refactor: 架构重构 - 解耦过度耦合模块
主要改动: 1. 创建乐观更新工具函数 (optimisticUpdate.ts) - 消除 userStore.ts 中的重复代码 2. 拆分 useResponsive.ts (485行 -> 12个专注模块) - useBreakpoint: 断点检测 - useOrientation: 方向检测 - usePlatform: 平台检测 - useScreenSize: 屏幕尺寸 - useResponsiveValue: 响应式值 - useResponsiveStyle: 响应式样式 - useMediaQuery: 媒体查询 - useColumnCount: 列数计算 - useResponsiveSpacing: 响应式间距 3. 整理数据层 (Repository 层) - ApiDataSource: API数据源 - LocalDataSource: 本地数据源 - CacheDataSource: 缓存数据源 - MessageRepository: 消息仓库 4. 重构 messageManager.ts (2194行 -> 4个模块) - MessageStateManager: 状态管理 - WebSocketMessageHandler: WebSocket处理 - MessageSyncService: 消息同步 - ReadReceiptManager: 已读管理 5. 导航解耦 (MainNavigator.tsx: 1118行 -> 100行) - 创建 NavigationService 解耦层 - 拆分多个 Navigator 组件 架构改进: - 单一职责原则: 每个模块职责明确 - 依赖倒置: 通过接口解耦 - 代码复用: 工具函数可被多处使用 - 可测试性: 各模块可独立测试
This commit is contained in:
lafay
281
src/data/datasources/LocalDataSource.ts
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281
src/data/datasources/LocalDataSource.ts
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/**
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* 本地数据库数据源实现
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* 封装所有 SQLite 操作，提供统一的错误处理和事务支持
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*/
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import * as SQLite from 'expo-sqlite';
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import { ILocalDataSource, DataSourceError } from './interfaces';
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// 数据库实例管理
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let dbInstance: SQLite.SQLiteDatabase | null = null;
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let currentDbName: string | null = null;
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let writeQueue: Promise<void> = Promise.resolve();
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export interface LocalDataSourceConfig {
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dbName?: string;
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userId?: string;
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}
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export class LocalDataSource implements ILocalDataSource {
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private db: SQLite.SQLiteDatabase | null = null;
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private dbName: string;
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private initialized = false;
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constructor(config: LocalDataSourceConfig = {}) {
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// 如果提供了userId，使用用户专属数据库
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this.dbName = config.dbName || (config.userId ? `carrot_bbs_${config.userId}.db` : 'carrot_bbs.db');
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}
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/**
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* 初始化数据库连接
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*/
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async initialize(): Promise<void> {
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if (this.initialized && this.db) {
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return;
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}
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try {
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// 使用全局实例管理
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if (dbInstance && currentDbName === this.dbName) {
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this.db = dbInstance;
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this.initialized = true;
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return;
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}
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// 关闭旧连接
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if (dbInstance) {
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try {
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await dbInstance.closeAsync();
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} catch (e) {
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console.warn('关闭旧数据库连接失败:', e);
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}
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}
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// 创建新连接
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this.db = await SQLite.openDatabaseAsync(this.dbName);
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dbInstance = this.db;
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currentDbName = this.dbName;
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this.initialized = true;
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// 初始化数据库表结构
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await this.createTables();
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} catch (error) {
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this.handleError(error, 'INITIALIZE');
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}
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}
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/**
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* 创建数据库表结构
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*/
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private async createTables(): Promise<void> {
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if (!this.db) return;
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const tables = [
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// 消息表
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`CREATE TABLE IF NOT EXISTS messages (
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id TEXT PRIMARY KEY NOT NULL,
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conversationId TEXT NOT NULL,
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senderId TEXT NOT NULL,
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content TEXT,
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type TEXT DEFAULT 'text',
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isRead INTEGER DEFAULT 0,
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createdAt TEXT NOT NULL,
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seq INTEGER DEFAULT 0,
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status TEXT DEFAULT 'normal',
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segments TEXT
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)`,
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// 会话表
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`CREATE TABLE IF NOT EXISTS conversations (
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id TEXT PRIMARY KEY NOT NULL,
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participantId TEXT NOT NULL,
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lastMessageId TEXT,
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lastSeq INTEGER DEFAULT 0,
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unreadCount INTEGER DEFAULT 0,
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createdAt TEXT NOT NULL,
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updatedAt TEXT NOT NULL
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)`,
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// 会话缓存表
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`CREATE TABLE IF NOT EXISTS conversation_cache (
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id TEXT PRIMARY KEY NOT NULL,
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data TEXT NOT NULL,
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updatedAt TEXT NOT NULL
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)`,
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// 会话列表缓存表
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`CREATE TABLE IF NOT EXISTS conversation_list_cache (
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id TEXT PRIMARY KEY NOT NULL,
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data TEXT NOT NULL,
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updatedAt TEXT NOT NULL
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)`,
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// 用户缓存表
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`CREATE TABLE IF NOT EXISTS users (
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id TEXT PRIMARY KEY NOT NULL,
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data TEXT NOT NULL,
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updatedAt TEXT NOT NULL
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)`,
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// 当前登录用户缓存
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`CREATE TABLE IF NOT EXISTS current_user_cache (
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id TEXT PRIMARY KEY NOT NULL,
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data TEXT NOT NULL,
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updatedAt TEXT NOT NULL
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)`,
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// 群组缓存表
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`CREATE TABLE IF NOT EXISTS groups (
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id TEXT PRIMARY KEY NOT NULL,
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data TEXT NOT NULL,
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updatedAt TEXT NOT NULL
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)`,
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// 群成员缓存表
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`CREATE TABLE IF NOT EXISTS group_members (
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groupId TEXT NOT NULL,
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userId TEXT NOT NULL,
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data TEXT NOT NULL,
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updatedAt TEXT NOT NULL,
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PRIMARY KEY (groupId, userId)
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)`,
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];
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for (const sql of tables) {
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await this.db.execAsync(sql);
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}
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// 创建索引
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const indexes = [
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`CREATE INDEX IF NOT EXISTS idx_messages_conversationId ON messages(conversationId)`,
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`CREATE INDEX IF NOT EXISTS idx_messages_seq ON messages(seq)`,
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`CREATE INDEX IF NOT EXISTS idx_messages_conversation_seq ON messages(conversationId, seq)`,
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`CREATE INDEX IF NOT EXISTS idx_group_members_groupId ON group_members(groupId)`,
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];
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for (const sql of indexes) {
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await this.db.execAsync(sql);
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}
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}
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/**
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* 处理错误
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*/
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private handleError(error: unknown, operation: string): never {
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const message = error instanceof Error ? error.message : 'Unknown error';
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throw new DataSourceError(
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`Database ${operation} failed: ${message}`,
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'DB_ERROR',
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'LocalDataSource',
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error instanceof Error ? error : undefined
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);
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}
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/**
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* 检查数据库连接
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*/
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private ensureDb(): SQLite.SQLiteDatabase {
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if (!this.db) {
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throw new DataSourceError(
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'Database not initialized',
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'DB_NOT_INITIALIZED',
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'LocalDataSource'
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);
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}
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return this.db;
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}
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// ==================== ILocalDataSource 实现 ====================
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async query<T>(sql: string, params?: any[]): Promise<T[]> {
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try {
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const db = this.ensureDb();
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return await db.getAllAsync<T>(sql, params);
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} catch (error) {
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this.handleError(error, 'QUERY');
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}
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}
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async getFirst<T>(sql: string, params?: any[]): Promise<T | null> {
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try {
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const db = this.ensureDb();
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return await db.getFirstAsync<T>(sql, params);
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} catch (error) {
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this.handleError(error, 'GET_FIRST');
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}
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}
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async execute(sql: string, params?: any[]): Promise<void> {
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try {
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const db = this.ensureDb();
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await db.execAsync(sql);
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} catch (error) {
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this.handleError(error, 'EXECUTE');
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}
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}
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async run(sql: string, params?: any[]): Promise<{ lastInsertRowId: number; changes: number }> {
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try {
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const db = this.ensureDb();
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return await db.runAsync(sql, params);
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} catch (error) {
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this.handleError(error, 'RUN');
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}
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}
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async transaction(operations: () => Promise<void>): Promise<void> {
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try {
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const db = this.ensureDb();
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await db.withTransactionAsync(async () => {
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await operations();
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});
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} catch (error) {
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this.handleError(error, 'TRANSACTION');
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}
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}
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async batch(operations: (db: ILocalDataSource) => Promise<void>): Promise<void> {
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try {
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await this.transaction(async () => {
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await operations(this);
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});
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} catch (error) {
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this.handleError(error, 'BATCH');
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}
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}
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// ==================== 队列写入支持 ====================
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/**
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* 使用队列执行写入操作（避免并发写入冲突）
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*/
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async enqueueWrite<T>(operation: () => Promise<T>): Promise<T> {
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const wrappedOperation = async () => {
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try {
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return await operation();
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} catch (error) {
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// 尝试重连后重试
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if (this.isRecoverableError(error)) {
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console.error('数据库写入异常，尝试重连后重试:', error);
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this.db = null;
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dbInstance = null;
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await this.initialize();
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return operation();
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}
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throw error;
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}
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};
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const queued = writeQueue.then(wrappedOperation, wrappedOperation);
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writeQueue = queued.then(() => undefined, () => undefined);
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return queued;
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}
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/**
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* 判断错误是否可恢复
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*/
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private isRecoverableError(error: unknown): boolean {
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const message = String(error);
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return (
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message.includes('NativeDatabase.prepareAsync') ||
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message.includes('NullPointerException') ||
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message.includes('database is locked')
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);
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}
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}
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// 导出单例实例
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export const localDataSource = new LocalDataSource();
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