mirror of https://github.com/k3s-io/k3s
25 lines
712 B
Go
25 lines
712 B
Go
package util
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import "context"
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// ContextForChannel derives a child context from a parent channel.
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//
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// The derived context's Done channel is closed when the returned cancel function
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// is called or when the parent channel is closed, whichever happens first.
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//
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// Note the caller must *always* call the CancelFunc, otherwise resources may be leaked.
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//
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// Backported from https://github.com/kubernetes/apimachinery/blob/v0.25.2/pkg/util/wait/wait.go#L299
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func ContextForChannel(parentCh <-chan struct{}) (context.Context, context.CancelFunc) {
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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select {
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case <-parentCh:
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cancel()
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case <-ctx.Done():
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}
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}()
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return ctx, cancel
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}
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