processor.py

   1 import json
   2 import Queue as queue
   3 import socket
   4 import threading
   5 import time
   6 import traceback
   7 import sys
   8
   9 from utils import random_string, timestr, print_log
  10
  11
  12 class Shared:
  13
  14     def __init__(self, config):
  15         self.lock = threading.Lock()
  16         self._stopped = False
  17         self.config = config
  18
  19     def stop(self):
  20         print_log("Stopping Stratum")
  21         with self.lock:
  22             self._stopped = True
  23
  24     def stopped(self):
  25         with self.lock:
  26             return self._stopped
  27
  28
  29 class Processor(threading.Thread):
  30
  31     def __init__(self):
  32         threading.Thread.__init__(self)
  33         self.daemon = True
  34         self.dispatcher = None
  35         self.queue = queue.Queue()
  36
  37     def process(self, session, request):
  38         pass
  39
  40     def add_request(self, session, request):
  41         self.queue.put((session, request))
  42
  43     def push_response(self, session, response):
  44         #print "response", response
  45         self.dispatcher.request_dispatcher.push_response(session, response)
  46
  47     def run(self):
  48         while not self.shared.stopped():
  49             request, session = self.queue.get(10000000000)
  50             try:
  51                 self.process(request, session)
  52             except:
  53                 traceback.print_exc(file=sys.stdout)
  54
  55         print_log("processor terminating")
  56
  57
  58 class Dispatcher:
  59
  60     def __init__(self, config):
  61         self.shared = Shared(config)
  62         self.request_dispatcher = RequestDispatcher(self.shared)
  63         self.request_dispatcher.start()
  64         self.response_dispatcher = \
  65             ResponseDispatcher(self.shared, self.request_dispatcher)
  66         self.response_dispatcher.start()
  67
  68     def register(self, prefix, processor):
  69         processor.dispatcher = self
  70         processor.shared = self.shared
  71         processor.start()
  72         self.request_dispatcher.processors[prefix] = processor
  73
  74
  75 class RequestDispatcher(threading.Thread):
  76
  77     def __init__(self, shared):
  78         self.shared = shared
  79         threading.Thread.__init__(self)
  80         self.daemon = True
  81         self.request_queue = queue.Queue()
  82         self.response_queue = queue.Queue()
  83         self.lock = threading.Lock()
  84         self.idlock = threading.Lock()
  85         self.sessions = []
  86         self.processors = {}
  87
  88     def push_response(self, session, item):
  89         self.response_queue.put((session, item))
  90
  91     def pop_response(self):
  92         return self.response_queue.get()
  93
  94     def push_request(self, session, item):
  95         self.request_queue.put((session, item))
  96
  97     def pop_request(self):
  98         return self.request_queue.get()
  99
 100     def run(self):
 101         if self.shared is None:
 102             raise TypeError("self.shared not set in Processor")
 103         while not self.shared.stopped():
 104             session, request = self.pop_request()
 105             try:
 106                 self.do_dispatch(session, request)
 107             except:
 108                 traceback.print_exc(file=sys.stdout)
 109
 110         self.stop()
 111
 112     def stop(self):
 113         pass
 114
 115     def do_dispatch(self, session, request):
 116         """ dispatch request to the relevant processor """
 117
 118         method = request['method']
 119         params = request.get('params', [])
 120         suffix = method.split('.')[-1]
 121
 122         if session is not None:
 123             if suffix == 'subscribe':
 124                 session.subscribe_to_service(method, params)
 125
 126         prefix = request['method'].split('.')[0]
 127         try:
 128             p = self.processors[prefix]
 129         except:
 130             print_log("error: no processor for", prefix)
 131             return
 132
 133         p.add_request(session, request)
 134
 135         if method in ['server.version']:
 136             session.version = params[0]
 137             try:
 138                 session.protocol_version = float(params[1])
 139             except:
 140                 pass
 141
 142
 143     def get_sessions(self):
 144         with self.lock:
 145             r = self.sessions[:]
 146         return r
 147
 148     def add_session(self, session):
 149         with self.lock:
 150             self.sessions.append(session)
 151
 152     def collect_garbage(self):
 153         # Deep copy entire sessions list and blank it
 154         # This is done to minimize lock contention
 155         with self.lock:
 156             sessions = self.sessions[:]
 157
 158         active_sessions = []
 159
 160         now = time.time()
 161         for session in sessions:
 162             if (now - session.time) > 1000:
 163                 session.stop()
 164
 165         bp = self.processors['blockchain']
 166
 167         for session in sessions:
 168             if not session.stopped():
 169                 # If session is still alive then re-add it back
 170                 # to our internal register
 171                 active_sessions.append(session)
 172             else:
 173                 session.stop_subscriptions(bp)
 174
 175         with self.lock:
 176             self.sessions = active_sessions[:]
 177
 178
 179
 180 class Session:
 181
 182     def __init__(self):
 183         self._stopped = False
 184         self.lock = threading.Lock()
 185         self.subscriptions = []
 186         self.address = ''
 187         self.name = ''
 188         self.version = 'unknown'
 189         self.protocol_version = 0.
 190         self.time = time.time()
 191         threading.Timer(2, self.info).start()
 192
 193
 194     # Debugging method. Doesn't need to be threadsafe.
 195     def info(self):
 196         for sub in self.subscriptions:
 197             #print sub
 198             method = sub[0]
 199             if method == 'blockchain.address.subscribe':
 200                 addr = sub[1]
 201                 break
 202         else:
 203             addr = None
 204
 205         if self.subscriptions:
 206             print_log("%4s" % self.name,
 207                       "%15s" % self.address,
 208                       "%35s" % addr,
 209                       "%3d" % len(self.subscriptions),
 210                       self.version)
 211
 212     def stopped(self):
 213         with self.lock:
 214             return self._stopped
 215
 216
 217     def subscribe_to_service(self, method, params):
 218         with self.lock:
 219             if (method, params) not in self.subscriptions:
 220                 self.subscriptions.append((method,params))
 221
 222
 223     def stop_subscriptions(self, bp):
 224         with self.lock:
 225             s = self.subscriptions[:]
 226
 227         for method, params in s:
 228             with bp.watch_lock:
 229                 if method == 'blockchain.numblocks.subscribe':
 230                     if self in bp.watch_blocks:
 231                         bp.watch_blocks.remove(self)
 232                 elif method == 'blockchain.headers.subscribe':
 233                     if self in bp.watch_headers:
 234                         bp.watch_headers.remove(self)
 235                 elif method == "blockchain.address.subscribe":
 236                     addr = params[0]
 237                     l = bp.watched_addresses.get(addr)
 238                     if not l:
 239                         continue
 240                     if self in l:
 241                         l.remove(self)
 242                     if l == []:
 243                         bp.watched_addresses.pop(addr)
 244
 245         with self.lock:
 246             self.subscriptions = []
 247
 248
 249 class ResponseDispatcher(threading.Thread):
 250
 251     def __init__(self, shared, request_dispatcher):
 252         self.shared = shared
 253         self.request_dispatcher = request_dispatcher
 254         threading.Thread.__init__(self)
 255         self.daemon = True
 256
 257     def run(self):
 258         while not self.shared.stopped():
 259             session, response = self.request_dispatcher.pop_response()
 260             session.send_response(response)