Module: OverSIP::Launcher

Extended by:
Logger
Defined in:
lib/oversip/launcher.rb

Constant Summary collapse

READY_PIPE_TIMEOUT = 
16

Class Method Summary collapse

Methods included from Logger

fg_system_msg2str, load_methods, log_id

Class Method Details

.assert_file_is_writable_readable_deletable(path) ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 232

def self.assert_file_is_writable_readable_deletable path
  # File already exists.
  if ::File.exist?(path)
    if not ::File.file?(path)
      raise ::OverSIP::Error, "'#{path}' exits and is not a regular file"
    elsif not ::File.readable?(path)
      raise ::OverSIP::Error, "'#{path}' is not readable"
    elsif not ::File.writable?(path)
      raise ::OverSIP::Error, "'#{path}' is not writable"
    end
  end
  # Check if the parent directory is writeable.
  if not ::File.writable? ::File.dirname(path)
    raise ::OverSIP::Error, "directory '#{::File.dirname(path)}' is not writable"
  end
end

.create_pid_file(path) ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 211

def self.create_pid_file path
  # Check that the PID file is accesible.
  begin
    assert_file_is_writable_readable_deletable(path)
  rescue ::OverSIP::Error => e
    fatal "cannot create PID file: #{e.message}"
  end
  # If the PID file exists (it shouldn't) check if it's stale.
  if wpid = valid_pid?(path) and wpid != $$
    fatal "already running on PID #{wpid} (or '#{path}' is stale)"
  end
  # Delete the PID file if it exists.
  ::File.unlink(path) rescue nil
  # Create the PID file.
  ::File.open(path, "w", 0644) do |f|
    f.syswrite("#$$\n")
  end
  ::OverSIP.pid_file = path
end

.daemonize!(options) ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 10

def self.daemonize! options
  @log_id = "launcher (daemonize)"

  $stdin.reopen("/dev/null")

  # grandparent (launcher)  : Reads pipe, exits when master is ready.
  #  \_ parent              : Exits immediately ASAP.
  #      \_ master          : Writes to pipe when ready.

  rd, wr = IO.pipe
  grandparent = $$
  if fork
    wr.close # Grandparent does not write in the ready_pipe.
  else
    rd.close # Parent (so also future master) does not read from the ready_pipe.
    ::Process.setsid
    exit if fork # Parent dies now.
  end

  # I'm grandparent (launcher) process.
  if grandparent == $$
    # Master process will inmediatelly write in the ready_pipe its PID so we get
    # its PID.
    pid = nil
    begin
      ::Timeout.timeout(READY_PIPE_TIMEOUT/2) do
        pid = rd.gets("\n").to_i rescue nil
      end
    rescue ::Timeout::Error
      fatal "master process didn't notify its PID within #{READY_PIPE_TIMEOUT/2} seconds"
    end
    unless pid
      fatal "master process failed to start"
    end

    # This will block until OverSIP::Launcher.run ends succesfully (so master process
    # writes "ok" in the ready_pipe) or until the pipe is closes without writting into it
    # (so the master process has died).
    # It can also occur that master process blocks forever and never writes into the
    # ready pipe neither closes it. In this case a timeout is raised and master process
    # is killed.
    master_ok = nil
    begin
      ::Timeout::timeout(READY_PIPE_TIMEOUT/2) do
        master_ok = (rd.read(2) rescue nil)
      end
    rescue ::Timeout::Error
      log_system_crit "master process is not ready within #{READY_PIPE_TIMEOUT/2} seconds, killing it..."
      begin
        ::Process.kill(:TERM, pid)
        10.times do |i|
          sleep 0.05
          ::Process.wait(pid, ::Process::WNOHANG) rescue nil
          ::Process.kill(0, pid) rescue break
        end
        ::Process.kill(0, pid)
        ::Process.kill(:KILL, pid) rescue nil
      rescue ::Errno::ESRCH
      end
      fatal "master process killed"
    end
    unless master_ok == "ok"
      fatal "master process failed to start"
    end

    # Grandparent can die now with honor.
    exit 0

    # I'm master process.
  else
    options[:ready_pipe] = wr
  end
end

.delete_pid_file ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 551

def self.delete_pid_file
  return false  unless ::OverSIP.pid

  ::File.delete(::OverSIP.pid_file) rescue nil
end

.fatal(msg) ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 203

def self.fatal msg
  log_system_crit msg
  log_system_crit "exiting with error status"

  terminate error=true, fatal=true
end

.kill_stud_processes ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 615

def self.kill_stud_processes
  return false  unless ::OverSIP.pid
  return false  unless ::OverSIP.stud_pids

  ::OverSIP.stud_pids.each do |pid|
    begin
      log_system_info "killing stud server with PID #{pid}..."
      ::Process.kill(:TERM, pid)
      10.times do |i|
        sleep 0.05
        ::Process.wait(pid, ::Process::WNOHANG) rescue nil
        ::Process.kill(0, pid) rescue break
      end
      ::Process.kill(0, pid)
      ::Process.kill(:KILL, pid) rescue nil
    rescue ::Errno::ESRCH
    end
  end
end

.run(options) ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 85

def self.run options
  @log_id = "launcher (run)"

  configuration = ::OverSIP.configuration

  # Store the master process PID.
  ::OverSIP.pid = $$

  begin
    # Inmediatelly write into the ready_pipe so grandparent process reads it
    # and knowns which PID we have.
    ready_pipe = options.delete(:ready_pipe)
    ready_pipe.write($$.to_s + "\n") if ready_pipe

    # Init modules.
    ::OverSIP::TLS.module_init
    ::OverSIP::SIP.module_init
    ::OverSIP::SIP::RFC3263.module_init
    ::OverSIP::WebSocket.module_init
    ::OverSIP::WebSocket::WsFraming.class_init
    ::OverSIP::WebSocket::WsSipApp.class_init

    @log_id = "launcher (master)"

    ::EM.run do

      ::OverSIP.is_ready = false
      ::OverSIP.status = :loading
      ::OverSIP.root_fiber = ::Fiber.current

      log_system_notice "using Ruby #{RUBY_VERSION}p#{RUBY_PATCHLEVEL} (#{RUBY_RELEASE_DATE} revision #{RUBY_REVISION}) [#{RUBY_PLATFORM}]"
      log_system_notice "using EventMachine-LE #{::EM::VERSION}"
      log_system_notice "starting event reactor..."

      # Run SIP and WebSocket servers.
      run_servers options

      # Run DNS resolver.
      ::OverSIP::SIP::RFC3263.run

      # Change process permissions if requested.
      set_user_group(options[:user], options[:group])

      # Create PID file.
      create_pid_file(options[:pid_file])

      trap_signals

      # Ensure the code in the next SystemEvents and SystemCallbacks are run serially.
      ::Fiber.new do

        # Run OverSIP::SystemEvents.on_initialize.
        log_system_debug "calling OverSIP::SystemEvents.on_initialize() method..."
        begin
          ::OverSIP::SystemEvents.on_initialize
        rescue ::Exception => e
          log_system_crit "error calling OverSIP::SystemEvents.on_initialize():"
          fatal e
        end

        # Run all the OverSIP::SystemCallbacks.on_started_callbacks.
        log_system_debug "executing OverSIP::SystemCallbacks.on_started_callbacks..."
        ::OverSIP::SystemCallbacks.on_started_callbacks.each do |cb|
          begin
            cb.call
          rescue ::Exception => e
            log_system_crit "error executing a callback in OverSIP::SystemCallbacks.on_started_callbacks:"
            fatal e
          end
        end

        # Run OverSIP::SystemEvents.on_started within a fiber.
        log_system_debug "calling OverSIP::SystemEvents.on_started() method..."
        begin
          ::OverSIP::SystemEvents.on_started
        rescue ::Exception => e
          log_system_crit "error calling OverSIP::SystemEvents.on_started():"
          fatal e
        end

        log_system_notice "#{::OverSIP::PROGRAM_NAME} #{::OverSIP::VERSION} running in background"

        # Write "ok" into the ready_pipe so grandparent process (launcher)
        # exits with status 0.
        if ready_pipe
          ready_pipe.write("ok")
          ready_pipe.close rescue nil
          ready_pipe = nil
        end

        # Stop writting into standard output/error.
        $stdout.reopen("/dev/null")
        $stderr.reopen("/dev/null")
        ::OverSIP.daemonized = true

        # So update the logger to stop writting into stdout.
        ::OverSIP::Logger.load_methods

        # Set the EventMachine error handler.
        ::EM.error_handler do |e|
          log_system_error "error raised during event loop and rescued by EM.error_handler:"
          log_system_error e
        end

        ::OverSIP.is_ready = true
        ::OverSIP.status = :running

      end.resume

    end  # ::EM.run

  rescue => e
    fatal e
  end

end

.run_servers(options) ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 269

def self.run_servers options
  configuration = ::OverSIP.configuration

  if configuration[:sip][:sip_udp]
    # SIP UDP IPv4 server.
    if configuration[:sip][:enable_ipv4]
      ::OverSIP::SIP::Launcher.run true, :ipv4, configuration[:sip][:listen_ipv4],
                                    configuration[:sip][:listen_port], :udp
    end

    # SIP IPv6 UDP server.
    if configuration[:sip][:enable_ipv6]
      ::OverSIP::SIP::Launcher.run true, :ipv6, configuration[:sip][:listen_ipv6],
                                    configuration[:sip][:listen_port], :udp
    end
  end

  if configuration[:sip][:sip_tcp]
    # SIP IPv4 TCP server.
    if configuration[:sip][:enable_ipv4]
      ::OverSIP::SIP::Launcher.run true, :ipv4, configuration[:sip][:listen_ipv4],
                                    configuration[:sip][:listen_port], :tcp
    end

    # SIP IPv6 TCP server.
    if configuration[:sip][:enable_ipv6]
      ::OverSIP::SIP::Launcher.run true, :ipv6, configuration[:sip][:listen_ipv6],
                                    configuration[:sip][:listen_port], :tcp
    end
  end

  if configuration[:sip][:sip_tls]
    unless configuration[:sip][:use_tls_tunnel]
      # SIP IPv4 TLS server (native).
      if configuration[:sip][:enable_ipv4]
        ::OverSIP::SIP::Launcher.run true, :ipv4, configuration[:sip][:listen_ipv4],
                                      configuration[:sip][:listen_port_tls], :tls
      end

      # SIP IPv6 TLS server (native).
      if configuration[:sip][:enable_ipv6]
        ::OverSIP::SIP::Launcher.run true, :ipv6, configuration[:sip][:listen_ipv6],
                                      configuration[:sip][:listen_port_tls], :tls
      end
    else
      # SIP IPv4 TLS server (Stud).
      if configuration[:sip][:enable_ipv4]
        ::OverSIP::SIP::Launcher.run true, :ipv4, "127.0.0.1",
                                      configuration[:sip][:listen_port_tls_tunnel], :tls_tunnel,
                                      configuration[:sip][:listen_ipv4],
                                      configuration[:sip][:listen_port_tls]
        ::OverSIP::SIP::Launcher.run false, :ipv4, configuration[:sip][:listen_ipv4],
                                      configuration[:sip][:listen_port_tls], :tls

        # Spawn a Stud process.
        spawn_stud_process options,
                           configuration[:sip][:listen_ipv4], configuration[:sip][:listen_port_tls],
                           "127.0.0.1", configuration[:sip][:listen_port_tls_tunnel],
                           ssl = false
      end

      # SIP IPv6 TLS server (Stud).
      if configuration[:sip][:enable_ipv6]
        ::OverSIP::SIP::Launcher.run true, :ipv6, "::1",
                                      configuration[:sip][:listen_port_tls_tunnel], :tls_tunnel,
                                      configuration[:sip][:listen_ipv6],
                                      configuration[:sip][:listen_port_tls]
        ::OverSIP::SIP::Launcher.run false, :ipv6, configuration[:sip][:listen_ipv6],
                                      configuration[:sip][:listen_port_tls], :tls

        # Spawn a Stud process.
        spawn_stud_process options,
                           configuration[:sip][:listen_ipv6], configuration[:sip][:listen_port_tls],
                           "::1", configuration[:sip][:listen_port_tls_tunnel],
                           ssl = false
      end
    end
  end

  if configuration[:websocket][:sip_ws]
    # WebSocket IPv4 TCP SIP server.
    if configuration[:websocket][:enable_ipv4]
      ::OverSIP::WebSocket::Launcher.run true, :ipv4, configuration[:websocket][:listen_ipv4],
                                                configuration[:websocket][:listen_port], :ws
    end

    # WebSocket IPv6 TCP SIP server.
    if configuration[:websocket][:enable_ipv6]
      ::OverSIP::WebSocket::Launcher.run true, :ipv6, configuration[:websocket][:listen_ipv6],
                                                configuration[:websocket][:listen_port], :ws
    end
  end

  if configuration[:websocket][:sip_wss]
    unless configuration[:websocket][:use_tls_tunnel]
      # WebSocket IPv4 TLS SIP server (native).
      if configuration[:websocket][:enable_ipv4]
        ::OverSIP::WebSocket::Launcher.run true, :ipv4, configuration[:websocket][:listen_ipv4],
                                      configuration[:websocket][:listen_port_tls], :wss
      end

      # WebSocket IPv6 TLS SIP server (native).
      if configuration[:websocket][:enable_ipv6]
        ::OverSIP::WebSocket::Launcher.run true, :ipv6, configuration[:websocket][:listen_ipv6],
                                      configuration[:websocket][:listen_port_tls], :wss
      end
    else
      # WebSocket IPv4 TLS SIP server (Stud).
      if configuration[:websocket][:enable_ipv4]
        ::OverSIP::WebSocket::Launcher.run true, :ipv4, "127.0.0.1",
                                      configuration[:websocket][:listen_port_tls_tunnel], :wss_tunnel,
                                      configuration[:websocket][:listen_ipv4],
                                      configuration[:websocket][:listen_port_tls]
        ::OverSIP::WebSocket::Launcher.run false, :ipv4, configuration[:websocket][:listen_ipv4],
                                      configuration[:websocket][:listen_port_tls], :wss

        # Spawn a Stud process.
        spawn_stud_process options,
                           configuration[:websocket][:listen_ipv4], configuration[:websocket][:listen_port_tls],
                           "127.0.0.1", configuration[:websocket][:listen_port_tls_tunnel],
                           ssl = true
      end

      # WebSocket IPv6 TLS SIP server (Stud).
      if configuration[:sip][:enable_ipv6]
        ::OverSIP::WebSocket::Launcher.run true, :ipv6, "::1",
                                      configuration[:websocket][:listen_port_tls_tunnel], :wss_tunnel,
                                      configuration[:websocket][:listen_ipv6],
                                      configuration[:websocket][:listen_port_tls]
        ::OverSIP::WebSocket::Launcher.run false, :ipv6, configuration[:websocket][:listen_ipv6],
                                      configuration[:websocket][:listen_port_tls], :wss

        # Spawn a Stud process.
        spawn_stud_process options,
                           configuration[:websocket][:listen_ipv6], configuration[:websocket][:listen_port_tls],
                           "::1", configuration[:websocket][:listen_port_tls_tunnel],
                           ssl = true
      end
    end
  end
end

.set_user_group(user, group) ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 558

def self.set_user_group user, group
  uid = ::Etc.getpwnam(user).uid  if user
  gid = ::Etc.getgrnam(group).gid  if group
  if uid or gid
    if gid and ::Process.egid != gid
      ::Process.initgroups(user, gid)  if user
      ::Process::GID.change_privilege(gid)
    end
    if uid
      ::Process.euid != uid and ::Process::UID.change_privilege(uid)
    end
  end
end

.spawn_stud_process(options, listen_ip, listen_port, bg_ip, bg_port, ssl = false) ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 573

def self.spawn_stud_process options, listen_ip, listen_port, bg_ip, bg_port, ssl=false
  stud_user_group = ""
  stud_user_group << "-u #{options[:user]}" if options[:user]
  stud_user_group << " -g #{options[:group]}" if options[:group]
  ssl_option = ( ssl ? "--ssl" : "" )

  bin_dir = ::File.join(::File.absolute_path(::File.dirname(__FILE__)), "../../bin/")
  stdout_file = "/tmp/stud.#{listen_ip}:#{listen_port}.out"
  stderr_file = "/tmp/stud.#{listen_ip}:#{listen_port}.err"

  ::Dir.chdir(bin_dir) do
    pid = ::POSIX::Spawn.spawn "./oversip_stud #{stud_user_group} #{ssl_option} -f '#{listen_ip},#{listen_port}' -b '#{bg_ip},#{bg_port}' -n 2 -s --daemon --write-proxy #{::OverSIP.configuration[:tls][:full_cert]}", :out => stdout_file, :err => stderr_file
    ::Process.waitpid(pid)
  end

  # Get the PID of the daemonized stud process.
  stdout = ::File.read stdout_file
  pid = nil
  stdout.each_line do |line|
    pid = line.split(" ")[4]
    if pid
      pid = pid.gsub(/\./,"").to_i
      break  if pid > 0
    end
  end
  ::File.delete stdout_file  rescue nil

  unless pid
    stderr = ::File.read stderr_file
    ::File.delete stderr_file  rescue nil
    log_system_crit "error spawning stud server for listening on #{listen_ip} : #{listen_port}:"
    fatal stderr
  end
  ::File.delete stderr_file  rescue nil

  ::OverSIP.stud_pids ||= []
  ::OverSIP.stud_pids << pid

  log_system_info "spawned stud server (PID #{pid}) listening on #{listen_ip} : #{listen_port}"
end

.terminate(error = false, fatal = false) ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 502

def self.terminate error=false, fatal=false
  ::OverSIP.is_ready = false
  ::OverSIP.status = :terminating

  # Trap TERM/QUIT signals (we are already exiting).
  trap(:TERM) {}
  trap(:QUIT) {}

  ::Fiber.new do

    unless fatal
      # Run OverSIP::SystemEvents.on_terminated.
      log_system_info "calling OverSIP::SystemEvents.on_terminated() method..."
      begin
        ::OverSIP::SystemEvents.on_terminated error
      rescue ::Exception => e
        log_system_crit "error calling OverSIP::SystemEvents.on_terminated():"
        log_system_crit e
      end

      # Run all the SystemCallbacks.on_terminated_callbacks in reverse order.
      log_system_info "executing OverSIP::SystemCallbacks.on_terminated_callbacks..."
      ::OverSIP::SystemCallbacks.on_terminated_callbacks.reverse.each do |cb|
        begin
          cb.call error
        rescue ::Exception => e
          log_system_crit "error executing a callback in OverSIP::SystemCallbacks.on_terminated_callbacks:"
          log_system_crit e
        end
      end
    end

    unless error
      log_system_info "exiting, thank you for tasting #{::OverSIP::PROGRAM_NAME}"
    end

    # Kill Stud processes and delete its temporal file with the full certificate.
    kill_stud_processes
    ::File.delete ::OverSIP.configuration[:tls][:full_cert]  rescue nil

    delete_pid_file

    # Exit by preventing any exception.
    exit!( error ? false : true )

  end.resume
end

.trap_signals ⇒ Object 



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# File 'lib/oversip/launcher.rb', line 412

def self.trap_signals
  # This should never occur (unless some not trapped signal is received
  # and causes Ruby to exit, or maybe the user called "exit()" within its
  # custom code).
  at_exit do
    if $!.is_a? ::SystemExit
      log_system_notice "exiting due to SystemExit..."
      terminate error=false
    else
      log_system_crit "exiting due to an unknown cause ($! = #{$!.inspect})..."
      terminate error=true
    end
  end

  # Signals that cause OverSIP to terminate.
  exit_signals = [:TERM, :QUIT]
  exit_signals.each do |signal|
    trap signal do
      log_system_notice "#{signal} signal received, exiting..."
      terminate error=false
    end
  end

  # Signals that must be ignored.
  ignore_signals = [:ALRM, :INT, :PIPE, :POLL, :PROF, :USR2, :WINCH]
  ignore_signals.each do |signal|
    begin
      trap signal do
        log_system_notice "#{signal.to_s.upcase} signal received, ignored"
      end
    rescue ::ArgumentError
      log_system_debug "cannot trap signal #{signal.to_s.upcase}, it could not exist in this system, ignoring it"
    end
  end

  # Ruby 2.0 does not allow trapping VTALRM signal. For other cases ignore it.
  begin
    trap :VTALRM do
    end
  rescue ::ArgumentError
  end

  # Signal HUP reloads OverSIP system configuration.
  trap :HUP do
    # Ignore another HUP signal until this code is finished.
    original_trap_proc = trap(:HUP){}

    log_system_notice "HUP signal received, reloading configuration files..."
    ::OverSIP::Config.system_reload

    # Run all the OverSIP::SystemCallbacks.on_reload_callbacks.
    log_system_info "executing OverSIP::SystemCallbacks.on_reload_callbacks..."
    ::Fiber.new do
      ::OverSIP::SystemCallbacks.on_reload_callbacks.each do |cb|
        begin
          cb.call
        rescue ::Exception => e
          log_system_crit "error executing a callback in OverSIP::SystemCallbacks.on_reload_callbacks:"
          log_system_crit e
        end
      end

      # Reset the signal handler.
      trap :HUP, original_trap_proc
    end.resume
  end

  # Signal USR1 reloads custom code provided by the user.
  trap :USR1 do
    # Ignore another HUP signal until this code is finished.
    original_trap_proc = trap(:USR1){}

    log_system_notice "USR1 signal received, calling OverSIP::SystemEvents.on_user_reload() method..."
    # Run OverSIP::SystemEvents.on_user_reload.
    ::Fiber.new do
      begin
        ::OverSIP::SystemEvents.on_user_reload
      rescue ::Exception => e
        log_system_crit "error calling OverSIP::SystemEvents.on_user_reload():"
        log_system_crit e
      end

      # Reset the signal handler.
      trap :USR1, original_trap_proc
    end.resume
  end

end

.valid_pid?(path) ⇒ Boolean

Returns a PID if a given path contains a non-stale PID file, false otherwise.

Returns:

  • (Boolean) 


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# File 'lib/oversip/launcher.rb', line 252

def self.valid_pid? path
  begin
    wpid = ::File.read(path).to_i
    wpid <= 0 and return false
    # If the process exists return its PID.
    ::Process.kill(0, wpid)
    return wpid
  # If the process exists but we don't have permissions over it, return its PID.
  rescue ::Errno::EPERM
    return wpid
  # If the PID file (path) doesn't exist or the process is not running return false.
  rescue ::Errno::ENOENT, ::Errno::ESRCH
    return false
  end
end