Return error when Jira REST request fails

When Jira REST request to fetch projects fails, exit early and
return the corresponding error.

app/graphql/resolvers/projects/jira_projects_resolver.rb

@@ -16,7 +16,11 @@ module Resolvers
         response, start_cursor, end_cursor = jira_projects(name: name, **compute_pagination_params(args))
         end_cursor = nil if !!response.payload[:is_last]
 
-        response.success? ? Gitlab::Graphql::ExternallyPaginatedArray.new(start_cursor, end_cursor, *response.payload[:projects]) : nil
+        if response.success?
+          Gitlab::Graphql::ExternallyPaginatedArray.new(start_cursor, end_cursor, *response.payload[:projects])
+        else
+          raise Gitlab::Graphql::Errors::BaseError, response.message
+        end
       end
 
       def authorized_resource?(project)
@@ -58,6 +62,9 @@ module Resolvers
         args = { query: name, start_at: start_at, limit: limit }.compact
 
         response = Jira::Requests::Projects.new(project.jira_service, args).execute
+
+        return [response, nil, nil] if response.error?
+
         projects = response.payload[:projects]
         start_cursor = start_at == 0 ? nil : Base64.encode64((start_at - 1).to_s)
         end_cursor = Base64.encode64((start_at + projects.size - 1).to_s)

app/services/jira/requests/base.rb

@@ -35,7 +35,7 @@ module Jira
         response = client.get(url)
         build_service_response(response)
       rescue Timeout::Error, Errno::EINVAL, Errno::ECONNRESET, Errno::ECONNREFUSED, URI::InvalidURIError, JIRA::HTTPError, OpenSSL::SSL::SSLError => error
-        error_message = error.message
+        error_message = "Jira request error: #{error.message}"
         log_error("Error sending message", client_url: client.options[:site], error: error_message)
         ServiceResponse.error(message: error_message)
       end

spec/graphql/resolvers/projects/jira_projects_resolver_spec.rb

@@ -41,22 +41,35 @@ describe Resolvers::Projects::JiraProjectsResolver do
       end
 
       context 'when user is a maintainer' do
-        include_context 'jira projects request context'
-
         before do
           project.add_maintainer(user)
         end
 
-        it 'returns jira projects' do
-          jira_projects = resolve_jira_projects
-          project_keys = jira_projects.map(&:key)
-          project_names = jira_projects.map(&:name)
-          project_ids = jira_projects.map(&:id)
+        context 'when Jira connection is valid' do
+          include_context 'jira projects request context'
+
+          it 'returns jira projects' do
+            jira_projects = resolve_jira_projects
+            project_keys = jira_projects.map(&:key)
+            project_names = jira_projects.map(&:name)
+            project_ids = jira_projects.map(&:id)
+
+            expect(jira_projects.size).to eq 2
+            expect(project_keys).to eq(%w(EX ABC))
+            expect(project_names).to eq(%w(Example Alphabetical))
+            expect(project_ids).to eq(%w(10000 10001))
+          end
+        end
+
+        context 'when Jira connection is not valid' do
+          before do
+            WebMock.stub_request(:get, 'https://jira.example.com/rest/api/2/project/search?maxResults=50&query=&startAt=0')
+              .to_raise(JIRA::HTTPError.new(double(message: 'Some failure.')))
+          end
 
-          expect(jira_projects.size).to eq 2
-          expect(project_keys).to eq(%w(EX ABC))
-          expect(project_names).to eq(%w(Example Alphabetical))
-          expect(project_ids).to eq(%w(10000 10001))
+          it 'raises failure error' do
+            expect { resolve_jira_projects }.to raise_error('Jira request error: Some failure.')
+          end
         end
       end
     end

spec/services/jira/requests/projects_spec.rb

@@ -54,7 +54,7 @@ describe Jira::Requests::Projects do
 
           it 'returns an error response' do
             expect(subject.error?).to be_truthy
-            expect(subject.message).to eq('Timeout::Error')
+            expect(subject.message).to eq('Jira request error: Timeout::Error')
           end
         end