298 lines
8.1 KiB
Ruby
298 lines
8.1 KiB
Ruby
# frozen_string_literal: true
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class Draft < ActiveRecord::Base
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NEW_TOPIC ||= 'new_topic'
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NEW_PRIVATE_MESSAGE ||= 'new_private_message'
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EXISTING_TOPIC ||= 'topic_'
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class OutOfSequence < StandardError; end
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def self.set(user, key, sequence, data, owner = nil, retry_not_unique: true)
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if SiteSetting.backup_drafts_to_pm_length > 0 && SiteSetting.backup_drafts_to_pm_length < data.length
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backup_draft(user, key, sequence, data)
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end
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# this is called a lot so we should micro optimize here
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draft_id, current_owner, current_sequence = DB.query_single(<<~SQL, user_id: user.id, key: key)
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WITH draft AS (
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SELECT id, owner FROM drafts
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WHERE
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user_id = :user_id AND
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draft_key = :key
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),
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draft_sequence AS (
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SELECT sequence
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FROM draft_sequences
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WHERE
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user_id = :user_id AND
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draft_key = :key
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)
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SELECT
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(SELECT id FROM draft),
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(SELECT owner FROM draft),
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(SELECT sequence FROM draft_sequence)
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SQL
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current_sequence ||= 0
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if draft_id
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if current_sequence != sequence
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raise Draft::OutOfSequence
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end
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if owner && current_owner && current_owner != owner
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sequence += 1
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DraftSequence.upsert({
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sequence: sequence,
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draft_key: key,
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user_id: user.id,
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},
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unique_by: [:user_id, :draft_key]
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)
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end
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DB.exec(<<~SQL, id: draft_id, sequence: sequence, data: data, owner: owner || current_owner)
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UPDATE drafts
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SET sequence = :sequence
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, data = :data
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, revisions = revisions + 1
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, owner = :owner
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WHERE id = :id
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SQL
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elsif sequence != current_sequence
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raise Draft::OutOfSequence
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else
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begin
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Draft.create!(
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user_id: user.id,
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draft_key: key,
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data: data,
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sequence: sequence,
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owner: owner
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)
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rescue ActiveRecord::RecordNotUnique => e
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# we need this to be fast and with minimal locking, in some cases we can have a race condition
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# around 2 controller actions calling for draft creation at the exact same time
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# to avoid complex locking and a distributed mutex, since this is so rare, simply add a single retry
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if retry_not_unique
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set(user, key, sequence, data, owenr, retry_not_unique: false)
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else
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raise e
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end
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end
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end
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sequence
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end
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def self.get(user, key, sequence)
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opts = {
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user_id: user.id,
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draft_key: key,
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sequence: sequence
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}
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current_sequence, data, draft_sequence = DB.query_single(<<~SQL, opts)
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WITH draft AS (
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SELECT data, sequence
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FROM drafts
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WHERE draft_key = :draft_key AND user_id = :user_id
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),
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draft_sequence AS (
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SELECT sequence
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FROM draft_sequences
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WHERE draft_key = :draft_key AND user_id = :user_id
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)
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SELECT
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( SELECT sequence FROM draft_sequence) ,
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( SELECT data FROM draft ),
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( SELECT sequence FROM draft )
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SQL
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current_sequence ||= 0
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if sequence != current_sequence
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raise Draft::OutOfSequence
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end
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data if current_sequence == draft_sequence
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end
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def self.clear(user, key, sequence)
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current_sequence = DraftSequence.current(user, key)
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# bad caller is a reason to complain
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if sequence != current_sequence
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raise Draft::OutOfSequence
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end
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# corrupt data is not a reason not to leave data
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Draft.where(user_id: user.id, draft_key: key).destroy_all
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end
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def self.stream(opts = nil)
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opts ||= {}
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user_id = opts[:user].id
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offset = (opts[:offset] || 0).to_i
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limit = (opts[:limit] || 30).to_i
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# JOIN of topics table based on manipulating draft_key seems imperfect
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builder = DB.build <<~SQL
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SELECT
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d.*, t.title, t.id topic_id, t.archetype,
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t.category_id, t.closed topic_closed, t.archived topic_archived,
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pu.username, pu.name, pu.id user_id, pu.uploaded_avatar_id, pu.username_lower,
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du.username draft_username, NULL as raw, NULL as cooked, NULL as post_number
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FROM drafts d
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LEFT JOIN LATERAL json_extract_path_text (d.data::json, 'postId') postId ON TRUE
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LEFT JOIN posts p ON postId :: BIGINT = p.id
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LEFT JOIN topics t ON
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CASE
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WHEN d.draft_key LIKE '%' || '#{EXISTING_TOPIC}' || '%'
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THEN CAST(replace(d.draft_key, '#{EXISTING_TOPIC}', '') AS INT)
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ELSE 0
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END = t.id
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JOIN users pu on pu.id = COALESCE(p.user_id, t.user_id, d.user_id)
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JOIN users du on du.id = #{user_id}
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/*where*/
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/*order_by*/
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/*offset*/
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/*limit*/
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SQL
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builder
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.where('d.user_id = :user_id', user_id: user_id.to_i)
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.order_by('d.updated_at desc')
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.offset(offset)
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.limit(limit)
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.query
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end
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def self.cleanup!
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DB.exec(<<~SQL)
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DELETE FROM drafts
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WHERE sequence < (
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SELECT MAX(s.sequence)
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FROM draft_sequences s
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WHERE s.draft_key = drafts.draft_key
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AND s.user_id = drafts.user_id
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)
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SQL
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# remove old drafts
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delete_drafts_older_than_n_days = SiteSetting.delete_drafts_older_than_n_days.days.ago
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Draft.where("updated_at < ?", delete_drafts_older_than_n_days).destroy_all
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end
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def self.backup_draft(user, key, sequence, data)
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reply = JSON.parse(data)["reply"] || ""
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return if reply.length < SiteSetting.backup_drafts_to_pm_length
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post_id = BackupDraftPost.where(user_id: user.id, key: key).pluck_first(:post_id)
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post = Post.where(id: post_id).first if post_id
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if post_id && !post
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BackupDraftPost.where(user_id: user.id, key: key).delete_all
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end
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indented_reply = reply.split("\n").map! do |l|
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" #{l}"
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end
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draft_body = <<~MD
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#{indented_reply.join("\n")}
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```text
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seq: #{sequence}
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key: #{key}
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```
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MD
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return if post && post.raw == draft_body
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if !post
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topic = ensure_draft_topic!(user)
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Post.transaction do
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post = PostCreator.new(
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user,
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raw: draft_body,
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skip_jobs: true,
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skip_validations: true,
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topic_id: topic.id,
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).create
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BackupDraftPost.create!(user_id: user.id, key: key, post_id: post.id)
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end
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elsif post.last_version_at > 5.minutes.ago
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# bypass all validations here to maximize speed
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post.update_columns(
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raw: draft_body,
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cooked: PrettyText.cook(draft_body),
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updated_at: Time.zone.now
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)
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else
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revisor = PostRevisor.new(post, post.topic)
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revisor.revise!(user, { raw: draft_body },
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bypass_bump: true,
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skip_validations: true,
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skip_staff_log: true,
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bypass_rate_limiter: true
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)
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end
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rescue => e
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Discourse.warn_exception(e, message: "Failed to backup draft")
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end
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def self.ensure_draft_topic!(user)
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topic_id = BackupDraftTopic.where(user_id: user.id).pluck_first(:topic_id)
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topic = Topic.find_by(id: topic_id) if topic_id
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if topic_id && !topic
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BackupDraftTopic.where(user_id: user.id).delete_all
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end
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if !topic
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Topic.transaction do
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creator = PostCreator.new(
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user,
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title: I18n.t("draft_backup.pm_title"),
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archetype: Archetype.private_message,
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raw: I18n.t("draft_backup.pm_body"),
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skip_jobs: true,
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skip_validations: true,
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target_usernames: user.username
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)
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topic = creator.create.topic
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BackupDraftTopic.create!(topic_id: topic.id, user_id: user.id)
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end
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end
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topic
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end
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end
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# == Schema Information
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#
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# Table name: drafts
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#
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# id :integer not null, primary key
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# user_id :integer not null
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# draft_key :string not null
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# data :text not null
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# created_at :datetime not null
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# updated_at :datetime not null
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# sequence :integer default(0), not null
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# revisions :integer default(1), not null
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# owner :string
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#
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# Indexes
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#
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# index_drafts_on_user_id_and_draft_key (user_id,draft_key) UNIQUE
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#
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