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Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/services/sessions/assert_user_concurrent.rb

@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+module Sessions
+  class AssertUserConcurrent
+    ERROR_CODE = "user_concurrent_stream"
+
+    def self.with_lock(session, action: "start")
+      new(session, action: action).with_lock { yield }
+    end
+
+    def initialize(session, action: "start")
+      @session = session
+      @action = action.to_s
+    end
+
+    def with_lock
+      occupying = nil
+
+      User.transaction do
+        User.lock.find(@session.user_id) if @session.user_id.present?
+        occupying = occupying_session
+        yield if occupying.nil?
+      end
+
+      return if occupying.nil?
+
+      StreamConcurrencyViolation.record!(
+        attempted: @session,
+        occupying: occupying,
+        action: @action
+      )
+      raise Teams::EntitlementError.new(
+        I18n.t("api.errors.user_concurrent_stream"),
+        code: ERROR_CODE
+      )
+    end
+
+    private
+
+    def occupying_session
+      return if @session.user_id.blank?
+
+      StreamSession.broadcasting
+                   .where(user_id: @session.user_id)
+                   .where.not(id: @session.id)
+                   .includes(:user, match: { team: :club })
+                   .order(Arel.sql("COALESCE(started_at, updated_at) DESC"))
+                   .first
+    end
+  end
+end