/// <summary>
/// List all objects along with versions non-recursively in a bucket with a given prefix, optionally emulating a directory
/// </summary>
/// <param name="args">ListObjectsArgs Arguments Object with information like Bucket name, prefix, recursive listing, versioning</param>
/// <param name="cancellationToken">Optional cancellation token to cancel the operation</param>
/// <returns>An observable of items that client can subscribe to</returns>
public IObservable <VersionItem> ListObjectVersionsAsync(ListObjectsArgs args, CancellationToken cancellationToken = default(CancellationToken))
{
return(Observable.Create <VersionItem>(
async(obs, ct) =>
{
bool isRunning = true;
var delimiter = (args.Recursive) ? string.Empty : "/";
string marker = string.Empty;
using (var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, ct))
{
while (isRunning)
{
GetObjectListArgs goArgs = new GetObjectListArgs()
.WithBucket(args.BucketName)
.WithPrefix(args.Prefix)
.WithDelimiter(delimiter)
.WithVersions(args.Versions)
.WithMarker(marker);
Tuple <ListVersionsResult, List <VersionItem> > objectList = await this.GetObjectVersionsListAsync(goArgs, cts.Token).ConfigureAwait(false);
ListObjectVersionResponse listObjectsItemResponse = new ListObjectVersionResponse(args, objectList, obs);
marker = listObjectsItemResponse.NextMarker;
isRunning = objectList.Item1.IsTruncated;
cts.Token.ThrowIfCancellationRequested();
}
}
}));
}
/// <summary>
/// Gets the list of objects in the bucket filtered by prefix
/// </summary>
/// <param name="bucketName">Bucket to list objects from</param>
/// <param name="prefix">Filters all objects starting with a given prefix</param>
/// <param name="delimiter">Delimit the output upto this character</param>
/// <param name="marker">marks location in the iterator sequence</param>
/// <returns>Task with a tuple populated with objects</returns>
/// <param name="cancellationToken">Optional cancellation token to cancel the operation</param>
private async Task <Tuple <ListBucketResult, List <Item> > > GetObjectListAsync(string bucketName, string prefix, string delimiter, string marker, CancellationToken cancellationToken = default(CancellationToken))
{
var queryMap = new Dictionary <string, string>();
// null values are treated as empty strings.
GetObjectListArgs args = new GetObjectListArgs()
.WithBucket(bucketName)
.WithPrefix(prefix)
.WithDelimiter(delimiter)
.WithMarker(marker);
return(await this.GetObjectListAsync(args, cancellationToken));
}
/// <summary>
/// Gets the list of objects along with version IDs in the bucket filtered by prefix
/// </summary>
/// <param name="args">GetObjectListArgs Arguments Object with information like Bucket name, prefix, delimiter, marker, versions(get version IDs of the objects)</param>
/// <returns>Task with a tuple populated with objects</returns>
/// <param name="cancellationToken">Optional cancellation token to cancel the operation</param>
private async Task <Tuple <ListVersionsResult, List <VersionItem> > > GetObjectVersionsListAsync(GetObjectListArgs args, CancellationToken cancellationToken = default(CancellationToken))
{
RestRequest request = await this.CreateRequest(args).ConfigureAwait(false);
IRestResponse response = await this.ExecuteTaskAsync(this.NoErrorHandlers, request, cancellationToken).ConfigureAwait(false);
GetObjectsVersionsListResponse getObjectsListResponse = new GetObjectsVersionsListResponse(response.StatusCode, response.Content);
return(getObjectsListResponse.ObjectsTuple);
}
