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Filename : protocol.rb
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# frozen_string_literal: false
#
# = net/protocol.rb
#
#--
# Copyright (c) 1999-2004 Yukihiro Matsumoto
# Copyright (c) 1999-2004 Minero Aoki
#
# written and maintained by Minero Aoki <aamine@loveruby.net>
#
# This program is free software. You can re-distribute and/or
# modify this program under the same terms as Ruby itself,
# Ruby Distribute License or GNU General Public License.
#
# $Id: protocol.rb 59533 2017-08-09 08:10:56Z usa $
#++
#
# WARNING: This file is going to remove.
# Do not rely on the implementation written in this file.
#

require 'socket'
require 'timeout'
require 'io/wait'

module Net # :nodoc:

  class Protocol   #:nodoc: internal use only
    private
    def Protocol.protocol_param(name, val)
      module_eval(<<-End, __FILE__, __LINE__ + 1)
        def #{name}
          #{val}
        end
      End
    end

    def ssl_socket_connect(s, timeout)
      if timeout
        while true
          raise Net::OpenTimeout if timeout <= 0
          start = Process.clock_gettime Process::CLOCK_MONOTONIC
          # to_io is required because SSLSocket doesn't have wait_readable yet
          case s.connect_nonblock(exception: false)
          when :wait_readable; s.to_io.wait_readable(timeout)
          when :wait_writable; s.to_io.wait_writable(timeout)
          else; break
          end
          timeout -= Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
        end
      else
        s.connect
      end
    end
  end


  class ProtocolError          < StandardError; end
  class ProtoSyntaxError       < ProtocolError; end
  class ProtoFatalError        < ProtocolError; end
  class ProtoUnknownError      < ProtocolError; end
  class ProtoServerError       < ProtocolError; end
  class ProtoAuthError         < ProtocolError; end
  class ProtoCommandError      < ProtocolError; end
  class ProtoRetriableError    < ProtocolError; end
  ProtocRetryError = ProtoRetriableError

  ##
  # OpenTimeout, a subclass of Timeout::Error, is raised if a connection cannot
  # be created within the open_timeout.

  class OpenTimeout            < Timeout::Error; end

  ##
  # ReadTimeout, a subclass of Timeout::Error, is raised if a chunk of the
  # response cannot be read within the read_timeout.

  class ReadTimeout            < Timeout::Error; end


  class BufferedIO   #:nodoc: internal use only
    def initialize(io)
      @io = io
      @read_timeout = 60
      @continue_timeout = nil
      @debug_output = nil
      @rbuf = ''
    end

    attr_reader :io
    attr_accessor :read_timeout
    attr_accessor :continue_timeout
    attr_accessor :debug_output

    def inspect
      "#<#{self.class} io=#{@io}>"
    end

    def eof?
      @io.eof?
    end

    def closed?
      @io.closed?
    end

    def close
      @io.close
    end

    #
    # Read
    #

    public

    def read(len, dest = '', ignore_eof = false)
      LOG "reading #{len} bytes..."
      read_bytes = 0
      begin
        while read_bytes + @rbuf.size < len
          dest << (s = rbuf_consume(@rbuf.size))
          read_bytes += s.size
          rbuf_fill
        end
        dest << (s = rbuf_consume(len - read_bytes))
        read_bytes += s.size
      rescue EOFError
        raise unless ignore_eof
      end
      LOG "read #{read_bytes} bytes"
      dest
    end

    def read_all(dest = '')
      LOG 'reading all...'
      read_bytes = 0
      begin
        while true
          dest << (s = rbuf_consume(@rbuf.size))
          read_bytes += s.size
          rbuf_fill
        end
      rescue EOFError
        ;
      end
      LOG "read #{read_bytes} bytes"
      dest
    end

    def readuntil(terminator, ignore_eof = false)
      begin
        until idx = @rbuf.index(terminator)
          rbuf_fill
        end
        return rbuf_consume(idx + terminator.size)
      rescue EOFError
        raise unless ignore_eof
        return rbuf_consume(@rbuf.size)
      end
    end

    def readline
      readuntil("\n").chop
    end

    private

    BUFSIZE = 1024 * 16

    def rbuf_fill
      case rv = @io.read_nonblock(BUFSIZE, exception: false)
      when String
        return @rbuf << rv
      when :wait_readable
        @io.to_io.wait_readable(@read_timeout) or raise Net::ReadTimeout
        # continue looping
      when :wait_writable
        # OpenSSL::Buffering#read_nonblock may fail with IO::WaitWritable.
        # http://www.openssl.org/support/faq.html#PROG10
        @io.to_io.wait_writable(@read_timeout) or raise Net::ReadTimeout
        # continue looping
      when nil
        # callers do not care about backtrace, so avoid allocating for it
        raise EOFError, 'end of file reached', []
      end while true
    end

    def rbuf_consume(len)
      s = @rbuf.slice!(0, len)
      @debug_output << %Q[-> #{s.dump}\n] if @debug_output
      s
    end

    #
    # Write
    #

    public

    def write(str)
      writing {
        write0 str
      }
    end

    alias << write

    def writeline(str)
      writing {
        write0 str + "\r\n"
      }
    end

    private

    def writing
      @written_bytes = 0
      @debug_output << '<- ' if @debug_output
      yield
      @debug_output << "\n" if @debug_output
      bytes = @written_bytes
      @written_bytes = nil
      bytes
    end

    def write0(str)
      @debug_output << str.dump if @debug_output
      len = @io.write(str)
      @written_bytes += len
      len
    end

    #
    # Logging
    #

    private

    def LOG_off
      @save_debug_out = @debug_output
      @debug_output = nil
    end

    def LOG_on
      @debug_output = @save_debug_out
    end

    def LOG(msg)
      return unless @debug_output
      @debug_output << msg + "\n"
    end
  end


  class InternetMessageIO < BufferedIO   #:nodoc: internal use only
    def initialize(io)
      super
      @wbuf = nil
    end

    #
    # Read
    #

    def each_message_chunk
      LOG 'reading message...'
      LOG_off()
      read_bytes = 0
      while (line = readuntil("\r\n")) != ".\r\n"
        read_bytes += line.size
        yield line.sub(/\A\./, '')
      end
      LOG_on()
      LOG "read message (#{read_bytes} bytes)"
    end

    # *library private* (cannot handle 'break')
    def each_list_item
      while (str = readuntil("\r\n")) != ".\r\n"
        yield str.chop
      end
    end

    def write_message_0(src)
      prev = @written_bytes
      each_crlf_line(src) do |line|
        write0 dot_stuff(line)
      end
      @written_bytes - prev
    end

    #
    # Write
    #

    def write_message(src)
      LOG "writing message from #{src.class}"
      LOG_off()
      len = writing {
        using_each_crlf_line {
          write_message_0 src
        }
      }
      LOG_on()
      LOG "wrote #{len} bytes"
      len
    end

    def write_message_by_block(&block)
      LOG 'writing message from block'
      LOG_off()
      len = writing {
        using_each_crlf_line {
          begin
            block.call(WriteAdapter.new(self, :write_message_0))
          rescue LocalJumpError
            # allow `break' from writer block
          end
        }
      }
      LOG_on()
      LOG "wrote #{len} bytes"
      len
    end

    private

    def dot_stuff(s)
      s.sub(/\A\./, '..')
    end

    def using_each_crlf_line
      @wbuf = ''
      yield
      if not @wbuf.empty?   # unterminated last line
        write0 dot_stuff(@wbuf.chomp) + "\r\n"
      elsif @written_bytes == 0   # empty src
        write0 "\r\n"
      end
      write0 ".\r\n"
      @wbuf = nil
    end

    def each_crlf_line(src)
      buffer_filling(@wbuf, src) do
        while line = @wbuf.slice!(/\A[^\r\n]*(?:\n|\r(?:\n|(?!\z)))/)
          yield line.chomp("\n") + "\r\n"
        end
      end
    end

    def buffer_filling(buf, src)
      case src
      when String    # for speeding up.
        0.step(src.size - 1, 1024) do |i|
          buf << src[i, 1024]
          yield
        end
      when File    # for speeding up.
        while s = src.read(1024)
          buf << s
          yield
        end
      else    # generic reader
        src.each do |str|
          buf << str
          yield if buf.size > 1024
        end
        yield unless buf.empty?
      end
    end
  end


  #
  # The writer adapter class
  #
  class WriteAdapter
    def initialize(socket, method)
      @socket = socket
      @method_id = method
    end

    def inspect
      "#<#{self.class} socket=#{@socket.inspect}>"
    end

    def write(str)
      @socket.__send__(@method_id, str)
    end

    alias print write

    def <<(str)
      write str
      self
    end

    def puts(str = '')
      write str.chomp("\n") + "\n"
    end

    def printf(*args)
      write sprintf(*args)
    end
  end


  class ReadAdapter   #:nodoc: internal use only
    def initialize(block)
      @block = block
    end

    def inspect
      "#<#{self.class}>"
    end

    def <<(str)
      call_block(str, &@block) if @block
    end

    private

    # This method is needed because @block must be called by yield,
    # not Proc#call.  You can see difference when using `break' in
    # the block.
    def call_block(str)
      yield str
    end
  end


  module NetPrivate   #:nodoc: obsolete
    Socket = ::Net::InternetMessageIO
  end

end   # module Net