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Channel safe stop and close #687

Merged
merged 2 commits into from
Jul 15, 2020
Merged

Channel safe stop and close #687

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50749b2
channel common
ucwong Jul 14, 2020
7621540
Merge branch 'master' into dev
ucwong Jul 14, 2020
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29 changes: 29 additions & 0 deletions common/chan.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,29 @@
package common

import "errors"

var ErrStopped = errors.New("stopped")

func Stopped(ch <-chan struct{}) error {
if ch == nil {
return nil
}
select {
case <-ch:
return ErrStopped
default:
}
return nil
}

func SafeClose(ch chan struct{}) {
if ch == nil {
return
}
select {
case <-ch:
// Channel was already closed
default:
close(ch)
}
}