Add parent CiService class for easy add of new services

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/project_services/ci_service.rb

+# Base class for CI services
+# List methods you need to implement to get your CI service
+# working with GitLab Merge Requests
+class CiService < Service
+  def category
+    :ci
+  end
+
+  # Return complete url to build page
+  #
+  # Ex.
+  #   http://jenkins.example.com:8888/job/test1/scm/bySHA1/12d65c
+  #
+  def build_page(sha)
+    # implement inside child
+  end
+
+  # Return string with build status or :error symbol
+  #
+  # Allowed states: 'success', 'failed', 'running', 'pending'
+  #
+  #
+  # Ex.
+  #   @service.commit_status('13be4ac')
+  #   # => 'success'
+  #
+  #   @service.commit_status('2abe4ac')
+  #   # => 'running'
+  #
+  #
+  def commit_status(sha)
+    # implement inside child
+  end
+end

app/models/project_services/gitlab_ci_service.rb

@@ -17,7 +17,7 @@
 #  api_key     :string(255)
 #
 
-class GitlabCiService < Service
+class GitlabCiService < CiService
   attr_accessible :project_url
 
   validates :project_url, presence: true, if: :activated?

app/models/project_services/jenkins_service.rb

@@ -17,7 +17,7 @@
 #  api_key     :string(255)
 #
 
-class JenkinsService < Service
+class JenkinsService < CiService
   attr_accessible :project_url
 
   validates :project_url, presence: true, if: :activated?
@@ -55,7 +55,7 @@ class JenkinsService < Service
   end
 
   def commit_status sha
-    response = HTTParty.get(commit_status_path(sha), verify: false)
+    response = HTTParty.get(build_page(sha), verify: false)
 
     if response.code == 200
       if response.include?('alt="Success"')
@@ -71,8 +71,4 @@ class JenkinsService < Service
       :error
     end
   end
-
-  def commit_status_path sha
-    project_url + "/job/test1/scm/bySHA1/#{sha}"
-  end
 end

app/models/service.rb

@@ -33,6 +33,10 @@ class Service < ActiveRecord::Base
     active
   end
 
+  def category
+    :common
+  end
+
   def title
     # implement inside child
   end