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degesch: begin work on direct introspection

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This commit is contained in:
Přemysl Eric Janouch 2016-10-27 17:03:53 +02:00
parent 7e64fd9886
commit fed8b06aff
Signed by: p
GPG Key ID: B715679E3A361BE6
1 changed files with 176 additions and 30 deletions
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206
degesch.c
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@ -1241,6 +1241,49 @@ weak_unref (struct weak_ref_link **list, struct weak_ref_link **link)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Simple introspection framework to simplify exporting stuff to Lua, since
// there is a lot of it. While not fully automated, at least we have control
// over which fields are exported.
enum ispect_type
{
ISPECT_BOOL,
ISPECT_INT,
ISPECT_UINT,
ISPECT_SIZE,
ISPECT_STRING,
#if 0
// TODO: also str_map, str_vector
ISPECT_REF, ///< Weakly referenced
ISPECT_LIST, ///< Typically copied, depending on type
#endif
};
// TODO: once this finalizes, turn instatiations into macros
struct ispect
{
// TODO:
// - "list" flag?
// - weak_ref/weak_unref methods?
struct ispect_field *fields; ///< Fields
};
struct ispect_field
{
const char *name; ///< Name of the field
size_t offset; ///< Offset in the structure
enum ispect_type type; ///< Type of the field
struct ispect *subtype; ///< Subtype information
};
#define ISPECT(object, field, type) \
{ #field, offsetof (struct object, field), ISPECT_ ## type, NULL },
#define ISPECT_(object, field, type, subtype) \
{ #field, offsetof (struct object, field), ISPECT_ ## type, \
&g_ ## subtype ## _type },
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct user_channel
{
LIST_HEADER (struct user_channel)
@ -1279,6 +1322,18 @@ struct user
struct user_channel *channels; ///< Channels the user is on
};
static struct ispect_field g_user_ispect_fields[] =
{
ISPECT( user, nickname, STRING )
ISPECT( user, away, BOOL )
{}
};
static struct ispect g_user_ispect =
{
.fields = g_user_ispect_fields,
};
static struct user *
user_new (void)
{
@ -1347,6 +1402,20 @@ struct channel
bool left_manually; ///< Don't rejoin on reconnect
};
static struct ispect_field g_channel_ispect_fields[] =
{
ISPECT( channel, name, STRING )
ISPECT( channel, topic, STRING )
ISPECT( channel, users_len, SIZE )
ISPECT( channel, left_manually, BOOL )
{}
};
static struct ispect g_channel_ispect =
{
.fields = g_channel_ispect_fields,
};
static struct channel *
channel_new (void)
{
@ -1519,6 +1588,21 @@ struct buffer
struct user *user; ///< Reference to user
};
static struct ispect_field g_buffer_ispect_fields[] =
{
ISPECT( buffer, name, STRING )
ISPECT( buffer, new_messages_count, UINT )
ISPECT( buffer, new_unimportant_count, UINT )
ISPECT( buffer, highlighted, BOOL )
ISPECT( buffer, hide_unimportant, BOOL )
{}
};
static struct ispect g_buffer_ispect =
{
.fields = g_buffer_ispect_fields,
};
static struct buffer *
buffer_new (struct input *input)
{
@ -1667,6 +1751,23 @@ struct server
unsigned irc_max_modes; ///< Max parametrized modes per command
};
static struct ispect_field g_server_ispect_fields[] =
{
ISPECT( server, name, STRING )
ISPECT( server, state, INT )
ISPECT( server, reconnect_attempt, UINT )
ISPECT( server, manual_disconnect, BOOL )
ISPECT( server, irc_user_host, STRING )
ISPECT( server, autoaway_active, BOOL )
ISPECT( server, cap_echo_message, BOOL )
{}
};
static struct ispect g_server_ispect =
{
.fields = g_server_ispect_fields,
};
static void on_irc_timeout (void *user_data);
static void on_irc_ping_timeout (void *user_data);
static void on_irc_autojoin_timeout (void *user_data);
@ -8418,6 +8519,10 @@ typedef void (*lua_weak_unref_fn) (void *object, struct weak_ref_link **link);
struct lua_weak_info
{
const char *name; ///< Metatable name
struct ispect *ispect; ///< Introspection data
// XXX: not sure if these should be _here_ and not in "struct ispect"
lua_weak_ref_fn ref; ///< Weak link invalidator
lua_weak_unref_fn unref; ///< Weak link generator
};
@ -8425,6 +8530,7 @@ struct lua_weak_info
struct lua_weak
{
struct lua_plugin *plugin; ///< The plugin we belong to
struct lua_weak_info *info; ///< Introspection data
void *object; ///< The object
struct weak_ref_link *weak_ref; ///< A weak reference link
};
@ -8455,6 +8561,7 @@ lua_weak_push (struct lua_plugin *plugin, void *object,
struct lua_weak *wrapper = lua_newuserdata (L, sizeof *wrapper);
luaL_setmetatable (L, info->name);
wrapper->plugin = plugin;
wrapper->info = info;
wrapper->object = object;
wrapper->weak_ref = info->ref (object, lua_weak_invalidate, wrapper);
lua_cache_store (L, object, -1);
@ -8486,9 +8593,10 @@ lua_weak_deref (lua_State *L, const struct lua_weak_info *info)
#define LUA_WEAK_DECLARE(id, metatable_id) \
static struct lua_weak_info lua_ ## id ## _info = \
{ \
.name = metatable_id, \
.ref = (lua_weak_ref_fn) id ## _weak_ref, \
.unref = (lua_weak_unref_fn) id ## _weak_unref, \
.name = metatable_id, \
.ispect = &g_ ## id ## _ispect, \
.ref = (lua_weak_ref_fn) id ## _weak_ref, \
.unref = (lua_weak_unref_fn) id ## _weak_unref, \
};
#define XLUA_USER_METATABLE "user" ///< Identifier for Lua metatable
@ -8509,15 +8617,6 @@ lua_user_gc (lua_State *L)
return lua_weak_gc (L, &lua_user_info);
}
static int
lua_user_get_nickname (lua_State *L)
{
struct lua_weak *wrapper = lua_weak_deref (L, &lua_user_info);
struct user *user = wrapper->object;
lua_pushstring (L, user->nickname);
return 1;
}
static int
lua_user_get_channels (lua_State *L)
{
@ -8537,7 +8636,6 @@ lua_user_get_channels (lua_State *L)
static luaL_Reg lua_user_table[] =
{
{ "__gc", lua_user_gc },
{ "get_nickname", lua_user_get_nickname },
{ "get_channels", lua_user_get_channels },
{ NULL, NULL }
};
@ -8550,15 +8648,6 @@ lua_channel_gc (lua_State *L)
return lua_weak_gc (L, &lua_channel_info);
}
static int
lua_channel_get_name (lua_State *L)
{
struct lua_weak *wrapper = lua_weak_deref (L, &lua_channel_info);
struct channel *channel = wrapper->object;
lua_pushstring (L, channel->name);
return 1;
}
static int
lua_channel_get_users (lua_State *L)
{
@ -8582,7 +8671,6 @@ lua_channel_get_users (lua_State *L)
static luaL_Reg lua_channel_table[] =
{
{ "__gc", lua_channel_gc },
{ "get_name", lua_channel_get_name },
{ "get_users", lua_channel_get_users },
{ NULL, NULL }
};
@ -8645,7 +8733,6 @@ lua_buffer_execute (lua_State *L)
static luaL_Reg lua_buffer_table[] =
{
// TODO: some useful methods or values
{ "__gc", lua_buffer_gc },
{ "get_user", lua_buffer_get_user },
{ "get_channel", lua_buffer_get_channel },
@ -8692,7 +8779,6 @@ lua_server_send (lua_State *L)
static luaL_Reg lua_server_table[] =
{
// TODO: some useful methods or values
{ "__gc", lua_server_gc },
{ "get_user", lua_server_get_user },
{ "get_buffer", lua_server_get_buffer },
@ -9701,6 +9787,16 @@ static luaL_Reg lua_plugin_library[] =
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static struct lua_ispect_mapping
{
struct ispect *ispect; ///< Type info
struct lua_weak_info *info; ///< Lua-specific additions
}
lua_types[] =
{
{ &g_buffer_ispect, &lua_buffer_info },
};
static void *
lua_plugin_alloc (void *ud, void *ptr, size_t o_size, size_t n_size)
{
@ -9724,6 +9820,35 @@ lua_plugin_panic (lua_State *L)
return 0;
}
static bool
lua_plugin_property_get_ispect (lua_State *L, const char *property_name)
{
struct lua_weak_info *info = lua_touserdata (L, lua_upvalueindex (1));
if (!info || !info->ispect)
return false;
struct lua_weak *weak = luaL_checkudata (L, 1, info->name);
// TODO: I think we can do better than this, maybe binary search at least?
struct ispect_field *iter;
for (iter = info->ispect->fields; iter->name; iter++)
if (!strcmp (property_name, iter->name))
break;
if (iter->name)
{
void *p = (uint8_t *) weak->object + iter->offset;
switch (iter->type)
{
case ISPECT_BOOL: lua_pushboolean (L, *(bool *) p); return true;
case ISPECT_INT: lua_pushinteger (L, *(int *) p); return true;
case ISPECT_UINT: lua_pushinteger (L, *(unsigned *) p); return true;
case ISPECT_SIZE: lua_pushinteger (L, *(size_t *) p); return true;
case ISPECT_STRING: lua_pushstring (L, *(char **) p); return true;
}
}
return false;
}
static int
lua_plugin_property_get (lua_State *L)
{
@ -9746,6 +9871,10 @@ lua_plugin_property_get (lua_State *L)
return 1;
}
// Maybe we can find it via introspection
if (lua_plugin_property_get_ispect (L, property_name))
return 1;
// Or we look for a property set by the user (__gc cannot be overriden)
if (lua_getuservalue (L, 1) != LUA_TTABLE)
lua_pushnil (L);
@ -9787,7 +9916,24 @@ lua_plugin_create_meta (lua_State *L, const char *name, luaL_Reg *fns)
luaL_setfuncs (L, fns, 0);
// Emulate properties for convenience
lua_pushcfunction (L, lua_plugin_property_get);
lua_pushlightuserdata (L, NULL);
lua_pushcclosure (L, lua_plugin_property_get, 1);
lua_setfield (L, -2, "__index");
lua_pushcfunction (L, lua_plugin_property_set);
lua_setfield (L, -2, "__newindex");
lua_pop (L, 1);
}
static void
lua_plugin_create_weak (lua_State *L, struct lua_weak_info *info, luaL_Reg *fns)
{
luaL_newmetatable (L, info->name);
luaL_setfuncs (L, fns, 0);
// Emulate properties for convenience
lua_pushlightuserdata (L, info);
lua_pushcclosure (L, lua_plugin_property_get, 1);
lua_setfield (L, -2, "__index");
lua_pushcfunction (L, lua_plugin_property_set);
lua_setfield (L, -2, "__newindex");
@ -9824,10 +9970,10 @@ lua_plugin_load (struct app_context *ctx, const char *filename,
// Create metatables for our objects
lua_plugin_create_meta (L, XLUA_HOOK_METATABLE, lua_hook_table);
lua_plugin_create_meta (L, XLUA_USER_METATABLE, lua_user_table);
lua_plugin_create_meta (L, XLUA_CHANNEL_METATABLE, lua_channel_table);
lua_plugin_create_meta (L, XLUA_BUFFER_METATABLE, lua_buffer_table);
lua_plugin_create_meta (L, XLUA_SERVER_METATABLE, lua_server_table);
lua_plugin_create_weak (L, &lua_user_info, lua_user_table);
lua_plugin_create_weak (L, &lua_channel_info, lua_channel_table);
lua_plugin_create_weak (L, &lua_buffer_info, lua_buffer_table);
lua_plugin_create_weak (L, &lua_server_info, lua_server_table);
lua_plugin_create_meta (L, XLUA_SCHEMA_METATABLE, lua_schema_table);
lua_plugin_create_meta (L, XLUA_CONNECTION_METATABLE, lua_connection_table);
lua_plugin_create_meta (L, XLUA_CONNECTOR_METATABLE, lua_connector_table);