Fix Move handler queuing jobs that will fail if account is suspended (mastodon#11864)

Don't put Move handler on cooldown if it didn't run. Skip unmerging
from timelines to save unnecessary work.

Author: Gargron

app/lib/activitypub/activity/move.rb

@@ -10,10 +10,13 @@ def perform
 
     target_account = ActivityPub::FetchRemoteAccountService.new.call(target_uri)
 
-    return if target_account.nil? || !target_account.also_known_as.include?(origin_account.uri)
+    if target_account.nil? || target_account.suspended? || !target_account.also_known_as.include?(origin_account.uri)
+      unmark_as_processing!
+      return
+    end
 
     # In case for some reason we didn't have a redirect for the profile already, set it
-    origin_account.update(moved_to_account: target_account) if origin_account.moved_to_account_id.nil?
+    origin_account.update(moved_to_account: target_account)
 
     # Initiate a re-follow for each follower
     origin_account.followers.local.select(:id).find_in_batches do |follower_accounts|
@@ -40,4 +43,8 @@ def processed?
   def mark_as_processing!
     redis.setex("move_in_progress:#{@account.id}", PROCESSING_COOLDOWN, true)
   end
+
+  def unmark_as_processing!
+    redis.del("move_in_progress:#{@account.id}")
+  end
 end

app/services/unfollow_service.rb

@@ -6,9 +6,12 @@ class UnfollowService < BaseService
   # Unfollow and notify the remote user
   # @param [Account] source_account Where to unfollow from
   # @param [Account] target_account Which to unfollow
-  def call(source_account, target_account)
+  # @param [Hash] options
+  # @option [Boolean] :skip_unmerge
+  def call(source_account, target_account, options = {})
     @source_account = source_account
     @target_account = target_account
+    @options        = options
 
     unfollow! || undo_follow_request!
   end
@@ -21,9 +24,11 @@ def unfollow!
     return unless follow
 
     follow.destroy!
+
     create_notification(follow) if !@target_account.local? && @target_account.activitypub?
     create_reject_notification(follow) if @target_account.local? && !@source_account.local? && @source_account.activitypub?
-    UnmergeWorker.perform_async(@target_account.id, @source_account.id)
+    UnmergeWorker.perform_async(@target_account.id, @source_account.id) unless @options[:skip_unmerge]
+
     follow
   end
 
@@ -33,7 +38,9 @@ def undo_follow_request!
     return unless follow_request
 
     follow_request.destroy!
+
     create_notification(follow_request) unless @target_account.local?
+
     follow_request
   end
 

app/workers/unfollow_follow_worker.rb

@@ -11,7 +11,7 @@ def perform(follower_account_id, old_target_account_id, new_target_account_id)
     new_target_account = Account.find(new_target_account_id)
 
     FollowService.new.call(follower_account, new_target_account)
-    UnfollowService.new.call(follower_account, old_target_account)
+    UnfollowService.new.call(follower_account, old_target_account, skip_unmerge: true)
   rescue ActiveRecord::RecordNotFound, Mastodon::NotPermittedError
     true
   end