use breakers for MVI

config/initializers/breakers.rb

@@ -7,6 +7,8 @@
 require 'evss/common_service'
 require 'evss/documents_service'
 
+require 'mvi/service'
+
 # Read the redis config, create a connection and a namespace for breakers
 redis_config = Rails.application.config_for(:redis).freeze
 redis = Redis.new(redis_config['redis'])
@@ -17,7 +19,8 @@
   SM::Configuration.instance.breakers_service,
   EVSS::ClaimsService.breakers_service,
   EVSS::CommonService.breakers_service,
-  EVSS::DocumentsService.breakers_service
+  EVSS::DocumentsService.breakers_service,
+  MVI::Service.breakers_service
 ]
 
 plugin = Breakers::StatsdPlugin.new

lib/mvi/service.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 require 'savon'
+require 'mvi/settings'
 require_relative 'responses/find_candidate'
 
 module MVI
@@ -49,10 +50,26 @@ def find_candidate(message)
       raise MVI::ServiceError, 'MVI connection failed'
     end
 
+    def self.breakers_service
+      path = URI.parse(options[:url]).path
+      host = URI.parse(options[:url]).host
+      matcher = proc do |request_env|
+        request_env.url.host == host && request_env.url.path =~ /^#{path}/
+      end
+
+      @service = Breakers::Service.new(
+        name: 'MVI',
+        request_matcher: matcher
+      )
+    end
+
     private
 
     def connection
-      @conn ||= Faraday.new(MVI::Service.options)
+      @conn ||= Faraday.new(MVI::Service.options) do |conn|
+        conn.use :breakers
+        conn.adapter Faraday.default_adapter
+      end
     end
 
     def call(operation, body)

config/initializers/mvi_settings.rb → lib/mvi/settings.rb

@@ -5,16 +5,20 @@ module Settings
     SSL_CERT = begin
       OpenSSL::X509::Certificate.new(File.read(ENV['MVI_CLIENT_CERT_PATH']))
     rescue => e
+      # :nocov:
       Rails.logger.warn "Could not load MVI SSL cert: #{e.message}"
       raise e if Rails.env.production?
       nil
+      # :nocov:
     end
     SSL_KEY = begin
       OpenSSL::PKey::RSA.new(File.read(ENV['MVI_CLIENT_KEY_PATH']))
     rescue => e
+      # :nocov:
       Rails.logger.warn "Could not load MVI SSL key: #{e.message}"
       raise e if Rails.env.production?
       nil
+      # :nocov:
     end
   end
 end

spec/lib/mvi/service_spec.rb

@@ -121,6 +121,13 @@
           expect { subject.find_candidate(message) }.to raise_error(MVI::RecordNotFound)
         end
       end
+
+      context 'with an ongoing breakers outage' do
+        it 'returns the correct thing' do
+          MVI::Service.breakers_service.begin_forced_outage!
+          expect { subject.find_candidate(message) }.to raise_error(Breakers::OutageException)
+        end
+      end
     end
 
     context 'when MVI returns 500 but VAAFI sends 200' do