NodeJS请求多个api端点 [英] NodeJS request multiple api endpoints

问题描述

好的，所以我试图使用请求模块向API端点发出两个或更多的请求。我正在渲染一个HTML文件，并使用以下代码将返回的JSON传递给一个句柄模板：

Ok so I am trying to make two or more requests to API endpoints using the request module. I am rendering a HTML file and passing the returned JSON to a handlebars template using the below code:

res.render('list.html', {
  title: 'List',
  data: returnedJSON
}

我可以很容易地在我的手柄模板中迭代这个JSON。

I can then iterate over this JSON within my handlebars template fairly easily.

我遇到的问题是我现在需要使用多个数据来源的类别列表将从类JSON应用程序和员工JSON响应中的员工列表构建。我想要一个简单的解决方案，我可以做到这一点，但扩展它使用任何数量的数据源。

The problem I have, is that I am now needing to use multiple data sources where a category list will be built from a categories JSON response and a Staff list from a staff JSON response. I would like a simple solution where I can do this, but expand it to use any number of data sources.

以下是一个完整的代码片段，其中包含一个数据源：

Below is a full code snippet of what I have with one data source:

request({
    url: 'https://api.com/categories',
    headers: {
        'Bearer': 'sampleapitoken'
    }
}, function(error, response, body) {
    if(error || response.statusCode !== 200) {
        // handle error
    } else {
        var json = JSON.parse(body);
        res.render('list.html', {
            title: 'Listing',
            data: json
        });
    }
});

这对一个端点非常有用，但如前所述，我现在需要使用多个请求并具有多个数据来源例如：

This works great for one endpoint, but as mentioned before I now need to use multiple requests and have multiple data sources for example:

request({
    url: ['https://api.com/categories','https://api.com/staff'],
    headers: {
        'Bearer': 'sampleapitoken'
    }
}, function(error, response, body1, body2) {
    if(error || response.statusCode !== 200) {
        // handle error
    } else {
        var json1 = JSON.parse(body1);
        var json2 = JSON.parse(body2);
        res.render('list.html', {
            title: 'Listing',
            staff: json1,
            categories: json2
        });
    }
});

我感谢以上不行，但我希望这可以帮助我传达尝试实现。

I appreciate the above doesn't work like that, but I hope this can help convey what I am trying to achieve.

提前感谢：）

推荐答案

你可以使用异步库映射您的请求对象并将其传递给实际请求，并将所有结果返回一个回调。

You can use the async library to map your request objects and pass them to an actual request and return all results in one callback.

var async = require("async");
var request = require("request");

// create request objects
var requests = [{
  url: 'https://api.com/categories',
  headers: {
    'Bearer': 'sampleapitoken'
  }
}, {
  url: 'https://api.com/staff',
  headers: {
    'Bearer': 'sampleapitoken'
  }
}];

async.map(requests, function(obj, callback) {
  // iterator function
  request(obj, function(error, response, body) {
    if (!error && response.statusCode == 200) {
      // transform data here or pass it on
      var body = JSON.parse(body);
      callback(null, body);
    } else {
      callback(error || response.statusCode);
    }
  });
}, function(err, results) {
  // all requests have been made
  if (err) {
    // handle your error
  } else {
    console.log(results);
    for (var i = 0; i < results.length; i++) {
      // request body is results[i]
    }
  }
});

---

然而，一种更简单的方法就是利用承诺，可以用bluebird和promisify请求lib来完成，或使用已经承诺的请求lib 请求承诺 。您仍然希望包含承诺/ A + lib以异步映射结果。

---

However a simpler way would to leverage promises, this can be done with bluebird and promisifying the request lib, or use the already promisified request lib request-promise. You'll still want to include a promise/A+ lib to map the results asynchronously.

var Promise = require("bluebird");
var request = require('request-promise');

// create request objects
var requests = [{
  url: 'https://api.com/categories',
  headers: {
    'Bearer': 'sampleapitoken'
  }
}, {
  url: 'https://api.com/staff',
  headers: {
    'Bearer': 'sampleapitoken'
  }
}];

Promise.map(requests, function(obj) {
  return request(obj).then(function(body) {
    return JSON.parse(body);
  });
}).then(function(results) {
  console.log(results);
  for (var i = 0; i < results.length; i++) {
    // access the result's body via results[i]
  }
}, function(err) {
  // handle all your errors here
});

---

重要的是要注意所有最新版本的节点浏览器支持Promise开箱即用，无需外部库即可实现。

---

It's important to note that all latest versions of node and browsers support Promises out of the box and this can be implemented without external libraries.

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