54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
/*
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Copyright 2021 Alibaba Group Holding Limited.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package local
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import (
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"sync"
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"k8s.io/apimachinery/pkg/util/rand"
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)
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var (
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lockedPortsMu sync.Mutex
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lockedPorts = make(map[int]interface{})
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)
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func AcquireLocalPort() int {
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lockedPortsMu.Lock()
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defer lockedPortsMu.Unlock()
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const min, max = 5000, 6000
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if len(lockedPorts) >= max-min {
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panic("exhaust")
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}
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for {
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port := rand.IntnRange(min, max)
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if _, ok := lockedPorts[port]; !ok {
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lockedPorts[port] = nil
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return port
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}
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}
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}
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func ReleaseLocalPort(port int) {
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lockedPortsMu.Lock()
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defer lockedPortsMu.Unlock()
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delete(lockedPorts, port)
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}
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