MeteorSwift.swift

protocol Method {
  associatedtype ReturnType

  static var name: String { get }
  var parameters: [AnyObject]? { get }
}

extension METDDPClient {
  func callMethod<T : Method>(method: T) -> Promise<T.ReturnType, MeteorError> {
    return callMethodWithNamePromise(T.name, parameters: method.parameters)
  }
}

protocol SubscriptionRequest {
  static var name: String { get }
  var parameters: [AnyObject]? { get }
}

extension METDDPClient {
  func addSubscription<T : SubscriptionRequest>(request: T) -> Promise<METSubscription, MeteorError> {
    return addSubscriptionPromise(T.name, parameters: request.parameters)
  }
}

// Examples

struct RegisterPushToken {
  let deviceId: String
  let token: String
  let tokenType: String
}

extension RegisterPushToken: Method {
  typealias ReturnType = Bool

  static var name: String { return "RegisterPushToken" }

  var parameters: [AnyObject]? {
    return [deviceId,
            ["token": token,
             "tokenType": tokenType]]
  }
}