async mapgen

[BuckarooBanzay]

@LoneWolfHT (i think you asked about this on discord)

Async mapgen won't work with the mapsync mod because of the missing core.get_meta function. Mapsync deserializes map metadata (inventories, timers, etc) in the main mapgen thread.
Separating map-deserializing and metadata-deserializing in separate environments (sync/async) sounds like asking for trouble (race-conditions, mainly) IMO

Docs: https://github.com/luanti-org/luanti/blob/master/doc/lua_api.md#async-environment

The async environment does not have access to the map, entities, players or any globals defined in the 'usual' environment.

Well, i tried, sounded too good to be true anyway :/

mtt-1  | 2025-05-22 05:34:13: ERROR[Main]: ServerError: AsyncErr: Lua: Runtime error from mod 'mapsync' in callback on_generated(): /github/workspace/deserialize_mapblock.lua:26: attempt to call field 'get_meta' (a nil value)
mtt-1  | 2025-05-22 05:34:13: ERROR[Main]: stack traceback:
mtt-1  | 2025-05-22 05:34:13: ERROR[Main]: 	/github/workspace/deserialize_mapblock.lua:26: in function 'deserialize_mapblock'
mtt-1  | 2025-05-22 05:34:13: ERROR[Main]: 	/github/workspace/deserialize_chunk.lua:23: in function 'deserialize_chunk'
mtt-1  | 2025-05-22 05:34:13: ERROR[Main]: 	/github/workspace/load.lua:8: in function 'load'
mtt-1  | 2025-05-22 05:34:13: ERROR[Main]: 	/github/workspace/mapgen.async.lua:5: in function </github/workspace/mapgen.async.lua:1>
mtt-1  | 2025-05-22 05:34:13: ERROR[Main]: 	/usr/local/share/luanti/builtin/common/register.lua:26: in function </usr/local/share/luanti/builtin/common/register.lua:12>

[LoneWolfHT]

RIP, thanks for trying