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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Windows.Storage.Streams;
using WinRtHttpHelper.Data;
namespace WinRtHttpHelper
{
public class HttpDownLoadContinueHelper : IDisposable, IContinueDownLoad
{
/*#region Singleton
private static HttpDownLoadContinueHelper _instance = null;
private static readonly object lockObject = new object();
public static HttpDownLoadContinueHelper Instance
{
get
{
if (_instance == null)
{
lock (lockObject)
{
_instance = new HttpDownLoadContinueHelper();
_instance.hc = new HttpClient();
_instance.cts = new CancellationTokenSource();
if(_instance.DownloadBytesCount == null)
{
_instance.DownloadBytesCount = new DownLoadBytes();
}
_instance.Bytes = new List<byte>();
}
}
return _instance;
}
}
#endregion*/
private HttpClient hc = null;
private CancellationTokenSource cts = null;
private HttpRequestMessage request = null;
private HttpResponseMessage response = null;
//切片大小
private long percentage = 0;
//切片块数 进度系数 已完成的比例
private int percentageCoefficient = 0, progressCoefficient = 0, completePercentage = 0;
//下载拼装的所有字节数
private List<byte> Bytes = null;
//下载是否为暂停，默认为false没有暂停
private bool isPause = false;
//是否服务器支持断点续传
private bool isRange = true;
//不声明委托
//public delegate void DownLoadChanging(object sender, DownLoadChangingEventArgs args);
/// <summary>
/// 下载的实时进度事件
/// </summary>
public event EventHandler<DownLoadChangingEventArgs> DownLoadChanging;
public event EventHandler<DownLoadCompleteEventArgs> DownLoadComplete;
/// <summary>
/// 已下载的字节数和总的字节数
/// </summary>
public DownLoadBytes DownloadBytesCount
{
get;
private set;
}
public HttpDownLoadContinueHelper()
{
hc = new HttpClient();
cts = new CancellationTokenSource();
if (DownloadBytesCount == null)
{
DownloadBytesCount = new DownLoadBytes();
}
Bytes = new List<byte>();
}
private void TriggerDownLoadChanging(DownLoadChangingEventArgs e)
{
EventHandler<DownLoadChangingEventArgs> handler = DownLoadChanging;
if (handler != null)
{
handler(this, e);
}
}
private void TriggerDownLoadComplete(DownLoadCompleteEventArgs e)
{
EventHandler<DownLoadCompleteEventArgs> handler = DownLoadComplete;
if (handler != null)
{
handler(this, e);
}
}
//暂时弃用
private async Task<long> ReadBytesFromServer(Stream stream, List<byte> byteAll, CancellationToken ct)
{
if (stream == null)
{
return 0;
}
int readCount = 0;
byte[] hasRead = new byte[1024];
long read = DownloadBytesCount.BytesReceived;
try
{
do
{
if (ct.IsCancellationRequested)
{
break;
}
readCount = await stream.ReadAsync(hasRead, 0, hasRead.Length, ct);
read += readCount;
double percent = (double)read * 100 / (double)DownloadBytesCount.BytesReceived;
percent = Math.Round(percent, MidpointRounding.ToEven);
TriggerDownLoadChanging(new DownLoadChangingEventArgs(DownloadBytesCount, Convert.ToInt32(percent), null));
if (readCount == 1024)
{
byteAll.AddRange(hasRead);
}
else
{
byte[] canbeAddBytes = hasRead.Take(readCount).ToArray();
byteAll.AddRange(canbeAddBytes);
}
} while (readCount != 0 && read <= DownloadBytesCount.TotalBytesToReceive);
}
catch (TaskCanceledException)
{
return read;
}
return read;
}
/// <summary>
/// 分析下载的资源大小，按照规则分配下载的策略
/// </summary>
/// <param name="uri"></param>
/// <returns></returns>
private async Task<long> GetTotalBytes(Uri uri)
{
request = new HttpRequestMessage(HttpMethod.Get, uri);
request.Headers.Range = new RangeHeaderValue(0, 0);
response = await hc.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cts.Token);
if (response.Content.Headers.ContentRange != null)
DownloadBytesCount.TotalBytesToReceive = response.Content.Headers.ContentRange.Length.Value;
else
{
isRange = false;
return DownloadBytesCount.TotalBytesToReceive = response.Content.Headers.ContentLength.Value;
}
if (response.Content.Headers.ContentRange.Length.Value > 10000)
{
percentageCoefficient = 100;
progressCoefficient = 1;
}
if (response.Content.Headers.ContentRange.Length.Value > 1000 && response.Content.Headers.ContentRange.Length.Value < 10000)
{
percentageCoefficient = progressCoefficient = 10;
}
if (response.Content.Headers.ContentRange.Length.Value < 1000)
{
percentageCoefficient = 1;
progressCoefficient = 100;
}
percentage = DownloadBytesCount.TotalBytesToReceive / percentageCoefficient;
completePercentage = Convert.ToInt32(DownloadBytesCount.BytesReceived / percentage);
return response.Content.Headers.ContentRange.Length.Value;
}
//0-100 101-200 101得到已下载大小 from 需要 -1，(from - 1)
//0-100 101-200 100得到已下载大小 from 不需要 -1，(from)
private async Task<long> GetTotalBytes(Uri uri, long fromBytes = 0)
{
if (DownloadBytesCount == null)
{
DownloadBytesCount = new DownLoadBytes();
}
request = new HttpRequestMessage(HttpMethod.Get, uri);
request.Headers.Range = new RangeHeaderValue(0, 0);
response = await hc.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cts.Token);
DownloadBytesCount.TotalBytesToReceive = response.Content.Headers.ContentRange.Length.Value;
if (response.Content.Headers.ContentRange.Length.Value > 10000)
{
percentageCoefficient = 100;
progressCoefficient = 1;
}
if (response.Content.Headers.ContentRange.Length.Value > 1000 && response.Content.Headers.ContentRange.Length.Value < 10000)
{
percentageCoefficient = progressCoefficient = 10;
}
if (response.Content.Headers.ContentRange.Length.Value < 1000)
{
percentageCoefficient = 1;
progressCoefficient = 100;
}
percentage = DownloadBytesCount.TotalBytesToReceive / percentageCoefficient;
//completePercentage = Convert.ToInt32((fromBytes - 1) / percentage);
completePercentage = Convert.ToInt32((fromBytes) / percentage);
DownloadBytesCount.BytesReceived = fromBytes;
return response.Content.Headers.ContentRange.Length.Value;
}
//暂时不实现
private async Task<long> GetTotalBytes(Uri uri, long fromBytes = 0, long toBytes = 0)
{
return 0;
}
//分段设置的方法
private async Task<IRandomAccessStream> DownLoadIRandomAccessStream(Uri uri, long rangeFromValue, long rangeToValue, CancellationToken ct)
{
request = new HttpRequestMessage(HttpMethod.Get, uri);
//var request = new HttpRequestMessage(HttpMethod.Get, uri);
request.Headers.Add("keepAlive", "false");
//request.Headers.Range = new RangeHeaderValue(0, 500);
if (rangeToValue > 0 && rangeToValue > rangeFromValue)
{
request.Headers.Add("Range", "bytes=" + rangeFromValue + "-" + rangeToValue);
}
else
{
request.Headers.Add("Range", "bytes=" + rangeFromValue + "-");
}
response = await hc.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, ct);
//response = await hc.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
using (Stream responseStream = await response.Content.ReadAsStreamAsync())
{
if (responseStream != null)
{
var randomAccessStream = new InMemoryRandomAccessStream();
var outputStream = randomAccessStream.GetOutputStreamAt(0);
await RandomAccessStream.CopyAsync(responseStream.AsInputStream(), outputStream);
DownloadBytesCount.BytesReceived = Convert.ToInt64(randomAccessStream.Size);
return randomAccessStream as IRandomAccessStream;
}
return null;
}
}
//下载全部
private async Task<IRandomAccessStream> DownLoadIRandomAccessStream(Uri uri, CancellationToken ct)
{
request = new HttpRequestMessage(HttpMethod.Get, uri);
request.Headers.Add("keepAlive", "false");
response = await hc.SendAsync(request, ct);
DownloadBytesCount.TotalBytesToReceive = response.Content.Headers.ContentLength.Value;
byte[] bytes = await response.Content.ReadAsByteArrayAsync();
InMemoryRandomAccessStream randomAccessStream = await ByteToInMemoryRandomAccessStream(bytes);
DownloadBytesCount.BytesReceived = Convert.ToInt64(randomAccessStream.Size);
return randomAccessStream as IRandomAccessStream;
}
public void Dispose()
{
CancelDownload();
hc.Dispose();
}
/// <summary>
/// 暂停下载
/// </summary>
/// <returns></returns>
public async Task<IRandomAccessStream> SuspendDownload()
{
if (!isPause)
{
isPause = true;
CancelDownload();
return (await this.ByteToInMemoryRandomAccessStream(Bytes.ToArray()));
}
return null;
}
/// <summary>
/// 继续下载
/// </summary>
/// <param name="uri"></param>
/// <param name="formBytes"></param>
/// <param name="toBytes"></param>
/// <returns></returns>
public async Task<IRandomAccessStream> ContinueDownload(Uri uri, long fromBytes = 0, long toBytes = 0, byte[] CompletedBytes = null)
{
if (isRange)
{
hc = new HttpClient();
cts = new CancellationTokenSource();
byte[] bytes = null;
if (Bytes == null)
{
Bytes = new List<byte>();
}
Bytes.AddRange(CompletedBytes);
IRandomAccessStream idaStream = null;
try
{
idaStream = await DownLoadIRandomAccessStream(uri, fromBytes, toBytes, cts.Token);
bytes = Combine(idaStream);
TriggerDownLoadComplete(new DownLoadCompleteEventArgs((await this.ByteToInMemoryRandomAccessStream((byte[])bytes.Clone()))));
return (await this.ByteToInMemoryRandomAccessStream(bytes));
}
catch (Exception ex)
{
//return null;
Debug.WriteLine(ex.Message);
return this.ByteToInMemoryRandomAccessStream(bytes).Result;
}
}
return null;
}
/// <summary>
/// 继续下载
/// </summary>
/// <param name="uri"></param>
/// <param name="fromBytes"></param>
/// <returns></returns>
public async Task<IRandomAccessStream> ContinueDownload(Uri uri, long fromBytes = 0, byte[] CompletedBytes = null)
{
if (isRange)
{
hc = new HttpClient();
cts = new CancellationTokenSource();
if (Bytes == null)
{
Bytes = new List<byte>();
}
//防止字节数组传递到事件，修改数组内容，所以拼大数组时，做了一个拷贝浅表副本
Bytes.AddRange((byte[])CompletedBytes.Clone());
byte[] bytes = null;
IRandomAccessStream idaStream = null;
await GetTotalBytes(uri, fromBytes);
TriggerDownLoadChanging(new DownLoadChangingEventArgs(DownloadBytesCount, completePercentage, CompletedBytes));
try
{
//100, 10, 1
for (int i = completePercentage; i < percentageCoefficient; )
{
if (cts.IsCancellationRequested)
{
return (await this.ByteToInMemoryRandomAccessStream(bytes));
}
if (i == 0)
{
idaStream = (await DownLoadIRandomAccessStream(uri, i * percentage, (i + 1) * percentage, cts.Token));
}
else
{
idaStream = (await DownLoadIRandomAccessStream(uri, i * percentage + 1, (i + 1) * percentage, cts.Token));
}
if (idaStream != null)
{
bytes = Combine(idaStream);
DownloadBytesCount.BytesReceived = (i + 1) * percentage;
i++;
TriggerDownLoadChanging(new DownLoadChangingEventArgs(DownloadBytesCount, i * progressCoefficient, bytes));
if (i * progressCoefficient == 100)
{
TriggerDownLoadComplete(new DownLoadCompleteEventArgs((await this.ByteToInMemoryRandomAccessStream(bytes))));
}
}
else
{
return (await this.ByteToInMemoryRandomAccessStream(Bytes.ToArray()));
}
}
return (await this.ByteToInMemoryRandomAccessStream(bytes));
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
return this.ByteToInMemoryRandomAccessStream(bytes).Result;
}
}
return null;
}
/// <summary>
/// 继续下载
/// </summary>
/// <param name="uri"></param>
/// <returns></returns>
public async Task<IRandomAccessStream> ContinueDownload(Uri uri)
{
if (isRange)
{
if (isPause)
{
isPause = false;
return (await Download(uri, DownLoadState.Continue));
}
}
else
{
return (await Download(uri, DownLoadState.Start));
}
return null;
}
/// <summary>
/// 取消下载
/// </summary>
public void CancelDownload()
{
cts.Cancel();
cts.Dispose();
request.Dispose();
response.Dispose();
}
/// <summary>
/// 开始下载
/// </summary>
/// <param name="uri"></param>
/// <returns></returns>
public async Task<IRandomAccessStream> StartDownload(Uri uri)
{
isPause = false;
return (await Download(uri));
}
//下载
private async Task<IRandomAccessStream> Download(Uri uri, DownLoadState downLoadState = DownLoadState.Start)
{
hc = new HttpClient();
cts = new CancellationTokenSource();
byte[] bytes = null;
IRandomAccessStream idaStream = null;
if (downLoadState == DownLoadState.Start)
{
DownloadBytesCount = new DownLoadBytes();
Bytes = new List<byte>();
TriggerDownLoadChanging(new DownLoadChangingEventArgs(DownloadBytesCount, 0, bytes));
if (percentage == 0)
{
await GetTotalBytes(uri);
}
}
if (downLoadState == DownLoadState.Continue)
{
await GetTotalBytes(uri);
}
if (isRange)
{
try
{
//100, 10, 1
for (int i = completePercentage; i < percentageCoefficient; )
{
if (cts.IsCancellationRequested)
{
return (await this.ByteToInMemoryRandomAccessStream(bytes));
}
if (i == 0)
{
idaStream = (await DownLoadIRandomAccessStream(uri, i * percentage, (i + 1) * percentage, cts.Token));
}
else
{
idaStream = (await DownLoadIRandomAccessStream(uri, i * percentage + 1, (i + 1) * percentage, cts.Token));
}
if (idaStream != null)
{
bytes = Combine(idaStream);
DownloadBytesCount.BytesReceived = (i + 1) * percentage;
i++;
TriggerDownLoadChanging(new DownLoadChangingEventArgs(DownloadBytesCount, i * progressCoefficient, bytes));
if (i * progressCoefficient == 100)
{
TriggerDownLoadComplete(new DownLoadCompleteEventArgs((await this.ByteToInMemoryRandomAccessStream(bytes))));
}
}
else
{
return (await this.ByteToInMemoryRandomAccessStream(Bytes.ToArray()));
}
}
return (await this.ByteToInMemoryRandomAccessStream(bytes));
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
return this.ByteToInMemoryRandomAccessStream(bytes).Result;
}
}
else
{
idaStream = await DownLoadIRandomAccessStream(uri, 0, -1, cts.Token);
TriggerDownLoadComplete(new DownLoadCompleteEventArgs(idaStream));
return idaStream;
}
}
//合成数据
private byte[] Combine(IRandomAccessStream iRandomAccessStream)
{
Stream stream = WindowsRuntimeStreamExtensions.AsStreamForRead(iRandomAccessStream.GetInputStreamAt(0));
byte[] buffer = new byte[16 * 1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = stream.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
Bytes.AddRange(ms.ToArray());
return Bytes.ToArray();
}
}
//字节数组转换InMemoryRandomAccessStream数据流
private async Task<InMemoryRandomAccessStream> ByteToInMemoryRandomAccessStream(byte[] bytes)
{
InMemoryRandomAccessStream memoryStream = new InMemoryRandomAccessStream();
DataWriter datawriter = new DataWriter(memoryStream.GetOutputStreamAt(0));
datawriter.WriteBytes(bytes);
await datawriter.StoreAsync();
return memoryStream;
}
}
}