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             self.do_dispatch(session, request)
 125
 126         self.stop()
 127
 128     def stop(self):
 129         pass
 130
 131     def do_dispatch(self, session, request):
 132         """ dispatch request to the relevant processor """
 133
 134         method = request['method']
 135         params = request.get('params',[])
 136         suffix = method.split('.')[-1]
 137         if suffix == 'subscribe':
 138             session.subscribe_to_service(method, params)
 139
 140         # store session and id locally
 141         request['id'] = self.store_session_id(session, request['id'])
 142
 143         prefix = request['method'].split('.')[0]
 144         try:
 145             p = self.processors[prefix]
 146         except:
 147             print "error: no processor for", prefix
 148             return
 149
 150         p.queue.put(request)
 151
 152         if method in ['server.version']:
 153             session.version = params[0]
 154
 155     def get_sessions(self):
 156         with self.lock:
 157             r = self.sessions[:]
 158         return r
 159
 160     def add_session(self, session):
 161         with self.lock:
 162             self.sessions.append(session)
 163
 164     def collect_garbage(self):
 165         # Deep copy entire sessions list and blank it
 166         # This is done to minimise lock contention
 167         with self.lock:
 168             sessions = self.sessions[:]
 169             self.sessions = []
 170         for session in sessions:
 171             if not session.stopped():
 172                 # If session is still alive then re-add it back
 173                 # to our internal register
 174                 self.add_session(session)
 175
 176
 177 class Session:
 178
 179     def __init__(self):
 180         self._stopped = False
 181         self.lock = threading.Lock()
 182         self.subscriptions = []
 183         self.address = ''
 184         self.name = ''
 185         self.version = 'unknown'
 186         self.time = time.time()
 187         threading.Timer(2, self.info).start()
 188
 189     # Debugging method. Doesn't need to be threadsafe.
 190     def info(self):
 191         for sub in self.subscriptions:
 192             #print sub
 193             method = sub[0]
 194             if method == 'blockchain.address.subscribe':
 195                 addr = sub[1]
 196                 break
 197         else:
 198             addr = None
 199
 200         if self.subscriptions:
 201             print timestr(), self.name, self.address, addr,\
 202                 len(self.subscriptions), self.version
 203
 204     def stopped(self):
 205         with self.lock:
 206             return self._stopped
 207
 208     def subscribe_to_service(self, method, params):
 209         subdesc = self.build_subdesc(method, params)
 210         with self.lock:
 211             if subdesc is not None:
 212                 self.subscriptions.append(subdesc)
 213
 214     # subdesc = A subscription description
 215     @staticmethod
 216     def build_subdesc(method, params):
 217         if method == "blockchain.numblocks.subscribe":
 218             return method,
 219         elif method == "blockchain.address.subscribe":
 220             if not params:
 221                 return None
 222             else:
 223                 return method, params[0]
 224         else:
 225             return None
 226
 227     def contains_subscription(self, subdesc):
 228         with self.lock:
 229             return subdesc in self.subscriptions
 230
 231
 232 class ResponseDispatcher(threading.Thread):
 233
 234     def __init__(self, shared, processor):
 235         self.shared = shared
 236         self.processor = processor
 237         threading.Thread.__init__(self)
 238         self.daemon = True
 239
 240     def run(self):
 241         while not self.shared.stopped():
 242             self.update()
 243
 244     def update(self):
 245         response = self.processor.pop_response()
 246         #print "pop response", response
 247         internal_id = response.get('id')
 248         method = response.get('method')
 249         params = response.get('params')
 250
 251         # A notification
 252         if internal_id is None: # and method is not None and params is not None:
 253             self.notification(method, params, response)
 254         # A response
 255         elif internal_id is not None: # and method is None and params is None:
 256             self.send_response(internal_id, response)
 257         else:
 258             print "no method", response
 259
 260     def notification(self, method, params, response):
 261         subdesc = Session.build_subdesc(method, params)
 262         for session in self.processor.sessions:
 263             if session.stopped():
 264                 continue
 265             if session.contains_subscription(subdesc):
 266                 session.send_response(response)
 267
 268     def send_response(self, internal_id, response):
 269         session, message_id = self.processor.get_session_id(internal_id)
 270         if session:
 271             response['id'] = message_id
 272             session.send_response(response)
 273         else:
 274             print "send_response: no session", message_id, internal_id, response
 275