p2pool/bitcoin/worker_interface.py

   1 from __future__ import division
   2
   3 import StringIO
   4 import json
   5 import random
   6 import sys
   7
   8 from twisted.internet import defer
   9
  10 import p2pool
  11 from p2pool.bitcoin import getwork
  12 from p2pool.util import expiring_dict, jsonrpc, variable
  13
  14 class _Page(jsonrpc.Server):
  15     def __init__(self, parent, long_poll):
  16         jsonrpc.Server.__init__(self)
  17         self.parent = parent
  18         self.long_poll = long_poll
  19
  20     def rpc_getwork(self, request, data=None):
  21         return self.parent._getwork(request, data, long_poll=self.long_poll)
  22
  23     def render_GET(self, request):
  24         request.content = StringIO.StringIO(json.dumps(dict(id=0, method='getwork')))
  25         return self.render_POST(request)
  26
  27 class WorkerBridge(object):
  28     def __init__(self):
  29         self.new_work_event = variable.Event()
  30
  31     def preprocess_request(self, request):
  32         return request, # *args to self.compute
  33
  34     def get_work(self, request):
  35         raise NotImplementedError()
  36
  37 class WorkerInterface(object):
  38     def __init__(self, worker_bridge):
  39         self.worker_bridge = worker_bridge
  40
  41         self.worker_views = {}
  42
  43         self.work_cache = {}
  44         self.work_cache_times = self.worker_bridge.new_work_event.times
  45
  46         self.merkle_root_to_handler = expiring_dict.ExpiringDict(300)
  47
  48     def attach_to(self, res):
  49         res.putChild('', _Page(self, long_poll=False))
  50         res.putChild('long-polling', _Page(self, long_poll=True))
  51
  52     @defer.inlineCallbacks
  53     def _getwork(self, request, data, long_poll):
  54         request.setHeader('X-Long-Polling', '/long-polling')
  55         request.setHeader('X-Roll-NTime', 'expire=10')
  56         request.setHeader('X-Is-P2Pool', 'true')
  57
  58         if data is not None:
  59             header = getwork.decode_data(data)
  60             if header['merkle_root'] not in self.merkle_root_to_handler:
  61                 print >>sys.stderr, '''Couldn't link returned work's merkle root with its handler. This should only happen if this process was recently restarted!'''
  62                 defer.returnValue(False)
  63             defer.returnValue(self.merkle_root_to_handler[header['merkle_root']](header, request))
  64
  65         if p2pool.DEBUG:
  66             id = random.randrange(1000, 10000)
  67             print 'POLL %i START is_long_poll=%r user_agent=%r user=%r' % (id, long_poll, request.getHeader('User-Agent'), request.getUser())
  68
  69         if long_poll:
  70             request_id = request.getClientIP(), request.getHeader('Authorization')
  71             if self.worker_views.get(request_id, self.worker_bridge.new_work_event.times) != self.worker_bridge.new_work_event.times:
  72                 if p2pool.DEBUG:
  73                     print 'POLL %i PUSH' % (id,)
  74             else:
  75                 if p2pool.DEBUG:
  76                     print 'POLL %i WAITING' % (id,)
  77                 yield self.worker_bridge.new_work_event.get_deferred()
  78             self.worker_views[request_id] = self.worker_bridge.new_work_event.times
  79
  80         key = self.worker_bridge.preprocess_request(request)
  81
  82         if self.work_cache_times != self.worker_bridge.new_work_event.times:
  83             self.work_cache = {}
  84             self.work_cache_times = self.worker_bridge.new_work_event.times
  85
  86         if key in self.work_cache:
  87             res, orig_timestamp, handler = self.work_cache.pop(key)
  88         else:
  89             res, handler = self.worker_bridge.get_work(*key)
  90             assert res.merkle_root not in self.merkle_root_to_handler
  91             orig_timestamp = res.timestamp
  92
  93         self.merkle_root_to_handler[res.merkle_root] = handler
  94
  95         if res.timestamp + 12 < orig_timestamp + 600:
  96             self.work_cache[key] = res.update(timestamp=res.timestamp + 12), orig_timestamp, handler
  97
  98         if p2pool.DEBUG:
  99             print 'POLL %i END identifier=%i' % (id, self.worker_bridge.new_work_event.times)
 100
 101         defer.returnValue(res.getwork(identifier=str(self.worker_bridge.new_work_event.times), submitold=True))