Add response based on sentry client error raised

Add an error response for the ProjectTrackingSettingsService
based on the new Sentry::Client error that is raised.

app/models/error_tracking/project_error_tracking_setting.rb

@@ -7,6 +7,7 @@ module ErrorTracking
 
     SENTRY_API_ERROR_TYPE_MISSING_KEYS = 'missing_keys_in_sentry_response'
     SENTRY_API_ERROR_TYPE_NON_20X_RESPONSE = 'non_20x_response_from_sentry'
+    SENTRY_API_ERROR_INVALID_SIZE = 'invalid_size_of_sentry_response'
 
     API_URL_PATH_REGEXP = %r{
       \A
@@ -96,6 +97,8 @@ module ErrorTracking
       { error: e.message, error_type: SENTRY_API_ERROR_TYPE_NON_20X_RESPONSE }
     rescue Sentry::Client::MissingKeysError => e
       { error: e.message, error_type: SENTRY_API_ERROR_TYPE_MISSING_KEYS }
+    rescue Sentry::Client::ResponseInvalidSizeError => e
+      { error: e.message, error_type: SENTRY_API_ERROR_INVALID_SIZE }
     end
 
     # http://HOST/api/0/projects/ORG/PROJECT

lib/sentry/client.rb

@@ -4,7 +4,7 @@ module Sentry
   class Client
     Error = Class.new(StandardError)
     MissingKeysError = Class.new(StandardError)
-    ResponseTooBigError = Class.new(StandardError)
+    ResponseInvalidSizeError = Class.new(StandardError)
 
     attr_accessor :url, :token
 
@@ -36,7 +36,7 @@ module Sentry
     def check_valid_size(issues)
       return if valid_size?(issues)
 
-      raise Client::ResponseTooBigError, "Sentry API response is too big. Limit is #{Gitlab::Utils::DeepSize.human_default_max_size}."
+      raise Client::ResponseInvalidSizeError, "Sentry API response is too big. Limit is #{Gitlab::Utils::DeepSize.human_default_max_size}."
     end
 
     def valid_size?(issues)

spec/models/error_tracking/project_error_tracking_setting_spec.rb

@@ -208,6 +208,28 @@ describe ErrorTracking::ProjectErrorTrackingSetting do
         expect(sentry_client).to have_received(:list_issues)
       end
     end
+
+    context 'when sentry client raises Sentry::Client::ResponseInvalidSizeError' do
+      let(:sentry_client) { spy(:sentry_client) }
+      let(:error_msg) {"Sentry API response is too big. Limit is #{Gitlab::Utils::DeepSize.human_default_max_size}."}
+
+      before do
+        synchronous_reactive_cache(subject)
+
+        allow(subject).to receive(:sentry_client).and_return(sentry_client)
+        allow(sentry_client).to receive(:list_issues).with(opts)
+          .and_raise(Sentry::Client::ResponseInvalidSizeError, error_msg)
+      end
+
+      it 'returns error' do
+        expect(result).to eq(
+          error: error_msg,
+          error_type: ErrorTracking::ProjectErrorTrackingSetting::SENTRY_API_ERROR_INVALID_SIZE
+        )
+        expect(subject).to have_received(:sentry_client)
+        expect(sentry_client).to have_received(:list_issues)
+      end
+    end
   end
 
   describe '#list_sentry_projects' do