如何创建异步方法的同步版本？

Question

I'm trying to achieve something similar to the methods you get with the core fs module where you have an Async method by default and a Sync method if requested such as fs.readDir() and fs.readDirSync() ;

I have a method called fetchUrls that fetches files from a list of urls and returns a promise. I want to add another method called fetchUrlsSync which calls fetchUrls and blocks the thread until the promise is resolved. how can that be done?

sample code:

fetchUrls(startDate, endDate) {
    return new Promise((resolve, reject)=> {
        // some async work...
    })
}

fetchUrlsSync() {
 // call fetchUrls and block until resolved
}

those two functions are methods on a class.

Answer 1

This isn't possible directly in node.js. It also goes against the general model in node, which is to perform all IO asynchronously.

It is however possible to use a compiled Node.js extension to achieve this called http-sync .