adjusts on client-server connection (LSP)

prometeu-lsp/prometeu-lsp-api/src/main/java/p/studio/lsp/messages/LspServerConfiguration.java

@@ -7,7 +7,7 @@ import lombok.Getter;
 @Getter
 public class LspServerConfiguration {
     public static final String DEFAULT_HOST = "127.0.0.1";
-    public static final int DEFAULT_PORT = 7777;
+    public static final int DEFAULT_PORT = 7775;
 
     @Builder.Default
     private final LspServerEndpoint endpoint = new LspServerEndpoint(DEFAULT_HOST, DEFAULT_PORT);

tools/vscode-extension/README.md

@@ -7,7 +7,7 @@ This extension does **not** start the language server itself. It connects to the
 ```text
 VS Code Extension
     -> vscode-languageclient
-    -> TCP 127.0.0.1:7777
+    -> TCP 127.0.0.1:7775
     -> Prometeu Studio Java/LSP4J
 ```
 
@@ -21,7 +21,7 @@ VS Code Extension
 The Studio LSP server must be listening on:
 
 ```text
-127.0.0.1:7777
+127.0.0.1:7775
 ```
 
 ## Install dependencies
@@ -80,7 +80,7 @@ View -> Output -> Prometeu LSP
 
 ```text
 Prometeu VS Code extension activated.
-Connecting to Prometeu Studio LSP at 127.0.0.1:7777...
+Connecting to Prometeu Studio LSP at 127.0.0.1:7775...
 TCP connection established with Prometeu Studio.
 Prometeu Studio LSP client started.
 [Info] Hello from Prometeu Studio LSP
@@ -136,7 +136,7 @@ Default settings:
 ```json
 {
   "prometeu.studio.host": "127.0.0.1",
-  "prometeu.studio.port": 7777
+  "prometeu.studio.port": 7775
 }
 ```
 

tools/vscode-extension/package.json

@@ -48,7 +48,7 @@
         },
         "prometeu.studio.port": {
           "type": "number",
-          "default": 7777,
+          "default": 7775,
           "description": "Prometeu Studio LSP TCP port."
         }
       }

tools/vscode-extension/src/extension.ts

@@ -2,16 +2,25 @@ import * as net from "node:net";
 import * as vscode from "vscode";
 
 import {
+    CloseAction,
+    ErrorAction,
     LanguageClient,
     LanguageClientOptions,
     ServerOptions,
+    State,
     StreamInfo
 } from "vscode-languageclient/node";
 
 let client: LanguageClient | undefined;
 let output: vscode.OutputChannel;
+let reconnectTimer: NodeJS.Timeout | undefined;
+let reconnectContext: vscode.ExtensionContext | undefined;
+let stoppingClient = false;
+
+const RECONNECT_DELAY_MS = 2000;
 
 export function activate(context: vscode.ExtensionContext): void {
+    reconnectContext = context;
     output = vscode.window.createOutputChannel("Prometeu LSP");
     output.appendLine("Prometeu VS Code extension activated.");
 
@@ -40,6 +49,8 @@ export async function deactivate(): Promise<void> {
 }
 
 async function startClient(context: vscode.ExtensionContext): Promise<void> {
+    clearReconnectTimer();
+
     if (client) {
         output.appendLine("Prometeu LSP client is already running.");
         return;
@@ -48,7 +59,7 @@ async function startClient(context: vscode.ExtensionContext): Promise<void> {
     const config = vscode.workspace.getConfiguration("prometeu.studio");
 
     const host = config.get<string>("host", "127.0.0.1");
-    const port = config.get<number>("port", 7777);
+    const port = config.get<number>("port", 7775);
 
     output.show(true);
     output.appendLine(`Connecting to Prometeu Studio LSP at ${host}:${port}...`);
@@ -114,38 +125,66 @@ async function startClient(context: vscode.ExtensionContext): Promise<void> {
             clientKind: "vscode",
             prometeuClientVersion: context.extension.packageJSON.version
         },
-        outputChannel: output
+        outputChannel: output,
+        errorHandler: {
+            error: (error) => {
+                output.appendLine(`Prometeu LSP transport error: ${error.message}`);
+                return { action: ErrorAction.Continue };
+            },
+            closed: () => {
+                output.appendLine("Prometeu LSP transport closed.");
+                return { action: CloseAction.DoNotRestart };
+            }
+        }
     };
 
-    client = new LanguageClient(
+    const nextClient = new LanguageClient(
         "prometeuStudioLsp",
         "Prometeu Studio LSP",
         serverOptions,
         clientOptions
     );
+    client = nextClient;
+    nextClient.onDidChangeState((event) => {
+        output.appendLine(`Prometeu LSP state changed: ${State[event.oldState]} -> ${State[event.newState]}`);
+        if (event.newState !== State.Stopped) {
+            return;
+        }
+        if (client === nextClient) {
+            client = undefined;
+        }
+        if (!stoppingClient) {
+            scheduleReconnect();
+        }
+    });
 
     try {
-        await client.start();
+        await nextClient.start();
 
         output.appendLine("Prometeu Studio LSP client started.");
         vscode.window.showInformationMessage("Connected to Prometeu Studio LSP.");
     } catch (error) {
+        if (client === nextClient) {
             client = undefined;
+        }
 
         const message = error instanceof Error ? error.message : String(error);
 
         output.appendLine(`Failed to start Prometeu LSP client: ${message}`);
         vscode.window.showErrorMessage(`Could not connect to Prometeu Studio LSP: ${message}`);
+        scheduleReconnect();
     }
 }
 
 async function stopClient(): Promise<void> {
+    clearReconnectTimer();
     if (!client) {
         return;
     }
 
     const currentClient = client;
     client = undefined;
+    stoppingClient = true;
 
     output.appendLine("Stopping Prometeu Studio LSP client...");
 
@@ -155,5 +194,29 @@ async function stopClient(): Promise<void> {
     } catch (error) {
         const message = error instanceof Error ? error.message : String(error);
         output.appendLine(`Failed to stop Prometeu LSP client cleanly: ${message}`);
+    } finally {
+        stoppingClient = false;
     }
 }
+
+function scheduleReconnect(): void {
+    if (!reconnectContext) {
+        return;
+    }
+    if (reconnectTimer || client) {
+        return;
+    }
+    output.appendLine(`Scheduling Prometeu LSP reconnect in ${RECONNECT_DELAY_MS}ms...`);
+    reconnectTimer = setTimeout(() => {
+        reconnectTimer = undefined;
+        void startClient(reconnectContext!);
+    }, RECONNECT_DELAY_MS);
+}
+
+function clearReconnectTimer(): void {
+    if (!reconnectTimer) {
+        return;
+    }
+    clearTimeout(reconnectTimer);
+    reconnectTimer = undefined;
+}