public void StartConsole()
{
_cancellationTokenSource = new CancellationTokenSource();
WriteEventLogEntry("Service started.", EventLogEntryType.Information);
mail.SendMail("Audio Processor Service started."); // Send mail to notify that service started
Task.Run(
async() =>
{
CancellationToken token = _cancellationTokenSource.Token;
CheckConfig(); //Check prerequsites. (ffmpeg.exe particularly)
_speechRecognition = new SpeechRecognition(eventLog, mail, tempDirectoryPath);
while (!token.IsCancellationRequested)
{
try
{
await ProcessTask(); // An ETL Job to read from DB to update another DB
await Task.Delay(TimeSpan.FromMinutes(1), token);
}
catch (Exception ex1)
{
Elmah.CreateLogEntry(ex1, eventLog);
WriteEventLogEntry(ex1.ToString(), EventLogEntryType.Error);
mail.SendMail("Audio Processor Service Error: " + ex1.Message);
//Environment.Exit(1);
throw new InvalidOperationException("Exception in service", ex1); // this cause the service to stop with status as failed
}
}
WriteEventLogEntry("Service stopped gracefully.", EventLogEntryType.Information);
mail.SendMail("Audio Processor Service Stopped...");
//terminate = false;
});
}
/// <summary>
/// Writes to the event log, writes to ELMAH, and sends an email.
/// </summary>
/// <param name="errorMessage"></param>
/// <param name="ex"></param>
private void HandleError(string errorMessage, Exception ex)
{
WriteEventLogEntry(errorMessage + Environment.NewLine + ex?.ToString(), EventLogEntryType.Error);
if (ex != null)
{
Elmah.CreateLogEntry(ex, eventLog);
}
mail.SendMail(errorMessage + ex?.Message);
}
/// <summary>
/// watcher thread method. Here all the processing happens.
/// </summary>
public async Task ProcessTask()
{
try
{
using (var db = new trackdocEntities())
{
_speechRecognition.HandleCompleted(db);
var audioIdsToConvert = GetJobList(db);//.OrderByDescending(x => x).ToList();
var pendingSpeechRecognitionJobs = _speechRecognition.GetPendingSpeechRecJobs(db);
var pendingSpeechRecAudioIds = _speechRecognition.GetPendingSpeechRecJobIds(pendingSpeechRecognitionJobs);
var audioIdsToDownload = audioIdsToConvert.Union(pendingSpeechRecAudioIds).Distinct().OrderBy(a => a);
var audioMetadatas = GetAudioMetadatas(audioIdsToDownload, db);
foreach (var audioId in audioIdsToDownload)
{
AudioMetadata audioMetadata = null;
try
{
audioMetadata = audioMetadatas.First(a => a.audioId == audioId);
await Shared.StreamBlobToFile(connectionString, audioId, audioMetadata.UnconvertedPath, eventLog);
if (audioMetadata.OriginalAudioType == "dss" || audioMetadata.OriginalAudioType == "ds2")
{
ConvertToWav(audioMetadata);
}
if (pendingSpeechRecAudioIds.Contains(audioId))
{
var speechRecJob = pendingSpeechRecognitionJobs.First(s => s.audio_id == audioId);
_speechRecognition.InitiateSpeechRecProcessing(speechRecJob, audioMetadata.UnconvertedPath, db);
}
if (audioIdsToConvert.Contains(audioId))
{
ConvertAudio(audioMetadata, db);
}
}
catch (Exception ex)
{
SetErrorStatus(audioId);
Elmah.CreateLogEntry(ex, eventLog);
WriteEventLogEntry("Processing of audio " + audioId + " failed: " + ex.ToString(), EventLogEntryType.Error);
mail.SendMail("Error processing audio " + audioId + ": " + ex.Message);
}
finally
{
DeleteIfExists(audioMetadata?.UnconvertedPath);
DeleteIfExists(audioMetadata?.IntermediateWavPath);
DeleteIfExists(audioMetadata?.FinalPath);
}
}
}
PurgeOldAudios();
}
catch (Exception ex)
{
Elmah.CreateLogEntry(ex, eventLog);
WriteEventLogEntry(ex.ToString(), EventLogEntryType.Error);
mail.SendMail("Audio Processor Service Error: " + ex.Message);
}
}