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require 'rack'
require 'rack/handler/webrick'
require 'net/http'
# The code for this is inspired by Capybara's server:
# http://github.com/jnicklas/capybara/blob/0.3.9/lib/capybara/server.rb
module VCR
class LocalhostServer
READY_MESSAGE = "VCR server ready"
class Identify
def initialize(app)
@app = app
end
def call(env)
if env["PATH_INFO"] == "/__identify__"
[200, {}, [VCR::LocalhostServer::READY_MESSAGE]]
else
@app.call(env)
end
end
end
attr_reader :port
def initialize(rack_app, port = nil)
@port = port || find_available_port
@rack_app = rack_app
concurrently { boot }
wait_until(30, "Boot failed.") { booted? }
end
private
def find_available_port
server = TCPServer.new('127.0.0.1', 0)
server.addr[1]
ensure
server.close if server
end
def boot
# Use WEBrick since it's part of the ruby standard library and is available on all ruby interpreters.
options = { :Port => port, :ShutdownSocketWithoutClose => true }
options.merge!(:AccessLog => [], :Logger => WEBrick::BasicLog.new(StringIO.new)) unless ENV['VERBOSE_SERVER']
Rack::Handler::WEBrick.run(Identify.new(@rack_app), **options)
end
def booted?
res = ::Net::HTTP.get_response("localhost", '/__identify__', port)
if res.is_a?(::Net::HTTPSuccess) or res.is_a?(::Net::HTTPRedirection)
return res.body == READY_MESSAGE
end
rescue Errno::ECONNREFUSED, Errno::EBADF
return false
end
def concurrently
# JRuby doesn't support forking.
# Rubinius does, but there's a weird issue with the booted? check not working,
# so we're just using a thread for now.
Thread.new { yield }
end
def wait_until(timeout, error_message, &block)
start_time = Time.now
while true
return if yield
raise TimeoutError.new(error_message) if (Time.now - start_time) > timeout
sleep(0.01)
end
end
end
end
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