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osu-lazer/osu.Game/Online/API/APIRequest.cs
2018-06-08 14:37:48 +09:00

135 lines
4.3 KiB
C#

// Copyright (c) 2007-2018 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>
public abstract class APIRequest<T> : APIRequest
{
protected override WebRequest CreateWebRequest() => new JsonWebRequest<T>(Uri);
public T Result => ((JsonWebRequest<T>)WebRequest).ResponseObject;
protected APIRequest()
{
base.Success += onSuccess;
}
private void onSuccess() => Success?.Invoke(Result);
/// <summary>
/// Invoked on successful completion of an API request.
/// This will be scheduled to the API's internal scheduler (run on update thread automatically).
/// </summary>
public new event APISuccessHandler<T> Success;
}
/// <summary>
/// AN API request with no specified response type.
/// </summary>
public abstract class APIRequest
{
/// <summary>
/// The maximum amount of time before this request will fail.
/// </summary>
public 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 - (DateTimeOffset.UtcNow - (startTime ?? DateTimeOffset.MinValue)).TotalMilliseconds);
public bool ExceededTimeout => remainingTime == 0;
private DateTimeOffset? startTime;
protected APIAccess API;
protected WebRequest WebRequest;
/// <summary>
/// Invoked on successful completion of an API request.
/// This will be scheduled to the API's internal scheduler (run on update thread automatically).
/// </summary>
public event APISuccessHandler Success;
/// <summary>
/// Invoked on failure to complete an API request.
/// This will be scheduled to the API's internal scheduler (run on update thread automatically).
/// </summary>
public event APIFailureHandler Failure;
private bool cancelled;
private Action pendingFailure;
public void Perform(APIAccess api)
{
API = api;
if (checkAndProcessFailure())
return;
if (startTime == null)
startTime = DateTimeOffset.UtcNow;
if (remainingTime <= 0)
throw new TimeoutException(@"API request timeout hit");
WebRequest = CreateWebRequest();
WebRequest.Failed += Fail;
WebRequest.AllowRetryOnTimeout = false;
WebRequest.AddHeader("Authorization", $"Bearer {api.AccessToken}");
if (checkAndProcessFailure())
return;
if (!WebRequest.Aborted) //could have been aborted by a Cancel() call
WebRequest.Perform();
if (checkAndProcessFailure())
return;
api.Schedule(delegate { Success?.Invoke(); });
}
public void Cancel() => Fail(new OperationCanceledException(@"Request cancelled"));
public void Fail(Exception e)
{
cancelled = true;
WebRequest?.Abort();
pendingFailure = () => Failure?.Invoke(e);
checkAndProcessFailure();
}
/// <summary>
/// Checked for cancellation or error. Also queues up the Failed event if we can.
/// </summary>
/// <returns>Whether we are in a failed or cancelled state.</returns>
private bool checkAndProcessFailure()
{
if (API == null || pendingFailure == null) return cancelled;
API.Schedule(pendingFailure);
pendingFailure = null;
return true;
}
}
public delegate void APIFailureHandler(Exception e);
public delegate void APISuccessHandler();
public delegate void APIProgressHandler(long current, long total);
public delegate void APISuccessHandler<in T>(T content);
}