Class: RedisHA::Protocol

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

Class Method Summary collapse

Class Method Details

.parse(buf) ⇒ Object 



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# File 'lib/redis_ha/protocol.rb', line 39

def self.parse(buf)
  case buf[0]
    when "-", "+", ":" then
      len = buf.index("\r\n")
      ret = buf[0..len-1]
      buf.replace(buf[len+2..-1])

      case ret[0]
        when "+" then ret[1..-1]
        when ":" then ret[1..-1].to_i
        when "-" then RuntimeError.new(ret[1..-1])
      end

    when "$"
      if buf[1..2] == "-1"
        buf.replace(buf[5..-1] || "")
        nil
      else
        len = buf.match(/^\$([-0-9]+)\r\n/)[1]
        ret = buf[len.length+3..len.length+len.to_i+2]
        buf.replace(buf[len.to_i+len.length+5..-1] || "")
        ret
      end

    when "*"
      cnt = buf.match(/^\*([0-9]+)\r\n/)[1]
      buf = buf[cnt.length+3..-1]
      cnt.to_i.times.map { parse(buf) }

  end
end

.peek?(buf) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/redis_ha/protocol.rb', line 9

def self.peek?(buf)
  if ["+", ":", "-"].include?(buf[0])
    !!buf.index("\r\n")

  elsif ["$", "*"].include?(buf[0])
    offset = buf.index("\r\n").to_i
    return false if offset == 0
    length = buf[1..offset].to_i
    return true if length == -1
    offset += 2

    if buf[0] == "*"
      multi = length
      length.times do |ind|
        if buf[offset+1..offset+2] == "-1"
          offset += 5
        elsif /^\$(?<len>[0-9]+)\r\n/ =~ buf[offset..-1]
          length = len.to_i
          offset += len.length + 3
          offset += length + 2 if ind < multi - 1
        else
          return false
        end
      end
    end

    buf.size >= (length + offset + 2)
  end
end

.request(*args) ⇒ Object 



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# File 'lib/redis_ha/protocol.rb', line 3

def self.request(*args)
  args.inject("*#{args.size}\r\n") do |s, arg|
    s << "$#{arg.to_s.length}\r\n#{arg}\r\n"
  end
end