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         if suffix == 'subscribe':
 142             session.subscribe_to_service(method, params)
 143
 144         # store session and id locally
 145         request['id'] = self.store_session_id(session, request['id'])
 146
 147         prefix = request['method'].split('.')[0]
 148         try:
 149             p = self.processors[prefix]
 150         except:
 151             print "error: no processor for", prefix
 152             return
 153
 154         p.queue.put(request)
 155
 156         if method in ['server.version']:
 157             session.version = params[0]
 158
 159     def get_sessions(self):
 160         with self.lock:
 161             r = self.sessions[:]
 162         return r
 163
 164     def add_session(self, session):
 165         with self.lock:
 166             self.sessions.append(session)
 167
 168     def collect_garbage(self):
 169         # Deep copy entire sessions list and blank it
 170         # This is done to minimise lock contention
 171         with self.lock:
 172             sessions = self.sessions[:]
 173             self.sessions = []
 174         for session in sessions:
 175             if not session.stopped():
 176                 # If session is still alive then re-add it back
 177                 # to our internal register
 178                 self.add_session(session)
 179
 180
 181 class Session:
 182
 183     def __init__(self):
 184         self._stopped = False
 185         self.lock = threading.Lock()
 186         self.subscriptions = []
 187         self.address = ''
 188         self.name = ''
 189         self.version = 'unknown'
 190         self.time = time.time()
 191         threading.Timer(2, self.info).start()
 192
 193     # Debugging method. Doesn't need to be threadsafe.
 194     def info(self):
 195         for sub in self.subscriptions:
 196             #print sub
 197             method = sub[0]
 198             if method == 'blockchain.address.subscribe':
 199                 addr = sub[1]
 200                 break
 201         else:
 202             addr = None
 203
 204         if self.subscriptions:
 205             print timestr(), self.name, self.address, addr,\
 206                 len(self.subscriptions), self.version
 207
 208     def stopped(self):
 209         with self.lock:
 210             return self._stopped
 211
 212     def subscribe_to_service(self, method, params):
 213         subdesc = self.build_subdesc(method, params)
 214         with self.lock:
 215             if subdesc is not None:
 216                 self.subscriptions.append(subdesc)
 217
 218     # subdesc = A subscription description
 219     @staticmethod
 220     def build_subdesc(method, params):
 221         if method == "blockchain.numblocks.subscribe":
 222             return method,
 223         elif method == "blockchain.address.subscribe":
 224             if not params:
 225                 return None
 226             else:
 227                 return method, params[0]
 228         else:
 229             return None
 230
 231     def contains_subscription(self, subdesc):
 232         with self.lock:
 233             return subdesc in self.subscriptions
 234
 235
 236 class ResponseDispatcher(threading.Thread):
 237
 238     def __init__(self, shared, processor):
 239         self.shared = shared
 240         self.processor = processor
 241         threading.Thread.__init__(self)
 242         self.daemon = True
 243
 244     def run(self):
 245         while not self.shared.stopped():
 246             self.update()
 247
 248     def update(self):
 249         response = self.processor.pop_response()
 250         #print "pop response", response
 251         internal_id = response.get('id')
 252         method = response.get('method')
 253         params = response.get('params')
 254
 255         # A notification
 256         if internal_id is None: # and method is not None and params is not None:
 257             self.notification(method, params, response)
 258         # A response
 259         elif internal_id is not None: # and method is None and params is None:
 260             self.send_response(internal_id, response)
 261         else:
 262             print "no method", response
 263
 264     def notification(self, method, params, response):
 265         subdesc = Session.build_subdesc(method, params)
 266         for session in self.processor.sessions:
 267             if session.stopped():
 268                 continue
 269             if session.contains_subscription(subdesc):
 270                 session.send_response(response)
 271
 272     def send_response(self, internal_id, response):
 273         session, message_id = self.processor.get_session_id(internal_id)
 274         if session:
 275             response['id'] = message_id
 276             session.send_response(response)
 277         else:
 278             print "send_response: no session", message_id, internal_id, response
 279