#!/usr/bin/env ruby
#  Phusion Passenger - https://www.phusionpassenger.com/
#  Copyright (c) 2010-2015 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.

## Magic comment: begin bootstrap ##
source_root = File.expand_path("..", File.dirname(__FILE__))
$LOAD_PATH.unshift("#{source_root}/src/ruby_supportlib")
begin
  require 'rubygems'
rescue LoadError
end
require 'phusion_passenger'
## Magic comment: end bootstrap ##

PhusionPassenger.locate_directories
PhusionPassenger.require_passenger_lib 'constants'
PhusionPassenger.require_passenger_lib 'platform_info'
PhusionPassenger.require_passenger_lib 'admin_tools/instance_registry'
PhusionPassenger.require_passenger_lib 'config/utils'
PhusionPassenger.require_passenger_lib 'utils/ansi_colors'
require 'optparse'
require 'socket'
require 'net/http'

include PhusionPassenger::SharedConstants
include PhusionPassenger::AdminTools
include PhusionPassenger::Utils::AnsiColors

DEFAULT_OPTIONS = { :show => 'pool', :color => STDOUT.tty? }.freeze


##### Show status command #####

def command_show_status(argv, options)
  if argv.empty?
    instance = find_sole_instance
  else
    instance = find_instance_by_name_prefix(argv[0])
  end
  show_status(instance, options)
end

def find_sole_instance
  instances = InstanceRegistry.new.list
  if instances.empty?
    abort "ERROR: #{PROGRAM_NAME} doesn't seem to be running. If you " +
      "are sure that it is running, then the causes of this problem could be:\n\n" +
      "1. You customized the instance registry directory using Apache's " +
      "PassengerInstanceRegistryDir option, Nginx's passenger_instance_registry_dir " +
      "option, or #{PROGRAM_NAME} Standalone's --instance-registry-dir command line " +
      "argument. If so, please set the environment variable PASSENGER_INSTANCE_REGISTRY_DIR " +
      "to that directory and run passenger-status again.\n" +
      "2. The instance directory has been removed by an operating system background service. " +
      "Please set a different instance registry directory using Apache's " +
      "PassengerInstanceRegistryDir option, Nginx's passenger_instance_registry_dir " +
      "option, or #{PROGRAM_NAME} Standalone's --instance-registry-dir command line " +
      "argument."
  elsif instances.size == 1
    return instances.first
  else
    puts "It appears that multiple #{PROGRAM_NAME} instances are running. Please"
    puts "select a specific one by running:"
    puts
    puts "  passenger-status <NAME>"
    puts
    PhusionPassenger::Config::Utils.list_all_passenger_instances(instances)
    exit 1
  end
end

def find_instance_by_name_prefix(name)
  instance = InstanceRegistry.new.find_by_name_prefix(name)
  if instance == :ambigious
    abort "ERROR: there are multiple instances whose name start with '#{name}'. Please specify the full name."
  elsif instance
    return instance
  else
    abort "ERROR: there doesn't seem to be a #{PROGRAM_NAME} instance running with the name '#{name}'."
  end
end

def show_status(instance, options)
  # if the noshow override is not specified, the default is to show the header, unless show=xml
  if options[:noheader] != true && options[:show] != 'xml'
    print_header(STDOUT, instance)
  end

  case options[:show]
  when 'pool'
    request = Net::HTTP::Get.new("/pool.txt?colorize=#{options[:color]}&verbose=#{options[:verbose]}")
    try_performing_ro_admin_basic_auth(request, instance)
    response = instance.http_request("agents.s/core_api", request)
    if response.code.to_i / 100 == 2
      puts response.body
    elsif response.code.to_i == 401
      if response["pool-empty"] == "true"
        puts "#{PROGRAM_NAME} is currently not serving any applications."
      else
        print_permission_error_message
        exit 2
      end
    else
      STDERR.puts "*** An error occured."
      STDERR.puts "#{response.code}: #{response.body}"
      exit 2
    end

  when 'requests', 'server'
    request = Net::HTTP::Get.new("/server.json")
    try_performing_ro_admin_basic_auth(request, instance)
    response = instance.http_request("agents.s/core_api", request)
    if response.code.to_i / 100 == 2
      puts response.body
    elsif response.code.to_i == 401
      print_permission_error_message
      exit 2
    else
      STDERR.puts "*** An error occured."
      STDERR.puts "#{response.code}: #{response.body}"
      exit 2
    end

  when 'backtraces'
    request = Net::HTTP::Get.new("/backtraces.txt")
    try_performing_ro_admin_basic_auth(request, instance)
    response = instance.http_request("agents.s/core_api", request)
    if response.code.to_i / 100 == 2
      text = response.body
      # Colorize output
      color = PhusionPassenger::Utils::AnsiColors.new
      text.gsub!(/^(Thread .*:)$/, color.black_bg + color.yellow + '\1' + color.reset)
      text.gsub!(/^( +in '.*? )(.*?)\(/, '\1' + color.bold + '\2' + color.reset + '(')
      puts text
    elsif response.code.to_i == 401
      print_permission_error_message
      exit 2
    else
      STDERR.puts "*** An error occured."
      STDERR.puts "#{response.code}: #{response.body}"
      exit 2
    end

  when 'xml'
    request = Net::HTTP::Get.new("/pool.xml?secrets=#{options[:verbose]}")
    try_performing_ro_admin_basic_auth(request, instance)
    response = instance.http_request("agents.s/core_api", request)
    if response.code.to_i / 100 == 2
      indented = format_with_xmllint(response.body)
      if indented
        puts indented
      else
        puts response.body
        STDERR.puts "*** Tip: if you install the 'xmllint' command then the XML output will be indented."
      end
    elsif response.code.to_i == 401
      if response["pool-empty"] == "true"
        puts "#{PROGRAM_NAME} is currently not serving any applications."
      else
        print_permission_error_message
        exit 2
      end
    else
      STDERR.puts "*** An error occured."
      STDERR.puts "#{response.code}: #{response.body}"
      exit 2
    end

  when 'union_station'
    request = Net::HTTP::Get.new("/server.json")
    try_performing_ro_admin_basic_auth(request, instance)
    response = instance.http_request("agents.s/ust_router_api", request)
    if response.code.to_i / 100 == 2
      puts response.body
    elsif response.code.to_i == 401
      print_permission_error_message
      exit 2
    else
      STDERR.puts "*** An error occured."
      STDERR.puts "#{response.code}: #{response.body}"
      exit 2
    end
  end
end

def print_header(io, instance)
  io.puts "Version : #{PhusionPassenger::VERSION_STRING}"
  io.puts "Date    : #{Time.now}"
  io.puts "Instance: #{instance.name} (#{instance.server_software})"
  io.puts
end

def try_performing_ro_admin_basic_auth(request, instance)
  begin
    password = instance.read_only_admin_password
  rescue Errno::EACCES
    return
  end
  request.basic_auth("ro_admin", password)
end

def print_permission_error_message
  PhusionPassenger.require_passenger_lib 'platform_info/ruby'
  STDERR.puts "*** ERROR: You are not authorized to query the status for this " <<
    "#{PROGRAM_NAME} instance. Please try again with '#{PhusionPassenger::PlatformInfo.ruby_sudo_command}'."
end

def format_with_xmllint(xml)
  return nil if !PhusionPassenger::PlatformInfo.find_command('xmllint')
  require 'open3'
  require 'thread'
  ENV['XMLLINT_INDENT'] = '   '
  Open3.popen3("xmllint", "--format", "-") do |stdin, stdout, stderr|
    stdout_text = nil
    stderr_text = nil
    thread1 = Thread.new do
      stdin.write(xml)
      stdin.close
    end
    thread2 = Thread.new do
      stdout_text = stdout.read
      stdout.close
    end
    thread3 = Thread.new do
      stderr_text = stderr.read
      stderr.close
    end
    thread1.join
    thread2.join
    thread3.join

    if stdout_text.nil? || stdout_text.empty?
      if stderr_text !~ /No such file or directory/ && stderr_text !~ /command not found/
        STDERR.puts stderr_text
      end
      return nil
    else
      return stdout_text
    end
  end
end


##### Main command dispatcher #####

def create_option_parser(options)
  return OptionParser.new do |opts|
    nl = "\n" << " " * 37
    opts.banner = "Usage: passenger-status [options] [instance name]"
    opts.separator ""
    opts.separator "Tool for inspecting Phusion Passenger's internal status."
    opts.separator ""

    opts.separator "Options:"
    opts.on("--show=pool|server|backtraces|xml|union_station", String,
            "Whether to show the pool's contents,#{nl}" <<
            "the currently running requests,#{nl}" <<
            "the backtraces of all threads or an XML#{nl}" <<
            "description of the pool.") do |what|
      if what !~ /\A(pool|server|requests|backtraces|xml|union_station)\Z/
        STDERR.puts "Invalid argument for --show."
        exit 1
      else
        options[:show] = what
      end
    end
    opts.on("--no-header", "Do not display an informative header#{nl}" <<
            "containing the timestamp, version number,#{nl}" <<
            "etc.") do
      options[:noheader] = true
    end
    opts.on("--force-colors", "Display colors even if stdout is not a TTY") do
      options[:color] = true
    end
    opts.on("--verbose", "-v", "Show verbose information.") do
      options[:verbose] = true
    end
  end
end

def parse_argv
  options = DEFAULT_OPTIONS.dup
  parser = create_option_parser(options)
  begin
    parser.parse!
  rescue OptionParser::ParseError => e
    puts e
    puts
    puts "Please see '--help' for valid options."
    exit 1
  end

  return options
end

def infer_command
  if !ARGV[0] || ARGV[0] !~ /^-/
    return [:show_status, ARGV.dup]
  else
    command_name, *argv = ARGV
    if respond_to?("command_#{command_name}")
      return [command_name, argv]
    else
      abort "ERROR: unrecognized command '#{command_name}'"
    end
  end
end

def start
  options = parse_argv
  command, argv = infer_command
  send("command_#{command}", argv, options)
end

start
