Add basic online API support.

osu.Game/Online/API/APIRequest.cs

@@ -0,0 +1,93 @@
+//Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+//Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using osu.Framework.IO.Network;
+
+namespace osu.Game.Online.API
+{
+    /// <summary>
+    /// An API request with a well-defined response type.
+    /// </summary>
+    /// <typeparam name="T">Type of the response (used for deserialisation).</typeparam>
+    internal class APIRequest<T> : APIRequest
+    {
+        protected override WebRequest CreateWebRequest() => new JsonWebRequest<T>(Uri);
+
+        public APIRequest()
+        {
+            base.Success += onSuccess;
+        }
+
+        private void onSuccess()
+        {
+            Success?.Invoke((WebRequest as JsonWebRequest<T>).ResponseObject);
+        }
+
+        public new event APISuccessHandler<T> Success;
+    }
+
+    /// <summary>
+    /// AN API request with no specified response type.
+    /// </summary>
+    public class APIRequest
+    {
+        /// <summary>
+        /// The maximum amount of time before this request will fail.
+        /// </summary>
+        internal int Timeout = WebRequest.DEFAULT_TIMEOUT;
+
+        protected virtual string Target => string.Empty;
+
+        protected virtual WebRequest CreateWebRequest() => new WebRequest(Uri);
+
+        protected virtual string Uri => $@"{api.Endpoint}/api/v2/{Target}";
+
+        private double remainingTime => Math.Max(0, Timeout - (DateTime.Now.TotalMilliseconds() - (startTime ?? 0)));
+
+        internal bool ExceededTimeout => remainingTime == 0;
+
+        private double? startTime;
+
+        internal double StartTime => startTime ?? -1;
+
+        private APIAccess api;
+        protected WebRequest WebRequest;
+
+        public event APISuccessHandler Success;
+        public event APIFailureHandler Failure;
+
+        internal void Perform(APIAccess api)
+        {
+            if (startTime == null)
+                startTime = DateTime.Now.TotalMilliseconds();
+
+            this.api = api;
+
+            if (remainingTime <= 0)
+                throw new TimeoutException(@"API request timeout hit");
+
+            WebRequest = CreateWebRequest();
+            WebRequest.RetryCount = 0;
+            WebRequest.Headers[@"Authorization"] = $@"Bearer {api.AccessToken}";
+
+            WebRequest.BlockingPerform();
+
+            //OsuGame.Scheduler.Add(delegate {
+                Success?.Invoke();
+            //});
+        }
+
+        internal void Fail(Exception e)
+        {
+            WebRequest?.Abort();
+            //OsuGame.Scheduler.Add(delegate {
+                Failure?.Invoke(e);
+            //});
+        }
+    }
+
+    public delegate void APIFailureHandler(Exception e);
+    public delegate void APISuccessHandler();
+    public delegate void APISuccessHandler<T>(T content);
+}