Question

29

How can I make this call to request in nodejs synchronous?

rated 0 times [ 31] [ 2] / answers: 1 / hits: 106941 / 12 Years ago, tue, march 27, 2012, 12:00:00

I have a function in my nodejs application called get_source_at. It takes a uri as an argument and its purpose is to return the source code from that uri. My problem is that I don't know how to make the function synchronously call request, rather than giving it that callback function. I want control flow to halt for the few seconds it takes to load the uri. How can I achieve this?

function get_source_at(uri){

    var source;

    request({ uri:uri}, function (error, response, body) {

        console.log(body);

    });

    return source;

}

Also, I've read about 'events' and how node is 'evented' and I should respect that in writing my code. I'm happy to do that, but I have to have a way to make sure I have the source code from a uri before continuing the control flow of my application - so if that's not by making the function synchronous, how can it be done?

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shantelc

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4 Years ago

answered 12 Years ago myrap · Accepted Answer

You should avoid synchronous requests. If you want something like synchronous control flow, you can use async.

async.waterfall([

    function(callback){

        data = get_source_at(uri);

        callback(null, data);

    },

    function(data,callback){

        process(data, callback);

    },

], function (err,result) {

    console.log(result)

});

The process is promised to be run after get_source_at returns.