nodetool cfstatsをJSONに変換

cfstats2json.rb

#!/usr/local/bin/ruby
require 'json'

result = {}
cur_ks = nil
cur_cf = nil

ARGF.each_line do |line|
  line.strip!
  if line =~ /^Keyspace: (.+)/
    cur_ks = $1
    result[cur_ks] ||= {}
  elsif line =~ /^Column Family: (.+)/
    cur_cf = $1
    result[cur_ks]['cf'] ||= {}
    result[cur_ks]['cf'][cur_cf] ||= {}
  elsif line =~ /^(Read Count|Read Latency|Write Count|Write Latency|Pending Tasks): (.+)/
    if result[cur_ks][$1]
      result[cur_ks]['cf'][cur_cf][$1] = $2
    else
      result[cur_ks][$1] = $2
    end
  elsif line =~ /^(.+): (.+)$/
    result[cur_ks]['cf'][cur_cf][$1] = $2
  end
end
puts JSON.pretty_generate(result)