commit 540dd73f3ba9d5109984c218ff7aa87154a765d7
parent ee59ad13c44674e37250948e169e502babbb002f
Author: ThomasV <thomasv@electrum.org>
Date: Tue, 9 Jun 2020 13:41:44 +0200
Submarine swaps:
- improve gui
- allow coin selection
- allow spending 'max'
Diffstat:
2 files changed, 65 insertions(+), 21 deletions(-)
diff --git a/electrum/gui/qt/swap_dialog.py b/electrum/gui/qt/swap_dialog.py
@@ -9,7 +9,9 @@ from electrum.i18n import _
from electrum.lnchannel import AbstractChannel, PeerState
from electrum.wallet import Abstract_Wallet
from electrum.lnutil import LOCAL, REMOTE, format_short_channel_id, LN_MAX_FUNDING_SAT
+from electrum.lnutil import ln_dummy_address
from electrum.lnworker import LNWallet
+from electrum.transaction import PartialTxOutput
from .util import (MyTreeView, WindowModalDialog, Buttons, OkButton, CancelButton,
EnterButton, WaitingDialog, MONOSPACE_FONT, ColorScheme)
@@ -39,6 +41,7 @@ class SwapDialog(WindowModalDialog):
vbox = QVBoxLayout(self)
vbox.addWidget(WWLabel('Swap lightning funds for on-chain funds if you need to increase your receiving capacity. This service is powered by the Boltz backend.'))
self.send_amount_e = BTCAmountEdit(self.window.get_decimal_point)
+ self.send_amount_e.shortcut.connect(self.spend_max)
self.recv_amount_e = BTCAmountEdit(self.window.get_decimal_point)
self.send_button = QPushButton('')
self.recv_button = QPushButton('')
@@ -54,17 +57,17 @@ class SwapDialog(WindowModalDialog):
fee_combo = FeeComboBox(fee_slider)
fee_slider.update()
self.fee_label = QLabel()
- self.percentage_label = QLabel()
+ self.server_fee_label = QLabel()
h = QGridLayout()
- h.addWidget(QLabel(_('You send')+':'), 2, 0)
- h.addWidget(self.send_amount_e, 2, 1)
- h.addWidget(self.send_button, 2, 2)
- h.addWidget(QLabel(_('You receive')+':'), 3, 0)
- h.addWidget(self.recv_amount_e, 3, 1)
- h.addWidget(self.recv_button, 3, 2)
- h.addWidget(QLabel(_('Swap fee')+':'), 4, 0)
- h.addWidget(self.percentage_label, 4, 1)
- h.addWidget(QLabel(_('Mining fees')+':'), 5, 0)
+ h.addWidget(QLabel(_('You send')+':'), 1, 0)
+ h.addWidget(self.send_amount_e, 1, 1)
+ h.addWidget(self.send_button, 1, 2)
+ h.addWidget(QLabel(_('You receive')+':'), 2, 0)
+ h.addWidget(self.recv_amount_e, 2, 1)
+ h.addWidget(self.recv_button, 2, 2)
+ h.addWidget(QLabel(_('Server fee')+':'), 4, 0)
+ h.addWidget(self.server_fee_label, 4, 1)
+ h.addWidget(QLabel(_('Mining fee')+':'), 5, 0)
h.addWidget(self.fee_label, 5, 1)
h.addWidget(fee_slider, 6, 1)
h.addWidget(fee_combo, 6, 2)
@@ -95,6 +98,13 @@ class SwapDialog(WindowModalDialog):
self.recv_amount_e.setAmount(None)
self.update()
+ def spend_max(self):
+ if not self.is_reverse:
+ self.update_tx('!')
+ if self.tx:
+ txo = self.tx.outputs()[0]
+ self.send_amount_e.setAmount(txo.value)
+
def on_send_edited(self):
if self.send_amount_e.follows:
return
@@ -108,6 +118,7 @@ class SwapDialog(WindowModalDialog):
self.recv_amount_e.setStyleSheet(ColorScheme.BLUE.as_stylesheet())
self.recv_amount_e.follows = False
self.send_follows = False
+ self.update_fee()
def on_recv_edited(self):
if self.recv_amount_e.follows:
@@ -122,14 +133,27 @@ class SwapDialog(WindowModalDialog):
self.send_amount_e.setStyleSheet(ColorScheme.BLUE.as_stylesheet())
self.send_amount_e.follows = False
self.send_follows = True
+ self.update_fee()
def update(self):
sm = self.swap_manager
self.send_button.setIcon(read_QIcon("lightning.png" if self.is_reverse else "bitcoin.png"))
self.recv_button.setIcon(read_QIcon("lightning.png" if not self.is_reverse else "bitcoin.png"))
- fee = sm.lockup_fee + sm.get_claim_fee() if self.is_reverse else sm.normal_fee
- self.fee_label.setText(self.window.format_amount(fee) + ' ' + self.window.base_unit())
- self.percentage_label.setText('%.2f'%sm.percentage + '%')
+ server_mining_fee = sm.lockup_fee if self.is_reverse else sm.normal_fee
+ server_fee_str = '%.2f'%sm.percentage + '% + ' + self.window.format_amount(server_mining_fee) + ' ' + self.window.base_unit()
+ self.server_fee_label.setText(server_fee_str)
+ self.update_fee()
+
+ def update_fee(self):
+ if self.is_reverse:
+ sm = self.swap_manager
+ fee = sm.get_claim_fee()
+ else:
+ onchain_amount = self.send_amount_e.get_amount()
+ self.update_tx(onchain_amount)
+ fee = self.tx.get_fee() if self.tx else None
+ fee_text = self.window.format_amount(fee) + ' ' + self.window.base_unit() if fee else ''
+ self.fee_label.setText(fee_text)
def run(self):
self.window.run_coroutine_from_thread(self.swap_manager.get_pairs(), lambda x: self.update())
@@ -152,6 +176,16 @@ class SwapDialog(WindowModalDialog):
return
self.window.protect(self.do_normal_swap, (lightning_amount, onchain_amount))
+ def update_tx(self, onchain_amount):
+ if onchain_amount is None:
+ self.tx = None
+ return
+ outputs = [PartialTxOutput.from_address_and_value(ln_dummy_address(), onchain_amount)]
+ coins = self.window.get_coins()
+ self.tx = self.window.wallet.make_unsigned_transaction(
+ coins=coins,
+ outputs=outputs)
+
def do_normal_swap(self, lightning_amount, onchain_amount, password):
- coro = self.swap_manager.normal_swap(lightning_amount, onchain_amount, password)
+ coro = self.swap_manager.normal_swap(lightning_amount, onchain_amount, password, tx=self.tx)
self.window.run_coroutine_from_thread(coro)
diff --git a/electrum/submarine_swaps.py b/electrum/submarine_swaps.py
@@ -10,7 +10,7 @@ from .bitcoin import address_to_script, script_to_p2wsh, redeem_script_to_addres
from .transaction import TxOutpoint, PartialTxInput, PartialTxOutput, PartialTransaction, construct_witness
from .transaction import script_GetOp, match_script_against_template, OPPushDataGeneric, OPPushDataPubkey
from .util import log_exceptions
-from .lnutil import REDEEM_AFTER_DOUBLE_SPENT_DELAY
+from .lnutil import REDEEM_AFTER_DOUBLE_SPENT_DELAY, ln_dummy_address
from .bitcoin import dust_threshold
from .logging import Logger
from .lnutil import hex_to_bytes
@@ -143,7 +143,10 @@ class SwapManager(Logger):
tx = create_claim_tx(txin, swap.redeem_script, preimage, swap.privkey, address, amount_sat, swap.locktime)
await self.network.broadcast_transaction(tx)
# save txid
- swap.spending_txid = tx.txid()
+ if swap.is_reverse:
+ swap.spending_txid = tx.txid()
+ else:
+ self.wallet.setlabel(tx.txid(), 'Swap refund')
def get_claim_fee(self):
return self.lnwatcher.config.estimate_fee(136, allow_fallback_to_static_rates=True)
@@ -156,12 +159,12 @@ class SwapManager(Logger):
self.lnwatcher.add_callback(swap.lockup_address, callback)
@log_exceptions
- async def normal_swap(self, lightning_amount, expected_onchain_amount, password):
+ async def normal_swap(self, lightning_amount, expected_onchain_amount, password, *, tx=None):
privkey = os.urandom(32)
pubkey = ECPrivkey(privkey).get_public_key_bytes(compressed=True)
key = await self.lnworker._add_request_coro(lightning_amount, 'swap', expiry=3600*24)
request = self.wallet.get_request(key)
- invoice = request['invoice']
+ invoice = request.invoice
lnaddr = self.lnworker._check_invoice(invoice, lightning_amount)
payment_hash = lnaddr.paymenthash
preimage = self.lnworker.get_preimage(payment_hash)
@@ -192,13 +195,20 @@ class SwapManager(Logger):
assert hash_160(preimage) == parsed_script[1][1]
assert pubkey == parsed_script[9][1]
assert locktime == int.from_bytes(parsed_script[6][1], byteorder='little')
- # check that onchain_amount is what was announced
+ # check that onchain_amount is not more than what we estimated
assert onchain_amount <= expected_onchain_amount, (onchain_amount, expected_onchain_amount)
# verify that they are not locking up funds for more than a day
assert locktime - self.network.get_local_height() < 144
# create funding tx
- outputs = [PartialTxOutput.from_address_and_value(lockup_address, onchain_amount)]
- tx = self.wallet.create_transaction(outputs=outputs, rbf=False, password=password)
+ funding_output = PartialTxOutput.from_address_and_value(lockup_address, expected_onchain_amount)
+ if tx is None:
+ tx = self.wallet.create_transaction(outputs=[funding_output], rbf=False, password=password)
+ else:
+ dummy_output = PartialTxOutput.from_address_and_value(ln_dummy_address(), expected_onchain_amount)
+ tx.outputs().remove(dummy_output)
+ tx.add_outputs([funding_output])
+ tx.set_rbf(False)
+ self.wallet.sign_transaction(tx, password)
# save swap data in wallet in case we need a refund
swap = SwapData(
redeem_script = redeem_script,
