[Tarantool-patches] [PATCH] iproto: stringify IPROTO_RAFT, IPROTO_PROMOTE

[Cyrill Gorcunov via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

This allows `xlog` Lua module to decode appropriate
types into symbolic form.

For example with the patch we should see raft and
promote types in output.

 | $ tarantoolctl cat 00000000000000000004.xlog
 | ---
 | HEADER:
 |   lsn: 2
 |   group_id: 1
 |   type: RAFT
 |   timestamp: 1621541912.4588
 | BODY:
 |   0: 3
 |   1: 4
 | ---
 | HEADER:
 |   lsn: 1
 |   replica_id: 4
 |   type: PROMOTE
 |   timestamp: 1621541912.4592
 | BODY:
 |   2: 0
 |   3: 0
 |   83: 3

Fixes #6088

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---
 .../unreleased/gh-6088-xlog-raft-lua.mg       | 19 +++++++++++++++++++
 src/box/iproto_constants.h                    |  4 ++++
 2 files changed, 23 insertions(+)
 create mode 100644 changelogs/unreleased/gh-6088-xlog-raft-lua.mg

diff --git a/changelogs/unreleased/gh-6088-xlog-raft-lua.mg b/changelogs/unreleased/gh-6088-xlog-raft-lua.mg
new file mode 100644
index 000000000..767cfbd07
--- /dev/null
+++ b/changelogs/unreleased/gh-6088-xlog-raft-lua.mg
@@ -0,0 +1,19 @@
+## bugfix/core
+ * Added decoding of election messages: `RAFT` and `PROMOTE` to
+   `xlog` Lua module (gh-6088). Otherwise `tarantoolctl` shows
+   plain number in `type`
+   ```
+   HEADER:
+     lsn: 1
+     replica_id: 4
+     type: 31
+     timestamp: 1621541912.4592
+   ```
+   instead of symbolic representation
+   ```
+   HEADER:
+     lsn: 1
+     replica_id: 4
+     type: PROMOTE
+     timestamp: 1621541912.4592
+   ```
diff --git a/src/box/iproto_constants.h b/src/box/iproto_constants.h
index 99c8ca184..7362ddaf1 100644
--- a/src/box/iproto_constants.h
+++ b/src/box/iproto_constants.h
@@ -305,6 +305,10 @@ iproto_type_name(uint16_t type)
 		return iproto_type_strs[type];
 
 	switch (type) {
+	case IPROTO_RAFT:
+		return "RAFT";
+	case IPROTO_PROMOTE:
+		return "PROMOTE";
 	case IPROTO_CONFIRM:
 		return "CONFIRM";
 	case IPROTO_ROLLBACK:
-- 
2.31.1