Module: EventMachine::Protocols::LineText2

Included in:
SmtpClient, SmtpServer, Stomp
Defined in:
lib/protocols/linetext2.rb

Constant Summary collapse

MaxLineLength = 
16*1024
MaxBinaryLength = 
32*1024*1024

Instance Method Summary collapse

Instance Method Details

#receive_binary_data(data) ⇒ Object

Stub. Should be subclassed by user code.



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# File 'lib/protocols/linetext2.rb', line 139

def receive_binary_data data
	# no-op
end

#receive_data(data) ⇒ Object

– Will be called recursively until there’s no data to read. That way the user-defined handlers we call can modify the handling characteristics on a per-token basis.



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# File 'lib/protocols/linetext2.rb', line 51

def receive_data data
	return unless (data and data.length > 0)

	# Do this stuff in lieu of a constructor.
	@lt2_mode ||= :lines
	@lt2_delimiter ||= "\n"
	@lt2_linebuffer ||= []

	if @lt2_mode == :lines
		if ix = data.index( @lt2_delimiter )
			@lt2_linebuffer << data[0...ix]
			ln = @lt2_linebuffer.join
			@lt2_linebuffer.clear
			if @lt2_delimiter == "\n"
				ln.chomp!
			end
			receive_line ln
			receive_data data[(ix+@lt2_delimiter.length)..-1]
		else
			@lt2_linebuffer << data
		end
	elsif @lt2_mode == :text
		if @lt2_textsize
			needed = @lt2_textsize - @lt2_textpos
			will_take = if data.length > needed
				needed
			else
				data.length
			end

			@lt2_textbuffer << data[0...will_take]
			tail = data[will_take..-1]

			@lt2_textpos += will_take
			if @lt2_textpos >= @lt2_textsize
				receive_binary_data @lt2_textbuffer.join
				set_line_mode
			end

			receive_data tail
		else
			receive_binary_data data
		end
	end
end

#receive_line(ln) ⇒ Object

Stub. Should be subclassed by user code.



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# File 'lib/protocols/linetext2.rb', line 134

def receive_line ln
	# no-op
end

#set_delimiter(delim) ⇒ Object 



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# File 'lib/protocols/linetext2.rb', line 98

def set_delimiter delim
	@lt2_delimiter = delim.to_s
end

#set_line_mode(data = "") ⇒ Object

Called internally but also exposed to user code, for the case in which processing of binary data creates a need to transition back to line mode. We support an optional parameter to “throw back” some data, which might be an umprocessed chunk of the transmitted binary data, or something else entirely.



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# File 'lib/protocols/linetext2.rb', line 107

def set_line_mode data=""
	@lt2_mode = :lines
	(@lt2_linebuffer ||= []).clear
	receive_data data.to_s
end

#set_text_mode(size = nil) ⇒ Object 



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# File 'lib/protocols/linetext2.rb', line 113

def set_text_mode size=nil
	if size == 0
		set_line_mode
	else
		@lt2_mode = :text
		(@lt2_textbuffer ||= []).clear
		@lt2_textsize = size # which can be nil, signifying no limit
		@lt2_textpos = 0
	end
end

#unbind ⇒ Object

In case of a dropped connection, we’ll send a partial buffer to user code when in sized text mode. User overrides of #receive_binary_data need to be aware that they may get a short buffer.



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# File 'lib/protocols/linetext2.rb', line 127

def unbind
	if @lt2_mode == :text and @lt2_textpos > 0
		receive_binary_data @lt2_textbuffer.join
	end
end