processor.py

   1 import json
   2 import socket
   3 import threading
   4 import time
   5 import traceback, sys
   6 import Queue as queue
   7
   8 def random_string(N):
   9     import random, string
  10     return ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(N))
  11
  12 def timestr():
  13     return time.strftime("[%d/%m/%Y-%H:%M:%S]")
  14
  15
  16 class Shared:
  17
  18     def __init__(self):
  19         self.lock = threading.Lock()
  20         self._stopped = False
  21
  22     def stop(self):
  23         print "Stopping Stratum"
  24         with self.lock:
  25             self._stopped = True
  26
  27     def stopped(self):
  28         with self.lock:
  29             return self._stopped
  30
  31
  32 class Processor(threading.Thread):
  33
  34     def __init__(self):
  35         threading.Thread.__init__(self)
  36         self.daemon = True
  37         self.dispatcher = None
  38         self.queue = queue.Queue()
  39
  40     def process(self, request):
  41         pass
  42
  43     def push_response(self, response):
  44         #print "response", response
  45         self.dispatcher.request_dispatcher.push_response(response)
  46
  47     def run(self):
  48         while not self.shared.stopped():
  49             request = self.queue.get(10000000000)
  50             try:
  51                 self.process(request)
  52             except:
  53                 traceback.print_exc(file=sys.stdout)
  54
  55         print "processor terminating"
  56
  57
  58
  59 class Dispatcher:
  60
  61     def __init__(self):
  62         self.shared = Shared()
  63         self.request_dispatcher = RequestDispatcher(self.shared)
  64         self.request_dispatcher.start()
  65         self.response_dispatcher = \
  66             ResponseDispatcher(self.shared, self.request_dispatcher)
  67         self.response_dispatcher.start()
  68
  69     def register(self, prefix, processor):
  70         processor.dispatcher = self
  71         processor.shared = self.shared
  72         processor.start()
  73         self.request_dispatcher.processors[prefix] = processor
  74
  75
  76
  77 class RequestDispatcher(threading.Thread):
  78
  79     def __init__(self, shared):
  80         self.shared = shared
  81         threading.Thread.__init__(self)
  82         self.daemon = True
  83         self.request_queue = queue.Queue()
  84         self.response_queue = queue.Queue()
  85         self.internal_ids = {}
  86         self.internal_id = 1
  87         self.lock = threading.Lock()
  88         self.sessions = []
  89         self.processors = {}
  90
  91     def push_response(self, item):
  92         self.response_queue.put(item)
  93
  94     def pop_response(self):
  95         return self.response_queue.get()
  96
  97     def push_request(self, session, item):
  98         self.request_queue.put((session,item))
  99
 100     def pop_request(self):
 101         return self.request_queue.get()
 102
 103     def get_session_by_address(self, address):
 104         for x in self.sessions:
 105             if x.address == address:
 106                 return x
 107
 108     def get_session_id(self, internal_id):
 109         with self.lock:
 110             return self.internal_ids.pop(internal_id)
 111
 112     def store_session_id(self, session, msgid):
 113         with self.lock:
 114             self.internal_ids[self.internal_id] = session, msgid
 115             r = self.internal_id
 116             self.internal_id += 1
 117             return r
 118
 119     def run(self):
 120         if self.shared is None:
 121             raise TypeError("self.shared not set in Processor")
 122         while not self.shared.stopped():
 123             session, request = self.pop_request()
 124             try:
 125                 self.do_dispatch(session, request)
 126             except:
 127                 traceback.print_exc(file=sys.stdout)
 128
 129
 130         self.stop()
 131
 132     def stop(self):
 133         pass
 134
 135     def do_dispatch(self, session, request):
 136         """ dispatch request to the relevant processor """
 137
 138         method = request['method']
 139         params = request.get('params',[])
 140         suffix = method.split('.')[-1]
 141
 142         try:
 143             is_new = float(session.version) >= 1.3
 144         except:
 145             is_new = False
 146
 147         if is_new and method == 'blockchain.address.get_history':
 148             method = 'blockchain.address.get_history2'
 149             request['method'] = method
 150
 151         if suffix == 'subscribe':
 152             if is_new and method == 'blockchain.address.subscribe':
 153                 method = 'blockchain.address.subscribe2'
 154                 request['method'] = method
 155
 156             session.subscribe_to_service(method, params)
 157
 158         # store session and id locally
 159         request['id'] = self.store_session_id(session, request['id'])
 160
 161         prefix = request['method'].split('.')[0]
 162         try:
 163             p = self.processors[prefix]
 164         except:
 165             print "error: no processor for", prefix
 166             return
 167
 168         p.queue.put(request)
 169
 170         if method in ['server.version']:
 171             session.version = params[0]
 172
 173     def get_sessions(self):
 174         with self.lock:
 175             r = self.sessions[:]
 176         return r
 177
 178     def add_session(self, session):
 179         with self.lock:
 180             self.sessions.append(session)
 181
 182     def collect_garbage(self):
 183         # Deep copy entire sessions list and blank it
 184         # This is done to minimise lock contention
 185         with self.lock:
 186             sessions = self.sessions[:]
 187             self.sessions = []
 188         for session in sessions:
 189             if not session.stopped():
 190                 # If session is still alive then re-add it back
 191                 # to our internal register
 192                 self.add_session(session)
 193
 194
 195 class Session:
 196
 197     def __init__(self):
 198         self._stopped = False
 199         self.lock = threading.Lock()
 200         self.subscriptions = []
 201         self.address = ''
 202         self.name = ''
 203         self.version = 'unknown'
 204         self.time = time.time()
 205         threading.Timer(2, self.info).start()
 206
 207     # Debugging method. Doesn't need to be threadsafe.
 208     def info(self):
 209         for sub in self.subscriptions:
 210             #print sub
 211             method = sub[0]
 212             if method == 'blockchain.address.subscribe':
 213                 addr = sub[1]
 214                 break
 215         else:
 216             addr = None
 217
 218         if self.subscriptions:
 219             print timestr(), self.name, self.address, addr,\
 220                 len(self.subscriptions), self.version
 221
 222     def stopped(self):
 223         with self.lock:
 224             return self._stopped
 225
 226     def subscribe_to_service(self, method, params):
 227         subdesc = self.build_subdesc(method, params)
 228         with self.lock:
 229             if subdesc is not None:
 230                 self.subscriptions.append(subdesc)
 231
 232     # subdesc = A subscription description
 233     @staticmethod
 234     def build_subdesc(method, params):
 235         if method == "blockchain.numblocks.subscribe":
 236             return method,
 237         elif method == "blockchain.headers.subscribe":
 238             return method,
 239         elif method in ["blockchain.address.subscribe", "blockchain.address.subscribe2"]:
 240             if not params:
 241                 return None
 242             else:
 243                 return method, params[0]
 244         else:
 245             return None
 246
 247     def contains_subscription(self, subdesc):
 248         with self.lock:
 249             return subdesc in self.subscriptions
 250
 251
 252 class ResponseDispatcher(threading.Thread):
 253
 254     def __init__(self, shared, processor):
 255         self.shared = shared
 256         self.processor = processor
 257         threading.Thread.__init__(self)
 258         self.daemon = True
 259
 260     def run(self):
 261         while not self.shared.stopped():
 262             self.update()
 263
 264     def update(self):
 265         response = self.processor.pop_response()
 266         #print "pop response", response
 267         internal_id = response.get('id')
 268         method = response.get('method')
 269         params = response.get('params')
 270
 271         if method == "blockchain.address.subscribe2":
 272             method = "blockchain.address.subscribe"
 273
 274         # A notification
 275         if internal_id is None: # and method is not None and params is not None:
 276             self.notification(method, params, response)
 277         # A response
 278         elif internal_id is not None: # and method is None and params is None:
 279             self.send_response(internal_id, response)
 280         else:
 281             print "no method", response
 282
 283     def notification(self, method, params, response):
 284         subdesc = Session.build_subdesc(method, params)
 285         for session in self.processor.sessions:
 286             if session.stopped():
 287                 continue
 288             if session.contains_subscription(subdesc):
 289                 session.send_response(response)
 290
 291     def send_response(self, internal_id, response):
 292         session, message_id = self.processor.get_session_id(internal_id)
 293         if session:
 294             response['id'] = message_id
 295             session.send_response(response)
 296         else:
 297             print "send_response: no session", message_id, internal_id, response
 298