private async Task HandleGetInstalledPrintersAsync(RequestInstalledPrintersRefreshRequest request)
{
var db = _redis.GetDatabase();
var connectionId = await db.HashGetAsync(RedisConstants.ConnectedClients, request.SpoolerId);
if (connectionId.HasValue)
{
var spoolerClient = _printingHubContext.Clients.Client(connectionId);
await spoolerClient.RequestInstalledPrinters();
}
}
public override async Task <ActionResult <Spooler> > HandleAsync(Query request, CancellationToken cancellationToken)
{
var projectId = User.GetProjectId();
var query = _db.Spoolers.Where(x => x.Zone.ProjectId == projectId && x.Id == request.Id);
var spooler = await _mapper.ProjectTo <Spooler>(query).SingleOrDefaultAsync();
if (spooler is null)
{
return(NotFound());
}
var db = _redis.GetDatabase();
if (Request.GetTypedHeaders().CacheControl?.NoCache == true)
{
// Force update of installed printers
var subscriber = _redis.GetSubscriber();
var refreshedSubscription = await subscriber.SubscribeAsync(RedisConstants.Channels.InstalledPrintersRefreshed(spooler.Id));
var queue = RedisConstants.Queues.RequestInstalledPrintersRefreshQueue(spooler.Id);
var queueRequest = new RequestInstalledPrintersRefreshRequest()
{
SpoolerId = spooler.Id
};
await db.ListRightPushAsync(queue, JsonSerializer.Serialize(queueRequest));
await subscriber.PublishAsync(RedisConstants.Channels.JobCreated, queue);
try
{
using var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
cts.CancelAfter(5_000);
await refreshedSubscription.ReadAsync(cts.Token);
}
catch (OperationCanceledException)
{
}
finally
{
await refreshedSubscription.UnsubscribeAsync();
}
}
await QueryHelpers.GetPrintersAsync(spooler, db);
return(spooler);
}