为什么我的Meteor API调用会抛出异常？

时间：2015-10-24 14:44:33

标签： javascript json meteor http-get http-error

我有以下代码（基于“Meteor In Action”的第242和243页）来尝试调用外部API：

流星法：

Meteor.methods({
  . . .
  'getTextAddrAsEmailAddr': function(phone) {
    this.unblock;
    var apiUrl = 'http://www.xminder.com/number.check.php?number=' + phone;
    var response = Meteor.wrapAsync(apiCall) (apiUrl);
    return response;
  }
});

“专用功能”：

var apiCall = function (apiUrl, callback) {
  try {
    var response = HTTP.get(apiUrl).data;
    callback(null, response);
  } catch (error) {
    if (error.response) {
      var errorCode = error.response.data.code;
      var errorMessage = error.response.data.message;
    } else {
      var errorCode = 500;
      var errorMessage = 'Cannot access the API';
    }
    var myError = new Meteor.Error(errorCode, errorMessage);
    callback(myError, null);
  }
}

我是如何称呼它的（一个Meteor方法调用另一个）：

Meteor.methods({
  'insertPerson': function(firstname, lastname, streetaddr1, streetaddr2, placename, stateorprov, zipcode, emailaddr, phone, notes) {
    console.log('insertPerson reached'); // TODO: Remove before deploying
    check(firstname, String);
    . . .
    console.log('phone is ' + phone);
    var textAddrAsEmailAddr = Meteor.call("getTextAddrAsEmailAddr", phone, function(error, result) {
      console.log("textAddrAsEmailAddr is " + textAddrAsEmailAddr);
      console.log(result);
    })
    console.log('textAddrAsEmailAddr is ' + textAddrAsEmailAddr);
    . . .

（Chrome）浏览器控制台输出：

reached addPerson.submit form
methods.js:29 insertPerson reached
methods.js:41 phone is 2624908739
debug.js:41 Exception in callback of async function Error: Cannot access the API [500]
    at apiCall (http://localhost:3000/app/both/methods.js?55690625ac0aa28550112db1c63d2b8912cc3410:30:19)
    at http://localhost:3000/packages/meteor.js?9730f4ff059088b3f7f14c0672d155218a1802d4:195:23
    at Meteor.methods.getTextAddrAsEmailAddr (http://localhost:3000/app/both/methods.js?55690625ac0aa28550112db1c63d2b8912cc3410:82:45)
    at http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:3911:25
    at _.extend.withValue (http://localhost:3000/packages/meteor.js?9730f4ff059088b3f7f14c0672d155218a1802d4:971:17)
    at _.extend.apply (http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:3902:54)
    at _.extend.call (http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:3780:17)
    at Meteor.methods.insertPerson (http://localhost:3000/app/both/methods.js?55690625ac0aa28550112db1c63d2b8912cc3410:52:38)
    at http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:3911:25
    at _.extend.withValue (http://localhost:3000/packages/meteor.js?9730f4ff059088b3f7f14c0672d155218a1802d4:971:17)
methods.js:50 textAddrAsEmailAddr is undefined
methods.js:51 undefined
methods.js:53 textAddrAsEmailAddr is undefined

命令提示符输出：

I20151024-07:23:43.999(-7)? insertPerson reached
I20151024-07:23:44.021(-7)? phone is 2624908739
I20151024-07:23:44.641(-7)? textAddrAsEmailAddr is undefined
I20151024-07:23:44.649(-7)? null
I20151024-07:23:44.649(-7)? textAddrAsEmailAddr is undefined

结果是，我的专用功能的捕获块被击中了。为什么？我可以直接在浏览器中输入ApiUrl（ http://www.xminder.com/number.check.php?number=2624908739 ）并获得以下结果：

{"success":true,"data":{"number":"2624908739","status":"YES","carrier_name":"ATT Mobility","carrier_id":"","sms_address":"2624908739@txt.att.net","mms_address":"2624908739@mms.att.net"}}

我想要 sms_address 值，具体而言;为什么我尝试访问此响应失败？

更新

我将代码更改为：

var apiCall = function (apiUrl, callback) {
  try {
    var response = HTTP.get(apiUrl).data;
    callback(null, response);
  }
  // catch (error) {
  //   if (error.response) {
  //     var errorCode = error.response.data.code;
  //     var errorMessage = error.response.data.message;
  //   }
  //   else {
  //     // var errorCode = 500;
  //     var errorCode = error.response.code;
  //     // var errorMessage = 'Cannot access the API';
  //     var errorMessage = error.response.message;
  //   }
  //   var myError = new Meteor.Error(errorCode, errorMessage);
  //   callback(myError, null);
  // }
  catch (error) { console.log(error) };
}

...并在命令提示符控制台中获取相同的内容：

I20151024-08:14:57.413(-7)? insertPerson reached
I20151024-08:14:57.434(-7)? phone is 2624908741
I20151024-08:14:58.248(-7)? textAddrAsEmailAddr is undefined
I20151024-08:14:58.255(-7)? null
I20151024-08:14:58.264(-7)? textAddrAsEmailAddr is undefined

...这在浏览器控制台中：

reached addPerson.submit form
methods.js:25 insertPerson reached
methods.js:37 phone is 2624908741
methods.js:20 Error: Can't make a blocking HTTP call from the client; callback required.(…)
methods.js:46 textAddrAsEmailAddr is undefined
methods.js:47 undefined
methods.js:49 textAddrAsEmailAddr is undefined

注意：将catch块更改为：

时，我也会这样做 
catch (error) {
  console.log(error)
  callback(error, null);
};

更新2

无论如何，尝试使用此特定API可能是一个失败的原因，因为在浏览器中测试了一个伪造的电话号码：

{"success":false,"error":"Too many requests during last 24h"}

更新3

我将Meteor方法从\ both \文件夹移动到\ server \文件夹，但显然无济于事。我只在浏览器控制台中得到这个：

reached addPerson.submit form

...并在命令提示符控制台中显示（仍然/再次）：

I20151024-13:02:23.539(-7)? insertPerson reached
I20151024-13:02:23.563(-7)? phone is 2624908743
I20151024-13:02:24.399(-7)? textAddrAsEmailAddr is undefined
I20151024-13:02:24.409(-7)? null
I20151024-13:02:24.410(-7)? textAddrAsEmailAddr is undefined

...但是Jeroen Peeter的代码与我的代码不同，我不知道如何将它合并到我现有的代码中;他说：

HTTP.get(apiUrl, function (error, data){
    console.log( 'http.get ::', error, data);
});

......我有：

var apiCall = function (apiUrl, callback) {
  try {
    var response = HTTP.get(apiUrl).data;
    callback(null, response);
  }
  catch (error) {
    if (error.response) {
      var errorCode = error.response.data.code;
      var errorMessage = error.response.data.message;
    }
    else {
      var errorCode = error.response.code;
      var errorMessage = error.response.message;
    }
    var myError = new Meteor.Error(errorCode, errorMessage);
    callback(myError, null);
  }

...那么他的代码在哪里适合我的（非工作）代码？

更新4

更改后：

var response = HTTP.get(apiUrl).data;

......对此：

var response = JSON.parse(HTTP.get(apiUrl).content;

...我在命令提示符控制台中获取：

=> Errors prevented startup:

   While processing files with ecmascript (for target os.windows.x86_32):
   server/methods.js:4:54: server/methods.js: Unexpected token (4:54)

=> Your application has errors. Waiting for file change.

第4行，char 54是“内容”中的最后一个“t”...... ???

2 个答案:

答案 0 :(得分：1)

似乎HTTP.get是从客户端而不是服务器运行的。在这种情况下，阻塞调用是不可能的，因此错误消息。您需要定义一个回调：

HTTP.get(apiUrl, function (error, data){
    console.log( 'http.get ::', error, data);
});

如果您不想在客户端上运行此操作（我认为您不想这样做），则需要确保在服务器上定义了您的方法。 将您定义Meteor.methods的文件放在server文件夹中，或用if (Meteor.isServer) { ... }包装所有Meteor.methods以确保方法仅在服务器上定义。

if (Meteor.isServer) { 
    Meteor.methods({
    . . .
    'getTextAddrAsEmailAddr': function(phone) {
        this.unblock;
        var apiUrl = 'http://www.xminder.com/number.check.php?number=' + phone;
        var response = Meteor.wrapAsync(apiCall) (apiUrl);
        return response;
    }
});

答案 1 :(得分：1)

使用Meteor.wrapAsync进行外部API调用的方式有问题。

这是我将如何做到的（在ecmascript2015中）

let wrappedGetTextAddrAsEmailAddr = Meteor.wrapAsync(function (phone, callback) {
  const apiUrl = `http://www.xminder.com/number.check.php?number=${phone}`;

  HTTP.get(apiUrl, callback);
});

Meteor.methods(
{
  // Call like: Meteor.call('insertPerson', {firstname: 'Bob', ...});
  insertPerson(personData) 
  {
    let textAddrAsEmailAddr;

    console.log('insertPerson reached'); // TODO: Remove before deploying
    check(personData, Object);
    check(personData.firstname, String);
    . . .
    console.log(`phone is ${phone}`);
    textAddrAsEmailAddr = wrappedGetTextAddrAsEmailAddr(personData.phone);
    console.log(`textAddrAsEmailAddr is ${textAddrAsEmailAddr}`);
    . . .
  }
});

确保将上面的所有代码放在服务器文件夹中，或者只用if (Meteor.isServer) { ... }

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