将任务运行器中返回的值存储为字段以供以后访问

const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const { v4: uuidv4 } = require('uuid');

app.use(bodyParser.json());

// 模拟异步任务
function asyncTask(value) {
  return new Promise((resolve) => {
    setTimeout(() => {
      resolve(`Processed ${value}`);
    }, 2000);
  });
}

// 存储任务结果的简单内存数据库
const taskResults = {};

app.post('/run-task', async (req, res) => {
  const taskId = uuidv4();
  const value = req.body.value;

  try {
    const result = await asyncTask(value);
    taskResults[taskId] = result; // 存储结果
    res.status(202).json({ taskId });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

app.get('/task-result/:taskId', (req, res) => {
  const { taskId } = req.params;
  const result = taskResults[taskId];
  if (result) {
    res.json({ result });
  } else {
    res.status(404).json({ error: 'Task not found' });
  }
});

app.listen(3000, () => {
  console.log('Server running on port 3000');
});