initial import

core/contextx/deadline.go

@@ -0,0 +1,17 @@
+package contextx
+
+import (
+	"context"
+	"time"
+)
+
+func ShrinkDeadline(ctx context.Context, timeout time.Duration) (context.Context, func()) {
+	if deadline, ok := ctx.Deadline(); ok {
+		leftTime := time.Until(deadline)
+		if leftTime < timeout {
+			timeout = leftTime
+		}
+	}
+
+	return context.WithDeadline(ctx, time.Now().Add(timeout))
+}