aws / aws-sdk-ruby / 1117

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Add a custom block waiter to all resources.

This is a proof-of-concept attempt to provide the following functionality:

    # polls until the block returns a truthy value, or until the
    # max number of attempts
    resource.wait_until do |resource|
      resource.status == 'destired-state'
    end

A more concrete example:

    # waiting for an object in Amazon S3 to change

    s3 = Aws::S3::Resource.new
    obj = s3.bucket('aws-sdk').object('key')
    old_etag = obj.etag

    obj.wait_until { |obj| obj.etag != old_etag }

Like the other waiters you can throw `:success`, or `:failure` from
the block to stop waiting. Supports configuration options such as:

* :max_attempts - defauts to 10 for all resources
* :delay - defauts to 10 for all resources
* :before_request - optional callback to emit before request
* :before_wait - optional callback to emit before waiting between requests

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