use plain pkg module

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

pkg/checks/checktcp.go

@@ -0,0 +1,31 @@
+package checks
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/opencloud-eu/opencloud/pkg/handlers"
+)
+
+// NewTCPCheck returns a check that connects to a given tcp endpoint.
+func NewTCPCheck(address string) func(context.Context) error {
+	return func(_ context.Context) error {
+		address, err := handlers.FailSaveAddress(address)
+		if err != nil {
+			return err
+		}
+
+		conn, err := net.DialTimeout("tcp", address, 3*time.Second)
+		if err != nil {
+			return err
+		}
+
+		err = conn.Close()
+		if err != nil {
+			return err
+		}
+
+		return nil
+	}
+}