graphite listener is broken

[clofresh]

in datadog.conf:

graphite_listen_port: 17124

test script:

import socket
import struct
import pickle
import time

s = socket.socket()
s.connect(('localhost', 17124))
all_data = pickle.dumps([('test.metric', (time.time(), 1))])
size = struct.pack('!L', len(all_data))
s.sendall(size)
s.sendall(all_data)

The forwarder errors:

$ python ddagent.py
Log file is unwritable: '/var/log/datadog/forwarder.log'
2013-03-19 11:31:35,966 | INFO | dd.forwarder | root(ddagent.py:106) | Done with custom emitters
2013-03-19 11:31:35,966 | WARNING | dd.forwarder | forwarder(ddagent.py:153) | You are a Datadog user so we will send data to https://app.datadoghq.com
2013-03-19 11:31:35,969 | INFO | dd.forwarder | forwarder(ddagent.py:373) | Listening on port 17123
2013-03-19 11:31:35,969 | INFO | dd.forwarder | forwarder(ddagent.py:390) | Starting graphite listener on port 17124
2013-03-19 11:31:40,983 | DEBUG | dd.forwarder | forwarder(ddagent.py:171) | Created transaction 1
2013-03-19 11:31:40,984 | DEBUG | dd.forwarder | forwarder(ddagent.py:186) | Sending metrics to endpoint dd_url at http://localhost:9000/intake?api_key=apikey_2
2013-03-19 11:31:40,984 | ERROR | dd.forwarder | transaction(transaction.py:180) |
Traceback (most recent call last):
  File "/Users/carlo/Projects/datadog/dd-agent/transaction.py", line 178, in flush_next
    tr.flush()
  File "ddagent.py", line 201, in flush
    ca_certs=ssl_certificate
  File "/Users/carlo/Projects/datadog/tornado/tornado/httpclient.py", line 303, in __init__
    self.body = utf8(body)
  File "/Users/carlo/Projects/datadog/tornado/tornado/escape.py", line 168, in utf8
    assert isinstance(value, unicode)
AssertionError
2013-03-19 11:31:40,985 | WARNING | dd.forwarder | transaction(transaction.py:200) | Transaction 1 in error (1 error), it will be replayed after 2013-03-19 11:32:00