Code hot reloading

OpenDreamRuntime/DreamManager.cs

@@ -117,6 +117,29 @@
             }
         }
 
+        public void HotReloadJson(string? jsonPath) {
+            if (string.IsNullOrEmpty(jsonPath) || !File.Exists(jsonPath))
+                throw new FileNotFoundException("Could not find the specified json file");
+
+            string jsonSource = File.ReadAllText(jsonPath);
+            DreamCompiledJson? json = JsonSerializer.Deserialize<DreamCompiledJson>(jsonSource);
+            if (json == null)
+                throw new Exception("Failed to deserialize the json file");
+
+            if (!json.Metadata.Version.Equals(OpcodeVerifier.GetOpcodesHash()))
+                throw new Exception("Compiler opcode version does not match the runtime version!");
+
+            _compiledJson = json;
+            var rootPath = Path.GetFullPath(Path.GetDirectoryName(jsonPath)!);
+            var resources = _compiledJson.Resources ?? Array.Empty<string>();
+            _dreamResourceManager.Initialize(rootPath, resources);
+            if(!string.IsNullOrEmpty(_compiledJson.Interface) && !_dreamResourceManager.DoesFileExist(_compiledJson.Interface))
+                throw new FileNotFoundException("Interface DMF not found at "+Path.Join(rootPath,_compiledJson.Interface));
+            _objectTree.LoadJson(json);
+            DreamProcNative.SetupNativeProcs(_objectTree);
+
+        }
+
         public bool LoadJson(string? jsonPath) {
             if (string.IsNullOrEmpty(jsonPath) || !File.Exists(jsonPath))
                 return false;

OpenDreamRuntime/Procs/DebugAdapter/DreamDebugManager.cs

@@ -6,6 +6,8 @@
 using OpenDreamRuntime.Procs.DebugAdapter.Protocol;
 using OpenDreamRuntime.Resources;
 using Robust.Server;
+using Robust.Shared.Configuration;
+using OpenDreamShared;
 
 namespace OpenDreamRuntime.Procs.DebugAdapter;
 
@@ -15,6 +17,7 @@
     [Dependency] private readonly DreamResourceManager _resourceManager = default!;
     [Dependency] private readonly ProcScheduler _procScheduler = default!;
     [Dependency] private readonly IBaseServer _server = default!;
+    [Dependency] private readonly IConfigurationManager _configManager = default!;
 
     private ISawmill _sawmill = default!;
 
@@ -353,6 +356,9 @@
             case RequestHotReloadResource requestHotReloadResource:
                 HandleRequestHotReloadResource(client, requestHotReloadResource);
                 break;
+            case RequestHotReloadBytecode requestHotReloadBytecode:
+                HandleRequestHotReloadBytecode(client, requestHotReloadBytecode);
+                break;
             default:
                 req.RespondError(client, $"Unknown request \"{req.Command}\"");
                 break;
@@ -848,7 +854,7 @@
             requestHotReloadResource.RespondError(client, "No file provided for a hot reload");
             return;
         }
-        
+
         _sawmill.Debug("Debug adapter triggered resource hot reload for "+requestHotReloadResource.Arguments.FilePath);
         try {
             _dreamManager.HotReloadResource(requestHotReloadResource.Arguments.FilePath);
@@ -858,6 +864,21 @@
         }
     }
 
+    private void HandleRequestHotReloadBytecode(DebugAdapterClient client, RequestHotReloadBytecode requestHotReloadBytecode) {
+        if (string.IsNullOrWhiteSpace(requestHotReloadBytecode.Arguments.FilePath)) {
+            _sawmill.Error("Debug adapter requested a bytecode hot reload but didn't provide a json file");
+            requestHotReloadBytecode.RespondError(client, "No file provided for a hot reload");
+            return;
+        }
+        _sawmill.Debug($"Debug adapter triggered bytecode hot reload for file {requestHotReloadBytecode.Arguments.FilePath}");
+        try {
+            _dreamManager.HotReloadJson(_configManager.GetCVar(OpenDreamCVars.JsonPath));
+            requestHotReloadBytecode.Respond(client);
+        } catch (Exception e) {
+            requestHotReloadBytecode.RespondError(client, e.Message);
+        }
+    }
+
     private IEnumerable<DisassembledInstruction> DisassemblySkipTake(List<DisassembledInstruction> list, int midpoint, int offset, int count) {
         for (int i = midpoint + offset; i < midpoint + offset + count; ++i) {
             if (i < 0) {

OpenDreamRuntime/Procs/DebugAdapter/Protocol/Request.cs

@@ -37,6 +37,7 @@ public Request() : base("request") { }
             "disassemble" => json.Deserialize<RequestDisassemble>(),
             "hotreloadinterface" => json.Deserialize<RequestHotReloadInterface>(),
             "hotreloadresource" => json.Deserialize<RequestHotReloadResource>(),
+            "hotreloadbytecode" => json.Deserialize<RequestHotReloadBytecode>(),
             // Caller will fail to recognize it and can respond with `success: false`.
             _ => request,
         };

OpenDreamRuntime/Procs/DebugAdapter/Protocol/RequestHotReloadBytecode.cs

@@ -0,0 +1,18 @@
+using System.Text.Json.Serialization;
+using JetBrains.Annotations;
+
+namespace OpenDreamRuntime.Procs.DebugAdapter.Protocol;
+
+[UsedImplicitly]
+public sealed class RequestHotReloadBytecode : Request {
+    [JsonPropertyName("arguments")] public required RequestHotReloadBytecodeArguments Arguments { get; set; }
+
+    [UsedImplicitly]
+    public sealed class RequestHotReloadBytecodeArguments {
+        [JsonPropertyName("file")] public string? FilePath { get; set; }
+    }
+
+    public void Respond(DebugAdapterClient client) {
+        client.SendMessage(Response.NewSuccess(this));
+    }
+}