public virtual void Update()
{
const int ExceptionTitleMaxLength = 64;
try
{
UpdateCore();
}
catch (Exception ex)
{
IndexerLogEntry logEntry = new IndexerLogEntry()
{
Title = ex.Message,
Date = DateTime.UtcNow,
ExceptionDetails = ex.ToString()
};
if (logEntry.Title.Length > ExceptionTitleMaxLength)
{
logEntry.Title = logEntry.Title.Substring(0, ExceptionTitleMaxLength);
}
// Remove any new lines from the metadata, otherwise you get a 403
// back from the Azure SDK
logEntry.Title = logEntry.Title.Replace("\r", string.Empty);
logEntry.Title = logEntry.Title.Replace("\n", string.Empty);
_logWriter.Write(logEntry);
}
}
public IResultSegment <IndexerLogEntry> ReadWithoutDetails(int maximumResults, string continuationToken)
{
BlobContinuationToken blobContinuationToken = BlobContinuationTokenSerializer.Deserialize(continuationToken);
BlobResultSegment blobSegment;
try
{
blobSegment = _logsContainer.ListBlobsSegmented(
prefix: _containerDirectory,
useFlatBlobListing: true,
blobListingDetails: BlobListingDetails.Metadata,
maxResults: maximumResults,
currentToken: blobContinuationToken,
options: null,
operationContext: null);
}
catch (StorageException exception)
{
if (exception.IsNotFound())
{
return(null);
}
else
{
throw;
}
}
if (blobSegment == null)
{
return(null);
}
List <IndexerLogEntry> results = new List <IndexerLogEntry>();
// Cast from IListBlobItem to ICloudBlob is safe due to useFlatBlobListing: true above.
foreach (ICloudBlob blob in blobSegment.Results)
{
IndexerLogEntry entry = ParseEntryFromBlobMetadata(blob);
if (entry != null)
{
results.Add(entry);
}
}
string nextContinuationToken = BlobContinuationTokenSerializer.Serialize(blobSegment.ContinuationToken);
return(new ResultSegment <IndexerLogEntry>(results, nextContinuationToken));
}
public void Write(IndexerLogEntry entry)
{
if (entry == null)
{
return;
}
string logBlobName = BlobNames.GetConflictFreeDateTimeBasedBlobName(entry.Date);
entry.Id = logBlobName;
string logEntryAsJson = JsonConvert.SerializeObject(entry, JsonSerialization.Settings);
_logsContainer.CreateIfNotExists();
CloudBlockBlob logBlob = _logsContainer.GetBlockBlobReference(_containerDirectory + "/" + logBlobName);
logBlob.Metadata[BlobLogEntryKeys.TitleKey] = entry.Title;
logBlob.Metadata[BlobLogEntryKeys.LogDate] = entry.Date.ToString(CultureInfo.InvariantCulture);
logBlob.UploadText(logEntryAsJson);
}
/// <summary>
/// Creates a log entry without details by only using information
/// available on the blob itself, without looking at the content
/// </summary>
/// <param name="blob">The blob to parse</param>
/// <returns>A log entry or null</returns>
private IndexerLogEntry ParseEntryFromBlobMetadata(ICloudBlob blob)
{
if (blob == null ||
!blob.Metadata.ContainsKey(BlobLogEntryKeys.LogDate) ||
!blob.Metadata.ContainsKey(BlobLogEntryKeys.TitleKey))
{
return(null);
}
IndexerLogEntry entry = new IndexerLogEntry();
entry.Id = blob.Name;
if (_containerDirectory.Length != 0 && _containerDirectory.Length < entry.Id.Length)
{
entry.Id = entry.Id.Substring(_containerDirectory.Length + 1);
}
entry.Date = DateTime.Parse(blob.Metadata[BlobLogEntryKeys.LogDate]);
entry.Title = blob.Metadata[BlobLogEntryKeys.TitleKey];
return(entry);
}
public void Write(IndexerLogEntry entry)
{
if (entry == null)
{
return;
}
string logBlobName = BlobNames.GetConflictFreeDateTimeBasedBlobName(entry.Date);
entry.Id = logBlobName;
string logEntryAsJson = JsonConvert.SerializeObject(entry, JsonSerialization.Settings);
_logsContainer.CreateIfNotExists();
CloudBlockBlob logBlob = _logsContainer.GetBlockBlobReference(_containerDirectory + "/" + logBlobName);
logBlob.Metadata[BlobLogEntryKeys.TitleKey] = entry.Title;
logBlob.Metadata[BlobLogEntryKeys.LogDate] = entry.Date.ToString(CultureInfo.InvariantCulture);
logBlob.UploadText(logEntryAsJson);
}
/// <summary>
/// Creates a log entry without details by only using information
/// available on the blob itself, without looking at the content
/// </summary>
/// <param name="blob">The blob to parse</param>
/// <returns>A log entry or null</returns>
private IndexerLogEntry ParseEntryFromBlobMetadata(ICloudBlob blob)
{
if (blob == null ||
!blob.Metadata.ContainsKey(BlobLogEntryKeys.LogDate) ||
!blob.Metadata.ContainsKey(BlobLogEntryKeys.TitleKey))
{
return null;
}
IndexerLogEntry entry = new IndexerLogEntry();
entry.Id = blob.Name;
if (_containerDirectory.Length != 0 && _containerDirectory.Length < entry.Id.Length)
{
entry.Id = entry.Id.Substring(_containerDirectory.Length + 1);
}
entry.Date = DateTime.Parse(blob.Metadata[BlobLogEntryKeys.LogDate], CultureInfo.InvariantCulture);
entry.Title = blob.Metadata[BlobLogEntryKeys.TitleKey];
return entry;
}