Sync syntax Vapor route

DispatchQueue+EventLoopFuture.swift

import class Dispatch.DispatchQueue
import NIO

public extension DispatchQueue {
    /// `DispatchQueue.async` but returning a NIO future wrapping the closure return.
    func async<Value>(on eventLoop: EventLoop, use closure: @escaping () throws -> Value) -> EventLoopFuture<Value> {
        let promise = eventLoop.makePromise(of: Value.self)
        async {
            do {
                promise.succeed(try closure())
            } catch {
                promise.fail(error)
            }
        }
        return promise.futureResult
    }
}

SynchSynthaxRoutes.swift

import Vapor
import Fluent

func routes(_ app: Application) throws {
    
    app.get("hello") { req -> EventLoopFuture<Todo> in
        return DispatchQueue.global().async(on: req.eventLoop) {
            let todo = Todo(title: "Synchronous synthax")
            try todo.save(on: req.db).wait()
            return todo
        }
    }
    
}