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vendor/github.com/jackc/pgx/v5/pgconn/internal/ctxwatch/context_watcher.go

@@ -1,73 +0,0 @@
-package ctxwatch
-
-import (
-	"context"
-	"sync"
-)
-
-// ContextWatcher watches a context and performs an action when the context is canceled. It can watch one context at a
-// time.
-type ContextWatcher struct {
-	onCancel             func()
-	onUnwatchAfterCancel func()
-	unwatchChan          chan struct{}
-
-	lock              sync.Mutex
-	watchInProgress   bool
-	onCancelWasCalled bool
-}
-
-// NewContextWatcher returns a ContextWatcher. onCancel will be called when a watched context is canceled.
-// OnUnwatchAfterCancel will be called when Unwatch is called and the watched context had already been canceled and
-// onCancel called.
-func NewContextWatcher(onCancel func(), onUnwatchAfterCancel func()) *ContextWatcher {
-	cw := &ContextWatcher{
-		onCancel:             onCancel,
-		onUnwatchAfterCancel: onUnwatchAfterCancel,
-		unwatchChan:          make(chan struct{}),
-	}
-
-	return cw
-}
-
-// Watch starts watching ctx. If ctx is canceled then the onCancel function passed to NewContextWatcher will be called.
-func (cw *ContextWatcher) Watch(ctx context.Context) {
-	cw.lock.Lock()
-	defer cw.lock.Unlock()
-
-	if cw.watchInProgress {
-		panic("Watch already in progress")
-	}
-
-	cw.onCancelWasCalled = false
-
-	if ctx.Done() != nil {
-		cw.watchInProgress = true
-		go func() {
-			select {
-			case <-ctx.Done():
-				cw.onCancel()
-				cw.onCancelWasCalled = true
-				<-cw.unwatchChan
-			case <-cw.unwatchChan:
-			}
-		}()
-	} else {
-		cw.watchInProgress = false
-	}
-}
-
-// Unwatch stops watching the previously watched context. If the onCancel function passed to NewContextWatcher was
-// called then onUnwatchAfterCancel will also be called.
-func (cw *ContextWatcher) Unwatch() {
-	cw.lock.Lock()
-	defer cw.lock.Unlock()
-
-	if cw.watchInProgress {
-		cw.unwatchChan <- struct{}{}
-		if cw.onCancelWasCalled {
-			cw.onUnwatchAfterCancel()
-		}
-		cw.watchInProgress = false
-	}
-}