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| 1 | +// |
| 2 | +// OpenWeather.swift |
| 3 | +// hap-server |
| 4 | +// |
| 5 | + |
| 6 | +import Foundation |
| 7 | +import func Evergreen.getLogger |
| 8 | + |
| 9 | +fileprivate let logger = getLogger("openweather") |
| 10 | + |
| 11 | +public class OpenWeather { |
| 12 | + |
| 13 | + public var temperature: Double { |
| 14 | + update() |
| 15 | + return _temperature |
| 16 | + } |
| 17 | + |
| 18 | + public var humidity: Int { |
| 19 | + update() |
| 20 | + return _humidity |
| 21 | + } |
| 22 | + |
| 23 | + public enum Units: String { |
| 24 | + case imperial |
| 25 | + case metric |
| 26 | + } |
| 27 | + |
| 28 | + // swiftlint:disable identifier_name |
| 29 | + public struct Measurement: Decodable { |
| 30 | + let temp: Double |
| 31 | + let pressure: Int |
| 32 | + let humidity: Int |
| 33 | + let temp_min: Int? |
| 34 | + let temp_max: Int? |
| 35 | + } |
| 36 | + public struct OpenWeatherResponse: Decodable { |
| 37 | + let main: Measurement |
| 38 | + let name: String |
| 39 | + } |
| 40 | + |
| 41 | + let appid: String |
| 42 | + let name: String |
| 43 | + let lat: String |
| 44 | + let lon: String |
| 45 | + let units: Units |
| 46 | + |
| 47 | + private var _temperature: Double = 0.0 |
| 48 | + private var _humidity: Int = 50 |
| 49 | + |
| 50 | + private let decoder = JSONDecoder() |
| 51 | + |
| 52 | + private let limit: TimeInterval = 900 // 15 Minutes |
| 53 | + private var lastExecutedAt: Date? |
| 54 | + private let updateQueue = DispatchQueue(label: "openweather", attributes: []) |
| 55 | + |
| 56 | + private var observers = [(OpenWeather) -> Void]() |
| 57 | + |
| 58 | + public init(name: String, lat: Double, lon: Double, appid: String, units: Units = .metric) { |
| 59 | + precondition((lat >= -90.0) && (lat <= 90.0), "Latitude \(lat) is out of range") |
| 60 | + precondition((lon >= -180.0) && (lon <= 180.0), "Longitude \(lon) is out of range") |
| 61 | + |
| 62 | + self.name = name |
| 63 | + self.appid = appid |
| 64 | + self.lat = "\(lat)" |
| 65 | + self.lon = "\(lon)" |
| 66 | + self.units = units |
| 67 | + |
| 68 | + self.update() |
| 69 | + } |
| 70 | + |
| 71 | + public func whenUpdated(closure: @escaping (OpenWeather) -> Void) { |
| 72 | + observers.append(closure) |
| 73 | + } |
| 74 | + |
| 75 | + func update() { |
| 76 | + updateQueue.async { |
| 77 | + let now = Date() |
| 78 | + |
| 79 | + // Lookup last executed |
| 80 | + let timeInterval = now.timeIntervalSince(self.lastExecutedAt ?? .distantPast) |
| 81 | + |
| 82 | + // Only refresh the values if the last request was older than 'limit' |
| 83 | + if timeInterval > self.limit { |
| 84 | + // Record execution |
| 85 | + self.lastExecutedAt = now |
| 86 | + |
| 87 | + self.updateNow() |
| 88 | + } |
| 89 | + } |
| 90 | + } |
| 91 | + |
| 92 | + func updateNow() { |
| 93 | + |
| 94 | + var urlQuery = URLComponents(string: "https://api.openweathermap.org/data/2.5/weather")! |
| 95 | + urlQuery.queryItems = [ |
| 96 | + URLQueryItem(name: "lat", value: lat), |
| 97 | + URLQueryItem(name: "lon", value: lon), |
| 98 | + URLQueryItem(name: "APPID", value: appid), |
| 99 | + URLQueryItem(name: "units", value: units.rawValue)] |
| 100 | + |
| 101 | + let url = urlQuery.url! |
| 102 | + logger.debug("URL: \(url)") |
| 103 | + |
| 104 | + let task = URLSession.shared.dataTask(with: url) { data, response, error in |
| 105 | + if let error = error { |
| 106 | + logger.debug("OpenWeather connection error \(error)") |
| 107 | + return |
| 108 | + } |
| 109 | + guard let httpResponse = response as? HTTPURLResponse, |
| 110 | + (200...299).contains(httpResponse.statusCode) else { |
| 111 | + logger.debug("OpenWeather Server error \(response)") |
| 112 | + return |
| 113 | + } |
| 114 | + |
| 115 | + if let mimeType = httpResponse.mimeType, mimeType == "application/json", |
| 116 | + let data = data, |
| 117 | + let weatherReport = try? self.decoder.decode(OpenWeatherResponse.self, from: data) { |
| 118 | + |
| 119 | + DispatchQueue.main.sync { |
| 120 | + self._temperature = weatherReport.main.temp |
| 121 | + self._humidity = weatherReport.main.humidity |
| 122 | + for observer in self.observers { |
| 123 | + observer(self) |
| 124 | + } |
| 125 | + } |
| 126 | + |
| 127 | + } |
| 128 | + } |
| 129 | + task.resume() |
| 130 | + |
| 131 | + } |
| 132 | + |
| 133 | +} |
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