Class: Ionian::Socket

Inherits:

Object

• Object
• Ionian::Socket

show all

Defined in:

lib/ionian/socket.rb

Overview

Instance Attribute Summary (collapse)

• - (Object) bind_port readonly

  Local port number.

• - (Object) host readonly

  IP address or URL of server.

• - (Object) port readonly

  Remote port number.

• - (Object) protocol (also: #protocol?) readonly

  Returns a symbol of the type of protocol this socket uses: :tcp, :udp, :unix.

Instance Method Summary (collapse)

• - (Boolean) closed?

  Returns true if the socket is closed.

• - (Object) cmd(string, **kwargs, &block)

  Send a command (data) to the socket.

• - (Object) expression

  Returns the regular expression used to match incoming data.

• - (Object) expression=(exp)

  Set the regular expression used to match incoming data.

• - (Object) flush

  Flushes buffered data to the operating system.

• - (Boolean) has_data?(**kwargs)

  Returns true if there is data in the receive buffer.

• - (Socket) initialize(existing_socket = nil, **kwargs) constructor

  Creates a new socket or wraps an existing socket.

• - (Boolean) persistent?

  Returns true if the socket remains open after writing data.

• - (Object) puts(*string)

  Writes the given string(s) to the socket and appends a newline character to any string not already ending with one.

• - (Object) register_observer(&block) (also: #on_match)

  Register a block to be called when #run_match receives matched data.

• - (Object) unregister_observer(&block)

  Unregister a block from being called when matched data is received.

• - (Object) write(string) (also: #<<)

  Writes the given string to the socket.

host:       IP or hostname to connect to.
port:       Connection's port number. Default is 23. Unused by :unix protocol.
protocol:   Type of socket to create. :tcp, :udp, :unix. Default is :tcp.
            :udp will be automatically selected for addresses in the multicast range.
persistent: The socket remains open after data is sent if this is true.
            The socket closes after data is sent and a packet is received
            if this is false. Default is true.
bind_port:  Local UDP port to bind to for receiving data, if different than
            the remote port being connected to.
reuse_addr: Set true to enable the SO_REUSEADDR flag. Allows local address reuse.
no_delay:   Set true to enable the TCP_NODELAY flag. Disables Nagle algorithm.
cork:       Set true to enable the TCP_CORK flag. Buffers multiple writes
            into one segment.
expression: Overrides the #read_match regular expression for received data.

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# File 'lib/ionian/socket.rb', line 34

def initialize existing_socket = nil, **kwargs
  @socket = existing_socket
  
  @ionian_listeners = []
  
  @expression = kwargs.fetch :expression, nil
  
  if existing_socket
    # Convert existing socket.
    @socket.extend Ionian::Extension::IO
    @socket.extend Ionian::Extension::Socket
    
    if existing_socket.is_a? UNIXSocket
      @host = existing_socket.path
      @port = nil
    else
      @host = existing_socket.remote_address.ip_address if existing_socket
      @port = existing_socket.remote_address.ip_port if existing_socket
    end
  
    if @socket.is_a? TCPSocket
      @protocol = :tcp
    elsif @socket.is_a? UDPSocket
      @protocol = :udp
    elsif @socket.is_a? UNIXSocket
      @protocol = :unix
    end
    
    @persistent     = true # Existing sockets are always persistent.
    
    @socket.expression = @expression if @expression
    
    initialize_socket_methods
    
  else
    # Initialize new socket.
    
    # Parse host out of "host:port" if specified.
    host_port_ary   = kwargs.fetch(:host).to_s.split ':'
    
    @host           = host_port_ary[0]
    @port           = kwargs.fetch :port, host_port_ary[1].to_i || 23
    @bind_port      = kwargs.fetch :bind_port,  @port
    
    # Automatically select UDP for the multicast range. Otherwise default to TCP.
    default_protocol = :tcp
    default_protocol = :udp  if Ionian::Extension::Socket.multicast? @host
    default_protocol = :unix if @host.start_with? '/'
    
    @protocol       = kwargs.fetch :protocol,   default_protocol
    @persistent     = kwargs.fetch :persistent, true
    @persistent     = true if @protocol == :udp
    
    @reuse_addr     = kwargs.fetch :reuse_addr, false
    @no_delay       = kwargs.fetch :no_delay,   false
    @cork           = kwargs.fetch :cork,       false
  
    
    create_socket if @persistent
  end
end

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# File 'lib/ionian/socket.rb', line 15

def bind_port
  @bind_port
end

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# File 'lib/ionian/socket.rb', line 9

def host
  @host
end

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# File 'lib/ionian/socket.rb', line 12

def port
  @port
end

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# File 'lib/ionian/socket.rb', line 98

def protocol
  @protocol
end

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# File 'lib/ionian/socket.rb', line 169

def closed?
  return true unless @socket
  @socket.closed?
end

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# File 'lib/ionian/socket.rb', line 121

def cmd string, **kwargs, &block
  create_socket unless @persistent
  
  if @protocol == :udp
    @socket.send string, 0
  else
    @socket.write string
  end
  
  @socket.flush
  
  matches = @socket.read_match(kwargs) { |match| yield match if block_given? }
  @socket.close unless @persistent
  
  matches
end

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# File 'lib/ionian/socket.rb', line 102

def expression
  @expression || @socket.expression
end

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# File 'lib/ionian/socket.rb', line 107

def expression= exp
  @expression = exp
  @socket.expression = exp if @socket
end

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# File 'lib/ionian/socket.rb', line 176

def flush
  @socket.flush if @persistent
end

Timeout: Number of seconds to wait for data until
  giving up. Set to nil for blocking.

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# File 'lib/ionian/socket.rb', line 163

def has_data? **kwargs
  return false unless @socket
  @socket.has_data? kwargs
end

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# File 'lib/ionian/socket.rb', line 113

def persistent?
  @persistent == false || @persistent == nil ? false : true
end

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# File 'lib/ionian/socket.rb', line 182

def puts *string
  self.write string.map{ |s| s.chomp }.join("\n") + "\n"
end

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# File 'lib/ionian/socket.rb', line 142

def register_observer &block
  @ionian_listeners << block unless @ionian_listeners.include? block
  @socket.register_observer &block if @socket
  block
end

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# File 'lib/ionian/socket.rb', line 151

def unregister_observer &block
  @ionian_listeners.delete_if { |o| o == block }
  @socket.unregister_observer &block if @socket
  block
end

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# File 'lib/ionian/socket.rb', line 188

def write string
  create_socket unless @persistent
  
  num_bytes = 0
  
  if @protocol == :udp
    num_bytes = @socket.send string, 0
  else
    num_bytes = @socket.write string
  end
  
  unless @persistent
    # Read in data to prevent RST packets.
    has_data = ::IO.select [@socket], nil, nil, 0
    @socket.readpartial 0xFFFF if has_data
    
    @socket.close
  end
  
  num_bytes
end