sync+p2p: remove closer (#7805)

internal/libs/sync/closer.go

@@ -1,31 +0,0 @@
-package sync
-
-import "sync"
-
-// Closer implements a primitive to close a channel that signals process
-// termination while allowing a caller to call Close multiple times safely. It
-// should be used in cases where guarantees cannot be made about when and how
-// many times closure is executed.
-type Closer struct {
-	closeOnce sync.Once
-	doneCh    chan struct{}
-}
-
-// NewCloser returns a reference to a new Closer.
-func NewCloser() *Closer {
-	return &Closer{doneCh: make(chan struct{})}
-}
-
-// Done returns the internal done channel allowing the caller either block or wait
-// for the Closer to be terminated/closed.
-func (c *Closer) Done() <-chan struct{} {
-	return c.doneCh
-}
-
-// Close gracefully closes the Closer. A caller should only call Close once, but
-// it is safe to call it successive times.
-func (c *Closer) Close() {
-	c.closeOnce.Do(func() {
-		close(c.doneCh)
-	})
-}

internal/libs/sync/closer_test.go

@@ -1,28 +0,0 @@
-package sync_test
-
-import (
-	"testing"
-	"time"
-
-	"github.com/stretchr/testify/require"
-	tmsync "github.com/tendermint/tendermint/internal/libs/sync"
-)
-
-func TestCloser(t *testing.T) {
-	closer := tmsync.NewCloser()
-
-	var timeout bool
-
-	select {
-	case <-closer.Done():
-	case <-time.After(time.Second):
-		timeout = true
-	}
-
-	for i := 0; i < 10; i++ {
-		closer.Close()
-	}
-
-	require.True(t, timeout)
-	<-closer.Done()
-}