ServiceStack/src/ServiceStack.Client/AsyncUtils.cs at master · WebFirst/ServiceStack · GitHub

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// Copyright (c) ServiceStack, Inc. All Rights Reserved.
// License: https://raw.github.com/ServiceStack/ServiceStack/master/license.txt

/*
 * Keep as much platform specific stuff here
 */

using System;
using System.IO;
using System.Net;
using System.Threading;
using System.Threading.Tasks;

namespace ServiceStack
{
    public interface ITimer : IDisposable
    {
        void Cancel();
    }

    public delegate void ProgressDelegate(long done, long total);

    internal static class AsyncUtils
    {
        internal static HttpWebRequest CreateHttpWebRequest(this AsyncServiceClient client, string requestUri)
        {
            var webRequest = PclExport.Instance.CreateWebRequest(requestUri,
                emulateHttpViaPost:client.EmulateHttpViaPost);

            PclExport.Instance.Config(webRequest);
            client.CancelAsyncFn = webRequest.Abort;

            if (client.StoreCookies)
            {
                PclExportClient.Instance.SetCookieContainer(webRequest, client);
            }

            if (!client.DisableAutoCompression)
            {
                PclExport.Instance.AddCompression(webRequest);
            }

            return webRequest;
        }
    }

#if !NET45
    internal class TaskConstants<T>
    {
        internal static readonly Task<T> Canceled;

        static TaskConstants()
        {
            var tcs = new TaskCompletionSource<T>();
            tcs.SetCanceled();
            Canceled = tcs.Task;
        }
    }

    internal class TaskConstants
    {
        public static readonly Task Finished;
        public static readonly Task Canceled;

        static TaskConstants()
        {
            var tcs = new TaskCompletionSource<object>();
            tcs.SetResult(null);
            Finished = tcs.Task;

            tcs = new TaskCompletionSource<object>();
            tcs.SetCanceled();
            Canceled = tcs.Task;
        }
    }

    internal static class AsyncNet45StreamExtensions
    {
        public static Task FlushAsync(this Stream stream)
        {
            return stream.FlushAsync(CancellationToken.None);
        }

        public static Task FlushAsync(this Stream stream, CancellationToken token)
        {
            return token.IsCancellationRequested
                ? TaskConstants.Canceled
                : Task.Factory.StartNew(l => ((Stream)l).Flush(), stream, token, TaskCreationOptions.None, TaskScheduler.Default);
        }

        public static Task<int> ReadAsync(this Stream stream, byte[] buffer, int offset, int count)
        {
            return stream.ReadAsync(buffer, offset, count, CancellationToken.None);
        }

        public static Task WriteAsync(this Stream stream, byte[] buffer)
        {
            return stream.WriteAsync(buffer, 0, buffer.Length, CancellationToken.None);
        }

        public static Task WriteAsync(this Stream stream, byte[] buffer, int offset, int count)
        {
            return stream.WriteAsync(buffer, offset, count, CancellationToken.None);
        }

#if ! (PCL || NETSTANDARD1_1 || NETSTANDARD2_0)
        public static Task<int> ReadAsync(this Stream stream, byte[] buffer, int offset, int count, CancellationToken token)
        {
            return token.IsCancellationRequested
                ? TaskConstants<int>.Canceled
                : Task<int>.Factory.FromAsync(stream.BeginRead, result => stream.CanRead ? stream.EndRead(result) : 0, buffer, offset, count, null);
        }

        public static Task WriteAsync(this Stream stream, byte[] buffer, int offset, int count, CancellationToken token)
        {
            return Task.Factory.FromAsync(stream.BeginWrite, stream.EndWrite, buffer, offset, count, null);
        }
#endif

    }
#endif

}