xiamuceer
659 lines
26 KiB
Python
659 lines
26 KiB
Python
"""章节管理API"""
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from fastapi import APIRouter, Depends, HTTPException, Request
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from fastapi.responses import StreamingResponse
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy import select, func
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import json
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import asyncio
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from app.database import get_db
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from app.models.chapter import Chapter
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from app.models.project import Project
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from app.models.outline import Outline
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from app.models.character import Character
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from app.models.generation_history import GenerationHistory
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from app.schemas.chapter import (
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ChapterCreate,
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ChapterUpdate,
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ChapterResponse,
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ChapterListResponse
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)
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from app.services.ai_service import AIService
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from app.services.prompt_service import prompt_service
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from app.logger import get_logger
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from app.api.settings import get_user_ai_service
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router = APIRouter(prefix="/chapters", tags=["章节管理"])
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logger = get_logger(__name__)
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@router.post("", response_model=ChapterResponse, summary="创建章节")
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async def create_chapter(
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chapter: ChapterCreate,
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db: AsyncSession = Depends(get_db)
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):
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"""创建新的章节"""
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# 验证项目是否存在
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result = await db.execute(
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select(Project).where(Project.id == chapter.project_id)
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)
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project = result.scalar_one_or_none()
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if not project:
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raise HTTPException(status_code=404, detail="项目不存在")
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# 计算字数
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word_count = len(chapter.content)
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db_chapter = Chapter(
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**chapter.model_dump(),
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word_count=word_count
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)
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db.add(db_chapter)
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# 更新项目的当前字数
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project.current_words = project.current_words + word_count
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await db.commit()
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await db.refresh(db_chapter)
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return db_chapter
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@router.get("/project/{project_id}", response_model=ChapterListResponse, summary="获取项目的所有章节")
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async def get_project_chapters(
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project_id: str,
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db: AsyncSession = Depends(get_db)
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):
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"""获取指定项目的所有章节（路径参数版本）"""
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# 获取总数
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count_result = await db.execute(
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select(func.count(Chapter.id)).where(Chapter.project_id == project_id)
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)
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total = count_result.scalar_one()
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# 获取章节列表
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result = await db.execute(
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select(Chapter)
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.where(Chapter.project_id == project_id)
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.order_by(Chapter.chapter_number)
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)
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chapters = result.scalars().all()
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return ChapterListResponse(total=total, items=chapters)
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@router.get("/{chapter_id}", response_model=ChapterResponse, summary="获取章节详情")
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async def get_chapter(
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chapter_id: str,
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db: AsyncSession = Depends(get_db)
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):
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"""根据ID获取章节详情"""
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result = await db.execute(
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select(Chapter).where(Chapter.id == chapter_id)
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)
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chapter = result.scalar_one_or_none()
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if not chapter:
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raise HTTPException(status_code=404, detail="章节不存在")
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return chapter
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@router.put("/{chapter_id}", response_model=ChapterResponse, summary="更新章节")
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async def update_chapter(
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chapter_id: str,
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chapter_update: ChapterUpdate,
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db: AsyncSession = Depends(get_db)
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):
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"""更新章节信息"""
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result = await db.execute(
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select(Chapter).where(Chapter.id == chapter_id)
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)
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chapter = result.scalar_one_or_none()
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if not chapter:
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raise HTTPException(status_code=404, detail="章节不存在")
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# 记录旧字数
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old_word_count = chapter.word_count or 0
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# 更新字段
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update_data = chapter_update.model_dump(exclude_unset=True)
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for field, value in update_data.items():
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setattr(chapter, field, value)
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# 如果内容更新了，重新计算字数
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if "content" in update_data and chapter.content:
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new_word_count = len(chapter.content)
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chapter.word_count = new_word_count
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# 更新项目字数
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result = await db.execute(
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select(Project).where(Project.id == chapter.project_id)
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)
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project = result.scalar_one_or_none()
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if project:
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project.current_words = project.current_words - old_word_count + new_word_count
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await db.commit()
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await db.refresh(chapter)
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return chapter
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@router.delete("/{chapter_id}", summary="删除章节")
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async def delete_chapter(
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chapter_id: str,
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db: AsyncSession = Depends(get_db)
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):
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"""删除章节"""
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result = await db.execute(
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select(Chapter).where(Chapter.id == chapter_id)
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)
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chapter = result.scalar_one_or_none()
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if not chapter:
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raise HTTPException(status_code=404, detail="章节不存在")
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# 更新项目字数
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result = await db.execute(
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select(Project).where(Project.id == chapter.project_id)
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)
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project = result.scalar_one_or_none()
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if project:
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project.current_words = max(0, project.current_words - chapter.word_count)
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await db.delete(chapter)
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await db.commit()
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return {"message": "章节删除成功"}
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async def check_prerequisites(db: AsyncSession, chapter: Chapter) -> tuple[bool, str, list[Chapter]]:
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"""
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检查章节前置条件
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Args:
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db: 数据库会话
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chapter: 当前章节
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Returns:
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(可否生成, 错误信息, 前置章节列表)
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"""
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# 如果是第一章，无需检查前置
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if chapter.chapter_number == 1:
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return True, "", []
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# 查询所有前置章节（序号小于当前章节的）
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result = await db.execute(
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select(Chapter)
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.where(Chapter.project_id == chapter.project_id)
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.where(Chapter.chapter_number < chapter.chapter_number)
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.order_by(Chapter.chapter_number)
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)
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previous_chapters = result.scalars().all()
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# 检查是否所有前置章节都有内容
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incomplete_chapters = [
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ch for ch in previous_chapters
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if not ch.content or ch.content.strip() == ""
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]
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if incomplete_chapters:
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missing_numbers = [str(ch.chapter_number) for ch in incomplete_chapters]
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error_msg = f"需要先完成前置章节：第 {', '.join(missing_numbers)} 章"
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return False, error_msg, previous_chapters
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return True, "", previous_chapters
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@router.get("/{chapter_id}/can-generate", summary="检查章节是否可以生成")
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async def check_can_generate(
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chapter_id: str,
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db: AsyncSession = Depends(get_db)
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):
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"""
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检查章节是否满足生成条件
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返回可生成状态和前置章节信息
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"""
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# 获取章节
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result = await db.execute(
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select(Chapter).where(Chapter.id == chapter_id)
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)
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chapter = result.scalar_one_or_none()
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if not chapter:
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raise HTTPException(status_code=404, detail="章节不存在")
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# 检查前置条件
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can_generate, error_msg, previous_chapters = await check_prerequisites(db, chapter)
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# 构建前置章节信息
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previous_info = [
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{
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"id": ch.id,
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"chapter_number": ch.chapter_number,
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"title": ch.title,
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"has_content": bool(ch.content and ch.content.strip()),
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"word_count": ch.word_count or 0
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}
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for ch in previous_chapters
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]
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return {
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"can_generate": can_generate,
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"reason": error_msg if not can_generate else "",
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"previous_chapters": previous_info,
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"chapter_number": chapter.chapter_number
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}
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@router.post("/{chapter_id}/generate", summary="AI创作章节内容")
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async def generate_chapter_content(
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chapter_id: str,
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db: AsyncSession = Depends(get_db),
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user_ai_service: AIService = Depends(get_user_ai_service)
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):
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"""
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根据大纲、前置章节内容和项目信息AI创作章节完整内容
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要求：必须按顺序生成，确保前置章节都已完成
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"""
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# 获取章节
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result = await db.execute(
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select(Chapter).where(Chapter.id == chapter_id)
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)
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chapter = result.scalar_one_or_none()
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if not chapter:
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raise HTTPException(status_code=404, detail="章节不存在")
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# 检查前置条件
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can_generate, error_msg, previous_chapters = await check_prerequisites(db, chapter)
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if not can_generate:
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raise HTTPException(status_code=400, detail=error_msg)
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try:
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# 获取项目信息
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project_result = await db.execute(
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select(Project).where(Project.id == chapter.project_id)
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)
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project = project_result.scalar_one_or_none()
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if not project:
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raise HTTPException(status_code=404, detail="项目不存在")
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# 获取对应的大纲（使用新的查询确保获取最新数据）
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outline_result = await db.execute(
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select(Outline)
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.where(Outline.project_id == chapter.project_id)
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.where(Outline.order_index == chapter.chapter_number)
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.execution_options(populate_existing=True)
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)
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outline = outline_result.scalar_one_or_none()
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# 获取所有大纲用于上下文（使用新的查询确保获取最新数据）
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all_outlines_result = await db.execute(
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select(Outline)
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.where(Outline.project_id == chapter.project_id)
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.order_by(Outline.order_index)
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.execution_options(populate_existing=True)
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)
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all_outlines = all_outlines_result.scalars().all()
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outlines_context = "\n".join([
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f"第{o.order_index}章 {o.title}: {o.content[:100]}..."
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for o in all_outlines
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])
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# 获取角色信息
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characters_result = await db.execute(
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select(Character).where(Character.project_id == chapter.project_id)
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)
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characters = characters_result.scalars().all()
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characters_info = "\n".join([
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f"- {c.name}({'组织' if c.is_organization else '角色'}, {c.role_type}): {c.personality[:100] if c.personality else ''}"
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for c in characters
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])
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# 构建前置章节内容上下文（如果有前置章节）
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previous_content = ""
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if previous_chapters:
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# Token控制：保留最近3章的完整内容，早期章节使用摘要
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recent_chapters = previous_chapters[-3:] if len(previous_chapters) > 3 else previous_chapters
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early_chapters = previous_chapters[:-3] if len(previous_chapters) > 3 else []
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# 早期章节摘要
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if early_chapters:
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early_summary = "【前期剧情概要】\n" + "\n".join([
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f"第{ch.chapter_number}章《{ch.title}》：{ch.content[:200] if ch.content else ''}..."
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for ch in early_chapters
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])
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previous_content += early_summary + "\n\n"
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# 最近章节完整内容
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if recent_chapters:
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recent_content = "【最近章节完整内容】\n" + "\n\n".join([
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f"=== 第{ch.chapter_number}章：{ch.title} ===\n{ch.content}"
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for ch in recent_chapters
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])
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previous_content += recent_content
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logger.info(f"构建前置上下文：{len(early_chapters)}章摘要 + {len(recent_chapters)}章完整内容")
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# 根据是否有前置内容选择不同的提示词
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if previous_content:
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# 使用带上下文的提示词
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prompt = prompt_service.get_chapter_generation_with_context_prompt(
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title=project.title,
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theme=project.theme or '',
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genre=project.genre or '',
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narrative_perspective=project.narrative_perspective or '第三人称',
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time_period=project.world_time_period or '未设定',
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location=project.world_location or '未设定',
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atmosphere=project.world_atmosphere or '未设定',
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rules=project.world_rules or '未设定',
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characters_info=characters_info or '暂无角色信息',
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outlines_context=outlines_context,
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previous_content=previous_content,
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chapter_number=chapter.chapter_number,
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chapter_title=chapter.title,
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chapter_outline=outline.content if outline else chapter.summary or '暂无大纲'
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)
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else:
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# 第一章，使用原有提示词
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prompt = prompt_service.get_chapter_generation_prompt(
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title=project.title,
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theme=project.theme or '',
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genre=project.genre or '',
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narrative_perspective=project.narrative_perspective or '第三人称',
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time_period=project.world_time_period or '未设定',
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location=project.world_location or '未设定',
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atmosphere=project.world_atmosphere or '未设定',
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rules=project.world_rules or '未设定',
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characters_info=characters_info or '暂无角色信息',
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outlines_context=outlines_context,
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chapter_number=chapter.chapter_number,
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chapter_title=chapter.title,
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chapter_outline=outline.content if outline else chapter.summary or '暂无大纲'
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)
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logger.info(f"开始AI创作章节 {chapter_id}")
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# 调用AI生成
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ai_content = await user_ai_service.generate_text(
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prompt=prompt
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)
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# 更新章节内容
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old_word_count = chapter.word_count or 0
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chapter.content = ai_content
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new_word_count = len(ai_content)
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chapter.word_count = new_word_count
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chapter.status = "completed"
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# 更新项目字数
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project.current_words = project.current_words - old_word_count + new_word_count
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# 记录生成历史
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history = GenerationHistory(
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project_id=chapter.project_id,
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chapter_id=chapter.id,
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prompt=f"创作章节: 第{chapter.chapter_number}章 {chapter.title}",
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generated_content=ai_content[:500] if len(ai_content) > 500 else ai_content,
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model="default"
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)
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db.add(history)
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await db.commit()
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await db.refresh(chapter)
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logger.info(f"成功创作章节 {chapter_id}，共 {new_word_count} 字")
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return {"content": ai_content}
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except Exception as e:
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logger.error(f"创作章节失败: {str(e)}")
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raise HTTPException(status_code=500, detail=f"创作章节失败: {str(e)}")
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@router.post("/{chapter_id}/generate-stream", summary="AI创作章节内容（流式）")
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async def generate_chapter_content_stream(
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chapter_id: str,
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request: Request,
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user_ai_service: AIService = Depends(get_user_ai_service)
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):
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"""
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根据大纲、前置章节内容和项目信息AI创作章节完整内容（流式返回）
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要求：必须按顺序生成，确保前置章节都已完成
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注意：此函数不使用依赖注入的db，而是在生成器内部创建独立的数据库会话
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以避免流式响应期间的连接泄漏问题
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"""
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# 预先验证章节存在性（使用临时会话）
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async for temp_db in get_db(request):
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try:
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result = await temp_db.execute(
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select(Chapter).where(Chapter.id == chapter_id)
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)
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chapter = result.scalar_one_or_none()
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if not chapter:
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raise HTTPException(status_code=404, detail="章节不存在")
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# 检查前置条件
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can_generate, error_msg, previous_chapters = await check_prerequisites(temp_db, chapter)
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if not can_generate:
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raise HTTPException(status_code=400, detail=error_msg)
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# 保存前置章节数据供生成器使用
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previous_chapters_data = [
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{
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'id': ch.id,
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'chapter_number': ch.chapter_number,
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'title': ch.title,
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'content': ch.content
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}
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for ch in previous_chapters
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]
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finally:
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await temp_db.close()
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break
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async def event_generator():
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# 在生成器内部创建独立的数据库会话
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db_session = None
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db_committed = False
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try:
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# 创建新的数据库会话
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async for db_session in get_db(request):
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# 重新获取章节信息
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chapter_result = await db_session.execute(
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select(Chapter).where(Chapter.id == chapter_id)
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)
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current_chapter = chapter_result.scalar_one_or_none()
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if not current_chapter:
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yield f"data: {json.dumps({'type': 'error', 'error': '章节不存在'}, ensure_ascii=False)}\n\n"
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return
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# 获取项目信息
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project_result = await db_session.execute(
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select(Project).where(Project.id == current_chapter.project_id)
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)
|
||
project = project_result.scalar_one_or_none()
|
||
if not project:
|
||
yield f"data: {json.dumps({'type': 'error', 'error': '项目不存在'}, ensure_ascii=False)}\n\n"
|
||
return
|
||
|
||
# 获取对应的大纲
|
||
outline_result = await db_session.execute(
|
||
select(Outline)
|
||
.where(Outline.project_id == current_chapter.project_id)
|
||
.where(Outline.order_index == current_chapter.chapter_number)
|
||
.execution_options(populate_existing=True)
|
||
)
|
||
outline = outline_result.scalar_one_or_none()
|
||
|
||
# 获取所有大纲用于上下文
|
||
all_outlines_result = await db_session.execute(
|
||
select(Outline)
|
||
.where(Outline.project_id == current_chapter.project_id)
|
||
.order_by(Outline.order_index)
|
||
.execution_options(populate_existing=True)
|
||
)
|
||
all_outlines = all_outlines_result.scalars().all()
|
||
outlines_context = "\n".join([
|
||
f"第{o.order_index}章 {o.title}: {o.content[:100]}..."
|
||
for o in all_outlines
|
||
])
|
||
|
||
# 获取角色信息
|
||
characters_result = await db_session.execute(
|
||
select(Character).where(Character.project_id == current_chapter.project_id)
|
||
)
|
||
characters = characters_result.scalars().all()
|
||
characters_info = "\n".join([
|
||
f"- {c.name}({'组织' if c.is_organization else '角色'}, {c.role_type}): {c.personality[:100] if c.personality else ''}"
|
||
for c in characters
|
||
])
|
||
|
||
# 构建前置章节内容上下文（使用之前保存的数据）
|
||
previous_content = ""
|
||
if previous_chapters_data:
|
||
recent_chapters = previous_chapters_data[-3:] if len(previous_chapters_data) > 3 else previous_chapters_data
|
||
early_chapters = previous_chapters_data[:-3] if len(previous_chapters_data) > 3 else []
|
||
|
||
if early_chapters:
|
||
early_summary = "【前期剧情概要】\n" + "\n".join([
|
||
f"第{ch['chapter_number']}章《{ch['title']}》：{ch['content'][:200] if ch['content'] else ''}..."
|
||
for ch in early_chapters
|
||
])
|
||
previous_content += early_summary + "\n\n"
|
||
|
||
if recent_chapters:
|
||
recent_content = "【最近章节完整内容】\n" + "\n\n".join([
|
||
f"=== 第{ch['chapter_number']}章：{ch['title']} ===\n{ch['content']}"
|
||
for ch in recent_chapters
|
||
])
|
||
previous_content += recent_content
|
||
|
||
logger.info(f"构建前置上下文：{len(early_chapters)}章摘要 + {len(recent_chapters)}章完整内容")
|
||
|
||
# 发送开始事件
|
||
yield f"data: {json.dumps({'type': 'start', 'message': '开始AI创作...'}, ensure_ascii=False)}\n\n"
|
||
|
||
# 根据是否有前置内容选择不同的提示词
|
||
if previous_content:
|
||
prompt = prompt_service.get_chapter_generation_with_context_prompt(
|
||
title=project.title,
|
||
theme=project.theme or '',
|
||
genre=project.genre or '',
|
||
narrative_perspective=project.narrative_perspective or '第三人称',
|
||
time_period=project.world_time_period or '未设定',
|
||
location=project.world_location or '未设定',
|
||
atmosphere=project.world_atmosphere or '未设定',
|
||
rules=project.world_rules or '未设定',
|
||
characters_info=characters_info or '暂无角色信息',
|
||
outlines_context=outlines_context,
|
||
previous_content=previous_content,
|
||
chapter_number=current_chapter.chapter_number,
|
||
chapter_title=current_chapter.title,
|
||
chapter_outline=outline.content if outline else current_chapter.summary or '暂无大纲'
|
||
)
|
||
else:
|
||
prompt = prompt_service.get_chapter_generation_prompt(
|
||
title=project.title,
|
||
theme=project.theme or '',
|
||
genre=project.genre or '',
|
||
narrative_perspective=project.narrative_perspective or '第三人称',
|
||
time_period=project.world_time_period or '未设定',
|
||
location=project.world_location or '未设定',
|
||
atmosphere=project.world_atmosphere or '未设定',
|
||
rules=project.world_rules or '未设定',
|
||
characters_info=characters_info or '暂无角色信息',
|
||
outlines_context=outlines_context,
|
||
chapter_number=current_chapter.chapter_number,
|
||
chapter_title=current_chapter.title,
|
||
chapter_outline=outline.content if outline else current_chapter.summary or '暂无大纲'
|
||
)
|
||
|
||
logger.info(f"开始AI流式创作章节 {chapter_id}")
|
||
|
||
# 流式生成内容
|
||
full_content = ""
|
||
async for chunk in user_ai_service.generate_text_stream(prompt=prompt):
|
||
full_content += chunk
|
||
yield f"data: {json.dumps({'type': 'content', 'content': chunk}, ensure_ascii=False)}\n\n"
|
||
await asyncio.sleep(0) # 让出控制权
|
||
|
||
# 更新章节内容到数据库
|
||
old_word_count = current_chapter.word_count or 0
|
||
current_chapter.content = full_content
|
||
new_word_count = len(full_content)
|
||
current_chapter.word_count = new_word_count
|
||
current_chapter.status = "completed"
|
||
|
||
# 更新项目字数
|
||
project.current_words = project.current_words - old_word_count + new_word_count
|
||
|
||
# 记录生成历史
|
||
history = GenerationHistory(
|
||
project_id=current_chapter.project_id,
|
||
chapter_id=current_chapter.id,
|
||
prompt=f"创作章节: 第{current_chapter.chapter_number}章 {current_chapter.title}",
|
||
generated_content=full_content[:500] if len(full_content) > 500 else full_content,
|
||
model="default"
|
||
)
|
||
db_session.add(history)
|
||
|
||
await db_session.commit()
|
||
db_committed = True
|
||
await db_session.refresh(current_chapter)
|
||
|
||
logger.info(f"成功创作章节 {chapter_id}，共 {new_word_count} 字")
|
||
|
||
# 发送完成事件
|
||
yield f"data: {json.dumps({'type': 'done', 'message': '创作完成', 'word_count': new_word_count}, ensure_ascii=False)}\n\n"
|
||
|
||
break # 退出async for db_session循环
|
||
|
||
except GeneratorExit:
|
||
# SSE连接断开
|
||
logger.warning("章节生成器被提前关闭（SSE断开）")
|
||
if db_session and not db_committed:
|
||
try:
|
||
if db_session.in_transaction():
|
||
await db_session.rollback()
|
||
logger.info("章节生成事务已回滚（GeneratorExit）")
|
||
except Exception as e:
|
||
logger.error(f"GeneratorExit回滚失败: {str(e)}")
|
||
except Exception as e:
|
||
logger.error(f"流式创作章节失败: {str(e)}")
|
||
if db_session and not db_committed:
|
||
try:
|
||
if db_session.in_transaction():
|
||
await db_session.rollback()
|
||
logger.info("章节生成事务已回滚（异常）")
|
||
except Exception as rollback_error:
|
||
logger.error(f"回滚失败: {str(rollback_error)}")
|
||
yield f"data: {json.dumps({'type': 'error', 'error': str(e)}, ensure_ascii=False)}\n\n"
|
||
finally:
|
||
# 确保数据库会话被正确关闭
|
||
if db_session:
|
||
try:
|
||
# 最后检查：确保没有未提交的事务
|
||
if not db_committed and db_session.in_transaction():
|
||
await db_session.rollback()
|
||
logger.warning("在finally中发现未提交事务，已回滚")
|
||
|
||
await db_session.close()
|
||
logger.info("数据库会话已关闭")
|
||
except Exception as close_error:
|
||
logger.error(f"关闭数据库会话失败: {str(close_error)}")
|
||
# 强制关闭
|
||
try:
|
||
await db_session.close()
|
||
except:
|
||
pass
|
||
|
||
return StreamingResponse(
|
||
event_generator(),
|
||
media_type="text/event-stream",
|
||
headers={
|
||
"Cache-Control": "no-cache",
|
||
"Connection": "keep-alive",
|
||
"X-Accel-Buffering": "no"
|
||
}
|
||
)
|