p2pool/web.py

   1 from __future__ import division
   2
   3 import errno
   4 import json
   5 import os
   6 import sys
   7 import time
   8
   9 from twisted.internet import defer, task
  10 from twisted.python import log
  11 from twisted.web import resource, static
  12
  13 import p2pool
  14 from bitcoin import data as bitcoin_data
  15 from . import data as p2pool_data
  16 from util import deferred_resource, graph, math
  17
  18 def _atomic_read(filename):
  19     try:
  20         with open(filename, 'rb') as f:
  21             return f.read()
  22     except IOError, e:
  23         if e.errno != errno.ENOENT:
  24             raise
  25     try:
  26         with open(filename + '.new', 'rb') as f:
  27             return f.read()
  28     except IOError, e:
  29         if e.errno != errno.ENOENT:
  30             raise
  31     return None
  32
  33 def _atomic_write(filename, data):
  34     with open(filename + '.new', 'wb') as f:
  35         f.write(data)
  36         f.flush()
  37         try:
  38             os.fsync(f.fileno())
  39         except:
  40             pass
  41     try:
  42         os.rename(filename + '.new', filename)
  43     except: # XXX windows can't overwrite
  44         os.remove(filename)
  45         os.rename(filename + '.new', filename)
  46
  47 def get_web_root(tracker, bitcoind_work, get_current_txouts, datadir_path, net, get_stale_counts, my_pubkey_hash, local_rate_monitor, worker_fee, p2p_node, my_share_hashes, pseudoshare_received, share_received, best_share_var, bitcoin_warning_var, traffic_happened):
  48     start_time = time.time()
  49
  50     web_root = resource.Resource()
  51
  52     def get_users():
  53         height, last = tracker.get_height_and_last(best_share_var.value)
  54         weights, total_weight, donation_weight = tracker.get_cumulative_weights(best_share_var.value, min(height, 720), 65535*2**256)
  55         res = {}
  56         for script in sorted(weights, key=lambda s: weights[s]):
  57             res[bitcoin_data.script2_to_address(script, net.PARENT)] = weights[script]/total_weight
  58         return res
  59
  60     def get_current_scaled_txouts(scale, trunc=0):
  61         txouts = get_current_txouts()
  62         total = sum(txouts.itervalues())
  63         results = dict((script, value*scale//total) for script, value in txouts.iteritems())
  64         if trunc > 0:
  65             total_random = 0
  66             random_set = set()
  67             for s in sorted(results, key=results.__getitem__):
  68                 if results[s] >= trunc:
  69                     break
  70                 total_random += results[s]
  71                 random_set.add(s)
  72             if total_random:
  73                 winner = math.weighted_choice((script, results[script]) for script in random_set)
  74                 for script in random_set:
  75                     del results[script]
  76                 results[winner] = total_random
  77         if sum(results.itervalues()) < int(scale):
  78             results[math.weighted_choice(results.iteritems())] += int(scale) - sum(results.itervalues())
  79         return results
  80
  81     def get_patron_sendmany(total=None, trunc='0.01'):
  82         if total is None:
  83             return 'need total argument. go to patron_sendmany/<TOTAL>'
  84         total = int(float(total)*1e8)
  85         trunc = int(float(trunc)*1e8)
  86         return json.dumps(dict(
  87             (bitcoin_data.script2_to_address(script, net.PARENT), value/1e8)
  88             for script, value in get_current_scaled_txouts(total, trunc).iteritems()
  89             if bitcoin_data.script2_to_address(script, net.PARENT) is not None
  90         ))
  91
  92     def get_local_rates():
  93         miner_hash_rates = {}
  94         miner_dead_hash_rates = {}
  95         datums, dt = local_rate_monitor.get_datums_in_last()
  96         for datum in datums:
  97             miner_hash_rates[datum['user']] = miner_hash_rates.get(datum['user'], 0) + datum['work']/dt
  98             if datum['dead']:
  99                 miner_dead_hash_rates[datum['user']] = miner_dead_hash_rates.get(datum['user'], 0) + datum['work']/dt
 100         return miner_hash_rates, miner_dead_hash_rates
 101
 102     def get_global_stats():
 103         # averaged over last hour
 104         if tracker.get_height(best_share_var.value) < 10:
 105             return None
 106         lookbehind = min(tracker.get_height(best_share_var.value), 3600//net.SHARE_PERIOD)
 107
 108         nonstale_hash_rate = p2pool_data.get_pool_attempts_per_second(tracker, best_share_var.value, lookbehind)
 109         stale_prop = p2pool_data.get_average_stale_prop(tracker, best_share_var.value, lookbehind)
 110         return dict(
 111             pool_nonstale_hash_rate=nonstale_hash_rate,
 112             pool_hash_rate=nonstale_hash_rate/(1 - stale_prop),
 113             pool_stale_prop=stale_prop,
 114             min_difficulty=bitcoin_data.target_to_difficulty(tracker.items[best_share_var.value].max_target),
 115         )
 116
 117     def get_local_stats():
 118         if tracker.get_height(best_share_var.value) < 10:
 119             return None
 120         lookbehind = min(tracker.get_height(best_share_var.value), 3600//net.SHARE_PERIOD)
 121
 122         global_stale_prop = p2pool_data.get_average_stale_prop(tracker, best_share_var.value, lookbehind)
 123
 124         my_unstale_count = sum(1 for share in tracker.get_chain(best_share_var.value, lookbehind) if share.hash in my_share_hashes)
 125         my_orphan_count = sum(1 for share in tracker.get_chain(best_share_var.value, lookbehind) if share.hash in my_share_hashes and share.share_data['stale_info'] == 'orphan')
 126         my_doa_count = sum(1 for share in tracker.get_chain(best_share_var.value, lookbehind) if share.hash in my_share_hashes and share.share_data['stale_info'] == 'doa')
 127         my_share_count = my_unstale_count + my_orphan_count + my_doa_count
 128         my_stale_count = my_orphan_count + my_doa_count
 129
 130         my_stale_prop = my_stale_count/my_share_count if my_share_count != 0 else None
 131
 132         my_work = sum(bitcoin_data.target_to_average_attempts(share.target)
 133             for share in tracker.get_chain(best_share_var.value, lookbehind - 1)
 134             if share.hash in my_share_hashes)
 135         actual_time = (tracker.items[best_share_var.value].timestamp -
 136             tracker.items[tracker.get_nth_parent_hash(best_share_var.value, lookbehind - 1)].timestamp)
 137         share_att_s = my_work / actual_time
 138
 139         miner_hash_rates, miner_dead_hash_rates = get_local_rates()
 140         (stale_orphan_shares, stale_doa_shares), shares, _ = get_stale_counts()
 141
 142         return dict(
 143             my_hash_rates_in_last_hour=dict(
 144                 note="DEPRECATED",
 145                 nonstale=share_att_s,
 146                 rewarded=share_att_s/(1 - global_stale_prop),
 147                 actual=share_att_s/(1 - my_stale_prop) if my_stale_prop is not None else 0, # 0 because we don't have any shares anyway
 148             ),
 149             my_share_counts_in_last_hour=dict(
 150                 shares=my_share_count,
 151                 unstale_shares=my_unstale_count,
 152                 stale_shares=my_stale_count,
 153                 orphan_stale_shares=my_orphan_count,
 154                 doa_stale_shares=my_doa_count,
 155             ),
 156             my_stale_proportions_in_last_hour=dict(
 157                 stale=my_stale_prop,
 158                 orphan_stale=my_orphan_count/my_share_count if my_share_count != 0 else None,
 159                 dead_stale=my_doa_count/my_share_count if my_share_count != 0 else None,
 160             ),
 161             miner_hash_rates=miner_hash_rates,
 162             miner_dead_hash_rates=miner_dead_hash_rates,
 163             efficiency_if_miner_perfect=(1 - stale_orphan_shares/shares)/(1 - global_stale_prop) if shares else None, # ignores dead shares because those are miner's fault and indicated by pseudoshare rejection
 164             efficiency=(1 - (stale_orphan_shares+stale_doa_shares)/shares)/(1 - global_stale_prop) if shares else None,
 165             peers=dict(
 166                 incoming=sum(1 for peer in p2p_node.peers.itervalues() if peer.incoming),
 167                 outgoing=sum(1 for peer in p2p_node.peers.itervalues() if not peer.incoming),
 168             ),
 169             shares=dict(
 170                 total=shares,
 171                 orphan=stale_orphan_shares,
 172                 dead=stale_doa_shares,
 173             ),
 174             uptime=time.time() - start_time,
 175             attempts_to_share=bitcoin_data.target_to_average_attempts(tracker.items[best_share_var.value].max_target),
 176             attempts_to_block=bitcoin_data.target_to_average_attempts(bitcoind_work.value['bits'].target),
 177             block_value=bitcoind_work.value['subsidy']*1e-8,
 178             warnings=p2pool_data.get_warnings(tracker, best_share_var.value, net, bitcoin_warning_var.value, bitcoind_work.value),
 179         )
 180
 181     class WebInterface(deferred_resource.DeferredResource):
 182         def __init__(self, func, mime_type='application/json', args=()):
 183             deferred_resource.DeferredResource.__init__(self)
 184             self.func, self.mime_type, self.args = func, mime_type, args
 185
 186         def getChild(self, child, request):
 187             return WebInterface(self.func, self.mime_type, self.args + (child,))
 188
 189         @defer.inlineCallbacks
 190         def render_GET(self, request):
 191             request.setHeader('Content-Type', self.mime_type)
 192             request.setHeader('Access-Control-Allow-Origin', '*')
 193             res = yield self.func(*self.args)
 194             defer.returnValue(json.dumps(res) if self.mime_type == 'application/json' else res)
 195
 196     web_root.putChild('rate', WebInterface(lambda: p2pool_data.get_pool_attempts_per_second(tracker, best_share_var.value, 720)/(1-p2pool_data.get_average_stale_prop(tracker, best_share_var.value, 720))))
 197     web_root.putChild('difficulty', WebInterface(lambda: bitcoin_data.target_to_difficulty(tracker.items[best_share_var.value].max_target)))
 198     web_root.putChild('users', WebInterface(get_users))
 199     web_root.putChild('user_stales', WebInterface(lambda: dict((bitcoin_data.pubkey_hash_to_address(ph, net.PARENT), prop) for ph, prop in
 200         p2pool_data.get_user_stale_props(tracker, best_share_var.value, tracker.get_height(best_share_var.value)).iteritems())))
 201     web_root.putChild('fee', WebInterface(lambda: worker_fee))
 202     web_root.putChild('current_payouts', WebInterface(lambda: dict((bitcoin_data.script2_to_address(script, net.PARENT), value/1e8) for script, value in get_current_txouts().iteritems())))
 203     web_root.putChild('patron_sendmany', WebInterface(get_patron_sendmany, 'text/plain'))
 204     web_root.putChild('global_stats', WebInterface(get_global_stats))
 205     web_root.putChild('local_stats', WebInterface(get_local_stats))
 206     web_root.putChild('peer_addresses', WebInterface(lambda: ['%s:%i' % (peer.transport.getPeer().host, peer.transport.getPeer().port) for peer in p2p_node.peers.itervalues()]))
 207     web_root.putChild('pings', WebInterface(defer.inlineCallbacks(lambda: defer.returnValue(
 208         dict([(a, (yield b)) for a, b in
 209             [(
 210                 '%s:%i' % (peer.transport.getPeer().host, peer.transport.getPeer().port),
 211                 defer.inlineCallbacks(lambda peer=peer: defer.returnValue(
 212                     min([(yield peer.do_ping().addCallback(lambda x: x/0.001).addErrback(lambda fail: None)) for i in xrange(3)])
 213                 ))()
 214             ) for peer in list(p2p_node.peers.itervalues())]
 215         ])
 216     ))))
 217     web_root.putChild('peer_versions', WebInterface(lambda: dict(('%s:%i' % peer.addr, peer.other_sub_version) for peer in p2p_node.peers.itervalues())))
 218     web_root.putChild('payout_addr', WebInterface(lambda: bitcoin_data.pubkey_hash_to_address(my_pubkey_hash, net.PARENT)))
 219     web_root.putChild('recent_blocks', WebInterface(lambda: [dict(ts=s.timestamp, hash='%064x' % s.header_hash) for s in tracker.get_chain(best_share_var.value, min(tracker.get_height(best_share_var.value), 24*60*60//net.SHARE_PERIOD)) if s.pow_hash <= s.header['bits'].target]))
 220     web_root.putChild('uptime', WebInterface(lambda: time.time() - start_time))
 221     web_root.putChild('stale_rates', WebInterface(lambda: p2pool_data.get_stale_counts(tracker, best_share_var.value, 720, rates=True)))
 222
 223     new_root = resource.Resource()
 224     web_root.putChild('web', new_root)
 225
 226     stat_log = []
 227     if os.path.exists(os.path.join(datadir_path, 'stats')):
 228         try:
 229             with open(os.path.join(datadir_path, 'stats'), 'rb') as f:
 230                 stat_log = json.loads(f.read())
 231         except:
 232             log.err(None, 'Error loading stats:')
 233     def update_stat_log():
 234         while stat_log and stat_log[0]['time'] < time.time() - 24*60*60:
 235             stat_log.pop(0)
 236
 237         lookbehind = 3600//net.SHARE_PERIOD
 238         if tracker.get_height(best_share_var.value) < lookbehind:
 239             return None
 240
 241         global_stale_prop = p2pool_data.get_average_stale_prop(tracker, best_share_var.value, lookbehind)
 242         (stale_orphan_shares, stale_doa_shares), shares, _ = get_stale_counts()
 243         miner_hash_rates, miner_dead_hash_rates = get_local_rates()
 244
 245         stat_log.append(dict(
 246             time=time.time(),
 247             pool_hash_rate=p2pool_data.get_pool_attempts_per_second(tracker, best_share_var.value, lookbehind)/(1-global_stale_prop),
 248             pool_stale_prop=global_stale_prop,
 249             local_hash_rates=miner_hash_rates,
 250             local_dead_hash_rates=miner_dead_hash_rates,
 251             shares=shares,
 252             stale_shares=stale_orphan_shares + stale_doa_shares,
 253             stale_shares_breakdown=dict(orphan=stale_orphan_shares, doa=stale_doa_shares),
 254             current_payout=get_current_txouts().get(bitcoin_data.pubkey_hash_to_script2(my_pubkey_hash), 0)*1e-8,
 255             peers=dict(
 256                 incoming=sum(1 for peer in p2p_node.peers.itervalues() if peer.incoming),
 257                 outgoing=sum(1 for peer in p2p_node.peers.itervalues() if not peer.incoming),
 258             ),
 259             attempts_to_share=bitcoin_data.target_to_average_attempts(tracker.items[best_share_var.value].max_target),
 260             attempts_to_block=bitcoin_data.target_to_average_attempts(bitcoind_work.value['bits'].target),
 261             block_value=bitcoind_work.value['subsidy']*1e-8,
 262         ))
 263
 264         with open(os.path.join(datadir_path, 'stats'), 'wb') as f:
 265             f.write(json.dumps(stat_log))
 266     task.LoopingCall(update_stat_log).start(5*60)
 267     new_root.putChild('log', WebInterface(lambda: stat_log))
 268
 269     def get_share(share_hash_str):
 270         if int(share_hash_str, 16) not in tracker.items:
 271             return None
 272         share = tracker.items[int(share_hash_str, 16)]
 273
 274         return dict(
 275             parent='%064x' % share.previous_hash,
 276             children=['%064x' % x for x in sorted(tracker.reverse.get(share.hash, set()), key=lambda sh: -len(tracker.reverse.get(sh, set())))], # sorted from most children to least children
 277             local=dict(
 278                 verified=share.hash in tracker.verified.items,
 279                 time_first_seen=start_time if share.time_seen == 0 else share.time_seen,
 280                 peer_first_received_from=share.peer.addr if share.peer is not None else None,
 281             ),
 282             share_data=dict(
 283                 timestamp=share.timestamp,
 284                 target=share.target,
 285                 max_target=share.max_target,
 286                 payout_address=bitcoin_data.script2_to_address(share.new_script, net.PARENT),
 287                 donation=share.share_data['donation']/65535,
 288                 stale_info=share.share_data['stale_info'],
 289                 nonce=share.share_data['nonce'],
 290                 desired_version=share.share_data['desired_version'],
 291             ),
 292             block=dict(
 293                 hash='%064x' % share.header_hash,
 294                 header=dict(
 295                     version=share.header['version'],
 296                     previous_block='%064x' % share.header['previous_block'],
 297                     merkle_root='%064x' % share.header['merkle_root'],
 298                     timestamp=share.header['timestamp'],
 299                     target=share.header['bits'].target,
 300                     nonce=share.header['nonce'],
 301                 ),
 302                 gentx=dict(
 303                     hash='%064x' % share.gentx_hash,
 304                     coinbase=share.share_data['coinbase'].ljust(2, '\x00').encode('hex'),
 305                     value=share.share_data['subsidy']*1e-8,
 306                 ),
 307                 txn_count_range=[len(share.other_txs), len(share.other_txs)] if share.other_txs is not None else 1 if len(share.merkle_link['branch']) == 0 else [2**len(share.merkle_link['branch'])//2+1, 2**len(share.merkle_link['branch'])],
 308             ),
 309         )
 310     new_root.putChild('share', WebInterface(lambda share_hash_str: get_share(share_hash_str)))
 311     new_root.putChild('heads', WebInterface(lambda: ['%064x' % x for x in tracker.heads]))
 312     new_root.putChild('verified_heads', WebInterface(lambda: ['%064x' % x for x in tracker.verified.heads]))
 313     new_root.putChild('tails', WebInterface(lambda: ['%064x' % x for t in tracker.tails for x in tracker.reverse.get(t, set())]))
 314     new_root.putChild('verified_tails', WebInterface(lambda: ['%064x' % x for t in tracker.verified.tails for x in tracker.verified.reverse.get(t, set())]))
 315     new_root.putChild('best_share_hash', WebInterface(lambda: '%064x' % best_share_var.value))
 316     def get_share_data(share_hash_str):
 317         if int(share_hash_str, 16) not in tracker.items:
 318             return ''
 319         share = tracker.items[int(share_hash_str, 16)]
 320         return p2pool_data.share_type.pack(share.as_share1a())
 321     new_root.putChild('share_data', WebInterface(lambda share_hash_str: get_share_data(share_hash_str), 'application/octet-stream'))
 322     new_root.putChild('currency_info', WebInterface(lambda: dict(
 323         symbol=net.PARENT.SYMBOL,
 324         block_explorer_url_prefix=net.PARENT.BLOCK_EXPLORER_URL_PREFIX,
 325         address_explorer_url_prefix=net.PARENT.ADDRESS_EXPLORER_URL_PREFIX,
 326     )))
 327     new_root.putChild('version', WebInterface(lambda: p2pool.__version__))
 328
 329     hd_path = os.path.join(datadir_path, 'graph_db')
 330     hd_data = _atomic_read(hd_path)
 331     hd_obj = {}
 332     if hd_data is not None:
 333         try:
 334             hd_obj = json.loads(hd_data)
 335         except Exception:
 336             log.err(None, 'Error reading graph database:')
 337     dataview_descriptions = {
 338         'last_hour': graph.DataViewDescription(150, 60*60),
 339         'last_day': graph.DataViewDescription(300, 60*60*24),
 340         'last_week': graph.DataViewDescription(300, 60*60*24*7),
 341         'last_month': graph.DataViewDescription(300, 60*60*24*30),
 342         'last_year': graph.DataViewDescription(300, 60*60*24*365.25),
 343     }
 344     def build_pool_rates(ds_name, ds_desc, dv_name, dv_desc, obj):
 345         if not obj:
 346             last_bin_end = 0
 347             bins = dv_desc.bin_count*[{}]
 348         else:
 349             pool_rate = obj['pool_rate'][dv_name]
 350             pool_stale_rate = obj['pool_stale_rate'][dv_name]
 351             last_bin_end = max(pool_rate['last_bin_end'], pool_stale_rate['last_bin_end'])
 352             bins = dv_desc.bin_count*[{}]
 353             def get_value(obj, t):
 354                 n = int((obj['last_bin_end'] - t)/dv_desc.bin_width)
 355                 if n < 0 or n >= dv_desc.bin_count:
 356                     return None, 0
 357                 total, count = obj['bins'][n].get('null', [0, 0])
 358                 if count == 0:
 359                     return None, 0
 360                 return total/count, count
 361             def get_bin(t):
 362                 total, total_count = get_value(pool_rate, t)
 363                 bad, bad_count = get_value(pool_stale_rate, t)
 364                 if total is None or bad is None:
 365                     return {}
 366                 count = int((total_count+bad_count)/2+1/2)
 367                 return dict(good=[(total-bad)*count, count], bad=[bad*count, count], null=[0, count])
 368             bins = [get_bin(last_bin_end - (i+1/2)*dv_desc.bin_width) for i in xrange(dv_desc.bin_count)]
 369         return graph.DataView(dv_desc, ds_desc, last_bin_end, bins)
 370     hd = graph.HistoryDatabase.from_obj({
 371         'local_hash_rate': graph.DataStreamDescription(dataview_descriptions, is_gauge=False),
 372         'local_dead_hash_rate': graph.DataStreamDescription(dataview_descriptions, is_gauge=False),
 373         'local_share_hash_rate': graph.DataStreamDescription(dataview_descriptions, is_gauge=False),
 374         'local_dead_share_hash_rate': graph.DataStreamDescription(dataview_descriptions, is_gauge=False),
 375         'pool_rates': graph.DataStreamDescription(dataview_descriptions, multivalues=True,
 376             multivalue_undefined_means_0=True, default_func=build_pool_rates),
 377         'current_payout': graph.DataStreamDescription(dataview_descriptions),
 378         'current_payouts': graph.DataStreamDescription(dataview_descriptions, multivalues=True),
 379         'incoming_peers': graph.DataStreamDescription(dataview_descriptions),
 380         'outgoing_peers': graph.DataStreamDescription(dataview_descriptions),
 381         'miner_hash_rates': graph.DataStreamDescription(dataview_descriptions, is_gauge=False, multivalues=True),
 382         'miner_dead_hash_rates': graph.DataStreamDescription(dataview_descriptions, is_gauge=False, multivalues=True),
 383         'desired_versions': graph.DataStreamDescription(dataview_descriptions, multivalues=True,
 384             multivalue_undefined_means_0=True),
 385         'traffic_rate': graph.DataStreamDescription(dataview_descriptions, is_gauge=False, multivalues=True),
 386     }, hd_obj)
 387     task.LoopingCall(lambda: _atomic_write(hd_path, json.dumps(hd.to_obj()))).start(100)
 388     @pseudoshare_received.watch
 389     def _(work, dead, user):
 390         t = time.time()
 391         hd.datastreams['local_hash_rate'].add_datum(t, work)
 392         if dead:
 393             hd.datastreams['local_dead_hash_rate'].add_datum(t, work)
 394         if user is not None:
 395             hd.datastreams['miner_hash_rates'].add_datum(t, {user: work})
 396             if dead:
 397                 hd.datastreams['miner_dead_hash_rates'].add_datum(t, {user: work})
 398     @share_received.watch
 399     def _(work, dead):
 400         t = time.time()
 401         hd.datastreams['local_share_hash_rate'].add_datum(t, work)
 402         if dead:
 403             hd.datastreams['local_dead_share_hash_rate'].add_datum(t, work)
 404     @traffic_happened.watch
 405     def _(name, bytes):
 406         hd.datastreams['traffic_rate'].add_datum(time.time(), {name: bytes})
 407     def add_point():
 408         if tracker.get_height(best_share_var.value) < 10:
 409             return None
 410         lookbehind = min(tracker.get_height(best_share_var.value), 3600//net.SHARE_PERIOD)
 411         t = time.time()
 412
 413         hd.datastreams['pool_rates'].add_datum(t, p2pool_data.get_stale_counts(tracker, best_share_var.value, lookbehind, rates=True))
 414
 415         current_txouts = get_current_txouts()
 416         hd.datastreams['current_payout'].add_datum(t, current_txouts.get(bitcoin_data.pubkey_hash_to_script2(my_pubkey_hash), 0)*1e-8)
 417         miner_hash_rates, miner_dead_hash_rates = get_local_rates()
 418         current_txouts_by_address = dict((bitcoin_data.script2_to_address(script, net.PARENT), amount) for script, amount in current_txouts.iteritems())
 419         hd.datastreams['current_payouts'].add_datum(t, dict((user, current_txouts_by_address[user]*1e-8) for user in miner_hash_rates if user in current_txouts_by_address))
 420
 421         hd.datastreams['incoming_peers'].add_datum(t, sum(1 for peer in p2p_node.peers.itervalues() if peer.incoming))
 422         hd.datastreams['outgoing_peers'].add_datum(t, sum(1 for peer in p2p_node.peers.itervalues() if not peer.incoming))
 423
 424         vs = p2pool_data.get_desired_version_counts(tracker, best_share_var.value, lookbehind)
 425         vs_total = sum(vs.itervalues())
 426         hd.datastreams['desired_versions'].add_datum(t, dict((str(k), v/vs_total) for k, v in vs.iteritems()))
 427     task.LoopingCall(add_point).start(5)
 428     new_root.putChild('graph_data', WebInterface(lambda source, view: hd.datastreams[source].dataviews[view].get_data(time.time())))
 429
 430     web_root.putChild('static', static.File(os.path.join(os.path.dirname(sys.argv[0]), 'web-static')))
 431
 432     return web_root