Method: Protocol::HTTP::Body::Stream#read

Defined in:
lib/protocol/http/body/stream.rb

#read(length = nil, buffer = nil) ⇒ Object

read behaves like IO#read. Its signature is read([length, [buffer]]). If given, length must be a non-negative Integer (>= 0) or nil, and buffer must be a String and may not be nil. If length is given and not nil, then this method reads at most length bytes from the input stream. If length is not given or nil, then this method reads all data until EOF. When EOF is reached, this method returns nil if length is given and not nil, or “” if length is not given or is nil. If buffer is given, then the read data will be placed into buffer instead of a newly created String object.

Parameters:

  • length (Integer) (defaults to: nil) —

    the amount of data to read

  • buffer (String) (defaults to: nil) —

    the buffer which will receive the data

Returns:

  • a buffer containing the data



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# File 'lib/protocol/http/body/stream.rb', line 45

def read(length = nil, buffer = nil)
	buffer ||= Async::IO::Buffer.new
	buffer.clear
	
	until buffer.bytesize == length
		@buffer = read_next if @buffer.nil?
		break if @buffer.nil?
		
		remaining_length = length - buffer.bytesize if length
		
		if remaining_length && remaining_length < @buffer.bytesize
			# We know that we are not going to reuse the original buffer.
			# But byteslice will generate a hidden copy. So let's freeze it first:
			@buffer.freeze
			
			buffer << @buffer.byteslice(0, remaining_length)
			@buffer = @buffer.byteslice(remaining_length, @buffer.bytesize)
		else
			buffer << @buffer
			@buffer = nil
		end
	end
	
	return nil if buffer.empty? && length && length > 0
	
	return buffer
end