使用任务处理程序触发 Cloud Functions 函数

使用 Cloud Tasks 来触发 Cloud Functions 函数。

深入探索

如需查看包含此代码示例的详细文档，请参阅以下内容：

代码示例

Node.js

如需了解如何安装和使用 Cloud Tasks 客户端库，请参阅 Cloud Tasks 客户端库。 如需了解详情，请参阅 Cloud Tasks Node.js API 参考文档。

如需向 Cloud Tasks 进行身份验证，请设置应用默认凭据。 如需了解详情，请参阅为本地开发环境设置身份验证。 

const sendgrid = require('@sendgrid/mail');

/**
 * Responds to an HTTP request from Cloud Tasks and sends an email using data
 * from the request body.
 *
 * @param {object} req Cloud Function request context.
 * @param {object} req.body The request payload.
 * @param {string} req.body.to_email Email address of the recipient.
 * @param {string} req.body.to_name Name of the recipient.
 * @param {string} req.body.from_name Name of the sender.
 * @param {object} res Cloud Function response context.
 */
exports.sendEmail = async (req, res) => {
  // Get the SendGrid API key from the environment variable.
  const key = process.env.SENDGRID_API_KEY;
  if (!key) {
    const error = new Error(
      'SENDGRID_API_KEY was not provided as environment variable.'
    );
    error.code = 401;
    throw error;
  }
  sendgrid.setApiKey(key);

  // Get the body from the Cloud Task request.
  const {to_email, to_name, from_name} = req.body;
  if (!to_email) {
    const error = new Error('Email address not provided.');
    error.code = 400;
    throw error;
  } else if (!to_name) {
    const error = new Error('Recipient name not provided.');
    error.code = 400;
    throw error;
  } else if (!from_name) {
    const error = new Error('Sender name not provided.');
    error.code = 400;
    throw error;
  }

  // Construct the email request.
  const msg = {
    to: to_email,
    from: 'postcard@example.com',
    subject: 'A Postcard Just for You!',
    html: postcardHTML(to_name, from_name),
  };

  try {
    await sendgrid.send(msg);
    // Send OK to Cloud Task queue to delete task.
    res.status(200).send('Postcard Sent!');
  } catch (error) {
    // Any status code other than 2xx or 503 will trigger the task to retry.
    res.status(error.code).send(error.message);
  }
};

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例，请参阅Google Cloud 示例浏览器。