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32 lines
823 B
Go
32 lines
823 B
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package tstest provides utilities for use in unit tests.
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package tstest
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import (
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"context"
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"time"
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"tailscale.com/logtail/backoff"
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"tailscale.com/types/logger"
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)
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// WaitFor retries try for up to maxWait.
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// It returns nil once try returns nil the first time.
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// If maxWait passes without success, it returns try's last error.
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func WaitFor(maxWait time.Duration, try func() error) error {
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bo := backoff.NewBackoff("wait-for", logger.Discard, maxWait/4)
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deadline := time.Now().Add(maxWait)
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var err error
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for time.Now().Before(deadline) {
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err = try()
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if err == nil {
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break
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}
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bo.BackOff(context.Background(), err)
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}
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return err
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}
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