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Fix #24 - Thread resolving for remote statuses

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This is a big one, so let me enumerate:

Accounts as well as stream entry pages now contain Link headers that
reference the Atom feed and Webfinger URL for the former and Atom entry
for the latter. So you only need to HEAD those resources to get that
information, no need to download and parse HTML <link>s.

ProcessFeedService will now queue ThreadResolveWorker for each remote
status that it cannot find otherwise. Furthermore, entries are now
processed in reverse order (from bottom to top) in case a newer entry
references a chronologically previous one.

ThreadResolveWorker uses FetchRemoteStatusService to obtain a status
and attach the child status it was queued for to it.

FetchRemoteStatusService looks up the URL, first with a HEAD, tests
if it's an Atom feed, in which case it processes it directly. Next
for Link headers to the Atom feed, in which case that is fetched
and processed. Lastly if it's HTML, it is checked for <link>s to the Atom
feed, and if such is found, that is fetched and processed. The account for
the status is derived from author/name attribute in the XML and the hostname
in the URL (domain). FollowRemoteAccountService and ProcessFeedService
are used.

This means that potentially threads are resolved recursively until a dead-end
is encountered, however it is performed asynchronously over background jobs,
so it should be ok.
This commit is contained in:
Eugen Rochko 2016-09-21 01:34:14 +02:00
parent 6d89edc4f7
commit 4bec613897
9 changed files with 130 additions and 5 deletions
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22
app/services/process_feed_service.rb
View file

@ -2,10 +2,11 @@ class ProcessFeedService < BaseService
# Create local statuses from an Atom feed
# @param [String] body Atom feed
# @param [Account] account Account this feed belongs to
# @return [Enumerable] created statuses
def call(body, account)
xml = Nokogiri::XML(body)
update_remote_profile_service.(xml.at_xpath('/xmlns:feed/xmlns:author'), account) unless xml.at_xpath('/xmlns:feed').nil?
xml.xpath('//xmlns:entry').each { |entry| process_entry(account, entry) }
xml.xpath('//xmlns:entry').reverse_each.map { |entry| process_entry(account, entry) }.compact
end
private
@ -45,6 +46,8 @@ class ProcessFeedService < BaseService
DistributionWorker.perform_async(status.id)
end
return status
end
def record_remote_mentions(status, links)
@ -103,6 +106,10 @@ class ProcessFeedService < BaseService
def add_reply!(entry, status)
status.thread = find_original_status(entry, thread_id(entry))
status.save!
if status.thread.nil? && !thread_href(entry).nil?
ThreadResolveWorker.perform_async(status.id, thread_href(entry))
end
end
def delete_post!(status)
@ -131,6 +138,13 @@ class ProcessFeedService < BaseService
status = Status.new(account: account, uri: target_id(xml), text: target_content(xml), url: target_url(xml), created_at: published(xml), updated_at: updated(xml))
status.thread = find_original_status(xml, thread_id(xml))
status.save
if status.saved? && status.thread.nil? && !thread_href(xml).nil?
ThreadResolveWorker.perform_async(status.id, thread_href(xml))
end
status
rescue Goldfinger::Error, HTTP::Error
nil
end
@ -153,6 +167,12 @@ class ProcessFeedService < BaseService
nil
end
def thread_href(xml)
xml.at_xpath('./thr:in-reply-to').attribute('href').value
rescue
nil
end
def target_id(xml)
xml.at_xpath('.//activity:object/xmlns:id').content
rescue