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Engine server hook #347

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Engine server hook #347

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f77a0ce
Engine server hook
bruno- Apr 18, 2024
534a840
The tailwindcss watch process must not steal keystrokes
flavorjones Apr 27, 2024
355ed62
Use ServerProcess class
bruno- Apr 29, 2024
eed5343
Add config.tailwindcss.server_process option
bruno- Apr 29, 2024
7265220
Enable server process only for new installs
bruno- Apr 29, 2024
b4879aa
Ensure ServerProcess is started only once
bruno- Apr 29, 2024
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10 changes: 10 additions & 0 deletions lib/install/tailwindcss.rb
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
APPLICATION_LAYOUT_PATH = Rails.root.join("app/views/layouts/application.html.erb")
CENTERING_CONTAINER_INSERTION_POINT = /^\s*<%= yield %>/.freeze
DEVELOPMENT_ENVIRONMENT_CONFIG_PATH = Rails.root.join("config/environments/development.rb")

if APPLICATION_LAYOUT_PATH.exist?
say "Add Tailwindcss include tags and container element in application layout"
Expand All @@ -16,6 +17,15 @@
say %( Add <%= stylesheet_link_tag "tailwind", "inter-font", "data-turbo-track": "reload" %> within the <head> tag in your custom layout.)
end

if DEVELOPMENT_ENVIRONMENT_CONFIG_PATH.exist?
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This will enable the "server process" only for new installs.

I opted for this solution over creating an initializer file because:

  • It's one file less to manage
  • Config options belong to config/environments/*, not initializers

say "Enable Tailwindcss server process in development"
insert_into_file DEVELOPMENT_ENVIRONMENT_CONFIG_PATH.to_s, <<~ERB.indent(2), before: /^end$/

# Automatically watch and build Tailwindcss when 'rails server' is started.
config.tailwindcss.server_process = true
ERB
end

say "Build into app/assets/builds"
empty_directory "app/assets/builds"
keep_file "app/assets/builds"
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1 change: 1 addition & 0 deletions lib/tailwindcss-rails.rb
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Expand Up @@ -5,3 +5,4 @@ module Tailwindcss
require_relative "tailwindcss/version"
require_relative "tailwindcss/engine"
require_relative "tailwindcss/commands"
require_relative "tailwindcss/server_process"
7 changes: 7 additions & 0 deletions lib/tailwindcss/engine.rb
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Expand Up @@ -2,6 +2,9 @@

module Tailwindcss
class Engine < ::Rails::Engine
config.tailwindcss = ActiveSupport::OrderedOptions.new
config.tailwindcss.server_process = false # Rails.env.development?
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If (or when) you decide to make "server process" the default for all:

  • Just set the tailwindcss.server_process option value to Rails.env.development? (propshaft does it like that)
  • Optionally remove the if DEVELOPMENT_ENVIRONMENT_CONFIG_PATH.exist? section from lib/install/tailwindcss.rb


initializer "tailwindcss.assets" do
Rails.application.config.assets.precompile += %w( inter-font.css )
end
Expand All @@ -13,5 +16,9 @@ class Engine < ::Rails::Engine
config.app_generators do |g|
g.template_engine :tailwindcss
end

server do
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ServerProcess.start if config.tailwindcss.server_process
end
end
end
149 changes: 149 additions & 0 deletions lib/tailwindcss/server_process.rb
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@@ -0,0 +1,149 @@
module Tailwindcss
class ServerProcess
attr_reader :server, :pid

def self.start
new.start
end

def initialize
@server = Server.new(self)
end

def start
@pid = existing_process || start_process
server.monitor_process
server.exit_hook
end

def stop
return if dead?

Process.kill(:INT, pid)
Process.wait(pid)
rescue Errno::ECHILD, Errno::ESRCH
end

def dead?
Process.wait(pid, Process::WNOHANG)
false
rescue Errno::ECHILD, Errno::ESRCH
true
end

private

def existing_process
if (pid = Pidfile.pid)
begin
Process.kill 0, pid
pid
rescue Errno::ESRCH
# Process does not exist
rescue Errno::EPERM
# Ignore process owned by another user
end
end
end

def start_process
pid = fork do
Pidfile.write
monitor_server
exit_hook
# Using IO.popen(command, 'r+') will avoid watch_command read from $stdin.
# If we use system(*command) instead, IRB and Debug can't read from $stdin
# correctly bacause some keystrokes will be taken by watch_command.
IO.popen(Commands.watch_command, 'r+') do |io|
IO.copy_stream(io, $stdout)
end
ensure
Pidfile.delete
end
Process.detach pid
pid
end

def monitor_server
Thread.new do
loop do
if server.dead?
puts "Tailwind detected server has gone away"
exit
end
sleep 2
end
end
end

def exit_hook
at_exit do
puts "Stopping tailwind..."
server.stop
end
end

module Pidfile
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Pidfile is a solution to a problem described here: #347 (comment)

def self.path
Rails.root.join("tmp", "pids", "tailwindcss.txt")
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New rails app already have tmp/pids/ dir https://github.com/rails/rails/blob/92591ebd54e044ff3f3b9d802fe65f69cb7e34f2/railties/lib/rails/generators/rails/app/app_generator.rb#L257-L260

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Why txt?

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This is similar to turning the cache on or off, touch restart.txt, etc.

end

def self.read
File.read(path, mode: "rb:UTF-8")
rescue Errno::ENOENT
# File does not exist
end

def self.write
File.write(path, Process.pid, mode: "wb:UTF-8")
end

def self.delete
File.exist?(path) && File.delete(path)
end

def self.pid
Integer(read)
rescue ArgumentError, TypeError
# Invalid content
delete
end
end

class Server
attr_reader :process, :pid

def initialize(process)
@process = process
@pid = Process.pid
end

def monitor_process
Thread.new do
loop do
if process.dead?
puts "Detected tailwind has gone away, stopping server..."
exit
end
sleep 2
end
end
end

def exit_hook
at_exit do
process.stop
end
end

def dead?
Process.ppid != pid
end

def stop
Process.kill(:INT, pid)
rescue Errno::ECHILD, Errno::ESRCH
end
end
end
end
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