[Tarantool-patches] [PATCH v2] box: frommap() bug fix

[Chris Sosnin <k.sosnin@tarantool.org>]

Thank you for the review!
Fixed version below.
branch: https://github.com/tarantool/tarantool/tree/ksosnin/gh-4262-frommap-error-handle
issue: https://github.com/tarantool/tarantool/issues/4262

- If an optional argument is provided for
  space_object:frommap() (which is {table = true|false}),
  type match for first arguments is omitted, which is
  incorrect. We should return the result only after making
  sure it is possible to build a tuple.

- If there is a type mismatch, however, frommap() does not
  return nil, err as it is mentioned in the description, so we
  change it to be this way.

Closes #4262
---
 src/box/lua/space.cc    | 13 +++++++++----
 test/box/tuple.result   |  8 +++++++-
 test/box/tuple.test.lua |  1 +
 3 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/src/box/lua/space.cc b/src/box/lua/space.cc
index f6e96f0c0..e772a924d 100644
--- a/src/box/lua/space.cc
+++ b/src/box/lua/space.cc
@@ -580,14 +580,19 @@ lbox_space_frommap(struct lua_State *L)
 		}
 		lua_rawseti(L, -3, fieldno+1);
 	}
-	if (table)
-		return 1;

 	lua_replace(L, 1);
 	lua_settop(L, 1);
 	tuple = luaT_tuple_new(L, -1, space->format);
-	if (tuple == NULL)
-		return luaT_error(L);
+	if (tuple == NULL) {
+		struct error *e = diag_last_error(&fiber()->diag);
+		lua_pushnil(L);
+		lua_pushstring(L, e->errmsg);
+		return 2;
+	}
+	if (table) {
+		return 1;
+	}
 	luaT_pushtuple(L, tuple);
 	return 1;
 usage_error:
diff --git a/test/box/tuple.result b/test/box/tuple.result
index 9140211b7..78f919deb 100644
--- a/test/box/tuple.result
+++ b/test/box/tuple.result
@@ -1121,7 +1121,13 @@ s:frommap()
 ...
 s:frommap({})
 ---
-- error: Tuple field 1 required by space format is missing
+- null
+- Tuple field 1 required by space format is missing
+...
+s:frommap({ddd = 'fail', aaa = 2, ccc = 3, bbb = 4}, {table=true})
+---
+- null
+- 'Tuple field 4 type does not match one required by operation: expected unsigned'
 ...
 s:frommap({ddd = 1, aaa = 2, ccc = 3, bbb = 4}, {table = true})
 ---
diff --git a/test/box/tuple.test.lua b/test/box/tuple.test.lua
index 3ac2902fe..baf2f22d5 100644
--- a/test/box/tuple.test.lua
+++ b/test/box/tuple.test.lua
@@ -373,6 +373,7 @@ s:frommap({ddd = 1, aaa = 2, bbb = 3})
 s:frommap({ddd = 1, aaa = 2, ccc = 3, eee = 4})
 s:frommap()
 s:frommap({})
+s:frommap({ddd = 'fail', aaa = 2, ccc = 3, bbb = 4}, {table=true})
 s:frommap({ddd = 1, aaa = 2, ccc = 3, bbb = 4}, {table = true})
 s:frommap({ddd = 1, aaa = 2, ccc = 3, bbb = 4}, {table = false})
 s:frommap({ddd = 1, aaa = 2, ccc = 3, bbb = box.NULL})
--
2.21.0 (Apple Git-122.2)