1 from twisted.internet import defer, task
2 from twisted.python import log
4 from p2pool.bitcoin import data as bitcoin_data, getwork
5 from p2pool.util import deferral, forest, variable
7 class HeaderWrapper(object):
9 __slots__ = 'hash previous_hash'.split(' ')
12 def from_header(cls, header):
13 return cls(bitcoin_data.hash256(bitcoin_data.block_header_type.pack(header)), header['previous_block'])
15 def __init__(self, hash, previous_hash):
16 self.hash, self.previous_hash = hash, previous_hash
18 class HeightTracker(object):
19 '''Point this at a factory and let it take care of getting block heights'''
21 def __init__(self, rpc_proxy, factory, backlog_needed):
22 self._rpc_proxy = rpc_proxy
23 self._factory = factory
24 self._backlog_needed = backlog_needed
26 self._tracker = forest.Tracker()
28 self._watch1 = self._factory.new_headers.watch(self._heard_headers)
29 self._watch2 = self._factory.new_block.watch(self._request)
31 self._requested = set()
32 self._clear_task = task.LoopingCall(self._requested.clear)
33 self._clear_task.start(60)
35 self._last_notified_size = 0
37 self.updated = variable.Event()
39 self._think_task = task.LoopingCall(self._think)
40 self._think_task.start(15)
41 self._think2_task = task.LoopingCall(self._think2)
42 self._think2_task.start(15)
47 highest_head = max(self._tracker.heads, key=lambda h: self._tracker.get_height_and_last(h)[0]) if self._tracker.heads else None
48 if highest_head is None:
49 return # wait for think2
50 height, last = self._tracker.get_height_and_last(highest_head)
51 if height < self._backlog_needed:
54 log.err(None, 'Error in HeightTracker._think:')
56 @defer.inlineCallbacks
59 ba = getwork.BlockAttempt.from_getwork((yield self._rpc_proxy.rpc_getwork()))
60 self._request(ba.previous_block)
61 self.best_hash = ba.previous_block
63 log.err(None, 'Error in HeightTracker._think2:')
65 def _heard_headers(self, headers):
67 for header in headers:
68 hw = HeaderWrapper.from_header(header)
69 if hw.hash in self._tracker.shares:
74 self.updated.happened()
77 if len(self._tracker.shares) >= self._last_notified_size + 100:
78 print 'Have %i/%i block headers' % (len(self._tracker.shares), self._backlog_needed)
79 self._last_notified_size = len(self._tracker.shares)
81 @defer.inlineCallbacks
82 def _request(self, last):
83 if last in self._tracker.shares:
85 if last in self._requested:
87 self._requested.add(last)
88 (yield self._factory.getProtocol()).send_getheaders(version=1, have=[], last=last)
90 def get_height_rel_highest(self, block_hash):
91 # callers: highest height can change during yields!
92 best_height, best_last = self._tracker.get_height_and_last(self.best_hash)
93 height, last = self._tracker.get_height_and_last(block_hash)
95 return -1000000000 # XXX hack
96 return height - best_height
98 @defer.inlineCallbacks
99 def get_height_rel_highest_func(bitcoind, factory, current_work, net):
100 if '\ngetblock ' in (yield deferral.retry()(bitcoind.rpc_help)()):
101 @deferral.DeferredCacher
102 @defer.inlineCallbacks
103 def height_cacher(block_hash):
105 x = yield bitcoind.rpc_getblock('%x' % (block_hash,))
106 except jsonrpc.Error, e:
107 if e.code == -5 and not p2pool.DEBUG:
108 raise deferral.RetrySilentlyException()
110 defer.returnValue(x['blockcount'] if 'blockcount' in x else x['height'])
111 best_height_cached = variable.Variable((yield deferral.retry()(height_cacher)(current_work.value['previous_block'])))
112 def get_height_rel_highest(block_hash):
113 this_height = height_cacher.call_now(block_hash, 0)
114 best_height = height_cacher.call_now(current_work.value['previous_block'], 0)
115 best_height_cached.set(max(best_height_cached.value, this_height, best_height))
116 return this_height - best_height_cached.value
118 get_height_rel_highest = HeightTracker(bitcoind, factory, 5*net.SHARE_PERIOD*net.CHAIN_LENGTH/net.PARENT.BLOCK_PERIOD).get_height_rel_highest
119 defer.returnValue(get_height_rel_highest)