Class: Protocol::HTTP::Body::Stream

Inherits:
Object
  • Object
show all
Defined in:
lib/protocol/http/body/stream.rb

Overview

The input stream is an IO-like object which contains the raw HTTP POST data. When applicable, its external encoding must be “ASCII-8BIT” and it must be opened in binary mode, for Ruby 1.9 compatibility. The input stream must respond to gets, each, read and rewind.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input, output = Buffered.new) ⇒ Stream

Returns a new instance of Stream.

Raises:

  • (ArgumentError) 


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# File 'lib/protocol/http/body/stream.rb', line 30

def initialize(input, output = Buffered.new)
	@input = input
	@output = output
	
	raise ArgumentError, "Non-writable output!" unless output.respond_to?(:write)
	
	# Will hold remaining data in `#read`.
	@buffer = nil
	@closed = false
end

Instance Attribute Details

#input ⇒ Object (readonly)

Returns the value of attribute input.



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# File 'lib/protocol/http/body/stream.rb', line 41

def input
  @input
end

#output ⇒ Object (readonly)

Returns the value of attribute output.



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# File 'lib/protocol/http/body/stream.rb', line 42

def output
  @output
end

Instance Method Details

#close(error = nil) ⇒ Object

Close the input and output bodies.



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# File 'lib/protocol/http/body/stream.rb', line 164

def close(error = nil)
	self.close_read
	self.close_write

	return nil
ensure
	@closed = true
end

#close_read ⇒ Object 



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# File 'lib/protocol/http/body/stream.rb', line 152

def close_read
	@input&.close
	@input = nil
end

#close_write ⇒ Object

close must never be called on the input stream. huh?



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# File 'lib/protocol/http/body/stream.rb', line 158

def close_write
	@output&.close
	@output = nil
end

#closed? ⇒ Boolean

Whether the stream has been closed.

Returns:

  • (Boolean) 


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# File 'lib/protocol/http/body/stream.rb', line 174

def closed?
	@closed
end

#empty? ⇒ Boolean

Whether there are any output chunks remaining?

Returns:

  • (Boolean) 


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# File 'lib/protocol/http/body/stream.rb', line 179

def empty?
	@output.empty?
end

#flush ⇒ Object 



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# File 'lib/protocol/http/body/stream.rb', line 149

def flush
end

#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 51

def read(length = nil, buffer = nil)
	return '' if length == 0
	
	buffer ||= Async::IO::Buffer.new

	# Take any previously buffered data and replace it into the given buffer.
	if @buffer
		buffer.replace(@buffer)
		@buffer = nil
	end
	
	if length
		while buffer.bytesize < length and chunk = read_next
			buffer << chunk
		end
		
		# This ensures the subsequent `slice!` works correctly.
		buffer.force_encoding(Encoding::BINARY)

		# This will be at least one copy:
		@buffer = buffer.byteslice(length, buffer.bytesize)
		
		# This should be zero-copy:
		buffer.slice!(length)
		
		if buffer.empty?
			return nil
		else
			return buffer
		end
	else
		while chunk = read_next
			buffer << chunk
		end
		
		return buffer
	end
end

#read_nonblock(length, buffer = nil) ⇒ Object 



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# File 'lib/protocol/http/body/stream.rb', line 112

def read_nonblock(length, buffer = nil)
	@buffer ||= read_next
	chunk = nil
	
	unless @buffer
		buffer&.clear
		return
	end
	
	if @buffer.bytesize > length
		chunk = @buffer.byteslice(0, length)
		@buffer = @buffer.byteslice(length, @buffer.bytesize)
	else
		chunk = @buffer
		@buffer = nil
	end
	
	if buffer
		buffer.replace(chunk)
	else
		buffer = chunk
	end
	
	return buffer
end

#read_partial(length = nil) ⇒ Object

Read at most ‘length` bytes from the stream. Will avoid reading from the underlying stream if possible.



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# File 'lib/protocol/http/body/stream.rb', line 91

def read_partial(length = nil)
	if @buffer
		buffer = @buffer
		@buffer = nil
	else
		buffer = read_next
	end
	
	if buffer and length
		if buffer.bytesize > length
			# This ensures the subsequent `slice!` works correctly.
			buffer.force_encoding(Encoding::BINARY)

			@buffer = buffer.byteslice(length, buffer.bytesize)
			buffer.slice!(length)
		end
	end
	
	return buffer
end

#write(buffer) ⇒ Object Also known as: write_nonblock 



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# File 'lib/protocol/http/body/stream.rb', line 138

def write(buffer)
	if @output
		@output.write(buffer)
		return buffer.bytesize
	else
		raise IOError, "Stream is not writable, output has been closed!"
	end
end