Improved code styling and added a HTTParty rescue block

lib/gitlab/prometheus.rb

@@ -54,6 +54,8 @@ module Gitlab
       raise PrometheusError, "Can't connect to #{url}"
     rescue OpenSSL::SSL::SSLError
       raise PrometheusError, "#{url} contains invalid SSL data"
+    rescue HTTParty::Error
+      raise PrometheusError, "An error has ocurred"
     end
 
     def handle_response(response)

spec/lib/gitlab/prometheus_spec.rb

@@ -49,21 +49,33 @@ describe Gitlab::Prometheus, lib: true do
     end
   end
 
-  describe 'failure to reach a prometheus url' do
-    prometheus_invalid_url = 'https://prometheus.invalid.example.com'
+  describe 'failure to reach a provided prometheus url' do
+    let(:prometheus_url) {"https://prometheus.invalid.example.com"}
 
-    it 'raises a Gitlab::PrometheusError error when a SocketError is rescued' do
-      req_stub = stub_prometheus_request_with_socket_exception(prometheus_invalid_url)
+    context 'exceptions are raised' do
+      it 'raises a Gitlab::PrometheusError error when a SocketError is rescued' do
+        req_stub = stub_prometheus_request_with_exception(prometheus_url, SocketError)
 
-      expect { subject.send(:get, prometheus_invalid_url) }.to raise_error(Gitlab::PrometheusError, "Can't connect to #{prometheus_invalid_url}")
-      expect(req_stub).to have_been_requested
-    end
+        expect { subject.send(:get, prometheus_url) }
+          .to raise_error(Gitlab::PrometheusError, "Can't connect to #{prometheus_url}")
+        expect(req_stub).to have_been_requested
+      end
 
-    it 'raises a Gitlab::PrometheusError error when a SSLError is rescued' do
-      req_stub = stub_prometheus_request_with_ssl_exception(prometheus_invalid_url)
+      it 'raises a Gitlab::PrometheusError error when a SSLError is rescued' do
+        req_stub = stub_prometheus_request_with_exception(prometheus_url, OpenSSL::SSL::SSLError)
 
-      expect { subject.send(:get, prometheus_invalid_url) }.to raise_error(Gitlab::PrometheusError, "#{prometheus_invalid_url} contains invalid SSL data")
-      expect(req_stub).to have_been_requested
+        expect { subject.send(:get, prometheus_url) }
+          .to raise_error(Gitlab::PrometheusError, "#{prometheus_url} contains invalid SSL data")
+        expect(req_stub).to have_been_requested
+      end
+
+      it 'raises a Gitlab::PrometheusError error when a HTTParty::Error is rescued' do
+        req_stub = stub_prometheus_request_with_exception(prometheus_url, HTTParty::Error)
+
+        expect { subject.send(:get, prometheus_url) }
+          .to raise_error(Gitlab::PrometheusError, "An error has ocurred")
+        expect(req_stub).to have_been_requested
+      end
     end
   end
 

spec/models/project_services/prometheus_service_spec.rb

@@ -93,12 +93,11 @@ describe PrometheusService, models: true, caching: true do
 
     [404, 500].each do |status|
       context "when Prometheus responds with #{status}" do
-        body_response = 'QUERY_FAILED'
         before do
-          stub_all_prometheus_requests(environment.slug, status: status, body: body_response)
+          stub_all_prometheus_requests(environment.slug, status: status, body: "QUERY FAILED!")
         end
 
-        it { is_expected.to eq(success: false, result: %(#{status} - \"#{body_response}\")) }
+        it { is_expected.to eq(success: false, result: %(#{status} - "QUERY FAILED!")) }
       end
     end
   end

spec/support/prometheus_helpers.rb

@@ -33,14 +33,8 @@ module PrometheusHelpers
       })
   end
 
-  def stub_prometheus_request_with_socket_exception(url)
-    WebMock.stub_request(:get, url)
-      .to_raise(SocketError)
-  end
-
-  def stub_prometheus_request_with_ssl_exception(url)
-    WebMock.stub_request(:get, url)
-      .to_raise(OpenSSL::SSL::SSLError)
+  def stub_prometheus_request_with_exception(url, exception_type)
+    WebMock.stub_request(:get, url).to_raise(exception_type)
   end
 
   def stub_all_prometheus_requests(environment_slug, body: nil, status: 200)