Class: Inspec::CachedFetcher

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/inspec/cached_fetcher.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(target, cache) ⇒ CachedFetcher

Returns a new instance of CachedFetcher.



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# File 'lib/inspec/cached_fetcher.rb', line 10

def initialize(target, cache)
  @target = target
  @fetcher = Inspec::Fetcher.resolve(target)

  if @fetcher.nil?
    raise("Could not fetch inspec profile in #{target.inspect}.")
  end

  @cache = cache
end

Instance Attribute Details

#cache ⇒ Object (readonly)

Returns the value of attribute cache.



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# File 'lib/inspec/cached_fetcher.rb', line 9

def cache
  @cache
end

#fetcher ⇒ Object (readonly)

Returns the value of attribute fetcher.



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# File 'lib/inspec/cached_fetcher.rb', line 9

def fetcher
  @fetcher
end

#target ⇒ Object (readonly)

Returns the value of attribute target.



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# File 'lib/inspec/cached_fetcher.rb', line 9

def target
  @target
end

Instance Method Details

#assert_cache_sanity! ⇒ Object 



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# File 'lib/inspec/cached_fetcher.rb', line 50

def assert_cache_sanity!
  return unless target.respond_to?(:key?) && target.key?(:sha256)

  exception_message = <<~EOF
    The remote source #{fetcher} no longer has the requested content:

    Request Content Hash: #{target[:sha256]}
    Actual Content Hash: #{fetcher.resolved_source[:sha256]}

    For URL, supermarket, compliance, and other sources that do not
    provide versioned artifacts, this likely means that the remote source
    has changed since your lockfile was generated.
  EOF
  raise exception_message if fetcher.resolved_source[:sha256] != target[:sha256]
end

#cache_key ⇒ Object 



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# File 'lib/inspec/cached_fetcher.rb', line 26

def cache_key
  k = if target.is_a?(Hash)
        target[:sha256] || target[:ref]
      end

  if k.nil?
    fetcher.cache_key
  else
    k
  end
end

#fetch ⇒ Object 



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# File 'lib/inspec/cached_fetcher.rb', line 38

def fetch
  if cache.exists?(cache_key)
    Inspec::Log.debug "Using cached dependency for #{target}"
    [cache.prefered_entry_for(cache_key), false]
  else
    Inspec::Log.debug "Dependency does not exist in the cache #{target}"
    fetcher.fetch(cache.base_path_for(fetcher.cache_key))
    assert_cache_sanity!
    [fetcher.archive_path, fetcher.writable?]
  end
end

#resolved_source ⇒ Object 



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# File 'lib/inspec/cached_fetcher.rb', line 21

def resolved_source
  fetch
  @fetcher.resolved_source
end