javascript - Firebase 云功能在发送电子邮件之前结束

Question

显然下面的代码工作正常，但是触发器函数的执行在电子邮件发送之前很久就结束了。 不知道会不会导致错误。

延迟结束直至电子邮件发送的正确方法是什么？

const mailTransport = nodemailer.createTransport({
    service: "gmail",
    auth: {
        user: "email",
        pass: "pass"
      }
});

exports.createEnrollment = functions.firestore
    .document("enrollments/{enrollmentId}")
    .onCreate(event => {

        var newValue = event.data.data();

        // ... other commands to retrieve email content and recipient

         mailTransport
          .sendMail(content)
          .then(() => {
            console.log(`New email sent to ${email}`);
          })
          .catch(function(error) {
            console.error("Error writing document: ", error);
          });

     console.log("ending function");
     return event.data.data();

});

Answer 1

在你的 promise 兑现之前你就要回来了。

const mailTransport = nodemailer.createTransport({
  service: "gmail",
  auth: {
    user: "email",
    pass: "pass"
  }
});

exports.createEnrollment = functions.firestore
  .document("enrollments/{enrollmentId}")
  .onCreate(event => {

    var newValue = event.data.data();    

    // ... other commands to retrieve email content and recipient

    return mailTransport
      .sendMail(content)
      .then(() => {
        console.log(`New email sent to ${email}`);
      })
      .catch(function (error) {
        console.error("Error writing document: ", error);
      });
    console.log("ending function");
  });

mailtransport.sendMail 是一个应该返回的 promise 。

但是现在你将永远不会在日志中看到结束函数..如果你愿意的话。将其移至您的 .then 函数中，或链接另一个函数。