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util.go
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util.go
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/*
* Copyright 2019 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package edsbalancer
import "google.golang.org/grpc/balancer/internal/wrr"
type dropper struct {
// Drop rate will be numerator/denominator.
numerator uint32
denominator uint32
w wrr.WRR
category string
}
func newDropper(numerator, denominator uint32, category string) *dropper {
w := newRandomWRR()
w.Add(true, int64(numerator))
w.Add(false, int64(denominator-numerator))
return &dropper{
numerator: numerator,
denominator: denominator,
w: w,
category: category,
}
}
func (d *dropper) drop() (ret bool) {
return d.w.Next().(bool)
}