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Edit File : buffering.rb \| Size : 9.39 KB
# coding: binary # frozen_string_literal: false #-- #= Info # 'OpenSSL for Ruby 2' project # Copyright (C) 2001 GOTOU YUUZOU <gotoyuzo@notwork.org> # All rights reserved. # #= Licence # This program is licensed under the same licence as Ruby. # (See the file 'LICENCE'.) #++ ## # OpenSSL IO buffering mix-in module. # # This module allows an OpenSSL::SSL::SSLSocket to behave like an IO. # # You typically won't use this module directly, you can see it implemented in # OpenSSL::SSL::SSLSocket. module OpenSSL::Buffering include Enumerable ## # The "sync mode" of the SSLSocket. # # See IO#sync for full details. attr_accessor :sync ## # Default size to read from or write to the SSLSocket for buffer operations. BLOCK_SIZE = 102416 ## # Creates an instance of OpenSSL's buffering IO module. def initialize() super @eof = false @rbuffer = "" @sync = @io.sync end # # for reading. # private ## # Fills the buffer from the underlying SSLSocket def fill_rbuff begin @rbuffer << self.sysread(BLOCK_SIZE) rescue Errno::EAGAIN retry rescue EOFError @eof = true end end ## # Consumes +size+ bytes from the buffer def consume_rbuff(size=nil) if @rbuffer.empty? nil else size = @rbuffer.size unless size ret = @rbuffer[0, size] @rbuffer[0, size] = "" ret end end public ## # Reads +size+ bytes from the stream. If +buf+ is provided it must # reference a string which will receive the data. # # See IO#read for full details. def read(size=nil, buf=nil) if size == 0 if buf buf.clear return buf else return "" end end until @eof break if size && size <= @rbuffer.size fill_rbuff end ret = consume_rbuff(size) \|\| "" if buf buf.replace(ret) ret = buf end (size && ret.empty?) ? nil : ret end ## # Reads at most +maxlen+ bytes from the stream. If +buf+ is provided it # must reference a string which will receive the data. # # See IO#readpartial for full details. def readpartial(maxlen, buf=nil) if maxlen == 0 if buf buf.clear return buf else return "" end end if @rbuffer.empty? begin return sysread(maxlen, buf) rescue Errno::EAGAIN retry end end ret = consume_rbuff(maxlen) if buf buf.replace(ret) ret = buf end raise EOFError if ret.empty? ret end ## # Reads at most +maxlen+ bytes in the non-blocking manner. # # When no data can be read without blocking it raises # OpenSSL::SSL::SSLError extended by IO::WaitReadable or IO::WaitWritable. # # IO::WaitReadable means SSL needs to read internally so read_nonblock # should be called again when the underlying IO is readable. # # IO::WaitWritable means SSL needs to write internally so read_nonblock # should be called again after the underlying IO is writable. # # OpenSSL::Buffering#read_nonblock needs two rescue clause as follows: # # # emulates blocking read (readpartial). # begin # result = ssl.read_nonblock(maxlen) # rescue IO::WaitReadable # IO.select([io]) # retry # rescue IO::WaitWritable # IO.select(nil, [io]) # retry # end # # Note that one reason that read_nonblock writes to the underlying IO is # when the peer requests a new TLS/SSL handshake. See openssl the FAQ for # more details. http://www.openssl.org/support/faq.html def read_nonblock(maxlen, buf=nil, exception: true) if maxlen == 0 if buf buf.clear return buf else return "" end end if @rbuffer.empty? return sysread_nonblock(maxlen, buf, exception: exception) end ret = consume_rbuff(maxlen) if buf buf.replace(ret) ret = buf end raise EOFError if ret.empty? ret end ## # Reads the next "line+ from the stream. Lines are separated by +eol+. If # +limit+ is provided the result will not be longer than the given number of # bytes. # # +eol+ may be a String or Regexp. # # Unlike IO#gets the line read will not be assigned to +$_+. # # Unlike IO#gets the separator must be provided if a limit is provided. def gets(eol=$/, limit=nil) idx = @rbuffer.index(eol) until @eof break if idx fill_rbuff idx = @rbuffer.index(eol) end if eol.is_a?(Regexp) size = idx ? idx+$&.size : nil else size = idx ? idx+eol.size : nil end if size && limit && limit >= 0 size = [size, limit].min end consume_rbuff(size) end ## # Executes the block for every line in the stream where lines are separated # by +eol+. # # See also #gets def each(eol=$/) while line = self.gets(eol) yield line end end alias each_line each ## # Reads lines from the stream which are separated by +eol+. # # See also #gets def readlines(eol=$/) ary = [] while line = self.gets(eol) ary << line end ary end ## # Reads a line from the stream which is separated by +eol+. # # Raises EOFError if at end of file. def readline(eol=$/) raise EOFError if eof? gets(eol) end ## # Reads one character from the stream. Returns nil if called at end of # file. def getc read(1) end ## # Calls the given block once for each byte in the stream. def each_byte # :yields: byte while c = getc yield(c.ord) end end ## # Reads a one-character string from the stream. Raises an EOFError at end # of file. def readchar raise EOFError if eof? getc end ## # Pushes character +c+ back onto the stream such that a subsequent buffered # character read will return it. # # Unlike IO#getc multiple bytes may be pushed back onto the stream. # # Has no effect on unbuffered reads (such as #sysread). def ungetc(c) @rbuffer[0,0] = c.chr end ## # Returns true if the stream is at file which means there is no more data to # be read. def eof? fill_rbuff if !@eof && @rbuffer.empty? @eof && @rbuffer.empty? end alias eof eof? # # for writing. # private ## # Writes +s+ to the buffer. When the buffer is full or #sync is true the # buffer is flushed to the underlying socket. def do_write(s) @wbuffer = "" unless defined? @wbuffer @wbuffer << s @wbuffer.force_encoding(Encoding::BINARY) @sync \|\|= false if @sync or @wbuffer.size > BLOCK_SIZE or idx = @wbuffer.rindex($/) remain = idx ? idx + $/.size : @wbuffer.length nwritten = 0 while remain > 0 str = @wbuffer[nwritten,remain] begin nwrote = syswrite(str) rescue Errno::EAGAIN retry end remain -= nwrote nwritten += nwrote end @wbuffer[0,nwritten] = "" end end public ## # Writes +s+ to the stream. If the argument is not a string it will be # converted using String#to_s. Returns the number of bytes written. def write(s) do_write(s) s.bytesize end ## # Writes +str+ in the non-blocking manner. # # If there is buffered data, it is flushed first. This may block. # # write_nonblock returns number of bytes written to the SSL connection. # # When no data can be written without blocking it raises # OpenSSL::SSL::SSLError extended by IO::WaitReadable or IO::WaitWritable. # # IO::WaitReadable means SSL needs to read internally so write_nonblock # should be called again after the underlying IO is readable. # # IO::WaitWritable means SSL needs to write internally so write_nonblock # should be called again after underlying IO is writable. # # So OpenSSL::Buffering#write_nonblock needs two rescue clause as follows. # # # emulates blocking write. # begin # result = ssl.write_nonblock(str) # rescue IO::WaitReadable # IO.select([io]) # retry # rescue IO::WaitWritable # IO.select(nil, [io]) # retry # end # # Note that one reason that write_nonblock reads from the underlying IO # is when the peer requests a new TLS/SSL handshake. See the openssl FAQ # for more details. http://www.openssl.org/support/faq.html def write_nonblock(s, exception: true) flush syswrite_nonblock(s, exception: exception) end ## # Writes +s+ to the stream. +s+ will be converted to a String using # String#to_s. def << (s) do_write(s) self end ## # Writes +args+ to the stream along with a record separator. # # See IO#puts for full details. def puts(args) s = "" if args.empty? s << "\n" end args.each{\|arg\| s << arg.to_s if $/ && /\n\z/ !~ s s << "\n" end } do_write(s) nil end ## # Writes +args+ to the stream. # # See IO#print for full details. def print(args) s = "" args.each{ \|arg\| s << arg.to_s } do_write(s) nil end ## # Formats and writes to the stream converting parameters under control of # the format string. # # See Kernel#sprintf for format string details. def printf(s, *args) do_write(s % args) nil end ## # Flushes buffered data to the SSLSocket. def flush osync = @sync @sync = true do_write "" return self ensure @sync = osync end ## # Closes the SSLSocket and flushes any unwritten data. def close flush rescue nil sysclose end end Back

Edit File : buffering.rb | Size : 9.39 KB

# coding: binary
# frozen_string_literal: false
#--
#= Info
#  'OpenSSL for Ruby 2' project
#  Copyright (C) 2001 GOTOU YUUZOU <gotoyuzo@notwork.org>
#  All rights reserved.
#
#= Licence
#  This program is licensed under the same licence as Ruby.
#  (See the file 'LICENCE'.)
#++

##
# OpenSSL IO buffering mix-in module.
#
# This module allows an OpenSSL::SSL::SSLSocket to behave like an IO.
#
# You typically won't use this module directly, you can see it implemented in
# OpenSSL::SSL::SSLSocket.

module OpenSSL::Buffering
  include Enumerable

##
  # The "sync mode" of the SSLSocket.
  #
  # See IO#sync for full details.

attr_accessor :sync

##
  # Default size to read from or write to the SSLSocket for buffer operations.

BLOCK_SIZE = 1024*16

##
  # Creates an instance of OpenSSL's buffering IO module.

def initialize(*)
    super
    @eof = false
    @rbuffer = ""
    @sync = @io.sync
  end

#
  # for reading.
  #
  private

##
  # Fills the buffer from the underlying SSLSocket

def fill_rbuff
    begin
      @rbuffer << self.sysread(BLOCK_SIZE)
    rescue Errno::EAGAIN
      retry
    rescue EOFError
      @eof = true
    end
  end

##
  # Consumes +size+ bytes from the buffer

def consume_rbuff(size=nil)
    if @rbuffer.empty?
      nil
    else
      size = @rbuffer.size unless size
      ret = @rbuffer[0, size]
      @rbuffer[0, size] = ""
      ret
    end
  end

public

##
  # Reads +size+ bytes from the stream.  If +buf+ is provided it must
  # reference a string which will receive the data.
  #
  # See IO#read for full details.

def read(size=nil, buf=nil)
    if size == 0
      if buf
        buf.clear
        return buf
      else
        return ""
      end
    end
    until @eof
      break if size && size <= @rbuffer.size
      fill_rbuff
    end
    ret = consume_rbuff(size) || ""
    if buf
      buf.replace(ret)
      ret = buf
    end
    (size && ret.empty?) ? nil : ret
  end

##
  # Reads at most +maxlen+ bytes from the stream.  If +buf+ is provided it
  # must reference a string which will receive the data.
  #
  # See IO#readpartial for full details.

def readpartial(maxlen, buf=nil)
    if maxlen == 0
      if buf
        buf.clear
        return buf
      else
        return ""
      end
    end
    if @rbuffer.empty?
      begin
        return sysread(maxlen, buf)
      rescue Errno::EAGAIN
        retry
      end
    end
    ret = consume_rbuff(maxlen)
    if buf
      buf.replace(ret)
      ret = buf
    end
    raise EOFError if ret.empty?
    ret
  end

##
  # Reads at most +maxlen+ bytes in the non-blocking manner.
  #
  # When no data can be read without blocking it raises
  # OpenSSL::SSL::SSLError extended by IO::WaitReadable or IO::WaitWritable.
  #
  # IO::WaitReadable means SSL needs to read internally so read_nonblock
  # should be called again when the underlying IO is readable.
  #
  # IO::WaitWritable means SSL needs to write internally so read_nonblock
  # should be called again after the underlying IO is writable.
  #
  # OpenSSL::Buffering#read_nonblock needs two rescue clause as follows:
  #
  #   # emulates blocking read (readpartial).
  #   begin
  #     result = ssl.read_nonblock(maxlen)
  #   rescue IO::WaitReadable
  #     IO.select([io])
  #     retry
  #   rescue IO::WaitWritable
  #     IO.select(nil, [io])
  #     retry
  #   end
  #
  # Note that one reason that read_nonblock writes to the underlying IO is
  # when the peer requests a new TLS/SSL handshake.  See openssl the FAQ for
  # more details.  http://www.openssl.org/support/faq.html

def read_nonblock(maxlen, buf=nil, exception: true)
    if maxlen == 0
      if buf
        buf.clear
        return buf
      else
        return ""
      end
    end
    if @rbuffer.empty?
      return sysread_nonblock(maxlen, buf, exception: exception)
    end
    ret = consume_rbuff(maxlen)
    if buf
      buf.replace(ret)
      ret = buf
    end
    raise EOFError if ret.empty?
    ret
  end

##
  # Reads the next "line+ from the stream.  Lines are separated by +eol+.  If
  # +limit+ is provided the result will not be longer than the given number of
  # bytes.
  #
  # +eol+ may be a String or Regexp.
  #
  # Unlike IO#gets the line read will not be assigned to +$_+.
  #
  # Unlike IO#gets the separator must be provided if a limit is provided.

def gets(eol=$/, limit=nil)
    idx = @rbuffer.index(eol)
    until @eof
      break if idx
      fill_rbuff
      idx = @rbuffer.index(eol)
    end
    if eol.is_a?(Regexp)
      size = idx ? idx+$&.size : nil
    else
      size = idx ? idx+eol.size : nil
    end
    if size && limit && limit >= 0
      size = [size, limit].min
    end
    consume_rbuff(size)
  end

##
  # Executes the block for every line in the stream where lines are separated
  # by +eol+.
  #
  # See also #gets

def each(eol=$/)
    while line = self.gets(eol)
      yield line
    end
  end
  alias each_line each

##
  # Reads lines from the stream which are separated by +eol+.
  #
  # See also #gets

def readlines(eol=$/)
    ary = []
    while line = self.gets(eol)
      ary << line
    end
    ary
  end

##
  # Reads a line from the stream which is separated by +eol+.
  #
  # Raises EOFError if at end of file.

def readline(eol=$/)
    raise EOFError if eof?
    gets(eol)
  end

##
  # Reads one character from the stream.  Returns nil if called at end of
  # file.

def getc
    read(1)
  end

##
  # Calls the given block once for each byte in the stream.

def each_byte # :yields: byte
    while c = getc
      yield(c.ord)
    end
  end

##
  # Reads a one-character string from the stream.  Raises an EOFError at end
  # of file.

def readchar
    raise EOFError if eof?
    getc
  end

##
  # Pushes character +c+ back onto the stream such that a subsequent buffered
  # character read will return it.
  #
  # Unlike IO#getc multiple bytes may be pushed back onto the stream.
  #
  # Has no effect on unbuffered reads (such as #sysread).

def ungetc(c)
    @rbuffer[0,0] = c.chr
  end

##
  # Returns true if the stream is at file which means there is no more data to
  # be read.

def eof?
    fill_rbuff if !@eof && @rbuffer.empty?
    @eof && @rbuffer.empty?
  end
  alias eof eof?

#
  # for writing.
  #
  private

##
  # Writes +s+ to the buffer.  When the buffer is full or #sync is true the
  # buffer is flushed to the underlying socket.

def do_write(s)
    @wbuffer = "" unless defined? @wbuffer
    @wbuffer << s
    @wbuffer.force_encoding(Encoding::BINARY)
    @sync ||= false
    if @sync or @wbuffer.size > BLOCK_SIZE or idx = @wbuffer.rindex($/)
      remain = idx ? idx + $/.size : @wbuffer.length
      nwritten = 0
      while remain > 0
        str = @wbuffer[nwritten,remain]
        begin
          nwrote = syswrite(str)
        rescue Errno::EAGAIN
          retry
        end
        remain -= nwrote
        nwritten += nwrote
      end
      @wbuffer[0,nwritten] = ""
    end
  end

public

##
  # Writes +s+ to the stream.  If the argument is not a string it will be
  # converted using String#to_s.  Returns the number of bytes written.

def write(s)
    do_write(s)
    s.bytesize
  end

##
  # Writes +str+ in the non-blocking manner.
  #
  # If there is buffered data, it is flushed first.  This may block.
  #
  # write_nonblock returns number of bytes written to the SSL connection.
  #
  # When no data can be written without blocking it raises
  # OpenSSL::SSL::SSLError extended by IO::WaitReadable or IO::WaitWritable.
  #
  # IO::WaitReadable means SSL needs to read internally so write_nonblock
  # should be called again after the underlying IO is readable.
  #
  # IO::WaitWritable means SSL needs to write internally so write_nonblock
  # should be called again after underlying IO is writable.
  #
  # So OpenSSL::Buffering#write_nonblock needs two rescue clause as follows.
  #
  #   # emulates blocking write.
  #   begin
  #     result = ssl.write_nonblock(str)
  #   rescue IO::WaitReadable
  #     IO.select([io])
  #     retry
  #   rescue IO::WaitWritable
  #     IO.select(nil, [io])
  #     retry
  #   end
  #
  # Note that one reason that write_nonblock reads from the underlying IO
  # is when the peer requests a new TLS/SSL handshake.  See the openssl FAQ
  # for more details.  http://www.openssl.org/support/faq.html

def write_nonblock(s, exception: true)
    flush
    syswrite_nonblock(s, exception: exception)
  end

##
  # Writes +s+ to the stream.  +s+ will be converted to a String using
  # String#to_s.

def << (s)
    do_write(s)
    self
  end

##
  # Writes +args+ to the stream along with a record separator.
  #
  # See IO#puts for full details.

def puts(*args)
    s = ""
    if args.empty?
      s << "\n"
    end
    args.each{|arg|
      s << arg.to_s
      if $/ && /\n\z/ !~ s
        s << "\n"
      end
    }
    do_write(s)
    nil
  end

##
  # Writes +args+ to the stream.
  #
  # See IO#print for full details.

def print(*args)
    s = ""
    args.each{ |arg| s << arg.to_s }
    do_write(s)
    nil
  end

##
  # Formats and writes to the stream converting parameters under control of
  # the format string.
  #
  # See Kernel#sprintf for format string details.

def printf(s, *args)
    do_write(s % args)
    nil
  end

##
  # Flushes buffered data to the SSLSocket.

def flush
    osync = @sync
    @sync = true
    do_write ""
    return self
  ensure
    @sync = osync
  end

##
  # Closes the SSLSocket and flushes any unwritten data.

def close
    flush rescue nil
    sysclose
  end
end

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