MergeRequest services for create, update, close and reopen

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

app/services/merge_requests/base_service.rb

+module MergeRequests
+  class BaseService < ::BaseService
+
+    private
+
+    def create_note(merge_request)
+      Note.create_status_change_note(merge_request, merge_request.target_project, current_user, merge_request.state, nil)
+    end
+
+    def execute_hooks(merge_request)
+      if merge_request.project
+        merge_request.project.execute_hooks(merge_request.to_hook_data, :merge_request_hooks)
+      end
+    end
+  end
+end

app/services/merge_requests/close_service.rb

+module MergeRequests
+  class CloseService < MergeRequests::BaseService
+    def execute(merge_request, commit = nil)
+      # If we close MergeRequest we want to ignore validation
+      # so we can close broken one (Ex. fork project removed)
+      merge_request.allow_broken = true
+
+      if merge_request.close
+        event_service.close_mr(merge_request, current_user)
+        notification_service.close_mr(merge_request, current_user)
+        create_note(merge_request)
+        execute_hooks(merge_request)
+      end
+
+      merge_request
+    end
+  end
+end

app/services/merge_requests/create_service.rb

+module MergeReques
+  class CreateService < MergeRequests::BaseService
+    def execute
+      merge_request = MergeRequest.new(params)
+      merge_request.source_project = project
+      merge_request.author = current_user
+
+      if merge_request.save
+        event_service.open_mr(merge_request, current_user)
+        notification_service.new_merge_request(merge_request, current_user)
+        merge_request.create_cross_references!(merge_request.project, current_user)
+        execute_hooks(merge_request)
+      end
+
+      merge_request
+    end
+  end
+end

app/services/merge_requests/reopen_service.rb

+module MergeRequests
+  class ReopenService < MergeRequests::BaseService
+    def execute(merge_request)
+      if merge_request.reopen
+        event_service.reopen_mr(merge_request, current_user)
+        create_note(merge_request)
+        execute_hooks(merge_request)
+        merge_request.reload_code
+        merge_request.mark_as_unchecked
+      end
+
+      merge_request
+    end
+  end
+end

app/services/merge_requests/update_service.rb

+module MergeRequests
+  class UpdateService < MergeRequests::BaseService
+    def execute(merge_request)
+      # We dont allow change of source/target projects
+      # after merge request was created
+      params.delete(:source_project_id)
+      params.delete(:target_project_id)
+
+      state = params.delete('state_event')
+
+      case state
+      when 'reopen'
+        MergeRequests::ReopenService.new(project, current_user, {}).execute(merge_request)
+      when 'close'
+        MergeRequests::CloseService.new(project, current_user, {}).execute(merge_request)
+      end
+
+      if params.present? && merge_request.update_attributes(params)
+        merge_request.reset_events_cache
+
+        if merge_request.previous_changes.include?('assignee_id')
+          notification_service.reassigned_merge_request(merge_request, current_user)
+          create_assignee_note(merge_request)
+        end
+
+        merge_request.notice_added_references(merge_request.project, current_user)
+        execute_hooks(merge_request)
+      end
+
+      merge_request
+    end
+  end
+end