Remove catch/throw from UpdateDashboardService

Update specs

app/services/metrics/dashboard/update_dashboard_service.rb

@@ -4,84 +4,89 @@
 module Metrics
   module Dashboard
     class UpdateDashboardService < ::BaseService
+      include Stepable
+
       ALLOWED_FILE_TYPE = '.yml'
       USER_DASHBOARDS_DIR = ::Metrics::Dashboard::ProjectDashboardService::DASHBOARD_ROOT
 
-      # rubocop:disable Cop/BanCatchThrow
-      def execute
-        catch(:error) do
-          throw(:error, error(_(%q(You are not allowed to push into this branch. Create another branch or open a merge request.)), :forbidden)) unless push_authorized?
-
-          result = ::Files::UpdateService.new(project, current_user, dashboard_attrs).execute
-          throw(:error, result.merge(http_status: :bad_request)) unless result[:status] == :success
+      steps :check_push_authorized,
+        :check_branch_name,
+        :check_file_type,
+        :update_file
 
-          success(result.merge(http_status: :created, dashboard: dashboard_details))
-        end
+      def execute
+        execute_steps
       end
-      # rubocop:enable Cop/BanCatchThrow
 
       private
 
-      def dashboard_attrs
-        {
-          commit_message: params[:commit_message],
-          file_path: update_dashboard_path,
-          file_content: update_dashboard_content,
-          encoding: 'text',
-          branch_name: branch,
-          start_branch: repository.branch_exists?(branch) ? branch : project.default_branch
-        }
+      def check_push_authorized(result)
+        return error(_(%q(You are not allowed to push into this branch. Create another branch or open a merge request.)), :forbidden) unless push_authorized?
+
+        success(result)
       end
 
-      def dashboard_details
-        {
-          path: update_dashboard_path,
-          display_name: ::Metrics::Dashboard::ProjectDashboardService.name_for_path(update_dashboard_path),
-          default: false,
-          system_dashboard: false
-        }
+      def check_branch_name(result)
+        return error(_(%q(There was an error updating the dashboard, branch name is invalid.)), :bad_request) unless valid_branch_name?
+        return error(_('There was an error updating the dashboard, branch named: %{branch} already exists.') % { branch: params[:branch] }, :bad_request) unless new_or_default_branch?
+
+        success(result)
       end
 
-      def push_authorized?
-        Gitlab::UserAccess.new(current_user, project: project).can_push_to_branch?(branch)
+      def check_file_type(result)
+        return error(_(%q(The file name should have a .yml extension)), :bad_request) unless target_file_type_valid?
+
+        success(result)
       end
 
-      # rubocop:disable Cop/BanCatchThrow
-      def branch
-        @branch ||= begin
-          throw(:error, error(_('There was an error updating the dashboard, branch name is invalid.'), :bad_request)) unless valid_branch_name?
-          throw(:error, error(_('There was an error updating the dashboard, branch named: %{branch} already exists.') % { branch: params[:branch] }, :bad_request)) unless new_or_default_branch?
+      def update_file(result)
+        file_update_response = ::Files::UpdateService.new(project, current_user, dashboard_attrs).execute
 
-          params[:branch]
+        if file_update_response[:status] == :success
+          success(result.merge(file_update_response, http_status: :created, dashboard: dashboard_details))
+        else
+          error(file_update_response[:message], :bad_request)
         end
       end
-      # rubocop:enable Cop/BanCatchThrow
 
-      def new_or_default_branch?
-        !repository.branch_exists?(params[:branch]) || project.default_branch == params[:branch]
+      def push_authorized?
+        Gitlab::UserAccess.new(current_user, project: project).can_push_to_branch?(branch)
       end
 
       def valid_branch_name?
-        Gitlab::GitRefValidator.validate(params[:branch])
+        Gitlab::GitRefValidator.validate(branch)
       end
 
-      def update_dashboard_path
-        File.join(USER_DASHBOARDS_DIR, file_name)
+      def new_or_default_branch?
+        !repository.branch_exists?(branch) || project.default_branch == branch
       end
 
       def target_file_type_valid?
         File.extname(params[:file_name]) == ALLOWED_FILE_TYPE
       end
 
-      # rubocop:disable Cop/BanCatchThrow
+      def dashboard_attrs
+        {
+          commit_message: params[:commit_message],
+          file_path: update_dashboard_path,
+          file_content: update_dashboard_content,
+          encoding: 'text',
+          branch_name: branch,
+          start_branch: repository.branch_exists?(branch) ? branch : project.default_branch
+        }
+      end
+
+      def update_dashboard_path
+        File.join(USER_DASHBOARDS_DIR, file_name)
+      end
+
       def file_name
-        @file_name ||= begin
-          throw(:error, error(_('The file name should have a .yml extension'), :bad_request)) unless target_file_type_valid?
+        @file_name ||= File.basename(CGI.unescape(params[:file_name]))
+      end
 
-          File.basename(CGI.unescape(params[:file_name]))
-        end
+      def branch
+        @branch ||= params[:branch]
       end
-      # rubocop:enable Cop/BanCatchThrow
 
       def update_dashboard_content
         ::PerformanceMonitoring::PrometheusDashboard.from_json(params[:file_content]).to_yaml
@@ -90,6 +95,15 @@ module Metrics
       def repository
         @repository ||= project.repository
       end
+
+      def dashboard_details
+        {
+          path: update_dashboard_path,
+          display_name: ::Metrics::Dashboard::ProjectDashboardService.name_for_path(update_dashboard_path),
+          default: false,
+          system_dashboard: false
+        }
+      end
     end
   end
 end

spec/services/metrics/dashboard/update_dashboard_service_spec.rb

@@ -27,7 +27,14 @@ describe Metrics::Dashboard::UpdateDashboardService, :use_clean_rails_memory_sto
     end
 
     context 'user does not have push right to repository' do
-      it_behaves_like 'misconfigured dashboard service response', :forbidden, "You are not allowed to push into this branch. Create another branch or open a merge request."
+      it 'returns an appropriate message and status code', :aggregate_failures do
+        result = service_call
+
+        expect(result.keys).to contain_exactly(:message, :http_status, :status, :last_step)
+        expect(result[:status]).to eq(:error)
+        expect(result[:http_status]).to eq(:forbidden)
+        expect(result[:message]).to eq("You are not allowed to push into this branch. Create another branch or open a merge request.")
+      end
     end
 
     context 'with rights to push to the repository' do
@@ -39,13 +46,27 @@ describe Metrics::Dashboard::UpdateDashboardService, :use_clean_rails_memory_sto
         context 'with a yml extension' do
           let(:file_name) { 'config/prometheus/../database.yml' }
 
-          it_behaves_like 'misconfigured dashboard service response', :bad_request, "A file with this name doesn't exist"
+          it 'returns an appropriate message and status code', :aggregate_failures do
+            result = service_call
+
+            expect(result.keys).to contain_exactly(:message, :http_status, :status, :last_step)
+            expect(result[:status]).to eq(:error)
+            expect(result[:http_status]).to eq(:bad_request)
+            expect(result[:message]).to eq("A file with this name doesn't exist")
+          end
         end
 
         context 'without a yml extension' do
           let(:file_name) { '../../..../etc/passwd' }
 
-          it_behaves_like 'misconfigured dashboard service response', :bad_request, "The file name should have a .yml extension"
+          it 'returns an appropriate message and status code', :aggregate_failures do
+            result = service_call
+
+            expect(result.keys).to contain_exactly(:message, :http_status, :status, :last_step)
+            expect(result[:status]).to eq(:error)
+            expect(result[:http_status]).to eq(:bad_request)
+            expect(result[:message]).to eq("The file name should have a .yml extension")
+          end
         end
       end
 
@@ -60,7 +81,14 @@ describe Metrics::Dashboard::UpdateDashboardService, :use_clean_rails_memory_sto
           project.repository.add_branch(user, branch, 'master')
         end
 
-        it_behaves_like 'misconfigured dashboard service response', :bad_request, "There was an error updating the dashboard, branch named: existing_branch already exists."
+        it 'returns an appropriate message and status code', :aggregate_failures do
+          result = service_call
+
+          expect(result.keys).to contain_exactly(:message, :http_status, :status, :last_step)
+          expect(result[:status]).to eq(:error)
+          expect(result[:http_status]).to eq(:bad_request)
+          expect(result[:message]).to eq("There was an error updating the dashboard, branch named: existing_branch already exists.")
+        end
       end
 
       context 'Files::UpdateService success' do