docs: Document current Expo architecture for native migration
- Document technology stack (Expo, TypeScript, Zustand, SQLite) - Map out all data models and types - Document service dependencies and architecture - Create component dependency diagrams - Document data flow for feed sync and search - Provide migration checklist with priorities - Identify pure TypeScript vs native-dependent services This analysis provides the foundation for migrating business logic from Expo/TypeScript to native platforms (iOS, Android, Linux).
This commit is contained in:
@@ -17,6 +17,8 @@
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"@react-navigation/native": "^7.1.33",
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"@tanstack/react-query": "^5.95.2",
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"axios": "^1.14.0",
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"buffer": "^6.0.3",
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"events": "^3.3.0",
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"expo": "55.0.10-canary-20260328-2049187",
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"expo-constants": "55.0.10-canary-20260328-2049187",
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"expo-device": "55.0.11-canary-20260328-2049187",
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@@ -34,6 +36,7 @@
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"expo-system-ui": "55.0.12-canary-20260328-2049187",
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"expo-task-manager": "55.0.11-canary-20260328-2049187",
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"expo-web-browser": "55.0.11-canary-20260328-2049187",
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"fast-xml-parser": "^5.5.9",
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"react": "19.2.0",
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"react-dom": "19.2.0",
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"react-native": "0.83.4",
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@@ -44,7 +47,7 @@
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"react-native-screens": "~4.23.0",
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"react-native-web": "~0.21.0",
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"react-native-worklets": "0.7.2",
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"xml2js": "^0.6.2",
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"stream-browserify": "^3.0.0",
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"zustand": "^5.0.12"
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},
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"devDependencies": {
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@@ -0,0 +1,623 @@
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# 01. Analyze and document current Expo architecture
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meta:
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id: native-business-logic-migration-01
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feature: native-business-logic-migration
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priority: P0
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depends_on: []
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tags: [analysis, documentation]
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objective:
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- Document the current Expo/TypeScript architecture to understand what needs to be migrated
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deliverables:
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- Architecture documentation file
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- Component dependency diagram
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- Data flow diagrams
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- List of all services, stores, and utilities to migrate
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steps:
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- Review all TypeScript source files in src/
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- Identify all data models and types
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- Map out service dependencies
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- Document state management flow (Zustand stores)
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- Identify database schema and queries
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- Document API endpoints and network calls
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- Create migration checklist
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acceptance_criteria:
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- Architecture document exists with all components listed
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- Data flow diagrams created for key features
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- Migration checklist complete with all items identified
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- All services and their dependencies documented
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notes:
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- Focus on business logic, not UI components
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- Pay attention to async operations and error handling
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- Document any platform-specific code that needs special handling
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---
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# Current Architecture Analysis
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## Overview
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RSSuper is a multi-platform RSS reader built with **Expo (React Native)** using **TypeScript**. The current architecture follows a service-oriented pattern with Zustand for state management and expo-sqlite for local persistence.
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## Technology Stack
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| Layer | Technology |
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|-------|------------|
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| Framework | Expo SDK 55 (canary) |
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| Runtime | React Native 0.83.4 |
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| Language | TypeScript 5.9 |
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| State Management | Zustand 5.x |
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| Data Fetching | TanStack Query 5.x |
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| HTTP Client | Axios |
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| Local Database | expo-sqlite |
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| Navigation | React Navigation 7.x |
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| XML Parsing | fast-xml-parser |
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| Audio | expo-av |
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---
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## Data Models
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### Core Types (`src/types/feed.ts`)
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```
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FeedItem
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├── id: string
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├── title: string
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├── link?: string
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├── description?: string
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├── content?: string
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├── author?: string
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├── published?: Date
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├── updated?: Date
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├── categories?: string[]
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├── enclosure?: { url, type, length? }
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└── guid?: string
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Feed
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├── id: string
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├── title: string
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├── link?: string
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├── description?: string
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├── subtitle?: string
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├── language?: string
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├── lastBuildDate?: Date
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├── updated?: Date
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├── generator?: string
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├── ttl?: number
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├── items: FeedItem[]
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├── rawUrl: string
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├── lastFetchedAt?: Date
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└── nextFetchAt?: Date
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FeedSubscription
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├── id: string
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├── url: string
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├── title: string
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├── category?: string
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├── enabled: boolean
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├── fetchInterval: number (minutes)
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├── createdAt: Date
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├── updatedAt: Date
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├── lastFetchedAt?: Date
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├── nextFetchAt?: Date
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├── error?: string
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└── httpAuth?: { username, password }
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SearchQuery / SearchFilters / SearchResult
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```
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### Global Types (`src/types/global.d.ts`)
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```
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NotificationType (enum)
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├── NEW_ARTICLE
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├── EPISODE_RELEASE
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├── CUSTOM_ALERT
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└── UPGRADE_PROMO
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NotificationConfig
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AccountSettings
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PushNotificationConfig
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```
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---
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## Services Architecture
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### 1. Feed Service (`src/services/feed-service.ts`)
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**Responsibilities**: RSS/Atom feed parsing and fetching
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```
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Functions:
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├── parseFeed(url, data) → ParseResult
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├── fetchFeed(url, auth?) → ParseResult
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└── fetchFeeds(subscriptions) → Map<string, ParseResult>
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Dependencies:
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├── axios (HTTP)
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└── xml2js (XML parsing)
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Platform: Pure TypeScript - NO native dependencies
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```
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### 2. Database Service (`src/services/database.ts`)
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**Responsibilities**: SQLite persistence layer
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```
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Tables:
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├── subscriptions
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│ ├── id (PRIMARY KEY)
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│ ├── url (UNIQUE)
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│ ├── title, category
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│ ├── enabled, fetch_interval
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│ ├── http_auth_username, http_auth_password
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│ ├── timestamps (created_at, updated_at, last_fetched_at, next_fetch_at)
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│ └── error
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│
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├── feeds
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│ ├── id (PRIMARY KEY)
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│ ├── subscription_id (FOREIGN KEY)
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│ ├── title, link, description, author
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│ ├── published, updated, content
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│ ├── guid (UNIQUE)
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│ └── created_at
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│
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├── feeds_fts (FTS5 virtual table)
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├── subscriptions_fts (FTS5 virtual table)
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└── search_history
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Functions:
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├── initDatabase() → void
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├── saveSubscription(sub) → void
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├── getSubscription(id) → FeedSubscription
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├── getAllSubscriptions() → FeedSubscription[]
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├── deleteSubscription(id) → void
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├── saveFeedItems(subscriptionId, items) → void
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├── getFeedItems(subscriptionId?, limit, offset) → FeedItem[]
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├── getAllFeedItems(limit, offset) → FeedItem[]
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└── search history functions
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Dependencies: expo-sqlite
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```
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### 3. Search Service (`src/services/search-service.ts`)
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**Responsibilities**: Full-text search using SQLite FTS5
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```
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Functions:
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├── searchArticles(query, options) → SearchResult[]
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├── searchFeeds(query, limit) → SearchResult[]
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└── combinedSearch(query, options) → { articles, feeds }
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Search Features:
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├── FTS5 full-text search (primary)
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├── LIKE fallback search
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├── Date filters
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├── Feed filters
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├── Author filters
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├── Content type filters
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└── Multiple sort options
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Dependencies: database service
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```
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### 4. Sync Service (`src/services/sync-service.ts`)
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**Responsibilities**: Feed synchronization orchestration
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```
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Functions:
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├── syncFeed(subscription) → { success, itemsSynced }
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├── syncAllFeeds() → { success, totalItemsSynced }
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├── getFeedsDueForSync() → FeedSubscription[]
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├── getLocalFeedItems(...) → FeedItem[]
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├── getAllLocalFeedItems(limit) → FeedItem[]
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├── hasLocalData() → boolean
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└── resolveConflict(options) → FeedItem
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Conflict Resolution Strategies:
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├── newer
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├── older
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├── local
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└── remote
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Dependencies: feed-service, database, feed-store
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```
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### 5. Background Sync Service (`src/services/background-sync.ts`)
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**Responsibilities**: Background task management
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```
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Task: BACKGROUND_SYNC_TASK
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├── Uses expo-task-manager
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├── Registers background fetch task
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└── Syncs all enabled feeds
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Functions:
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├── registerBackgroundSync() → boolean
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├── unregisterBackgroundSync() → void
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└── isBackgroundSyncRegistered() → boolean
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Dependencies: expo-task-manager, sync-service, feed-store
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```
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### 6. Notification Service (`src/services/notification-service.ts`)
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**Responsibilities**: Push and local notifications
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```
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Functions:
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├── registerNotificationChannels() → void (Android)
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├── requestNotificationPermissions() → boolean
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├── getPermissionStatus() → status
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├── scheduleNotification(config) → string | null
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├── scheduleNotificationAtTime(config, date) → string | null
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├── cancelNotification(id) → void
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├── cancelAllNotifications() → void
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├── getScheduledNotifications() → NotificationRequest[]
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├── showNotification(config) → void
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├── setBadgeCount(count) → void
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├── getBadgeCount() → number
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├── addNotificationListener(callback) → unsubscribe
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└── addNotificationResponseListener(callback) → unsubscribe
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Android Channels:
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├── default
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├── new-articles
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├── episode-releases
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└── custom-alerts
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Dependencies: expo-notifications, settings-store
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```
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### 7. Audio Player Service (`src/services/audio-player.ts`)
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**Responsibilities**: Podcast/audio playback
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```
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Class: AudioPlayerService
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├── initialize() → void
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├── subscribe(callback) → unsubscribe
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├── play(item) → void
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├── pause() → void
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├── resume() → void
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├── stop() → void
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├── seekTo(positionMs) → void
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├── setPlaybackSpeed(speed) → void
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├── skipForward(seconds) → void
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├── skipBackward(seconds) → void
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└── getState() → PlayerState
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Playback States: idle | loading | playing | paused | error
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Playback Speeds: 0.5 | 0.75 | 1 | 1.25 | 1.5 | 1.75 | 2
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Dependencies: expo-av
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```
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### 8. API Service (`src/services/api.ts`)
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**Responsibilities**: HTTP client setup (currently minimal)
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```
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Setup:
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├── Axios instance with baseURL
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├── Request interceptor (auth token placeholder)
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└── Response interceptor (error handling)
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Note: Not actively used - TODO for future cloud sync
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```
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---
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## State Management (Zustand Stores)
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### 1. Feed Store (`src/stores/feed-store.ts`)
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```
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State:
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├── subscriptions: FeedSubscription[]
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├── feedItems: FeedItem[]
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├── loading: boolean
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└── error: string | null
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Actions:
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├── addSubscription(subscription) → Promise<void>
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├── updateSubscription(id, updates) → void
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├── removeSubscription(id) → Promise<void>
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├── loadSubscriptions() → Promise<void>
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├── loadFeedItems(subscriptionId?, limit?, offset?) → Promise<void>
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├── setLoading(loading) → void
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├── setError(error) → void
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└── clearError() → void
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```
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### 2. Settings Store (`src/stores/settings-store.ts`)
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```
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State:
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├── syncInterval: SyncInterval
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├── theme: 'system' | 'light' | 'dark'
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├── notificationPreferences: NotificationPreferences
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├── readingPreferences: ReadingPreferences
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└── accountSettings: AccountSettings
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Actions:
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├── setSyncInterval(interval) → void
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├── setTheme(theme) → void
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├── setNotificationPreferences(prefs) → void
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├── setReadingPreferences(prefs) → void
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├── setAccountSettings(settings) → void
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└── resetSettings() → void
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Persistence: AsyncStorage (via zustand persist)
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Storage Key: rssuper-settings
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```
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### 3. Bookmark Store (`src/stores/bookmark-store.ts`)
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```
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State:
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└── bookmarkedIds: Set<string>
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Actions:
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├── addBookmark(articleId) → void
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├── removeBookmark(articleId) → void
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├── toggleBookmark(articleId) → void
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├── isBookmarked(articleId) → boolean
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└── getBookmarks() → string[]
|
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Persistence: AsyncStorage (via zustand persist)
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Storage Key: rssuper-bookmarks
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```
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### 4. Search Store (`src/stores/search-store.ts`)
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```
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State:
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├── query: string
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├── filters: SearchFilters
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├── sort: SearchSortOption
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├── page: number
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├── pageSize: number
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├── loading: boolean
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├── error: string | null
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└── searchHistory: SearchHistoryItem[]
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||||
|
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Actions:
|
||||
├── setQuery(query) → void
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├── setFilters(filters) → void
|
||||
├── setSort(sort) → void
|
||||
├── setPage(page) → void
|
||||
├── setLoading(loading) → void
|
||||
├── setError(error) → void
|
||||
├── clearSearch() → void
|
||||
├── addToHistory(query) → Promise<void>
|
||||
├── loadHistory() → Promise<void>
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||||
├── clearHistory() → Promise<void>
|
||||
├── removeFromHistory(query) → Promise<void>
|
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└── resetSearch() → void
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Component Dependencies
|
||||
|
||||
```
|
||||
┌─────────────────────────────────────────────────────────────────────────┐
|
||||
│ UI Components │
|
||||
│ (feed-item-card, article-card, search-filters, etc.) │
|
||||
└─────────────────────────────────────────────────────────────────────────┘
|
||||
│
|
||||
▼
|
||||
┌─────────────────────────────────────────────────────────────────────────┐
|
||||
│ React Hooks │
|
||||
│ use-feed-list, use-theme, use-color-scheme, use-offline │
|
||||
└─────────────────────────────────────────────────────────────────────────┘
|
||||
│
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||||
▼
|
||||
┌─────────────────────────────────────────────────────────────────────────┐
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||||
│ Zustand Stores │
|
||||
│ feed-store, settings-store, bookmark-store, search-store │
|
||||
└─────────────────────────────────────────────────────────────────────────┘
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||||
│ │ │ │
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||||
▼ ▼ ▼ ▼
|
||||
┌─────────────────────────────────────────────────────────────────────────┐
|
||||
│ Services Layer │
|
||||
│ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ┌───────────┐ │
|
||||
│ │feed-service │ │search-service│ │ sync-service │ │ api.ts │ │
|
||||
│ └──────────────┘ └──────────────┘ └──────────────┘ └───────────┘ │
|
||||
│ ┌──────────────────────┐ ┌──────────────────────┐ │
|
||||
│ │background-sync.ts │ │notification-service │ │
|
||||
│ └──────────────────────┘ └──────────────────────┘ │
|
||||
└─────────────────────────────────────────────────────────────────────────┘
|
||||
│ │
|
||||
▼ ▼
|
||||
┌─────────────────────────────────────────────────────────────────────────┐
|
||||
│ Data Layer │
|
||||
│ ┌──────────────────────────────────────────────────────────────────┐ │
|
||||
│ │ database.ts (expo-sqlite) │ │
|
||||
│ │ - subscriptions table │ │
|
||||
│ │ - feeds table │ │
|
||||
│ │ - FTS5 virtual tables │ │
|
||||
│ │ - search_history table │ │
|
||||
│ └──────────────────────────────────────────────────────────────────┘ │
|
||||
└─────────────────────────────────────────────────────────────────────────┘
|
||||
│
|
||||
▼
|
||||
┌─────────────────────────────────────────────────────────────────────────┐
|
||||
│ Expo Modules (Native) │
|
||||
│ expo-sqlite, expo-task-manager, expo-notifications, expo-av │
|
||||
└─────────────────────────────────────────────────────────────────────────┘
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Data Flow Diagrams
|
||||
|
||||
### Feed Sync Flow
|
||||
|
||||
```
|
||||
User adds subscription
|
||||
│
|
||||
▼
|
||||
┌───────────────────┐
|
||||
│ feed-store │
|
||||
│ addSubscription() │
|
||||
└─────────┬─────────┘
|
||||
│
|
||||
▼
|
||||
┌───────────────────┐ ┌───────────────────┐
|
||||
│ database.ts │ │ settings-store │
|
||||
│ saveSubscription()│ │ (check intervals) │
|
||||
└─────────┬─────────┘ └───────────────────┘
|
||||
│
|
||||
▼ (manual or background)
|
||||
┌───────────────────┐
|
||||
│ sync-service │
|
||||
│ syncFeed() │
|
||||
└─────────┬─────────┘
|
||||
│
|
||||
▼
|
||||
┌───────────────────┐ ┌───────────────────┐
|
||||
│ feed-service │ │ feed-store │
|
||||
│ fetchFeed() │ │ updateSubscription│
|
||||
│ parseFeed() │ └─────────┬─────────┘
|
||||
└─────────┬─────────┘ │
|
||||
│ ▼
|
||||
│ ┌───────────────────┐
|
||||
│ │ database.ts │
|
||||
│ │ saveFeedItems() │
|
||||
│ └─────────┬─────────┘
|
||||
│ │
|
||||
▼ ▼
|
||||
┌───────────────────┐ ┌───────────────────┐
|
||||
│ axios.get() │ │ UI updates │
|
||||
│ (HTTP request) │ │ via Zustand │
|
||||
└───────────────────┘ └───────────────────┘
|
||||
```
|
||||
|
||||
### Search Flow
|
||||
|
||||
```
|
||||
User enters search query
|
||||
│
|
||||
▼
|
||||
┌───────────────────┐
|
||||
│ search-store │
|
||||
│ setQuery() │
|
||||
└─────────┬─────────┘
|
||||
│
|
||||
▼
|
||||
┌───────────────────┐
|
||||
│ search-service │
|
||||
│ searchArticles() │
|
||||
└─────────┬─────────┘
|
||||
│
|
||||
▼
|
||||
┌───────────────────┐ ┌───────────────────┐
|
||||
│ database.ts │ │ FTS5 or LIKE │
|
||||
│ getDb() │────▶│ fallback search │
|
||||
└─────────┬─────────┘ └───────────────────┘
|
||||
│
|
||||
▼
|
||||
┌───────────────────┐
|
||||
│ SearchResult[] │
|
||||
└─────────┬─────────┘
|
||||
│
|
||||
▼
|
||||
┌───────────────────┐
|
||||
│ UI renders │
|
||||
│ search-results │
|
||||
└───────────────────┘
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Migration Checklist
|
||||
|
||||
### Services to Migrate (Pure TypeScript)
|
||||
|
||||
| Service | File | Native Deps | Priority |
|
||||
|---------|------|-------------|----------|
|
||||
| Feed Service | `feed-service.ts` | None | P0 |
|
||||
| Search Service | `search-service.ts` | None | P0 |
|
||||
| Sync Service | `sync-service.ts` | None | P0 |
|
||||
| API Service | `api.ts` | None | P1 |
|
||||
|
||||
### Services with Native Dependencies
|
||||
|
||||
| Service | File | Native Deps | Priority |
|
||||
|---------|------|-------------|----------|
|
||||
| Database | `database.ts` | expo-sqlite | P0 |
|
||||
| Background Sync | `background-sync.ts` | expo-task-manager | P0 |
|
||||
| Notifications | `notification-service.ts` | expo-notifications | P0 |
|
||||
| Audio Player | `audio-player.ts` | expo-av | P1 |
|
||||
|
||||
### Stores to Migrate
|
||||
|
||||
| Store | File | Persistence | Priority |
|
||||
|-------|------|-------------|----------|
|
||||
| Feed Store | `feed-store.ts` | None | P0 |
|
||||
| Settings Store | `settings-store.ts` | AsyncStorage | P0 |
|
||||
| Bookmark Store | `bookmark-store.ts` | AsyncStorage | P0 |
|
||||
| Search Store | `search-store.ts` | None | P0 |
|
||||
|
||||
### Types to Migrate
|
||||
|
||||
| Types | File | Priority |
|
||||
|-------|------|----------|
|
||||
| Feed Types | `types/feed.ts` | P0 |
|
||||
| Global Types | `types/global.d.ts` | P0 |
|
||||
|
||||
---
|
||||
|
||||
## Key Findings
|
||||
|
||||
1. **Pure TypeScript Services** (can be shared across all platforms):
|
||||
- Feed parsing (RSS/Atom)
|
||||
- Search logic
|
||||
- Sync orchestration
|
||||
- Conflict resolution
|
||||
|
||||
2. **Native Module Dependencies**:
|
||||
- `expo-sqlite` → SQLite database
|
||||
- `expo-task-manager` → Background tasks
|
||||
- `expo-notifications` → Push/local notifications
|
||||
- `expo-av` → Audio playback
|
||||
|
||||
3. **State Management**:
|
||||
- All stores use Zustand
|
||||
- Settings and bookmarks persist to AsyncStorage
|
||||
- Database serves as source of truth for feeds/subscriptions
|
||||
|
||||
4. **Error Handling**:
|
||||
- Most services return `{ success: boolean; error?: string }`
|
||||
- Try-catch blocks with meaningful error messages
|
||||
- Fallback strategies (e.g., FTS → LIKE search)
|
||||
|
||||
5. **Platform-Specific Code**:
|
||||
- `hooks/use-color-scheme.web.ts` - Web-specific color scheme
|
||||
- `components/animated-icon.web.tsx` - Web-specific icon animation
|
||||
- `components/app-tabs.web.tsx` - Web-specific tabs
|
||||
|
||||
---
|
||||
|
||||
## Migration Priorities
|
||||
|
||||
1. **Phase 1**: Data models and types (shared)
|
||||
2. **Phase 2**: Pure TypeScript services (feed, search, sync)
|
||||
3. **Phase 3**: Database layer with expo-sqlite
|
||||
4. **Phase 4**: Background sync with expo-task-manager
|
||||
5. **Phase 5**: Notifications with expo-notifications
|
||||
6. **Phase 6**: Audio player with expo-av
|
||||
7. **Phase 7**: State management integration
|
||||
Reference in New Issue
Block a user