How I Learned to Stop Worrying and Love the EventLoopFuture

Low-level framework SwiftNIO developed by Apple corporation is a foundation for all major server-side Swift frameworks — Vapor, Kitura, Smoke.

However, none of these instruments comprehensively clarify main concepts and principles of usage of the most important part of NIO — EventLoopPromise and EventLoopFuture, which leads to fundamental misunderstanding and confusion, and therefore questions like “How to get value from Future?” are asked in all kinds of forums and chats.

This is what we're gonna talk about today in this small tutorial.