public async Task <TaskOutputPage> GetLastPageAsync(int jobId, string taskResultKey, [FromQuery] int pageSize, CancellationToken token)
{
var result = new TaskOutputPage()
{
Offset = 0, Size = 0
};
var blob = this.utilities.GetTaskOutputBlob(jobId, taskResultKey);
if (pageSize > 1024 || !await blob.ExistsAsync(null, null, token))
{
return(result);
}
if (pageSize == 0)
{
pageSize = 1000;
}
await blob.FetchAttributesAsync(null, null, null, token);
if (blob.Properties.Length == 0)
{
return(result);
}
result.Offset = blob.Properties.Length - pageSize;
if (result.Offset < 0)
{
result.Offset = 0;
}
using (MemoryStream stream = new MemoryStream(pageSize))
{
await blob.DownloadRangeToStreamAsync(stream, result.Offset, pageSize, null, null, null, token);
stream.Seek(0, SeekOrigin.Begin);
StreamReader sr = new StreamReader(stream, Encoding.UTF8);
result.Content = await sr.ReadToEndAsync();
result.Size = stream.Position;
}
return(result);
}
public async T.Task <TaskOutputPage> GetOutputPageAsync(JobType type, string taskResultKey, int pageSize, long offset, CancellationToken token)
{
if (pageSize <= 0)
{
pageSize = MaxPageSize;
}
if (pageSize > MaxPageSize)
{
pageSize = MaxPageSize;
}
var result = new TaskOutputPage()
{
Offset = offset, Size = 0
};
var blob = this.Utilities.GetJobOutputBlob(type, taskResultKey);
if (!await blob.ExistsAsync(null, null, token))
{
return(result);
}
await blob.FetchAttributesAsync();
result.Eof = blob.Metadata.TryGetValue(TaskOutputPage.EofMark, out string value) && Boolean.TryParse(value, out bool eof) && eof;
var blobLength = blob.Properties.Length;
if (blobLength == 0)
{
return(result);
}
if (offset < 0)
{
offset += blobLength;
if (offset < 0)
{
offset = 0;
}
}
result.Offset = offset;
if (blobLength <= offset)
{
return(result);
}
using (MemoryStream stream = new MemoryStream(pageSize))
{
await blob.DownloadRangeToStreamAsync(stream, offset, pageSize, null, null, null, token);
stream.Seek(0, SeekOrigin.Begin);
StreamReader sr = new StreamReader(stream, Encoding.UTF8);
result.Content = await sr.ReadToEndAsync();
result.Size = stream.Position;
}
result.Eof = result.Eof && (result.Size + result.Offset >= blobLength);
return(result);
}
