[Tarantool-patches] [PATCH v2 10/10] raft: introduce box.info.raft

[Vladislav Shpilevoy <v.shpilevoy@tarantool.org>]

Box.info.raft returns a table of form:

    {
        state: <string>,
        term: <number>,
        vote: <instance ID>,
        leader: <instance ID>
    }

The fields correspond to the same named Raft concepts one to one.
This info dump is supposed to help with the tests, first of all.
And with investigation of problems in a real cluster.

Part of #1146
---
 src/box/lua/info.c   | 17 +++++++++++++++++
 test/box/info.result |  1 +
 2 files changed, 18 insertions(+)

diff --git a/src/box/lua/info.c b/src/box/lua/info.c
index 1c131caec..8e1dbd497 100644
--- a/src/box/lua/info.c
+++ b/src/box/lua/info.c
@@ -49,6 +49,7 @@
 #include "main.h"
 #include "version.h"
 #include "box/box.h"
+#include "box/raft.h"
 #include "lua/utils.h"
 #include "fiber.h"
 #include "tt_static.h"
@@ -577,6 +578,21 @@ lbox_info_listen(struct lua_State *L)
 	return 1;
 }
 
+static int
+lbox_info_raft(struct lua_State *L)
+{
+	lua_createtable(L, 0, 4);
+	lua_pushstring(L, raft_state_strs[raft.state]);
+	lua_setfield(L, -2, "state");
+	luaL_pushuint64(L, raft.volatile_term);
+	lua_setfield(L, -2, "term");
+	lua_pushinteger(L, raft.volatile_vote);
+	lua_setfield(L, -2, "vote");
+	lua_pushinteger(L, raft.leader);
+	lua_setfield(L, -2, "leader");
+	return 1;
+}
+
 static const struct luaL_Reg lbox_info_dynamic_meta[] = {
 	{"id", lbox_info_id},
 	{"uuid", lbox_info_uuid},
@@ -595,6 +611,7 @@ static const struct luaL_Reg lbox_info_dynamic_meta[] = {
 	{"vinyl", lbox_info_vinyl},
 	{"sql", lbox_info_sql},
 	{"listen", lbox_info_listen},
+	{"raft", lbox_info_raft},
 	{NULL, NULL}
 };
 
diff --git a/test/box/info.result b/test/box/info.result
index 40eeae069..d0abb634a 100644
--- a/test/box/info.result
+++ b/test/box/info.result
@@ -82,6 +82,7 @@ t
   - memory
   - package
   - pid
+  - raft
   - replication
   - replication_anon
   - ro
-- 
2.21.1 (Apple Git-122.3)