Class: Yakr

Inherits:
Object
  • Object
show all
Defined in:
lib/yakr.rb

Constant Summary collapse

VERSION = 
"0.2.4"
REQUIRE_SERVER = 
0.1
USAGE_BANNER = 
"Use `#{File.basename($0)} --help` for available options."

Class Method Summary collapse

Class Method Details

.connect(host, port) ⇒ Object 



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# File 'lib/yakr.rb', line 105

def self.connect(host, port)
	
	begin
		timeout(20) do
			
			puts "Attempting connection.."
			
			# establish connection
			@server = TCPSocket.open(host, port)
			
			# wait for server response
			@line = @server.readline
		end
	
		if @line.start_with?('yakr=>')
			
			puts "yakr: connected to #{host} on port #{port}"
			
			# read from standard input and send
			# text line by line to server
			STDIN.each do |str|
				@server.puts "#{str}"
			end
		else
			puts "host connect: unexpected server response"
			self.exit_with_banner(1)
		end
	
	rescue Interrupt
		puts "\nCancelled, exiting.."
		exit 1
	rescue Timeout::Error => ex
		puts "host connect: timed out"
		self.exit_with_banner(1)
	rescue => e
		puts "host connect: unable to connect #{e}"
		self.exit_with_banner(1)
	ensure
		@server.close unless @server.nil?
	end		
end

.exit_with_banner(x) ⇒ Object 



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# File 'lib/yakr.rb', line 172

def self.exit_with_banner(x)
	puts USAGE_BANNER
	exit x
end

.listen(port, max_lines) ⇒ Object 



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# File 'lib/yakr.rb', line 147

def self.listen(port, max_lines)
	begin
		limit_output = true if max_lines > 0
		@server = TCPServer.open(port)
		loop do
			client = @server.accept
			client.puts "yakr=>version:#{VERSION}"
			client.each do |str|					
				exit 0 if max_lines <= 0 and limit_output
				puts "#{str}"
				max_lines -= 1 if limit_output
			end
		end
	rescue Interrupt
		puts "\nCancelled, exiting.."
		exit 1
	rescue SystemExit
	rescue
		puts "listen server: unable to start"
		exit 1
	ensure
		@server.close unless @server.nil?
	end
end

.run ⇒ Object 



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# File 'lib/yakr.rb', line 37

def self.run
	
	# test for zero arguments
	if ARGV.empty? then
		self.exit_with_banner(1)
	end
	
	# start processing command line arguments
	begin
		options = OptionReader.parse(ARGV)
	rescue OptionParser::InvalidOption => t
		puts t
		self.exit_with_banner(1)
	rescue OptionParser::MissingArgument => m
		puts m
		self.exit_with_banner(1)
	end
	
	# validate mode options
	if (options.connect_host or options.connect_port) and
		 (options.listen_port or options.limit_lines) then
		puts "mode options: specify either listen or connect options"
		self.exit_with_banner(1)
	elsif not (options.connect_host or options.listen_port)
		puts "mode options: specify listen or connect options"
		self.exit_with_banner(1)
	end
	
	# validate server options
	if options.connect_port and not options.connect_host
		puts "host connect: no host specified"
		self.exit_with_banner(1)
	end
	
	if options.connect_host and not options.connect_port
		puts "host connect: no port specified"
		self.exit_with_banner(1)
	end
	
	# validate connection port
	if options.connect_port
		if not (options.connect_port.to_i > 0 and options.connect_port.to_i <= 65535)
			puts "invalid port: #{options.connect_port.to_s}"
			self.exit_with_banner(1)
		end
	end
	
	# validate listen port
	if options.listen_port
		if not (options.listen_port.to_i > 0 and options.listen_port.to_i <= 65535)
			puts "invalid port: #{options.listen_port.to_s}"
			self.exit_with_banner(1)
		end
	end
	
	# validate line limit
	if options.limit_lines and not options.limit_lines.to_i > 0
			puts "invalid max lines: #{options.limit_lines}"
			self.exit_with_banner(1)
	end
	
	if options.connect_host
		connect(options.connect_host, options.connect_port.to_i)
	else
		listen(options.listen_port.to_i, options.limit_lines.to_i)
	end
end