Expose ChatName objects to slash commands

Instead of only exposing a User to slash commands we now also expose the
ChatName object that the User object is retrieved from. This is
necessary for GitLab Chatops as we need for example the user ID of the
chat user.

1 files changed, 21 insertions, 0 deletions

diff --git a/app/models/chat_name.rb b/app/models/chat_name.rb
index f321db75eeb..fbd0f123341 100644
--- a/app/models/chat_name.rb
+++ b/app/models/chat_name.rb
@@ -1,4 +1,6 @@
 class ChatName < ActiveRecord::Base
+  LAST_USED_AT_INTERVAL = 1.hour
+
   belongs_to :service
   belongs_to :user
 
@@ -9,4 +11,23 @@ class ChatName < ActiveRecord::Base
 
   validates :user_id, uniqueness: { scope: [:service_id] }
   validates :chat_id, uniqueness: { scope: [:service_id, :team_id] }
+
+  # Updates the "last_used_timestamp" but only if it wasn't already updated
+  # recently.
+  #
+  # The throttling this method uses is put in place to ensure that high chat
+  # traffic doesn't result in many UPDATE queries being performed.
+  def update_last_used_at
+    return unless update_last_used_at?
+
+    obtained = Gitlab::ExclusiveLease
+      .new("chat_name/last_used_at/#{id}", timeout: LAST_USED_AT_INTERVAL.to_i)
+      .try_obtain
+
+    touch(:last_used_at) if obtained
+  end
+
+  def update_last_used_at?
+    last_used_at.nil? || last_used_at > LAST_USED_AT_INTERVAL.ago
+  end
 end