Class ResumableUpload

Media upload which uses Google's resumable media upload protocol to upload data.

Inheritance

System.Object

ResumableUpload

ResumableUpload<TRequest>

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: Google.Apis.Upload

Assembly: Google.Apis.dll

Syntax

public abstract class ResumableUpload

Remarks

See: https://developers.google.com/drive/manage-uploads#resumable for more information on the protocol.

Constructors

ResumableUpload(Stream, ResumableUploadOptions)

Creates a ResumableUpload instance.

Declaration

protected ResumableUpload(Stream contentStream, ResumableUploadOptions options)

Parameters

Type	Name	Description
System.IO.Stream	contentStream	The data to be uploaded. Must not be null.
ResumableUploadOptions	options	The options for the upload operation. May be null.

Fields

chunkSize

Change this value ONLY for testing purposes!

Declaration

protected int chunkSize

Field Value

Type	Description
System.Int32

DefaultChunkSize

Default chunk size. Default value is 10*MB.

Declaration

public const int DefaultChunkSize = 10485760

Field Value

Type	Description
System.Int32

MinimumChunkSize

Minimum chunk size (except the last one). Default value is 256*KB.

Declaration

public const int MinimumChunkSize = 262144

Field Value

Type	Description
System.Int32

Properties

ChunkSize

Gets or sets the size of each chunk sent to the server. Chunks (except the last chunk) must be a multiple of MinimumChunkSize to be compatible with Google upload servers.

Declaration

public int ChunkSize { get; set; }

Property Value

Type	Description
System.Int32

ContentStream

Gets or sets the stream to upload.

Declaration

public Stream ContentStream { get; }

Property Value

Type	Description
System.IO.Stream

Options

Gets the options used to control the resumable upload.

Declaration

protected ResumableUploadOptions Options { get; }

Property Value

Type	Description
ResumableUploadOptions

UploadStreamInterceptor

Interceptor used to propagate data successfully uploaded on each chunk.

Declaration

public StreamInterceptor UploadStreamInterceptor { get; set; }

Property Value

Type	Description
Google.Apis.Http.StreamInterceptor

Methods

CreateFromUploadUri(Uri, Stream, ResumableUploadOptions)

Creates a ResumableUpload instance for a resumable upload session which has already been initiated.

Declaration

public static ResumableUpload CreateFromUploadUri(Uri uploadUri, Stream contentStream, ResumableUploadOptions options = null)

Parameters

Type	Name	Description
System.Uri	uploadUri	The session URI of the resumable upload session. Must not be null.
System.IO.Stream	contentStream	The data to be uploaded. Must not be null.
ResumableUploadOptions	options	The options for the upload operation. May be null.

Returns

Type	Description
ResumableUpload	The instance which can be used to upload the specified content.

Remarks

See https://cloud.google.com/storage/docs/json_api/v1/how-tos/resumable-upload#start-resumable for more information about initiating resumable upload sessions and saving the session URI, or upload URI.

ExceptionForResponseAsync(HttpResponseMessage)

Creates a GoogleApiException instance using the error response from the server.

Declaration

protected Task<GoogleApiException> ExceptionForResponseAsync(HttpResponseMessage response)

Parameters

Type	Name	Description
System.Net.Http.HttpResponseMessage	response	The error response.

Returns

Type	Description
System.Threading.Tasks.Task<GoogleApiException>	An exception which can be thrown by the caller.

GetProgress()

Get the current progress state.

Declaration

public IUploadProgress GetProgress()

Returns

Type	Description
IUploadProgress	An IUploadProgress describing the current progress of the upload.

See Also

ProgressChanged

InitiateSessionAsync(CancellationToken)

Initiates the resumable upload session and returns the session URI, or upload URI. See https://developers.google.com/drive/manage-uploads#start-resumable and https://cloud.google.com/storage/docs/json_api/v1/how-tos/resumable-upload#start-resumable for more information.

Declaration

public abstract Task<Uri> InitiateSessionAsync(CancellationToken cancellationToken = default(CancellationToken))

Parameters

Type	Name	Description
System.Threading.CancellationToken	cancellationToken	The token to monitor for cancellation requests.

Returns

Type	Description
System.Threading.Tasks.Task<System.Uri>	The task containing the session URI to use for the resumable upload.

ProcessResponse(HttpResponseMessage)

Process a response from the final upload chunk call.

Declaration

protected virtual void ProcessResponse(HttpResponseMessage httpResponse)

Parameters

Type	Name	Description
System.Net.Http.HttpResponseMessage	httpResponse	The response body from the final uploaded chunk.

Resume()

Resumes the upload from the last point it was interrupted. Use when resuming and the program was not restarted.

Declaration

public IUploadProgress Resume()

Returns

Type	Description
IUploadProgress

Resume(Uri)

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.

Declaration

public IUploadProgress Resume(Uri uploadUri)

Parameters

Type	Name	Description
System.Uri	uploadUri	VideosResource.InsertMediaUpload UploadUri property value that was saved to persistent storage during a prior execution.

Returns

Type	Description
IUploadProgress

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.

ResumeAsync()

Asynchronously resumes the upload from the last point it was interrupted.

Declaration

public Task<IUploadProgress> ResumeAsync()

Returns

Type	Description
System.Threading.Tasks.Task<IUploadProgress>

Remarks

You do not need to seek to restart point in the ContentStream file.

ResumeAsync(CancellationToken)

Asynchronously resumes the upload from the last point it was interrupted. Use when resuming and the program was not restarted.

Declaration

public Task<IUploadProgress> ResumeAsync(CancellationToken cancellationToken)

Parameters

Type	Name	Description
System.Threading.CancellationToken	cancellationToken	A cancellation token to cancel the asynchronous operation.

Returns

Type	Description
System.Threading.Tasks.Task<IUploadProgress>

Remarks

You do not need to seek to restart point in the ContentStream file.

ResumeAsync(Uri)

Asynchronously resumes the upload from the last point it was interrupted. Use when resuming and the program was restarted. Implemented only for ContentStreams where .CanSeek is True.

Declaration

public Task<IUploadProgress> ResumeAsync(Uri uploadUri)

Parameters

Type	Name	Description
System.Uri	uploadUri	VideosResource.InsertMediaUpload UploadUri property value that was saved to persistent storage during a prior execution.

Returns

Type	Description
System.Threading.Tasks.Task<IUploadProgress>

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.

ResumeAsync(Uri, CancellationToken)

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.

Declaration

public Task<IUploadProgress> ResumeAsync(Uri uploadUri, CancellationToken cancellationToken)

Parameters

Type	Name	Description
System.Uri	uploadUri	VideosResource.InsertMediaUpload UploadUri property value that was saved to persistent storage during a prior execution.
System.Threading.CancellationToken	cancellationToken	A cancellation token to cancel the asynchronous operation.

Returns

Type	Description
System.Threading.Tasks.Task<IUploadProgress>

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.

SendNextChunkAsync(Stream, CancellationToken)

Uploads the next chunk of data to the server.

Declaration

protected Task<bool> SendNextChunkAsync(Stream stream, CancellationToken cancellationToken)

Parameters

Type	Name	Description
System.IO.Stream	stream
System.Threading.CancellationToken	cancellationToken

Returns

Type	Description
System.Threading.Tasks.Task<System.Boolean>	True if the entire media has been completely uploaded.

Upload()

Uploads the content to the server. This method is synchronous and will block until the upload is completed.

Declaration

public IUploadProgress Upload()

Returns

Type	Description
IUploadProgress

Remarks

In case the upload fails the Exception will contain the exception that cause the failure.

UploadAsync()

Uploads the content asynchronously to the server.

Declaration

public Task<IUploadProgress> UploadAsync()

Returns

Type	Description
System.Threading.Tasks.Task<IUploadProgress>

UploadAsync(CancellationToken)

Uploads the content to the server using the given cancellation token.

Declaration

public Task<IUploadProgress> UploadAsync(CancellationToken cancellationToken)

Parameters

Type	Name	Description
System.Threading.CancellationToken	cancellationToken	A cancellation token to cancel operation.

Returns

Type	Description
System.Threading.Tasks.Task<IUploadProgress>

Remarks

In case the upload fails Exception will contain the exception that cause the failure. The only exception which will be thrown is System.Threading.Tasks.TaskCanceledException which indicates that the task was canceled.

Events

ProgressChanged

Event called whenever the progress of the upload changes.

Declaration

public event Action<IUploadProgress> ProgressChanged

Event Type

Type	Description
System.Action<IUploadProgress>

UploadSessionData

Event called when an UploadUri is created. Not needed if the application program will not support resuming after a program restart.

Declaration

public event Action<IUploadSessionData> UploadSessionData

Event Type

Type	Description
System.Action<IUploadSessionData>

Remarks

Within the event, persist the UploadUri to storage. It is strongly recommended that the full path filename (or other media identifier) is also stored so that it can be compared to the current open filename (media) upon restart.