如何在异步/等待的无限while循环中捕获错误承诺？

Question

我已经遇到了在无限的while循环中捕获错误的问题。 因此，如果循环中出现一些错误，我希望我的代码以proccess.exit（-1）退出node.js。 所以这是代码：

while (true) {
    await promisifiedDelay(20000);
    users.map(async (client) => {
        //await client.login();
        const allRequests = await client.getFollowRequests();
        const requests = allRequests.slice(0, 100);
        const currentName = await client.getCurUsername(); 
    if (requests.length) {
    console.log(`${currentName}: `, requests);
    }
        requests.map(async (request) => {
            await promisifiedDelay(500);
            await client.approve({ userId: request.node.id });
        })
        await updateAdded(requests.length, currentName);
    });
}

您能否建议最好的方法来捕获循环中的所有错误？

Answer 1

您可以将块包装在try catch ：

while (true) {
  try {
    await promisifiedDelay(20000);
    users.map(async client => {
      //await client.login();
      const allRequests = await client.getFollowRequests();
      const requests = allRequests.slice(0, 100);
      const currentName = await client.getCurUsername();
      if (requests.length) {
        console.log(`${currentName}: `, requests);
      }
      requests.map(async request => {
        await promisifiedDelay(500);
        await client.approve({ userId: request.node.id });
      });
      await updateAdded(requests.length, currentName);
    });
  } catch (e) {
    console.log(e);
    break; // or process.exit(-1)
  }
}

Answer 2

使用此示例：

while (true) {
try {
    await promisifiedDelay(20000).catch(err => throw err);
    users.map(async (client) => {
        //await client.login();
        const allRequests = await client.getFollowRequests().catch(err => throw err);
        const requests = allRequests.slice(0, 100);
        const currentName = await client.getCurUsername().catch(err => throw err); 
    if (requests.length) {
    console.log(`${currentName}: `, requests);
    }
        requests.map(async (request) => {
            await promisifiedDelay(500).catch(err => throw err);
            await client.approve({ userId: request.node.id }).catch(err => throw err);
        })
        await updateAdded(requests.length, currentName);
    });
} catch(error) {
    console.log(error);
}

}