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Current File : /opt/passenger/src/ruby_supportlib/phusion_passenger/message_client.rb

# encoding: binary
#  Phusion Passenger - https://www.phusionpassenger.com/
#  Copyright (c) 2010-2025 Asynchronous B.V.
#
#  "Passenger", "Phusion Passenger" and "Union Station" are registered
#  trademarks of Asynchronous 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'
PhusionPassenger.require_passenger_lib 'message_channel'
PhusionPassenger.require_passenger_lib 'utils'

module PhusionPassenger

  # A convenience class for communicating with MessageServer servers,
  # for example the ApplicationPool server.
  class MessageClient
    include Utils

    class ProtocolError < StandardError
    end

    # Connect to the given server. By default it connects to the current
    # generation's core.
    def initialize(username, password, address)
      @socket = connect_to_server(address)
      begin
        @channel = MessageChannel.new(@socket)

        result = @channel.read
        if result.nil?
          raise EOFError
        elsif result.size != 2 || result[0] != "version"
          raise IOError, "The message server didn't sent a valid version identifier"
        elsif result[1] != "1"
          raise IOError, "Unsupported message server protocol version #{result[1]}"
        end

        @channel.write_scalar(username)
        @channel.write_scalar(password)

        result = @channel.read
        if result.nil?
          raise EOFError
        elsif result[0] != "status"
          raise ProtocolError, "Invalid authentication response: expected \"status\", got #{result[0].inspect}"
        elsif result[1] == "ok"
          # Do nothing
        elsif result[1] == "error"
          if result[2]
            raise SecurityError, "Authentication error: #{result[2]}"
          else
            raise SecurityError, "Authentication error (no server message given)"
          end
        else
          raise ProtocolError, "Invalid authentication response: #{result.inspect}"
        end
      rescue Exception
        @socket.close
        raise
      end
    end

    def close
      @socket.close if @socket
      @channel = @socket = nil
    end

    def connected?
      return !!@channel
    end

    ### Low level I/O methods ###

    def read
      return @channel.read
    rescue
      auto_disconnect
      raise
    end

    def write(*args)
      @channel.write(*args)
    rescue
      auto_disconnect
      raise
    end

    def write_scalar(*args)
      @channel.write_scalar(*args)
    rescue
      auto_disconnect
      raise
    end

    def read_scalar
      return @channel.read_scalar
    rescue
      auto_disconnect
      raise
    end

    def recv_io(klass = IO, negotiate = true)
      return @channel.recv_io(klass, negotiate)
    rescue
      auto_disconnect
      raise
    end

  private
    def auto_disconnect
      if @channel
        @socket.close rescue nil
        @socket = @channel = nil
      end
    end
  end

end # module PhusionPassenger

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