From 16101b7d84cebf35e855ba0e30ab6d7d552e2385 Mon Sep 17 00:00:00 2001
From: Evgeniy Kulikov <kim@nspcc.ru>
Date: Thu, 21 Nov 2019 15:13:07 +0300
Subject: [PATCH] proto: add version of protocol into meta header

---
 service/meta.go    | 12 +++++++++++-
 service/meta.proto |  5 +++--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/service/meta.go b/service/meta.go
index 52874c1..1e3fcc8 100644
--- a/service/meta.go
+++ b/service/meta.go
@@ -10,6 +10,7 @@ type (
 	// MetaHeader contains meta information of request.
 	// It provides methods to get or set meta information meta header.
 	// Also contains methods to reset and restore meta header.
+	// Also contains methods to get or set request protocol version
 	MetaHeader interface {
 		ResetMeta() RequestMetaHeader
 		RestoreMeta(RequestMetaHeader)
@@ -20,7 +21,16 @@ type (
 
 		// EpochRequest gives possibility to get or set epoch in RPC Requests.
 		GetEpoch() uint64
-		SetEpoch(v uint64)
+		SetEpoch(uint64)
+
+		// VersionHeader allows get or set version of protocol request
+		VersionHeader
+	}
+
+	// VersionHeader allows get or set version of protocol request
+	VersionHeader interface {
+		GetVersion() uint32
+		SetVersion(uint32)
 	}
 
 	// TTLCondition is closure, that allows to validate request with ttl.
diff --git a/service/meta.proto b/service/meta.proto
index 4c09fb3..62866d2 100644
--- a/service/meta.proto
+++ b/service/meta.proto
@@ -7,6 +7,7 @@ import "github.com/gogo/protobuf/gogoproto/gogo.proto";
 option (gogoproto.stable_marshaler_all) = true;
 
 message RequestMetaHeader {
-    uint32 TTL   = 1;
-    uint64 Epoch = 2;
+    uint32 TTL     = 1;
+    uint64 Epoch   = 2;
+    uint32 Version = 3;
 }