public static async Task Run(
[QueueTrigger("%AzureStorageConversionQueueName%", Connection = "AzureWebJobsStorage")] string message,
[SignalR(HubName = "broadcast")] IAsyncCollector <SignalRMessage> signalRMessages,
ExecutionContext context,
ILogger log)
{
var sw = new Stopwatch();
sw.Start();
log.LogInformation("Downloader triggered");
var payload = JsonConvert.DeserializeObject <QueueMessagePayload>(message);
AppInsightsClient.SetOperation(context.InvocationId.ToString(), "downloader").SetSessionId(payload.ClientId);
var video = payload.Video;
video.DownloaderInvocationId = context.InvocationId;
var cts = new CancellationTokenSource();
string videoTempPath = null;
string audioTempPath = null;
int? previousPercentage = null;
long? cliDuration = null;
bool Publish(string s)
{
if (Cancellation.Tokens.ContainsKey(video.DownloaderInvocationId))
{
video.Error = "Download cancelled";
if (!cts.IsCancellationRequested)
{
cts.Cancel();
}
return(false);
}
video.Message = s;
signalRMessages.Publish("inprogress", video); //payload.ClientId
return(true);
}
void ProgressNotifier(string s)
{
if (Cancellation.Tokens.ContainsKey(video.DownloaderInvocationId))
{
cts.Cancel();
return;
}
var m = FfmpegStatus.Match(s);
if (m.Success && TimeSpan.TryParse(m.Groups["time"].Value, CultureInfo.InvariantCulture, out var time))
{
var p = (int)Math.Floor(time.TotalMilliseconds * 100 / video.Duration.TotalMilliseconds);
if (previousPercentage == p)
{
return;
}
Publish($"{CONVERTING} ({p}%)");
previousPercentage = p;
}
}
try
{
MediaStreamInfo streamInfo = null;
if (Publish("Processing..."))
{
streamInfo = await ProcessVideo(video, log);
}
if (Publish("Downloading..."))
{
videoTempPath = await DownloadVideo(streamInfo, video, log, cts.Token);
}
if (Publish(CONVERTING))
{
var result = await ConvertToAudio(video, videoTempPath, log, ProgressNotifier, cts.Token);
cliDuration = result.Item1.RunTime.Ticks;
audioTempPath = result.Item2;
WriteId3Tag(video, audioTempPath, log);
}
if (Publish("Storing..."))
{
await UploadAudio(video, audioTempPath, log, cts.Token);
}
}
catch (TaskCanceledException ex)
{
log.LogInformation("Download cancelled");
video.Error = ex.Message;
AppInsightsClient.TrackException(ex, video.Properties);
}
catch (Exception ex)
{
log.LogError(ex, ex.Message.EscapeCurlyBraces());
video.Error = ex.Message;
AppInsightsClient.TrackException(ex, video.Properties);
}
finally
{
Cancellation.Tokens.TryRemove(video.DownloaderInvocationId, out var value);
cts.Dispose();
if (videoTempPath != null && File.Exists(videoTempPath))
{
File.Delete(videoTempPath);
}
if (audioTempPath != null && File.Exists(audioTempPath))
{
File.Delete(audioTempPath);
}
Publish(string.Empty);
AppInsightsClient.TrackEvent("Download", video.Properties,
new Dictionary <string, double>
{
{ "Video duration", video.Duration.Ticks },
{ "Function duration", sw.Elapsed.Ticks },
{ "Conversion duration", cliDuration ?? 0 },
{ "Cancelled", cts.IsCancellationRequested ? 1 : 0 }
});
}
}