private BsonDocument GetDocument(CloudTwin twin)
{
var properties = twin.Properties.ToDictionary(p => p.Key, p => p.Value);
properties["_id"] = twin.Id;
properties["name"] = twin.Name;
return(new BsonDocument(properties));
}
public override async Task StartAsync(CancellationToken cancellationToken)
{
try
{
await Task.Delay(TimeSpan.FromSeconds(1), cancellationToken).ContinueWith(_ => { }).ConfigureAwait(false);
if (_mongoDatabaseCollection == null)
{
_messageQueue.Publish(new NotifyUserMessage("Add CloudTwin configuration to config file."));
return;
}
var cursor = await _mongoDatabaseCollection
.FindAsync(new BsonDocument(), cancellationToken : cancellationToken)
.ConfigureAwait(false);
var documents = await cursor.ToListAsync(cancellationToken).ConfigureAwait(false);
foreach (var document in documents)
{
var twin = new CloudTwin();
var dict = document.ToDictionary();
foreach (var pair in dict)
{
if (pair.Key.Equals("_id", StringComparison.Ordinal))
{
twin.Id = pair.Value as string;
}
else if (pair.Key.Equals("name", StringComparison.OrdinalIgnoreCase))
{
twin.Name = pair.Value as string;
}
else
{
twin.Properties.Add(pair);
}
}
if (!string.IsNullOrEmpty(twin.Id))
{
_devices.Add(twin);
}
}
var lastUpdate = DateTime.MinValue;
while (!cancellationToken.IsCancellationRequested)
{
try
{
var devices = _devices.OfType <CloudTwin>().Where(t => t.LastUpdate > lastUpdate).ToList();
var newLastUpdate = lastUpdate;
foreach (var twin in devices)
{
if (lastUpdate < twin.LastUpdate)
{
newLastUpdate = twin.LastUpdate;
}
var document = GetDocument(twin);
await _mongoDatabaseCollection
.ReplaceOneAsync(new BsonDocument("_id", BsonValue.Create(twin.Id)), document, cancellationToken : cancellationToken)
.ConfigureAwait(false);
}
lastUpdate = newLastUpdate;
}
catch (Exception e)
{
if (cancellationToken.IsCancellationRequested)
{
return;
}
_log.Error(e.Message, e);
}
await Task.Delay(TimeSpan.FromSeconds(10), cancellationToken).ContinueWith(_ => { }).ConfigureAwait(false);
}
}
catch (Exception e)
{
if (!cancellationToken.IsCancellationRequested)
{
_log.Error(e.Message, e);
}
}
}