logging

src/main/index.ts

@@ -1,5 +1,6 @@
 import { app, BrowserWindow, desktopCapturer, dialog, ipcMain, Menu, screen, session, shell } from 'electron'
 import type { BrowserWindowConstructorOptions, MenuItemConstructorOptions, OpenDialogOptions, WebContents } from 'electron'
+import { appendFile, mkdir, writeFile } from 'node:fs/promises'
 import { extname, join, resolve } from 'path'
 import type {
   AstraControlCommand,
@@ -22,7 +23,7 @@ import type {
   ThemeLibrarySnapshot,
 } from '../types/theme'
 import { RESIZE_DIRECTIONS, type ResizeDirection } from '../types/windowResize'
-import type { PerformanceMemorySnapshot } from '../types/performance'
+import type { PerformanceMemoryLogRecord, PerformanceMemorySnapshot } from '../types/performance'
 import { normalizeProfile } from '../shared/profileState'
 import { calculateResizedWindowBounds } from '../shared/windowResize'
 import { FileBackedProfileLibrary } from './profileLibrary'
@@ -70,6 +71,12 @@ const POPOUT_DEFAULTS = {
   minWidth: 220,
   minHeight: 160,
 }
+const MEMORY_LOG_DIRECTORY_NAME = 'Prism Logs'
+const MEMORY_LOG_FILE_NAME = 'memory-trace-latest.csv'
+const memoryLogSessionStartedAt = Date.now()
+let memoryLogInitialized = false
+let memoryLogInitialization: Promise<void> | null = null
+let memoryLogWriteQueue: Promise<void> = Promise.resolve()
 
 function kilobytesToMegabytes(value: number | undefined): number {
   return Math.round((((value ?? 0) / 1024) * 10)) / 10
@@ -90,6 +97,101 @@ function sumWorkingSet(metrics: Electron.ProcessMetric[], predicate: (metric: El
   return kilobytesToMegabytes(totalKilobytes)
 }
 
+function getMemoryLogDirectory(): string {
+  return join(app.getPath('documents'), MEMORY_LOG_DIRECTORY_NAME)
+}
+
+function getMemoryLogPath(): string {
+  return join(getMemoryLogDirectory(), MEMORY_LOG_FILE_NAME)
+}
+
+function escapeCsvField(value: string | number | boolean | null): string {
+  if (value === null) {
+    return ''
+  }
+
+  const text = String(value)
+  if (!/[",\n]/.test(text)) {
+    return text
+  }
+
+  return `"${text.replace(/"/g, '""')}"`
+}
+
+async function ensureMemoryLogFile(): Promise<void> {
+  if (memoryLogInitialized) {
+    return
+  }
+
+  if (!memoryLogInitialization) {
+    memoryLogInitialization = (async () => {
+      await mkdir(getMemoryLogDirectory(), { recursive: true })
+      const header = [
+        'session_started_at_iso',
+        'captured_at_iso',
+        'elapsed_s',
+        'app_mb',
+        'main_mb',
+        'renderer_mb',
+        'renderer_private_mb',
+        'gpu_mb',
+        'utility_mb',
+        'js_heap_used_mb',
+        'js_heap_limit_mb',
+        'renderer_delta_mb',
+        'app_delta_mb',
+        'frame_target',
+        'docked_render_fps',
+        'is_capturing',
+        'capture_status',
+        'visible_scopes',
+        'popped_out_scopes',
+      ].join(',')
+      await writeFile(getMemoryLogPath(), `${header}\n`, 'utf8')
+      memoryLogInitialized = true
+    })().finally(() => {
+      memoryLogInitialization = null
+    })
+  }
+
+  await memoryLogInitialization
+}
+
+function queueMemoryLogWrite(record: PerformanceMemoryLogRecord): void {
+  const line = [
+    new Date(memoryLogSessionStartedAt).toISOString(),
+    new Date(record.capturedAt).toISOString(),
+    record.elapsedSeconds.toFixed(1),
+    record.appMb.toFixed(1),
+    record.mainMb.toFixed(1),
+    record.rendererMb.toFixed(1),
+    record.rendererPrivateMb === null ? '' : record.rendererPrivateMb.toFixed(1),
+    record.gpuMb.toFixed(1),
+    record.utilityMb.toFixed(1),
+    record.jsHeapUsedMb === null ? '' : record.jsHeapUsedMb.toFixed(1),
+    record.jsHeapLimitMb === null ? '' : record.jsHeapLimitMb.toFixed(1),
+    record.rendererDeltaMb.toFixed(1),
+    record.appDeltaMb.toFixed(1),
+    record.frameTarget,
+    Math.round(record.dockedRenderFps),
+    record.isCapturing,
+    record.captureStatus,
+    record.visibleScopes.join('|'),
+    record.poppedOutScopes.join('|'),
+  ]
+    .map((field) => escapeCsvField(field))
+    .join(',')
+
+  memoryLogWriteQueue = memoryLogWriteQueue
+    .then(async () => {
+      await ensureMemoryLogFile()
+      await appendFile(getMemoryLogPath(), `${line}\n`, 'utf8')
+    })
+    .catch((error: unknown) => {
+      console.error('Failed to write memory trace log:', error)
+    })
+}
+
 function getProfileLibrary(): FileBackedProfileLibrary {
   if (!profileLibrary) {
     profileLibrary = new FileBackedProfileLibrary(
@@ -923,6 +1025,16 @@ function setupIPC(): void {
     return getWindowFromSender(event.sender)?.isAlwaysOnTop() ?? true
   })
 
+  ipcMain.handle('performance:get-memory-log-path', async () => {
+    await ensureMemoryLogFile()
+    return getMemoryLogPath()
+  })
+
+  ipcMain.handle('performance:reveal-memory-log', async () => {
+    await ensureMemoryLogFile()
+    shell.showItemInFolder(getMemoryLogPath())
+  })
+
   ipcMain.handle('performance:get-memory-snapshot', async (event): Promise<PerformanceMemorySnapshot> => {
     const metrics = app.getAppMetrics()
     const senderPid = event.sender.getOSProcessId()
@@ -942,6 +1054,10 @@ function setupIPC(): void {
     }
   })
 
+  ipcMain.handle('performance:append-memory-log', async (_event, record: PerformanceMemoryLogRecord) => {
+    queueMemoryLogWrite(record)
+  })
+
   ipcMain.handle('audio:get-desktop-sources', async () => {
     const sources = await desktopCapturer.getSources({ types: ['screen'] })
     return sources.map((s) => ({ id: s.id, name: s.name }))

src/preload/index.ts

@@ -28,7 +28,7 @@ import type {
 } from '../types/theme'
 import type { ResizeDirection } from '../types/windowResize'
 import type { VisualizerDSP } from '../renderer/audio/native/visualizer-dsp'
-import type { PerformanceMemorySnapshot } from '../types/performance'
+import type { PerformanceMemoryLogRecord, PerformanceMemorySnapshot } from '../types/performance'
 
 type NativeAddonModule = VisualizerDSP & NativeCaptureAPI
 
@@ -50,6 +50,11 @@ contextBridge.exposeInMainWorld('electronAPI', {
   repositionWindow: (position: 'top' | 'bottom') => ipcRenderer.send('window:reposition', position),
   toggleAlwaysOnTop: () => ipcRenderer.send('window:toggle-always-on-top'),
   isAlwaysOnTop: () => ipcRenderer.invoke('window:is-always-on-top'),
+  getPerformanceMemoryLogPath: () => ipcRenderer.invoke('performance:get-memory-log-path') as Promise<string>,
+  revealPerformanceMemoryLog: () => ipcRenderer.invoke('performance:reveal-memory-log') as Promise<void>,
+  appendPerformanceMemoryLog: (record: PerformanceMemoryLogRecord) => {
+    return ipcRenderer.invoke('performance:append-memory-log', record) as Promise<void>
+  },
   getPerformanceMemorySnapshot: async () => {
     const snapshot = await ipcRenderer.invoke('performance:get-memory-snapshot') as PerformanceMemorySnapshot
     try {

src/renderer/components/BottomBar.tsx

@@ -40,6 +40,7 @@ export default function BottomBar({ onClose, onHeightChange }: BottomBarProps):
   const rootRef = useRef<HTMLDivElement | null>(null)
   const [astraBaseUrlInput, setAstraBaseUrlInput] = useState('')
   const [astraTokenInput, setAstraTokenInput] = useState('')
+  const [memoryLogPath, setMemoryLogPath] = useState('')
 
   const hiddenScopes = useSettingsStore((s) => s.hiddenScopes)
   const scopeOrder = useSettingsStore((s) => s.scopeOrder)
@@ -95,6 +96,26 @@ export default function BottomBar({ onClose, onHeightChange }: BottomBarProps):
     setAstraTokenInput(astraState.config.token)
   }, [astraState.config.baseUrl, astraState.config.token])
 
+  useEffect(() => {
+    let disposed = false
+    void (async () => {
+      try {
+        const path = await window.electronAPI.getPerformanceMemoryLogPath()
+        if (!disposed) {
+          setMemoryLogPath(path)
+        }
+      } catch {
+        if (!disposed) {
+          setMemoryLogPath('')
+        }
+      }
+    })()
+
+    return () => {
+      disposed = true
+    }
+  }, [])
+
   useLayoutEffect(() => {
     if (!onHeightChange || !rootRef.current) return
 
@@ -440,6 +461,17 @@ export default function BottomBar({ onClose, onHeightChange }: BottomBarProps):
                 <div className="settings-status-pill bottom-bar__fps-pill" title="Docked visualizer render FPS">
                   <span>{roundedDockedRenderFps} FPS</span>
                 </div>
+
+                <button
+                  type="button"
+                  className="settings-chip"
+                  title={memoryLogPath || 'Reveal the latest memory trace CSV'}
+                  onClick={() => {
+                    void window.electronAPI.revealPerformanceMemoryLog()
+                  }}
+                >
+                  Log File
+                </button>
               </div>
 
               {memorySample ? (

src/renderer/env.d.ts

@@ -29,7 +29,7 @@ import type {
   ThemeLibrarySnapshot,
 } from '../types/theme'
 import type { ResizeDirection } from '../types/windowResize'
-import type { PerformanceMemorySnapshot } from '../types/performance'
+import type { PerformanceMemoryLogRecord, PerformanceMemorySnapshot } from '../types/performance'
 
 declare global {
   interface Window {
@@ -48,6 +48,9 @@ declare global {
       repositionWindow: (position: 'top' | 'bottom') => void
       toggleAlwaysOnTop: () => void
       isAlwaysOnTop: () => Promise<boolean>
+      getPerformanceMemoryLogPath: () => Promise<string>
+      revealPerformanceMemoryLog: () => Promise<void>
+      appendPerformanceMemoryLog: (record: PerformanceMemoryLogRecord) => Promise<void>
       getPerformanceMemorySnapshot: () => Promise<PerformanceMemorySnapshot>
       getDesktopSources: () => Promise<{ id: string; name: string }[]>
       getCaptureBackendSupport: () => Promise<CaptureBackendSupport>

src/renderer/stores/performanceStore.ts

@@ -1,6 +1,7 @@
 import { create } from 'zustand'
 import {
   isVisualizerFrameTarget,
+  type PerformanceMemoryLogRecord,
   type PerformanceMemorySnapshot,
   type VisualizerFrameTarget,
 } from '../../types/performance'
@@ -88,6 +89,17 @@ interface ChromiumPerformanceMemory {
 let memoryMonitorTimer: ReturnType<typeof setInterval> | null = null
 let memoryMonitorRefCount = 0
 let memoryMonitorInFlight = false
+let contextStoreAccessorsPromise: Promise<{
+  getAudioState: () => {
+    isCapturing: boolean
+    captureStatus: 'idle' | 'connecting' | 'capturing' | 'error'
+  }
+  getSettingsState: () => {
+    scopeOrder: string[]
+    hiddenScopes: Set<string>
+    scopePopouts: Record<string, { poppedOut?: boolean }>
+  }
+}> | null = null
 
 function isMainWindowContext(): boolean {
   if (typeof window === 'undefined') {
@@ -117,6 +129,34 @@ async function collectMemorySnapshot(): Promise<PerformanceMemorySnapshot | null
   }
 }
 
+async function getContextStoreAccessors(): Promise<{
+  getAudioState: () => {
+    isCapturing: boolean
+    captureStatus: 'idle' | 'connecting' | 'capturing' | 'error'
+  }
+  getSettingsState: () => {
+    scopeOrder: string[]
+    hiddenScopes: Set<string>
+    scopePopouts: Record<string, { poppedOut?: boolean }>
+  }
+} | null> {
+  if (typeof window === 'undefined') {
+    return null
+  }
+
+  if (!contextStoreAccessorsPromise) {
+    contextStoreAccessorsPromise = Promise.all([
+      import('./audioStore'),
+      import('./settingsStore'),
+    ]).then(([audioStoreModule, settingsStoreModule]) => ({
+      getAudioState: () => audioStoreModule.useAudioStore.getState(),
+      getSettingsState: () => settingsStoreModule.useSettingsStore.getState(),
+    }))
+  }
+
+  return contextStoreAccessorsPromise
+}
+
 async function sampleMemory(): Promise<void> {
   if (memoryMonitorInFlight) {
     return
@@ -129,6 +169,8 @@ async function sampleMemory(): Promise<void> {
       return
     }
 
+    const contextStoreAccessors = await getContextStoreAccessors()
+    let logRecord: PerformanceMemoryLogRecord | null = null
     usePerformanceStore.setState((state) => {
       const baseline = state.memoryHistory[0] ?? snapshot
       const nextHistory = [...state.memoryHistory, snapshot]
@@ -138,14 +180,41 @@ async function sampleMemory(): Promise<void> {
 
       const baselineRendererMb = baseline.rendererPrivateMb ?? baseline.rendererMb
       const currentRendererMb = snapshot.rendererPrivateMb ?? snapshot.rendererMb
+      const rendererDeltaMb = Math.round((currentRendererMb - baselineRendererMb) * 10) / 10
+      const appDeltaMb = Math.round((snapshot.appMb - baseline.appMb) * 10) / 10
+      const settingsState = contextStoreAccessors?.getSettingsState()
+      const audioState = contextStoreAccessors?.getAudioState()
+      const visibleScopes = settingsState
+        ? settingsState.scopeOrder.filter((kind) => !settingsState.hiddenScopes.has(kind))
+        : []
+      const poppedOutScopes = settingsState
+        ? settingsState.scopeOrder.filter((kind) => settingsState.scopePopouts[kind]?.poppedOut)
+        : []
+
+      logRecord = {
+        ...snapshot,
+        elapsedSeconds: Math.round(((snapshot.capturedAt - baseline.capturedAt) / 100)) / 10,
+        rendererDeltaMb,
+        appDeltaMb,
+        frameTarget: state.frameTarget,
+        dockedRenderFps: state.dockedRenderFps,
+        isCapturing: audioState?.isCapturing ?? false,
+        captureStatus: audioState?.captureStatus ?? 'idle',
+        visibleScopes,
+        poppedOutScopes,
+      }
 
       return {
         memorySample: snapshot,
         memoryHistory: nextHistory,
-        rendererMemoryDeltaMb: Math.round((currentRendererMb - baselineRendererMb) * 10) / 10,
+        rendererMemoryDeltaMb: rendererDeltaMb,
-        appMemoryDeltaMb: Math.round((snapshot.appMb - baseline.appMb) * 10) / 10,
+        appMemoryDeltaMb: appDeltaMb,
       }
     })
+
+    if (logRecord && typeof window !== 'undefined' && typeof window.electronAPI?.appendPerformanceMemoryLog === 'function') {
+      void window.electronAPI.appendPerformanceMemoryLog(logRecord)
+    }
   } finally {
     memoryMonitorInFlight = false
   }

src/types/performance.ts

@@ -14,6 +14,18 @@ export interface PerformanceMemorySnapshot {
   jsHeapLimitMb: number | null
 }
 
+export interface PerformanceMemoryLogRecord extends PerformanceMemorySnapshot {
+  elapsedSeconds: number
+  rendererDeltaMb: number
+  appDeltaMb: number
+  frameTarget: VisualizerFrameTarget
+  dockedRenderFps: number
+  isCapturing: boolean
+  captureStatus: 'idle' | 'connecting' | 'capturing' | 'error'
+  visibleScopes: string[]
+  poppedOutScopes: string[]
+}
+
 export function isVisualizerFrameTarget(value: unknown): value is VisualizerFrameTarget {
   return VISUALIZER_FRAME_TARGETS.includes(value as VisualizerFrameTarget)
 }