正确使用 Meteor.wrapAsync

Question

希望这是一个新手问题。我有以下代码，我正在尝试使用 meteor.wrapAsync 将其转换为。我收到 "Exception while invoking method 'emailSend' ReferenceError: syncfunc is not defined" 异常。我错过了什么？

堆栈跟踪：

I20191031-06:21:16.246(-5)? Exception while invoking method 'emailSend' ReferenceError: syncfunc is not defined
I20191031-06:21:16.248(-5)?     at MethodInvocation.emailSend (src/imports/api/email.js:13:27)
I20191031-06:21:16.249(-5)?     at maybeAuditArgumentChecks (packages/ddp-server/livedata_server.js:1771:12)
I20191031-06:21:16.273(-5)?     at DDP._CurrentMethodInvocation.withValue (packages/ddp-server/livedata_server.js:719:19)  
I20191031-06:21:16.275(-5)?     at Meteor.EnvironmentVariable.EVp.withValue (packages\meteor.js:1234:12)
I20191031-06:21:16.276(-5)?     at DDPServer._CurrentWriteFence.withValue (packages/ddp-server/livedata_server.js:717:46)  
I20191031-06:21:16.277(-5)?     at Meteor.EnvironmentVariable.EVp.withValue (packages\meteor.js:1234:12)
I20191031-06:21:16.277(-5)?     at Promise (packages/ddp-server/livedata_server.js:715:46)
I20191031-06:21:16.278(-5)?     at new Promise (<anonymous>)
I20191031-06:21:16.279(-5)?     at Session.method (packages/ddp-server/livedata_server.js:689:23)
I20191031-06:21:16.280(-5)?     at packages/ddp-server/livedata_server.js:559:43

email.js:

Meteor.methods(
{
  emailSend(fromAddress, subject, emailText) 
  {
    if (Meteor.isServer) 
    {     
      const { Email } = require('../server/email.js');
      var syncFunc = Meteor.wrapAsync(Email.send); 
      var sendEmailReturn=syncfunc(fromAddress, subject, emailText);      
      return sendEmailReturn;
      **//if I comment out the above three lines and uncomment the line below then the application works fine.** 
      //return Email.send(fromAddress, subject, emailText);      
    }
  },  
})

Answer 1

我相信 Meteor.defer 更适合您在这里想要实现的目标。

示例：

Meteor.methods({
    'action_plus_email': function () {
        // do something

        Meteor.defer(() => {
            Email.send(...)
        })

        return 'hello there, user';
    }
})

https://www.meteor-tuts.com/chapters/1/meteorsnacks#Meteor-defer

https://apiko.com/blog/organization-of-email-sending-in-meteorjs/

如果您要发送很多电子邮件，请查看邮寄时间。它可以提供很大的帮助。

https://github.com/VeliovGroup/Mail-Time

Answer 2

您不需要使用外部回调来同步方法，因为 Meteor 默认支持 "async" 和 "awaits"。下面是使用 'await' 方法的示例。

Meteor.methods({
    async emailSend(fromAddress, subject, emailText) {
        const { Email } = require('../server/email.js');
        var sendEmailReturn = await Email.send(fromAddress, subject, emailText);
    }
});

正确使用 Meteor.wrapAsync

Using Meteor.wrapAsync correctly

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