/// <summary>
/// Builds transmission from the file object. In the case of success adds
/// new transmission to the processing queue. No exceptions are thrown.
/// </summary>
/// <param name="file">Valid FileInfo object</param>
/// <returns>StorageTransmission object in case of success or null in case of fail</returns>
private StorageTransmission BuildTransmissionFromFile(FileInfo file)
{
try
{
string text = BuildNewFullFileNameWithSameDate(file.Name);
File.Move(file.FullName, text);
FileInfo newfile = new FileInfo(text);
StorageTransmission result = LoadTransmissionFromFileAsync(newfile).ConfigureAwait(false).GetAwaiter().GetResult();
if (LocalFileLoggerService.Default.Enabled)
{
LocalFileLoggerService.Default.Log(LocalLoggerSeverity.Info, "Telemetry", string.Format(CultureInfo.InvariantCulture, "Transmission ({0}): PersistenceStorageBase.BuildTransmissionFromFile renamed file from {1} to {2}", new object[3]
{
result,
file.Name,
newfile.Name
}));
}
result.Disposing = delegate
{
OnPeekedItemDisposed(newfile.Name);
};
peekedTransmissions.Add(newfile.Name, newfile.FullName);
return(result);
}
catch (Exception ex)
{
string message = string.Format(CultureInfo.InvariantCulture, "Failed to load an item from the storage. file: {0} Exception: {1}", new object[2]
{
file,
ex
});
CoreEventSource.Log.LogVerbose(message);
}
return(null);
}
private static async Task SaveTransmissionToFileAsync(Transmission transmission, string fileFullName)
{
try
{
using (Stream stream = File.OpenWrite(fileFullName))
{
if (LocalFileLoggerService.Default.Enabled)
{
LocalFileLoggerService.Default.Log(LocalLoggerSeverity.Info, "Telemetry", string.Format(CultureInfo.InvariantCulture, "Transmission ({0}): PersistenceStorageBase.SaveTransmissionToFileAsync to file {1}", new object[2]
{
transmission,
Path.GetFileName(fileFullName)
}));
}
await StorageTransmission.SaveAsync(transmission, stream).ConfigureAwait(false);
}
}
catch (UnauthorizedAccessException)
{
string message = $"Failed to save transmission to file. UnauthorizedAccessException. File full path: {fileFullName}";
CoreEventSource.Log.LogVerbose(message);
LocalFileLoggerService.Default.Log(LocalLoggerSeverity.Error, "Telemetry", string.Format(CultureInfo.InvariantCulture, "Transmission ({0}): PersistenceStorageBase.SaveTransmissionToFileAsync UnauthorizedAccessException", new object[1]
{
transmission
}));
throw;
}
}
/// <summary>
/// Peek all transmissions at once.
/// </summary>
/// <param name="token">Cancellation token</param>
/// <returns>List of transmissions or empty array</returns>
internal override IEnumerable <StorageTransmission> PeekAll(CancellationToken token)
{
List <StorageTransmission> list = new List <StorageTransmission>();
lock (peekLockObj)
{
foreach (FileInfo filteredFile in GetFilteredFiles())
{
token.ThrowIfCancellationRequested();
StorageTransmission storageTransmission = BuildTransmissionFromFile(filteredFile);
if (storageTransmission != null)
{
list.Add(storageTransmission);
}
}
}
if (LocalFileLoggerService.Default.Enabled)
{
LocalFileLoggerService.Default.Log(LocalLoggerSeverity.Info, "Telemetry", string.Format(CultureInfo.InvariantCulture, "PersistenceStorageBase.PeekAll peeked {0} transmissions", new object[1]
{
list.Count
}));
}
return(list);
}
/// <summary>
/// Sends a transmission and handle errors.
/// </summary>
/// <param name="transmission">The transmission to send.</param>
/// <param name="nextSendInterval">When this value returns it will hold a recommendation for when to start the next sending iteration.</param>
/// <returns>A boolean value that indicates if there was a retriable error.</returns>
protected virtual bool Send(StorageTransmission transmission, ref TimeSpan nextSendInterval)
{
Tuple <bool, TimeSpan> result = SendAsync(transmission, default(CancellationToken), nextSendInterval).ConfigureAwait(false).GetAwaiter().GetResult();
nextSendInterval = result.Item2;
return(result.Item1);
}
/// <summary>
/// Send transmissions in a loop.
/// </summary>
protected void SendLoop()
{
TimeSpan prevSendInterval = TimeSpan.Zero;
TimeSpan nextSendInterval = sendingIntervalOnNoData;
try
{
for (; !stopped; LogInterval(prevSendInterval, nextSendInterval), DelayHandler.WaitOne(nextSendInterval), prevSendInterval = nextSendInterval)
{
using (StorageTransmission storageTransmission = storage.Peek())
{
if (!stopped)
{
if (storageTransmission != null)
{
if (LocalFileLoggerService.Default.Enabled)
{
LocalFileLoggerService.Default.Log(LocalLoggerSeverity.Info, "Telemetry", string.Format(CultureInfo.InvariantCulture, "Transmission ({0}): PersistenceTransmitter.SendLoop about to send", new object[1]
{
storageTransmission
}));
}
bool flag = Send(storageTransmission, ref nextSendInterval);
if (LocalFileLoggerService.Default.Enabled)
{
LocalFileLoggerService.Default.Log(LocalLoggerSeverity.Info, "Telemetry", string.Format(CultureInfo.InvariantCulture, "Transmission ({0}): PersistenceTransmitter.SendLoop shouldRetry == {1}", new object[2]
{
storageTransmission,
flag
}));
}
if (!flag)
{
storage.Delete(storageTransmission);
}
}
else
{
nextSendInterval = sendingIntervalOnNoData;
}
continue;
}
}
break;
}
stoppedHandler.Set();
}
catch (ObjectDisposedException)
{
}
}
internal override void Delete(StorageTransmission item)
{
if (StorageFolder != null)
{
filesToDelete[item.FileName] = item.FullFilePath;
if (LocalFileLoggerService.Default.Enabled)
{
LocalFileLoggerService.Default.Log(LocalLoggerSeverity.Info, "Telemetry", string.Format(CultureInfo.InvariantCulture, "Transmission ({0}): PersistenceStorageBase.Delete try to delete transmission", new object[1]
{
item
}));
}
TryRemoveFilesToDelete();
}
}
private static async Task <StorageTransmission> LoadTransmissionFromFileAsync(FileInfo file)
{
try
{
using (Stream stream = file.OpenRead())
{
return(await StorageTransmission.CreateFromStreamAsync(stream, file.FullName).ConfigureAwait(false));
}
}
catch (Exception arg)
{
string message = $"Failed to load transmission from file. File full path: {file.FullName}, Exception: {arg}";
CoreEventSource.Log.LogVerbose(message);
throw;
}
}
/// <summary>
/// Reads an item from the storage. Order is Last-In-First-Out.
/// When the Transmission is no longer needed (it was either sent or failed with a non-retriable error) it should be disposed.
/// </summary>
/// <returns></returns>
internal override StorageTransmission Peek()
{
lock (peekLockObj)
{
foreach (FileInfo filteredFile in GetFilteredFiles())
{
StorageTransmission storageTransmission = BuildTransmissionFromFile(filteredFile);
if (storageTransmission != null)
{
if (LocalFileLoggerService.Default.Enabled)
{
LocalFileLoggerService.Default.Log(LocalLoggerSeverity.Info, "Telemetry", string.Format(CultureInfo.InvariantCulture, "Transmission ({0}): PersistenceStorageBase.Peek peeked transmission", new object[1]
{
storageTransmission
}));
}
return(storageTransmission);
}
}
}
return(null);
}
internal abstract void Delete(StorageTransmission transmission);
/// <summary>
/// Sends a transmission asynchronously and handle errors.
/// </summary>
/// <param name="transmission">The transmission to send.</param>
/// <param name="token">Cancellation token</param>
/// <param name="sendInterval">Previous send interval duration</param>
/// <returns></returns>
private async Task <Tuple <bool, TimeSpan> > SendAsync(StorageTransmission transmission, CancellationToken token, TimeSpan sendInterval)
{
bool isRetryable = false;
try
{
if (transmission != null)
{
bool flag = true;
lock (hashLock)
{
flag = !setOfTransmissionHash.ContainsKey(transmission.ContentHash);
if (flag)
{
setOfTransmissionHash[transmission.ContentHash] = listOfTransmissionHash.AddLast(Tuple.Create(DateTime.UtcNow, transmission.ContentHash));
checkStaleHashCount++;
if (checkStaleHashCount >= 50)
{
CleanupStaleTransmissionHash();
checkStaleHashCount = 0;
}
}
}
if (flag)
{
await transmission.SendAsync(token).ConfigureAwait(false);
}
sendInterval = SendingInterval;
}
}
catch (WebException ex)
{
int?statusCode = GetStatusCode(ex);
sendInterval = CalculateNextInterval(statusCode, sendInterval, maxIntervalBetweenRetries);
isRetryable = IsRetryable(statusCode, ex.Status);
LocalFileLoggerService.Default.Log(LocalLoggerSeverity.Error, "Telemetry", string.Format(CultureInfo.InvariantCulture, "Transmission ({0}): PersistenceTransmitter.SendAsync WebException ({1}), isRetryable == {2}", new object[3]
{
transmission,
ex.Message,
isRetryable
}));
}
catch (Exception ex2)
{
sendInterval = CalculateNextInterval(null, sendInterval, maxIntervalBetweenRetries);
string message = string.Format(CultureInfo.InvariantCulture, "Unknown exception during sending: {0}", new object[1]
{
ex2
});
CoreEventSource.Log.LogVerbose(message);
LocalFileLoggerService.Default.Log(LocalLoggerSeverity.Error, "Telemetry", string.Format(CultureInfo.InvariantCulture, "Transmission ({0}): PersistenceTransmitter.SendAsync Exception ({1})", new object[2]
{
transmission,
ex2.Message
}));
if (ex2 is OperationCanceledException)
{
throw;
}
}
if (isRetryable)
{
lock (hashLock)
{
LinkedListNode <Tuple <DateTime, string> > value = null;
if (setOfTransmissionHash.TryGetValue(transmission.ContentHash, out value) && value != null)
{
listOfTransmissionHash.Remove(value);
setOfTransmissionHash.Remove(transmission.ContentHash);
}
}
}
return(Tuple.Create(isRetryable, sendInterval));
}
