57 lines
1,022 B
Go
57 lines
1,022 B
Go
package testtool
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import (
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"context"
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"fmt"
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"net"
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"os"
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"strconv"
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"time"
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)
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// GetFreePort returns free local tcp port.
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func GetFreePort() (string, error) {
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addr, err := net.ResolveTCPAddr("tcp", "localhost:0")
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if err != nil {
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return "", err
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}
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l, err := net.ListenTCP("tcp", addr)
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if err != nil {
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return "", err
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}
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defer func() { _ = l.Close() }()
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p := l.Addr().(*net.TCPAddr).Port
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return strconv.Itoa(p), nil
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}
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// WaitForPort tries to connect to given local port with constant backoff.
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//
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// Can be canceled via ctx.
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func WaitForPort(ctx context.Context, port string) {
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t := time.NewTicker(time.Millisecond * 100)
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defer t.Stop()
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for {
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select {
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case <-ctx.Done():
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return
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case <-t.C:
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if err := portIsReady(port); err != nil {
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_, _ = fmt.Fprintf(os.Stderr, "waiting for port: %s\n", err)
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break
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}
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return
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}
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}
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}
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func portIsReady(port string) error {
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conn, err := net.Dial("tcp", net.JoinHostPort("localhost", port))
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if err != nil {
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return err
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}
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return conn.Close()
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}
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