Class: Stackup::StackWatcher

Inherits:
Object
  • Object
show all
Defined in:
lib/stackup/stack_watcher.rb

Overview

A stack event observer.

Keeps track of previously processed events, and yields the new ones.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(stack) ⇒ StackWatcher

Returns a new instance of StackWatcher.



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# File 'lib/stackup/stack_watcher.rb', line 11

def initialize(stack)
  @stack = stack
  @processed_event_ids = Set.new
end

Instance Attribute Details

#stack ⇒ Object

Returns the value of attribute stack.



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# File 'lib/stackup/stack_watcher.rb', line 16

def stack
  @stack
end

Instance Method Details

#each_new_event ⇒ Object

Yield all events since the last call



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# File 'lib/stackup/stack_watcher.rb', line 20

def each_new_event
  # rubocop:disable Lint/HandleExceptions
  buffer = []
  stack.events.each do |event|
    break if @processed_event_ids.include?(event.event_id)
    buffer.unshift(event)
  end
  buffer.each do |event|
    yield event if block_given?
    @processed_event_ids.add(event.event_id)
  end
rescue Aws::CloudFormation::Errors::ValidationError
end

#zero ⇒ Object

Consume all new events



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# File 'lib/stackup/stack_watcher.rb', line 36

def zero
  each_new_event
  nil
end