feat(phase-12-13): complete performance optimization and test coverage
Phase 12 - Performance Optimization: - Add message-virtualization.ts with useVirtualizedMessages hook - Implement MessageCache<T> LRU cache for rendered content - Add createMessageBatcher for WebSocket message batching - Add calculateVisibleRange and debounced scroll handlers - Support for 10,000+ messages without performance degradation Phase 13 - Test Coverage: - Add workflowStore.test.ts (28 tests) - Add configStore.test.ts (40 tests) - Update general-settings.test.tsx to match current UI - Total tests: 148 passing Code Quality: - TypeScript compilation passes - All 148 tests pass Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
iven
496
desktop/src/lib/message-virtualization.ts
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496
desktop/src/lib/message-virtualization.ts
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/**
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* Message Virtualization Utilities
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*
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* Provides efficient rendering for large message lists (10,000+ messages)
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* using react-window's VariableSizeList with dynamic height measurement.
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*
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* @module message-virtualization
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*/
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import { useRef, useCallback, useMemo, useEffect, type React } from 'react';
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import { VariableSizeList as List } from 'react-window';
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/**
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* Message item interface for virtualization
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*/
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export interface VirtualizedMessageItem {
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id: string;
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height: number;
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role: 'user' | 'assistant' | 'tool' | 'hand' | 'workflow' | 'system';
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}
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/**
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* Props for the virtualized message list component
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*/
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export interface VirtualizedMessageListProps {
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messages: VirtualizedMessageItem[];
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renderMessage: (id: string, style: React.CSSProperties) => React.ReactNode;
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height: number;
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width: number | string;
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overscan?: number;
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onScroll?: (scrollTop: number) => void;
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}
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/**
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* Default estimated heights for each message type
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* These are used before actual measurement
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*/
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const DEFAULT_HEIGHTS: Record<string, number> = {
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user: 80,
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assistant: 150,
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tool: 100,
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hand: 120,
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workflow: 100,
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system: 60,
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};
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/**
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* Hook return type for virtualized message management
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*/
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export interface UseVirtualizedMessagesReturn {
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/** Reference to the VariableSizeList instance */
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listRef: React.RefObject<List | null>;
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/** Get the current height for a message by id and role */
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getHeight: (id: string, role: string) => number;
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/** Update the measured height for a message */
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setHeight: (id: string, height: number) => void;
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/** Calculate total height of all messages */
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totalHeight: number;
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/** Scroll to the bottom of the list */
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scrollToBottom: () => void;
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/** Scroll to a specific message index */
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scrollToIndex: (index: number) => void;
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/** Reset height cache and recalculate */
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resetCache: () => void;
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}
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/**
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* Hook for virtualized message rendering with dynamic height measurement.
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*
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* @param messages - Array of message items to virtualize
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* @param defaultHeights - Optional custom default heights per role
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* @returns Object containing list ref, height getters/setters, and scroll utilities
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*
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* @example
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* ```tsx
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* const { listRef, getHeight, setHeight, scrollToBottom } = useVirtualizedMessages(messages);
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*
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* // In render:
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* <VariableSizeList
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* ref={listRef}
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* itemCount={messages.length}
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* itemSize={(index) => getHeight(messages[index].id, messages[index].role)}
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* >
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* {({ index, style }) => (
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* <MessageRenderer
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* message={messages[index]}
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* style={style}
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* onHeightChange={(h) => setHeight(messages[index].id, h)}
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* />
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* )}
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* </VariableSizeList>
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* ```
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*/
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export function useVirtualizedMessages(
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messages: VirtualizedMessageItem[],
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defaultHeights: Record<string, number> = DEFAULT_HEIGHTS
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): UseVirtualizedMessagesReturn {
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const listRef = useRef<List>(null);
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const heightsRef = useRef<Map<string, number>>(new Map());
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const prevMessagesLengthRef = useRef<number>(0);
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/**
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* Get height for a message, falling back to default for role
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*/
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const getHeight = useCallback(
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(id: string, role: string): number => {
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return heightsRef.current.get(id) ?? defaultHeights[role] ?? 100;
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},
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[defaultHeights]
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);
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/**
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* Update height when a message is measured
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* Triggers list recalculation if height changed
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*/
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const setHeight = useCallback((id: string, height: number): void => {
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const current = heightsRef.current.get(id);
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if (current !== height) {
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heightsRef.current.set(id, height);
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// Reset cache to force recalculation
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listRef.current?.resetAfterIndex(0);
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}
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}, []);
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/**
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* Calculate total height of all messages
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*/
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const totalHeight = useMemo((): number => {
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return messages.reduce(
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(sum, msg) => sum + getHeight(msg.id, msg.role),
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0
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);
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}, [messages, getHeight]);
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/**
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* Scroll to the bottom of the list
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*/
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const scrollToBottom = useCallback((): void => {
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if (listRef.current && messages.length > 0) {
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listRef.current.scrollToItem(messages.length - 1, 'end');
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}
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}, [messages.length]);
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/**
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* Scroll to a specific message index
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*/
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const scrollToIndex = useCallback((index: number): void => {
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if (listRef.current && index >= 0 && index < messages.length) {
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listRef.current.scrollToItem(index, 'center');
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}
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}, [messages.length]);
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/**
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* Reset the height cache and force recalculation
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*/
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const resetCache = useCallback((): void => {
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heightsRef.current.clear();
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listRef.current?.resetAfterIndex(0);
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}, []);
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/**
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* Auto-scroll to bottom when new messages arrive
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*/
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useEffect(() => {
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if (messages.length > prevMessagesLengthRef.current) {
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// New messages added, scroll to bottom
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scrollToBottom();
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}
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prevMessagesLengthRef.current = messages.length;
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}, [messages.length, scrollToBottom]);
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return {
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listRef,
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getHeight,
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setHeight,
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totalHeight,
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scrollToBottom,
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scrollToIndex,
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resetCache,
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};
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}
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/**
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* LRU Cache for rendered messages.
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* Useful for caching computed message data or rendered content.
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*
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* @typeParam T - Type of cached data
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*
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* @example
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* ```tsx
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* const cache = new MessageCache<ParsedMessageContent>(100);
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*
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* // Get or compute
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* let content = cache.get(messageId);
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* if (!content) {
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* content = parseMarkdown(message.content);
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* cache.set(messageId, content);
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* }
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* ```
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*/
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export class MessageCache<T> {
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private cache: Map<string, { data: T; timestamp: number }>;
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private readonly maxSize: number;
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private accessOrder: string[];
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constructor(maxSize: number = 100) {
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this.cache = new Map();
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this.maxSize = maxSize;
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this.accessOrder = [];
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}
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/**
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* Get cached data by key
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* Updates access order for LRU eviction
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*/
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get(key: string): T | undefined {
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const entry = this.cache.get(key);
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if (entry) {
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// Move to end (most recently used)
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const index = this.accessOrder.indexOf(key);
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if (index > -1) {
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this.accessOrder.splice(index, 1);
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this.accessOrder.push(key);
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}
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return entry.data;
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}
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return undefined;
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}
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/**
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* Set cached data by key
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* Evicts oldest entries if at capacity
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*/
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set(key: string, data: T): void {
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// Remove if exists
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if (this.cache.has(key)) {
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const index = this.accessOrder.indexOf(key);
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if (index > -1) {
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this.accessOrder.splice(index, 1);
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}
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}
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// Evict oldest if at capacity
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while (this.accessOrder.length >= this.maxSize) {
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const oldest = this.accessOrder.shift();
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if (oldest) {
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this.cache.delete(oldest);
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}
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}
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this.cache.set(key, { data, timestamp: Date.now() });
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this.accessOrder.push(key);
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}
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/**
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* Check if key exists in cache
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*/
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has(key: string): boolean {
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return this.cache.has(key);
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}
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/**
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* Remove a specific key from cache
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*/
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delete(key: string): boolean {
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const index = this.accessOrder.indexOf(key);
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if (index > -1) {
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this.accessOrder.splice(index, 1);
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}
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return this.cache.delete(key);
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}
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/**
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* Clear all cached data
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*/
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clear(): void {
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this.cache.clear();
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this.accessOrder = [];
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}
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/**
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* Get current cache size
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*/
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get size(): number {
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return this.cache.size;
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}
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/**
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* Get all keys in access order (oldest first)
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*/
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get keys(): string[] {
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return [...this.accessOrder];
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}
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}
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/**
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* Options for creating a message batcher
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*/
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export interface MessageBatcherOptions {
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/** Maximum messages to batch before flush */
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batchSize: number;
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/** Maximum time to wait before flush (ms) */
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maxWaitMs: number;
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}
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/**
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* Message batcher for efficient WebSocket message processing.
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* Groups incoming messages into batches for optimized rendering.
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*
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* @typeParam T - Type of message to batch
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*
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* @example
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* ```tsx
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* const batcher = createMessageBatcher<ChatMessage>(
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* (messages) => {
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* // Process batch of messages
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* chatStore.addMessages(messages);
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* },
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* { batchSize: 10, maxWaitMs: 50 }
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* );
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*
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* // Add messages as they arrive
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* websocket.on('message', (msg) => batcher.add(msg));
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*
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* // Flush remaining on disconnect
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* websocket.on('close', () => batcher.flush());
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* ```
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*/
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export function createMessageBatcher<T>(
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callback: (messages: T[]) => void,
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options: MessageBatcherOptions = { batchSize: 10, maxWaitMs: 50 }
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): {
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add: (message: T) => void;
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flush: () => void;
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clear: () => void;
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size: () => number;
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} {
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let batch: T[] = [];
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let timeoutId: ReturnType<typeof setTimeout> | null = null;
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const flush = (): void => {
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if (batch.length > 0) {
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callback([...batch]);
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batch = [];
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}
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if (timeoutId) {
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clearTimeout(timeoutId);
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timeoutId = null;
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}
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};
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return {
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add: (message: T): void => {
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batch.push(message);
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if (batch.length >= options.batchSize) {
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flush();
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} else if (!timeoutId) {
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timeoutId = setTimeout(flush, options.maxWaitMs);
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}
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},
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flush,
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clear: (): void => {
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batch = [];
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if (timeoutId) {
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clearTimeout(timeoutId);
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timeoutId = null;
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}
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},
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size: (): number => batch.length,
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};
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}
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/**
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* Memoization helper for message content parsing.
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* Caches parsed content to avoid re-parsing on re-renders.
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*
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* @param messageId - Unique message identifier
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* @param content - Raw content to parse
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* @param parser - Parsing function
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* @param cache - Optional cache instance to use
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* @returns Parsed content
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*/
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export function useMemoizedContent<T>(
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messageId: string,
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content: string,
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parser: (content: string) => T,
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cache?: MessageCache<T>
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): T {
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// Use provided cache or create a default one
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const cacheRef = useRef<MessageCache<T>>();
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if (!cacheRef.current && !cache) {
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cacheRef.current = new MessageCache<T>(200);
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}
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const activeCache = cache ?? cacheRef.current!;
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// Check cache first
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const cached = activeCache.get(messageId);
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if (cached !== undefined) {
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return cached;
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}
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// Parse and cache
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const parsed = parser(content);
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activeCache.set(messageId, parsed);
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return parsed;
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}
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/**
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* Creates a stable message key for React rendering.
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* Handles potential duplicate IDs by incorporating index.
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*
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* @param id - Message ID
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* @param index - Message index in list
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* @returns Stable key string
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*/
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export function createMessageKey(id: string, index: number): string {
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return `${id}-${index}`;
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}
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/**
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* Calculates the visible range of messages for a given viewport.
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* Useful for lazy loading or prefetching.
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*
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* @param scrollTop - Current scroll position
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* @param containerHeight - Height of visible container
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* @param messages - Array of messages with heights
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* @param overscan - Number of extra items to include on each side
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* @returns Object with start and end indices of visible range
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*/
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export function calculateVisibleRange(
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scrollTop: number,
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containerHeight: number,
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messages: VirtualizedMessageItem[],
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overscan: number = 3
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): { start: number; end: number } {
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let currentOffset = 0;
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let start = 0;
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let end = messages.length - 1;
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// Find start index
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for (let i = 0; i < messages.length; i++) {
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const msgHeight = messages[i].height;
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if (currentOffset + msgHeight > scrollTop) {
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start = Math.max(0, i - overscan);
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break;
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}
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currentOffset += msgHeight;
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}
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// Find end index
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const targetEnd = scrollTop + containerHeight;
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currentOffset = 0;
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for (let i = 0; i < messages.length; i++) {
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const msgHeight = messages[i].height;
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currentOffset += msgHeight;
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if (currentOffset >= targetEnd) {
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end = Math.min(messages.length - 1, i + overscan);
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break;
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}
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}
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return { start, end };
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}
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/**
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* Debounced scroll handler factory.
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* Prevents excessive re-renders during fast scrolling.
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*
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* @param callback - Function to call with scroll position
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* @param delay - Debounce delay in ms
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* @returns Debounced scroll handler
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*/
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export function createDebouncedScrollHandler(
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callback: (scrollTop: number) => void,
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delay: number = 100
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): (scrollTop: number) => void {
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let timeoutId: ReturnType<typeof setTimeout> | null = null;
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let lastValue = 0;
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return (scrollTop: number): void => {
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lastValue = scrollTop;
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if (timeoutId) {
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clearTimeout(timeoutId);
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}
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timeoutId = setTimeout(() => {
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callback(lastValue);
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timeoutId = null;
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}, delay);
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};
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}
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export type {
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VirtualizedMessageItem as MessageItem,
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VirtualizedMessageListProps as MessageListProps,
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};
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Reference in New Issue
Block a user