fix early takeovers by not-yet activated claims

lbry/wallet/server/block_processor.py

@@ -232,6 +232,10 @@ def __init__(self, env, db: 'LevelDB', daemon, notifications):
         # used to process takeovers due to added activations
         self.pending_activated: DefaultDict[str, DefaultDict[bytes, List[Tuple[PendingActivationKey, int]]]] = \
             defaultdict(lambda: defaultdict(list))
+        # these are used for detecting early takeovers by not yet activated claims/supports
+        self.possible_future_activated_support: DefaultDict[bytes, List[int]] = defaultdict(list)
+        self.possible_future_activated_claim: Dict[Tuple[str, bytes], int] = {}
+        self.possible_future_support_txos: DefaultDict[bytes, List[Tuple[int, int]]] = defaultdict(list)
 
     async def run_in_thread_with_lock(self, func, *args):
         # Run in a thread to prevent blocking.  Shielded so that
@@ -579,6 +583,8 @@ def _expire_claims(self, height: int):
     def _get_pending_claim_amount(self, name: str, claim_hash: bytes, height=None) -> int:
         if (name, claim_hash) in self.staged_activated_claim:
             return self.staged_activated_claim[(name, claim_hash)]
+        if (name, claim_hash) in self.possible_future_activated_claim:
+            return self.possible_future_activated_claim[(name, claim_hash)]
         return self.db._get_active_amount(claim_hash, ACTIVATED_CLAIM_TXO_TYPE, height or (self.height + 1))
 
     def _get_pending_claim_name(self, claim_hash: bytes) -> Optional[str]:
@@ -593,13 +599,15 @@ def _get_pending_supported_amount(self, claim_hash: bytes, height: Optional[int]
         amount = self.db._get_active_amount(claim_hash, ACTIVATED_SUPPORT_TXO_TYPE, height or (self.height + 1)) or 0
         if claim_hash in self.staged_activated_support:
             amount += sum(self.staged_activated_support[claim_hash])
+        if claim_hash in self.possible_future_activated_support:
+            amount += sum(self.possible_future_activated_support[claim_hash])
         if claim_hash in self.removed_active_support:
             return amount - sum(self.removed_active_support[claim_hash])
         return amount
 
     def _get_pending_effective_amount(self, name: str, claim_hash: bytes, height: Optional[int] = None) -> int:
         claim_amount = self._get_pending_claim_amount(name, claim_hash, height=height)
-        support_amount = self._get_pending_supported_amount(claim_hash)
+        support_amount = self._get_pending_supported_amount(claim_hash, height=height)
         return claim_amount + support_amount
 
     def _get_takeover_ops(self, height: int) -> List['RevertableOp']:
@@ -615,6 +623,14 @@ def get_controlling(_name):
                 _controlling = controlling_claims[_name]
             return _controlling
 
+        ops = []
+        names_with_abandoned_controlling_claims: List[str] = []
+
+        # get the claims and supports previously scheduled to be activated at this block
+        activated_at_height = self.db.get_activated_at_height(height)
+        activate_in_future = defaultdict(lambda: defaultdict(list))
+        future_activations = defaultdict(dict)
+
         def get_delayed_activate_ops(name: str, claim_hash: bytes, is_new_claim: bool, tx_num: int, nout: int,
                                      amount: int, is_support: bool) -> List['RevertableOp']:
             controlling = get_controlling(name)
@@ -640,17 +656,20 @@ def get_delayed_activate_ops(name: str, claim_hash: bytes, is_new_claim: bool, t
                         height, ACTIVATED_SUPPORT_TXO_TYPE if is_support else ACTIVATED_CLAIM_TXO_TYPE, tx_num, nout
                     )
                 )
+            else:  # if the delay was higher if still needs to be considered if something else triggers a takeover
+                activate_in_future[name][claim_hash].append((
+                    PendingActivationKey(
+                        height + delay, ACTIVATED_SUPPORT_TXO_TYPE if is_support else ACTIVATED_CLAIM_TXO_TYPE,
+                        tx_num, nout
+                    ), amount
+                ))
+                if is_support:
+                    self.possible_future_support_txos[claim_hash].append((tx_num, nout))
             return StagedActivation(
                 ACTIVATED_SUPPORT_TXO_TYPE if is_support else ACTIVATED_CLAIM_TXO_TYPE, claim_hash, tx_num, nout,
                 height + delay, name, amount
             ).get_activate_ops()
 
-        ops = []
-        names_with_abandoned_controlling_claims: List[str] = []
-
-        # get the claims and supports previously scheduled to be activated at this block
-        activated_at_height = self.db.get_activated_at_height(height)
-
         # determine names needing takeover/deletion due to controlling claims being abandoned
         # and add ops to deactivate abandoned claims
         for claim_hash, staged in self.staged_pending_abandoned.items():
@@ -682,8 +701,9 @@ def get_delayed_activate_ops(name: str, claim_hash: bytes, is_new_claim: bool, t
 
         # prepare to activate or delay activation of the pending claims being added this block
         for (tx_num, nout), staged in self.pending_claims.items():
-            ops.extend(get_delayed_activate_ops(staged.name, staged.claim_hash, not staged.is_update, tx_num, nout,
-                                                staged.amount, is_support=False))
+            ops.extend(get_delayed_activate_ops(
+                staged.name, staged.claim_hash, not staged.is_update, tx_num, nout, staged.amount, is_support=False
+            ))
 
         # and the supports
         for (tx_num, nout), (claim_hash, amount) in self.pending_support_txos.items():
@@ -696,8 +716,9 @@ def get_delayed_activate_ops(name: str, claim_hash: bytes, is_new_claim: bool, t
                 k, v = self.db.get_claim_txo(claim_hash)
                 name = v.name
                 staged_is_new_claim = (v.root_tx_num, v.root_position) == (k.tx_num, k.position)
-            ops.extend(get_delayed_activate_ops(name, claim_hash, staged_is_new_claim, tx_num, nout, amount,
-                                                is_support=True))
+            ops.extend(get_delayed_activate_ops(
+                name, claim_hash, staged_is_new_claim, tx_num, nout, amount, is_support=True
+            ))
 
         # add the activation/delayed-activation ops
         for activated, activated_txos in activated_at_height.items():
@@ -779,15 +800,24 @@ def get_delayed_activate_ops(name: str, claim_hash: bytes, is_new_claim: bool, t
         # claim B is made for 0.2
         # a block later, claim C is made for 0.3, it will schedule to activate 1 (or rarely 2) block(s) after B
         # upon the delayed activation of B, we need to detect to activate C and make it take over early instead
-        future_activations = defaultdict(dict)
         for activated, activated_txos in self.db.get_future_activated(height).items():
             # uses the pending effective amount for the future activation height, not the current height
-            future_effective_amount = self._get_pending_effective_amount(
+            future_amount = self._get_pending_claim_amount(
                 activated.name, activated.claim_hash, activated_txos[-1].height + 1
             )
-            v = future_effective_amount, activated, activated_txos[-1]
+            v = future_amount, activated, activated_txos[-1]
             future_activations[activated.name][activated.claim_hash] = v
 
+        for name, future_activated in activate_in_future.items():
+            for claim_hash, activated in future_activated.items():
+                for txo in activated:
+                    v = txo[1], PendingActivationValue(claim_hash, name), txo[0]
+                    future_activations[name][claim_hash] = v
+                    if v[2].is_claim:
+                        self.possible_future_activated_claim[(name, claim_hash)] = v[0]
+                    else:
+                        self.possible_future_activated_support[claim_hash].append(v[0])
+
         # process takeovers
         checked_names = set()
         for name, activated in self.pending_activated.items():
@@ -807,32 +837,68 @@ def get_delayed_activate_ops(name: str, claim_hash: bytes, is_new_claim: bool, t
                 amounts_with_future_activations = {claim_hash: amount for claim_hash, amount in amounts.items()}
                 amounts_with_future_activations.update(
                     {
-                        claim_hash: effective_amount
-                        for claim_hash, (effective_amount, _, _) in future_activations[name].items()
+                        claim_hash: self._get_pending_effective_amount(
+                            name, claim_hash, self.height + 1 + self.coin.maxTakeoverDelay
+                        ) for claim_hash in future_activations[name]
                     }
                 )
                 winning_including_future_activations = max(
                     amounts_with_future_activations, key=lambda x: amounts_with_future_activations[x]
                 )
+                print(amounts_with_future_activations)
+                print(amounts)
                 if winning_claim_hash != winning_including_future_activations:
                     print(f"\ttakeover of {name} by {winning_claim_hash.hex()} triggered early activation and "
                           f"takeover by {winning_including_future_activations.hex()} at {height}")
-                    _, v, k = future_activations[name][winning_including_future_activations]
-                    amount = self._get_pending_claim_amount(
-                        name, winning_including_future_activations, k.height + 1
-                    )
+                    # handle a pending activated claim jumping the takeover delay when another name takes over
+                    if winning_including_future_activations not in self.pending_claim_txos:
+                        claim = self.db.get_claim_txo(winning_including_future_activations)
+                        tx_num = claim[0].tx_num
+                        position = claim[0].position
+                        amount = claim[1].amount
+                        activation = self.db.get_activation(tx_num, position)
+
+                    else:
+                        tx_num, position = self.pending_claim_txos[winning_including_future_activations]
+                        amount = None
+                        activation = None
+                        for (k, tx_amount) in activate_in_future[name][winning_including_future_activations]:
+                            if (k.tx_num, k.position) == (tx_num, position):
+                                amount = tx_amount
+                                activation = k.height
+                        assert None not in (amount, activation)
                     ops.extend(
                         StagedActivation(
-                            ACTIVATED_CLAIM_TXO_TYPE, winning_including_future_activations, k.tx_num,
-                            k.position, k.height, name, amount
+                            ACTIVATED_CLAIM_TXO_TYPE, winning_including_future_activations, tx_num,
+                            position, activation, name, amount
                         ).get_remove_activate_ops()
                     )
                     ops.extend(
                         StagedActivation(
-                            ACTIVATED_CLAIM_TXO_TYPE, winning_including_future_activations, k.tx_num,
-                            k.position, height, name, amount
+                            ACTIVATED_CLAIM_TXO_TYPE, winning_including_future_activations, tx_num,
+                            position, height, name, amount
                         ).get_activate_ops()
                     )
+
+                    for (k, amount) in activate_in_future[name][winning_including_future_activations]:
+                        txo = (k.tx_num, k.position)
+                        if txo in self.possible_future_support_txos[winning_including_future_activations]:
+                            t = ACTIVATED_SUPPORT_TXO_TYPE
+                        else:
+                            t = ACTIVATED_CLAIM_TXO_TYPE
+                        ops.extend(
+                            StagedActivation(
+                                t, winning_including_future_activations, k.tx_num,
+                                k.position, k.height, name, amount
+                            ).get_remove_activate_ops()
+                        )
+                        ops.extend(
+                            StagedActivation(
+                                t, winning_including_future_activations, k.tx_num,
+                                k.position, height, name, amount
+                            ).get_activate_ops()
+                        )
+
                     ops.extend(get_takeover_name_ops(name, winning_including_future_activations, height, controlling))
                 elif not controlling or (winning_claim_hash != controlling.claim_hash and
                                        name in names_with_abandoned_controlling_claims) or \
@@ -875,9 +941,7 @@ def get_delayed_activate_ops(name: str, claim_hash: bytes, is_new_claim: bool, t
             if name in checked_names:
                 continue
             checked_names.add(name)
-
             controlling = get_controlling(name)
-
             amounts = {
                 claim_hash: self._get_pending_effective_amount(name, claim_hash)
                 for claim_hash in self.db.get_claims_for_name(name) if claim_hash not in self.staged_pending_abandoned
@@ -1012,6 +1076,9 @@ def advance_block(self, block):
         self.staged_activated_support.clear()
         self.staged_activated_claim.clear()
         self.pending_activated.clear()
+        self.possible_future_activated_claim.clear()
+        self.possible_future_activated_support.clear()
+        self.possible_future_support_txos.clear()
 
         for cache in self.search_cache.values():
             cache.clear()

lbry/wallet/server/db/claimtrie.py

@@ -3,6 +3,7 @@
 from lbry.wallet.server.db.revertable import RevertablePut, RevertableDelete, RevertableOp, delete_prefix
 from lbry.wallet.server.db import DB_PREFIXES
 from lbry.wallet.server.db.prefixes import Prefixes, ClaimTakeoverValue
+from lbry.wallet.server.db.prefixes import ACTIVATED_CLAIM_TXO_TYPE
 
 
 def length_encoded_name(name: str) -> bytes:
@@ -51,7 +52,9 @@ class StagedActivation(typing.NamedTuple):
 
     def _get_add_remove_activate_ops(self, add=True):
         op = RevertablePut if add else RevertableDelete
-        print(f"\t{'add' if add else 'remove'} {self.txo_type}, {self.tx_num}, {self.position}, activation={self.activation_height}, {self.name}")
+        print(f"\t{'add' if add else 'remove'} {'claim' if self.txo_type == ACTIVATED_CLAIM_TXO_TYPE else 'support'},"
+              f" {self.tx_num}, {self.position}, activation={self.activation_height}, {self.name}, "
+              f"amount={self.amount}")
         return [
             op(
                 *Prefixes.activated.pack_item(

lbry/wallet/server/leveldb.py

@@ -467,7 +467,7 @@ def get_activated_at_height(self, height: int) -> DefaultDict[PendingActivationV
     def get_future_activated(self, height: int) -> DefaultDict[PendingActivationValue, List[PendingActivationKey]]:
         activated = defaultdict(list)
         for i in range(self.coin.maxTakeoverDelay):
-            prefix = Prefixes.pending_activation.pack_partial_key(height+1+i, ACTIVATED_CLAIM_TXO_TYPE)
+            prefix = Prefixes.pending_activation.pack_partial_key(height+1+i)
             for _k, _v in self.db.iterator(prefix=prefix):
                 k = Prefixes.pending_activation.unpack_key(_k)
                 v = Prefixes.pending_activation.unpack_value(_v)

lbry/wallet/server/session.py

@@ -1054,11 +1054,12 @@ async def claimtrie_getclaimbyid(self, claim_id):
         rows = []
         extra = []
         stream = await self.db.fs_getclaimbyid(claim_id)
+        if not stream:
+            stream = LookupError(f"Could not find claim at {claim_id}")
         rows.append(stream)
         # print("claimtrie resolve %i rows %i extrat" % (len(rows), len(extra)))
         return Outputs.to_base64(rows, extra, 0, None, None)
 
-
     def assert_tx_hash(self, value):
         '''Raise an RPCError if the value is not a valid transaction
         hash.'''