Improving error reporting from appetiser

src/protagonist/Engine.Tests/Ingest/Image/Appetiser/AppetiserClientTests.cs

@@ -83,7 +83,17 @@ public async Task ProcessImage_CreatesAndRemovesRequiredDirectories()
     public async Task ProcessImage_False_IfImageProcessorCallFails()
     {
         // Arrange
-        httpHandler.SetResponse(new HttpResponseMessage(HttpStatusCode.InternalServerError));
+        var imageProcessorResponse = new AppetiserResponseErrorModel()
+        {
+            Message = "error",
+            Status = "some status"
+        };
+
+        var response = httpHandler.GetResponseMessage(JsonSerializer.Serialize(imageProcessorResponse, Settings),
+            HttpStatusCode.InternalServerError);
+        response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
+
+        httpHandler.SetResponse(response);
         var context = GetIngestionContext();
 
         // Act
@@ -93,6 +103,7 @@ public async Task ProcessImage_False_IfImageProcessorCallFails()
         httpHandler.CallsMade.Should().ContainSingle(s => s == "http://image-processor/convert");
         result.Should().BeFalse();
         context.Asset.Should().NotBeNull();
+        context.Asset.Error.Should().Be("Appetiser Error: error");
     }
 
     [Theory]

src/protagonist/Engine/Ingest/Image/Appetiser/AppetiserClient.cs

@@ -54,8 +54,19 @@ public async Task<bool> ProcessImage(IngestionContext context)
             var flags = new ImageProcessorFlags(context, GetJP2FilePath(context.AssetId, false));
             logger.LogDebug("Got flags '{Flags}' for {AssetId}", flags, context.AssetId);
             var responseModel = await CallImageProcessor(context, flags);
-            await ProcessResponse(context, responseModel, flags);
-            return true;
+
+            if (responseModel is AppetiserResponseModel successResponse)
+            {
+                await ProcessResponse(context, successResponse, flags);
+                return true;
+            }
+            else if (responseModel is AppetiserResponseErrorModel failResponse)
+            {
+                context.Asset.Error = $"Appetiser Error: {failResponse.Message}";
+                return false;
+            }
+
+            return false;
         }
         catch (Exception e)
         {
@@ -87,7 +98,7 @@ public async Task<bool> ProcessImage(IngestionContext context)
         return (dest, thumb);
     }
 
-    private async Task<AppetiserResponseModel> CallImageProcessor(IngestionContext context,
+    private async Task<IAppetiserResponse> CallImageProcessor(IngestionContext context,
         ImageProcessorFlags processorFlags)
     {
         // call tizer/appetiser
@@ -102,10 +113,18 @@ private async Task<AppetiserResponseModel> CallImageProcessor(IngestionContext c
         }
 
         using var response = await httpClient.SendAsync(request);
-        response.EnsureSuccessStatusCode();
+
+        IAppetiserResponse? responseModel;
+
+        if (response.IsSuccessStatusCode)
+        {
+            responseModel = await response.Content.ReadFromJsonAsync<AppetiserResponseModel>();
+        }
+        else
+        {
+            responseModel = await response.Content.ReadFromJsonAsync<AppetiserResponseErrorModel>();
+        }
 
-        // TODO - it's possible to get a 200 when appetiser doesn't do anything, e.g. body not understood
-        var responseModel = await response.Content.ReadFromJsonAsync<AppetiserResponseModel>();
         return responseModel;
     }
 

src/protagonist/Engine/Ingest/Image/Appetiser/Models/AppetiserResponse.cs

@@ -0,0 +1,5 @@
+namespace Engine.Ingest.Image.Appetiser;
+
+public interface IAppetiserResponse
+{
+}

src/protagonist/Engine/Ingest/Image/Appetiser/Models/AppetiserResponseErrorModel.cs

@@ -0,0 +1,10 @@
+namespace Engine.Ingest.Image.Appetiser;
+
+/// <summary>
+/// Response model for receiving error requests back from Appetiser.
+/// </summary>
+public class AppetiserResponseErrorModel : IAppetiserResponse
+{
+    public string Message { get; set; }
+    public string Status { get; set; }
+}

src/protagonist/Engine/Ingest/Image/Appetiser/AppetiserResponseModel.cs → src/protagonist/Engine/Ingest/Image/Appetiser/Models/AppetiserResponseModel.cs

@@ -3,7 +3,7 @@ namespace Engine.Ingest.Image.Appetiser;
 /// <summary>
 /// Response model for receiving requests back from Appetiser.
 /// </summary>
-public class AppetiserResponseModel
+public class AppetiserResponseModel : IAppetiserResponse
 {
     public string ImageId { get; set; }
     public string JobId { get; set; }