mirror of
https://github.com/discourse/discourse.git
synced 2024-11-30 09:14:36 +08:00
e82e255531
### Why?
Before, all flags were static. Therefore, they were stored in class variables and serialized by SiteSerializer. Recently, we added an option for admins to add their own flags or disable existing flags. Therefore, the class variable had to be dropped because it was unsafe for a multisite environment. However, it started causing performance problems.
### Solution
When a new Flag system is used, instead of using PostActionType, we can serialize Flags and use fragment cache for performance reasons.
At the same time, we are still supporting deprecated `replace_flags` API call. When it is used, we fall back to the old solution and the admin cannot add custom flags. In a couple of months, we will be able to drop that API function and clean that code properly. However, because it may still be used, redis cache was introduced to improve performance.
To test backward compatibility you can add this code to any plugin
```ruby
replace_flags do |flag_settings|
flag_settings.add(
4,
:inappropriate,
topic_type: true,
notify_type: true,
auto_action_type: true,
)
flag_settings.add(1001, :trolling, topic_type: true, notify_type: true, auto_action_type: true)
end
```
524 lines
17 KiB
Ruby
524 lines
17 KiB
Ruby
# frozen_string_literal: true
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#
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# How a post is deleted is affected by who is performing the action.
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# this class contains the logic to delete it.
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#
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class PostDestroyer
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def self.destroy_old_hidden_posts
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Post
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.where(deleted_at: nil, hidden: true)
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.where("hidden_at < ?", 30.days.ago)
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.find_each { |post| PostDestroyer.new(Discourse.system_user, post).destroy }
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end
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def self.destroy_stubs
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context = I18n.t("remove_posts_deleted_by_author")
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# exclude deleted topics and posts that are actively flagged
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Post
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.where(deleted_at: nil, user_deleted: true)
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.where(
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"NOT EXISTS (
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SELECT 1 FROM topics t
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WHERE t.deleted_at IS NOT NULL AND
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t.id = posts.topic_id
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)",
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)
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.where("updated_at < ?", SiteSetting.delete_removed_posts_after.hours.ago)
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.where(
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"NOT EXISTS (
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SELECT 1
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FROM post_actions pa
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WHERE pa.post_id = posts.id
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AND pa.deleted_at IS NULL
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AND pa.deferred_at IS NULL
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AND pa.post_action_type_id IN (?)
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)",
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PostActionType.notify_flag_type_ids,
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)
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.find_each { |post| PostDestroyer.new(Discourse.system_user, post, context: context).destroy }
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end
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def self.delete_with_replies(performed_by, post, reviewable = nil, defer_reply_flags: true)
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reply_ids = post.reply_ids(Guardian.new(performed_by), only_replies_to_single_post: false)
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replies = Post.where(id: reply_ids.map { |r| r[:id] })
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PostDestroyer.new(performed_by, post, reviewable: reviewable).destroy
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options = { defer_flags: defer_reply_flags }
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if SiteSetting.notify_users_after_responses_deleted_on_flagged_post
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options.merge!({ reviewable: reviewable, notify_responders: true, parent_post: post })
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end
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replies.each { |reply| PostDestroyer.new(performed_by, reply, options).destroy }
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end
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def initialize(user, post, opts = {})
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@user = user
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@post = post
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@topic = post.topic || Topic.with_deleted.find_by(id: @post.topic_id)
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@opts = opts
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end
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def destroy
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payload = WebHook.generate_payload(:post, @post) if WebHook.active_web_hooks(
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:post_destroyed,
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).exists?
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is_first_post = @post.is_first_post? && @topic
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has_topic_web_hooks = is_first_post && WebHook.active_web_hooks(:topic_destroyed).exists?
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if has_topic_web_hooks
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topic_view = TopicView.new(@topic.id, Discourse.system_user, skip_staff_action: true)
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topic_payload = WebHook.generate_payload(:topic, topic_view, WebHookTopicViewSerializer)
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end
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delete_removed_posts_after =
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@opts[:delete_removed_posts_after] || SiteSetting.delete_removed_posts_after
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if delete_removed_posts_after < 1 || post_is_reviewable? ||
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Guardian.new(@user).can_moderate_topic?(@topic) || permanent?
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perform_delete
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elsif @user.id == @post.user_id
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mark_for_deletion(delete_removed_posts_after)
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end
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UserActionManager.post_destroyed(@post)
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DiscourseEvent.trigger(:post_destroyed, @post, @opts, @user)
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WebHook.enqueue_post_hooks(:post_destroyed, @post, payload)
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Jobs.enqueue(:sync_topic_user_bookmarked, topic_id: @topic.id) if @topic
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if is_first_post
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UserProfile.remove_featured_topic_from_all_profiles(@topic)
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UserActionManager.topic_destroyed(@topic)
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DiscourseEvent.trigger(:topic_destroyed, @topic, @user)
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WebHook.enqueue_topic_hooks(:topic_destroyed, @topic, topic_payload) if has_topic_web_hooks
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if SiteSetting.tos_topic_id == @topic.id || SiteSetting.privacy_topic_id == @topic.id
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Discourse.clear_urls!
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end
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end
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end
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def recover
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if (post_is_reviewable? || Guardian.new(@user).can_moderate_topic?(@post.topic)) &&
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@post.deleted_at
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staff_recovered
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elsif @user.staff? || @user.id == @post.user_id
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user_recovered
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end
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@topic.update_column(:user_id, Discourse::SYSTEM_USER_ID) if !@topic.user_id
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@topic.recover!(@user) if @post.is_first_post?
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@topic.update_statistics
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Topic.publish_stats_to_clients!(@topic.id, :recovered)
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UserActionManager.post_created(@post)
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DiscourseEvent.trigger(:post_recovered, @post, @opts, @user)
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Jobs.enqueue(:sync_topic_user_bookmarked, topic_id: @topic.id) if @topic
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Jobs.enqueue(:notify_mailing_list_subscribers, post_id: @post.id)
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if @post.is_first_post?
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UserActionManager.topic_created(@topic)
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DiscourseEvent.trigger(:topic_recovered, @topic, @user)
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if @user.id != @post.user_id
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StaffActionLogger.new(@user).log_topic_delete_recover(
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@topic,
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"recover_topic",
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@opts.slice(:context),
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)
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end
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update_imap_sync(@post, false)
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if SiteSetting.tos_topic_id == @topic.id || SiteSetting.privacy_topic_id == @topic.id
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Discourse.clear_urls!
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end
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end
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end
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def staff_recovered
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new_post_attrs = { user_deleted: false }
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new_post_attrs[:user_id] = Discourse::SYSTEM_USER_ID if !@post.user_id
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@post.update_columns(new_post_attrs)
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@post.recover!
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mark_topic_changed
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if @post.topic && !@post.topic.private_message?
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if author = @post.user
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if @post.is_first_post?
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author.user_stat.topic_count += 1
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else
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author.user_stat.post_count += 1
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end
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author.user_stat.save!
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end
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if @post.is_first_post?
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# Update stats of all people who replied
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update_post_counts(:increment)
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end
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end
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# skip also publishing topic stats because they weren't updated yet
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@post.publish_change_to_clients! :recovered, { skip_topic_stats: true }
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TopicTrackingState.publish_recover(@post.topic) if @post.topic && @post.is_first_post?
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end
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# When a post is properly deleted. Well, it's still soft deleted, but it will no longer
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# show up in the topic
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# Permanent option allows to hard delete.
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def perform_delete
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# All posts in the topic must be force deleted if the first is force
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# deleted (except @post which is destroyed by current instance).
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if @topic && @post.is_first_post? && permanent?
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@topic.ordered_posts.with_deleted.reverse_order.find_each do |post|
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PostDestroyer.new(@user, post, @opts).destroy if post.id != @post.id
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end
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end
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Post.transaction do
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permanent? ? @post.destroy! : @post.trash!(@user)
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if @post.topic
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make_previous_post_the_last_one
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mark_topic_changed
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clear_user_posted_flag
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end
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Topic.reset_highest(@post.topic_id)
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trash_public_post_actions
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trash_revisions
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trash_user_actions
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remove_associated_replies
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remove_associated_notifications
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if @user.id != @post.user_id && !@opts[:skip_staff_log]
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if @post.topic && @post.is_first_post?
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StaffActionLogger.new(@user).log_topic_delete_recover(
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@post.topic,
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permanent? ? "delete_topic_permanently" : "delete_topic",
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@opts.slice(:context),
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)
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else
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StaffActionLogger.new(@user).log_post_deletion(
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@post,
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**@opts.slice(:context),
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permanent: permanent?,
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)
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end
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end
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if @topic && @post.is_first_post?
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permanent? ? @topic.destroy! : @topic.trash!(@user)
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PublishedPage.unpublish!(@user, @topic) if @topic.published_page
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end
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TopicLink.where(link_post_id: @post.id).destroy_all
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update_associated_category_latest_topic
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update_user_counts if !permanent?
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TopicUser.update_post_action_cache(post_id: @post.id)
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if permanent?
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if @post.topic && @post.is_first_post?
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UserHistory.where(topic_id: @post.topic.id).update_all(details: "(permanently deleted)")
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end
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UserHistory.where(post_id: @post.id).update_all(details: "(permanently deleted)")
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end
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DB.after_commit do
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if @opts[:reviewable]
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notify_deletion(
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@opts[:reviewable],
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{ notify_responders: @opts[:notify_responders], parent_post: @opts[:parent_post] },
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)
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if @post.reviewable_flag &&
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SiteSetting.notify_users_after_responses_deleted_on_flagged_post
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ignore(@post.reviewable_flag)
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end
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elsif reviewable = @post.reviewable_flag
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@opts[:defer_flags] ? ignore(reviewable) : agree(reviewable)
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end
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end
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end
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update_imap_sync(@post, true) if @post.topic&.deleted_at
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feature_users_in_the_topic if @post.topic
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@post.publish_change_to_clients!(permanent? ? :destroyed : :deleted) if @post.topic
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if @post.topic && @post.post_number == 1
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TopicTrackingState.send(permanent? ? :publish_destroy : :publish_delete, @post.topic)
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end
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end
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def permanent?
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@opts[:force_destroy] ||
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(@opts[:permanent] && @user == @post.user && @post.topic.private_message?)
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end
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# When a user 'deletes' their own post. We just change the text.
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def mark_for_deletion(delete_removed_posts_after = SiteSetting.delete_removed_posts_after)
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I18n.with_locale(SiteSetting.default_locale) do
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# don't call revise from within transaction, high risk of deadlock
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key =
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(
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if @post.is_first_post?
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"js.topic.deleted_by_author_simple"
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else
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"js.post.deleted_by_author_simple"
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end
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)
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@post.revise(
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@user,
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{ raw: I18n.t(key) },
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force_new_version: true,
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deleting_post: true,
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skip_validations: true,
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)
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Post.transaction do
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@post.update_column(:user_deleted, true)
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@post.topic_links.each(&:destroy)
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@post.topic.update_column(:closed, true) if @post.is_first_post?
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end
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end
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end
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def user_recovered
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return unless @post.user_deleted?
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Post.transaction do
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@post.update_column(:user_deleted, false)
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@post.skip_unique_check = true
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@post.topic.update_column(:closed, false) if @post.is_first_post?
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end
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# has internal transactions, if we nest then there are some very high risk deadlocks
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last_revision = @post.revisions.last
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if last_revision.present? && last_revision.modifications["raw"].present?
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@post.revise(@user, { raw: last_revision.modifications["raw"][0] }, force_new_version: true)
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end
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end
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private
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def post_is_reviewable?
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return true if @user.staff?
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Guardian.new(@user).can_review_topic?(@topic) && Reviewable.exists?(target: @post)
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end
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# we need topics to change if ever a post in them is deleted or created
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# this ensures users relying on this information can keep unread tracking
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# working as desired
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def mark_topic_changed
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# make this as fast as possible, can bypass everything
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DB.exec(<<~SQL, updated_at: Time.now, id: @post.topic_id)
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UPDATE topics
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SET updated_at = :updated_at
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WHERE id = :id
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SQL
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end
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def make_previous_post_the_last_one
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last_post =
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Post
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.select(:created_at, :user_id, :post_number)
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.where("topic_id = ? and id <> ?", @post.topic_id, @post.id)
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.where.not(user_id: nil)
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.where.not(post_type: Post.types[:whisper])
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.order("created_at desc")
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.first
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if last_post.present?
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topic = @post.topic
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topic.last_posted_at = last_post.created_at
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topic.last_post_user_id = last_post.user_id
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topic.highest_post_number = last_post.post_number
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# we go via save here cause we need to run hooks
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topic.save!(validate: false)
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end
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end
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def clear_user_posted_flag
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unless Post.exists?(
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["topic_id = ? and user_id = ? and id <> ?", @post.topic_id, @post.user_id, @post.id],
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)
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TopicUser.where(topic_id: @post.topic_id, user_id: @post.user_id).update_all "posted = false"
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end
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end
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def feature_users_in_the_topic
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Jobs.enqueue(:feature_topic_users, topic_id: @post.topic_id)
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end
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def post_action_type_view
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@post_action_type_view ||= PostActionTypeView.new
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end
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def trash_public_post_actions
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if public_post_actions = PostAction.publics.where(post_id: @post.id)
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public_post_actions.each { |pa| permanent? ? pa.destroy! : pa.trash!(@user) }
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return if permanent?
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@post.custom_fields["deleted_public_actions"] = public_post_actions.ids
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@post.save_custom_fields
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f = post_action_type_view.public_types.map { |k, _| ["#{k}_count", 0] }
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Post.with_deleted.where(id: @post.id).update_all(Hash[*f.flatten])
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end
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end
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def trash_revisions
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return unless permanent?
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@post.revisions.each(&:destroy!)
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end
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def agree(reviewable)
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notify_deletion(reviewable)
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result = reviewable.perform(@user, :agree_and_keep, post_was_deleted: true)
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reviewable.transition_to(result.transition_to, @user)
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end
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def ignore(reviewable)
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reviewable.perform_ignore_and_do_nothing(@user, post_was_deleted: true)
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reviewable.transition_to(:ignored, @user)
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end
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def notify_deletion(reviewable, options = {})
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return if @post.user.blank?
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allowed_user = @user.human? && @user.staff?
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return unless allowed_user && rs = reviewable.reviewable_scores.order("created_at DESC").first
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# ReviewableScore#types is a superset of PostActionType#flag_types.
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# If the reviewable score type is not on the latter, it means it's not a flag by a user and
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# must be an automated flag like `needs_approval`. There's no flag reason for these kind of types.
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flag_type = post_action_type_view.flag_types[rs.reviewable_score_type]
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return unless flag_type
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notify_responders = options[:notify_responders]
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Jobs.enqueue(
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:send_system_message,
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user_id: @post.user_id,
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message_type:
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(
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if notify_responders
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"flags_agreed_and_post_deleted_for_responders"
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else
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"flags_agreed_and_post_deleted"
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end
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),
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message_options: {
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flagged_post_raw_content: notify_responders ? options[:parent_post].raw : @post.raw,
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flagged_post_response_raw_content: @post.raw,
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url: notify_responders ? options[:parent_post].url : @post.url,
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flag_reason:
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I18n.t(
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"flag_reasons#{".responder" if notify_responders}.#{flag_type}",
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locale: SiteSetting.default_locale,
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base_path: Discourse.base_path,
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),
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},
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)
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end
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def trash_user_actions
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UserAction
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.where(target_post_id: @post.id)
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.each do |ua|
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row = {
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action_type: ua.action_type,
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user_id: ua.user_id,
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acting_user_id: ua.acting_user_id,
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target_topic_id: ua.target_topic_id,
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target_post_id: ua.target_post_id,
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}
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UserAction.remove_action!(row)
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end
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end
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def remove_associated_replies
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post_ids = PostReply.where(reply_post_id: @post.id).pluck(:post_id)
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if post_ids.present?
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PostReply.where(reply_post_id: @post.id).delete_all
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Post.where(id: post_ids).each { |p| p.update_column :reply_count, p.replies.count }
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end
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end
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def remove_associated_notifications
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Notification.where(topic_id: @post.topic_id, post_number: @post.post_number).delete_all
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end
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def update_associated_category_latest_topic
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return unless @post.topic && @post.topic.category
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if @post.id != @post.topic.category.latest_post_id &&
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!(@post.is_first_post? && @post.topic_id == @post.topic.category.latest_topic_id)
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return
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end
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@post.topic.category.update_latest
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end
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def update_user_counts
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|
author = @post.user
|
|
|
|
return unless author
|
|
|
|
author.create_user_stat if author.user_stat.nil?
|
|
|
|
if @post.created_at == author.user_stat.first_post_created_at
|
|
author.user_stat.update!(
|
|
first_post_created_at: author.posts.order("created_at ASC").first.try(:created_at),
|
|
)
|
|
end
|
|
|
|
UserStatCountUpdater.decrement!(@post)
|
|
|
|
if @post.created_at == author.last_posted_at
|
|
author.update_column(
|
|
:last_posted_at,
|
|
author.posts.order("created_at DESC").first.try(:created_at),
|
|
)
|
|
end
|
|
|
|
if @post.is_first_post? && @post.topic && !@post.topic.private_message?
|
|
# Update stats of all people who replied
|
|
update_post_counts(:decrement)
|
|
end
|
|
end
|
|
|
|
def update_imap_sync(post, sync)
|
|
return if !SiteSetting.enable_imap
|
|
incoming = IncomingEmail.find_by(post_id: post.id, topic_id: post.topic_id)
|
|
return if !incoming || !incoming.imap_uid
|
|
incoming.update(imap_sync: sync)
|
|
end
|
|
|
|
def update_post_counts(operator)
|
|
counts =
|
|
Post
|
|
.where(post_type: Post.types[:regular], topic_id: @post.topic_id)
|
|
.where("post_number > 1")
|
|
.group(:user_id)
|
|
.count
|
|
|
|
counts.each do |user_id, count|
|
|
if user_stat = UserStat.where(user_id: user_id).first
|
|
if operator == :decrement
|
|
UserStatCountUpdater.set!(
|
|
user_stat: user_stat,
|
|
count: user_stat.post_count - count,
|
|
count_column: :post_count,
|
|
)
|
|
else
|
|
UserStatCountUpdater.set!(
|
|
user_stat: user_stat,
|
|
count: user_stat.post_count + count,
|
|
count_column: :post_count,
|
|
)
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|