forked from LBRYCommunity/lbry-sdk
fix takeover edge case
if a claim with a higher value than that of a claim taking over a name exists but isn't yet activated, activate it early and have it take over the name
This commit is contained in:
Jack Robison
Victor Shyba
parent
b6e4cb9102
commit
d69180da71
4 changed files with 160 additions and 95 deletions
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@ -206,6 +206,10 @@ class BlockProcessor:
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self.history_cache = {}
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self.status_server = StatusServer()
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#################################
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# attributes used for calculating stake activations and takeovers per block
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#################################
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# txo to pending claim
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self.pending_claims: typing.Dict[Tuple[int, int], StagedClaimtrieItem] = {}
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# claim hash to pending claim txo
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@ -572,10 +576,10 @@ class BlockProcessor:
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ops.extend(self._abandon(spent_claims))
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return ops
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def _get_pending_claim_amount(self, name: str, claim_hash: bytes) -> int:
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def _get_pending_claim_amount(self, name: str, claim_hash: bytes, height=None) -> int:
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if (name, claim_hash) in self.staged_activated_claim:
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return self.staged_activated_claim[(name, claim_hash)]
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return self.db._get_active_amount(claim_hash, ACTIVATED_CLAIM_TXO_TYPE, self.height + 1)
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return self.db._get_active_amount(claim_hash, ACTIVATED_CLAIM_TXO_TYPE, height or (self.height + 1))
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def _get_pending_claim_name(self, claim_hash: bytes) -> Optional[str]:
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assert claim_hash is not None
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@ -585,16 +589,16 @@ class BlockProcessor:
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if claim_info:
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return claim_info[1].name
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def _get_pending_supported_amount(self, claim_hash: bytes) -> int:
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amount = self.db._get_active_amount(claim_hash, ACTIVATED_SUPPORT_TXO_TYPE, self.height + 1) or 0
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def _get_pending_supported_amount(self, claim_hash: bytes, height: Optional[int] = None) -> int:
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amount = self.db._get_active_amount(claim_hash, ACTIVATED_SUPPORT_TXO_TYPE, height or (self.height + 1)) or 0
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if claim_hash in self.staged_activated_support:
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amount += sum(self.staged_activated_support[claim_hash])
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if claim_hash in self.removed_active_support:
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return amount - sum(self.removed_active_support[claim_hash])
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return amount
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def _get_pending_effective_amount(self, name: str, claim_hash: bytes) -> int:
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claim_amount = self._get_pending_claim_amount(name, claim_hash)
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def _get_pending_effective_amount(self, name: str, claim_hash: bytes, height: Optional[int] = None) -> int:
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claim_amount = self._get_pending_claim_amount(name, claim_hash, height=height)
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support_amount = self._get_pending_supported_amount(claim_hash)
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return claim_amount + support_amount
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@ -611,6 +615,36 @@ class BlockProcessor:
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_controlling = controlling_claims[_name]
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return _controlling
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def get_delayed_activate_ops(name: str, claim_hash: bytes, is_new_claim: bool, tx_num: int, nout: int,
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amount: int, is_support: bool) -> List['RevertableOp']:
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controlling = get_controlling(name)
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nothing_is_controlling = not controlling
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staged_is_controlling = False if not controlling else claim_hash == controlling.claim_hash
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controlling_is_abandoned = False if not controlling else \
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controlling.claim_hash in names_with_abandoned_controlling_claims
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if nothing_is_controlling or staged_is_controlling or controlling_is_abandoned:
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delay = 0
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elif is_new_claim:
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delay = self.coin.get_delay_for_name(height - controlling.height)
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else:
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controlling_effective_amount = self._get_pending_effective_amount(name, controlling.claim_hash)
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staged_effective_amount = self._get_pending_effective_amount(name, claim_hash)
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staged_update_could_cause_takeover = staged_effective_amount > controlling_effective_amount
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delay = 0 if not staged_update_could_cause_takeover else self.coin.get_delay_for_name(
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height - controlling.height
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)
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if delay == 0: # if delay was 0 it needs to be considered for takeovers
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activated_at_height[PendingActivationValue(claim_hash, name)].append(
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PendingActivationKey(
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height, ACTIVATED_SUPPORT_TXO_TYPE if is_support else ACTIVATED_CLAIM_TXO_TYPE, tx_num, nout
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)
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)
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return StagedActivation(
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ACTIVATED_SUPPORT_TXO_TYPE if is_support else ACTIVATED_CLAIM_TXO_TYPE, claim_hash, tx_num, nout,
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height + delay, name, amount
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).get_activate_ops()
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ops = []
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names_with_abandoned_controlling_claims: List[str] = []
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@ -648,28 +682,8 @@ class BlockProcessor:
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# prepare to activate or delay activation of the pending claims being added this block
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for (tx_num, nout), staged in self.pending_claims.items():
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controlling = get_controlling(staged.name)
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delay = 0
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if not controlling or staged.claim_hash == controlling.claim_hash or \
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controlling.claim_hash in names_with_abandoned_controlling_claims:
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pass
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else:
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controlling_effective_amount = self._get_pending_effective_amount(staged.name, controlling.claim_hash)
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amount = self._get_pending_effective_amount(staged.name, staged.claim_hash)
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delay = 0
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# if this is an OP_CLAIM or the amount appears to trigger a takeover, delay
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if not staged.is_update or (amount > controlling_effective_amount):
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delay = self.coin.get_delay_for_name(height - controlling.height)
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ops.extend(
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StagedActivation(
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ACTIVATED_CLAIM_TXO_TYPE, staged.claim_hash, staged.tx_num, staged.position,
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height + delay, staged.name, staged.amount
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).get_activate_ops()
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)
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if delay == 0: # if delay was 0 it needs to be considered for takeovers
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activated_at_height[PendingActivationValue(staged.claim_hash, staged.name)].append(
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PendingActivationKey(height, ACTIVATED_CLAIM_TXO_TYPE, tx_num, nout)
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)
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ops.extend(get_delayed_activate_ops(staged.name, staged.claim_hash, not staged.is_update, tx_num, nout,
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staged.amount, is_support=False))
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# and the supports
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for (tx_num, nout), (claim_hash, amount) in self.pending_support_txos.items():
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@ -677,29 +691,13 @@ class BlockProcessor:
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continue
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elif claim_hash in self.pending_claim_txos:
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name = self.pending_claims[self.pending_claim_txos[claim_hash]].name
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is_update = self.pending_claims[self.pending_claim_txos[claim_hash]].is_update
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staged_is_new_claim = not self.pending_claims[self.pending_claim_txos[claim_hash]].is_update
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else:
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k, v = self.db.get_claim_txo(claim_hash)
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name = v.name
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is_update = (v.root_tx_num, v.root_position) != (k.tx_num, k.position)
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controlling = get_controlling(name)
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delay = 0
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if not controlling or claim_hash == controlling.claim_hash:
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pass
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elif not is_update or self._get_pending_effective_amount(staged.name,
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claim_hash) > self._get_pending_effective_amount(staged.name, controlling.claim_hash):
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delay = self.coin.get_delay_for_name(height - controlling.height)
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if delay == 0:
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activated_at_height[PendingActivationValue(claim_hash, name)].append(
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PendingActivationKey(height + delay, ACTIVATED_SUPPORT_TXO_TYPE, tx_num, nout)
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)
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ops.extend(
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StagedActivation(
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ACTIVATED_SUPPORT_TXO_TYPE, claim_hash, tx_num, nout,
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height + delay, name, amount
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).get_activate_ops()
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)
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staged_is_new_claim = (v.root_tx_num, v.root_position) == (k.tx_num, k.position)
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ops.extend(get_delayed_activate_ops(name, claim_hash, staged_is_new_claim, tx_num, nout, amount,
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is_support=True))
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# add the activation/delayed-activation ops
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for activated, activated_txos in activated_at_height.items():
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@ -774,30 +772,79 @@ class BlockProcessor:
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controlling = get_controlling(need_takeover)
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ops.extend(get_remove_name_ops(need_takeover, controlling.claim_hash, controlling.height))
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# process takeovers from the combined newly added and previously scheduled claims
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# scan for possible takeovers out of the accumulated activations, of these make sure there
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# aren't any future activations for the taken over names with yet higher amounts, if there are
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# these need to get activated now and take over instead. for example:
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# claim A is winning for 0.1 for long enough for a > 1 takeover delay
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# claim B is made for 0.2
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# a block later, claim C is made for 0.3, it will schedule to activate 1 (or rarely 2) block(s) after B
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# upon the delayed activation of B, we need to detect to activate C and make it take over early instead
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future_activations = defaultdict(dict)
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for activated, activated_txos in self.db.get_future_activated(height).items():
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# uses the pending effective amount for the future activation height, not the current height
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future_effective_amount = self._get_pending_effective_amount(
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activated.name, activated.claim_hash, activated_txos[-1].height + 1
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)
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v = future_effective_amount, activated, activated_txos[-1]
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future_activations[activated.name][activated.claim_hash] = v
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# process takeovers
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checked_names = set()
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for name, activated in self.pending_activated.items():
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checked_names.add(name)
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if name in names_with_abandoned_controlling_claims:
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print(f'\tabandoned {name} need takeover')
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controlling = controlling_claims[name]
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amounts = {
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claim_hash: self._get_pending_effective_amount(name, claim_hash)
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for claim_hash in activated.keys() if claim_hash not in self.staged_pending_abandoned
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}
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# if there is a controlling claim include it in the amounts to ensure it remains the max
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if controlling and controlling.claim_hash not in self.staged_pending_abandoned:
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amounts[controlling.claim_hash] = self._get_pending_effective_amount(name, controlling.claim_hash)
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winning = max(amounts, key=lambda x: amounts[x])
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if not controlling or (winning != controlling.claim_hash and
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winning_claim_hash = max(amounts, key=lambda x: amounts[x])
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if not controlling or (winning_claim_hash != controlling.claim_hash and
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name in names_with_abandoned_controlling_claims) or \
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((winning != controlling.claim_hash) and (amounts[winning] > amounts[controlling.claim_hash])):
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if (name, winning) in need_reactivate_if_takes_over:
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previous_pending_activate = need_reactivate_if_takes_over[(name, winning)]
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amount = self.db.get_claim_txo_amount(
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winning, previous_pending_activate.tx_num, previous_pending_activate.position
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((winning_claim_hash != controlling.claim_hash) and (amounts[winning_claim_hash] > amounts[controlling.claim_hash])):
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amounts_with_future_activations = {claim_hash: amount for claim_hash, amount in amounts.items()}
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amounts_with_future_activations.update(
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{
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claim_hash: effective_amount
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for claim_hash, (effective_amount, _, _) in future_activations[name].items()
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}
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)
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if winning in self.pending_claim_txos:
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tx_num, position = self.pending_claim_txos[winning]
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winning_including_future_activations = max(
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amounts_with_future_activations, key=lambda x: amounts_with_future_activations[x]
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)
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if winning_claim_hash != winning_including_future_activations:
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print(f"\ttakeover of {name} by {winning_claim_hash.hex()} triggered early activation and "
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f"takeover by {winning_including_future_activations.hex()} at {height}")
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_, v, k = future_activations[name][winning_including_future_activations]
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amount = self._get_pending_claim_amount(
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name, winning_including_future_activations, k.height + 1
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)
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ops.extend(
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StagedActivation(
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ACTIVATED_CLAIM_TXO_TYPE, winning_including_future_activations, k.tx_num,
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k.position, k.height, name, amount
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).get_remove_activate_ops()
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)
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ops.extend(
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StagedActivation(
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ACTIVATED_CLAIM_TXO_TYPE, winning_including_future_activations, k.tx_num,
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k.position, height, name, amount
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).get_activate_ops()
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)
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ops.extend(get_takeover_name_ops(name, winning_including_future_activations, height))
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elif not controlling or (winning_claim_hash != controlling.claim_hash and
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name in names_with_abandoned_controlling_claims) or \
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((winning_claim_hash != controlling.claim_hash) and (amounts[winning_claim_hash] > amounts[controlling.claim_hash])):
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print(f"\ttakeover {name} by {winning_claim_hash.hex()} at {height}")
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if (name, winning_claim_hash) in need_reactivate_if_takes_over:
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previous_pending_activate = need_reactivate_if_takes_over[(name, winning_claim_hash)]
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amount = self.db.get_claim_txo_amount(
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winning_claim_hash, previous_pending_activate.tx_num, previous_pending_activate.position
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)
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if winning_claim_hash in self.pending_claim_txos:
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tx_num, position = self.pending_claim_txos[winning_claim_hash]
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amount = self.pending_claims[(tx_num, position)].amount
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else:
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tx_num, position = previous_pending_activate.tx_num, previous_pending_activate.position
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@ -805,21 +852,18 @@ class BlockProcessor:
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# the claim had a pending activation in the future, move it to now
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ops.extend(
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StagedActivation(
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ACTIVATED_CLAIM_TXO_TYPE, winning, tx_num,
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ACTIVATED_CLAIM_TXO_TYPE, winning_claim_hash, tx_num,
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position, previous_pending_activate.height, name, amount
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).get_remove_activate_ops()
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)
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ops.extend(
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StagedActivation(
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ACTIVATED_CLAIM_TXO_TYPE, winning, tx_num,
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ACTIVATED_CLAIM_TXO_TYPE, winning_claim_hash, tx_num,
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position, height, name, amount
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).get_activate_ops()
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)
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ops.extend(get_takeover_name_ops(name, winning, height))
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else:
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ops.extend(get_takeover_name_ops(name, winning, height))
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elif winning == controlling.claim_hash:
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ops.extend(get_takeover_name_ops(name, winning_claim_hash, height))
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elif winning_claim_hash == controlling.claim_hash:
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print("\tstill winning")
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pass
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else:
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@ -871,9 +915,6 @@ class BlockProcessor:
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append_hashX_by_tx = hashXs_by_tx.append
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hashX_from_script = self.coin.hashX_from_script
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zero_delay_claims: typing.Dict[Tuple[str, bytes], Tuple[int, int]] = {}
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abandoned_or_expired_controlling = set()
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for tx, tx_hash in txs:
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spent_claims = {}
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@ -5,11 +5,6 @@ from lbry.wallet.server.db import DB_PREFIXES
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from lbry.wallet.server.db.prefixes import Prefixes, ClaimTakeoverValue
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def length_encoded_name(name: str) -> bytes:
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encoded = name.encode('utf-8')
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return len(encoded).to_bytes(2, byteorder='big') + encoded
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@ -96,7 +91,6 @@ def get_remove_name_ops(name: str, claim_hash: bytes, height: int) -> typing.Lis
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def get_takeover_name_ops(name: str, claim_hash: bytes, takeover_height: int,
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previous_winning: Optional[ClaimTakeoverValue] = None):
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if previous_winning:
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# print(f"takeover previously owned {name} - {claim_hash.hex()} at {takeover_height}")
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return [
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RevertableDelete(
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*Prefixes.claim_takeover.pack_item(
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@ -109,7 +103,6 @@ def get_takeover_name_ops(name: str, claim_hash: bytes, takeover_height: int,
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)
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)
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]
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# print(f"takeover {name} - {claim_hash[::-1].hex()} at {takeover_height}")
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return [
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RevertablePut(
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*Prefixes.claim_takeover.pack_item(
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@ -464,6 +464,16 @@ class LevelDB:
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activated[v].append(k)
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return activated
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def get_future_activated(self, height: int) -> DefaultDict[PendingActivationValue, List[PendingActivationKey]]:
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activated = defaultdict(list)
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for i in range(self.coin.maxTakeoverDelay):
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prefix = Prefixes.pending_activation.pack_partial_key(height+1+i, ACTIVATED_CLAIM_TXO_TYPE)
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for _k, _v in self.db.iterator(prefix=prefix):
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k = Prefixes.pending_activation.unpack_key(_k)
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v = Prefixes.pending_activation.unpack_value(_v)
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activated[v].append(k)
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return activated
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async def _read_tx_counts(self):
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if self.tx_counts is not None:
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return
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@ -434,6 +434,27 @@ class ResolveClaimTakeovers(BaseResolveTestCase):
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await self.assertNoClaimForName(name)
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await self._test_activation_delay()
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async def test_early_takeover(self):
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name = 'derp'
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# block 207
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first_claim_id = (await self.stream_create(name, '0.1', allow_duplicate_name=True))['outputs'][0]['claim_id']
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await self.assertMatchClaimIsWinning(name, first_claim_id)
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await self.generate(96)
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# block 304, activates at 307
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second_claim_id = (await self.stream_create(name, '0.2', allow_duplicate_name=True))['outputs'][0]['claim_id']
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# block 305, activates at 308 (but gets triggered early by the takeover by the second claim)
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third_claim_id = (await self.stream_create(name, '0.3', allow_duplicate_name=True))['outputs'][0]['claim_id']
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self.assertNotEqual(first_claim_id, second_claim_id)
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# takeover should not have happened yet
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await self.assertMatchClaimIsWinning(name, first_claim_id)
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await self.generate(1)
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await self.assertMatchClaimIsWinning(name, first_claim_id)
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await self.generate(1)
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await self.assertMatchClaimIsWinning(name, third_claim_id)
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await self.generate(1)
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await self.assertMatchClaimIsWinning(name, third_claim_id)
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async def test_block_takeover_with_delay_1_support(self):
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name = 'derp'
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# initially claim the name
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