Class: EtcdTools::VipWatchdog

Inherits:
Watchdog::Init show all
Includes:
Watchdog::Vip
Defined in:
lib/etcd-tools/etcd_watchdog_vip.rb

Instance Method Summary collapse

Methods included from Watchdog::Vip

#got_vip?, #vip_alive?, #vip_dup?, #vip_handle!, #vip_update_arp!

Methods inherited from Watchdog::Init

#initialize

Methods included from Watchdog::Threads

#thread_etcd, #thread_icmp

Methods included from Watchdog::Etcd

#etcd_connect!, #leader?

Methods included from Watchdog::Helpers

#arp, #arping, #hostname, #iproute

Methods included from Watchdog::Logger

#debug, #err, #info

Constructor Details

This class inherits a constructor from EtcdTools::Watchdog::Init

Instance Method Details

#run ⇒ Object 



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# File 'lib/etcd-tools/etcd_watchdog_vip.rb', line 13

def run
  if Process.euid != 0
    err 'Must run under root user!'
    exit! 1
  end
  @semaphore.merge!({ icmp: Mutex.new })
  @thread = { icmp: thread_icmp, etcd: thread_etcd }
  @status_etcd = false
  @status_icmp = false
  @thread.each_value(&:run)
  sleep @config[:parameters][:interval]
  first_cycle = true
  while !@exit do
    status_etcd = status_icmp = false # FIXME: introduce CVs...
    @semaphore[:icmp].synchronize { status_icmp = @status_icmp }
    @semaphore[:etcd].synchronize { status_etcd = @status_etcd }
    if status_etcd
      if got_vip?
        debug '<main> i am the leader with VIP, that is OK'
      else
        info '<main> i am the leader without VIP, checking whether it is free'
        if status_icmp
          info '<main> VIP is still up! (ICMP)'
          # FIXME: notify by sensu client socket
        else
          info '<main> VIP is unreachable by ICMP, checking for duplicates on L2'
          if vip_dup?
            info '<main> VIP is still assigned! (ARP)'
            # FIXME: notify by sensu client socket
          else
            info '<main> VIP is free, assigning'
            vip_handle! status_etcd
            info '<main> updating other hosts about change'
            vip_update_arp!
          end
        end
      end
    else
      if got_vip?
        info '<main> i got VIP and should not, removing'
        vip_handle! status_etcd
        info '<main> updating other hosts about change'
        vip_update_arp!
      else
        debug '<main> i am not a leader and i do not have the VIP, that is OK'
      end
    end
    sleep @config[:parameters][:interval]
    if first_cycle
      @semaphore[:icmp].synchronize { status_icmp = @status_icmp }
      @semaphore[:etcd].synchronize { status_etcd = @status_etcd }
      info "<main> i #{status_etcd ? 'AM' : 'am NOT'} the leader"
      info "<main> i #{got_vip? ? 'DO' : 'do NOT'} have the VIP"
      info "<main> i #{status_icmp ? 'CAN' : 'CANNOT'} see the VIP"
    end
    first_cycle = false
  end
  info '<main> terminated!'
  if got_vip?
    info '<main> removing VIP'
    vip_handle! false
    vip_update_arp!
  end
  info '<main> stopping threads...'
  @thread.each_value(&:join)
  info '<main> exiting...'
  exit 0
end