#!/usr/bin/env ruby
# encoding: binary
#  Phusion Passenger - https://www.phusionpassenger.com/
#  Copyright (c) 2010-2017 Phusion Holding B.V.
#
#  "Passenger", "Phusion Passenger" and "Union Station" are registered
#  trademarks of Phusion Holding B.V.
#
#  Permission is hereby granted, free of charge, to any person obtaining a copy
#  of this software and associated documentation files (the "Software"), to deal
#  in the Software without restriction, including without limitation the rights
#  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#  copies of the Software, and to permit persons to whom the Software is
#  furnished to do so, subject to the following conditions:
#
#  The above copyright notice and this permission notice shall be included in
#  all copies or substantial portions of the Software.
#
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#  THE SOFTWARE.

require 'socket'
require 'thread'
require 'logger'

module PhusionPassenger
  module App
    def self.options
      return @@options
    end

    def self.exit_code_for_exception(e)
      if e.is_a?(SystemExit)
        return e.status
      else
        return 1
      end
    end

    def self.handshake_and_read_startup_request
      STDOUT.sync = true
      STDERR.sync = true
      puts "!> I have control 1.0"
      abort "Invalid initialization header" if STDIN.readline != "You have control 1.0\n"

      @@options = {}
      while (line = STDIN.readline) != "\n"
        name, value = line.strip.split(/: */, 2)
        @@options[name] = value
      end
    end

    def self.init_passenger
      require "#{options["ruby_libdir"]}/phusion_passenger"
      PhusionPassenger.locate_directories(options["passenger_root"])
      PhusionPassenger.require_passenger_lib 'message_channel'
      PhusionPassenger.require_passenger_lib 'utils/tmpio'
    end

    def self.ping_port(port)
      socket_domain = Socket::Constants::AF_INET
      sockaddr = Socket.pack_sockaddr_in(port, '127.0.0.1')
      begin
        socket = Socket.new(socket_domain, Socket::Constants::SOCK_STREAM, 0)
        begin
          socket.connect_nonblock(sockaddr)
        rescue Errno::ENOENT, Errno::EINPROGRESS, Errno::EAGAIN, Errno::EWOULDBLOCK
          if select(nil, [socket], nil, 0.1)
            begin
              socket.connect_nonblock(sockaddr)
            rescue Errno::EISCONN
            end
          else
            raise Errno::ECONNREFUSED
          end
        end
        return true
      rescue Errno::ECONNREFUSED, Errno::ENOENT
        return false
      ensure
        socket.close if socket
      end
    end

    def self.load_app
      port = nil
      tries = 0
      while port.nil? && tries < 200
        port = 1024 + rand(9999)
        if ping_port(port) || ping_port(port + 1) || ping_port(port + 2)
          port = nil
          tries += 1
        end
      end
      if port.nil?
        abort "Cannot find a suitable port to start Meteor on"
      end

      production = options["environment"] == "production" ? "--production" : ""
      pid = fork do
        # Meteor is quite !@#$% here: if we kill its start script
        # with *any* signal, it'll leave a ton of garbage processes
        # around. Apparently it expects the user to press Ctrl-C in a
        # terminal which happens to send a signal to all processes
        # in the session. We emulate that behavior here by giving
        # Meteor its own process group, and sending signals to the
        # entire process group.
        Process.setpgrp
        
        if options["environment"] == "production"
          puts("Warning: meteor running in simulated production mode (--production). For real production use, bundle your app.")
        end
        
        if options["meteor_app_settings"]
          PhusionPassenger.require_passenger_lib 'utils/shellwords'
          app_settings_file = Shellwords.escape(options["meteor_app_settings"])
          puts("Using application settings from file #{app_settings_file}")
          exec("meteor run -p #{port} --settings #{app_settings_file} #{production}")
        else
          exec("meteor run -p #{port} #{production}")
        end
        exec("meteor run -p #{port} #{production} --settings settings.json")
      end
      $0 = options["process_title"] if options["process_title"]
      $0 = "#{$0} (#{pid})"
      return [pid, port]
    end

    def self.wait_for_exit_message
      begin
        STDIN.readline
      rescue EOFError
      end
    end


    ################## Main code ##################


    handshake_and_read_startup_request
    init_passenger
    begin
      pid, port = load_app
      while !ping_port(port)
        sleep 0.01
      end
      puts "!> Ready"
      puts "!> socket: main;tcp://127.0.0.1:#{port};http_session;0"
      puts "!> "
      wait_for_exit_message
    ensure
      if pid
        Process.kill('INT', -pid) rescue nil
        Process.waitpid(pid) rescue nil
        Process.kill('INT', -pid) rescue nil
      end
    end

  end # module App
end # module PhusionPassenger