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cleanup: prevent leaks from time.After #11983
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,3 @@ | ||
```release-note:bug | ||
cleanup: prevent leaks from time.After | ||
``` |
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Original file line number | Diff line number | Diff line change |
---|---|---|
|
@@ -572,3 +572,30 @@ func PathEscapesSandbox(sandboxDir, path string) bool { | |
} | ||
return false | ||
} | ||
|
||
// StopFunc is used to stop a time.Timer created with NewSafeTimer | ||
type StopFunc func() | ||
|
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// NewSafeTimer creates a time.Timer but does not panic if duration is <= 0. | ||
// | ||
// Using a time.Timer is recommended instead of time.After when it is necessary | ||
// to avoid leaking goroutines (e.g. in a select inside a loop). | ||
// | ||
// Returns the time.Timer and also a StopFunc, forcing the caller to deal | ||
// with stopping the time.Timer to avoid leaking a goroutine. | ||
func NewSafeTimer(duration time.Duration) (*time.Timer, StopFunc) { | ||
Comment on lines
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There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. I really like the API on this. It makes it really obvious if we're accidentally misusing it by ex. calling |
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if duration <= 0 { | ||
// Avoid panic by using the smallest positive value. This is close enough | ||
// to the behavior of time.After(0), which this helper is intended to | ||
// replace. | ||
// https://go.dev/play/p/EIkm9MsPbHY | ||
duration = 1 | ||
} | ||
|
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t := time.NewTimer(duration) | ||
cancel := func() { | ||
t.Stop() | ||
} | ||
|
||
return t, cancel | ||
} |
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helpers/
not available toapi/
, so no helper function heret.Stop