discourse/lib/stylesheet/watcher.rb

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# frozen_string_literal: true
require 'listen'
module Stylesheet
class Watcher
REDIS_KEY = "dev_last_used_theme_id"
def self.theme_id=(v)
$redis.set(REDIS_KEY, v)
end
def self.theme_id
($redis.get(REDIS_KEY) || SiteSetting.default_theme_id).to_i
end
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def self.watch(paths = nil)
watcher = new(paths)
watcher.start
watcher
end
def initialize(paths)
@paths = paths || Watcher.default_paths
@queue = Queue.new
end
def self.default_paths
return @default_paths if @default_paths
@default_paths = ["app/assets/stylesheets"]
Discourse.plugins.each do |p|
@default_paths << File.dirname(p.path).sub(Rails.root.to_s, '').sub(/^\//, '')
end
@default_paths
end
def start
Thread.new do
begin
while true
worker_loop
end
rescue => e
STDERR.puts "CSS change notifier crashed #{e}"
start
end
end
root = Rails.root.to_s
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listener_opts = { ignore: /xxxx/ }
listener_opts[:force_polling] = true if ENV['FORCE_POLLING']
@paths.each do |watch|
Thread.new do
begin
plugins_paths = Dir.glob("#{Rails.root}/plugins/*").map do |file|
File.symlink?(file) ? File.readlink(file) : file
end.compact
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listener = Listen.to("#{root}/#{watch}", listener_opts) do |modified, added, _|
paths = [modified, added].flatten
paths.compact!
paths.map! do |long|
plugin_name = nil
plugins_paths.each do |plugin_path|
if long.include?(plugin_path)
plugin_name = File.basename(plugin_path)
break
end
end
target = nil
if !plugin_name
target_match = long.match(/admin|desktop|mobile/)
if target_match&.length
target = target_match[0]
end
end
{
basename: File.basename(long),
target: target,
plugin_name: plugin_name
}
end
process_change(paths)
end
rescue => e
STDERR.puts "Failed to listen for CSS changes at: #{watch}\n#{e}"
end
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listener.start
sleep
end
end
end
def core_assets_refresh(target)
targets = target ? [target] : ["desktop", "mobile", "admin"]
Stylesheet::Manager.clear_core_cache!(targets)
message = targets.map! do |name|
Stylesheet::Manager.stylesheet_data(name.to_sym, Stylesheet::Watcher.theme_id)
end.flatten!
MessageBus.publish '/file-change', message
end
def plugin_assets_refresh(plugin_name)
Stylesheet::Manager.clear_plugin_cache!(plugin_name)
message = Stylesheet::Manager.stylesheet_data(plugin_name.to_sym, Stylesheet::Watcher.theme_id)
MessageBus.publish '/file-change', message
end
def worker_loop
path = @queue.pop
while @queue.length > 0
@queue.pop
end
if path[:plugin_name]
plugin_assets_refresh(path[:plugin_name])
else
core_assets_refresh(path[:target])
end
end
def process_change(paths)
paths.each do |path|
if path[:basename] =~ /\.(css|scss)$/
@queue.push path
end
end
end
end
end