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ratelimiterflag.go
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ratelimiterflag.go
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package ratelimiterflag
import (
"time"
"github.com/spf13/pflag"
"golang.org/x/time/rate"
"k8s.io/client-go/util/workqueue"
)
// Options are options for rate limiter.
type Options struct {
// RateLimiterBaseDelay is the base delay for ItemExponentialFailureRateLimiter.
RateLimiterBaseDelay time.Duration
// RateLimiterMaxDelay is the max delay for ItemExponentialFailureRateLimiter.
RateLimiterMaxDelay time.Duration
// RateLimiterQPS is the qps for BucketRateLimiter
RateLimiterQPS int
// RateLimiterBucketSize is the bucket size for BucketRateLimiter
RateLimiterBucketSize int
}
// AddFlags adds flags to the specified FlagSet.
func (o *Options) AddFlags(fs *pflag.FlagSet) {
fs.DurationVar(&o.RateLimiterBaseDelay, "rate-limiter-base-delay", 5*time.Millisecond, "The base delay for rate limiter.")
fs.DurationVar(&o.RateLimiterMaxDelay, "rate-limiter-max-delay", 1000*time.Second, "The max delay for rate limiter.")
fs.IntVar(&o.RateLimiterQPS, "rate-limiter-qps", 10, "The QPS for rate limier.")
fs.IntVar(&o.RateLimiterBucketSize, "rate-limiter-bucket-size", 100, "The bucket size for rate limier.")
}
// DefaultControllerRateLimiter provide a default rate limiter for controller, and users can tune it by corresponding flags.
func DefaultControllerRateLimiter(opts Options) workqueue.RateLimiter {
// set defaults
if opts.RateLimiterBaseDelay <= 0 {
opts.RateLimiterBaseDelay = 5 * time.Millisecond
}
if opts.RateLimiterMaxDelay <= 0 {
opts.RateLimiterMaxDelay = 1000 * time.Second
}
if opts.RateLimiterQPS <= 0 {
opts.RateLimiterQPS = 10
}
if opts.RateLimiterBucketSize <= 0 {
opts.RateLimiterBucketSize = 100
}
return workqueue.NewMaxOfRateLimiter(
workqueue.NewItemExponentialFailureRateLimiter(opts.RateLimiterBaseDelay, opts.RateLimiterMaxDelay),
&workqueue.BucketRateLimiter{Limiter: rate.NewLimiter(rate.Limit(opts.RateLimiterQPS), opts.RateLimiterBucketSize)},
)
}