Close live connections from the model on any password change

The sessions end wherever the password changes, but only the profile
page closed the live connections, so a change from a console left a
signed-out device receiving messages until it dropped. Close them after
commit from User, logging rather than failing if the realtime service
can't be reached, since the password is saved by then.

From #371.

(cherry picked from commit c6e0105491)

app/controllers/users/profiles_controller.rb

@@ -8,8 +8,6 @@ class Users::ProfilesController < ApplicationController
 
   def update
     @user.update user_params
-    disconnect_remote_connections if @user.saved_change_to_password_digest?
-
     redirect_to user_profile_url, notice: update_notice
   end
 

app/models/user.rb

@@ -21,6 +21,7 @@ class User < ApplicationRecord
 
   after_create_commit :grant_membership_to_open_rooms
   after_update :sign_out_other_sessions, if: :saved_change_to_password_digest?
+  after_update_commit :disconnect_signed_out_sessions, if: :saved_change_to_password_digest?
 
   scope :ordered, -> { order("LOWER(name)") }
   scope :filtered_by, ->(query) { where("name like ?", "%#{query}%") }
@@ -57,6 +58,14 @@ class User < ApplicationRecord
       sessions.excluding(Current.session).delete_all
     end
 
+    # After commit, so a connection that drops can't come back on a session that's still there. The password is
+    # saved by then, so a realtime service that can't be reached mustn't fail the change.
+    def disconnect_signed_out_sessions
+      reset_remote_connections
+    rescue => error
+      Rails.logger.warn "Could not disconnect remote connections after a password change: #{error.class}"
+    end
+
     # One statement, which SQLite runs under the write lock, so no room is closed between reading the open ones and
     # inserting. A room that Room#destroy_later closes is either closed before, and skipped, or after, and takes this
     # membership away with the others. A room that granted itself to every user when it was created is skipped too,

test/models/user_test.rb

@@ -50,6 +50,14 @@ class UserTest < ActiveSupport::TestCase
     end
   end
 
+  test "changing the password outside a request closes the account's live connections" do
+    remote_connections = mock
+    remote_connections.expects(:disconnect).with(reconnect: true)
+    ActionCable.server.stubs(:remote_connections).returns(mock.tap { |m| m.expects(:where).with(current_user: users(:david)).returns(remote_connections) })
+
+    users(:david).update!(password: "a new secret123456")
+  end
+
   test "changing the password keeps the session it was changed from" do
     Current.session = users(:david).sessions.start!(user_agent: "This device", ip_address: "127.0.0.1")
 
@@ -59,6 +67,8 @@ class UserTest < ActiveSupport::TestCase
   end
 
   test "changing other details keeps every session" do
+    ActionCable.server.expects(:remote_connections).never
+
     assert_no_changes -> { users(:david).sessions.count } do
       users(:david).update!(name: "Dave", email_address: "dave@37signals.com")
     end