Class: CfnEvents::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/cfn-events/runner.rb

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/cfn-events/runner.rb', line 5

def initialize(config)
  @config = config

  @config.cfn_client ||= begin
                           effective_options = CfnEvents::Client.core_v2_options.merge(config.client_options)
                           Aws::CloudFormation::Client.new(effective_options)
                         end
end

Instance Method Details

#all_events ⇒ Object 



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# File 'lib/cfn-events/runner.rb', line 26

def all_events
  @config.cfn_client.describe_stack_events(stack_name: @stack_id).data.stack_events.reverse
end

#core_v2_options ⇒ Object 



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# File 'lib/cfn-events/runner.rb', line 14

def core_v2_options
  i
end

#events_since_id(id) ⇒ Object 



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# File 'lib/cfn-events/runner.rb', line 35

def events_since_id(id)
  # There may be a more efficient algorithm
  events = all_events
  i = events.index {|e| e.event_id == id }
  if i < 0
    events
  else
    events[i+1..-1]
  end
end

#events_since_time(events, t) ⇒ Object 



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# File 'lib/cfn-events/runner.rb', line 30

def events_since_time(events, t)
  # There may be a more efficient algorithm
  events.select {|e| e.timestamp > t }
end

#resolve_stack(stack_name_or_id) ⇒ Object 



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# File 'lib/cfn-events/runner.rb', line 18

def resolve_stack(stack_name_or_id)
  ans = @config.cfn_client.describe_stacks(stack_name: stack_name_or_id).data.stacks[0].stack_id
  if ans != stack_name_or_id
    $stderr.puts "Resolved #{stack_name_or_id} to #{ans}"
  end
  ans
end

#run ⇒ Object

Calls $stdout.sync. Returns 0/1/2, like the command line exit code.



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# File 'lib/cfn-events/runner.rb', line 68

def run
  @stack_id = resolve_stack(@config.stack_name_or_id)

  events = all_events

  if @config.since
    show_events(events_since_time(events, @config.since))
  else
    show_events(events)
  end

  return 0 unless @config.forever or @config.wait

  while @config.forever or not steady_state?(events.last)
    $stdout.sync
    sleep @config.poll_seconds

    new_events = events_since_id(events.last.event_id)

    unless new_events.empty?
      show_events(new_events)
      events = new_events
    end
  end

  return 2 if events.last.resource_status.match /FAILED/
  return 1 if events.last.resource_status.match /ROLLBACK/
  return 0
end

#show_events(events) ⇒ Object 



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# File 'lib/cfn-events/runner.rb', line 46

def show_events(events)
  events.each do |e|
    if @config.output_json
      puts JSON.generate(e.to_h)
    else
      puts [
        e.timestamp.utc.strftime('%Y-%m-%dT%H:%M:%SZ'),
        e.resource_type,
        e.resource_status,
        e.logical_resource_id,
        e.physical_resource_id,
        e.resource_status_reason,
      ].join " "
    end
  end
end

#steady_state?(e) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cfn-events/runner.rb', line 63

def steady_state?(e)
  e.resource_type == "AWS::CloudFormation::Stack" and not e.resource_status.match(/IN_PROGRESS/)
end