Initial QSfera import

Server/vendor/github.com/segmentio/kafka-go/protocol/roundtrip.go

@@ -0,0 +1,28 @@
+package protocol
+
+import (
+	"io"
+)
+
+// RoundTrip sends a request to a kafka broker and returns the response.
+func RoundTrip(rw io.ReadWriter, apiVersion int16, correlationID int32, clientID string, req Message) (Message, error) {
+	if err := WriteRequest(rw, apiVersion, correlationID, clientID, req); err != nil {
+		return nil, err
+	}
+	if !hasResponse(req) {
+		return nil, nil
+	}
+	id, res, err := ReadResponse(rw, req.ApiKey(), apiVersion)
+	if err != nil {
+		return nil, err
+	}
+	if id != correlationID {
+		return nil, Errorf("correlation id mismatch (expected=%d, found=%d)", correlationID, id)
+	}
+	return res, nil
+}
+
+func hasResponse(msg Message) bool {
+	x, _ := msg.(interface{ HasResponse() bool })
+	return x == nil || x.HasResponse()
+}