CrashSpace Sign JSON parsing in Swift, using struct, CrashSpace Sign JSON now returns an 'is_open' flag and a 'minutes_open' value

CrashSpaceSignJsonParseStructNew.swift

//: NEW CrashSpace Sign JSON parsing in Swift, using struct
//  CrashSpace Sign JSON now returns an 'is_open' flag and a 'minutes_open' value

import Cocoa
import Foundation

struct ButtonPress {
    let id: String
    let msg: String
    let diff_mins: Int
    let date: String
    let date_epoch: String
    let type: String
}

extension ButtonPress {
    // 'json' is dictionary where key is string, value is any
    init?(json: [String: Any]) {
        guard let id = json["id"] as? String,
            let msg = json["msg"] as? String,
            let diff_mins = json["diff_mins_max"] as? Int,
            let date = json["date"] as? String,
            let date_epoch = json["date_epoch"] as? String,
            let type = json["type"] as? String
            else {
                return nil
        }
        self.id = id
        self.msg = msg
        self.diff_mins = diff_mins
        self.date = date
        self.date_epoch = date_epoch
        self.type = type
    }
}

// array to hold our future list of ButtonPress objects
var buttonPresses = [ButtonPress]()
var isOpen = false
var minutesLeft = 0

let urlString = "https://crashspacela.com/sign2/json/";

let url = URL(string: urlString)

let task = URLSession.shared.dataTask(with:url!, completionHandler: {
    (data, response, error) in
    
    if error != nil {
        print("oh no \(error)")
    } else {
        print("hi there; we got server response")
        do {
            // convert json string to object of dictionary of [string: any]
            let buttonData = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! [String:Any]
            
            if let isOpen = buttonData["is_open"] as? Bool {
                print("isOpen value: \(isOpen)")
            }
            if let minutesLeft = buttonData["minutes_left"] as? Double {
                print("minutesLeft value: \(minutesLeft)")
            }
            
            // from https://developer.apple.com/swift/blog/?id=37
            // convert json-ish array of 'Any' to struct, using extension
            if let buttonPressesJson = buttonData["button_presses"] as? [Any] {
                print("parsing buttonPress array...")
                
                for item in buttonPressesJson {
                    let item = item as! [String: Any]
                    if let buttonPress = ButtonPress(json: item) {
                        buttonPresses.append(buttonPress)
                    }
                }
            }
            
            print("\nbuttonPress structs");
            print("-------------");
            
            for b in buttonPresses {
                print("buttonPress: id:\(b.id) msg:'\(b.msg)' for \(b.diff_mins) minutes at \(b.date)")
            }
            
        } catch let error as NSError {
            print(error)
        }
    }
    
})

task.resume()


// in playground, loop forever so the task above completes
var waiting = true
while( waiting ) {
    sleep(10)
    print("sleeping...")
}