mirror of https://github.com/prometheus/prometheus
71 lines
1.4 KiB
Go
71 lines
1.4 KiB
Go
// Copyright 2021 The Prometheus Authors
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package testutil
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import (
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"net"
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"sync"
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"testing"
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)
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var (
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mu sync.Mutex
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usedPorts []int
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)
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// RandomUnprivilegedPort returns valid unprivileged random port number which can be used for testing.
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func RandomUnprivilegedPort(t *testing.T) int {
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t.Helper()
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mu.Lock()
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defer mu.Unlock()
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port, err := getPort()
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if err != nil {
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t.Fatal(err)
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}
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for portWasUsed(port) {
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port, err = getPort()
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if err != nil {
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t.Fatal(err)
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}
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}
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usedPorts = append(usedPorts, port)
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return port
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}
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func portWasUsed(port int) bool {
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for _, usedPort := range usedPorts {
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if port == usedPort {
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return true
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}
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}
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return false
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}
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func getPort() (int, error) {
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listener, err := net.Listen("tcp", ":0")
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if err != nil {
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return 0, err
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}
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if err := listener.Close(); err != nil {
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return 0, err
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}
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return listener.Addr().(*net.TCPAddr).Port, nil
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}
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