new_contents: 
  """
  Benchmark a server's handling of event deletion.
  """
  
  from itertools import count
  from urllib2 import HTTPDigestAuthHandler
  
  from twisted.internet import reactor
  from twisted.internet.defer import inlineCallbacks, returnValue
  from twisted.web.client import Agent
  from twisted.web.http_headers import Headers
  
  from httpauth import AuthHandlerAgent
  from httpclient import StringProducer
  
  from benchlib import initialize, sample
  from event import makeEvent
  
  @inlineCallbacks
  def measure(host, port, dtrace, attendeeCount, samples):
      user = password = "user01"
      root = "/"
      principal = "/"
      calendar = "event-deletion-benchmark"
  
      authinfo = HTTPDigestAuthHandler()
      authinfo.add_password(
          realm="Test Realm",
          uri="http://%s:%d/" % (host, port),
          user=user,
          passwd=password)
      agent = AuthHandlerAgent(Agent(reactor), authinfo)
  
      # Set up the calendar first
      yield initialize(agent, host, port, user, password, root, principal, calendar)
  
      # An infinite stream of VEVENTs to PUT to the server.
      events = ((i, makeEvent(i, attendeeCount)) for i in count(2))
  
      # Create enough events to delete
      uri = 'http://%s:%d/calendars/__uids__/%s/%s/foo-%%d.ics' % (
          host, port, user, calendar)
      headers = Headers({"content-type": ["text/calendar"]})
      urls = []
      for i, body in events:
          urls.append(uri % (i,))
          yield agent.request(
              'PUT', urls[-1], headers, StringProducer(body))
          if len(urls) == samples:
              break
  
      # Now delete them all
      samples = yield sample(
          dtrace, samples,
          agent, (('DELETE', url) for url in urls).next)
      returnValue(samples)
  
  
subject: Add a benchmark for event deletion