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mastodon/app/services/remove_status_service.rb

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# frozen_string_literal: true
class RemoveStatusService < BaseService
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include StreamEntryRenderer
def call(status)
Change IDs to strings rather than numbers in API JSON output (#5019) * Fix JavaScript interface with long IDs Somewhat predictably, the JS interface handled IDs as numbers, which in JS are IEEE double-precision floats. This loses some precision when working with numbers as large as those generated by the new ID scheme, so we instead handle them here as strings. This is relatively simple, and doesn't appear to have caused any problems, but should definitely be tested more thoroughly than the built-in tests. Several days of use appear to support this working properly. BREAKING CHANGE: The major(!) change here is that IDs are now returned as strings by the REST endpoints, rather than as integers. In practice, relatively few changes were required to make the existing JS UI work with this change, but it will likely hit API clients pretty hard: it's an entirely different type to consume. (The one API client I tested, Tusky, handles this with no problems, however.) Twitter ran into this issue when introducing Snowflake IDs, and decided to instead introduce an `id_str` field in JSON responses. I have opted to *not* do that, and instead force all IDs to 64-bit integers represented by strings in one go. (I believe Twitter exacerbated their problem by rolling out the changes three times: once for statuses, once for DMs, and once for user IDs, as well as by leaving an integer ID value in JSON. As they said, "If you’re using the `id` field with JSON in a Javascript-related language, there is a very high likelihood that the integers will be silently munged by Javascript interpreters. In most cases, this will result in behavior such as being unable to load or delete a specific direct message, because the ID you're sending to the API is different than the actual identifier associated with the message." [1]) However, given that this is a significant change for API users, alternatives or a transition time may be appropriate. 1: https://blog.twitter.com/developer/en_us/a/2011/direct-messages-going-snowflake-on-sep-30-2011.html * Additional fixes for stringified IDs in JSON These should be the last two. These were identified using eslint to try to identify any plain casts to JavaScript numbers. (Some such casts are legitimate, but these were not.) Adding the following to .eslintrc.yml will identify casts to numbers: ~~~ no-restricted-syntax: - warn - selector: UnaryExpression[operator='+'] > :not(Literal) message: Avoid the use of unary + - selector: CallExpression[callee.name='Number'] message: Casting with Number() may coerce string IDs to numbers ~~~ The remaining three casts appear legitimate: two casts to array indices, one in a server to turn an environment variable into a number. * Back out RelationshipsController Change This was made to make a test a bit less flakey, but has nothing to do with this branch. * Change internal streaming payloads to stringified IDs as well Per https://github.com/tootsuite/mastodon/pull/5019#issuecomment-330736452 we need these changes to send deleted status IDs as strings, not integers.
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@payload = Oj.dump(event: :delete, payload: status.id.to_s)
@status = status
@account = status.account
@tags = status.tags.pluck(:name).to_a
@mentions = status.mentions.includes(:account).to_a
@reblogs = status.reblogs.to_a
@stream_entry = status.stream_entry
remove_from_self if status.account.local?
remove_from_followers
remove_from_affected
remove_reblogs
remove_from_hashtags
remove_from_public
@status.destroy!
return unless @account.local?
remove_from_remote_followers
remove_from_remote_affected
end
private
def remove_from_self
unpush(:home, @account, @status)
end
def remove_from_followers
@account.followers.local.find_each do |follower|
unpush(:home, follower, @status)
end
end
def remove_from_affected
@mentions.map(&:account).select(&:local?).each do |account|
Redis.current.publish("timeline:#{account.id}", @payload)
end
end
def remove_from_remote_affected
# People who got mentioned in the status, or who
# reblogged it from someone else might not follow
# the author and wouldn't normally receive the
# delete notification - so here, we explicitly
# send it to them
target_accounts = (@mentions.map(&:account).reject(&:local?) + @reblogs.map(&:account).reject(&:local?)).uniq(&:id)
# Ostatus
NotificationWorker.push_bulk(target_accounts.select(&:ostatus?).uniq(&:domain)) do |target_account|
[salmon_xml, @account.id, target_account.id]
end
# ActivityPub
ActivityPub::DeliveryWorker.push_bulk(target_accounts.select(&:activitypub?).uniq(&:inbox_url)) do |target_account|
[signed_activity_json, @account.id, target_account.inbox_url]
end
end
def remove_from_remote_followers
# OStatus
Pubsubhubbub::RawDistributionWorker.perform_async(salmon_xml, @account.id)
# ActivityPub
ActivityPub::DeliveryWorker.push_bulk(@account.followers.inboxes) do |inbox_url|
[signed_activity_json, @account.id, inbox_url]
end
end
def salmon_xml
@salmon_xml ||= stream_entry_to_xml(@stream_entry)
end
def signed_activity_json
@signed_activity_json ||= Oj.dump(ActivityPub::LinkedDataSignature.new(activity_json).sign!(@account))
end
def activity_json
@activity_json ||= ActiveModelSerializers::SerializableResource.new(
@status,
serializer: @status.reblog? ? ActivityPub::UndoAnnounceSerializer : ActivityPub::DeleteSerializer,
adapter: ActivityPub::Adapter
).as_json
end
def remove_reblogs
# We delete reblogs of the status before the original status,
# because once original status is gone, reblogs will disappear
# without us being able to do all the fancy stuff
@reblogs.each do |reblog|
2016-09-29 21:28:21 +02:00
RemoveStatusService.new.call(reblog)
end
end
def unpush(type, receiver, status)
if status.reblog? && !redis.zscore(FeedManager.instance.key(type, receiver.id), status.reblog_of_id).nil?
redis.zadd(FeedManager.instance.key(type, receiver.id), status.reblog_of_id, status.reblog_of_id)
else
redis.zremrangebyscore(FeedManager.instance.key(type, receiver.id), status.id, status.id)
end
Redis.current.publish("timeline:#{receiver.id}", @payload)
end
def remove_from_hashtags
return unless @status.public_visibility?
@tags.each do |hashtag|
Redis.current.publish("timeline:hashtag:#{hashtag}", @payload)
Redis.current.publish("timeline:hashtag:#{hashtag}:local", @payload) if @status.local?
end
end
def remove_from_public
return unless @status.public_visibility?
Redis.current.publish('timeline:public', @payload)
Redis.current.publish('timeline:public:local', @payload) if @status.local?
end
def redis
Redis.current
end
end