module OpenSSL::Buffering

Creates an instance of OpenSSL’s buffering IO module.

# File lib/openssl/buffering.rb, line 63
def initialize(*)
  super
  @eof = false
  @rbuffer = Buffer.new
  @sync = @io.sync
end

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

# File lib/openssl/buffering.rb, line 434
def <<(s)
  do_write(s)
  self
end

Closes the SSLSocket and flushes any unwritten data.

# File lib/openssl/buffering.rb, line 495
def close
  flush rescue nil
  sysclose
end

Executes the block for every line in the stream where lines are separated by eol.

See also gets

# File lib/openssl/buffering.rb, line 266
def each(eol=$/)
  while line = self.gets(eol)
    yield line
  end
end

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

# File lib/openssl/buffering.rb, line 307
def each_byte # :yields: byte
  while c = getc
    yield(c.ord)
  end
end

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

# File lib/openssl/buffering.rb, line 338
def eof?
  fill_rbuff if !@eof && @rbuffer.empty?
  @eof && @rbuffer.empty?
end

Flushes buffered data to the SSLSocket.

# File lib/openssl/buffering.rb, line 483
def flush
  osync = @sync
  @sync = true
  do_write ""
  return self
ensure
  @sync = osync
end

Get the next 8bit byte from ‘ssl`. Returns `nil` on EOF

# File lib/openssl/buffering.rb, line 106
def getbyte
  read(1)&.ord
end

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

# File lib/openssl/buffering.rb, line 300
def getc
  read(1)
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.

# File lib/openssl/buffering.rb, line 238
def gets(eol=$/, limit=nil, chomp: false)
  idx = @rbuffer.index(eol)
  until @eof
    break if idx
    fill_rbuff
    idx = @rbuffer.index(eol)
  end
  if eol.is_a?(Regexp)
    size = idx ? idx+$&.size : nil
  else
    size = idx ? idx+eol.size : nil
  end
  if size && limit && limit >= 0
    size = [size, limit].min
  end
  line = consume_rbuff(size)
  if chomp && line
    line.chomp!(eol)
  end
  line
end

Writes args to the stream.

See IO#print for full details.

# File lib/openssl/buffering.rb, line 462
def print(*args)
  s = Buffer.new
  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.

# File lib/openssl/buffering.rb, line 475
def printf(s, *args)
  do_write(s % args)
  nil
end

Writes args to the stream along with a record separator.

See IO#puts for full details.

# File lib/openssl/buffering.rb, line 444
def puts(*args)
  s = Buffer.new
  if args.empty?
    s << "\n"
  end
  args.each{|arg|
    s << arg.to_s
    s.sub!(/(?<!\n)\z/, "\n")
  }
  do_write(s)
  nil
end

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.

# File lib/openssl/buffering.rb, line 122
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 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. www.openssl.org/support/faq.html

By specifying a keyword argument exception to false, you can indicate that read_nonblock should not raise an IO::Wait*able exception, but return the symbol :wait_writable or :wait_readable instead. At EOF, it will return nil instead of raising EOFError.

# File lib/openssl/buffering.rb, line 207
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
  ret
end

Get the next 8bit byte. Raises EOFError on EOF

# File lib/openssl/buffering.rb, line 111
def readbyte
  raise EOFError if eof?
  getbyte
end

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

# File lib/openssl/buffering.rb, line 317
def readchar
  raise EOFError if eof?
  getc
end

Reads a line from the stream which is separated by eol.

Raises EOFError if at end of file.

# File lib/openssl/buffering.rb, line 291
def readline(eol=$/)
  raise EOFError if eof?
  gets(eol)
end

Reads lines from the stream which are separated by eol.

See also gets

# File lib/openssl/buffering.rb, line 278
def readlines(eol=$/)
  ary = []
  while line = self.gets(eol)
    ary << line
  end
  ary
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.

# File lib/openssl/buffering.rb, line 149
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
  ret
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).

# File lib/openssl/buffering.rb, line 330
def ungetc(c)
  @rbuffer[0,0] = c.chr
end

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

# File lib/openssl/buffering.rb, line 381
def write(*s)
  s.inject(0) do |written, str|
    do_write(str)
    written + str.bytesize
  end
end

Writes s 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. www.openssl.org/support/faq.html

By specifying a keyword argument exception to false, you can indicate that write_nonblock should not raise an IO::Wait*able exception, but return the symbol :wait_writable or :wait_readable instead.

# File lib/openssl/buffering.rb, line 425
def write_nonblock(s, exception: true)
  flush
  syswrite_nonblock(s, exception: exception)
end