discourse/lib/site_setting_extension.rb

344 lines
7.2 KiB
Ruby

require_dependency 'enum'
require_dependency 'site_settings/db_provider'
module SiteSettingExtension
# part 1 of refactor, centralizing the dependency here
def provider=(val)
@provider = val
refresh!
end
def provider
@provider ||= SiteSettings::DbProvider.new(SiteSetting)
end
def types
@types ||= Enum.new(:string, :time, :fixnum, :float, :bool, :null, :enum, :list)
end
def mutex
@mutex ||= Mutex.new
end
def current
@containers ||= {}
@containers[provider.current_site] ||= {}
end
def defaults
@defaults ||= {}
end
def categories
@categories ||= {}
end
def enums
@enums ||= {}
end
def lists
@lists ||= []
end
def choices
@choices ||= {}
end
def hidden_settings
@hidden_settings ||= []
end
def refresh_settings
@refresh_settings ||= []
end
def setting(name_arg, default = nil, opts = {})
name = name_arg.to_sym
mutex.synchronize do
self.defaults[name] = default
categories[name] = opts[:category] || :uncategorized
current_value = current.has_key?(name) ? current[name] : default
if opts[:enum]
enum = opts[:enum]
enums[name] = enum.is_a?(String) ? enum.constantize : enum
end
if opts[:choices]
choices.has_key?(name) ?
choices[name].concat(opts[:choices]) :
choices[name] = opts[:choices]
end
if opts[:list]
lists << name
end
if opts[:hidden]
hidden_settings << name
end
if opts[:refresh]
refresh_settings << name
end
current[name] = current_value
setup_methods(name, current_value)
end
end
# just like a setting, except that it is available in javascript via DiscourseSession
def client_setting(name, default = nil, opts = {})
setting(name, default, opts)
@client_settings ||= []
@client_settings << name
end
def client_settings
@client_settings ||= []
end
def settings_hash
result = {}
@defaults.each do |s, v|
result[s] = send(s).to_s
end
result
end
def client_settings_json
Rails.cache.fetch(SiteSettingExtension.client_settings_cache_key, expires_in: 30.minutes) do
client_settings_json_uncached
end
end
def client_settings_json_uncached
MultiJson.dump(Hash[*@client_settings.map{|n| [n, self.send(n)]}.flatten])
end
# Retrieve all settings
def all_settings(include_hidden=false)
@defaults
.reject{|s, v| hidden_settings.include?(s) || include_hidden}
.map do |s, v|
value = send(s)
type = types[get_data_type(s, value)]
opts = {setting: s,
description: description(s),
default: v,
type: type.to_s,
value: value.to_s,
category: categories[s]
}
opts.merge({valid_values: enum_class(s).values, translate_names: enum_class(s).translate_names?}) if type == :enum
opts[:choices] = choices[s] if choices.has_key? s
opts
end
end
def description(setting)
I18n.t("site_settings.#{setting}")
end
def self.client_settings_cache_key
"client_settings_json"
end
# refresh all the site settings
def refresh!
mutex.synchronize do
ensure_listen_for_changes
old = current
new_hash = Hash[*(provider.all.map{ |s|
[s.name.intern, convert(s.value,s.data_type)]
}.to_a.flatten)]
# add defaults, cause they are cached
new_hash = defaults.merge(new_hash)
changes,deletions = diff_hash(new_hash, old)
if deletions.length > 0 || changes.length > 0
changes.each do |name, val|
current[name] = val
end
deletions.each do |name,val|
current[name] = defaults[name]
end
end
clear_cache!
end
end
def ensure_listen_for_changes
unless @subscribed
MessageBus.subscribe("/site_settings") do |message|
process_message(message)
end
@subscribed = true
end
end
def process_message(message)
data = message.data
if data["process"] != process_id
begin
@last_message_processed = message.global_id
MessageBus.on_connect.call(message.site_id)
refresh!
ensure
MessageBus.on_disconnect.call(message.site_id)
end
end
end
def diags
{
last_message_processed: @last_message_processed
}
end
def process_id
@process_id ||= SecureRandom.uuid
end
def after_fork
@process_id = nil
ensure_listen_for_changes
end
def remove_override!(name)
provider.destroy(name)
current[name] = defaults[name]
clear_cache!
end
def add_override!(name,val)
type = get_data_type(name, defaults[name])
if type == types[:bool] && val != true && val != false
val = (val == "t" || val == "true") ? 't' : 'f'
end
if type == types[:fixnum] && !val.is_a?(Fixnum)
val = val.to_i
end
if type == types[:null] && val != ''
type = get_data_type(name, val)
end
if type == types[:enum]
raise Discourse::InvalidParameters.new(:value) unless enum_class(name).valid_value?(val)
end
provider.save(name, val, type)
current[name] = convert(val, type)
clear_cache!
end
def notify_changed!
MessageBus.publish('/site_settings', {process: process_id})
end
def has_setting?(name)
defaults.has_key?(name.to_sym) || defaults.has_key?("#{name}?".to_sym)
end
def requires_refresh?(name)
refresh_settings.include?(name.to_sym)
end
def set(name, value)
if has_setting?(name)
self.send("#{name}=", value)
Discourse.request_refresh! if requires_refresh?(name)
else
raise ArgumentError.new("No setting named #{name} exists")
end
end
protected
def clear_cache!
Rails.cache.delete(SiteSettingExtension.client_settings_cache_key)
end
def diff_hash(new_hash, old)
changes = []
deletions = []
new_hash.each do |name, value|
changes << [name,value] if !old.has_key?(name) || old[name] != value
end
old.each do |name,value|
deletions << [name,value] unless new_hash.has_key?(name)
end
[changes,deletions]
end
def get_data_type(name,val)
return types[:null] if val.nil?
return types[:enum] if enums[name]
return types[:list] if lists.include? name
case val
when String
types[:string]
when Fixnum
types[:fixnum]
when TrueClass, FalseClass
types[:bool]
else
raise ArgumentError.new :val
end
end
def convert(value, type)
case type
when types[:fixnum]
value.to_i
when types[:string], types[:list], types[:enum]
value
when types[:bool]
value == true || value == "t" || value == "true"
when types[:null]
nil
else
raise ArgumentError.new :type
end
end
def setup_methods(name, current_value)
clean_name = name.to_s.sub("?", "")
eval "define_singleton_method :#{clean_name} do
c = @containers[provider.current_site]
if c
c[name]
else
refresh!
current[name]
end
end
define_singleton_method :#{clean_name}? do
#{clean_name}
end
define_singleton_method :#{clean_name}= do |val|
add_override!(:#{name}, val)
end
"
end
def enum_class(name)
enums[name]
end
end