Players can no longer unilaterally use items on themselves in their inventory. When they try to use an item, they send a PlayerItemUse packet to the server with the item's details. A serverside script can then check the item and either send the packet back to make the item use go through or drop it.
Spell, potion, enchantment, creature, NPC, armor, book, clothing, miscellaneous and weapon record data can now be sent in a RecordDynamic packet. Additionally, the packets include data related to associated magical effects (for spells, potions and enchantments), data related to default inventory contents (for creatures and NPCs) and data related to body parts affected (for armor and clothing).
The server now has associated script functions for setting most of the details of the above, with the main exception being individual creature and NPC stats.
Records can either be created entirely from scratch or can use an existing record (set via the baseId variable) as a starting point for their values. In the latter case, only the values that are specifically set override the starting values. Creature and NPC records also have an inventoryBaseId that can be used on top of the baseId to base their inventories on another existing record.
The client's RecordHelper class has been heavily expanded to allow for the above mentioned functionality.
When players create spells, potions and enchantments as part of regular gameplay, they send RecordDynamic packets that provide the server with the complete details of the records that should be created. When they create enchantments, they also provide the server with armor, book, clothing and weapon records corresponding to the items they've enchanted.
This functionality added by this packet was originally supposed to be exclusive to the rewrite, but I've gone ahead and tried to provide it for the pre-rewrite in a way that can mostly be reused for the rewrite.
Although weather sync was added by Koncord to the rewrite in fd721143e2 in a way that used surprisingly few lines of code, it relied on the server requesting weather states every second from authority players and sending them to non-authority players, while also allowing only very sudden weather transitions across regions, i.e. if there was one player in the Ascadian Isles who had stormy weather, and another player with clear weather in the Bitter Coast Region walked across to the Ascadian Isles, that player was instantly made to have stormy weather with no kind of transition at all.
My approach solves both of those problems. It solves the packet spam by only sending weather updates to the server when weather changes happen or when there are new arrivals to a weather authority's region, and it allows for both sudden weather transitions when players teleport to a region and for soft, gradual transitions when players walk across to a region. It is inspired by my previous actor sync, and uses a WorldRegionAuthority packet to set players as region authorities in a similar way to how ActorAuthority sets players as cell AI authorities. Weather changes are created only by the region authority for a given region, and weather packets are also only sent by that authority.
However, it should be noted that gradual weather transitions are used by default in this implementation. To use sudden weather transitions, the serverside Lua scripts need to forward WorldWeather packets with the forceWeather boolean set to true. That is, however, already handled by our default Lua scripts in situations where it makes sense.
This should clarify the real meaning of the packet and its associated event.
The event itself has been renamed from OnPlayerKillCount to OnWorldKillCount.
Additionally, delete DedicatedPlayers who disconnect.
Previously, all disconnected DedicatedPlayers were still kept in memory, but never used again. There was code that suggested they were meant to be reused upon reconnecting, but that reuse had never actually been implemented, and would probably not be that useful anyway.
Additionally, print player guids using their string representations for consistency.
The creation and updating of DedicatedPlayer references remains very inelegant, but this commit is the first step towards fixing that.
Previously, a Container packet with a REQUEST action always made the client respond with the contents of all the containers in that cell.
The previous behavior now only happens for requests that have no WorldObjects attached, while requests that have WorldObjects attached get a reply with the contents of those specific containers.
A main priority in TES3MP development is to avoid making major changes to OpenMW code, so as to avoid merge conflicts in the future. Whenever avoiding potential conflicts seems especially difficult for the proper implementation of a particular multiplayer feature, that multiplayer feature is often put off until later or partially implemented with the intent of being revisited in the future.
Container sync is the perfect example. Previously, the OpenMW code for container actions was kept exactly as it was, with clients unilaterally accepting their own container changes as per singleplayer-specific code, with only the addition that clients sent container packets every time they made a change in a container, packets which were then forwarded unquestioningly by the server to other players. This meant that two players clicking on the same item in a container at the same time both managed to take it, thus duplicating the item.
Immediately after the packets were already forwarded, server scripts were able to check for incorrect changes, such as the removal of more items than should have existed in a container, but they had to send their own packets that attempted to fix what had already been accepted on the initial client and then forwarded to all clients, which was quite onerous in some scenarios, such as when a player on a slow connection immediately dropped items in the world after taking them from a container (which is why the default TES3MP serverside scripts made no attempt at sending corrective packets at all, preferring to expect the matter to be solved in a later C++ implementation).
This commit fixes item duping in containers by preventing container actions from initially running on clients and by ending the automatic forwarding of container packets by the server. Instead, clients now send container packets that act as requests for container actions, and serverside scripts have to forward these requests themselves. In other words, without a matching Container event in the server's Lua scripts, players are completely unable to affect containers for themselves or for others.
To forward a received Container packet, the following line must be used in a Container event in the Lua scripts:
tes3mp.SendContainer(true, true)
When an invalid action count is used in a container request, the serverside scripts can amend it using the following new function:
tes3mp.SetReceivedContainerItemActionCount(objectIndex, itemIndex, actionCount)
Thus, the serverside scripts are able to allow only container actions that are correct based on their own recorded contents for that container.
The OpenMW code allowing unilateral container actions in mwgui/container.cpp is now prevented from executing. When a player's container request is returned to them, code in mwmp/WorldEvent.cpp simulates those container actions instead.
Certain servers do not want the players to have debug information about the locations and actions of other players, so a client's log level can now be enforced by the server via the GameSettings packet.
