64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package queue
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import (
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"context"
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"time"
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)
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const (
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backoffBegin = 50 * time.Millisecond
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backoffUpper = 2 * time.Second
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)
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type (
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backoffFuncRetErr[T any] func() (retry bool, ret T, err error)
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backoffFuncErr func() (retry bool, err error)
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)
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func backoffRetErr[T any](ctx context.Context, begin, upper time.Duration, end <-chan time.Time, fn backoffFuncRetErr[T]) (ret T, err error) {
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d := begin
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for {
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// check whether the context has been cancelled or has reached the deadline, return early
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select {
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case <-ctx.Done():
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return ret, ctx.Err()
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case <-end:
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return ret, context.DeadlineExceeded
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default:
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}
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// call the target function
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retry, ret, err := fn()
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if err != nil {
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return ret, err
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}
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if !retry {
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return ret, nil
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}
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// wait for a while before retrying, and also respect the context & deadline
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select {
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case <-ctx.Done():
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return ret, ctx.Err()
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case <-time.After(d):
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d *= 2
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if d > upper {
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d = upper
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}
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case <-end:
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return ret, context.DeadlineExceeded
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}
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}
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}
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func backoffErr(ctx context.Context, begin, upper time.Duration, end <-chan time.Time, fn backoffFuncErr) error {
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_, err := backoffRetErr(ctx, begin, upper, end, func() (retry bool, ret any, err error) {
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retry, err = fn()
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return retry, nil, err
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})
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return err
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}
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