/// <summary>
/// Main service porling task
/// </summary>
/// <param name="cancellationToken"></param>
/// <returns></returns>
private async Task ServiceProc(CancellationToken cancellationToken)
{
while (cancellationToken.IsCancellationRequested == false)
{
var now = DateTime.UtcNow;
try
{
await Task.Delay(ResolutionMilliSeconds, cancellationToken); // upload 10s each to reduce request count to Azure.
var http = WebRequest.Create($"{SEC.Url}/snapshot.jpg");
http.Method = "GET";
http.ContentType = "image/jpeg";
http.Credentials = new NetworkCredential(SEC.UserName, SEC.Password);
now = DateTime.UtcNow;
var res = await http.GetResponseAsync();
using (var bin = new BinaryReader(res.GetResponseStream()))
{
var dat = new CircumstancesKeeperModel
{
Key = MakeKey(now),
EventTime = now,
ImageData = bin.ReadBytes((int)res.ContentLength),
ImageType = ".jpg",
};
lock (UploadQueue)
{
UploadQueue.Enqueue(dat);
}
}
}
catch (WebException ex)
{
var dat = new CircumstancesKeeperModel
{
Key = MakeKey(now),
EventTime = now,
ImageData = new byte[] { },
ImageType = ".ERR",
ErrorMessage = $"{ex.Message}",
};
lock (UploadQueue)
{
UploadQueue.Enqueue(dat);
}
}
catch (Exception ex)
{
eventlog($"{ex.Message} {ex.StackTrace}");
CancelHandler.Cancel();
break;
}
}
}
/// <summary>
/// Upload to Azure
/// </summary>
/// <param name="cancellationToken"></param>
/// <returns></returns>
private void UploadProc(object prm)
{
var cancellationToken = (CancellationToken)prm;
var item = new CircumstancesKeeperModel();
var waitms = 1000;
try
{
while (cancellationToken.IsCancellationRequested == false)
{
Task.Delay(waitms, cancellationToken).Wait();
lock (UploadQueue)
{
if (UploadQueue.Count > 0)
{
item = UploadQueue.Dequeue();
}
else
{
waitms = 1000;
continue;
}
}
var blobcontainer = BlobClient.GetContainerReference($"cam-{item.EventTime.ToString("yyyyMMdd")}-{SEC.Location}");
blobcontainer.CreateIfNotExists();
var fname = $"{item.Key}{item.ImageType}";
var file = blobcontainer.GetBlockBlobReference(fname);
file.Metadata["EventTime"] = item.EventTime.ToString(TimeUtil.FormatYMDHMSms);
if (item.ImageType != ".ERR")
{
file.Metadata["Length"] = item.ImageData.Length.ToString();
file.UploadFromByteArray(item.ImageData, 0, item.ImageData.Length);
}
else
{
file.Metadata["Length"] = "0";
}
waitms = 10;
#if DEBUG
eventlog($"{item.EventTime.ToString(TimeUtil.FormatYMDHMSms)} -- uploaded : {fname}");
#endif
}
}
catch (Exception ex)
{
eventlog($"{ex.Message} {ex.StackTrace}");
CancelHandler.Cancel();
}
}