Merge remote-tracking branch 'origin/master' into gs-master

  Conflicts:
 	.travis.yml
 	Gemfile.lock
 	README.md
 	app/controllers/settings/follower_domains_controller.rb
 	app/controllers/statuses_controller.rb
 	app/javascript/mastodon/locales/ja.json
 	app/lib/feed_manager.rb
 	app/models/media_attachment.rb
 	app/models/mute.rb
 	app/models/status.rb
 	app/services/mute_service.rb
 	app/views/home/index.html.haml
 	app/views/stream_entries/_simple_status.html.haml
 	config/locales/ca.yml
 	config/locales/en.yml
 	config/locales/es.yml
 	config/locales/fr.yml
 	config/locales/nl.yml
 	config/locales/pl.yml
 	config/locales/pt-BR.yml
 	config/themes.yml

1 files changed, 34 insertions, 0 deletions

diff --git a/app/lib/entity_cache.rb b/app/lib/entity_cache.rb
new file mode 100644
index 000000000..2aa37389c
--- /dev/null
+++ b/app/lib/entity_cache.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require 'singleton'
+
+class EntityCache
+  include Singleton
+
+  MAX_EXPIRATION = 7.days.freeze
+
+  def mention(username, domain)
+    Rails.cache.fetch(to_key(:mention, username, domain), expires_in: MAX_EXPIRATION) { Account.select(:username, :domain, :url).find_remote(username, domain) }
+  end
+
+  def emoji(shortcodes, domain)
+    shortcodes   = [shortcodes] unless shortcodes.is_a?(Array)
+    cached       = Rails.cache.read_multi(*shortcodes.map { |shortcode| to_key(:emoji, shortcode, domain) })
+    uncached_ids = []
+
+    shortcodes.each do |shortcode|
+      uncached_ids << shortcode unless cached.key?(to_key(:emoji, shortcode, domain))
+    end
+
+    unless uncached_ids.empty?
+      uncached = CustomEmoji.where(shortcode: shortcodes, domain: domain, disabled: false).map { |item| [item.shortcode, item] }.to_h
+      uncached.each_value { |item| Rails.cache.write(to_key(:emoji, item.shortcode, domain), item, expires_in: MAX_EXPIRATION) }
+    end
+
+    shortcodes.map { |shortcode| cached[to_key(:emoji, shortcode, domain)] || uncached[shortcode] }.compact
+  end
+
+  def to_key(type, *ids)
+    "#{type}:#{ids.compact.map(&:downcase).join(':')}"
+  end
+end