fix: prevent Chromium zombie leak in htmlToPdf

- Wrap browser lifecycle in try/finally so browser.close() always runs
- Fall back to SIGKILL of browser.process() if close() fails
- Add --disable-dev-shm-usage to launch args (container stability)
- Add tini as ENTRYPOINT in Dockerfile for defense in depth
- Bump version to 1.0.2

Dockerfile

@@ -4,6 +4,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     chromium \
     fonts-freefont-ttf \
     fonts-noto-cjk \
+    tini \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
@@ -21,4 +22,5 @@ EXPOSE 3000
 HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
   CMD node -e "require('http').get('http://localhost:3000/health', r => process.exit(r.statusCode === 200 ? 0 : 1))"
 
+ENTRYPOINT ["/usr/bin/tini", "--"]
 CMD ["node", "server.js"]

convert.js

@@ -235,43 +235,52 @@ async function htmlToPdf(html) {
 
   const browser = await puppeteer.launch({
     executablePath: process.env.CHROME_PATH || "/usr/bin/google-chrome-stable",
-    args: ["--no-sandbox", "--disable-setuid-sandbox"],
+    args: ["--no-sandbox", "--disable-setuid-sandbox", "--disable-dev-shm-usage"],
   });
-  const page = await browser.newPage();
+  try {
+    const page = await browser.newPage();
 
-  const htmlForPdf = html.replace(
-    /<script src="https:\/\/cdn\.jsdelivr\.net\/npm\/mermaid@[^"]*"><\/script>/,
-    ""
-  );
-  await page.setContent(htmlForPdf, { waitUntil: "domcontentloaded" });
-
-  const hasMermaid = await page.evaluate(
-    () => document.querySelectorAll("pre.mermaid").length > 0
-  );
-  if (hasMermaid) {
-    const mermaidJs = fs.readFileSync(
-      path.join(__dirname, "mermaid.min.js"),
-      "utf-8"
+    const htmlForPdf = html.replace(
+      /<script src="https:\/\/cdn\.jsdelivr\.net\/npm\/mermaid@[^"]*"><\/script>/,
+      ""
     );
-    await page.addScriptTag({ content: mermaidJs });
-    await page.evaluate(() => {
-      mermaid.initialize({
-        startOnLoad: false,
-        theme: "default",
-        flowchart: { useMaxWidth: true, htmlLabels: true, curve: "basis" },
-        securityLevel: "loose",
-      });
-      return mermaid.run({ querySelector: "pre.mermaid" });
-    });
-  }
+    await page.setContent(htmlForPdf, { waitUntil: "domcontentloaded" });
 
-  const pdfBuffer = await page.pdf({
-    format: "A4",
-    printBackground: true,
-    margin: { top: "20mm", bottom: "20mm", left: "15mm", right: "15mm" },
-  });
-  await browser.close();
-  return pdfBuffer;
+    const hasMermaid = await page.evaluate(
+      () => document.querySelectorAll("pre.mermaid").length > 0
+    );
+    if (hasMermaid) {
+      const mermaidJs = fs.readFileSync(
+        path.join(__dirname, "mermaid.min.js"),
+        "utf-8"
+      );
+      await page.addScriptTag({ content: mermaidJs });
+      await page.evaluate(() => {
+        mermaid.initialize({
+          startOnLoad: false,
+          theme: "default",
+          flowchart: { useMaxWidth: true, htmlLabels: true, curve: "basis" },
+          securityLevel: "loose",
+        });
+        return mermaid.run({ querySelector: "pre.mermaid" });
+      });
+    }
+
+    const pdfBuffer = await page.pdf({
+      format: "A4",
+      printBackground: true,
+      margin: { top: "20mm", bottom: "20mm", left: "15mm", right: "15mm" },
+    });
+    return pdfBuffer;
+  } finally {
+    try {
+      await browser.close();
+    } catch (e) {
+      try {
+        browser.process()?.kill("SIGKILL");
+      } catch (_) {}
+    }
+  }
 }
 
 module.exports = { markdownToHtml, htmlToPdf };

package.json

@@ -1,6 +1,6 @@
 {
   "name": "md2html",
-  "version": "1.0.0",
+  "version": "1.0.2",
   "description": "",
   "main": "index.js",
   "scripts": {