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lnchannel.available_to_spend: minor refactor

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This commit is contained in:
SomberNight
2020-06-10 20:54:26 +02:00
parent 7fccd4fc5e
commit ccf50dc980
1 changed files with 20 additions and 14 deletions
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34
electrum/lnchannel.py
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@@ -1056,7 +1056,7 @@ class Channel(AbstractChannel):
receiver = subject.inverted()
initiator = LOCAL if self.constraints.is_initiator else REMOTE # the initiator/funder pays on-chain fees
def consider_ctx(*, ctx_owner: HTLCOwner) -> int:
def consider_ctx(*, ctx_owner: HTLCOwner, is_htlc_dust: bool) -> int:
ctn = self.get_next_ctn(ctx_owner)
sender_balance_msat = self.balance_minus_outgoing_htlcs(whose=sender, ctx_owner=ctx_owner, ctn=ctn)
receiver_balance_msat = self.balance_minus_outgoing_htlcs(whose=receiver, ctx_owner=ctx_owner, ctn=ctn)
@@ -1074,21 +1074,27 @@ class Channel(AbstractChannel):
htlc_trim_func = received_htlc_trim_threshold_sat if ctx_owner == receiver else offered_htlc_trim_threshold_sat
htlc_trim_threshold_msat = htlc_trim_func(dust_limit_sat=self.config[ctx_owner].dust_limit_sat, feerate=feerate) * 1000
max_send_msat = sender_balance_msat - sender_reserve_msat - ctx_fees_msat[sender]
if max_send_msat < htlc_trim_threshold_msat:
# there will be no corresponding HTLC output
return max_send_msat
if sender == initiator:
max_send_after_htlc_fee_msat = max_send_msat - htlc_fee_msat
max_send_msat = max(htlc_trim_threshold_msat - 1, max_send_after_htlc_fee_msat)
return max_send_msat
if is_htlc_dust:
return min(max_send_msat, htlc_trim_threshold_msat - 1)
else:
# the receiver is the initiator, so they need to be able to pay tx fees
if receiver_balance_msat - receiver_reserve_msat - ctx_fees_msat[receiver] - htlc_fee_msat < 0:
max_send_msat = htlc_trim_threshold_msat - 1
return max_send_msat
if sender == initiator:
return max_send_msat - htlc_fee_msat
else:
# the receiver is the initiator, so they need to be able to pay tx fees
if receiver_balance_msat - receiver_reserve_msat - ctx_fees_msat[receiver] - htlc_fee_msat < 0:
return 0
return max_send_msat
max_send_msat = min(consider_ctx(ctx_owner=receiver),
consider_ctx(ctx_owner=sender))
max_send_msat = min(
max(
consider_ctx(ctx_owner=receiver, is_htlc_dust=True),
consider_ctx(ctx_owner=receiver, is_htlc_dust=False),
),
max(
consider_ctx(ctx_owner=sender, is_htlc_dust=True),
consider_ctx(ctx_owner=sender, is_htlc_dust=False),
),
)
max_send_msat = max(max_send_msat, 0)
return max_send_msat