Class: Fyrehose::InputStream

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ InputStream

Returns a new instance of InputStream.



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# File 'lib/fyrehose/input_stream.rb', line 6

def initialize
  @state = -7
  @pos = 0
  @buf = ""
end

Instance Attribute Details

#buf ⇒ Object

Returns the value of attribute buf.



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# File 'lib/fyrehose/input_stream.rb', line 4

def buf
  @buf
end

#pos ⇒ Object

Returns the value of attribute pos.



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# File 'lib/fyrehose/input_stream.rb', line 4

def pos
  @pos
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/fyrehose/input_stream.rb', line 4

def state
  @state
end

Instance Method Details

#<<(chunk) ⇒ Object 



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# File 'lib/fyrehose/input_stream.rb', line 12

def <<(chunk)
  buf << chunk
end

#each ⇒ Object 



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# File 'lib/fyrehose/input_stream.rb', line 16

def each
  trim = 0

  while pos < buf.size do
    case state

      when -7
        self.state += 1
        type = nil
        txid = ""
        channel = ""
        len_or_flags = ""
        body = ""
        next

      when -6
        raise ProtocolError if buf[pos] != "#"
        self.state += 1

      when -3, -5
        if buf[pos] == " "
          self.state += 1
        else
          txid    << buf[pos] if state == -5
          channel << buf[pos] if state == -3
        end

      when -4
        if buf[pos] == "$"
          type = :ack
          self.state = -1
        elsif buf[pos] == "@"
          self.state += 1
        else
          raise ProtocolError
        end

      when -2
        self.state += 1
        if buf[pos] == "*"
          type = :data
        elsif buf[pos] == "+"
          type = :flags
        else
          raise ProtocolError
        end

      when -1
        if buf[pos] == " " || buf[pos] == "\n"
          len_or_flags = len_or_flags.to_i
          if type == :data
            self.state = len_or_flags
          else
            self.state += 1
            next
          end
        else
          len_or_flags << buf[pos]
        end

      when 0
        yield({
          :type => type,
          :txid => txid,
          :channel => channel,
          :flags => len_or_flags,
          :body => body
        })
        trim = pos + 1
        self.state = -7

      else
        self.state -= 1
        body << buf[pos]

    end

    self.pos += 1
  end

  if trim > 0
    self.pos -= trim
    self.buf = self.buf[trim..-1]
  end

rescue Fyrehose::ProtocolError => e
  raise Fyrehose::ProtocolError.new(self.buf, self.pos)
end