discourse/lib/site_setting_extension.rb

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module SiteSettingExtension
module Types
String = 1
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Time = 2
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Fixnum = 3
Float = 4
Bool = 5
Null = 6
end
def mutex
@mutex ||= Mutex.new
end
def current
@@containers ||= {}
@@containers[RailsMultisite::ConnectionManagement.current_db] ||= {}
end
def defaults
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@defaults ||= {}
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end
def setting(name, default = nil, type = nil)
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mutex.synchronize do
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self.defaults[name] = default
current_value = current.has_key?(name) ? current[name] : default
setup_methods(name, current_value)
end
end
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# just like a setting, except that it is available in javascript via DiscourseSession
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def client_setting(name, default = nil, type = nil)
setting(name,default,type)
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@@client_settings ||= []
@@client_settings << name
end
def client_settings
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@@client_settings
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end
def client_settings_json
Rails.cache.fetch(SiteSettingExtension.client_settings_cache_key, expires_in: 30.minutes) do
MultiJson.dump(Hash[*@@client_settings.map{|n| [n, self.send(n)]}.flatten])
end
end
# Retrieve all settings
def all_settings
@defaults.map do |s, v|
{setting: s,
description: description(s),
default: v,
value: send(s).to_s}
end
end
def description(setting)
I18n.t("site_settings.#{setting}")
end
# table is not in the db yet, initial migration, etc
def table_exists?
@table_exists = ActiveRecord::Base.connection.table_exists? 'site_settings' if @table_exists == nil
@table_exists
end
def self.client_settings_cache_key
"client_settings_json"
end
# refresh all the site settings
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def refresh!
return unless table_exists?
mutex.synchronize do
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ensure_listen_for_changes
old = current
changes = []
deletions = []
all_settings = SiteSetting.select([:name,:value,:data_type])
new_hash = Hash[*(all_settings.map{|s| [s.name.intern, convert(s.value,s.data_type)]}.to_a.flatten)]
# add defaults
new_hash = defaults.merge(new_hash)
new_hash.each do |name, value|
changes << [name,value] if !old.has_key?(name) || old[name] != value
end
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old.each do |name,value|
deletions << [name,value] unless new_hash.has_key?(name)
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end
if deletions.length > 0 || changes.length > 0
@current = new_hash
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changes.each do |name, val|
setup_methods name, val
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end
deletions.each do |name,val|
setup_methods name, defaults[name]
end
end
Rails.cache.delete(SiteSettingExtension.client_settings_cache_key)
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end
end
def ensure_listen_for_changes
unless @subscribed
pid = process_id
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MessageBus.subscribe("/site_settings") do |msg|
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message = msg.data
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if message["process"] != pid
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begin
# picks a db
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MessageBus.on_connect.call(msg.site_id)
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SiteSetting.refresh!
ensure
MessageBus.on_disconnect.call(msg.site_id)
end
end
end
@subscribed = true
end
end
def process_id
@@process_id ||= SecureRandom.uuid
end
def remove_override!(name)
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return unless table_exists?
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SiteSetting.where(:name => name).destroy_all
end
def add_override!(name,val)
return unless table_exists?
setting = SiteSetting.where(:name => name).first
type = get_data_type(defaults[name])
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if type == Types::Bool && val != true && val != false
val = (val == "t" || val == "true") ? 't' : 'f'
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end
if type == Types::Fixnum && !(Fixnum === val)
val = val.to_i
end
if setting
setting.value = val
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setting.data_type = type
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setting.save
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else
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SiteSetting.create!(:name => name, :value => val, :data_type => type)
end
MessageBus.publish('/site_settings', {process: process_id})
end
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protected
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def get_data_type(val)
return Types::Null if val.nil?
if String === val
Types::String
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elsif Fixnum === val
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Types::Fixnum
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elsif TrueClass === val || FalseClass === val
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Types::Bool
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else
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raise ArgumentError.new :val
end
end
def convert(value, type)
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case type
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when Types::Fixnum
value.to_i
when Types::String
value
when Types::Bool
value == "t"
when Types::Null
nil
end
end
def setup_methods(name, current_value)
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# trivial multi db support, we can optimize this later
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db = RailsMultisite::ConnectionManagement.current_db
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@@containers ||= {}
@@containers[db] ||= {}
@@containers[db][name] = current_value
setter = ("#{name}=").sub("?","")
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eval "define_singleton_method :#{name} do
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c = @@containers[RailsMultisite::ConnectionManagement.current_db]
c = c[name] if c
c
end
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define_singleton_method :#{setter} do |val|
add_override!(:#{name}, val)
refresh!
end
"
end
def method_missing(method, *args, &block)
as_question = method.to_s.gsub(/\?$/, '')
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if respond_to?(as_question)
return send(as_question, *args, &block)
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end
super(method, *args, &block)
end
end