generated from kubernetes/kubernetes-template-project
/
random_allocator.go
85 lines (67 loc) · 1.87 KB
/
random_allocator.go
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/*
Copyright 2023 The Fluid 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 portallocator
import (
"errors"
"math/rand"
"sync"
"time"
"github.com/go-logr/logr"
"k8s.io/apimachinery/pkg/util/net"
)
type RandomAllocator struct {
portRange *net.PortRange
// lock make rand thread safe
lock sync.Mutex
rand *rand.Rand
log logr.Logger
}
func (r *RandomAllocator) needResetReservedPorts() bool {
return false
}
func newRandomAllocator(pr *net.PortRange, log logr.Logger) (*RandomAllocator, error) {
r := rand.New(rand.NewSource(time.Now().UnixNano()))
return &RandomAllocator{
portRange: pr,
rand: r,
log: log,
}, nil
}
func (r *RandomAllocator) Allocate(port int) error {
// not judge whether port can be allocated or not
return nil
}
func (r *RandomAllocator) Release(i int) error {
// no need to release
return nil
}
func (r *RandomAllocator) AllocateBatch(portNum int) (ports []int, err error) {
var availPort int
var allocatedPorts = map[int]bool{}
// prevent infinite for loop
if portNum > r.portRange.Size {
return ports, errors.New("required port size exceeds the configured size")
}
r.lock.Lock()
defer r.lock.Unlock()
for i := 0; i < portNum; {
availPort = r.portRange.Base + r.rand.Intn(r.portRange.Size)
_, ok := allocatedPorts[availPort]
if !ok {
i++
allocatedPorts[availPort] = true
ports = append(ports, availPort)
}
}
return
}