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| package main
import (
"os"
"sync"
"time"
logger "github.com/sirupsen/logrus"
"github.com/x-cray/logrus-prefixed-formatter"
)
func init() {
logger.SetFormatter(&prefixed.TextFormatter{
TimestampFormat: "2006-01-02 15:04:05",
FullTimestamp: true,
ForceFormatting: true,
DisableColors: true,
})
logger.SetOutput(os.Stdout)
logger.SetLevel(logger.DebugLevel)
}
type TokenBucket struct {
mu sync.Mutex
startTime time.Time
availableTokens int64
capacity int64
fillInterval time.Duration
lastTick int64
}
func NewTokenBucket(qps, capacity int64) *TokenBucket {
return &TokenBucket{
startTime: time.Now(),
availableTokens: capacity,
capacity: capacity,
lastTick: 0,
fillInterval: time.Duration(int64(time.Second) / qps),
}
}
func (tb *TokenBucket) adjust() {
if (tb.availableTokens) >= tb.capacity {
return
}
now := time.Now()
tick := int64(now.Sub(tb.startTime) / tb.fillInterval)
tb.availableTokens += tick - tb.lastTick
if tb.availableTokens > tb.capacity {
tb.availableTokens = tb.capacity
}
tb.lastTick = tick
}
func (tb *TokenBucket) TakeAvailable(count int64) int64 {
tb.mu.Lock()
defer tb.mu.Unlock()
tb.adjust()
if tb.availableTokens <= 0 {
return 0
}
if count >= tb.availableTokens {
count = tb.availableTokens
}
tb.availableTokens -= count
return count
}
func task(qps, num int64, timeNeed time.Duration) {
logger.Infof("task qps: %v, num: %v, timeNeed: %.3fs", qps, num, timeNeed.Seconds())
bucket := NewTokenBucket(qps, qps)
startTime := time.Now()
lastTime := startTime
for i := int64(1); i <= num; {
if bucket.TakeAvailable(1) == 1 {
time.Sleep(timeNeed)
i++
if i%1000 == 0 {
now := time.Now()
logger.Infof("rate: %.3f", 1000/now.Sub(lastTime).Seconds())
lastTime = now
}
}
}
logger.Infof("task over, used: %.3fs", time.Now().Sub(startTime).Seconds())
}
func main() {
task(10000, 100000, 0)
task(10000, 15000, 2*time.Millisecond)
task(500, 10000, 0)
}
|