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