transports/stratum_tcp.py

   1 import json
   2 import Queue as queue
   3 import socket
   4 import threading
   5 import time
   6 import traceback, sys
   7
   8 from processor import Session, Dispatcher
   9 from utils import print_log
  10
  11
  12 class TcpSession(Session):
  13
  14     def __init__(self, connection, address, use_ssl, ssl_certfile, ssl_keyfile):
  15         Session.__init__(self)
  16         self.use_ssl = use_ssl
  17         if use_ssl:
  18             import ssl
  19             self._connection = ssl.wrap_socket(
  20                 connection,
  21                 server_side=True,
  22                 certfile=ssl_certfile,
  23                 keyfile=ssl_keyfile,
  24                 ssl_version=ssl.PROTOCOL_SSLv23,
  25                 do_handshake_on_connect=False)
  26         else:
  27             self._connection = connection
  28
  29         self.address = address[0]
  30         self.name = "TCP " if not use_ssl else "SSL "
  31         self.response_queue = queue.Queue()
  32
  33     def do_handshake(self):
  34         if self.use_ssl:
  35             self._connection.do_handshake()
  36
  37     def connection(self):
  38         if self.stopped():
  39             raise Exception("Session was stopped")
  40         else:
  41             return self._connection
  42
  43     def stop(self):
  44         if self.stopped():
  45             return
  46
  47         try:
  48             self._connection.shutdown(socket.SHUT_RDWR)
  49         except:
  50             # print_log("problem shutting down", self.address)
  51             # traceback.print_exc(file=sys.stdout)
  52             pass
  53
  54         self._connection.close()
  55         with self.lock:
  56             self._stopped = True
  57
  58     def send_response(self, response):
  59         self.response_queue.put(response)
  60
  61
  62 class TcpClientResponder(threading.Thread):
  63
  64     def __init__(self, session):
  65         self.session = session
  66         threading.Thread.__init__(self)
  67
  68     def run(self):
  69         while not self.session.stopped():
  70             response = self.session.response_queue.get()
  71             data = json.dumps(response) + "\n"
  72             try:
  73                 while data:
  74                     l = self.session.connection().send(data)
  75                     data = data[l:]
  76             except:
  77                 self.session.stop()
  78
  79
  80
  81 class TcpClientRequestor(threading.Thread):
  82
  83     def __init__(self, dispatcher, session):
  84         self.shared = dispatcher.shared
  85         self.dispatcher = dispatcher
  86         self.message = ""
  87         self.session = session
  88         threading.Thread.__init__(self)
  89
  90     def run(self):
  91         try:
  92             self.session.do_handshake()
  93         except:
  94             return
  95
  96         while not self.shared.stopped():
  97             if not self.update():
  98                 break
  99
 100             self.session.time = time.time()
 101
 102             while self.parse():
 103                 pass
 104
 105     def update(self):
 106         data = self.receive()
 107         if not data:
 108             # close_session
 109             self.session.stop()
 110             return False
 111
 112         self.message += data
 113         return True
 114
 115     def receive(self):
 116         try:
 117             return self.session.connection().recv(2048)
 118         except:
 119             return ''
 120
 121     def parse(self):
 122         raw_buffer = self.message.find('\n')
 123         if raw_buffer == -1:
 124             return False
 125
 126         raw_command = self.message[0:raw_buffer].strip()
 127         self.message = self.message[raw_buffer + 1:]
 128         if raw_command == 'quit':
 129             self.session.stop()
 130             return False
 131
 132         try:
 133             command = json.loads(raw_command)
 134         except:
 135             self.dispatcher.push_response({"error": "bad JSON", "request": raw_command})
 136             return True
 137
 138         try:
 139             # Try to load vital fields, and return an error if
 140             # unsuccessful.
 141             message_id = command['id']
 142             method = command['method']
 143         except KeyError:
 144             # Return an error JSON in response.
 145             self.dispatcher.push_response({"error": "syntax error", "request": raw_command})
 146         else:
 147             self.dispatcher.push_request(self.session, command)
 148
 149         return True
 150
 151
 152 class TcpServer(threading.Thread):
 153
 154     def __init__(self, dispatcher, host, port, use_ssl, ssl_certfile, ssl_keyfile):
 155         self.shared = dispatcher.shared
 156         self.dispatcher = dispatcher.request_dispatcher
 157         threading.Thread.__init__(self)
 158         self.daemon = True
 159         self.host = host
 160         self.port = port
 161         self.lock = threading.Lock()
 162         self.use_ssl = use_ssl
 163         self.ssl_keyfile = ssl_keyfile
 164         self.ssl_certfile = ssl_certfile
 165
 166     def run(self):
 167         print_log( ("SSL" if self.use_ssl else "TCP") + " server started on port %d"%self.port)
 168         sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 169         sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
 170         sock.bind((self.host, self.port))
 171         sock.listen(5)
 172
 173         while not self.shared.stopped():
 174
 175             #if self.use_ssl: print_log("SSL: socket listening")
 176             try:
 177                 connection, address = sock.accept()
 178             except:
 179                 traceback.print_exc(file=sys.stdout)
 180                 time.sleep(0.1)
 181                 continue
 182
 183             #if self.use_ssl: print_log("SSL: new session", address)
 184             try:
 185                 session = TcpSession(connection, address, use_ssl=self.use_ssl, ssl_certfile=self.ssl_certfile, ssl_keyfile=self.ssl_keyfile)
 186             except BaseException, e:
 187                 error = str(e)
 188                 print_log("cannot start TCP session", error, address)
 189                 connection.close()
 190                 time.sleep(0.1)
 191                 continue
 192
 193             self.dispatcher.add_session(session)
 194             self.dispatcher.collect_garbage()
 195             client_req = TcpClientRequestor(self.dispatcher, session)
 196             client_req.start()
 197             responder = TcpClientResponder(session)
 198             responder.start()