72c0789f38
* allow setting min log level for logger * generated protobuf --------- Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
// Copyright 2023 LiveKit, Inc.
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//
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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 utils
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import (
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"context"
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"time"
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"go.uber.org/multierr"
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)
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type HedgeParams[T any] struct {
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Timeout time.Duration
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RetryDelay time.Duration
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MaxAttempts int
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IsRecoverable func(err error) bool
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Func func(context.Context) (T, error)
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}
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// race retries if the function takes too long to return
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// |---------------- attempt 1 ----------------|
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// | delay |--------- attempt 2 ---------|
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func HedgeCall[T any](ctx context.Context, params HedgeParams[T]) (v T, err error) {
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ctx, cancel := context.WithTimeout(ctx, params.Timeout)
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defer cancel()
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type result struct {
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value T
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err error
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}
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ch := make(chan result, params.MaxAttempts)
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race := func() {
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value, err := params.Func(ctx)
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ch <- result{value, err}
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}
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var attempt int
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delay := time.NewTimer(0)
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defer delay.Stop()
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for {
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select {
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case <-delay.C:
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go race()
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if attempt++; attempt < params.MaxAttempts {
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delay.Reset(params.RetryDelay)
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}
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case res := <-ch:
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if res.err == nil || params.IsRecoverable == nil || !params.IsRecoverable(res.err) {
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return res.value, res.err
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}
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err = multierr.Append(err, res.err)
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case <-ctx.Done():
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err = multierr.Append(err, ctx.Err())
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return
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}
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}
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}
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