Class: CloudwatchScheduler::Provisioner

Inherits:
Object
  • Object
show all
Defined in:
lib/cloudwatch_scheduler/provisioner.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config, sqs_client: Aws::SQS::Client.new, cwe_client: Aws::CloudWatchEvents::Client.new) ⇒ Provisioner

Returns a new instance of Provisioner.



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# File 'lib/cloudwatch_scheduler/provisioner.rb', line 10

def initialize(config, sqs_client: Aws::SQS::Client.new,
               cwe_client: Aws::CloudWatchEvents::Client.new)
  @config = config
  @sqs_client = sqs_client
  @cwe_client = cwe_client
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/cloudwatch_scheduler/provisioner.rb', line 8

def config
  @config
end

Instance Method Details

#create_events! ⇒ Object 



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# File 'lib/cloudwatch_scheduler/provisioner.rb', line 29

def create_events!
  rule_arns = config.tasks.map do |_name, task|
    rule_arn = cwe.put_rule(
      name:                task.rule_name,
      schedule_expression: task.rule_schedule_expression,
      state:               "ENABLED",
      description:         "CloudwatchScheduler task defined at #{task.code.source_location}"
    ).rule_arn

    cwe.put_targets(
      rule:    task.rule_name,
      targets: [
        {
          id:    task.rule_name,
          arn:   queue_arn,
          input: task.event_data.to_json
        }
      ]
    )

    rule_arn
  end

  policy = {
    Version:   "2012-10-17",
    Id:        "#{queue_arn}/SQSDefaultPolicy",
    Statement: rule_arns.map do |rule_arn|
      {
        Sid:       "TrustCWESendingToSQS",
        Effect:    "Allow",
        Principal: {
          AWS: "*"
        },
        Action:    "sqs:SendMessage",
        Resource:  queue_arn,
        Condition: {
          ArnEquals: {
            "aws:SourceArn": rule_arn
          }
        }
      }
    end
  }

  sqs.set_queue_attributes(
    queue_url:  queue_url,
    attributes: {
      "Policy" => policy.to_json
    }
  )
end

#create_queue! ⇒ Object 



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# File 'lib/cloudwatch_scheduler/provisioner.rb', line 22

def create_queue!
  attributes = { "VisibilityTimeout" => config.queue_visibility_timeout.to_s }
  @queue_url = sqs.create_queue(queue_name: queue_name, attributes: attributes).queue_url

  create_dead_letter_queue! if config.use_dead_letter_queue
end

#provision ⇒ Object 



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# File 'lib/cloudwatch_scheduler/provisioner.rb', line 17

def provision
  create_queue!
  create_events!
end