5a84c60b2c
变更项：\n1. 新增 md2img 专用运行时（独立线程 + 单事件循环），确保浏览器生命周期只在一个 loop 内维护。\n2. 新增运行时任务投递与异步等待封装，支持任意调用方线程/loop 统一提交截图任务。\n3. 调整浏览器预热逻辑：预热改为在 md2img 专用运行时执行，避免预热与业务截图分属不同 loop。\n4. 调整 html_to_image：统一在专用运行时内完成截图，彻底规避跨事件循环复用导致的重建。\n5. 增强中文注释与运行日志，便于定位 runtime loop 与预热状态。
850 lines
32 KiB
Python
850 lines
32 KiB
Python
import subprocess
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import time
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from pathlib import Path
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import shutil
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from typing import Optional, Tuple
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import threading
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from concurrent.futures import Future as ConcurrentFuture
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import psutil
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from playwright.async_api import async_playwright
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import os
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import asyncio
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import re
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from loguru import logger
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try:
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import markdown
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except ImportError:
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markdown = None
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META_KEYWORDS = ["群", "群名", "时间", "日期", "成员", "消息", "统计", "总结", "来源", "生成", "记录"]
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STAT_PILL_CLASSES = {
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"总": "total",
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"人数": "people",
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"文本": "text",
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"图片": "image",
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"视频": "video",
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"链接": "link",
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"表情": "emoji",
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}
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def _extract_stats_pills_from_markdown(md_content: str) -> str:
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text = str(md_content or "")
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pattern = re.compile(
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r"(^##\s+群概览\s*\n)([^\n]+)(?=\n(?:\n|##\s|###\s|$))",
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re.M,
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)
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def replace(match):
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stats_line = match.group(2).strip()
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parts = [part.strip() for part in stats_line.split("·") if part.strip()]
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pills = []
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for part in parts:
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item_match = re.match(r"(?:\*\*)?([^*\s]+)(?:\*\*)?\s+(\d+)", part)
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if not item_match:
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continue
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label = item_match.group(1).strip()
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value = item_match.group(2).strip()
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kind = STAT_PILL_CLASSES.get(label, "default")
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pills.append(
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f'<span class="stats-pill stats-pill-{kind}"><span class="stats-pill-label">{label}</span><span class="stats-pill-value">{value}</span></span>'
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)
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if not pills:
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return match.group(0)
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return match.group(1) + f'<div class="stats-pills">{"".join(pills)}</div>'
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return pattern.sub(replace, text, count=1)
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def _simple_markdown_to_html(md_content: str) -> str:
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lines = str(md_content or "").splitlines()
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html_parts = []
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in_ul = False
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paragraph_lines = []
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def flush_paragraph():
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nonlocal paragraph_lines
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if paragraph_lines:
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text = " ".join(item.strip() for item in paragraph_lines if item.strip())
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if text:
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html_parts.append(f"<p>{text}</p>")
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paragraph_lines = []
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def close_ul():
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nonlocal in_ul
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if in_ul:
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html_parts.append("</ul>")
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in_ul = False
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for raw_line in lines:
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line = raw_line.rstrip()
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stripped = line.strip()
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if not stripped:
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flush_paragraph()
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close_ul()
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continue
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if stripped.startswith("# "):
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flush_paragraph()
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close_ul()
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html_parts.append(f"<h1>{stripped[2:].strip()}</h1>")
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continue
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if stripped.startswith("## "):
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flush_paragraph()
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close_ul()
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html_parts.append(f"<h2>{stripped[3:].strip()}</h2>")
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continue
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if stripped.startswith("### "):
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flush_paragraph()
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close_ul()
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html_parts.append(f"<h3>{stripped[4:].strip()}</h3>")
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continue
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if stripped.startswith("<div ") and stripped.endswith("</div>"):
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flush_paragraph()
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close_ul()
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html_parts.append(stripped)
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continue
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if stripped.startswith("- "):
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flush_paragraph()
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if not in_ul:
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html_parts.append("<ul>")
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in_ul = True
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html_parts.append(f"<li>{stripped[2:].strip()}</li>")
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continue
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close_ul()
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paragraph_lines.append(stripped)
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flush_paragraph()
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close_ul()
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return "\n".join(html_parts)
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async def safe_close_browser(browser, timeout: float = 4.0) -> None:
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if not browser:
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return
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for context in browser.contexts[:]:
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for page in context.pages[:]:
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try:
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await asyncio.wait_for(page.close(), timeout=1.5)
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except Exception:
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pass
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try:
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await asyncio.wait_for(context.close(), timeout=timeout)
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except Exception:
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pass
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try:
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await asyncio.wait_for(browser.close(), timeout=timeout)
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logger.debug("browser closed gracefully")
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return
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except (asyncio.TimeoutError, Exception) as e:
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logger.warning(f"browser.close failed: {e}")
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if browser.process and browser.process.pid:
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try:
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parent = psutil.Process(browser.process.pid)
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children = parent.children(recursive=True)
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for proc in children:
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try:
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proc.terminate()
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except (psutil.NoSuchProcess, psutil.AccessDenied, psutil.ZombieProcess):
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pass
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try:
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parent.terminate()
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except (psutil.NoSuchProcess, psutil.AccessDenied, psutil.ZombieProcess):
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pass
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try:
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gone, alive = psutil.wait_procs([parent] + children, timeout=2)
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except Exception:
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gone, alive = [], [parent] + children
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for proc in alive:
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try:
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proc.kill()
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except (psutil.NoSuchProcess, psutil.AccessDenied, psutil.ZombieProcess):
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pass
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try:
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gone, alive = psutil.wait_procs([parent] + children, timeout=3)
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except Exception:
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alive = []
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if alive:
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logger.warning(f"process still alive after kill: {[p.pid for p in alive]}")
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else:
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logger.debug("process tree terminated")
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except (psutil.NoSuchProcess, Exception) as e:
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logger.warning(f"force kill failed: {e}")
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def _clean_text(html: str) -> str:
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return re.sub(r'\s+', ' ', re.sub(r'<.*?>', ' ', html)).strip()
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def _looks_like_meta(html: str) -> bool:
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clean = _clean_text(html)
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if not clean:
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return False
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if any(k in clean for k in META_KEYWORDS):
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return True
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return len(clean) <= 80
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def _split_hero(html_body: str):
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title_match = re.search(r'<h1>(.*?)</h1>', html_body, re.S | re.I)
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hero_title = _clean_text(title_match.group(1)) if title_match else "聊天总结"
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remain = re.sub(r'<h1>.*?</h1>', '', html_body, count=1, flags=re.S | re.I).strip()
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block_pattern = re.compile(r'^\s*(<(?:p|blockquote|ul|ol)[^>]*>.*?</(?:p|blockquote|ul|ol)>)', re.S | re.I)
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meta_blocks = []
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for _ in range(4):
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m = block_pattern.match(remain)
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if not m:
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break
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block = m.group(1)
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if not _looks_like_meta(block):
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break
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meta_blocks.append(block.strip())
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remain = remain[m.end():].strip()
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hero_meta = ''.join(meta_blocks)
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hero_enabled = bool(title_match or meta_blocks)
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return hero_title, hero_meta, remain, hero_enabled
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async def md_str_to_html_content(md_content):
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md_content = _extract_stats_pills_from_markdown(md_content)
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if markdown is not None:
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html_body = markdown.markdown(md_content, extensions=['extra', 'codehilite'])
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else:
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html_body = _simple_markdown_to_html(md_content)
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hero_title, hero_meta, remain_html, hero_enabled = _split_hero(html_body)
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css = """
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<style>
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:root {
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--bg1: #0f172a;
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--bg2: #172554;
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--paper: #ffffff;
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--text: #233044;
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--muted: #c7d2e3;
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--muted-2: rgba(235, 241, 255, 0.82);
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--primary: #8b7cff;
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--primary-soft: rgba(109,94,252,0.10);
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--accent: #22c3b5;
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--line: rgba(148,163,184,0.18);
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--code-bg: #0f172a;
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--code-fg: #e2e8f0;
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--quote-bg: rgba(20,184,166,0.08);
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--shadow: 0 20px 45px rgba(80, 84, 125, 0.10);
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}
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* { box-sizing: border-box; }
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html, body { margin: 0; padding: 0; }
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body {
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font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', 'Noto Sans CJK SC', 'Microsoft YaHei', sans-serif;
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color: var(--text);
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font-size: 16px;
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line-height: 1.78;
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background:
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radial-gradient(circle at top left, rgba(126, 93, 255, 0.14) 0%, transparent 28%),
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radial-gradient(circle at top right, rgba(34, 195, 181, 0.12) 0%, transparent 24%),
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linear-gradient(180deg, #eef4fb 0%, #e8f0f8 100%);
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padding: 26px;
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}
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.wrap {
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max-width: 820px;
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margin: 0 auto;
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background: rgba(255,255,255,0.97);
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border: 1px solid rgba(255,255,255,0.7);
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border-radius: 28px;
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box-shadow: var(--shadow);
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overflow: hidden;
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}
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.hero {
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position: relative;
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padding: 30px 34px 24px;
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background:
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radial-gradient(circle at 18% 18%, rgba(255,255,255,0.10) 0%, transparent 18%),
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radial-gradient(circle at 85% 22%, rgba(255,255,255,0.12) 0%, transparent 20%),
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linear-gradient(135deg, #1e1b4b 0%, #1d4ed8 52%, #0f766e 100%);
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border-bottom: 1px solid rgba(255,255,255,0.08);
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}
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.hero::before {
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content: "";
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position: absolute;
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inset: 0;
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background:
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linear-gradient(125deg, rgba(255,255,255,0.05) 0%, transparent 38%),
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linear-gradient(300deg, rgba(255,255,255,0.04) 0%, transparent 30%);
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pointer-events: none;
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}
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.hero::after {
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content: "";
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position: absolute;
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right: -40px;
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top: -36px;
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width: 200px;
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height: 200px;
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border-radius: 50%;
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border: 1px solid rgba(255,255,255,0.12);
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box-shadow: 0 0 0 24px rgba(255,255,255,0.04), 0 0 0 56px rgba(255,255,255,0.025);
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opacity: 0.9;
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pointer-events: none;
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}
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.hero-badge {
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position: relative;
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display: inline-block;
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padding: 6px 12px;
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border-radius: 999px;
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font-size: 12px;
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color: #f8faff;
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background: rgba(255,255,255,0.12);
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border: 1px solid rgba(255,255,255,0.18);
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margin-bottom: 14px;
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letter-spacing: .06em;
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}
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.hero-title {
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position: relative;
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margin: 0;
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font-size: 2.05em;
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line-height: 1.28;
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font-weight: 800;
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color: #ffffff;
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text-align: center;
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letter-spacing: -0.02em;
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text-shadow: 0 2px 10px rgba(0,0,0,0.12);
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}
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.hero-meta {
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position: relative;
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margin: 12px auto 0;
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max-width: 660px;
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text-align: center;
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color: var(--muted-2);
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font-size: 0.84em;
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line-height: 1.72;
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}
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.hero-meta p, .hero-meta blockquote, .hero-meta ul, .hero-meta ol {
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margin: 4px 0;
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color: inherit;
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background: transparent;
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border: none;
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padding: 0;
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}
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.hero-meta ul, .hero-meta ol { list-style: none; padding-left: 0; }
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.content { padding: 24px 34px 34px; }
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h1, h2, h3, h4, h5, h6 {
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color: var(--text);
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margin-top: 24px;
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margin-bottom: 14px;
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font-weight: 700;
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line-height: 1.35;
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letter-spacing: -0.01em;
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}
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.content.hero-active h1:first-of-type { display: none; }
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h2 {
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font-size: 1.42em;
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margin-top: 30px;
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padding: 10px 14px;
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background: linear-gradient(90deg, var(--primary-soft), rgba(255,255,255,0));
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border-left: 4px solid var(--primary);
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border-radius: 12px;
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}
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h3 {
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font-size: 1.15em;
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margin-top: 24px;
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color: #30435f;
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padding-left: 12px;
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border-left: 3px solid rgba(20,184,166,0.55);
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}
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p { margin: 14px 0; color: #334155; line-height: 1.88; }
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ul, ol { padding-left: 26px; margin: 14px 0 18px; }
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li { margin: 8px 0; color: #334155; }
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li::marker { color: var(--primary); }
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strong { color: #1e293b; font-weight: 700; }
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em { color: #5b6b84; }
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code {
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background: rgba(109,94,252,0.08);
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color: #5b3df5;
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padding: 2px 8px;
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border-radius: 8px;
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font-size: 0.92em;
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border: 1px solid rgba(109,94,252,0.10);
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}
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pre {
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background: var(--code-bg);
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color: var(--code-fg);
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padding: 16px 18px;
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border-radius: 16px;
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overflow-x: auto;
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border: 1px solid rgba(255,255,255,0.06);
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box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
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}
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pre code { background: transparent; color: inherit; border: none; padding: 0; }
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table {
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border-collapse: separate;
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border-spacing: 0;
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width: 100%;
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margin: 20px 0;
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background: rgba(255,255,255,0.96);
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border: 1px solid rgba(148,163,184,0.16);
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border-radius: 16px;
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overflow: hidden;
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box-shadow: 0 8px 24px rgba(15,23,42,0.05);
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}
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th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid rgba(148,163,184,0.12); }
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tr:last-child td { border-bottom: none; }
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th { background: linear-gradient(180deg, rgba(109,94,252,0.10), rgba(109,94,252,0.04)); color: #334155; font-weight: 700; }
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blockquote {
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margin: 18px 0;
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padding: 14px 18px;
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background: var(--quote-bg);
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border: 1px solid rgba(20,184,166,0.16);
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border-left: 5px solid var(--accent);
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border-radius: 14px;
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color: #355468;
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}
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.stats-pills {
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display: flex;
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flex-wrap: wrap;
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gap: 10px;
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margin: 12px 0 8px;
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}
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.stats-pill {
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display: inline-flex;
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align-items: center;
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gap: 8px;
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padding: 7px 12px;
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border-radius: 999px;
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font-size: 0.92em;
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line-height: 1;
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border: 1px solid rgba(148,163,184,0.16);
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background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(248,250,252,0.92));
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color: #334155;
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box-shadow: 0 8px 18px rgba(15,23,42,0.05);
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}
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.stats-pill-label {
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display: inline-flex;
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align-items: center;
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justify-content: center;
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padding: 4px 8px;
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border-radius: 999px;
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font-size: 0.82em;
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font-weight: 700;
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color: #ffffff;
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background: linear-gradient(135deg, #64748b, #475569);
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}
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.stats-pill-value {
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font-weight: 800;
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color: #1e293b;
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min-width: 20px;
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}
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.stats-pill-total .stats-pill-label { background: linear-gradient(135deg, #3b82f6, #1d4ed8); }
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.stats-pill-people .stats-pill-label { background: linear-gradient(135deg, #0f766e, #14b8a6); }
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.stats-pill-text .stats-pill-label { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }
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.stats-pill-image .stats-pill-label { background: linear-gradient(135deg, #ec4899, #db2777); }
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.stats-pill-video .stats-pill-label { background: linear-gradient(135deg, #f97316, #ea580c); }
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.stats-pill-link .stats-pill-label { background: linear-gradient(135deg, #22c55e, #16a34a); }
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.stats-pill-emoji .stats-pill-label { background: linear-gradient(135deg, #eab308, #ca8a04); }
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hr { border: none; height: 1px; background: linear-gradient(90deg, transparent, rgba(148,163,184,0.35), transparent); margin: 26px 0; }
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a { color: var(--primary); text-decoration: none; border-bottom: 1px dashed rgba(109,94,252,0.35); }
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.signature { margin-top: 34px; text-align: right; color: #73849c; font-size: 0.95em; font-style: italic; }
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</style>
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"""
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|
||
hero_html = ''
|
||
content_class = 'content hero-active' if hero_enabled else 'content'
|
||
if hero_enabled:
|
||
hero_html = f'''
|
||
<div class="hero">
|
||
<div class="hero-badge">AI 群聊总结</div>
|
||
<h1 class="hero-title">{hero_title}</h1>
|
||
<div class="hero-meta">{hero_meta}</div>
|
||
</div>'''
|
||
|
||
full_html = f'''<html>
|
||
<head>
|
||
<meta charset="UTF-8">
|
||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||
{css}
|
||
</head>
|
||
<body>
|
||
<div class="wrap">{hero_html}
|
||
<div class="{content_class}">
|
||
{remain_html if hero_enabled else html_body}
|
||
</div>
|
||
</div>
|
||
</body>
|
||
</html>'''
|
||
return full_html
|
||
|
||
|
||
def check_chromium_installed(path):
|
||
return os.path.isfile(path) and os.access(path, os.X_OK)
|
||
|
||
|
||
def _collect_browser_candidates() -> list[Tuple[str, str]]:
|
||
candidates = []
|
||
if os.name == 'nt':
|
||
possible_chrome_paths = [
|
||
r"C:\Users\Liu_WIN10\AppData\Local\Google\Chrome\Application\chrome.exe",
|
||
r"C:\Users\Liu-OPEN\AppData\Local\Google\Chrome\Application\chrome.exe",
|
||
r"C:\Program Files\Google\Chrome\Application\chrome.exe",
|
||
r"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe",
|
||
]
|
||
for path in possible_chrome_paths:
|
||
if check_chromium_installed(path):
|
||
candidates.append(("system", path))
|
||
else:
|
||
import glob
|
||
for bin_name in ("google-chrome", "google-chrome-stable", "chromium", "chromium-browser"):
|
||
bin_path = shutil.which(bin_name)
|
||
if bin_path and check_chromium_installed(bin_path):
|
||
candidates.append(("system", bin_path))
|
||
user_home = os.path.expanduser("~")
|
||
glob_pattern = os.path.join(user_home, ".cache", "ms-playwright", "chromium-*", "chrome-linux", "chrome")
|
||
chrome_paths = glob.glob(glob_pattern)
|
||
for path in sorted(chrome_paths, reverse=True):
|
||
if check_chromium_installed(path):
|
||
candidates.append(("playwright-cache", path))
|
||
return candidates
|
||
|
||
|
||
class _PersistentBrowser:
|
||
"""常驻浏览器管理器。
|
||
|
||
目标：避免每次截图都冷启动 Chromium，降低失败率并提升速度。
|
||
"""
|
||
|
||
def __init__(self):
|
||
self._playwright = None
|
||
self._browser = None
|
||
self._lock = asyncio.Lock()
|
||
self._launch_args = ["--no-sandbox", "--disable-setuid-sandbox", "--disable-dev-shm-usage", "--disable-gpu"]
|
||
self._last_launch_source = "unknown"
|
||
# 记录当前常驻浏览器所属事件循环，避免跨 loop 复用导致的句柄异常。
|
||
self._owner_loop_id: Optional[int] = None
|
||
|
||
async def _launch_browser(self):
|
||
if self._playwright is None:
|
||
self._playwright = await async_playwright().start()
|
||
|
||
for source, browser_path in _collect_browser_candidates():
|
||
try:
|
||
logger.debug(f"Launch chromium with {source}: {browser_path}")
|
||
browser = await self._playwright.chromium.launch(
|
||
executable_path=browser_path,
|
||
args=self._launch_args,
|
||
timeout=20000,
|
||
)
|
||
self._last_launch_source = f"{source}:{browser_path}"
|
||
return browser
|
||
except Exception as e:
|
||
logger.warning(f"Launch chromium failed with {source}: {browser_path}, error={e}")
|
||
|
||
logger.debug("Launch chromium with bundled browser")
|
||
browser = await self._playwright.chromium.launch(args=self._launch_args)
|
||
self._last_launch_source = "bundled"
|
||
return browser
|
||
|
||
async def ensure_browser(self):
|
||
current_loop_id = id(asyncio.get_running_loop())
|
||
if self._owner_loop_id is not None and self._owner_loop_id != current_loop_id:
|
||
# 发生跨事件循环访问时，主动丢弃旧句柄并在新 loop 重建。
|
||
# 注意：旧 loop 中的进程资源可能已被 runtime 回收，这里不再尝试跨 loop 强关，避免引入新死锁点。
|
||
logger.warning(
|
||
f"[md2img] 检测到跨事件循环复用，准备重建常驻浏览器: "
|
||
f"owner_loop={self._owner_loop_id}, current_loop={current_loop_id}"
|
||
)
|
||
self._browser = None
|
||
self._playwright = None
|
||
self._owner_loop_id = None
|
||
|
||
if self._browser and self._browser.is_connected():
|
||
return self._browser
|
||
async with self._lock:
|
||
if self._browser and self._browser.is_connected():
|
||
return self._browser
|
||
# 浏览器失联时先做一次清理，避免残留句柄影响重建。
|
||
if self._browser:
|
||
try:
|
||
await safe_close_browser(self._browser)
|
||
except Exception:
|
||
pass
|
||
self._browser = None
|
||
self._browser = await self._launch_browser()
|
||
self._owner_loop_id = current_loop_id
|
||
browser_pid = getattr(getattr(self._browser, "process", None), "pid", None)
|
||
logger.info(
|
||
f"[md2img] 常驻浏览器就绪: source={self._last_launch_source}, "
|
||
f"loop={self._owner_loop_id}, pid={browser_pid}"
|
||
)
|
||
return self._browser
|
||
|
||
async def restart_browser(self):
|
||
async with self._lock:
|
||
if self._browser:
|
||
try:
|
||
await safe_close_browser(self._browser)
|
||
except Exception:
|
||
pass
|
||
self._browser = None
|
||
self._browser = await self._launch_browser()
|
||
self._owner_loop_id = id(asyncio.get_running_loop())
|
||
browser_pid = getattr(getattr(self._browser, "process", None), "pid", None)
|
||
logger.info(
|
||
f"[md2img] 常驻浏览器已重建: source={self._last_launch_source}, "
|
||
f"loop={self._owner_loop_id}, pid={browser_pid}"
|
||
)
|
||
return self._browser
|
||
|
||
async def screenshot(self, html_content: str, output_image: str):
|
||
browser = await self.ensure_browser()
|
||
|
||
async def _capture_with_browser(active_browser):
|
||
context = await active_browser.new_context(viewport={"width": 780, "height": 960}, device_scale_factor=1.2)
|
||
try:
|
||
page = await context.new_page()
|
||
logger.debug("Set page content")
|
||
await page.set_content(html_content, wait_until='domcontentloaded', timeout=15000)
|
||
logger.debug("Wait for fonts ready")
|
||
await page.evaluate("document.fonts.ready")
|
||
await asyncio.sleep(0.2)
|
||
logger.debug(f"Take screenshot: output={output_image}")
|
||
await page.screenshot(path=output_image, full_page=True, timeout=15000, animations="disabled")
|
||
if not os.path.exists(output_image):
|
||
raise RuntimeError(f"截图失败，输出文件不存在: {output_image}")
|
||
finally:
|
||
try:
|
||
await context.close()
|
||
except Exception:
|
||
pass
|
||
|
||
try:
|
||
await _capture_with_browser(browser)
|
||
except Exception as e:
|
||
# 首次失败后重建一次浏览器再重试，提升抗偶发故障能力。
|
||
logger.warning(f"[md2img] 常驻浏览器截图失败，准备重建后重试: {e}")
|
||
browser = await self.restart_browser()
|
||
await _capture_with_browser(browser)
|
||
|
||
|
||
_BROWSER_MANAGER: Optional[_PersistentBrowser] = None
|
||
_MD2IMG_RUNTIME = None
|
||
|
||
|
||
class _Md2ImgRuntime:
|
||
"""Markdown 转图专用运行时。
|
||
|
||
设计目的：
|
||
1. 在独立线程中维护唯一事件循环，所有浏览器操作都在这个 loop 执行；
|
||
2. 彻底避免“预热在 A loop、截图在 B loop”的跨 loop 复用问题；
|
||
3. 为消息处理与定时任务提供统一稳定的浏览器执行上下文。
|
||
"""
|
||
|
||
def __init__(self):
|
||
self._thread: Optional[threading.Thread] = None
|
||
self._loop: Optional[asyncio.AbstractEventLoop] = None
|
||
self._lock = threading.Lock()
|
||
self._ready = threading.Event()
|
||
|
||
@property
|
||
def loop(self) -> Optional[asyncio.AbstractEventLoop]:
|
||
return self._loop
|
||
|
||
def _thread_main(self):
|
||
"""运行时线程入口：创建并常驻事件循环。"""
|
||
loop = asyncio.new_event_loop()
|
||
asyncio.set_event_loop(loop)
|
||
self._loop = loop
|
||
self._ready.set()
|
||
logger.info(f"[md2img] 专用运行时已启动: thread={threading.current_thread().name}, loop={id(loop)}")
|
||
loop.run_forever()
|
||
|
||
def ensure_started(self):
|
||
"""确保运行时已启动（幂等）。"""
|
||
if self._thread and self._thread.is_alive() and self._loop and self._loop.is_running():
|
||
return
|
||
with self._lock:
|
||
if self._thread and self._thread.is_alive() and self._loop and self._loop.is_running():
|
||
return
|
||
self._ready.clear()
|
||
self._thread = threading.Thread(target=self._thread_main, name="md2img-runtime", daemon=True)
|
||
self._thread.start()
|
||
if not self._ready.wait(timeout=10):
|
||
raise RuntimeError("md2img 专用运行时启动超时")
|
||
|
||
def submit(self, coro) -> ConcurrentFuture:
|
||
"""向专用运行时提交协程任务。"""
|
||
self.ensure_started()
|
||
if not self._loop:
|
||
raise RuntimeError("md2img 运行时事件循环未就绪")
|
||
return asyncio.run_coroutine_threadsafe(coro, self._loop)
|
||
|
||
|
||
def _get_md2img_runtime() -> _Md2ImgRuntime:
|
||
global _MD2IMG_RUNTIME
|
||
if _MD2IMG_RUNTIME is None:
|
||
_MD2IMG_RUNTIME = _Md2ImgRuntime()
|
||
return _MD2IMG_RUNTIME
|
||
|
||
|
||
async def _run_in_md2img_runtime(coro, timeout_seconds: Optional[int] = None):
|
||
"""在 md2img 专用事件循环中执行协程，并在当前调用方 loop 中异步等待结果。"""
|
||
runtime = _get_md2img_runtime()
|
||
runtime.ensure_started()
|
||
target_loop = runtime.loop
|
||
current_loop = asyncio.get_running_loop()
|
||
|
||
# 若当前已在专用 loop 内，直接执行，避免不必要的线程跳转。
|
||
if target_loop is current_loop:
|
||
if timeout_seconds is not None:
|
||
return await asyncio.wait_for(coro, timeout=max(1, int(timeout_seconds)))
|
||
return await coro
|
||
|
||
future = runtime.submit(coro)
|
||
awaitable_future = asyncio.wrap_future(future)
|
||
if timeout_seconds is not None:
|
||
return await asyncio.wait_for(awaitable_future, timeout=max(1, int(timeout_seconds)))
|
||
return awaitable_future
|
||
|
||
|
||
def _get_browser_manager() -> _PersistentBrowser:
|
||
global _BROWSER_MANAGER
|
||
if _BROWSER_MANAGER is None:
|
||
_BROWSER_MANAGER = _PersistentBrowser()
|
||
return _BROWSER_MANAGER
|
||
|
||
|
||
async def warmup_md2img_browser(timeout_seconds: int = 45) -> bool:
|
||
"""预热 Markdown 转图浏览器（异步）。
|
||
|
||
设计目的：
|
||
1. 服务启动后提前完成浏览器冷启动，减少首个截图任务的等待和失败概率；
|
||
2. 不执行实际业务截图，仅确保常驻浏览器已可用。
|
||
"""
|
||
try:
|
||
logger.info(f"[md2img] 开始浏览器预热: caller_loop={id(asyncio.get_running_loop())}, timeout={int(timeout_seconds)}s")
|
||
|
||
async def _warmup_impl():
|
||
manager = _get_browser_manager()
|
||
await asyncio.wait_for(manager.ensure_browser(), timeout=max(10, int(timeout_seconds)))
|
||
browser = manager._browser
|
||
browser_pid = getattr(getattr(browser, "process", None), "pid", None) if browser else None
|
||
logger.info(f"[md2img] 浏览器预热完成: runtime_loop={id(asyncio.get_running_loop())}, pid={browser_pid}")
|
||
return True
|
||
|
||
await _run_in_md2img_runtime(_warmup_impl(), timeout_seconds=max(10, int(timeout_seconds) + 5))
|
||
return True
|
||
except Exception as e:
|
||
logger.error(f"[md2img] 浏览器预热失败: {e}")
|
||
return False
|
||
|
||
|
||
def warmup_md2img_browser_sync(timeout_seconds: int = 45) -> bool:
|
||
"""预热 Markdown 转图浏览器（同步包装，适合在线程中调用）。"""
|
||
try:
|
||
return asyncio.run(warmup_md2img_browser(timeout_seconds=timeout_seconds))
|
||
except Exception as e:
|
||
logger.error(f"[md2img] 同步预热执行失败: {e}")
|
||
return False
|
||
|
||
|
||
async def html_to_image(html_content, output_image):
|
||
"""将 HTML 渲染为图片。
|
||
|
||
说明：
|
||
1. 实际截图逻辑固定在 md2img 专用事件循环执行；
|
||
2. 调用方无论来自哪个线程/loop，都只会复用同一套常驻浏览器。
|
||
"""
|
||
|
||
async def _html_to_image_impl():
|
||
manager = _get_browser_manager()
|
||
await manager.screenshot(html_content, output_image)
|
||
|
||
await _run_in_md2img_runtime(_html_to_image_impl())
|
||
|
||
|
||
async def _await_with_progress(coro, timeout_seconds: int, stage_name: str, progress_interval_seconds: int = 10):
|
||
"""等待协程并周期输出进度，避免长时间无日志看起来像假死。"""
|
||
task = asyncio.create_task(coro)
|
||
start_ts = time.monotonic()
|
||
next_progress_at = progress_interval_seconds
|
||
try:
|
||
while True:
|
||
done, _ = await asyncio.wait({task}, timeout=1.0)
|
||
if done:
|
||
return task.result()
|
||
elapsed = int(time.monotonic() - start_ts)
|
||
if elapsed >= next_progress_at:
|
||
logger.info(f"[md2img] 阶段进行中: {stage_name}, elapsed={elapsed}s/{timeout_seconds}s")
|
||
next_progress_at += progress_interval_seconds
|
||
if elapsed >= timeout_seconds:
|
||
task.cancel()
|
||
raise asyncio.TimeoutError(f"[md2img] 阶段超时: {stage_name}, timeout={timeout_seconds}s")
|
||
finally:
|
||
if not task.done():
|
||
task.cancel()
|
||
|
||
|
||
async def convert_md_str_to_image(
|
||
md_content: str,
|
||
output_image: str,
|
||
max_retries: int = 2,
|
||
render_timeout_seconds: int = 90,
|
||
html_timeout_seconds: int = 30,
|
||
) -> str:
|
||
if not md_content:
|
||
raise ValueError("Markdown content cannot be empty")
|
||
|
||
project_root = os.getcwd()
|
||
temp_dir = Path(project_root) / "temp" / "md2image"
|
||
temp_dir.mkdir(parents=True, exist_ok=True)
|
||
output_image_path = temp_dir / output_image
|
||
|
||
last_error = None
|
||
for attempt in range(max_retries):
|
||
try:
|
||
attempt_no = attempt + 1
|
||
logger.debug(
|
||
f"尝试第 {attempt_no}/{max_retries} 次生成图片 "
|
||
f"(html_timeout={html_timeout_seconds}s, render_timeout={render_timeout_seconds}s)"
|
||
)
|
||
if output_image_path.exists():
|
||
os.remove(str(output_image_path))
|
||
stage_start = time.monotonic()
|
||
# 阶段一：Markdown -> HTML。加超时可避免极端文本导致长期阻塞。
|
||
logger.info(f"[md2img] 开始阶段: markdown_to_html, attempt={attempt_no}/{max_retries}")
|
||
full_html = await _await_with_progress(
|
||
md_str_to_html_content(md_content),
|
||
timeout_seconds=max(5, int(html_timeout_seconds)),
|
||
stage_name="markdown_to_html",
|
||
)
|
||
logger.debug(f"第 {attempt_no} 次 HTML 生成耗时: {time.monotonic() - stage_start:.2f}s")
|
||
|
||
# 阶段二：Playwright 渲染截图。加超时防止浏览器进程异常卡死。
|
||
stage_start = time.monotonic()
|
||
logger.info(f"[md2img] 开始阶段: html_to_image, attempt={attempt_no}/{max_retries}")
|
||
await _await_with_progress(
|
||
html_to_image(full_html, str(output_image_path)),
|
||
timeout_seconds=max(10, int(render_timeout_seconds)),
|
||
stage_name="html_to_image",
|
||
)
|
||
logger.debug(f"第 {attempt_no} 次截图耗时: {time.monotonic() - stage_start:.2f}s")
|
||
|
||
image_size = os.path.getsize(str(output_image_path))
|
||
if image_size < 1024:
|
||
raise RuntimeError(f"图片生成异常，大小仅为: {image_size} bytes")
|
||
logger.info(f"图片成功生成：{output_image_path}")
|
||
return str(output_image_path.resolve())
|
||
except asyncio.TimeoutError as e:
|
||
last_error = RuntimeError(
|
||
f"图片生成超时(attempt={attempt_no}/{max_retries}, "
|
||
f"html_timeout={html_timeout_seconds}s, render_timeout={render_timeout_seconds}s)"
|
||
)
|
||
logger.warning(str(last_error))
|
||
except Exception as e:
|
||
last_error = e
|
||
logger.warning(f"第 {attempt_no} 次尝试失败: {e}")
|
||
if attempt < max_retries - 1:
|
||
await asyncio.sleep(1.5)
|
||
|
||
raise RuntimeError(f"图片生成失败，已重试 {max_retries} 次。最后错误: {last_error}")
|