconfig.CircuitBreakerSettings
}
Settings struct {
// For the following options, check gobreaker docs for details.
Name string
ReadyToTrip func(counts gobreaker.Counts) bool
OnStateChange func(name string, from gobreaker.State, to gobreaker.State)
}
)
var _ TwoStepCircuitBreaker = (*TwoStepCircuitBreakerWithDynamicSettings)(nil)
// Caller must call UpdateSettings once before using this object.
func NewTwoStepCircuitBreakerWithDynamicSettings(
settings Settings,
return &TwoStepCircuitBreakerWithDynamicSettings{
name: settings.Name,
readyToTrip: settings.ReadyToTrip,
onStateChange: settings.OnStateChange,
}
}
func (c *TwoStepCircuitBreakerWithDynamicSettings) UpdateSettings(
ds dynamicconfig.CircuitBreakerSettings,
c.cbLock.Lock()
defer c.cbLock.Unlock()
if c.cb.Load() != nil && ds == c.settings {
}
c.cb.Store(gobreaker.NewTwoStepCircuitBreaker(gobreaker.Settings{
Name: c.name,
MaxRequests: uint32(ds.MaxRequests),
Interval: ds.Interval,
Timeout: ds.Timeout,
ReadyToTrip: c.readyToTrip,
OnStateChange: c.onStateChange,
}))
}
return c.cb.Load().Name()
}
func (c *TwoStepCircuitBreakerWithDynamicSettings) State() gobreaker.State {
return c.cb.Load().State()
}
func (c *TwoStepCircuitBreakerWithDynamicSettings) Counts() gobreaker.Counts {
return c.cb.Load().Counts()
}
func (c *TwoStepCircuitBreakerWithDynamicSettings) Allow() (done func(success bool), err error) {
circuitbreaker.go ×1
return c.cb.Load().Allow()
}