Class: NATS::Protocol::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/nats/io/parser.rb

Instance Method Summary collapse

Constructor Details

#initialize(nc) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/nats/io/parser.rb', line 40

def initialize(nc)
  @nc = nc
  reset!
end

Instance Method Details

#parse(data) ⇒ Object 



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# File 'lib/nats/io/parser.rb', line 56

def parse(data)
  @buf = @buf ? @buf << data : data
  while (@buf)
    case @parse_state
    when AWAITING_CONTROL_LINE
      case @buf
      when MSG
        @buf = $'
        @sub, @sid, @reply, @needed = $1, $2.to_i, $4, $5.to_i
        @parse_state = AWAITING_MSG_PAYLOAD
      when HMSG
        @buf = $'
        @sub, @sid, @reply, @header_needed, @needed = $1, $2.to_i, $4, $5.to_i, $6.to_i
        @parse_state = AWAITING_MSG_PAYLOAD
      when OK # No-op right now
        @buf = $'
      when ERR
        @buf = $'
        @nc.send(:process_err, $1)
      when PING
        @buf = $'
        @nc.send(:process_ping)
      when PONG
        @buf = $'
        @nc.send(:process_pong)
      when INFO
        @buf = $'
        # First INFO message is processed synchronously on connect,
        # and onwards we would be receiving asynchronously INFO commands
        # signaling possible changes in the topology of the NATS cluster.
        @nc.send(:process_info, $1)
      when UNKNOWN
        @buf = $'
        @nc.send(:process_err, "Unknown protocol: #{$1}")
      else
        # If we are here we do not have a complete line yet that we understand.
        return
      end
      @buf = nil if (@buf && @buf.empty?)

    when AWAITING_MSG_PAYLOAD
      return unless (@needed && @buf.bytesize >= (@needed + CR_LF_SIZE))
      if @header_needed
        hbuf = @buf.slice(0, @header_needed)
        payload = @buf.slice(@header_needed, (@needed-@header_needed))
        @nc.send(:process_msg, @sub, @sid, @reply, payload, hbuf)
        @buf = @buf.slice((@needed + CR_LF_SIZE), @buf.bytesize)
      else
        @nc.send(:process_msg, @sub, @sid, @reply, @buf.slice(0, @needed), nil)
        @buf = @buf.slice((@needed + CR_LF_SIZE), @buf.bytesize)
      end

      @sub = @sid = @reply = @needed = @header_needed = nil
      @parse_state = AWAITING_CONTROL_LINE
      @buf = nil if (@buf && @buf.empty?)
    end
  end
end

#reset! ⇒ Object 



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# File 'lib/nats/io/parser.rb', line 45

def reset!
  @buf = nil
  @parse_state = AWAITING_CONTROL_LINE

  @sub = nil
  @sid = nil
  @reply = nil
  @needed = nil
  @header_needed = nil
end