PlaceBlock(placeAt) & block breaking support(1.16)

[aria1th]

while (world.getBlockAt(bx,by,bz).getBlockId() == 'lectern'){
player.updateBreakingBlock(bx,by,bz);
sleep(50);}

example code for block breaking should be like that, client should 'update' or 'attack' block every 50ms. Unless client 'cancels' block breaking... I'm not sure if client would need to call cancel function.

placing block functions barely work, but I don't know if I should do complex inventory swap inside same class.

[senseiwells]

For the placing I would just try to place the item that is currently in the players hand. If the player is not holding a BlockItem then throw an error? This allows the user to code the swapping slots instead

[aria1th]

hmm yeah that's way better, actually I was trying to implement piston rotating / anvil rotating things, it requires different handling by block types... but it's future problem

[senseiwells]

I don't think either interactionManager.interactBlock or interactionManager.updateBlockBreakingProgress are thread safe, they both access the player's inventory which is probably what is causing your concurrentModificationException

[aria1th]

that might explain it, updateBlockBreakingProgress seems okay, but interactBlock weirdly access player inventory.... it crashes when player picks up item at empty slot, not sure why this is happening tho. it can be tweaked a bit to directly send packet hmm...

[senseiwells]

Just push it back to the main thread

client.execute(() -> {
    // code
});

[aria1th]

yes it works, still some memory sum up but it does not exceed 4GB so it should be okay

[aria1th]

Still, it causes some invalid Map operations, I just tweaked to use packet instead but it will result some failure (because its packet)
maybe function name should be changed to attemptInteractAt ?

[senseiwells]

What invalid Map operations?

[aria1th]

same iteration problem, so now I tweaked all into packet handling at 1.18 branch... but seems item swap code is also packet dependent so its order messes up without sleep().

[senseiwells]

Would it be better for us to talk on discord? Github is kinda... slow xD

[senseiwells]

The updateSlotPacket is pointless, Minecraft ticks this, and if you change it, it will automatically send a packet for you. No need to do this manually.

You also do this:

ArucasMinecraftExtension.getClient().execute(() -> {
    interactionManager.clickSlot(screenHandler.syncId, numberValue1.value.intValue(), 0, SlotActionType.SWAP, player);
    interactionManager.clickSlot(screenHandler.syncId, numberValue2.value.intValue(), 0, SlotActionType.SWAP, player);
    interactionManager.clickSlot(screenHandler.syncId, numberValue1.value.intValue(), 0, SlotActionType.SWAP, player);
}

Also you don't need to do all those checks for the direction, you can just do, which you do already, so I'm not sure why you check the string xD

var direction = Direction.byName(direction);
if (direction == null) {
    // Throw error
}

I also wouldn't send the PlayerInteractBlockC2SPacket, you should keep to the interactionManager.interactBlock()... This will cause desyncs, you could also make this return a boolean, whether it was successful, but you'll probably need to use an AtomicReference and a latch because it's threaded though hmm