public async Task Process(ResizeMessage msg)
{
var thumbnailWidth = _options.ImageWidth;
var inputContainer = GetInputContainer(msg);
var outputContainer = GetOutputContainer(msg);
var inputBlob = inputContainer.GetBlockBlobReference(msg.Image);
var outputBlob = outputContainer.GetBlockBlobReference(msg.Image);
var encoder = GetEncoder(msg.Image);
if (null == encoder)
{
throw new NotSupportedException($"No encoder supported for {msg.Image}");
}
using (var inputStream = new MemoryStream())
using (var outputStream = new MemoryStream())
{
await inputBlob.DownloadToStreamAsync(inputStream);
inputStream.Position = 0;
using (var image = Image.Load(inputStream))
{
var divisor = image.Width / thumbnailWidth;
var height = Convert.ToInt32(Math.Round((decimal)(image.Height / divisor)));
image.Mutate(x => x.Resize(thumbnailWidth, height));
image.Save(outputStream, encoder);
outputStream.Position = 0;
}
await outputBlob.UploadFromStreamAsync(outputStream);
}
}
public static void Run([ServiceBusTrigger("thumbnails", Connection = "ServiceBusConnectionString")] ResizeMessage msg,
ILogger log, ExecutionContext context)
{
_context = context;
try
{
ServiceProvider.GetRequiredService <ImageProcessor>().Process(msg).GetAwaiter().GetResult();
}
catch (Exception ex)
{
log.LogInformation(ex.Message);
}
log.LogInformation($"Function processed: {msg}");
}
private CloudBlobContainer GetOutputContainer(ResizeMessage msg)
{
var account = CloudStorageAccount.Parse(_options.StorageAccountConnectionString);
var blobClient = account.CreateCloudBlobClient();
var container = blobClient.GetContainerReference(msg.ThumbnailContainer);
if (!_outputContainerCreated)
{
lock (_mySyncRoot)
{
if (!_outputContainerCreated)
{
container.CreateIfNotExistsAsync(BlobContainerPublicAccessType.Blob, null, null).GetAwaiter().GetResult();
_outputContainerCreated = true;
}
}
}
return(container);
}
