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lnhtlc: remove unnecessary double application of pending feerate

regtest_lnd
Janus 7 years ago
committed by SomberNight
parent
6256ccabd6
commit
a43fc875db
No known key found for this signature in database GPG Key ID: B33B5F232C6271E9
1 changed files with 46 additions and 48 deletions
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  1. 94
      lib/lnhtlc.py

94
lib/lnhtlc.py
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@ -188,33 +188,32 @@ class HTLCStateMachine(PrintError):
self.pending_ack_fee_update = self.pending_fee_update
self.pending_fee_update = None
with PendingFeerateApplied(self):
sig_64 = sign_and_get_sig_string(self.pending_remote_commitment, self.local_config, self.remote_config)
their_remote_htlc_privkey_number = derive_privkey(
int.from_bytes(self.local_config.htlc_basepoint.privkey, 'big'),
self.remote_state.next_per_commitment_point)
their_remote_htlc_privkey = their_remote_htlc_privkey_number.to_bytes(32, 'big')
for_us = False
htlcsigs = []
for we_receive, htlcs in zip([True, False], [self.htlcs_in_remote, self.htlcs_in_local]):
assert len(htlcs) <= 1
for htlc in htlcs:
weight = HTLC_SUCCESS_WEIGHT if we_receive else HTLC_TIMEOUT_WEIGHT
fee = self.remote_state.feerate // 1000 * weight
if htlc.amount_msat // 1000 < self.remote_config.dust_limit_sat + fee:
print("value too small, skipping. htlc amt: {}, weight: {}, remote feerate {}, remote dust limit {}".format( htlc.amount_msat, weight, self.remote_state.feerate, self.remote_config.dust_limit_sat))
continue
original_htlc_output_index = 0
args = [self.remote_state.next_per_commitment_point, for_us, we_receive, htlc.amount_msat + htlc.total_fee, htlc.cltv_expiry, htlc.payment_hash, self.pending_remote_commitment, original_htlc_output_index]
htlc_tx = make_htlc_tx_with_open_channel(self, *args)
sig = bfh(htlc_tx.sign_txin(0, their_remote_htlc_privkey))
htlc_sig = ecc.sig_string_from_der_sig(sig[:-1])
htlcsigs.append(htlc_sig)
return sig_64, htlcsigs
sig_64 = sign_and_get_sig_string(self.pending_remote_commitment, self.local_config, self.remote_config)
their_remote_htlc_privkey_number = derive_privkey(
int.from_bytes(self.local_config.htlc_basepoint.privkey, 'big'),
self.remote_state.next_per_commitment_point)
their_remote_htlc_privkey = their_remote_htlc_privkey_number.to_bytes(32, 'big')
for_us = False
htlcsigs = []
for we_receive, htlcs in zip([True, False], [self.htlcs_in_remote, self.htlcs_in_local]):
assert len(htlcs) <= 1
for htlc in htlcs:
weight = HTLC_SUCCESS_WEIGHT if we_receive else HTLC_TIMEOUT_WEIGHT
fee = self.remote_state.feerate // 1000 * weight
if htlc.amount_msat // 1000 < self.remote_config.dust_limit_sat + fee:
print("value too small, skipping. htlc amt: {}, weight: {}, remote feerate {}, remote dust limit {}".format( htlc.amount_msat, weight, self.remote_state.feerate, self.remote_config.dust_limit_sat))
continue
original_htlc_output_index = 0
args = [self.remote_state.next_per_commitment_point, for_us, we_receive, htlc.amount_msat + htlc.total_fee, htlc.cltv_expiry, htlc.payment_hash, self.pending_remote_commitment, original_htlc_output_index]
htlc_tx = make_htlc_tx_with_open_channel(self, *args)
sig = bfh(htlc_tx.sign_txin(0, their_remote_htlc_privkey))
htlc_sig = ecc.sig_string_from_der_sig(sig[:-1])
htlcsigs.append(htlc_sig)
return sig_64, htlcsigs
def receive_new_commitment(self, sig, htlc_sigs):
"""
@ -238,27 +237,26 @@ class HTLCStateMachine(PrintError):
self.pending_ack_fee_update = self.pending_fee_update
self.pending_fee_update = None
with PendingFeerateApplied(self):
preimage_hex = self.pending_local_commitment.serialize_preimage(0)
pre_hash = Hash(bfh(preimage_hex))
if not ecc.verify_signature(self.remote_config.multisig_key.pubkey, sig, pre_hash):
raise Exception('failed verifying signature of our updated commitment transaction: ' + str(sig))
_, this_point, _ = self.points
if len(self.htlcs_in_remote) > 0 and len(self.pending_local_commitment.outputs()) == 3:
print("CHECKING HTLC SIGS")
we_receive = True
payment_hash = self.htlcs_in_remote[0].payment_hash
amount_msat = self.htlcs_in_remote[0].amount_msat
cltv_expiry = self.htlcs_in_remote[0].cltv_expiry
htlc_tx = make_htlc_tx_with_open_channel(self, this_point, True, we_receive, amount_msat, cltv_expiry, payment_hash, self.pending_local_commitment, 0)
pre_hash = Hash(bfh(htlc_tx.serialize_preimage(0)))
remote_htlc_pubkey = derive_pubkey(self.remote_config.htlc_basepoint.pubkey, this_point)
if not ecc.verify_signature(remote_htlc_pubkey, htlc_sigs[0], pre_hash):
raise Exception("failed verifying signature an HTLC tx spending from one of our commit tx'es HTLC outputs")
# TODO check htlc in htlcs_in_local
preimage_hex = self.pending_local_commitment.serialize_preimage(0)
pre_hash = Hash(bfh(preimage_hex))
if not ecc.verify_signature(self.remote_config.multisig_key.pubkey, sig, pre_hash):
raise Exception('failed verifying signature of our updated commitment transaction: ' + str(sig))
_, this_point, _ = self.points
if len(self.htlcs_in_remote) > 0 and len(self.pending_local_commitment.outputs()) == 3:
print("CHECKING HTLC SIGS")
we_receive = True
payment_hash = self.htlcs_in_remote[0].payment_hash
amount_msat = self.htlcs_in_remote[0].amount_msat
cltv_expiry = self.htlcs_in_remote[0].cltv_expiry
htlc_tx = make_htlc_tx_with_open_channel(self, this_point, True, we_receive, amount_msat, cltv_expiry, payment_hash, self.pending_local_commitment, 0)
pre_hash = Hash(bfh(htlc_tx.serialize_preimage(0)))
remote_htlc_pubkey = derive_pubkey(self.remote_config.htlc_basepoint.pubkey, this_point)
if not ecc.verify_signature(remote_htlc_pubkey, htlc_sigs[0], pre_hash):
raise Exception("failed verifying signature an HTLC tx spending from one of our commit tx'es HTLC outputs")
# TODO check htlc in htlcs_in_local
def revoke_current_commitment(self):
"""

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