add basic metrics server

package.json

@@ -7,6 +7,7 @@
     "dev-proxy": "node server.js",
     "start": "run-p dev-proxy dev-rsbuild watch-mesher",
     "start2": "run-p dev-rsbuild watch-mesher",
+    "start-metrics": "ENABLE_METRICS=true rsbuild dev",
     "build": "pnpm build-other-workers && rsbuild build",
     "build-analyze": "BUNDLE_ANALYZE=true rsbuild build && pnpm build-other-workers",
     "build-single-file": "SINGLE_FILE_BUILD=true rsbuild build",
@@ -32,7 +33,8 @@
     "run-all": "run-p start run-playground",
     "build-playground": "rsbuild build --config renderer/rsbuild.config.ts",
     "watch-playground": "rsbuild dev --config renderer/rsbuild.config.ts",
-    "update-git-deps": "tsx scripts/updateGitDeps.ts"
+    "update-git-deps": "tsx scripts/updateGitDeps.ts",
+    "request-data": "tsx scripts/requestData.ts"
   },
   "keywords": [
     "prismarine",

rsbuild.config.ts

@@ -15,6 +15,7 @@ import { appAndRendererSharedConfig } from './renderer/rsbuildSharedConfig'
 import { genLargeDataAliases } from './scripts/genLargeDataAliases'
 import sharp from 'sharp'
 import supportedVersions from './src/supportedVersions.mjs'
+import { startWsServer } from './scripts/wsServer'
 
 const SINGLE_FILE_BUILD = process.env.SINGLE_FILE_BUILD === 'true'
 
@@ -59,6 +60,8 @@ const configSource = (SINGLE_FILE_BUILD ? 'BUNDLED' : (process.env.CONFIG_JSON_S
 
 const faviconPath = 'favicon.png'
 
+const enableMetrics = process.env.ENABLE_METRICS === 'true'
+
 // base options are in ./renderer/rsbuildSharedConfig.ts
 const appConfig = defineConfig({
     html: {
@@ -159,6 +162,7 @@ const appConfig = defineConfig({
             'process.env.INLINED_APP_CONFIG': JSON.stringify(configSource === 'BUNDLED' ? configJson : null),
             'process.env.ENABLE_COOKIE_STORAGE': JSON.stringify(process.env.ENABLE_COOKIE_STORAGE || true),
             'process.env.COOKIE_STORAGE_PREFIX': JSON.stringify(process.env.COOKIE_STORAGE_PREFIX || ''),
+            'process.env.WS_PORT': JSON.stringify(enableMetrics ? 8081 : false),
         },
     },
     server: {
@@ -216,6 +220,12 @@ const appConfig = defineConfig({
                         await execAsync('pnpm run build-mesher')
                     }
                     fs.writeFileSync('./dist/version.txt', buildingVersion, 'utf-8')
+
+                    // Start WebSocket server in development
+                    if (dev && enableMetrics) {
+                        await startWsServer(8081, false)
+                    }
+
                     console.timeEnd('total-prep')
                 }
                 if (!dev) {

scripts/requestData.ts

@@ -0,0 +1,42 @@
+import WebSocket from 'ws'
+
+function formatBytes(bytes: number) {
+  return `${(bytes).toFixed(2)} MB`
+}
+
+function formatTime(ms: number) {
+  return `${(ms / 1000).toFixed(2)}s`
+}
+
+const ws = new WebSocket('ws://localhost:8081')
+
+ws.on('open', () => {
+  console.log('Connected to metrics server, waiting for metrics...')
+})
+
+ws.on('message', (data) => {
+  try {
+    const metrics = JSON.parse(data.toString())
+    console.log('\nPerformance Metrics:')
+    console.log('------------------')
+    console.log(`Load Time: ${formatTime(metrics.loadTime)}`)
+    console.log(`Memory Usage: ${formatBytes(metrics.memoryUsage)}`)
+    console.log(`Timestamp: ${new Date(metrics.timestamp).toLocaleString()}`)
+    if (!process.argv.includes('-f')) { // follow mode
+      process.exit(0)
+    }
+  } catch (error) {
+    console.error('Error parsing metrics:', error)
+  }
+})
+
+ws.on('error', (error) => {
+  console.error('WebSocket error:', error)
+  process.exit(1)
+})
+
+// Exit if no metrics received after 5 seconds
+setTimeout(() => {
+  console.error('Timeout waiting for metrics')
+  process.exit(1)
+}, 5000)

scripts/wsServer.ts

@@ -0,0 +1,45 @@
+import {WebSocketServer} from 'ws'
+
+export function startWsServer(port: number = 8081, tryOtherPort: boolean = true): Promise<number> {
+  return new Promise((resolve, reject) => {
+    const tryPort = (currentPort: number) => {
+      const wss = new WebSocketServer({ port: currentPort })
+        .on('listening', () => {
+          console.log(`WebSocket server started on port ${currentPort}`)
+          resolve(currentPort)
+        })
+        .on('error', (err: any) => {
+          if (err.code === 'EADDRINUSE' && tryOtherPort) {
+            console.log(`Port ${currentPort} in use, trying ${currentPort + 1}`)
+            wss.close()
+            tryPort(currentPort + 1)
+          } else {
+            reject(err)
+          }
+        })
+
+      wss.on('connection', (ws) => {
+        console.log('Client connected')
+
+        ws.on('message', (message) => {
+          try {
+            // Simply relay the message to all connected clients except sender
+            wss.clients.forEach(client => {
+              if (client !== ws && client.readyState === WebSocket.OPEN) {
+                client.send(message.toString())
+              }
+            })
+          } catch (error) {
+            console.error('Error processing message:', error)
+          }
+        })
+
+        ws.on('close', () => {
+          console.log('Client disconnected')
+        })
+      })
+    }
+
+    tryPort(port)
+  })
+}

src/devtools.ts

@@ -209,3 +209,106 @@ setInterval(() => {
 }, 1000)
 
 // ---
+
+// Add type declaration for performance.memory
+declare global {
+  interface Performance {
+    memory?: {
+      usedJSHeapSize: number
+      totalJSHeapSize: number
+      jsHeapSizeLimit: number
+    }
+  }
+}
+
+// Performance metrics WebSocket client
+let ws: WebSocket | null = null
+let wsReconnectTimeout: NodeJS.Timeout | null = null
+let metricsInterval: NodeJS.Timeout | null = null
+
+// Start collecting metrics immediately
+const startTime = performance.now()
+
+function collectAndSendMetrics () {
+  if (!ws || ws.readyState !== WebSocket.OPEN) return
+
+  const metrics = {
+    loadTime: performance.now() - startTime,
+    memoryUsage: (performance.memory?.usedJSHeapSize ?? 0) / 1024 / 1024,
+    timestamp: Date.now()
+  }
+
+  ws.send(JSON.stringify(metrics))
+}
+
+function getWebSocketUrl () {
+  const wsPort = process.env.WS_SERVER
+  if (!wsPort) return null
+
+  const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:'
+  const { hostname } = window.location
+  return `${protocol}//${hostname}:${wsPort}`
+}
+
+function connectWebSocket () {
+  if (ws) return
+
+  const wsUrl = getWebSocketUrl()
+  if (!wsUrl) {
+    console.log('WebSocket server not configured')
+    return
+  }
+
+  ws = new WebSocket(wsUrl)
+
+  ws.onopen = () => {
+    console.log('Connected to metrics server')
+    if (wsReconnectTimeout) {
+      clearTimeout(wsReconnectTimeout)
+      wsReconnectTimeout = null
+    }
+
+    // Start sending metrics immediately after connection
+    collectAndSendMetrics()
+
+    // Clear existing interval if any
+    if (metricsInterval) {
+      clearInterval(metricsInterval)
+    }
+
+    // Set new interval
+    metricsInterval = setInterval(collectAndSendMetrics, 500)
+  }
+
+  ws.onclose = () => {
+    console.log('Disconnected from metrics server')
+    ws = null
+
+    // Clear metrics interval
+    if (metricsInterval) {
+      clearInterval(metricsInterval)
+      metricsInterval = null
+    }
+
+    // Try to reconnect after 3 seconds
+    wsReconnectTimeout = setTimeout(connectWebSocket, 3000)
+  }
+
+  ws.onerror = (error) => {
+    console.error('WebSocket error:', error)
+  }
+}
+
+// Connect immediately
+connectWebSocket()
+
+// Add command to request current metrics
+window.requestMetrics = () => {
+  const metrics = {
+    loadTime: performance.now() - startTime,
+    memoryUsage: (performance.memory?.usedJSHeapSize ?? 0) / 1024 / 1024,
+    timestamp: Date.now()
+  }
+  console.log('Current metrics:', metrics)
+  return metrics
+}

src/env.d.ts

@@ -3,6 +3,7 @@ declare namespace NodeJS {
     // Build configuration
     NODE_ENV: 'development' | 'production'
     SINGLE_FILE_BUILD?: string
+    WS_SERVER?: string
     DISABLE_SERVICE_WORKER?: string
     CONFIG_JSON_SOURCE?: 'BUNDLED' | 'REMOTE'
     LOCAL_CONFIG_FILE?: string