Real-time log streaming via SSE

launcher/launcher/src/main/java/sashegdev/zernmc/launcher/ui/jfx/JFXLauncher.java

@@ -258,6 +258,7 @@ public class JFXLauncher extends Application {
         server.createContext("/api/launch", this::handleLaunch);
         server.createContext("/api/install", this::handleInstall);
         server.createContext("/api/logs", this::handleLogs);
+        server.createContext("/api/logs/stream", this::handleLogsStream);
         server.createContext("/api/game-logs", this::handleGameLogs);
         server.createContext("/api/mc-versions", this::handleMCVersions);
         server.createContext("/api/loader-versions", this::handleLoaderVersions);
@@ -396,6 +397,49 @@ public class JFXLauncher extends Application {
         sendJson(exchange, Map.of("success", true, "data", logBuffer.toString()));
     }
 
+    private void handleLogsStream(HttpExchange exchange) {
+        try {
+            exchange.getResponseHeaders().set("Content-Type", "text/event-stream");
+            exchange.getResponseHeaders().set("Cache-Control", "no-cache");
+            exchange.getResponseHeaders().set("Connection", "keep-alive");
+            exchange.sendResponseHeaders(200, 0);
+
+            String lastLog = "";
+            int sameCount = 0;
+            final OutputStream os = exchange.getResponseBody();
+
+            Thread.currentThread().setName("LogStream-" + System.currentTimeMillis());
+
+            for (int i = 0; !Thread.currentThread().isInterrupted() && i < 3000; i++) {
+                String currentLog = logBuffer.toString();
+                if (!currentLog.equals(lastLog)) {
+                    String newContent = currentLog.substring(lastLog.length());
+                    if (!newContent.isEmpty()) {
+                        for (String line : newContent.split("\n")) {
+                            if (!line.trim().isEmpty()) {
+                                String data = "data: " + line.replace("\n", "").replace("\r", "") + "\n\n";
+                                os.write(data.getBytes(StandardCharsets.UTF_8));
+                                os.flush();
+                            }
+                        }
+                    }
+                    lastLog = currentLog;
+                    sameCount = 0;
+                } else {
+                    sameCount++;
+                    if (sameCount > 50) {
+                        os.write("data: \n\n".getBytes(StandardCharsets.UTF_8));
+                        os.flush();
+                        sameCount = 0;
+                    }
+                }
+                Thread.sleep(100);
+            }
+        } catch (Exception ignored) {} finally {
+            try { exchange.getResponseBody().close(); } catch (Exception ignored) {}
+        }
+    }
+
     private void handleGameLogs(HttpExchange exchange) {
         sendJson(exchange, Map.of("success", true, "data", getGameLogs()));
     }

launcher/launcher/src/resources/ui/launcher.js

@@ -1,5 +1,5 @@
 const API_BASE = '/api';
-let consoleLogPollingInterval = null;
+let consoleEventSource = null;
 
 class LauncherApp {
     constructor() {
@@ -11,70 +11,40 @@ class LauncherApp {
         this.selectedInstance = null;
         this.hasUpdate = false;
         this.hasMismatches = false;
-        this.consoleLogBuffer = '';
         this.init();
     }
 
     async init() {
         this.bindEvents();
         this.initGridAnimation();
-        this.startConsoleLogPolling();
         await this.checkAuth();
     }
 
-    startConsoleLogPolling() {
-        this.pollConsoleLogs();
-        consoleLogPollingInterval = setInterval(() => this.pollConsoleLogs(), 2000);
+    startConsoleLogStream() {
+        if (consoleEventSource) {
+            consoleEventSource.close();
         }
 
-    stopConsoleLogPolling() {
-        if (consoleLogPollingInterval) {
-            clearInterval(consoleLogPollingInterval);
-            consoleLogPollingInterval = null;
+        consoleEventSource = new EventSource(API_BASE + '/logs/stream');
+
+        consoleEventSource.onmessage = (event) => {
+            if (event.data && event.data.trim()) {
+                this.addLog(event.data, this.getLogType(event.data));
             }
+        };
+
+        consoleEventSource.onerror = () => {
+            consoleEventSource.close();
+            setTimeout(() => this.startConsoleLogStream(), 3000);
+        };
     }
 
-    async pollConsoleLogs() {
-        try {
-            const response = await fetch(`${API_BASE}/logs`);
-            const result = await response.json();
-            if (result.success && result.data) {
-                const newLogs = result.data;
-                if (newLogs !== this.consoleLogBuffer) {
-                    this.consoleLogBuffer = newLogs;
-                    this.syncConsoleLogs(newLogs);
+    stopConsoleLogStream() {
+        if (consoleEventSource) {
+            consoleEventSource.close();
+            consoleEventSource = null;
         }
     }
-        } catch (e) {
-            // Silent fail for polling
-        }
-    }
-
-    syncConsoleLogs(fullLogs) {
-        const lines = fullLogs.split('\n').filter(l => l.trim());
-        const container = document.getElementById('logs-container');
-        if (!container) return;
-
-        const existingLines = Array.from(container.querySelectorAll('.log-entry')).length;
-        const newLines = lines.slice(existingLines);
-
-        newLines.forEach(line => {
-            if (!line.trim()) return;
-            const entry = document.createElement('div');
-            entry.className = 'log-entry ' + this.getLogType(line);
-
-            const timestampMatch = line.match(/^\[(\d{2}:\d{2}:\d{2})\]/);
-            if (timestampMatch) {
-                entry.textContent = line;
-            } else {
-                const time = new Date().toLocaleTimeString();
-                entry.textContent = '[' + time + '] ' + line;
-            }
-            container.appendChild(entry);
-        });
-
-        container.scrollTop = container.scrollHeight;
-    }
 
     getLogType(line) {
         if (line.includes('[STDOUT]') || line.includes('Render thread/ERROR') || line.includes('/ERROR]:')) return 'error';
@@ -202,6 +172,7 @@ class LauncherApp {
             this.account = result.data;
             this.username = result.data.username;
             this.showMainScreen();
+            this.startConsoleLogStream();
             await this.loadInstances();
         } else {
             this.showLoginScreen();
@@ -241,6 +212,7 @@ class LauncherApp {
             this.account = result.data;
             this.username = result.data.username;
             this.showMainScreen();
+            this.startConsoleLogStream();
             await this.loadInstances();
         } else {
             this.showError(result.error || 'Ошибка входа');
@@ -248,6 +220,7 @@ class LauncherApp {
     }
 
     async handleLogout() {
+        this.stopConsoleLogStream();
         this.username = null;
         this.account = null;
         this.currentInstance = null;
@@ -610,9 +583,8 @@ class LauncherApp {
     }
 
     clearLogs() {
-        this.consoleLogBuffer = '';
         const container = document.getElementById('logs-container');
-        container.innerHTML = '<div class="log-entry info">Логи очищены</div>';
+        container.innerHTML = '<div class="log-entry info">Логи очищены (консоль продолжает)</div>';
     }
 
     showLoginScreen() {