mirror of
https://github.com/go-vikunja/vikunja.git
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51 lines
1.7 KiB
Go
51 lines
1.7 KiB
Go
// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-present Vikunja and contributors. All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package utils
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import (
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"time"
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"code.vikunja.io/api/pkg/log"
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)
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// RetryWithBackoff executes the given function up to 3 times with exponential backoff.
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// Delays between retries are 1s, 2s, 4s (total max wait: 7s).
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// The name parameter is used for logging to identify what operation is being retried.
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// Returns nil on success, or the last error after all retries are exhausted.
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func RetryWithBackoff(name string, fn func() error) error {
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const maxRetries = 3
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baseDelay := 1 * time.Second
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var err error
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for attempt := 1; attempt <= maxRetries; attempt++ {
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err = fn()
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if err == nil {
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return nil
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}
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if attempt < maxRetries {
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delay := baseDelay * time.Duration(1<<(attempt-1)) // exponential: 1s, 2s, 4s
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log.Warningf("%s not available (attempt %d/%d), retrying in %v: %s",
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name, attempt, maxRetries, delay, err)
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time.Sleep(delay)
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}
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}
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log.Errorf("%s not available after %d attempts: %s", name, maxRetries, err)
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return err
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}
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