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ComputerVisionAPI.cs
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/
ComputerVisionAPI.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
using AlbumImageSearch.Configuration;
using Microsoft.Azure.CognitiveServices.Vision.ComputerVision;
using Microsoft.Azure.CognitiveServices.Vision.ComputerVision.Models;
using Microsoft.Extensions.Options;
namespace AlbumImageSearch
{
public class ComputerVisionAPI
{
private ComputerVisionClient computerVisionClient;
public ComputerVisionAPI(IOptions<ComputerVisionOptions> options, HttpClient httpClient)
{
computerVisionClient = new ComputerVisionClient(new ApiKeyServiceClientCredentials(options.Value.AccessKey), httpClient, false);
computerVisionClient.Endpoint = options.Value.Endpoint;
}
public async Task<ImageAnalysis> AnalyzeImage(string url)
{
List<VisualFeatureTypes?> features = new List<VisualFeatureTypes?>()
{
VisualFeatureTypes.Tags,
VisualFeatureTypes.Description,
VisualFeatureTypes.Color,
VisualFeatureTypes.ImageType
};
ImageAnalysis? results = null;
do
{
try
{
results = await computerVisionClient.AnalyzeImageAsync(url, features);
return results;
}
catch (ComputerVisionErrorException ex)
{
if (ex.Response.Headers.ContainsKey("Retry-After"))
{
long seconds = long.Parse(ex.Response.Headers["Retry-After"].First());
await Task.Delay(TimeSpan.FromSeconds(seconds));
continue;
}
else
{
throw;
}
}
}
while (results == null);
return results;
}
}
}