public static async Task <S3Event> FunctionHandler(S3Event input, ILambdaContext context)
{
var tags = new List <Tag>();
var record = input?.Records?.FirstOrDefault();
if (record == null)
{
Console.WriteLine("Input does not contain an S3 record.");
throw new Exception();
}
record.S3.Object.Key = "skateboard_resized3.jpg";
if (!SupportedImageTypes.Contains(Path.GetExtension(record.S3.Object.Key)))
{
Console.WriteLine($"Object {record.S3.Bucket.Name}:{record.S3.Object.Key} is not a supported image type");
throw new Exception();
}
Console.WriteLine($"Looking for labels in image {record.S3.Bucket.Name}:{record.S3.Object.Key}");
AWSXRayRecorder.Instance.BeginSubsegment("RekognitionDetectLabels");
var detectResponses = await RekognitionClient.DetectLabelsAsync(new DetectLabelsRequest
{
MinConfidence = MinConfidence,
Image = new Image
{
S3Object = new Amazon.Rekognition.Model.S3Object
{
Bucket = record.S3.Bucket.Name,
Name = record.S3.Object.Key
}
}
});
AWSXRayRecorder.Instance.EndSubsegment();
foreach (var label in detectResponses.Labels)
{
if (tags.Count < 10)
{
Console.WriteLine($"\tFound Label {label.Name} with confidence {label.Confidence}");
tags.Add(new Tag {
Key = label.Name, Value = label.Confidence.ToString()
});
}
else
{
Console.WriteLine($"\tSkipped label {label.Name} with confidence {label.Confidence} because the maximum number of tags has been reached");
}
}
AWSXRayRecorder.Instance.BeginSubsegment("S3PutObjectTagging");
await S3Client.PutObjectTaggingAsync(new PutObjectTaggingRequest
{
BucketName = record.S3.Bucket.Name,
Key = record.S3.Object.Key,
Tagging = new Tagging
{
TagSet = tags
}
});
AWSXRayRecorder.Instance.EndSubsegment();
AWSXRayRecorder.Instance.BeginSubsegment("S3DeleteObjectTagging");
await S3Client.DeleteObjectTaggingAsync(new DeleteObjectTaggingRequest
{
BucketName = record.S3.Bucket.Name,
Key = record.S3.Object.Key
});
AWSXRayRecorder.Instance.EndSubsegment();
return(input);
}
