Geo: Improve missing on primary failure reason

ee/lib/gitlab/geo/replication/blob_downloader.rb

@@ -162,7 +162,7 @@ module Gitlab
 
           # Check for failures
           unless response.status.success?
-            return failure_result(primary_missing_file: primary_missing_file?(response), reason: "Non-success HTTP response status code #{response.status.code}", extra_details: { status_code: response.status.code, reason: response.status.reason, url: url })
+            return non_success_response_result(response, url)
           end
 
           # Stream to temporary file on disk
@@ -237,6 +237,25 @@ module Gitlab
         def actual_checksum(file_path)
           @actual_checksum = Digest::SHA256.file(file_path).hexdigest
         end
+
+        def non_success_response_result(response, url)
+          primary_missing_file = primary_missing_file?(response)
+          reason = if primary_missing_file
+                     "The file is missing on the Geo primary site"
+                   else
+                     "Non-success HTTP response status code #{response.status.code}"
+                   end
+
+          failure_result(
+            primary_missing_file: primary_missing_file,
+            reason: reason,
+            extra_details: {
+              status_code: response.status.code,
+              reason: response.status.reason,
+              url: url
+            }
+          )
+        end
       end
     end
   end

ee/spec/lib/gitlab/geo/replication/blob_downloader_spec.rb

@@ -170,7 +170,7 @@ RSpec.describe Gitlab::Geo::Replication::BlobDownloader do
 
           result = subject.execute
 
-          expect_blob_downloader_result(result, success: false, bytes_downloaded: 0, primary_missing_file: true)
+          expect_blob_downloader_result(result, success: false, bytes_downloaded: 0, primary_missing_file: true, reason: 'The file is missing on the Geo primary site')
         end
       end
 
@@ -183,7 +183,7 @@ RSpec.describe Gitlab::Geo::Replication::BlobDownloader do
 
           result = subject.execute
 
-          expect_blob_downloader_result(result, success: false, bytes_downloaded: 0, primary_missing_file: false)
+          expect_blob_downloader_result(result, success: false, bytes_downloaded: 0, primary_missing_file: false, reason: 'Non-success HTTP response status code 404')
         end
       end
     end
@@ -232,11 +232,15 @@ RSpec.describe Gitlab::Geo::Replication::BlobDownloader do
     end
   end
 
-  def expect_blob_downloader_result(result, success:, bytes_downloaded:, primary_missing_file:, extra_details: nil)
+  def expect_blob_downloader_result(result, success:, bytes_downloaded:, primary_missing_file:, reason: nil)
     expect(result.success).to eq(success)
     expect(result.bytes_downloaded).to eq(bytes_downloaded)
     expect(result.primary_missing_file).to eq(primary_missing_file)
 
+    if reason
+      expect(result.reason).to eq(reason)
+    end
+
     # Sanity check to help ensure a valid test
     expect(success).not_to be_nil
     expect(primary_missing_file).not_to be_nil