321 lines
13 KiB
Python
321 lines
13 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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海报服务层 - 重构版本
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封装核心功能，支持基于模板的动态内容生成和海报创建
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"""
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import logging
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import uuid
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import time
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import json
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import importlib
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import base64
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from io import BytesIO
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from typing import List, Dict, Any, Optional, Type, Union, cast
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from datetime import datetime
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from pathlib import Path
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from PIL import Image
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from core.config import ConfigManager, PosterConfig
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from core.ai import AIAgent
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from utils.file_io import OutputManager
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from utils.image_processor import ImageProcessor
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from poster.templates.base_template import BaseTemplate
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from api.services.database_service import DatabaseService
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logger = logging.getLogger(__name__)
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class PosterService:
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"""海报服务类"""
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def __init__(self, ai_agent: AIAgent, config_manager: ConfigManager, output_manager: OutputManager):
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"""初始化海报服务"""
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self.ai_agent = ai_agent
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self.config_manager = config_manager
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self.output_manager = output_manager
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self.db_service = DatabaseService(config_manager)
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self._templates = {}
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self._template_instances = {}
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self._image_usage_tracker = {}
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self._init_templates()
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def _init_templates(self):
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"""从数据库加载模板配置"""
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try:
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db_templates = self.db_service.get_active_poster_templates()
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if db_templates:
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self._templates = {t['id']: t for t in db_templates}
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logger.info(f"从数据库加载了 {len(self._templates)} 个模板")
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else:
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self._load_default_templates()
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logger.info("数据库无模板，使用默认模板配置")
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except Exception as e:
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logger.error(f"从数据库加载模板失败: {e}", exc_info=True)
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self._load_default_templates()
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def _load_default_templates(self):
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"""加载默认模板配置"""
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self._templates = {
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'vibrant': {
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'id': 'vibrant',
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'name': '活力风格',
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'handler_path': 'poster.templates.vibrant_template',
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'class_name': 'VibrantTemplate',
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'description': '适合景点、活动等充满活力的场景',
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'is_active': True
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},
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'business': {
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'id': 'business',
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'name': '商务风格',
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'handler_path': 'poster.templates.business_template',
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'class_name': 'BusinessTemplate',
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'description': '适合酒店、房地产等商务场景',
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'is_active': True
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}
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}
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def _load_template_handler(self, template_id: str) -> Optional[BaseTemplate]:
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"""动态加载模板处理器"""
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if template_id not in self._templates:
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logger.error(f"未找到模板: {template_id}")
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return None
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# 如果已经实例化过，直接返回缓存的实例
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if template_id in self._template_instances:
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return self._template_instances[template_id]
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template_info = self._templates[template_id]
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handler_path = template_info.get('handler_path')
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class_name = template_info.get('class_name')
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if not handler_path or not class_name:
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logger.error(f"模板 {template_id} 缺少 handler_path 或 class_name")
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return None
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try:
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# 动态导入模块和类
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module = importlib.import_module(handler_path)
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template_class = getattr(module, class_name)
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# 实例化模板
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template_instance = template_class()
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# 设置字体目录（如果配置了）
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from core.config import PosterConfig
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poster_config = self.config_manager.get_config('poster', PosterConfig)
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if poster_config:
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font_dir = poster_config.font_dir
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if font_dir and hasattr(template_instance, 'set_font_dir'):
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template_instance.set_font_dir(font_dir)
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# 缓存实例以便重用
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self._template_instances[template_id] = template_instance
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logger.info(f"成功加载模板处理器: {template_id} ({handler_path}.{class_name})")
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return template_instance
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except (ImportError, AttributeError) as e:
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logger.error(f"加载模板处理器失败: {e}", exc_info=True)
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return None
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def reload_templates(self):
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"""重新加载模板信息"""
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logger.info("重新加载模板信息...")
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self._init_templates()
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# 清除缓存的模板实例，以便重新加载
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self._template_instances = {}
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def get_available_templates(self) -> List[Dict[str, Any]]:
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"""获取所有可用的模板信息"""
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result = []
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for tid in self._templates:
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if self._templates[tid].get('is_active'):
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template_info = self.get_template_info(tid)
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if template_info:
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result.append(template_info)
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return result
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def get_template_info(self, template_id: str) -> Optional[Dict[str, Any]]:
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"""获取指定模板的简化信息"""
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template = self._templates.get(template_id)
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if not template:
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return None
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return {
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"id": template["id"],
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"name": template["name"],
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"description": template["description"],
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"has_prompts": bool(template.get("system_prompt") and template.get("user_prompt_template")),
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"input_format": template.get("input_format", {}),
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"output_format": template.get("output_format", {}),
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"is_active": template.get("is_active", False)
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}
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async def generate_poster(self,
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template_id: str,
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poster_content: Optional[Dict[str, Any]],
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content_id: Optional[int],
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product_id: Optional[int],
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scenic_spot_id: Optional[int],
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image_ids: Optional[List[int]],
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num_variations: int = 1,
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force_llm_generation: bool = False) -> Dict[str, Any]:
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"""
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统一的海报生成入口
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Args:
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template_id: 模板ID
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poster_content: 用户提供的海报内容（可选）
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content_id: 内容ID，用于从数据库获取内容（可选）
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product_id: 产品ID，用于从数据库获取产品信息（可选）
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scenic_spot_id: 景点ID，用于从数据库获取景点信息（可选）
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image_ids: 图片ID列表，用于从数据库获取图片（可选）
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num_variations: 需要生成的变体数量
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force_llm_generation: 是否强制使用LLM生成内容
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Returns:
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生成结果字典
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"""
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start_time = time.time()
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# 1. 动态加载模板处理器
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template_handler = self._load_template_handler(template_id)
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if not template_handler:
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raise ValueError(f"无法为模板ID '{template_id}' 加载处理器。")
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# 2. 准备内容 (LLM或用户提供)
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final_content = poster_content
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if force_llm_generation or not final_content:
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logger.info(f"为模板 {template_id} 按需生成内容...")
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final_content = await self._generate_content_with_llm(template_id, content_id, product_id, scenic_spot_id)
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if not final_content:
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raise ValueError("无法获取用于生成海报的内容")
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# 3. 准备图片
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images = []
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if image_ids:
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images = self.db_service.get_images_by_ids(image_ids)
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if not images:
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raise ValueError("无法获取指定的图片")
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# 4. 调用模板生成海报
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try:
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posters = template_handler.generate(
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content=final_content,
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images=images,
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num_variations=num_variations
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)
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if not posters:
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raise ValueError("模板未能生成有效的海报")
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# 5. 保存海报并返回结果
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variations = []
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for i, poster in enumerate(posters):
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output_path = self._save_poster(poster, template_id, i)
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if output_path:
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variations.append({
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"variation_id": i,
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"poster_path": str(output_path),
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"base64": self._image_to_base64(poster)
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})
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# 记录模板使用情况
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self._update_template_stats(template_id, bool(variations), time.time() - start_time)
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return {
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"request_id": f"poster-{datetime.now().strftime('%Y%m%d-%H%M%S')}-{str(uuid.uuid4())[:8]}",
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"template_id": template_id,
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"variations": variations,
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"metadata": {
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"generation_time": f"{time.time() - start_time:.2f}s",
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"model_used": self.ai_agent.config.model if force_llm_generation or not poster_content else None,
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"num_variations": len(variations)
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}
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}
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except Exception as e:
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logger.error(f"生成海报时发生错误: {e}", exc_info=True)
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self._update_template_stats(template_id, False, time.time() - start_time)
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raise ValueError(f"生成海报失败: {str(e)}")
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def _save_poster(self, poster: Image.Image, template_id: str, variation_id: int) -> Optional[Path]:
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"""保存海报到文件系统"""
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try:
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# 创建唯一的主题ID用于保存
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topic_id = f"poster_{template_id}_{datetime.now().strftime('%Y%m%d_%H%M%S')}"
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# 获取输出目录
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output_dir = self.output_manager.get_topic_dir(topic_id)
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# 生成文件名
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file_name = f"{template_id}_v{variation_id}.png"
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file_path = output_dir / file_name
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# 保存图像
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poster.save(file_path, format="PNG")
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logger.info(f"海报已保存: {file_path}")
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return file_path
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except Exception as e:
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logger.error(f"保存海报失败: {e}", exc_info=True)
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return None
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def _image_to_base64(self, image: Image.Image) -> str:
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"""将PIL图像转换为base64字符串"""
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buffer = BytesIO()
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image.save(buffer, format="PNG")
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return base64.b64encode(buffer.getvalue()).decode('utf-8')
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def _update_template_stats(self, template_id: str, success: bool, duration: float):
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"""更新模板使用统计"""
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try:
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# 调用数据库服务的方法更新统计
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self.db_service.update_template_usage_stats(
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template_id=template_id,
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success=success,
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processing_time=duration
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)
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except Exception as e:
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logger.warning(f"更新模板统计失败: {e}")
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async def _generate_content_with_llm(self, template_id: str, content_id: Optional[int],
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product_id: Optional[int], scenic_spot_id: Optional[int]) -> Optional[Dict[str, Any]]:
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"""使用LLM生成海报内容"""
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# 获取提示词
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template_info = self._templates.get(template_id, {})
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system_prompt = template_info.get('system_prompt', "")
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user_prompt_template = template_info.get('user_prompt_template', "")
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if not system_prompt or not user_prompt_template:
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logger.error(f"模板 {template_id} 缺少提示词配置")
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return None
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# 获取相关数据
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data = {}
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if content_id:
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data['content'] = self.db_service.get_content_by_id(content_id)
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if product_id:
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data['product'] = self.db_service.get_product_by_id(product_id)
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if scenic_spot_id:
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data['scenic_spot'] = self.db_service.get_scenic_spot_by_id(scenic_spot_id)
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# 格式化提示词
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try:
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user_prompt = user_prompt_template.format(**data)
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except KeyError as e:
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logger.warning(f"格式化提示词时缺少键: {e}")
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user_prompt = user_prompt_template + f"\n可用数据: {json.dumps(data, ensure_ascii=False)}"
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try:
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response, _, _, _ = await self.ai_agent.generate_text(system_prompt=system_prompt, user_prompt=user_prompt)
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json_start = response.find('{')
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json_end = response.rfind('}') + 1
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if json_start != -1 and json_end != -1:
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return json.loads(response[json_start:json_end])
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logger.error(f"LLM响应中未找到JSON: {response}")
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return None
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except Exception as e:
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logger.error(f"生成内容时发生错误: {e}", exc_info=True)
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return None |