Youtube Api，如何使用 nextPageToken 解析所有视频? [英] Youtube Api, how to parse all vids with a nextPageToken?

问题描述

我正在使用 Node.JS 和请求"库 https://github.com/request/请求我阅读了文档，因为我只能从频道请求 50 个视频，作为来自 api 服务器的响应，有一个 nextPageToken 键，但我不明白如何使这个 nextPageToken 的请求链通过整个链条.

I'm using Node.JS, and the "request" library https://github.com/request/request I read the documentation, as much as I can request only 50 videos from the channel, in response from the api server, there is a nextPageToken key, but I do not understand how to make the chain of requests for this nextPageToken to go through the whole chain.

`https://www.googleapis.com/youtube/v3/search?key=${key}&channelId=${channelId}&part=snippet,id&order=date&maxResults=50`;

我草拟了这段代码

request({url:url}, function(err, response, body){
    let data = JSON.parse(body);
    for(let i = 0; i < Math.fround(data.pageInfo.totalResults / maxResults); i++){
        let newUrl = url + '&pageToken=' + data.nextPageToken;
        request({url: newUrl}, function(err, response, body){
            newUrl = url + '&pageToken=' + JSON.parse(body).nextPageToken;
            console.log(JSON.parse(body).nextPageToken);
        })
    }
})

在+450视频频道，没有想到最好的解决方案，取第一个请求的结果，除以请求视频的最大数量，我得到9-10，然后结果每个周期10遍，理论上每个请求都应该更新变量 newUrl 之后，再次访问服务器以获取新数据和新的 nextPageToken.

At channel +450 video, did not think of the best solution and take the result of the first request, and divide by the maximum number of requested video, I get 9-10, then it turns out 10 passes per cycle, and in theory each request should update the variable newUrl And after, again access to the server for new data, and a new nextPageToken.

怎么样?

推荐答案

通常在处理 API 时使用 for 循环是不公平的，您可能希望更慢地单步执行您的请求.我下面的示例使用简单的递归，但您甚至可能希望在函数调用自身时添加超时.

Typically when dealing with API's its not fair to use a for loop, you may want to step through your requests slower. My below example uses simple recursion but you may want to even add a timeout when the function calls itself.

let url = 'formatted url'
let videos = [];

function worker = (token, url) {
  
  //use the standard url if there is no token
  if (!token) {
    request({url:url}, function(err, response, body){
      let data = JSON.parse(body);
      //do something with data
      
      //if there is a next page token run worker again.
      if (data.nextPageToken) {
        let token = data.nexPageToken;
        
        return worker(token, url);
      } else {
        console.log('fin');
      }
      
   } else {
     //if there is a token use a new url
     let nurl = 'url + page token';
     
     request({url: url}, function(err, response, body) {
      
      let data = JSON.parse(body);
      //do something with data
      
      //if there is a token run the worker again
      
      if (data.nextPageToken) {
        let token = data.nextPageToken;
        return worker(token, url);
      } else {
        console.log('fin');
      }
      
     })
     
   }
}

worker(null, url);

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