Class: CloudFormationTool::CloudFormation::Stack

Inherits:
Object
  • Object
show all
Includes:
CloudFormationTool, Storable, Enumerable
Defined in:
lib/cloud_formation_tool/cloud_formation/stack.rb

Constant Summary

Constants included from CloudFormationTool

VERSION

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from CloudFormationTool

#aws_config, #awsas, #awscf, #awscreds, #awsec2, #awss3, #cf_bucket_name, #find_profile, #profile, #region, #s3_bucket_name

Methods included from Storable

#make_filename, #upload

Constructor Details

#initialize(name) ⇒ Stack

Returns a new instance of Stack.



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# File 'lib/cloud_formation_tool/cloud_formation/stack.rb', line 11

def initialize(name)
  @name = name
  @seenev = Set.new
  @watch_timeouts = 0
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/cloud_formation_tool/cloud_formation/stack.rb', line 9

def name
  @name
end

Instance Method Details

#asgroups ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/stack.rb', line 77

def asgroups
  resources.select do |res|
    res.resource_type == 'AWS::AutoScaling::AutoScalingGroup'
  end
end

#create(template, params = {}) ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/stack.rb', line 47

def create(template, params = {})
  tmpl = CloudFormation.parse(template).to_yaml(params)
  url = upload(make_filename('yaml'), tmpl)
  return update(url, template, params) if exist?
  log "Creating stack '#{name}' from '#{template}' params #{params.inspect}"
  resp = awscf.create_stack({
    stack_name: @name,
    template_url: url,
    capabilities: %w(CAPABILITY_IAM CAPABILITY_NAMED_IAM),
    on_failure: "DO_NOTHING", ##"ROLLBACK",
    parameters: params.collect do |k,v|
      {
        parameter_key: k.to_s,
        parameter_value: v.to_s,
        use_previous_value: false,
      }
    end
  })
  resp.stack_id
end

#delete ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/stack.rb', line 17

def delete
  awscf.delete_stack  stack_name: @name
end

#each ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/stack.rb', line 114

def each
  token = nil
  sleep(if @_last_poll_time.nil?
    0
    else
      diff = Time.now - @_last_poll_time
      if diff < 1
        diff
      else
        0
      end
    end)
  begin
    resp = awscf.describe_stack_events stack_name: name, next_token: token
    @watch_timeouts = 0
    resp.stack_events.each do |ev|
      yield ev
    end
  rescue Aws::CloudFormation::Errors::Throttling => e
    sleep 1
    retry
  rescue Seahorse::Client::NetworkingError => e # we get this when there's a timeout
    if (@watch_timeouts += 1) > 5
      raise CloudFormationTool::Errors::AppError, "Too many timeouts!"
    else
      retry
    end
  rescue Aws::CloudFormation::Errors::ValidationError => e
    if e.message =~ /does not exist/
      raise CloudFormationTool::Errors::StackDoesNotExistError, "Stack does not exist"
    else
      raise e
    end
  end
end

#exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cloud_formation_tool/cloud_formation/stack.rb', line 21

def exist?
  begin
    awscf.describe_stacks stack_name: name
    true
  rescue Aws::CloudFormation::Errors::ValidationError => e
    false
  end
end

#monitor(start_time = nil) ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/stack.rb', line 87

def monitor(start_time = nil)
  done = false
  begin
    until done
      reverse_each do |ev|
        next if @seenev.add?(ev.event_id).nil?
        text = "#{ev.timestamp.strftime "%Y-%m-%d %H:%M:%S"}| " + %w(
          resource_type:40
          logical_resource_id:38
          resource_status
        ).collect { |field|
          (name,size) = field.split(":")
          size ||= 1
          ev.send(name.to_sym).ljust(size.to_i, ' ')
        }.join("  ")
        text += " " + ev.resource_status_reason if ev.resource_status =~ /_FAILED/
        if start_time.nil? or start_time < ev.timestamp
          puts text
        end
        done = (ev.resource_type == "AWS::CloudFormation::Stack" and ev.resource_status =~ /(_COMPLETE|_FAILED)$/)
      end
    end
  rescue CloudFormationTool::Errors::StackDoesNotExistError => e
    puts "Stack #{name} does not exist"
  end
end

#resources ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/stack.rb', line 68

def resources
  begin
    resp = awscf.describe_stack_resources  stack_name: @name
    resp.stack_resources
  rescue Aws::CloudFormation::Errors::ValidationError => e
    raise CloudFormationTool::Errors::AppError, "Failed to get resources: #{e.message}"
  end
end

#see_events ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/stack.rb', line 83

def see_events
  each { |e| @seenev << e.event_id }
end

#update(url, filepath, params = {}) ⇒ Object 



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# File 'lib/cloud_formation_tool/cloud_formation/stack.rb', line 30

def update(url, filepath, params = {})
  log "Updating existing stack '#{name}' from '#{filepath}' params #{params.inspect}"
  resp = awscf.update_stack({
    stack_name: @name,
    template_url: url,
    capabilities: %w(CAPABILITY_IAM CAPABILITY_NAMED_IAM),
    parameters: params.collect do |k,v|
      {
        parameter_key: k.to_s,
        parameter_value: v.to_s,
        use_previous_value: false,
      }
    end
  })
  resp.stack_id
end