Sandbox - Process not getting started

[rakeshar3796]

When i try to preview a react application using sandbox, in local dev am able to get the preview url when i deploy and check it am observing its getting stuck somewhere in between and the request isn't getting fulfilled.

Code

import {
  getSandbox,
  proxyToSandbox,
  parseSSEStream,
} from "@cloudflare/sandbox";

// Request timeout - 3 minutes
const REQUEST_TIMEOUT_MS = 3 * 60 * 1000;

/**
 * Wrap a promise with a timeout
 */
function withTimeout(promise, ms, timeoutMessage = "Request timeout") {
  let timeoutId;
  const timeoutPromise = new Promise((_, reject) => {
    timeoutId = setTimeout(() => {
      reject(new Error(timeoutMessage));
    }, ms);
  });

  return Promise.race([promise, timeoutPromise]).finally(() => {
    clearTimeout(timeoutId);
  });
}

const app1Files = {
  ".gitignore":
    "# Logs\nlogs\n*.log\nnpm-debug.log*\nyarn-debug.log*\nyarn-error.log*\npnpm-debug.log*\nlerna-debug.log*\n\nnode_modules\ndist\ndist-ssr\n*.local\n\n# Editor directories and files\n.vscode/*\n!.vscode/extensions.json\n.idea\n.DS_Store\n*.suo\n*.ntvs*\n*.njsproj\n*.sln\n*.sw?\n",
  "README.md":
    "# React + Vite\n\nThis template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.\n\nCurrently, two official plugins are available:\n\n- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Babel](https://babeljs.io/) (or [oxc](https://oxc.rs) when used in [rolldown-vite](https://vite.dev/guide/rolldown)) for Fast Refresh\n- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh\n\n## React Compiler\n\nThe React Compiler is not enabled on this template because of its impact on dev & build performances. To add it, see [this documentation](https://react.dev/learn/react-compiler/installation).\n\n## Expanding the ESLint configuration\n\nIf you are developing a production application, we recommend using TypeScript with type-aware lint rules enabled. Check out the [TS template](https://github.com/vitejs/vite/tree/main/packages/create-vite/template-react-ts) for information on how to integrate TypeScript and [`typescript-eslint`](https://typescript-eslint.io) in your project.\n",
  "eslint.config.js":
    "import js from '@eslint/js'\nimport globals from 'globals'\nimport reactHooks from 'eslint-plugin-react-hooks'\nimport reactRefresh from 'eslint-plugin-react-refresh'\nimport { defineConfig, globalIgnores } from 'eslint/config'\n\nexport default defineConfig([\n  globalIgnores(['dist']),\n  {\n    files: ['**/*.{js,jsx}'],\n    extends: [\n      js.configs.recommended,\n      reactHooks.configs.flat.recommended,\n      reactRefresh.configs.vite,\n    ],\n    languageOptions: {\n      ecmaVersion: 2020,\n      globals: globals.browser,\n      parserOptions: {\n        ecmaVersion: 'latest',\n        ecmaFeatures: { jsx: true },\n        sourceType: 'module',\n      },\n    },\n    rules: {\n      'no-unused-vars': ['error', { varsIgnorePattern: '^[A-Z_]' }],\n    },\n  },\n])\n",
  "generate-files-json.js":
    "import fs from 'fs';\nimport path from 'path';\nimport process from 'process';\n\nfunction shouldExclude(filePath, fileName) {\n  // Exclude node_modules directory and package-lock.json\n  const excludePatterns = ['node_modules', 'package-lock.json'];\n\n  // Check if path contains node_modules\n  if (filePath.includes('node_modules')) {\n    return true;\n  }\n\n  // Check if filename matches exclusion patterns\n  if (excludePatterns.includes(fileName)) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction readDirectoryRecursive(dirPath, baseDir = dirPath) {\n  const result = {};\n\n  try {\n    const entries = fs.readdirSync(dirPath, { withFileTypes: true });\n\n    for (const entry of entries) {\n      const fullPath = path.join(dirPath, entry.name);\n\n      // Skip excluded files/directories\n      if (shouldExclude(fullPath, entry.name)) {\n        continue;\n      }\n\n      if (entry.isDirectory()) {\n        // Recursively read subdirectory\n        const subDirContents = readDirectoryRecursive(fullPath, baseDir);\n        Object.assign(result, subDirContents);\n      } else if (entry.isFile()) {\n        try {\n          // Get relative path from base directory\n          const relativePath = path.relative(baseDir, fullPath);\n\n          // Read file contents\n          const contents = fs.readFileSync(fullPath, 'utf8');\n          result[relativePath] = contents;\n        } catch (err) {\n          // If we can't read the file (binary, permissions, etc), store error message\n          const relativePath = path.relative(baseDir, fullPath);\n          result[relativePath] = `[Error reading file: ${err.message}]`;\n        }\n      }\n    }\n  } catch (err) {\n    console.error(`Error reading directory ${dirPath}:`, err.message);\n  }\n\n  return result;\n}\n\n// Main execution\nconst currentDir = process.cwd();\nconsole.log(`Reading directory: ${currentDir}`);\nconsole.log('Excluding: node_modules, package-lock.json\\n');\n\nconst filesDict = readDirectoryRecursive(currentDir);\n\n// Output as JSON\nconst jsonOutput = JSON.stringify(filesDict, null, 2);\nconsole.log(jsonOutput);\n\n// Optionally write to file\nconst outputFile = 'directory-contents.json';\nfs.writeFileSync(outputFile, jsonOutput, 'utf8');\nconsole.error(`\\n✓ JSON output also saved to: ${outputFile}`);\n",
  "index.html":
    '<!doctype html>\n<html lang="en">\n  <head>\n    <meta charset="UTF-8" />\n    <link rel="icon" type="image/svg+xml" href="/vite.svg" />\n    <meta name="viewport" content="width=device-width, initial-scale=1.0" />\n    <title>sandbox-sdk</title>\n  </head>\n  <body>\n    <div id="root"></div>\n    <script type="module" src="/src/main.jsx"></script>\n  </body>\n</html>\n',
  "package.json":
    '{\n  "name": "sandbox-sdk",\n  "private": true,\n  "version": "0.0.0",\n  "type": "module",\n  "scripts": {\n    "dev": "vite",\n    "build": "vite build",\n    "lint": "eslint .",\n    "preview": "vite preview"\n  },\n  "dependencies": {\n    "react": "^19.2.0",\n    "react-dom": "^19.2.0"\n  },\n  "devDependencies": {\n    "@eslint/js": "^9.39.1",\n    "@types/react": "^19.2.2",\n    "@types/react-dom": "^19.2.2",\n    "@vitejs/plugin-react": "^5.1.0",\n    "eslint": "^9.39.1",\n    "eslint-plugin-react-hooks": "^7.0.1",\n    "eslint-plugin-react-refresh": "^0.4.24",\n    "globals": "^16.5.0",\n    "vite": "^7.2.2"\n  }\n}\n',
  "public/vite.svg":
    '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFEA83"></stop><stop offset="8.333%" stop-color="#FFDD35"></stop><stop offset="100%" stop-color="#FFA800"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>',
  "src/App.css":
    "#root {\n  max-width: 1280px;\n  margin: 0 auto;\n  padding: 2rem;\n  text-align: center;\n}\n\n.logo {\n  height: 6em;\n  padding: 1.5em;\n  will-change: filter;\n  transition: filter 300ms;\n}\n.logo:hover {\n  filter: drop-shadow(0 0 2em #646cffaa);\n}\n.logo.react:hover {\n  filter: drop-shadow(0 0 2em #61dafbaa);\n}\n\n@keyframes logo-spin {\n  from {\n    transform: rotate(0deg);\n  }\n  to {\n    transform: rotate(360deg);\n  }\n}\n\n@media (prefers-reduced-motion: no-preference) {\n  a:nth-of-type(2) .logo {\n    animation: logo-spin infinite 20s linear;\n  }\n}\n\n.card {\n  padding: 2em;\n}\n\n.read-the-docs {\n  color: #888;\n}\n",
  "src/App.jsx":
    'import { useState } from \'react\'\nimport reactLogo from \'./assets/react.svg\'\nimport viteLogo from \'/vite.svg\'\nimport \'./App.css\'\n\nfunction App() {\n  const [count, setCount] = useState(0)\n\n  return (\n    <>\n      <div>\n        <a href="https://vite.dev" target="_blank">\n          <img src={viteLogo} className="logo" alt="Vite logo" />\n        </a>\n        <a href="https://react.dev" target="_blank">\n          <img src={reactLogo} className="logo react" alt="React logo" />\n        </a>\n      </div>\n      <h1>Vite + React</h1>\n      <div className="card">\n        <button onClick={() => setCount((count) => count + 1)}>\n          count is {count}\n        </button>\n        <p>\n          Edit <code>src/App.jsx</code> and save to test HMR\n        </p>\n      </div>\n      <p className="read-the-docs">\n        Click on the Vite and React logos to learn more\n      </p>\n    </>\n  )\n}\n\nexport default App\n',
  "src/assets/react.svg":
    '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="35.93" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 228"><path fill="#00D8FF" d="M210.483 73.824a171.49 171.49 0 0 0-8.24-2.597c.465-1.9.893-3.777 1.273-5.621c6.238-30.281 2.16-54.676-11.769-62.708c-13.355-7.7-35.196.329-57.254 19.526a171.23 171.23 0 0 0-6.375 5.848a155.866 155.866 0 0 0-4.241-3.917C100.759 3.829 77.587-4.822 63.673 3.233C50.33 10.957 46.379 33.89 51.995 62.588a170.974 170.974 0 0 0 1.892 8.48c-3.28.932-6.445 1.924-9.474 2.98C17.309 83.498 0 98.307 0 113.668c0 15.865 18.582 31.778 46.812 41.427a145.52 145.52 0 0 0 6.921 2.165a167.467 167.467 0 0 0-2.01 9.138c-5.354 28.2-1.173 50.591 12.134 58.266c13.744 7.926 36.812-.22 59.273-19.855a145.567 145.567 0 0 0 5.342-4.923a168.064 168.064 0 0 0 6.92 6.314c21.758 18.722 43.246 26.282 56.54 18.586c13.731-7.949 18.194-32.003 12.4-61.268a145.016 145.016 0 0 0-1.535-6.842c1.62-.48 3.21-.974 4.76-1.488c29.348-9.723 48.443-25.443 48.443-41.52c0-15.417-17.868-30.326-45.517-39.844Zm-6.365 70.984c-1.4.463-2.836.91-4.3 1.345c-3.24-10.257-7.612-21.163-12.963-32.432c5.106-11 9.31-21.767 12.459-31.957c2.619.758 5.16 1.557 7.61 2.4c23.69 8.156 38.14 20.213 38.14 29.504c0 9.896-15.606 22.743-40.946 31.14Zm-10.514 20.834c2.562 12.94 2.927 24.64 1.23 33.787c-1.524 8.219-4.59 13.698-8.382 15.893c-8.067 4.67-25.32-1.4-43.927-17.412a156.726 156.726 0 0 1-6.437-5.87c7.214-7.889 14.423-17.06 21.459-27.246c12.376-1.098 24.068-2.894 34.671-5.345a134.17 134.17 0 0 1 1.386 6.193ZM87.276 214.515c-7.882 2.783-14.16 2.863-17.955.675c-8.075-4.657-11.432-22.636-6.853-46.752a156.923 156.923 0 0 1 1.869-8.499c10.486 2.32 22.093 3.988 34.498 4.994c7.084 9.967 14.501 19.128 21.976 27.15a134.668 134.668 0 0 1-4.877 4.492c-9.933 8.682-19.886 14.842-28.658 17.94ZM50.35 144.747c-12.483-4.267-22.792-9.812-29.858-15.863c-6.35-5.437-9.555-10.836-9.555-15.216c0-9.322 13.897-21.212 37.076-29.293c2.813-.98 5.757-1.905 8.812-2.773c3.204 10.42 7.406 21.315 12.477 32.332c-5.137 11.18-9.399 22.249-12.634 32.792a134.718 134.718 0 0 1-6.318-1.979Zm12.378-84.26c-4.811-24.587-1.616-43.134 6.425-47.789c8.564-4.958 27.502 2.111 47.463 19.835a144.318 144.318 0 0 1 3.841 3.545c-7.438 7.987-14.787 17.08-21.808 26.988c-12.04 1.116-23.565 2.908-34.161 5.309a160.342 160.342 0 0 1-1.76-7.887Zm110.427 27.268a347.8 347.8 0 0 0-7.785-12.803c8.168 1.033 15.994 2.404 23.343 4.08c-2.206 7.072-4.956 14.465-8.193 22.045a381.151 381.151 0 0 0-7.365-13.322Zm-45.032-43.861c5.044 5.465 10.096 11.566 15.065 18.186a322.04 322.04 0 0 0-30.257-.006c4.974-6.559 10.069-12.652 15.192-18.18ZM82.802 87.83a323.167 323.167 0 0 0-7.227 13.238c-3.184-7.553-5.909-14.98-8.134-22.152c7.304-1.634 15.093-2.97 23.209-3.984a321.524 321.524 0 0 0-7.848 12.897Zm8.081 65.352c-8.385-.936-16.291-2.203-23.593-3.793c2.26-7.3 5.045-14.885 8.298-22.6a321.187 321.187 0 0 0 7.257 13.246c2.594 4.48 5.28 8.868 8.038 13.147Zm37.542 31.03c-5.184-5.592-10.354-11.779-15.403-18.433c4.902.192 9.899.29 14.978.29c5.218 0 10.376-.117 15.453-.343c-4.985 6.774-10.018 12.97-15.028 18.486Zm52.198-57.817c3.422 7.8 6.306 15.345 8.596 22.52c-7.422 1.694-15.436 3.058-23.88 4.071a382.417 382.417 0 0 0 7.859-13.026a347.403 347.403 0 0 0 7.425-13.565Zm-16.898 8.101a358.557 358.557 0 0 1-12.281 19.815a329.4 329.4 0 0 1-23.444.823c-7.967 0-15.716-.248-23.178-.732a310.202 310.202 0 0 1-12.513-19.846h.001a307.41 307.41 0 0 1-10.923-20.627a310.278 310.278 0 0 1 10.89-20.637l-.001.001a307.318 307.318 0 0 1 12.413-19.761c7.613-.576 15.42-.876 23.31-.876H128c7.926 0 15.743.303 23.354.883a329.357 329.357 0 0 1 12.335 19.695a358.489 358.489 0 0 1 11.036 20.54a329.472 329.472 0 0 1-11 20.722Zm22.56-122.124c8.572 4.944 11.906 24.881 6.52 51.026c-.344 1.668-.73 3.367-1.15 5.09c-10.622-2.452-22.155-4.275-34.23-5.408c-7.034-10.017-14.323-19.124-21.64-27.008a160.789 160.789 0 0 1 5.888-5.4c18.9-16.447 36.564-22.941 44.612-18.3ZM128 90.808c12.625 0 22.86 10.235 22.86 22.86s-10.235 22.86-22.86 22.86s-22.86-10.235-22.86-22.86s10.235-22.86 22.86-22.86Z"></path></svg>',
  "src/index.css":
    ":root {\n  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;\n  line-height: 1.5;\n  font-weight: 400;\n\n  color-scheme: light dark;\n  color: rgba(255, 255, 255, 0.87);\n  background-color: #242424;\n\n  font-synthesis: none;\n  text-rendering: optimizeLegibility;\n  -webkit-font-smoothing: antialiased;\n  -moz-osx-font-smoothing: grayscale;\n}\n\na {\n  font-weight: 500;\n  color: #646cff;\n  text-decoration: inherit;\n}\na:hover {\n  color: #535bf2;\n}\n\nbody {\n  margin: 0;\n  display: flex;\n  place-items: center;\n  min-width: 320px;\n  min-height: 100vh;\n}\n\nh1 {\n  font-size: 3.2em;\n  line-height: 1.1;\n}\n\nbutton {\n  border-radius: 8px;\n  border: 1px solid transparent;\n  padding: 0.6em 1.2em;\n  font-size: 1em;\n  font-weight: 500;\n  font-family: inherit;\n  background-color: #1a1a1a;\n  cursor: pointer;\n  transition: border-color 0.25s;\n}\nbutton:hover {\n  border-color: #646cff;\n}\nbutton:focus,\nbutton:focus-visible {\n  outline: 4px auto -webkit-focus-ring-color;\n}\n\n@media (prefers-color-scheme: light) {\n  :root {\n    color: #213547;\n    background-color: #ffffff;\n  }\n  a:hover {\n    color: #747bff;\n  }\n  button {\n    background-color: #f9f9f9;\n  }\n}\n",
  "src/main.jsx":
    "import { StrictMode } from 'react'\nimport { createRoot } from 'react-dom/client'\nimport './index.css'\nimport App from './App.jsx'\n\ncreateRoot(document.getElementById('root')).render(\n  <StrictMode>\n    <App />\n  </StrictMode>,\n)\n",
  "vite.config.js":
    "import { defineConfig } from 'vite'\nimport react from '@vitejs/plugin-react'\n\n// https://vite.dev/config/\nexport default defineConfig({\n  plugins: [react()],\n})\n",
};

/**
 * Writes files from a dictionary to the sandbox in a specified directory
 * @param {Object} sandbox - The sandbox instance
 * @param {Object} filesDict - Dictionary of file paths and their contents
 * @param {string} targetDir - Target directory in the sandbox (e.g., "app1")
 * @returns {Promise<{filesCreated: number, errors: Array}>}
 */
async function writeFilesToSandbox(sandbox, filesDict, targetDir) {
  let filesCreated = 0;
  const errors = [];

  console.log(`Writing files to ${targetDir} directory in sandbox...`);

  // Create the target directory
  await sandbox.exec(`mkdir -p ${targetDir}`);

  // Iterate through each file in the dictionary
  for (const [relativePath, content] of Object.entries(filesDict)) {
    try {
      const fullPath = `${targetDir}/${relativePath}`;

      // Extract directory path (everything before the last /)
      const lastSlashIndex = fullPath.lastIndexOf("/");
      if (lastSlashIndex > 0) {
        const dirPath = fullPath.substring(0, lastSlashIndex);
        // Create directory structure if needed
        await sandbox.exec(`mkdir -p "${dirPath}"`);
      }

      // Write the file using sandbox.writeFile
      await sandbox.writeFile(fullPath, content);
      filesCreated++;
      console.log(`✓ Created: ${fullPath}`);
    } catch (err) {
      const errorMsg = `Error creating ${relativePath}: ${err.message}`;
      console.error(`✘ ${errorMsg}`);
      errors.push(errorMsg);
    }
  }

  console.log(
    `Completed: ${filesCreated} files created, ${errors.length} errors`
  );
  return { filesCreated, errors };
}

function getAppIdFromHost(host) {
  const first = (host || "").split(".")[0];
  const m = first && first.match(/^([a-z0-9-]+)-preview$/i);
  return m ? m[1] : null;
}

function getBaseDomain(host) {
  // Remove the "appId-preview." prefix to get the base domain
  // e.g., "app1-preview.localhost" -> "localhost"
  const parts = (host || "").split(".");
  return parts.length > 1 ? parts.slice(1).join(".") : host;
}

const HOST_NAME = "example.com";

export default {
  async fetch(request, env) {
    // Always proxy requests to sandbox first
    const proxyResponse = await proxyToSandbox(request, env);
    if (proxyResponse) {
      return proxyResponse;
    }

    // Get or create a sandbox instance
    const url = new URL(request.url);
    const appId = getAppIdFromHost(url.hostname);
    if (!appId)
      return new Response("Expected {appId}-preview.{domain}", { status: 400 });

    const baseDomain = getBaseDomain(url.hostname);

    try {
      // Wrap all sandbox operations with a 3-minute timeout
      const result = await withTimeout(
        (async () => {
          const sandbox = getSandbox(env.Sandbox, appId, {
            baseUrl: baseDomain,
          });

          const exposedPortsList = await sandbox.getExposedPorts(HOST_NAME);
          let exposedPortData = exposedPortsList.find((p) => p.port === 5000);

          console.info("Current exposed port 5000 data:", exposedPortData);

          if (exposedPortData) {
            console.info("UNEXPOSING PORT 5000");
            await sandbox.unexposePort(5000);
          }

          // Write app1 files to the sandbox
          const writeResult = await writeFilesToSandbox(
            sandbox,
            app1Files,
            "app1"
          );

          const list = await sandbox.listProcesses();

          const isRunning = list.find(
            (proc) =>
              proc.command.includes("npm run dev") && proc.status === "running"
          );

          if (isRunning) {
            console.info(`Process already running with ID: ${isRunning.id}`);
          } else {
            const installOp = await sandbox.startProcess(
              "cd app1 && npm install && npm run dev -- --port 5000"
            );

            console.info("Started npm install, process ID:", installOp.id);
            const logStream = await sandbox.streamProcessLogs(installOp.id);

            // Parse SSE stream to get structured objects
            for await (const log of parseSSEStream(logStream)) {
              console.log("Log object:", log);

              // Break on specific condition if needed
              if (log.data?.includes("ready in")) break;
            }

            console.info("npm install completed");

            // Now get the logs after process has completed
            const processLogs = await sandbox.getProcessLogs(installOp.id);
            console.info("npm install stdout:", processLogs.stdout);
            console.info("npm install stderr:", processLogs.stderr);
          }

          let isPortExposed = await sandbox.exposePort(5000, {
            hostname: HOST_NAME,
          });

          return {
            success: true,
            message: "Files written to sandbox",
            filesCreated: writeResult.filesCreated,
            errors: writeResult.errors,
            appId,
            url: isPortExposed.url,
          };
        })(),
        REQUEST_TIMEOUT_MS,
        "Request timed out after 3 minutes"
      );

      return new Response(JSON.stringify(result), {
        headers: { "Content-Type": "application/json" },
      });
    } catch (error) {
      // Handle timeout error
      if (error.message.includes("timed out")) {
        return new Response(
          JSON.stringify({
            success: false,
            error: "Request timed out after 3 minutes",
            errorType: "timeout",
            appId,
          }),
          {
            status: 408,
            headers: { "Content-Type": "application/json" },
          }
        );
      }

      console.error("Error handling request:", error);

      // Other errors
      return new Response(
        JSON.stringify({
          success: false,
          error: error.message,
          appId,
        }),
        {
          status: 500,
          headers: { "Content-Type": "application/json" },
        }
      );
    }
  },
};

export { Sandbox } from "@cloudflare/sandbox";

wrangler.jsonc

{
  "$schema": "./node_modules/wrangler/config-schema.json",
  "name": "sandbox-poc",
  "main": "src/index.js",
  "compatibility_date": "2024-04-03",
  "compatibility_flags": ["nodejs_compat"],
  "containers": [
    {
      "class_name": "Sandbox",
      "image": "./Dockerfile",
      "instance_type": "lite",
      "max_instances": 2
    }
  ],
  "durable_objects": {
    "bindings": [{ "class_name": "Sandbox", "name": "Sandbox" }]
  },
  "migrations": [
    {
      "tag": "v1",
      "new_sqlite_classes": ["Sandbox"]
    }
  ],
  "observability": {
    "enabled": false,
    "head_sampling_rate": 1,
    "logs": {
      "enabled": true,
      "head_sampling_rate": 1,
      "persist": true,
      "invocation_logs": true
    },
    "traces": {
      "enabled": false,
      "persist": true,
      "head_sampling_rate": 1
    }
  }
}

Could some one help where is the issue?

[whoiskatrin]

@rakeshar3796 is this on the latest version?

[deathbyknowledge]

Hey @rakeshar3796, would you mind re-trying with this preview version:

npm i https://pkg.pr.new/cloudflare/sandbox-sdk/@cloudflare/sandbox@254

Let me know if it changes the output at all

[rakeshar3796]

@whoiskatrin am running on version 0.5.1

"@cloudflare/sandbox": "0.5.1"

@deathbyknowledge i tried with your preview version as well, its still the same.

attaching few more debugs here,

Local Dev server output on hitting curl -H "Host: app1-preview.example.com" http://localhost:8787

Error checking if container is ready: connect(): Connection refused: container port not found. Make sure you exposed the port in your container definition.
Error checking if container is ready: The operation was aborted
Port 3000 is ready
{"level":"info","msg":"Exposed ports retrieved completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"0 ports exposed","timestamp":"2025-11-26T17:45:12.735Z"}
Current exposed port 5000 data: undefined
Writing files to app1 directory in sandbox...
{"level":"info","msg":"Version retrieved completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"0.5.1","timestamp":"2025-11-26T17:45:12.739Z"}
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p app1, Success: true","timestamp":"2025-11-26T17:45:12.860Z"}
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1\", Success: true","timestamp":"2025-11-26T17:45:12.933Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/.gitignore (253 chars)","timestamp":"2025-11-26T17:45:13.038Z"}
✓ Created: app1/.gitignore
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1\", Success: true","timestamp":"2025-11-26T17:45:13.102Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/README.md (1157 chars)","timestamp":"2025-11-26T17:45:13.169Z"}
✓ Created: app1/README.md
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1\", Success: true","timestamp":"2025-11-26T17:45:13.239Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/eslint.config.js (758 chars)","timestamp":"2025-11-26T17:45:13.305Z"}
✓ Created: app1/eslint.config.js
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1\", Success: true","timestamp":"2025-11-26T17:45:13.372Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/generate-files-json.js (2248 chars)","timestamp":"2025-11-26T17:45:13.442Z"}
✓ Created: app1/generate-files-json.js
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1\", Success: true","timestamp":"2025-11-26T17:45:13.509Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/index.html (360 chars)","timestamp":"2025-11-26T17:45:13.579Z"}
✓ Created: app1/index.html
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1\", Success: true","timestamp":"2025-11-26T17:45:13.645Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/package.json (607 chars)","timestamp":"2025-11-26T17:45:13.710Z"}
✓ Created: app1/package.json
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1/public\", Success: true","timestamp":"2025-11-26T17:45:13.781Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/public/vite.svg (1497 chars)","timestamp":"2025-11-26T17:45:13.851Z"}
✓ Created: app1/public/vite.svg
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1/src\", Success: true","timestamp":"2025-11-26T17:45:13.920Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/src/App.css (606 chars)","timestamp":"2025-11-26T17:45:13.987Z"}
✓ Created: app1/src/App.css
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1/src\", Success: true","timestamp":"2025-11-26T17:45:14.050Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/src/App.jsx (903 chars)","timestamp":"2025-11-26T17:45:14.122Z"}
✓ Created: app1/src/App.jsx
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1/src/assets\", Success: true","timestamp":"2025-11-26T17:45:14.189Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/src/assets/react.svg (4126 chars)","timestamp":"2025-11-26T17:45:14.258Z"}
✓ Created: app1/src/assets/react.svg
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1/src\", Success: true","timestamp":"2025-11-26T17:45:14.325Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/src/index.css (1154 chars)","timestamp":"2025-11-26T17:45:14.392Z"}
✓ Created: app1/src/index.css
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1/src\", Success: true","timestamp":"2025-11-26T17:45:14.459Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/src/main.jsx (229 chars)","timestamp":"2025-11-26T17:45:14.525Z"}
✓ Created: app1/src/main.jsx
{"level":"info","msg":"Command executed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"mkdir -p \"app1\", Success: true","timestamp":"2025-11-26T17:45:14.591Z"}
{"level":"info","msg":"File written completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"app1/vite.config.js (161 chars)","timestamp":"2025-11-26T17:45:14.656Z"}
✓ Created: app1/vite.config.js
Completed: 13 files created, 0 errors
{"level":"info","msg":"Processes listed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"0 processes","timestamp":"2025-11-26T17:45:14.682Z"}
{"level":"info","msg":"Process started completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"cd app1 && npm install && npm run dev -- --port 5000 (ID: proc_1764179114688_62lz4e)","timestamp":"2025-11-26T17:45:14.692Z"}
Started npm install, process ID: proc_1764179114688_62lz4e
{"level":"info","msg":"Process log stream started completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"ID: proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:14.706Z"}
Log object: {"type":"process_info","processId":"proc_1764179114688_62lz4e","command":"cd app1 && npm install && npm run dev -- --port 5000","status":"running","timestamp":"2025-11-26T17:45:14.700Z"}
Log object: {"type":"stdout","data":"\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:27.610Z"}
Log object: {"type":"stdout","data":"added 156 packages, and audited 157 packages in 12s\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:27.611Z"}
Log object: {"type":"stdout","data":"\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:27.611Z"}
Log object: {"type":"stdout","data":"33 packages are looking for funding\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:27.612Z"}
Log object: {"type":"stdout","data":"  run `npm fund` for details\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:27.612Z"}
Log object: {"type":"stdout","data":"\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:27.612Z"}
Log object: {"type":"stdout","data":"found 0 vulnerabilities\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:27.612Z"}
Log object: {"type":"stdout","data":"\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:28.021Z"}
Log object: {"type":"stdout","data":"> sandbox-sdk@0.0.0 dev\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:28.022Z"}
Log object: {"type":"stdout","data":"> vite --port 5000\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:28.022Z"}
Log object: {"type":"stdout","data":"\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:28.022Z"}
Log object: {"type":"stdout","data":"\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:28.831Z"}
Log object: {"type":"stdout","data":"  VITE v7.2.4  ready in 489 ms\n","processId":"proc_1764179114688_62lz4e","timestamp":"2025-11-26T17:45:28.831Z"}
npm install completed
{"level":"info","msg":"Process logs retrieved completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"ID: proc_1764179114688_62lz4e, stdout: 294 chars, stderr: 0 chars","timestamp":"2025-11-26T17:45:28.842Z"}
npm install stdout: 
added 156 packages, and audited 157 packages in 12s

33 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities

> sandbox-sdk@0.0.0 dev
> vite --port 5000


  VITE v7.2.4  ready in 489 ms

  ➜  Local:   http://localhost:5000/
  ➜  Network: use --host to expose

npm install stderr: 
{"level":"info","msg":"Port exposed completed successfully","component":"sandbox-do","sandboxId":"e332646e2b40a313937c6ba9c471b66bf8a6e7f1c3ee1ae46aaef9ccee500abf","traceId":"tr_ec5419325fe04060","details":"5000 exposed at http://localhost:5000","timestamp":"2025-11-26T17:45:28.850Z"}
[wrangler:info] GET / 200 OK (23227ms)

resulting in output of

{"success":true,"message":"Files written to sandbox","filesCreated":13,"errors":[],"appId":"app1","url":"https://5000-app1-hfs8uerbncrlvgcm.example.com/"}

in local am observing after this log output

Log object: {"type":"process_info","processId":"proc_1764179114688_62lz4e","command":"cd app1 && npm install && npm run dev -- --port 5000","status":"running","timestamp":"2025-11-26T17:45:14.700Z"}

basically when the start process info command, am seeing next output log in almost after ~10s, believing that's due to process start

unfortunately after deploying, even after say a minute the request isn't getting fulfilled nor i see logs in the observability page

[rakeshar3796]

@deathbyknowledge @whoiskatrin any thoughts on the above?

[whoiskatrin]

@rakeshar3796 would mind trying with the latest? it's 0.5.6, also make sure use clean up all the node_modules etc and try again