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feat: support to set the request timeout (#15)
Co-authored-by: rick <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| package limit | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| type RateLimiter interface { | ||
| TryAccept() bool | ||
| Accept() | ||
| Stop() | ||
| Burst() int32 | ||
| } | ||
|
|
||
| type defaultRateLimiter struct { | ||
| qps int32 | ||
| burst int32 | ||
| lastToken time.Time | ||
| singal chan struct{} | ||
| mu sync.Mutex | ||
| } | ||
|
|
||
| func NewDefaultRateLimiter(qps, burst int32) RateLimiter { | ||
| if qps <= 0 { | ||
| qps = 5 | ||
| } | ||
| if burst <= 0 { | ||
| burst = 5 | ||
| } | ||
| limiter := &defaultRateLimiter{ | ||
| qps: qps, | ||
| burst: burst, | ||
| singal: make(chan struct{}, 1), | ||
| } | ||
| go limiter.updateBurst() | ||
| return limiter | ||
| } | ||
|
|
||
| func (r *defaultRateLimiter) TryAccept() bool { | ||
| _, ok := r.resver() | ||
| return ok | ||
| } | ||
|
|
||
| func (r *defaultRateLimiter) resver() (delay time.Duration, ok bool) { | ||
| delay = time.Now().Sub(r.lastToken) / time.Millisecond | ||
| r.lastToken = time.Now() | ||
| if delay > 0 { | ||
| ok = true | ||
| } else if r.Burst() > 0 { | ||
| r.Setburst(r.Burst() - 1) | ||
| ok = true | ||
| } else { | ||
| delay = time.Second / time.Duration(r.qps) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func (r *defaultRateLimiter) Accept() { | ||
| delay, ok := r.resver() | ||
| if ok { | ||
| return | ||
| } | ||
|
|
||
| if delay > 0 { | ||
| time.Sleep(delay) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func (r *defaultRateLimiter) Setburst(burst int32) { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| r.burst = burst | ||
| } | ||
|
|
||
| func (r *defaultRateLimiter) Burst() int32 { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| return r.burst | ||
| } | ||
|
|
||
| func (r *defaultRateLimiter) Stop() { | ||
| r.singal <- struct{}{} | ||
| } | ||
|
|
||
| func (r *defaultRateLimiter) updateBurst() { | ||
| for { | ||
| select { | ||
| case <-time.After(time.Second): | ||
| r.Setburst(r.Burst() + r.qps) | ||
| case <-r.singal: | ||
| return | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| package limit | ||
|
|
||
| import ( | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| func TestXxx(t *testing.T) { | ||
| limiter := NewDefaultRateLimiter(1, 1) | ||
| num := 0 | ||
|
|
||
| loop := true | ||
| go func(l RateLimiter) { | ||
| for loop { | ||
| l.Accept() | ||
| num += 1 | ||
| } | ||
| }(limiter) | ||
|
|
||
| select { | ||
| case <-time.After(time.Second): | ||
| loop = false | ||
| } | ||
| assert.True(t, num <= 10) | ||
| } |