Class: Metrix::CLI

Inherits:
Object
  • Object
show all
Defined in:
lib/metrix/cli.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ CLI

Returns a new instance of CLI.



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# File 'lib/metrix/cli.rb', line 21

def initialize(args)
  @args = args
  @system = false
  @interval = 10
  require "syslog/logger"
  Metrix.logger = Syslog::Logger.new("metrix")
  Metrix.logger.level = Logger::INFO
end

Instance Attribute Details

#interval ⇒ Object (readonly)

Returns the value of attribute interval.



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# File 'lib/metrix/cli.rb', line 19

def interval
  @interval
end

Instance Method Details

#action ⇒ Object 



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# File 'lib/metrix/cli.rb', line 34

def action
  @action ||= parse!
end

#allowed_to_run? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/metrix/cli.rb', line 163

def allowed_to_run?
  !running?
end

#attributes ⇒ Object 



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# File 'lib/metrix/cli.rb', line 224

def attributes
  @attributes ||= {}
end

#config_path ⇒ Object 



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# File 'lib/metrix/cli.rb', line 238

def config_path
  @config_path || default_config_path
end

#daemonize? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/metrix/cli.rb', line 220

def daemonize?
  @foreground != true
end

#default_config_path ⇒ Object 



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# File 'lib/metrix/cli.rb', line 242

def default_config_path
  File.expand_path("/etc/metrix.yml")
end

#delete_pidfile! ⇒ Object 



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# File 'lib/metrix/cli.rb', line 83

def delete_pidfile!
  logger.info "deleteing pidfile #{pid_path}"
  FileUtils.rm_f(pid_path)
end

#elasticsearch_status ⇒ Object 



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# File 'lib/metrix/cli.rb', line 179

def elasticsearch_status
  get_url url_for(:elasticsearch)
end

#enabled?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/metrix/cli.rb', line 175

def enabled?(key)
  !!attributes[key]
end

#fetch_metrix(type) ⇒ Object 



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# File 'lib/metrix/cli.rb', line 201

def fetch_metrix(type)
  return false if !enabled?(type)
  started = Time.now
  logger.info "fetching metrix for #{type}"
  yield
  logger.info "fetched metrix for type #{type} in %.06f" % [Time.now - started]
rescue => err
  logger.error "#{err.message} #{err.backtrace.inspect}"
end

#fetch_resource(key) ⇒ Object 



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# File 'lib/metrix/cli.rb', line 183

def fetch_resource(key)
  get_url(url_for(key))
end

#get_url(url) ⇒ Object 



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# File 'lib/metrix/cli.rb', line 191

def get_url(url)
  Timeout.timeout(1) do
    logger.info "fetching URL #{url}"
    started = Time.now
    body = Net::HTTP.get(URI(url))
    logger.info "fetched URL #{url} in %.06f" % [Time.now - started]
    body
  end
end

#load_configs_from_file! ⇒ Object 



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# File 'lib/metrix/cli.rb', line 228

def load_configs_from_file!
  require "erb"
  require "yaml"
  hash = YAML.load(ERB.new(File.read(config_path)).result)
  @attributes = hash.inject({}) do |hash, (k, v)|
    hash[k.to_sym] = v
    hash
  end
end

#log_to_stdout ⇒ Object 



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# File 'lib/metrix/cli.rb', line 215

def log_to_stdout
  Metrix.logger = Logger.new(STDOUT)
  Metrix.logger.level = Logger::INFO
end

#logger ⇒ Object 



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# File 'lib/metrix/cli.rb', line 211

def logger
  Metrix.logger
end

#opts ⇒ Object 



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# File 'lib/metrix/cli.rb', line 246

def opts
  require "optparse"
  @opts ||= OptionParser.new do |o|
    o.on("-v", "--version") do
      puts "metrix #{Metrix::VERSION}"
      exit
    end

    o.on("-c PATH") do |value|
      @config_path = value
    end

    o.on("-d", "--debug") do |value|
      @foreground = true
      log_to_stdout
      Metrix.logger.level = Logger::DEBUG
    end
  end
end

#parse! ⇒ Object 



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# File 'lib/metrix/cli.rb', line 30

def parse!
  @action = opts.parse(@args).first
end

#pid_path ⇒ Object 



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# File 'lib/metrix/cli.rb', line 167

def pid_path
  "/var/run/metrix.pid"
end

#reporter ⇒ Object 



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# File 'lib/metrix/cli.rb', line 143

def reporter
  @reporter ||= if attributes[:opentsdb]
    require "metrix/opentsdb"
    uri = URI.parse(attributes[:opentsdb])
    Metrix::OpenTSDB.new(uri.host, uri.port)
  elsif attributes[:graphite]
    require "metrix/graphite"
    uri = URI.parse(attributes[:graphite])
    Metrix::Graphite.new(uri.host, uri.port)
  elsif @foreground == true
    require "metrix/reporter/stdout"
    Metrix::Reporter::Stdout.new
  end
end

#run ⇒ Object 



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# File 'lib/metrix/cli.rb', line 38

def run
  parse!
  case @action
  when "start"
    load_configs_from_file!
    if running?
      logger.warn "refuse to run. seems that #{pid_path} exists!"
      abort "not allowed to run" if running?
    end
    if daemonize?
      pid = Process.fork do
        start
      end
      sleep 1
      Process.detach(pid)
    else
      start
    end
  when "status"
    if File.exists?(pid_path)
      logger.debug "#{pid_path} exists"
      puts "STATUS: running with pid #{File.read(pid_path).strip}"
      exit 0
    else
      logger.debug "#{pid_path} does not exist"
      puts "STATUS: not running"
      exit 1
    end
  when "stop"
    abort "not running!" if !running?
    pid = File.read(pid_path).strip
    logger.info "killing pid #{pid}"
    system "kill #{pid}"
    puts "killed #{pid}"
  when "configtest"
    load_configs_from_file!
    puts "running configtest #{attributes.inspect}"
  when "list_metrics"
    puts Metrix.known_metrics.join("\n")
  else
    logger.warn "action #{action} unknown!"
    abort "action #{action} unknown!"
  end
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/metrix/cli.rb', line 171

def running?
  File.exists?(pid_path)
end

#start ⇒ Object 



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# File 'lib/metrix/cli.rb', line 88

def start
  if self.reporter.nil?
    puts "ERROR: at least one reporter must be specified"
    abort opts.to_s
  end
  Signal.trap("TERM") do
    logger.info "terminating..."
    $running = false
  end
  $running = true
  cnt = -1
  started = Time.now
  write_pidfile!(Process.pid)
  while $running
    begin
      cnt += 1
      now = Time.now.utc
      fetch_metrix(:elasticsearch)  { reporter << Metrix::ElasticSearch.new(fetch_resource(:elasticsearch)) }
      fetch_metrix(:mongodb)        { reporter << Metrix::Mongodb.new(fetch_resource(:mongodb)) }
      fetch_metrix(:nginx)          { reporter << Metrix::Nginx.new(fetch_resource(:nginx)) }
      fetch_metrix(:fpm)            { reporter << Metrix::FPM.new(fetch_resource(:fpm)) }
      fetch_metrix(:system)         { reporter << Metrix::System.new(File.read("/proc/stat")) }
      fetch_metrix(:load)           { reporter << Metrix::Load.new(File.read("/proc/loadavg")) }
      fetch_metrix(:memory)         { reporter << Metrix::Memory.new(File.read("/proc/meminfo")) }
      fetch_metrix(:diskstats)      { reporter << Metrix::Diskstats.new(File.read("/proc/diskstats")) }
      fetch_metrix(:df)             { reporter << Metrix::Df.new(`df -k`) }

      fetch_metrix :processes do
        Metrix::ProcessMetric.all.each do |m|
          reporter << m
        end
      end
      reporter.flush
    rescue SystemExit
      $running = false
    rescue => err
      Metrix.logger.error "#{err.message}"
      Metrix.logger.error "#{err.backtrace.inspect}"
    ensure
      begin
        sleep_for = @interval - (Time.now - started - cnt * interval)
        if sleep_for > 0
          Metrix.logger.info "finished run in %.06f, sleeping for %.06f. metrix version: #{Metrix::VERSION}, attributes: #{attributes}" % [Time.now - now, sleep_for]
          sleep sleep_for
        else
          Metrix.logger.info "not sleeping because %.06f is negative" % [sleep_for]
        end
      rescue SystemExit, Interrupt
        $running = false
      end
    end
  end
  delete_pidfile!
end

#url_for(key) ⇒ Object 



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# File 'lib/metrix/cli.rb', line 187

def url_for(key)
  attributes[key]
end

#write_pidfile!(pid) ⇒ Object 



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# File 'lib/metrix/cli.rb', line 158

def write_pidfile!(pid)
  logger.info "writing #{pid} to #{pid_path}"
  File.open(pid_path, "w") { |f| f.print(pid) }
end