em-heroku.rb

# monkey patch heroku to replace rest-client with em-http-request
class Heroku::Client
  def process(method, uri, extra_headers={}, payload=nil)
    headers  = heroku_headers.merge(extra_headers)
    args     = [method, payload, headers].compact
    # begin HACK
    # response = resource(uri).send(*args)
    basic_auth = {'Authorization' => 'Basic ' +
      ["#{user}:#{password}"].pack('m').delete("\r\n")}

    if uri =~ /^https?/
      http = EM::HttpRequest.new(uri)
    else
      http = EM::HttpRequest.new("https://api.#{host}#{uri}")
    end

    response = http.send(method,
                 :head => {'Accept' => '*/*; q=0.5, application/xml',
                           'Accept-Encoding' => 'gzip, deflate'}.
                           merge(headers.merge(basic_auth)),
                 :body => payload)

    if status = response && response.response_header.status
      unless response.error.strip.empty? && status == 200
        klass = RestClient::Exceptions::EXCEPTIONS_MAP[status]
        if klass
          raise klass.new
        else
          raise RestClient::Exception
        end
      end
    end

    class << response
      alias_method :headers, :response_header
      alias_method :to_s, :response
    end
    # end HACK

    extract_warning(response)
    response
  end
end

Thanks for this!

Took me a few reads through to realise this was for em-synchrony rather than plain eventmachine.

Ohhh, I'm sorry about that. I should mention this in the gist. Here's my first blog post about this patch, if you want to know some motivation behind this: http://blogger.godfat.org/2010/09/asynchronized-heroku-scaler-in-ruby-19.html A not very related sequel: http://blogger.godfat.org/2011/03/asynchronized-heroku-scaler-in-ruby-19.html

Thanks for those, good reading. Nice to know it wasn't me doing something wrong with needing to wrap calling code in a Fiber to avoid "can't yield from root fiber" errors.