Class: ConfigOMat::Op::DetermineRunningInstance

Inherits:
LifecycleVM::OpBase
  • Object
show all
Defined in:
lib/config_o_mat/flip_flopper/op/determine_running_instance.rb

Constant Summary collapse

RUNNING_STATES = 
%w[active activating reloading].freeze

Instance Method Summary collapse

Instance Method Details

#call ⇒ Object 



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# File 'lib/config_o_mat/flip_flopper/op/determine_running_instance.rb', line 27

def call
  i1_name = "#{service}1"
  i1_status = systemd_interface.service_status(i1_name)
  logger&.info(:service_status, name: i1_name, status: i1_status)

  i2_name = "#{service}2"
  i2_status = systemd_interface.service_status(i2_name)
  logger&.info(:service_status, name: i2_name, status: i2_status)

  i1_running = RUNNING_STATES.include?(i1_status)
  i2_running = RUNNING_STATES.include?(i2_status)

  if i1_running && i2_running
    error :service, 'both instances are currently running!'
  elsif i1_running
    self.activating_instance = 2
    self.running_instance = 1
  elsif i2_running
    self.activating_instance = 1
    self.running_instance = 2
  else
    # If neither version is up, attempt to bring up instance 1. Our attempt to stop
    # instance 2 will be a noop.
    self.activating_instance = 1
    self.running_instance = 2
  end
end