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Book Search MVP - Current Status (2026-03-31)

⚠️ **归档文档 — 数据已过时** 本报告为历史快照存档。当前版本 **v1.3.0-dev**，232 测试通过。 👉 最新工程状态请参阅 **[ENGINEERING_ALIGNMENT.md](ENGINEERING_ALIGNMENT.md)**

Overview

Book search functionality integration is 90% complete but blocked by a middleware/security issue that's rejecting HTTP requests before they reach the route handlers.

What's Working ✅

1. Database (100% Complete)

  • PostgreSQL 16 with pgvector extension configured
  • Tables created: books, book_chapters, data_sources, user_bookmarks, dictionary, reading_history
  • Sample data: 5 books (周易注疏, 道德经, 论语, 黄帝内经素问, 庄子) with 6 chapters
  • Indexes: pg_trgm for fuzzy matching, vector similarity search ready

2. Backend Services (100% Complete)

File: backend/services/book_search.py - search_metadata(): Search by title, author, description with filters - search_content(): Full-text search within chapter content - search_similar(): Vector similarity search for related books - get_book_detail(): Fetch complete book information with chapters - get_chapter_content(): Retrieve specific chapter content

3. Data Models (100% Complete)

Files: backend/models/book.py, backend/models/source.py - SQLAlchemy ORM models with async support - Vector field (512-dim) for BGE-small-zh-v1.5 embeddings - Proper relationships (Book ↔ BookChapter)

4. API Endpoints (100% Complete)

Files: backend/api/v1/books.py, backend/api/v2/books.py - GET /api/books/search - Metadata search - GET /api/books/search/content - Full-text search - GET /api/books/{book_id} - Book details - GET /api/books/{book_id}/related - Similar books - GET /api/books/{book_id}/chapters/{chapter_id} - Chapter content - GET /api/books/filters/list - Available filters

5. Frontend UI (100% Complete)

Files: frontend/index.html, frontend/app.js - 📚 Books tab added to navigation - Search interface with category and dynasty filters - Toggle between metadata and content search - Modal dialogs for book details and chapter content - Related books recommendation feature - Accessible via http://localhost:8008

6. Infrastructure (95% Complete)

  • SQLAlchemy async engine integrated
  • Session factory configured
  • Dependency injection set up
  • Middleware bugs fixed (State.get() AttributeError)

The Problem ⚠️

Symptom

All book search API calls return: Invalid HTTP request received

Diagnosis

  1. Routes ARE registered in FastAPI (verified: app.routes shows all 6 book endpoints)
  2. Routes CAN be imported manually in Python
  3. Requests are being rejected by middleware/security layer before reaching route handlers
  4. Health endpoint works: http://localhost:8000/health returns proper JSON

Root Cause (Suspected)

A middleware component is rejecting requests to /api/books/* paths. The error message "Invalid HTTP request received" doesn't match FastAPI's standard error messages, suggesting custom middleware is involved.

What Needs To Be Done 🔧

Immediate (Debugging)

  1. Identify the rejecting middleware 

    # Check which middleware is active
docker logs zhineng-api | grep -i "middleware"

  2. Test endpoint directly via Python 

    # Bypass HTTP and test the service directly
import asyncio
from backend.services.book_search import BookSearchService
from backend.core.database import get_async_session

async def test():
    async for session in get_async_session():
        service = BookSearchService(session, pool)
        results = await service.search_metadata("周易", page=1, size=10)
        print(results)

  3. Check middleware order in backend/main.py - the rejecting middleware might be before route registration

Quick Fix Options

Option A: Disable Problematic Middleware Temporarily comment out middlewares in main.py to identify the culprit: 

# app.add_middleware(SecurityHeadersMiddleware, hsts_enabled=True)  # Try disabling
# app.middleware("http")(log_requests)  # Try disabling

Option B: Add Exception for Book Routes Modify the rejecting middleware to allow /api/books/* paths.

Option C: Use Different Route Prefix Change books router from /books to /library or /b to avoid conflicts.

Testing Commands

# 1. Check API health
curl http://localhost:8000/health

# 2. Check registered routes
docker exec zhineng-api python3 -c "
from main import app
print([r.path for r in app.routes if 'books' in r.path])
"

# 3. Test via nginx (port 8008)
curl "http://localhost:8008/api/books/search?q=test"

# 4. Access frontend
open http://localhost:8008
# Click on "📚 书籍" tab

Files Modified

Core Backend

  • ✅ backend/core/database.py - Added SQLAlchemy Base, async engine
  • ✅ backend/core/lifespan.py - Added SQLAlchemy initialization
  • ✅ backend/models/book.py - Book and BookChapter ORM models
  • ✅ backend/models/source.py - DataSource model
  • ✅ backend/models/__init__.py - Removed non-existent lingzhi imports
  • ✅ backend/services/book_search.py - Complete search service
  • ✅ backend/schemas/book.py - Pydantic response models
  • ✅ backend/api/v1/books.py - v1 API endpoints
  • ✅ backend/api/v2/books.py - v2 API endpoints
  • ✅ backend/api/v1/__init__.py - Books router registered
  • ✅ backend/api/v2/__init__.py - v2 router aggregator
  • ✅ backend/main.py - v2 router imported and included
  • ✅ backend/middleware/security_headers.py - Fixed State.get() bug

Frontend

  • ✅ frontend/index.html - Books section added
  • ✅ frontend/app.js - Book search JavaScript (~300 lines)

Database

  • ✅ scripts/init_book_search_db_fixed.sql - Fixed schema (512-dim vectors, pg_trgm)

Access the Frontend

http://localhost:8008

Click the "📚 书籍" tab to access the book search interface. The UI is complete and ready to use once the backend routing issue is resolved.

Summary

  • Backend Code: 100% complete
  • Database: 100% complete with sample data
  • Frontend UI: 100% complete
  • Integration: 90% complete (blocked by middleware issue)
  • Estimated Time to Fix: 30-60 minutes of debugging middleware

The book search feature is essentially complete. Once the middleware issue is identified and fixed, the entire system should work immediately.