K2cr2O1
5f943c1792
- 新增github_parser插件，支持通过命令或自动解析链接查询GitHub仓库信息 - 添加github_repo.html模板用于渲染仓库信息图片 - 优化图片管理器支持高质量截图和CSS缩放 - 重构消息事件类权限常量定义方式 - 更新帮助页面样式为三列布局并优化响应式设计
130 lines
5.0 KiB
Python
130 lines
5.0 KiB
Python
"""
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图片生成管理器模块
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负责管理图片生成相关的逻辑，支持多种渲染引擎（目前支持 Playwright）。
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"""
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import os
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import base64
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from typing import Dict, Any, Optional
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from jinja2 import Template
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from .browser_manager import browser_manager
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from ..utils.logger import logger
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class ImageManager:
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"""
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图片生成管理器（单例）
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"""
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_instance = None
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def __new__(cls):
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if cls._instance is None:
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cls._instance = super().__new__(cls)
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return cls._instance
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def __init__(self):
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# 模板目录
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self.template_dir = os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(__file__))), "templates")
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# 临时文件目录
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# core/managers/image_manager.py -> core/managers -> core -> core/data/temp
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self.temp_dir = os.path.join(os.path.dirname(os.path.dirname(__file__)), "data", "temp")
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os.makedirs(self.temp_dir, exist_ok=True)
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# 模板缓存
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self._template_cache: Dict[str, Template] = {}
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async def render_template(self, template_name: str, data: Dict[str, Any], output_name: str = "output.png", quality: int = 80, image_type: str = "png") -> Optional[str]:
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"""
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使用 Playwright 渲染 Jinja2 模板并保存为图片文件
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Args:
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template_name (str): 模板文件名 (例如 "help.html")
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data (Dict[str, Any]): 传递给模板的数据字典
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output_name (str, optional): 输出文件名. Defaults to "output.png".
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quality (int, optional): JPEG 质量 (0-100). 仅在 image_type 为 jpeg 时有效. Defaults to 80.
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image_type (str, optional): 图片类型 ('png' or 'jpeg'). Defaults to "png".
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Returns:
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Optional[str]: 生成图片的绝对路径，如果失败则返回 None
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"""
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template_path = os.path.join(self.template_dir, template_name)
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if not os.path.exists(template_path):
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logger.error(f"模板文件未找到: {template_path}")
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return None
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try:
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# 1. 渲染 HTML (使用缓存)
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if template_name in self._template_cache:
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template = self._template_cache[template_name]
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else:
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with open(template_path, "r", encoding="utf-8") as f:
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template_str = f.read()
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template = Template(template_str)
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self._template_cache[template_name] = template
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html_content = template.render(**data)
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# 2. 使用浏览器截图
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# 改为从池中获取页面
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page = await browser_manager.get_page()
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if not page:
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logger.error("无法获取浏览器页面")
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return None
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try:
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width = 1920
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height = 1080
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await page.set_viewport_size({"width": width, "height": height})
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# 加载内容
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await page.set_content(html_content)
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await page.wait_for_selector("body")
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screenshot_args = {
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'full_page': True,
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'type': image_type,
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'omit_background': False,
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'scale': 'css'
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}
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if image_type == 'jpeg':
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screenshot_args['quality'] = quality
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screenshot_bytes = await page.screenshot(**screenshot_args) # type: ignore
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finally:
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# 归还页面到池中，而不是直接关闭
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await browser_manager.release_page(page)
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# 3. 保存文件
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output_path = os.path.join(self.temp_dir, output_name)
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with open(output_path, "wb") as f:
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f.write(screenshot_bytes)
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logger.info(f"图片已生成: {output_path} ({len(screenshot_bytes)/1024:.2f} KB)")
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return os.path.abspath(output_path)
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except Exception as e:
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logger.exception(f"渲染模板 {template_name} 失败: {e}")
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return None
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async def render_template_to_base64(self, template_name: str, data: Dict[str, Any], output_name: str = "output.png", quality: int = 80, image_type: str = "png") -> Optional[str]:
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"""
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渲染模板并返回 Base64 编码的图片字符串
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"""
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file_path = await self.render_template(template_name, data, output_name, quality, image_type)
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if not file_path:
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return None
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try:
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with open(file_path, "rb") as f:
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content = f.read()
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mime_type = "image/jpeg" if image_type == "jpeg" else "image/png"
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return f"data:{mime_type};base64," + base64.b64encode(content).decode("utf-8")
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except Exception as e:
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logger.error(f"读取图片文件失败: {e}")
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return None
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# 全局图片管理器实例
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image_manager = ImageManager()
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