lbry-sdk/lbry/wallet/server/db/claimtrie.py

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import typing
from typing import Optional
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
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nOriginalClaimExpirationTime = 262974
nExtendedClaimExpirationTime = 2102400
nExtendedClaimExpirationForkHeight = 400155
nNormalizedNameForkHeight = 539940 # targeting 21 March 2019
nMinTakeoverWorkaroundHeight = 496850
nMaxTakeoverWorkaroundHeight = 658300 # targeting 30 Oct 2019
nWitnessForkHeight = 680770 # targeting 11 Dec 2019
nAllClaimsInMerkleForkHeight = 658310 # targeting 30 Oct 2019
proportionalDelayFactor = 32
def get_expiration_height(last_updated_height: int) -> int:
if last_updated_height < nExtendedClaimExpirationForkHeight:
return last_updated_height + nOriginalClaimExpirationTime
return last_updated_height + nExtendedClaimExpirationTime
def length_encoded_name(name: str) -> bytes:
encoded = name.encode('utf-8')
return len(encoded).to_bytes(2, byteorder='big') + encoded
class StagedClaimtrieSupport(typing.NamedTuple):
claim_hash: bytes
tx_num: int
position: int
amount: int
def _get_add_remove_support_utxo_ops(self, add=True):
"""
get a list of revertable operations to add or spend a support txo to the key: value database
:param add: if true use RevertablePut operations, otherwise use RevertableDelete
:return:
"""
op = RevertablePut if add else RevertableDelete
return [
op(
*Prefixes.claim_to_support.pack_item(self.claim_hash, self.tx_num, self.position, self.amount)
),
op(
*Prefixes.support_to_claim.pack_item(self.tx_num, self.position, self.claim_hash)
)
]
def get_add_support_utxo_ops(self) -> typing.List[RevertableOp]:
return self._get_add_remove_support_utxo_ops(add=True)
def get_spend_support_txo_ops(self) -> typing.List[RevertableOp]:
return self._get_add_remove_support_utxo_ops(add=False)
def get_update_effective_amount_ops(name: str, new_effective_amount: int, prev_effective_amount: int, tx_num: int,
position: int, root_tx_num: int, root_position: int, claim_hash: bytes,
signing_hash: Optional[bytes] = None,
claims_in_channel_count: Optional[int] = None):
assert root_position != root_tx_num, f"{tx_num} {position} {root_tx_num} {root_tx_num}"
ops = [
RevertableDelete(
*Prefixes.claim_effective_amount.pack_item(
name, prev_effective_amount, tx_num, position, claim_hash, root_tx_num, root_position
)
),
RevertablePut(
*Prefixes.claim_effective_amount.pack_item(
name, new_effective_amount, tx_num, position, claim_hash, root_tx_num, root_position
)
)
]
if signing_hash:
ops.extend([
RevertableDelete(
*Prefixes.channel_to_claim.pack_item(
signing_hash, name, prev_effective_amount, tx_num, position, claim_hash, claims_in_channel_count
)
),
RevertablePut(
*Prefixes.channel_to_claim.pack_item(
signing_hash, name, new_effective_amount, tx_num, position, claim_hash, claims_in_channel_count
)
)
])
return ops
class StagedClaimtrieItem(typing.NamedTuple):
name: str
claim_hash: bytes
amount: int
effective_amount: int
activation_height: int
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expiration_height: int
tx_num: int
position: int
root_claim_tx_num: int
root_claim_tx_position: int
signing_hash: Optional[bytes]
claims_in_channel_count: Optional[int]
@property
def is_update(self) -> bool:
return (self.tx_num, self.position) != (self.root_claim_tx_num, self.root_claim_tx_position)
def _get_add_remove_claim_utxo_ops(self, add=True):
"""
get a list of revertable operations to add or spend a claim txo to the key: value database
:param add: if true use RevertablePut operations, otherwise use RevertableDelete
:return:
"""
op = RevertablePut if add else RevertableDelete
ops = [
# url resolution by effective amount
op(
*Prefixes.claim_effective_amount.pack_item(
self.name, self.effective_amount, self.tx_num, self.position, self.claim_hash,
self.root_claim_tx_num, self.root_claim_tx_position
)
),
# claim tip by claim hash
op(
*Prefixes.claim_to_txo.pack_item(
self.claim_hash, self.tx_num, self.position, self.root_claim_tx_num, self.root_claim_tx_position,
self.amount, self.name
)
),
# short url resolution
op(
*Prefixes.claim_short_id.pack_item(
self.name, self.claim_hash, self.root_claim_tx_num, self.root_claim_tx_position, self.tx_num,
self.position
)
),
# claim hash by txo
op(
*Prefixes.txo_to_claim.pack_item(self.tx_num, self.position, self.claim_hash, self.name)
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),
# claim expiration
op(
*Prefixes.claim_expiration.pack_item(
self.expiration_height, self.tx_num, self.position, self.claim_hash,
self.name
)
)
]
if self.signing_hash and self.claims_in_channel_count is not None:
# claims_in_channel_count can be none if the channel doesnt exist
ops.extend([
# channel by stream
op(
*Prefixes.claim_to_channel.pack_item(self.claim_hash, self.signing_hash)
),
# stream by channel
op(
*Prefixes.channel_to_claim.pack_item(
self.signing_hash, self.name, self.effective_amount, self.tx_num, self.position,
self.claim_hash, self.claims_in_channel_count
)
)
])
return ops
def get_add_claim_utxo_ops(self) -> typing.List[RevertableOp]:
return self._get_add_remove_claim_utxo_ops(add=True)
def get_spend_claim_txo_ops(self) -> typing.List[RevertableOp]:
return self._get_add_remove_claim_utxo_ops(add=False)
def get_invalidate_channel_ops(self, db) -> typing.List[RevertableOp]:
if not self.signing_hash:
return []
return [
RevertableDelete(*Prefixes.claim_to_channel.pack_item(self.claim_hash, self.signing_hash))
] + delete_prefix(db, DB_PREFIXES.channel_to_claim.value + self.signing_hash)
def get_abandon_ops(self, db) -> typing.List[RevertableOp]:
packed_name = length_encoded_name(self.name)
delete_short_id_ops = delete_prefix(
db, DB_PREFIXES.claim_short_id_prefix.value + packed_name + self.claim_hash
)
delete_claim_ops = delete_prefix(db, DB_PREFIXES.claim_to_txo.value + self.claim_hash)
delete_supports_ops = delete_prefix(db, DB_PREFIXES.claim_to_support.value + self.claim_hash)
invalidate_channel_ops = self.get_invalidate_channel_ops(db)
return delete_short_id_ops + delete_claim_ops + delete_supports_ops + invalidate_channel_ops