lua: don't use public module name as internal one

There are modules that are implemented as two parts: a Lua/C module for
internal use and a public module written on Lua. There is a practice to
name both parts the same: just capture the internal part within the
public part and rewrite `package.loaded` then.

This name overlap is confusing at reading the sources and complicates
debugging. And it conflicts with a built-in module loading logic that
will be implemented for tarantool#7774.

Let's use `foo.lib` for the internal part and `foo` for the public one.
This approach is already used in some built-in modules.

src/box/lua/upgrade.lua requires src/box/lua/xlog.lua, so changed the
loading order.

Eliminated extra `internal` field in `uri.lib`, because the whole module
is internal.

Part of tarantool#7774

NO_DOC=user visible behavior is unchanged, pure refactoring change
NO_TEST=see NO_DOC
NO_CHANGELOG=see NO_DOC

src/box/lua/console.c

@@ -883,7 +883,7 @@ tarantool_lua_console_init(struct lua_State *L)
 		{"run_on_eval",		lbox_console_run_on_eval},
 		{NULL, NULL}
 	};
-	luaT_newmodule(L, "console", consolelib);
+	luaT_newmodule(L, "console.lib", consolelib);
 
 	/* readline() func needs a ref to completion_handler (in upvalue) */
 	lua_getfield(L, -1, "completion_handler");

src/box/lua/console.lua

@@ -17,7 +17,7 @@ ffi.cdef[[
     console_set_output_format(enum output_format output_format);
 ]]
 
-local internal = require('console')
+local internal = require('console.lib')
 local session_internal = box.internal.session
 local fiber = require('fiber')
 local socket = require('socket')

src/box/lua/init.c

@@ -159,11 +159,11 @@ static const char *lua_sources[] = {
 #if ENABLE_SECURITY
 	"box/security", security_lua,
 #endif
+	"box/xlog", xlog_lua,
 	"box/upgrade", upgrade_lua,
 	"box/net_box", net_box_lua,
 	"box/console", console_lua,
 	"box/load_cfg", load_cfg_lua,
-	"box/xlog", xlog_lua,
 	"box/key_def", key_def_lua,
 	"box/merger", merger_lua,
 	NULL

src/box/lua/xlog.c

@@ -47,7 +47,6 @@
 /* {{{ Helpers */
 
 static uint32_t CTID_STRUCT_XLOG_CURSOR_REF = 0;
-static const char *xloglib_name = "xlog";
 
 static int
 lbox_pushcursor(struct lua_State *L, struct xlog_cursor *cur)
@@ -328,7 +327,7 @@ box_lua_xlog_init(struct lua_State *L)
 	CTID_STRUCT_XLOG_CURSOR_REF = luaL_ctypeid(L, "struct xlog_cursor&");
 	assert(CTID_STRUCT_XLOG_CURSOR_REF != 0);
 
-	luaT_newmodule(L, xloglib_name, lbox_xlog_parser_lib);
+	luaT_newmodule(L, "xlog.lib", lbox_xlog_parser_lib);
 
 	lua_newtable(L);
 	lua_setmetatable(L, -2);

src/box/lua/xlog.lua

@@ -1,4 +1,4 @@
-local internal = require('xlog')
+local internal = require('xlog.lib')
 local fun = require('fun')
 local function xlog_pairs(...)
     return fun.wrap(internal.pairs(...))

src/lua/digest.c

@@ -163,6 +163,6 @@ tarantool_lua_digest_init(struct lua_State *L)
 	lua_pushcfunction(L, luaopen_crc32_internal);
 	lua_setfield(L, -2, "crc32.internal");
 	lua_pop(L, 1);
-	luaT_newmodule(L, "digest", lua_digest_methods);
+	luaT_newmodule(L, "digest.lib", lua_digest_methods);
 	lua_pop(L, 1);
 };

src/lua/digest.lua

@@ -90,7 +90,7 @@ local digest_shortcuts = {
     md5     = 'MD5',
     md4     = 'MD4',
 }
-local internal = require("digest")
+local internal = require("digest.lib")
 
 local PMurHash
 local PMurHash_methods = {

src/lua/errno.c

@@ -286,7 +286,7 @@ tarantool_lua_errno_init(struct lua_State *L)
 	static const luaL_Reg errnolib[] = {
 		{ NULL, NULL}
 	};
-	luaT_newmodule(L, "errno", errnolib);
+	luaT_newmodule(L, "errno.lib", errnolib);
 	for (int i = 0; i < (int)lengthof(elist); i++) {
 		lua_pushstring(L, elist[i].name);
 		lua_pushinteger(L, elist[i].value);

src/lua/errno.lua

@@ -1,5 +1,5 @@
 local ffi = require('ffi')
-local errno_list = require('errno')
+local errno_list = require('errno.lib')
 
 ffi.cdef[[
     const char *tt_strerror(int errnum);

src/lua/httpc.c

@@ -452,6 +452,6 @@ LUA_API int
 luaopen_http_client_driver(lua_State *L)
 {
 	luaL_register_type(L, DRIVER_LUA_UDATA_NAME, Client);
-	luaT_newmodule(L, "http.client", Module);
+	luaT_newmodule(L, "http.client.lib", Module);
 	return 1;
 }

src/lua/httpc.lua

@@ -29,7 +29,7 @@
 --  SUCH DAMAGE.
 --
 
-local driver = require('http.client')
+local driver = require('http.client.lib')
 
 local json = require('json')
 local yaml = require('yaml')

src/lua/socket.c

@@ -1035,7 +1035,7 @@ tarantool_lua_socket_init(struct lua_State *L)
 		{ NULL,			NULL			}
 	};
 
-	luaT_newmodule(L, "socket", internal_methods);
+	luaT_newmodule(L, "socket.lib", internal_methods);
 
 	/* domains table */
 	lua_pushliteral(L, "DOMAIN");

src/lua/socket.lua

@@ -5,7 +5,7 @@ local LIMIT_INFINITY = 2147483647
 
 local ffi = require('ffi')
 local boxerrno = require('errno')
-local internal = require('socket')
+local internal = require('socket.lib')
 local fiber = require('fiber')
 local fio = require('fio')
 local log = require('log')

src/lua/swim.c

@@ -117,6 +117,6 @@ tarantool_lua_swim_init(struct lua_State *L)
 		{"swim_on_member_event", lua_swim_on_member_event},
 		{NULL, NULL}
 	};
-	luaT_newmodule(L, "swim", lua_swim_internal_methods);
+	luaT_newmodule(L, "swim.lib", lua_swim_internal_methods);
 	lua_pop(L, 1);
 }

src/lua/swim.lua

@@ -4,7 +4,7 @@ local buffer = require('buffer')
 local msgpack = require('msgpack')
 local crypto = require('crypto')
 local fiber = require('fiber')
-local internal = require('swim')
+local internal = require('swim.lib')
 local schedule_task = fiber._internal.schedule_task
 local cord_ibuf_take = buffer.internal.cord_ibuf_take
 local cord_ibuf_put = buffer.internal.cord_ibuf_put

src/lua/uri.c

@@ -301,7 +301,7 @@ luaT_uri_create_internal(lua_State *L)
 {
 	struct uri *uri = (struct uri *)lua_topointer(L, 1);
 	if (uri == NULL)
-		luaL_error(L, "Usage: uri.internal.uri_create(string|table)");
+		luaL_error(L, "Usage: uri_lib.uri_create(string|table)");
 	if (luaT_uri_create(L, 2, uri) != 0)
 		luaT_error(L);
 	return 0;
@@ -312,7 +312,7 @@ luaT_uri_set_create_internal(lua_State *L)
 {
 	struct uri_set *uri_set = (struct uri_set *)lua_topointer(L, 1);
 	if (uri_set == NULL)
-		luaL_error(L, "Usage: uri.internal.uri_set_create(string|table)");
+		luaL_error(L, "Usage: uri_lib.uri_set_create(string|table)");
 	if (luaT_uri_set_create(L, 2, uri_set) != 0)
 		luaT_error(L);
 	return 0;
@@ -321,21 +321,12 @@ luaT_uri_set_create_internal(lua_State *L)
 void
 tarantool_lua_uri_init(struct lua_State *L)
 {
-	static const struct luaL_Reg uri_methods[] = {
-		{NULL, NULL}
-	};
-	luaT_newmodule(L, "uri", uri_methods);
-
 	/* internal table */
-	lua_pushliteral(L, "internal");
-	lua_newtable(L);
-	static const struct luaL_Reg uri_internal_methods[] = {
+	static const struct luaL_Reg uri_methods[] = {
 		{"uri_create", luaT_uri_create_internal},
 		{"uri_set_create", luaT_uri_set_create_internal},
 		{NULL, NULL}
 	};
-	luaT_setfuncs(L, uri_internal_methods);
-	lua_settable(L, -3);
-
+	luaT_newmodule(L, "uri.lib", uri_methods);
 	lua_pop(L, 1);
 };

src/lua/uri.lua

@@ -2,7 +2,7 @@
 
 local ffi = require('ffi')
 local buffer = require('buffer')
-local uri = require('uri')
+local internal = require('uri.lib')
 
 local uri_cdef = [[
 struct uri_param {
@@ -165,7 +165,7 @@ local function parse(str)
         error("Usage: uri.parse(string|table)")
     end
     local uribuf = uri_stash_take()
-    local status, errmsg = pcall(uri.internal.uri_create, uribuf, str)
+    local status, errmsg = pcall(internal.uri_create, uribuf, str)
     if not status then
         uri_stash_put(uribuf)
         return nil, errmsg
@@ -181,7 +181,7 @@ local function parse_many(str)
         error("Usage: uri.parse_many(string|table)")
     end
     local uri_set_buf = uri_set_stash_take()
-    local status, errmsg = pcall(uri.internal.uri_set_create, uri_set_buf, str)
+    local status, errmsg = pcall(internal.uri_set_create, uri_set_buf, str)
     if not status then
         uri_set_stash_put(uri_set_buf)
         return nil, errmsg