gistfile1.txt

require 'rubygems'
require 'net/http'
require 'sinatra'
require 'json'

def get_url(file)
  response = nil

  Net::HTTP.start('rubygems.org', 80) do |http|
    response = http.head("/gems/#{file}")
  end

  response['location']
end

urls = {}
counts = Hash.new(0)

get '/gems/:file' do
  file = params[:file]

  if u = urls[file]
    counts[file] += 1
  else
    u = get_url(file)
    urls[file] = u
    count = 0
  end

  redirect u
end

get '/stats' do
  counts.to_json
end

get '/refresh_stats' do
  c = counts
  counts = Hash.new(0)
  c.to_json
end

get '/*' do
  redirect "http://rubygems.org/#{params[:splat].first}"
end

Hey Evan,

Something I put together a while ago, the Fuse dependency is probably too heavy for many uses, but as a combined concept, could be somewhat interesting to build progressive mirrors:

https://gist.github.com/1113280

Enjoy!