private async static Task AddImage(ImorImage imorImage, ILogger log)
{
HttpClient client = new HttpClient();
var endpoint = Environment.GetEnvironmentVariable("SparqlEndpoint");
var content = new StringContent(
JsonConvert.SerializeObject(imorImage),
Encoding.UTF8,
"application/json");
var results = await client.PostAsync(endpoint + "/images/create", content);
log.LogInformation(results.ToString());
try
{
results.EnsureSuccessStatusCode();
}
catch (Exception ex)
{
log.LogError(ex.Message);
throw ex;
}
}
public static async Task Run(
[EventGridTrigger] EventGridEvent eventGridEvent,
[Blob("{data.url}", FileAccess.Read, Connection = "imorblobstorage_STORAGE")] Stream input,
ILogger log)
{
try
{
if (input != null)
{
var createdEvent = ((JObject)eventGridEvent.Data).ToObject <StorageBlobCreatedEventData>();
var extension = Path.GetExtension(createdEvent.Url);
var encoder = GetEncoder(extension);
log.LogInformation($"C# Blob Trigger Function Processed Blob:\n Name: '{createdEvent.Url}'\n Size: {input.Length} Bytes");
if (encoder != null)
{
log.LogInformation($"Analyzing uploaded image '{createdEvent.Url}' ..");
ImageAnalysisInfo result = await AnalyzeImageAsync(createdEvent.Url, log);
log.LogInformation(" RESULT: RequestId: " + result.requestId);
log.LogInformation("Analyzing done successfully.");
log.LogInformation("Adding data to SPARQL Endpoint ..");
string imageName = Path.GetFileNameWithoutExtension(createdEvent.Url);
ImorImage imorImage = new ImorImage()
{
Uri = "http://www.semanticweb.org/ImagesOntology#" + imageName,
Description = (result.description.captions.Length > 0) ? result.description.captions[0].text : "",
Content = createdEvent.Url,
Tags = result.description.tags
};
await AddImage(imorImage, log);
log.LogInformation("Adding data to SPARQL Endpoint done successfully.");
}
else
{
log.LogError($"No encoder support for: {createdEvent.Url}");
}
}
else
{
log.LogError("No input stream.");
}
}
catch (Exception ex)
{
log.LogError(ex.Message);
throw ex;
}
}
public void InsertImage(ImorImage image)
{
var node = graph.CreateUriNode(new Uri(image.Uri));
var typeNode = graph.GetUriNode(new Uri(ImorEnum.RdfType));
var imageNode = graph.GetUriNode(new Uri(ImorEnum.Image));
var t = new Triple(node, typeNode, imageNode);
if (!string.IsNullOrEmpty(image.Description))
{
var descriptionNode = graph.GetUriNode(new Uri(ImorEnum.Description));
var descriptionTriple = new Triple(node, descriptionNode, graph.CreateLiteralNode(image.Description));
graph.Assert(descriptionTriple);
}
if (!string.IsNullOrEmpty(image.Content))
{
var contentNode = graph.GetUriNode(new Uri(ImorEnum.Content));
var contenTriple = new Triple(node, contentNode, graph.CreateLiteralNode(image.Content));
graph.Assert(contenTriple);
}
if (image.Tags.Any())
{
foreach (var tag in image.Tags)
{
var tagNode = graph.GetUriNode(new Uri(ImorEnum.GetUri(tag.Uri)));
if (tagNode != null)
{
var hasNode = graph.GetUriNode(new Uri(ImorEnum.HasA));
var tagTriple = new Triple(node, hasNode, tagNode);
graph.Assert(tagTriple);
}
}
}
graph.Assert(t);
var sw = new StringWriter(new StringBuilder(DatabaseInitializer.ontology));
graph.SaveToStream(sw, new CompressingTurtleWriter());
}
private ImorImage MapImage(string imageUri, IEnumerable <Triple> triples)
{
var imorImage = new ImorImage
{
Uri = imageUri
};
foreach (var imageProperty in triples)
{
var propertyName = ImorImage.RdfPropertiesDictionary.SingleOrDefault(x => x.Key == imageProperty.Predicate.ToString());
var properties = imorImage.GetType().GetProperties();
foreach (var property in properties)
{
if (property.Name == propertyName.Value)
{
property.SetValue(imorImage, imageProperty.Object.AsValuedNode().AsString());
}
}
}
return(imorImage);
}
