Merge pull request #17177 from amit-rastogi/release-3.5

Backport testutils.ExecuteUntil to 3.5 branch

tests/framework/testutils/execute.go

@@ -0,0 +1,44 @@
+// Copyright 2022 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package testutils
+
+import (
+	"context"
+	"fmt"
+	"testing"
+	"time"
+
+	"go.etcd.io/etcd/client/pkg/v3/testutil"
+)
+
+func ExecuteUntil(ctx context.Context, t *testing.T, f func()) {
+	deadline, deadlineSet := ctx.Deadline()
+	timeout := time.Until(deadline)
+	donec := make(chan struct{})
+	go func() {
+		defer close(donec)
+		f()
+	}()
+
+	select {
+	case <-ctx.Done():
+		msg := ctx.Err().Error()
+		if deadlineSet {
+			msg = fmt.Sprintf("test timed out after %v, err: %v", timeout, msg)
+		}
+		testutil.FatalStack(t, msg)
+	case <-donec:
+	}
+}