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From: Vladislav Shpilevoy via Tarantool-patches <tarantool-patches@dev.tarantool.org>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: tml <tarantool-patches@dev.tarantool.org>
Subject: Re: [Tarantool-patches] [PATCH v20 6/7] box: implement box.lib module
Date: Wed, 7 Apr 2021 22:28:09 +0200	[thread overview]
Message-ID: <02f89e4e-70ff-215f-7cc4-3331adbb3c94@tarantool.org> (raw)
In-Reply-To: <YG4UfcyTi2T9Bys8@grain>

On 07.04.2021 22:22, Cyrill Gorcunov wrote:
> On Wed, Apr 07, 2021 at 07:59:35PM +0300, Cyrill Gorcunov wrote:
>>>> +/** Handle __index request for a module object. */
>>>> +static int
>>>> +lbox_module_index(struct lua_State *L)
>>>> +{
>>>> +	lua_getmetatable(L, 1);
>>>> +	lua_pushvalue(L, 2);
>>>> +	lua_rawget(L, -2);
>>>> +	if (!lua_isnil(L, -1))
>>>> +		return 1;
>>>
>>> 6. What is happening here in these 5 lines?
>>
>> Actually this snippet comes from popen code where
>> we have wrappers on lua level and test for metamethods.
>> While it doesn't hurt it makes no much sense in current
>> code, thanks! Will drop.
> 
> Heh, in real we need these to handle metamethods such as
> "module:load". I added a comment into the code.

For methods you need to use the metatype. It is defined as
luaL_register_type(), where you can add methods, not just
__index. The latter is more for, well, indexing. Getting an
attribute, for example. See an example in lua/popen.c.

Methods should not end up in __index.

  reply	other threads:[~2021-04-07 20:28 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-02 12:34 [Tarantool-patches] [PATCH v20 0/7] box: implement box.lib Lua module Cyrill Gorcunov via Tarantool-patches
2021-04-02 12:34 ` [Tarantool-patches] [PATCH v20 1/7] box/schema: make sure hashes are created Cyrill Gorcunov via Tarantool-patches
2021-04-05  9:28   ` Serge Petrenko via Tarantool-patches
2021-04-05  9:50     ` Cyrill Gorcunov via Tarantool-patches
2021-04-05 10:13       ` Serge Petrenko via Tarantool-patches
2021-04-05 15:45   ` Vladislav Shpilevoy via Tarantool-patches
2021-04-06  7:44     ` Cyrill Gorcunov via Tarantool-patches
2021-04-02 12:34 ` [Tarantool-patches] [PATCH v20 2/7] box/func: module_reload -- drop redundant argument Cyrill Gorcunov via Tarantool-patches
2021-04-05 10:23   ` Serge Petrenko via Tarantool-patches
2021-04-05 10:26     ` Serge Petrenko via Tarantool-patches
2021-04-05 10:31       ` Cyrill Gorcunov via Tarantool-patches
2021-04-02 12:34 ` [Tarantool-patches] [PATCH v20 3/7] box/func: fix modules functions restore Cyrill Gorcunov via Tarantool-patches
2021-04-05 10:53   ` Serge Petrenko via Tarantool-patches
2021-04-05 11:26     ` Cyrill Gorcunov via Tarantool-patches
2021-04-05 11:42       ` Serge Petrenko via Tarantool-patches
2021-04-05 15:47   ` Vladislav Shpilevoy via Tarantool-patches
2021-04-06  8:38     ` Cyrill Gorcunov via Tarantool-patches
2021-04-06 20:02       ` Vladislav Shpilevoy via Tarantool-patches
2021-04-06 20:42         ` Cyrill Gorcunov via Tarantool-patches
2021-04-02 12:34 ` [Tarantool-patches] [PATCH v20 4/7] box/module_cache: introduce modules subsystem Cyrill Gorcunov via Tarantool-patches
2021-04-05 12:34   ` Serge Petrenko via Tarantool-patches
2021-04-05 15:52   ` Vladislav Shpilevoy via Tarantool-patches
2021-04-06 14:33     ` Cyrill Gorcunov via Tarantool-patches
2021-04-06 20:09       ` Vladislav Shpilevoy via Tarantool-patches
2021-04-06 22:05         ` Cyrill Gorcunov via Tarantool-patches
2021-04-06 23:43           ` Vladislav Shpilevoy via Tarantool-patches
2021-04-07  7:03             ` Cyrill Gorcunov via Tarantool-patches
2021-04-02 12:34 ` [Tarantool-patches] [PATCH v20 5/7] box/schema.func: switch to new module api Cyrill Gorcunov via Tarantool-patches
2021-04-05 15:56   ` Vladislav Shpilevoy via Tarantool-patches
2021-04-02 12:34 ` [Tarantool-patches] [PATCH v20 6/7] box: implement box.lib module Cyrill Gorcunov via Tarantool-patches
2021-04-05 16:04   ` Vladislav Shpilevoy via Tarantool-patches
2021-04-07 16:59     ` Cyrill Gorcunov via Tarantool-patches
2021-04-07 20:22       ` Cyrill Gorcunov via Tarantool-patches
2021-04-07 20:28         ` Vladislav Shpilevoy via Tarantool-patches [this message]
2021-04-07 20:37           ` Cyrill Gorcunov via Tarantool-patches
2021-04-07 20:45             ` Cyrill Gorcunov via Tarantool-patches
2021-04-07 21:04               ` Vladislav Shpilevoy via Tarantool-patches
2021-04-02 12:34 ` [Tarantool-patches] [PATCH v20 7/7] test: add box.lib test Cyrill Gorcunov via Tarantool-patches
2021-04-05 16:04   ` Vladislav Shpilevoy via Tarantool-patches
2021-04-05 15:45 ` [Tarantool-patches] [PATCH v20 0/7] box: implement box.lib Lua module Vladislav Shpilevoy via Tarantool-patches

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