client

   1 #!/usr/bin/python3
   2
   3 from hippotat import *
   4
   5 import twisted.web
   6 import twisted.web.client
   7
   8 client_cs = None
   9
  10 def set_client(ci,cs,pw):
  11   global client_cs
  12   global password
  13   assert(client_cs is None)
  14   client_cs = cs
  15   c.client = ci
  16   c.max_outstanding = cfg.getint(cs, 'max_requests_outstanding')
  17   c.target_outstanding = cfg.getint(cs, 'target_requests_outstanding')
  18   password = pw
  19
  20 def process_cfg():
  21   global url
  22   global max_requests_outstanding
  23
  24   process_cfg_common_always()
  25   process_cfg_server()
  26
  27   try:
  28     c.url = cfg.get('server','url')
  29   except NoOptionError:
  30     process_cfg_saddrs()
  31     c.url = c.saddrs[0].url()
  32
  33   process_cfg_clients(set_client)
  34
  35   c.routes = cfg.get('virtual','routes')
  36   c.max_queue_time = cfg.getint(client_cs, 'max_queue_time')
  37   c.max_batch_up   = cfg.getint(client_cs, 'max_batch_up')
  38   c.http_timeout   = cfg.getint(client_cs, 'http_timeout')
  39
  40   process_cfg_ipif(client_cs,
  41                    (('local', 'client'),
  42                     ('peer',  'server'),
  43                     ('rnets', 'routes')))
  44
  45 outstanding = 0
  46
  47 def start_client():
  48   global queue
  49   global agent
  50   queue = PacketQueue(c.max_queue_time)
  51   agent = twisted.web.client.Agent(reactor, connectTimeout = c.http_timeout)
  52
  53 def outbound(packet, saddr, daddr):
  54   #print('OUT ', saddr, daddr, repr(packet))
  55   queue.append(packet)
  56   check_outbound()
  57
  58 class ResponseConsumer(twisted.internet.protocol.Protocol):
  59   def __init__(self):
  60     self._ssd = SlipStreamDecoder(queue_inbound)
  61   def dataReceived(self, data):
  62     self._ssd.inputdata(mime_translate(data))
  63   def connectionMade(self): pass
  64   def connectionLost(self, reason):
  65     if isinstance(reason, twisted.internet.error.ConnectionDone):
  66       self._ssd.flush()
  67     else:
  68       print(reason, file=sys.stderr)
  69
  70 def req_ok(resp):
  71   resp.deliverBody(ResponseConsumer())
  72
  73 def req_err(err):
  74   print(err, file=sys.stderr)
  75
  76 def req_fin(*args):
  77   global outstanding
  78   outstanding -= 1
  79
  80 def check_outbound():
  81   global outstanding
  82   while True:
  83     if                          outstanding >= c.max_outstanding   : break
  84     if not queue.nonempty() and outstanding >= c.target_outstanding: break
  85
  86     d = b''
  87     def moredata(s): nonlocal d; d += s
  88     queue.process((lambda: len(d)),
  89                   moredata,
  90                   c.max_batch_up)
  91
  92     crlf = b'\r\n'
  93     mime = (b'--b'                                      + crlf +
  94             b'Content-Disposition: form-data; name="m"' + crlf +
  95             password                                    + crlf +
  96             str(c.client)             .encode('ascii')  + crlf +
  97             str(c.target_outstanding) .encode('ascii')  + crlf +
  98             b'--b'                                      + crlf +
  99             b'Content-Disposition: form-data; name="d"' + crlf +
 100             mime_translate(d)                           + crlf +
 101             b'--b--'                                    + crlf)
 102
 103     hh = { 'User-Agent': ['hippotat'],
 104            'Content-Type': ['multipart/form-data; boundary="b"'] }
 105     req = agent.request(b'POST',
 106                         c.url,
 107                         twisted.web.client.Headers(hh))
 108     req.addTimeout(c.http_timeout, reactor)
 109     req.addCallbacks(req_ok, req_err)
 110     req.addBoth(req_fin)
 111     outstanding += 1
 112
 113 common_startup()
 114 process_cfg()
 115 start_client()
 116 start_ipif(c.ipif_command, outbound)
 117 common_run()