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70 lines
1.4 KiB
70 lines
1.4 KiB
// 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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