class Bundler::Source::Rubygems

def remote_specs
  @remote_specs ||= Index.build do |idx|
    index_fetchers = fetchers - api_fetchers
    # gather lists from non-api sites
    index_fetchers.each do |f|
      Bundler.ui.info "Fetching source index from #{f.uri}"
      idx.use f.specs_with_retry(nil, self)
    end
    # because ensuring we have all the gems we need involves downloading
    # the gemspecs of those gems, if the non-api sites contain more than
    # about 100 gems, we just treat all sites as non-api for speed.
    allow_api = idx.size < API_REQUEST_LIMIT && dependency_names.size < API_REQUEST_LIMIT
    Bundler.ui.debug "Need to query more than #{API_REQUEST_LIMIT} gems." \
      " Downloading full index instead..." unless allow_api
    if allow_api
      api_fetchers.each do |f|
        Bundler.ui.info "Fetching gem metadata from #{f.uri}", Bundler.ui.debug?
        idx.use f.specs_with_retry(dependency_names, self)
        Bundler.ui.info "" unless Bundler.ui.debug? # new line now that the dots are over
      end
      # Suppose the gem Foo depends on the gem Bar.  Foo exists in Source A.  Bar has some versions that exist in both
      # sources A and B.  At this point, the API request will have found all the versions of Bar in source A,
      # but will not have found any versions of Bar from source B, which is a problem if the requested version
      # of Foo specifically depends on a version of Bar that is only found in source B. This ensures that for
      # each spec we found, we add all possible versions from all sources to the index.
      loop do
        idxcount = idx.size
        api_fetchers.each do |f|
          Bundler.ui.info "Fetching version metadata from #{f.uri}", Bundler.ui.debug?
          idx.use f.specs_with_retry(idx.dependency_names, self), true
          Bundler.ui.info "" unless Bundler.ui.debug? # new line now that the dots are over
        end
        break if idxcount == idx.size
      end
      if api_fetchers.any?
        # it's possible that gems from one source depend on gems from some
        # other source, so now we download gemspecs and iterate over those
        # dependencies, looking for gems we don't have info on yet.
        unmet = idx.unmet_dependency_names
        # if there are any cross-site gems we missed, get them now
        api_fetchers.each do |f|
          Bundler.ui.info "Fetching dependency metadata from #{f.uri}", Bundler.ui.debug?
          idx.use f.specs_with_retry(unmet, self)
          Bundler.ui.info "" unless Bundler.ui.debug? # new line now that the dots are over
        end if unmet.any?
      else
        allow_api = false
      end
    end
    unless allow_api
      api_fetchers.each do |f|
        Bundler.ui.info "Fetching source index from #{f.uri}"
        idx.use f.specs_with_retry(nil, self)
      end
    end
  end
end