forked from TrueCloudLab/restic
63 lines
1.1 KiB
Go
63 lines
1.1 KiB
Go
package backoff
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import (
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"context"
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"time"
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)
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// BackOffContext is a backoff policy that stops retrying after the context
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// is canceled.
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type BackOffContext interface {
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BackOff
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Context() context.Context
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}
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type backOffContext struct {
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BackOff
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ctx context.Context
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}
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// WithContext returns a BackOffContext with context ctx
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//
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// ctx must not be nil
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func WithContext(b BackOff, ctx context.Context) BackOffContext {
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if ctx == nil {
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panic("nil context")
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}
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if b, ok := b.(*backOffContext); ok {
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return &backOffContext{
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BackOff: b.BackOff,
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ctx: ctx,
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}
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}
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return &backOffContext{
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BackOff: b,
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ctx: ctx,
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}
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}
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func ensureContext(b BackOff) BackOffContext {
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if cb, ok := b.(BackOffContext); ok {
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return cb
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}
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return WithContext(b, context.Background())
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}
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func (b *backOffContext) Context() context.Context {
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return b.ctx
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}
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func (b *backOffContext) NextBackOff() time.Duration {
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select {
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case <-b.ctx.Done():
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return Stop
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default:
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}
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next := b.BackOff.NextBackOff()
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if deadline, ok := b.ctx.Deadline(); ok && deadline.Sub(time.Now()) < next {
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return Stop
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}
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return next
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}
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