/// <summary>Creates a request to initialize a request.</summary>
private HttpRequestMessage CreateInitializeRequest()
{
var builder = new RequestBuilder()
{
BaseUri = new Uri(Service.BaseUri),
Path = Path,
Method = HttpMethod,
};
// init parameters
builder.AddParameter(RequestParameterType.Query, "key", Service.ApiKey);
builder.AddParameter(RequestParameterType.Query, "uploadType", "resumable");
SetAllPropertyValues(builder);
HttpRequestMessage request = builder.CreateRequest();
if (ContentType != null)
{
request.Headers.Add(PayloadContentTypeHeader, ContentType);
}
// if the length is unknown at the time of this request, omit "X-Upload-Content-Length" header
if (StreamLength != UnknownSize)
{
request.Headers.Add(PayloadContentLengthHeader, StreamLength.ToString());
}
Service.SetRequestSerailizedContent(request, Body);
return(request);
}
/// <summary>Asynchronously resumes the upload form the last point it was interrupted.</summary>
/// <param name="cancellationToken">A cancellation token to cancel operation.</param>
public async Task <IUploadProgress> ResumeAsync(CancellationToken cancellationToken)
{
if (UploadUri == null)
{
Logger.Info("There isn't any upload in progress, so starting to upload again");
return(await UploadAsync(cancellationToken).ConfigureAwait(false));
}
// The first "resuming" request is to query the server in which point the upload was interrupted.
var range = String.Format("bytes */{0}", StreamLength < 0 ? "*" : StreamLength.ToString());
HttpRequestMessage request = new RequestBuilder()
{
BaseUri = UploadUri,
Method = HttpConsts.Put
}.CreateRequest();
request.SetEmptyContent().Headers.Add("Content-Range", range);
try
{
HttpResponseMessage response;
using (var callback = new ServerErrorCallback(this))
{
response = await Service.HttpClient.SendAsync(request, cancellationToken)
.ConfigureAwait(false);
}
if (await HandleResponse(response).ConfigureAwait(false))
{
// All the media was successfully upload.
UpdateProgress(new ResumableUploadProgress(UploadStatus.Completed, BytesServerReceived));
return(Progress);
}
}
catch (TaskCanceledException ex)
{
Logger.Error(ex, "MediaUpload[{0}] - Task was canceled", UploadUri);
UpdateProgress(new ResumableUploadProgress(ex, BytesServerReceived));
throw ex;
}
catch (Exception ex)
{
Logger.Error(ex, "MediaUpload[{0}] - Exception occurred while resuming uploading media", UploadUri);
UpdateProgress(new ResumableUploadProgress(ex, BytesServerReceived));
return(Progress);
}
// Continue to upload the media stream.
return(await UploadCoreAsync(cancellationToken).ConfigureAwait(false));
}
/// <summary>
/// Build a content range header of the form: "bytes X-Y/T" where:
/// <list type="">
/// <item>X is the first byte being sent.</item>
/// <item>Y is the last byte in the range being sent (inclusive).</item>
/// <item>T is the total number of bytes in the range or * for unknown size.</item>
/// </list>
/// </summary>
/// <remarks>
/// See: RFC2616 HTTP/1.1, Section 14.16 Header Field Definitions, Content-Range
/// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.16
/// </remarks>
/// <param name="chunkStart">Start of the chunk.</param>
/// <param name="chunkSize">Size of the chunk being sent.</param>
/// <returns>The content range header value.</returns>
private string GetContentRangeHeader(long chunkStart, long chunkSize)
{
string strLength = StreamLength < 0 ? "*" : StreamLength.ToString();
// If a file of length 0 is sent, one chunk needs to be sent with 0 size.
// This chunk cannot be specified with the standard (inclusive) range header.
// In this case, use * to indicate no bytes sent in the Content-Range header.
if (chunkStart == 0 && chunkSize == 0 && StreamLength == 0)
{
return(ZeroByteContentRangeHeader);
}
else
{
long chunkEnd = chunkStart + chunkSize - 1;
return(String.Format("bytes {0}-{1}/{2}", chunkStart, chunkEnd, strLength));
}
}
protected override Task <HttpResponseMessage> SendAsyncCore(HttpRequestMessage request,
CancellationToken cancellationToken)
{
var response = new HttpResponseMessage();
var range = string.Empty;
switch (Calls)
{
case 1:
if (PathParameters == null)
{
Assert.That(request.RequestUri.AbsolutePath, Is.EqualTo("/"));
}
else
{
Assert.That(request.RequestUri.AbsolutePath, Is.EqualTo("/" + PathParameters));
}
Assert.That(request.RequestUri.Query, Is.EqualTo("?uploadType=resumable" + QueryParameters));
Assert.That(request.Headers.GetValues("X-Upload-Content-Type").First(),
Is.EqualTo("text/plain"));
Assert.That(request.Headers.GetValues("X-Upload-Content-Length").First(),
Is.EqualTo(StreamLength.ToString()));
response.Headers.Location = uploadUri;
break;
case 2:
Assert.That(request.RequestUri, Is.EqualTo(uploadUri));
range = String.Format("bytes 0-{0}/{1}", StreamLength - 1, StreamLength);
Assert.That(request.Content.Headers.GetValues("Content-Range").First(), Is.EqualTo(range));
Assert.That(request.Content.Headers.ContentLength, Is.EqualTo(StreamLength));
break;
}
TaskCompletionSource <HttpResponseMessage> tcs = new TaskCompletionSource <HttpResponseMessage>();
tcs.SetResult(response);
return(tcs.Task);
}
/// <summary>
/// Asynchronously resumes the upload from the last point it was interrupted.
/// Use when the program was restarted and you wish to resume the upload that was in progress when the program was halted.
/// Implemented only for ContentStreams where .CanSeek is True.
/// </summary>
/// <remarks>
/// In your application's UploadSessionData Event Handler, store UploadUri.AbsoluteUri property value (resumable session URI string value)
/// to persistent storage for use with Resume() or ResumeAsync() upon a program restart.
/// It is strongly recommended that the FullPathFilename of the media file that is being uploaded is saved also so that a subsequent execution of the
/// program can compare the saved FullPathFilename value to the FullPathFilename of the media file that it has opened for uploading.
/// You do not need to seek to restart point in the ContentStream file.
/// </remarks>
/// <param name="uploadUri">VideosResource.InsertMediaUpload UploadUri property value that was saved to persistent storage during a prior execution.</param>
/// <param name="cancellationToken">A cancellation token to cancel the asynchronous operation.</param>
public async Task <IUploadProgress> ResumeAsync(Uri uploadUri, CancellationToken cancellationToken)
{
// When called with uploadUri parameter of non-null value, the UploadUri is being
// provided upon a program restart to resume a previously interrupted upload.
if (uploadUri != null)
{
if (ContentStream.CanSeek)
{
Logger.Info("Resuming after program restart: UploadUri={0}", uploadUri);
UploadUri = uploadUri;
StreamLength = ContentStream.Length;
}
else
{
throw new NotImplementedException("Resume after program restart not allowed when ContentStream.CanSeek is false");
}
}
if (UploadUri == null)
{
Logger.Info("There isn't any upload in progress, so starting to upload again");
return(await UploadAsync(cancellationToken).ConfigureAwait(false));
}
// The first "resuming" request is to query the server in which point the upload was interrupted.
var range = String.Format("bytes */{0}", StreamLength < 0 ? "*" : StreamLength.ToString());
HttpRequestMessage request = new RequestBuilder()
{
BaseUri = UploadUri,
Method = HttpConsts.Put
}.CreateRequest();
request.SetEmptyContent().Headers.Add("Content-Range", range);
try
{
HttpResponseMessage response;
using (var callback = new ServerErrorCallback(this))
{
response = await HttpClient.SendAsync(request, cancellationToken)
.ConfigureAwait(false);
}
if (await HandleResponse(response).ConfigureAwait(false))
{
// All the media was successfully upload.
UpdateProgress(new ResumableUploadProgress(UploadStatus.Completed, BytesServerReceived));
return(Progress);
}
}
catch (TaskCanceledException ex)
{
Logger.Error(ex, "MediaUpload[{0}] - Task was canceled", UploadUri);
UpdateProgress(new ResumableUploadProgress(ex, BytesServerReceived));
throw ex;
}
catch (Exception ex)
{
Logger.Error(ex, "MediaUpload[{0}] - Exception occurred while resuming uploading media", UploadUri);
UpdateProgress(new ResumableUploadProgress(ex, BytesServerReceived));
return(Progress);
}
// Continue to upload the media stream.
return(await UploadCoreAsync(cancellationToken).ConfigureAwait(false));
}