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NitroxPatcher/Patches/Dynamic/RocketConstructor_StartRocketConstruction_Patch.cs

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+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Reflection.Emit;
+using HarmonyLib;
+using NitroxClient.GameLogic;
+using NitroxModel.DataStructures;
+using NitroxModel.Helper;
+
+namespace NitroxPatcher.Patches.Dynamic;
+
+public sealed partial class RocketConstructor_StartRocketConstruction_Patch : NitroxPatch, IDynamicPatch
+{
+    private static readonly MethodInfo TARGET_METHOD = Reflect.Method((RocketConstructor t) => t.StartRocketConstruction());
+    private static readonly OpCode INJECTION_CODE = OpCodes.Stloc_2;
+
+    public static IEnumerable<CodeInstruction> Transpiler(MethodBase original, IEnumerable<CodeInstruction> instructions)
+    {
+        foreach (CodeInstruction instruction in instructions)
+        {
+            yield return instruction;
+
+            /* if (this.crafterLogic.Craft(currentStageTech, craftTime)) {
+             *      GameObject toBuild = this.rocket.StartRocketConstruction();
+             *  ->  RocketConstructor_StartRocketConstruction_Patch.Callback(this.rocket);
+             *      ItemGoalTracker.OnConstruct(currentStageTech);
+             *      this.SendBuildBots(toBuild);
+             * }
+             */
+            if (instruction.opcode == INJECTION_CODE)
+            {
+                yield return new CodeInstruction(OpCodes.Ldarg_0); //this
+                yield return new CodeInstruction(OpCodes.Ldfld, Reflect.Field((RocketConstructor t) => t.rocket)); // this.rocket
+                yield return new CodeInstruction(OpCodes.Call, ((Action<Rocket>)Callback).Method);
+            }
+        }
+    }
+
+    private static void Callback(Rocket rocket)
+    {
+        if (rocket.TryGetIdOrWarn(out NitroxId rocketId))
+        {
+            Resolve<Entities>().EntityMetadataChanged(rocket, rocketId);
+        }
+    }
+}