Module: OpenSSL::Buffering
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Defined in: | ext/openssl/lib/openssl/buffering.rb |
Overview
::OpenSSL
IO buffering mix-in module.
This module allows an SSL::SSLSocket
to behave like an ::IO
.
You typically won’t use this module directly, you can see it implemented in SSL::SSLSocket
.
Constant Summary
-
BLOCK_SIZE =
Default size to read from or write to the SSLSocket for buffer operations.
1024*16
Instance Attribute Summary
Instance Method Summary
-
#<<(s)
Writes s to the stream.
-
#close
Closes the SSLSocket and flushes any unwritten data.
-
#each(eol = $/)
(also: #each_line)
Executes the block for every line in the stream where lines are separated by eol.
-
#each_byte
Calls the given block once for each byte in the stream.
-
#each_line(eol = $/)
Alias for #each.
-
#eof? ⇒ Boolean
(also: #eof)
readonly
Returns true if the stream is at file which means there is no more data to be read.
-
#flush
Flushes buffered data to the SSLSocket.
-
#getc
Reads one character from the stream.
-
#gets(eol = $/, limit = nil)
Reads the next “line” from the stream.
-
#initialize
Creates an instance of OpenSSL’s buffering
::IO
module. -
#print(*args)
Writes args to the stream.
-
#printf(s, *args)
Formats and writes to the stream converting parameters under control of the format string.
-
#puts(*args)
Writes args to the stream along with a record separator.
-
#read(size = nil, buf = nil)
Reads size bytes from the stream.
-
#read_nonblock(maxlen, buf = nil, exception: true)
Reads at most maxlen bytes in the non-blocking manner.
-
#readchar
Reads a one-character string from the stream.
-
#readline(eol = $/)
Reads a line from the stream which is separated by eol.
-
#readlines(eol = $/)
Reads lines from the stream which are separated by eol.
-
#readpartial(maxlen, buf = nil)
Reads at most maxlen bytes from the stream.
-
#ungetc(c)
Pushes character c back onto the stream such that a subsequent buffered character read will return it.
-
#write(*s)
Writes s to the stream.
-
#write_nonblock(s, exception: true)
Writes s in the non-blocking manner.
-
#consume_rbuff(size = nil)
private
Consumes size bytes from the buffer.
-
#do_write(s)
private
Writes s to the buffer.
-
#fill_rbuff
private
Fills the buffer from the underlying SSLSocket.
Instance Attribute Details
#eof (readonly)
Alias for #eof?.
# File 'ext/openssl/lib/openssl/buffering.rb', line 326
alias eof eof?
#sync (rw)
The “sync mode” of the SSLSocket.
See IO#sync
for full details.
# File 'ext/openssl/lib/openssl/buffering.rb', line 53
attr_accessor :sync
Instance Method Details
#<<(s)
Writes s to the stream. s will be converted to a String using .to_s
method.
# File 'ext/openssl/lib/openssl/buffering.rb', line 413
def <<(s) do_write(s) self end
#close
Closes the SSLSocket and flushes any unwritten data.
# File 'ext/openssl/lib/openssl/buffering.rb', line 474
def close flush rescue nil sysclose end
#consume_rbuff(size = nil) (private)
Consumes size bytes from the buffer
# File 'ext/openssl/lib/openssl/buffering.rb', line 91
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
#do_write(s) (private)
Writes s to the buffer. When the buffer is full or #sync is true the buffer is flushed to the underlying socket.
# File 'ext/openssl/lib/openssl/buffering.rb', line 337
def do_write(s) @wbuffer = Buffer.new unless defined? @wbuffer @wbuffer << s @wbuffer.force_encoding(Encoding::BINARY) @sync ||= false if @sync or @wbuffer.size > BLOCK_SIZE until @wbuffer.empty? begin nwrote = syswrite(@wbuffer) rescue Errno::EAGAIN retry end @wbuffer[0, nwrote] = "" end end end
#each(eol = $/) Also known as: #each_line
Executes the block for every line in the stream where lines are separated by eol.
See also #gets
# File 'ext/openssl/lib/openssl/buffering.rb', line 250
def each(eol=$/) while line = self.gets(eol) yield line end end
#each_byte
Calls the given block once for each byte in the stream.
# File 'ext/openssl/lib/openssl/buffering.rb', line 291
def each_byte # :yields: byte while c = getc yield(c.ord) end end
#each_line(eol = $/)
Alias for #each.
# File 'ext/openssl/lib/openssl/buffering.rb', line 255
alias each_line each
#eof? ⇒ Boolean
(readonly)
Also known as: #eof
Returns true if the stream is at file which means there is no more data to be read.
# File 'ext/openssl/lib/openssl/buffering.rb', line 322
def eof? fill_rbuff if !@eof && @rbuffer.empty? @eof && @rbuffer.empty? end
#fill_rbuff (private)
Fills the buffer from the underlying SSLSocket
# File 'ext/openssl/lib/openssl/buffering.rb', line 78
def fill_rbuff begin @rbuffer << self.sysread(BLOCK_SIZE) rescue Errno::EAGAIN retry rescue EOFError @eof = true end end
#flush
Flushes buffered data to the SSLSocket.
# File 'ext/openssl/lib/openssl/buffering.rb', line 462
def flush osync = @sync @sync = true do_write "" return self ensure @sync = osync end
#getc
Reads one character from the stream. Returns nil if called at end of file.
# File 'ext/openssl/lib/openssl/buffering.rb', line 284
def getc read(1) end
#gets(eol = $/, limit = nil)
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 $_.
Unlike IO#gets
the separator must be provided if a limit is provided.
# File 'ext/openssl/lib/openssl/buffering.rb', line 226
def gets(eol=$/, 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
#initialize
Creates an instance of OpenSSL’s buffering ::IO
module.
#print(*args)
Writes args to the stream.
See IO#print
for full details.
#printf(s, *args)
Formats and writes to the stream converting parameters under control of the format string.
See Kernel.sprintf
for format string details.
# File 'ext/openssl/lib/openssl/buffering.rb', line 454
def printf(s, *args) do_write(s % args) nil end
#puts(*args)
Writes args to the stream along with a record separator.
See IO#puts
for full details.
#read(size = nil, buf = nil)
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 'ext/openssl/lib/openssl/buffering.rb', line 110
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
#read_nonblock(maxlen, buf = nil, exception: true)
Reads at most maxlen bytes in the non-blocking manner.
When no data can be read without blocking it raises 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.
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 'ext/openssl/lib/openssl/buffering.rb', line 195
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
#readchar
Reads a one-character string from the stream. Raises an EOFError at end of file.
#readline(eol = $/)
Reads a line from the stream which is separated by eol.
Raises EOFError if at end of file.
#readlines(eol = $/)
Reads lines from the stream which are separated by eol.
See also #gets
# File 'ext/openssl/lib/openssl/buffering.rb', line 262
def readlines(eol=$/) ary = [] while line = self.gets(eol) ary << line end ary end
#readpartial(maxlen, buf = nil)
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 'ext/openssl/lib/openssl/buffering.rb', line 137
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
#ungetc(c)
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 'ext/openssl/lib/openssl/buffering.rb', line 314
def ungetc(c) @rbuffer[0,0] = c.chr end
#write(*s)
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 'ext/openssl/lib/openssl/buffering.rb', line 360
def write(*s) s.inject(0) do |written, str| do_write(str) written + str.bytesize end end
#write_nonblock(s, exception: true)
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 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 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 'ext/openssl/lib/openssl/buffering.rb', line 404
def write_nonblock(s, exception: true) flush syswrite_nonblock(s, exception: exception) end