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Fix turtles capturing their own drops when broken

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There's a whole load of gnarly issues that occur when a turtle is broken
mid-dig/attack (normally due to an explosion). We fixed most of these in
24af36743d, but not perfectly.

Part of the fix here was to not capture drops if the turtle BE has been
removed. However, on removal, turtles drop their items *before* removing
the BE. This meant that the drop consumer still triggered, and attempted
to insert items back into the turtle.

This bug only triggers if the turtle contains a stack larger than 10
(ish, I think) items, which is possibly why I'd never reproduced before.

We now drop items after removing the BE, which resolves the issue.

Fixes #1936.
This commit is contained in:
Jonathan Coates 2024-08-15 10:32:54 +01:00
parent 356c8e8aeb
commit b7a8432cfb
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GPG Key ID: B9E431FF07C98D06
3 changed files with 13 additions and 8 deletions
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10
projects/common/src/main/java/dan200/computercraft/shared/turtle/blocks/TurtleBlock.java
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@ -125,11 +125,15 @@ public class TurtleBlock extends AbstractComputerBlock<TurtleBlockEntity> implem
public final void onRemove(BlockState state, Level level, BlockPos pos, BlockState newState, boolean isMoving) { public final void onRemove(BlockState state, Level level, BlockPos pos, BlockState newState, boolean isMoving) {
if (state.is(newState.getBlock())) return; if (state.is(newState.getBlock())) return;
if (!level.isClientSide && level.getBlockEntity(pos) instanceof TurtleBlockEntity turtle && !turtle.hasMoved()) { // Most blocks drop items and then remove the BE. However, if a turtle is consuming drops right now, that can
Containers.dropContents(level, pos, turtle); // lead to loops where it tries to insert an item back into the inventory. To prevent this, take a reference to
} // the turtle BE now, remove it, and then drop the items.
var turtle = !level.isClientSide && level.getBlockEntity(pos) instanceof TurtleBlockEntity t && !t.hasMoved()
? t : null;
super.onRemove(state, level, pos, newState, isMoving); super.onRemove(state, level, pos, newState, isMoving);
if (turtle != null) Containers.dropContents(level, pos, turtle);
} }
@Override @Override

9
projects/common/src/testMod/kotlin/dan200/computercraft/gametest/Turtle_Test.kt
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@ -696,15 +696,16 @@ class Turtle_Test {
/** /**
* Tests a turtle can break a block that explodes, causing the turtle itself to explode. * Tests a turtle can break a block that explodes, causing the turtle itself to explode.
* *
* This attempts to test [#585](https://github.com/cc-tweaked/CC-Tweaked/issues/585) and other similar issues. It's * @see [#585](https://github.com/cc-tweaked/CC-Tweaked/issues/585).
* not clear if this is a good test case, as that bug does not seem reliably reproducible, but it's at least a good
* sanity check.
*/ */
@GameTest @GameTest
fun Breaks_exploding_block(context: GameTestHelper) = context.sequence { fun Breaks_exploding_block(context: GameTestHelper) = context.sequence {
thenOnComputer { turtle.dig(Optional.empty()) } thenOnComputer { turtle.dig(Optional.empty()) }
thenIdle(2) thenIdle(2)
thenExecute { context.assertItemEntityPresent(ModRegistry.Items.TURTLE_NORMAL.get(), BlockPos(2, 2, 2), 1.0) } thenExecute {
context.assertItemEntityCountIs(ModRegistry.Items.TURTLE_NORMAL.get(), BlockPos(2, 2, 2), 1.0, 1)
context.assertItemEntityCountIs(Items.BONE_BLOCK, BlockPos(2, 2, 2), 1.0, 65)
}
} }
/** /**

2
projects/common/src/testMod/resources/data/cctest/structures/turtle_test.breaks_exploding_block.snbt generated
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@ -39,7 +39,7 @@
{pos: [1, 1, 4], state: "minecraft:barrier"}, {pos: [1, 1, 4], state: "minecraft:barrier"},
{pos: [2, 1, 0], state: "minecraft:barrier"}, {pos: [2, 1, 0], state: "minecraft:barrier"},
{pos: [2, 1, 1], state: "minecraft:air"}, {pos: [2, 1, 1], state: "minecraft:air"},
{pos: [2, 1, 2], state: "computercraft:turtle_normal{facing:south,waterlogged:false}", nbt: {ComputerId: 1, Fuel: 0, Items: [], Label: "turtle_test.breaks_exploding_block", LeftUpgrade: "minecraft:diamond_pickaxe", LeftUpgradeNbt: {Tag: {Damage: 0}}, On: 1b, Owner: {LowerId: -5670393268852517359L, Name: "Player172", UpperId: 3578583684139923613L}, Slot: 0, id: "computercraft:turtle_normal"}}, {pos: [2, 1, 2], state: "computercraft:turtle_normal{facing:south,waterlogged:false}", nbt: {ComputerId: 1, Fuel: 0, Items: [], Label: "turtle_test.breaks_exploding_block", LeftUpgrade: "minecraft:diamond_pickaxe", LeftUpgradeNbt: {Tag: {Damage: 0}}, On: 1b, Owner: {LowerId: -5670393268852517359L, Name: "Player172", UpperId: 3578583684139923613L}, Slot: 0, Items: [{Count: 64b, Slot: 0b, id: "minecraft:bone_block"}], id: "computercraft:turtle_normal"}},
{pos: [2, 1, 3], state: "minecraft:bone_block{axis:y}"}, {pos: [2, 1, 3], state: "minecraft:bone_block{axis:y}"},
{pos: [2, 1, 4], state: "minecraft:barrier"}, {pos: [2, 1, 4], state: "minecraft:barrier"},
{pos: [3, 1, 0], state: "minecraft:barrier"}, {pos: [3, 1, 0], state: "minecraft:barrier"},