feat: kubernetes basic integration

internal/lock/memory/locker.go

@@ -0,0 +1,45 @@
+package memory
+
+import (
+	"context"
+	"time"
+
+	"forge.cadoles.com/cadoles/bouncer/internal/lock"
+	"github.com/pkg/errors"
+)
+
+var (
+	ErrTimeout = errors.New("timeout")
+)
+
+type Locker struct {
+	lock chan struct{}
+}
+
+// WithLock implements lock.Locker.
+func (l *Locker) WithLock(ctx context.Context, key string, timeout time.Duration, fn func(ctx context.Context) error) error {
+	select {
+	case l.lock <- struct{}{}:
+		defer func() {
+			<-l.lock
+		}()
+		if err := fn(ctx); err != nil {
+			return errors.WithStack(err)
+		}
+	case <-ctx.Done():
+		return errors.WithStack(ctx.Err())
+
+	case <-time.After(timeout):
+		return errors.WithStack(ErrTimeout)
+	}
+
+	return nil
+}
+
+func NewLocker() *Locker {
+	return &Locker{
+		lock: make(chan struct{}, 1),
+	}
+}
+
+var _ lock.Locker = &Locker{}