[feat] parallel resolution

[Kikobeats]

Describe the feature

I recently installed AdGuard Home on my local network and enabled the following feature:

It's great because you no longer have to worry about whether your DNS is fast or not – simply the fastest will be used.

I was wondering if Tangerine can implement this way of DNS resolution.

Checking the Tangerine source code, I can see requests are resolved in series, so the server index in the array is important:

nodejs-dns-over-https-tangerine/index.js

Line 1112 in 42da3ee

for (const server of servers) {

This parallel resolution could be achievable using p-any; it also supports cancellation, so as soon as the first promise for getting the DNS resolution is resolved, the rest will be cancelled, preventing a waste of resources.

WDYT?

[titanism]

This sounds great, could you add this as a PR with a configurable option series or parallel or something? Or maybe just parallel: true is the default. @Kikobeats

[Kikobeats]

That sounds good – we can keep "series" by default to mimic the current behavior.

I have to find the time for writing this, so let's keep this issue open 🙂