You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
60 lines
1.2 KiB
60 lines
1.2 KiB
package dao |
|
|
|
import ( |
|
"sync" |
|
"sync/atomic" |
|
|
|
"go-common/library/log" |
|
) |
|
|
|
const ( |
|
_percentThreshold float64 = 0.85 |
|
) |
|
|
|
// Guard count the renew of all operations for self protection |
|
type Guard struct { |
|
expPerMin int64 |
|
expThreshold int64 |
|
facInMin int64 |
|
facLastMin int64 |
|
lock sync.RWMutex |
|
} |
|
|
|
func (g *Guard) setExp(cnt int64) { |
|
g.lock.Lock() |
|
g.expPerMin = cnt * 2 |
|
g.expThreshold = int64(float64(g.expPerMin) * _percentThreshold) |
|
g.lock.Unlock() |
|
} |
|
|
|
func (g *Guard) incrExp() { |
|
g.lock.Lock() |
|
g.expPerMin = g.expPerMin + 2 |
|
g.expThreshold = int64(float64(g.expPerMin) * _percentThreshold) |
|
g.lock.Unlock() |
|
} |
|
|
|
func (g *Guard) updateFac() { |
|
atomic.StoreInt64(&g.facLastMin, atomic.SwapInt64(&g.facInMin, 0)) |
|
} |
|
|
|
func (g *Guard) decrExp() { |
|
g.lock.Lock() |
|
if g.expPerMin > 0 { |
|
g.expPerMin = g.expPerMin - 2 |
|
g.expThreshold = int64(float64(g.expPerMin) * _percentThreshold) |
|
} |
|
g.lock.Unlock() |
|
} |
|
|
|
func (g *Guard) incrFac() { |
|
atomic.AddInt64(&g.facInMin, 1) |
|
} |
|
|
|
func (g *Guard) ok() (is bool) { |
|
is = atomic.LoadInt64(&g.facLastMin) < atomic.LoadInt64(&g.expThreshold) |
|
if is { |
|
log.Warn("discovery is protected, the factual renews(%d) less than expected renews(%d)", atomic.LoadInt64(&g.facLastMin), atomic.LoadInt64(&g.expThreshold)) |
|
} |
|
return |
|
}
|
|
|