// Populate the List<> with blob logs for the given prefix.
// http://blogs.msdn.com/b/windowsazurestorage/archive/2011/08/03/windows-azure-storage-logging-using-logs-to-track-storage-requests.aspx
private static async Task GetLogsWithPrefixAsync(List <ICloudBlob> selectedLogs, CloudBlobClient blobClient,
string prefix, CancellationToken cancellationToken)
{
// List the blobs using the prefix
IEnumerable <IListBlobItem> blobs = await blobClient.ListBlobsAsync(prefix,
useFlatBlobListing : true, blobListingDetails : BlobListingDetails.Metadata,
cancellationToken : cancellationToken);
// iterate through each blob and figure the start and end times in the metadata
// Type cast to IStorageBlob is safe due to useFlatBlobListing: true above.
foreach (var item in blobs)
{
ICloudBlob log = item as ICloudBlob;
if (log != null)
{
// we will exclude the file if the file does not have log entries in the interested time range.
string logType = log.Metadata[LogType];
bool hasWrites = logType.Contains("write");
if (hasWrites)
{
selectedLogs.Add(log);
}
}
}
}