Class: Readis::Monitor

Inherits:
Readis
  • Object
show all
Defined in:
lib/readis/monitor.rb

Instance Method Summary collapse

Methods inherited from Readis

command_runner, #help

Constructor Details

#initialize(*args) ⇒ Monitor

Returns a new instance of Monitor.



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# File 'lib/readis/monitor.rb', line 4

def initialize(*args)
  super
  if options[:includes] && options[:excludes]
    raise ArgumentError, "Define either --includes or --excludes, but not both."
  end
end

Instance Method Details

#colorize(name, string) ⇒ Object 



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# File 'lib/readis/monitor.rb', line 197

def colorize(name, string)
  if @options[:colorized]
    [Term::ANSIColor.send(name), string, Term::ANSIColor.reset].join
  else
    string
  end
end

#filtered?(command) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/readis/monitor.rb', line 189

def filtered?(command)
  if list = @options[:includes]
    !list.include?(command)
  elsif list = @options[:excludes]
    list.include?(command)
  end
end

#format(line) ⇒ Object 



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# File 'lib/readis/monitor.rb', line 49

def format(line)
  if timestamp = line.slice!(/^[\d.]+ /)
    timestamp.strip!
  end
  if client = line.slice!(/\[\d+ [\d:\.]+\] "/)
    client = client.slice(3..-4)
  end
  parts = line.split('" "').map {|p| p.chomp('"') }

  command = parts[0].upcase
  return if filtered?(command)

  out = [ format_command(command) ]

  one_channel_one_message = %w(PUBLISH)
  one_key_one_value = %w(APPEND GETSET LPUSHX RPUSHX SET SETNX)
  one_key_one_argument = %w(DECRBY EXPIRE EXPIREAT GETBIT INCRBY LINDEX MOVE RENAME RENAMENX)
  one_key_one_field = %w(HEXISTS HGET)
  one_key_one_field_one_value = %w(HSET HSETNX)

  # TODO: add the rest of the redis commands
  case command
  when *one_channel_one_message
    # one channel, one message
    out << format_channel(parts[1])
    out << format_message(parts[2])
  when *one_key_one_value
    # one key, one value
    out << format_key(parts[1])
    out << format_value(parts[2])
  when *one_key_one_argument
    # one key, one arg
    out << format_key(parts[1])
    out << format_argument(parts[2])
  when "BLPOP"
    # variable number of keys, last part is an arg
    parts.slice(1..-2).each do |part|
      out << format_key(part)
    end
    out << format_argument(parts[-1])
  when "LPUSH", "RPUSH", "ZREM"
    # one key, rest are values
    out << format_key(parts[1])
    parts.slice(2..-1).each do |part|
      out << format_value(part)
    end
  when "ZRANGE", "ZRANGEBYSCORE", "ZREMRANGEBYSCORE",
    "ZREMRANGEBYRANK", "ZCOUNT", "ZREVRANK", "ZREVRANGE"
    # one key, rest are arguments
    out << format_key(parts[1])
    parts.slice(2..-1).each do |part|
      out << format_argument(part)
    end
  when "HMSET"
    # key, field, value, [field, value, ...]
    out << format_key(parts[1])
    out << "\n" + format_field(parts[2])
    out << format_value(parts[3])
    parts.slice(4..-1).each_slice(2) do |a|
      out << "\n" + format_field(a[0])
      out << format_value(a[1])
    end
  when *one_key_one_field_one_value
    # key, field, value
    out << format_key(parts[1])
    out << format_field(parts[2])
    out << format_value(parts[3])
  when *one_key_one_field
    # key, field
    out << format_key(parts[1])
    out << format_field(parts[2])
  when "ZADD", "ZINCRBY"
    # ZADD score member [score] [member]
    out << format_key(parts[1])
    parts.slice(2..-1).each_slice(2) do |pair|
      out << format_argument(pair.first)
      out << format_value(pair.last)
    end
  else
    # all keys
    if rest = parts.slice(1..-1)
      parts.slice(1..-1).each do |part|
        out << format_key(part)
      end
    end
  end
  "#{colorize(:underscore, timestamp)} #{out.join('')}"
end

#format_argument(string) ⇒ Object 



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# File 'lib/readis/monitor.rb', line 159

def format_argument(string)
  colorize(:magenta, string + " ")
end

#format_channel(string) ⇒ Object 



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# File 'lib/readis/monitor.rb', line 151

def format_channel(string)
  colorize(:cyan, string + " ")
end

#format_command(string) ⇒ Object

Wraps the command in the appropriate ANSI color codes



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# File 'lib/readis/monitor.rb', line 139

def format_command(string)
  case string
  when "MULTI", "EXEC", "WATCH"
    colorize(:red, string + " ")

  when /SUBSCRIBE/, "PUBLISH"
    colorize(:yellow, string + " ")
  else
    colorize(:green, string + " ")
  end
end

#format_field(string) ⇒ Object 



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# File 'lib/readis/monitor.rb', line 163

def format_field(string)
  colorize(:blue, string + " ")
end

#format_key(string) ⇒ Object 



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# File 'lib/readis/monitor.rb', line 155

def format_key(string)
  colorize(:cyan, string + " ")
end

#format_message(string) ⇒ Object 



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# File 'lib/readis/monitor.rb', line 167

def format_message(string)
  begin
    string.gsub!(/\\/, "")
    object = JSON.parse(string)
    out = "\n" + JSON.pretty_generate(object)
  rescue
    out = string + " "
  end
  out
end

#format_value(string) ⇒ Object 



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# File 'lib/readis/monitor.rb', line 178

def format_value(string)
  begin
    string.gsub!(/\\/, "")
    object = JSON.parse(string)
    out = "\n" + JSON.pretty_generate(object)
  rescue
    out = string + " "
  end
  out
end

#options ⇒ Object 



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# File 'lib/readis/monitor.rb', line 19

def options
  @options ||= super.merge(
    :colorized => false
  )
end

#parser ⇒ Object 



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# File 'lib/readis/monitor.rb', line 25

def parser
  optparser = super
  optparser.banner = <<-BANNER

Usage: readis monitor [options]

  BANNER
  optparser.on("-c", "--color", "enable syntax coloring") do |color|
    options[:colorized] = true
  end
  optparser.on("-i", "--include COMMANDS",
    "comma separated list of Redis commands to include") do |includes|
    options[:includes] = includes.split(",").map {|c| c.upcase}
  end
  optparser.on("-e", "--exclude COMMANDS",
    "comma separated list of Redis commands to exclude") do |excludes|
    options[:excludes] = excludes.split(",").map {|c| c.upcase}
  end
  # TODO: options for
  # * compact vs. spacey
  # * timestamp on/off
  optparser
end

#run ⇒ Object 



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# File 'lib/readis/monitor.rb', line 11

def run
  @redis.monitor do |line|
    if formatted = format(line)
      puts formatted
    end
  end
end