如何从多个节点请求主体中获取数据并传递到 EJS 文件中

Question

I am creating a website which uses an api to dispaly football (soccer) scores, fixtures etc. I have tried to create a global variable to save the request data to and then pass into ejs however this doesn't seem to work.

router.get('/stats', (req, res) => {


request(options, function (error, response, body) {
    if (error) throw new Error(error);

  top_scorer_data = JSON.parse(body)

});


request(options2, function (error, response, body) {
    if (error) throw new Error(error);

  top_assists_data = JSON.parse(body)

});


request(options3, function (error, response, body) {
    if (error) throw new Error(error);

  top_red_cards_data = JSON.parse(body)  

});


request(options4, function (error, response, body) {
    if (error) throw new Error(error);

  top_yellow_cards_data = JSON.parse(body)

});

res.render('bundesliga/stats', {})

})

Answer 1

You should follow DRY principle and move request to a service or a helper function. You shouldn't use global variables, use promises instead, and wait for all requests to finish.

So, you should promisify request method (you should really migrate to axios or node-fetch , because request is deprecated)

and then use Promise.all to make all the requests with each option, and then gather results into variables, which you then pass to the .render method.

Try this:

router.get('/stats', async(req, res) => {

    function getData(options) {
        return new Promise((resolve, reject) => {
            request(options, function(error, response, body) {
                if (error) reject(error);
                resolve(JSON.parse(body));
            });
        });
    }



    const [top_scorer_data, top_assists_data, top_red_cards_data, top_yellow_cards_data] = await Promise.all([
        getData(options),
        getData(options2),
        getData(options3),
        getData(options4)
    ]).catch(err => {
        console.log('err', err);
    });

    res.render('bundesliga/stats', {
        top_scorer_data,
        top_assists_data,
        top_red_cards_data,
        top_yellow_cards_data
    });

});