Add events for creating and deleting relationships

Co-authored-by: Rubhan Azeem <rubhan.azeem@suse.com>

src/api/app/mixins/has_relationships.rb

@@ -55,6 +55,7 @@ def remove_role(what, role)
           end
     rel = rel.where(role_id: role.id) if role
     transaction do
+      rel.map(&:create_event_before_delete)
       rel.delete_all
       write_to_backend
     end

src/api/app/models/event/relationship.rb

@@ -0,0 +1,7 @@
+module Event
+  class Relationship < Base
+    self.abstract_class = true
+    payload_keys :description, :who, :user, :group, :project, :package, :role
+    shortenable_key :description
+  end
+end

src/api/app/models/event/relationship_create.rb

@@ -0,0 +1,6 @@
+module Event
+  class RelationshipCreate < Relationship
+    self.message_bus_routing_key = 'relationship.create'
+    self.description = 'Relationship was created'
+  end
+end

src/api/app/models/event/relationship_delete.rb

@@ -0,0 +1,6 @@
+module Event
+  class RelationshipDelete < Relationship
+    self.message_bus_routing_key = 'relationship.delete'
+    self.description = 'Relationship was deleted'
+  end
+end

src/api/app/models/relationship.rb

@@ -60,6 +60,8 @@ class Relationship < ApplicationRecord
     bugowners.joins(:user).merge(User.with_email)
   }
 
+  after_create :create_event_after_create
+
   # we only care for project<->user relationships, but the cache is not *that* expensive
   # to recalculate
   after_create :discard_cache
@@ -125,6 +127,12 @@ def self.with_groups_and_roles
     with_groups_and_roles_query.pluck('groups.title', 'roles.title')
   end
 
+  def create_event_before_delete
+    return unless User.session
+
+    Event::RelationshipDelete.create(event_parameters)
+  end
+
   private
 
   class << self
@@ -158,6 +166,27 @@ def check_global_role
   def allowed_user
     raise NotFoundError, "Couldn't find user #{user.login}" if user && user.is_nobody?
   end
+
+  def create_event_after_create
+    return unless User.session
+
+    Event::RelationshipCreate.create(event_parameters)
+  end
+
+  def event_parameters
+    parameters = { who: User.session.login,
+                   user: user&.login,
+                   group: group&.title,
+                   role: role.title }
+    if package
+      parameters[:project] = package.project.name
+      parameters[:package] = package.name
+    else
+      parameters[:project] = project.name
+    end
+
+    parameters
+  end
 end
 
 # == Schema Information

src/api/spec/models/relationship_spec.rb

@@ -57,6 +57,7 @@
       end
 
       it { expect { project.store }.to change(Relationship, :count).by(1) }
+      it { expect { project.store }.to change(Event::RelationshipCreate, :count).by(1) }
     end
   end
 
@@ -96,6 +97,7 @@
       end
 
       it { expect { project.store }.to change(Relationship, :count).by(1) }
+      it { expect { project.store }.to change(Event::RelationshipCreate, :count).by(1) }
     end
   end