tlnbase: more parts of channel establishment - electrum - Electrum Bitcoin wallet
HTML git clone https://git.parazyd.org/electrum
DIR Log
DIR Files
DIR Refs
DIR Submodules
---
DIR commit 668c3887d6ead44e12a559b49d161258104a3296
DIR parent 235341544531293cbfde177f1036b57234f62eb6
HTML Author: Janus <ysangkok@gmail.com>
Date: Thu, 12 Apr 2018 19:09:27 +0200
lnbase: more parts of channel establishment
Diffstat:
M lib/lnbase.py | 64 ++++++++++++++++++++++++-------
1 file changed, 50 insertions(+), 14 deletions(-)
---
DIR diff --git a/lib/lnbase.py b/lib/lnbase.py
t@@ -4,6 +4,8 @@
Derived from https://gist.github.com/AdamISZ/046d05c156aaeb56cc897f85eecb3eb8
"""
+from ecdsa.util import sigdecode_der, sigencode_string_canonize
+from ecdsa.curves import SECP256k1
import subprocess
import queue
import traceback
t@@ -23,6 +25,7 @@ from .bitcoin import public_key_from_private_key, ser_to_point, point_to_ser, st
from . import bitcoin
from .constants import set_testnet, set_simnet
from . import constants
+from . import transaction
from .util import PrintError
from .wallet import Wallet
from .storage import WalletStorage
t@@ -117,10 +120,14 @@ def gen_msg(msg_type, **kwargs):
except KeyError:
param = 0
try:
- if not isinstance(param, bytes): param = param.to_bytes(length=leng, byteorder="big")
+ if not isinstance(param, bytes):
+ assert isinstance(param, int), "field {} is neither bytes or int".format(k)
+ param = param.to_bytes(length=leng, byteorder="big")
except ValueError:
raise Exception("{} does not fit in {} bytes".format(k, leng))
lengths[k] = len(param)
+ if lengths[k] != leng:
+ raise Exception("field {} is {} bytes long, should be {} bytes long".format(k, lengths[k], leng))
data += param
return data
t@@ -218,12 +225,14 @@ def create_ephemeral_key(privkey):
pub = privkey_to_pubkey(privkey)
return (privkey[:32], pub)
-def get_unused_public_keys():
+def get_unused_keys():
xprv, xpub = bitcoin.bip32_root(b"testseed", "p2wpkh")
for i in itertools.count():
- childxpub = bitcoin.bip32_public_derivation(xpub, "m/", "m/42/"+str(i))
+ childxprv, childxpub = bitcoin.bip32_private_derivation(xprv, "m/", "m/42/"+str(i))
_, _, _, _, child_c, child_cK = bitcoin.deserialize_xpub(childxpub)
- yield child_cK
+ _, _, _, _, _, k = bitcoin.deserialize_xprv(childxprv)
+ assert len(k) == 32
+ yield child_cK, k
def aiosafe(f):
async def f2(*args, **kwargs):
t@@ -248,6 +257,7 @@ class Peer(PrintError):
self.read_buffer = b''
self.ping_time = 0
self.temporary_channel_id_to_incoming_accept_channel = {}
+ self.temporary_channel_id_to_incoming_funding_signed = {}
self.init_message_received_future = asyncio.Future()
def diagnostic_name(self):
t@@ -326,7 +336,10 @@ class Peer(PrintError):
f(payload)
def on_error(self, payload):
- self.temporary_channel_id_to_incoming_accept_channel[payload["channel_id"]].set_exception(LightningError(payload["data"]))
+ if payload["channel_id"] in self.temporary_channel_id_to_incoming_accept_channel:
+ self.temporary_channel_id_to_incoming_accept_channel[payload["channel_id"]].set_exception(LightningError(payload["data"]))
+ if payload["channel_id"] in self.temporary_channel_id_to_incoming_funding_signed:
+ self.temporary_channel_id_to_incoming_funding_signed[payload["channel_id"]].set_exception(LightningError(payload["data"]))
def on_ping(self, payload):
l = int.from_bytes(payload['num_pong_bytes'], byteorder="big")
t@@ -341,6 +354,9 @@ class Peer(PrintError):
tx = self.channels[channel_id]
self.network.broadcast(tx)
+ def on_funding_signed(self, payload):
+ self.temporary_channel_id_to_incoming_funding_signed[payload["temporary_channel_id"]].set_result(payload)
+
def on_funding_locked(self, payload):
pass
t@@ -367,19 +383,39 @@ class Peer(PrintError):
self.print_error('closing lnbase')
self.writer.close()
- async def channel_establishment_flow(self, wallet):
+ async def channel_establishment_flow(self, wallet, config):
await self.init_message_received_future
- pubkeys = get_unused_public_keys()
+ keys = get_unused_keys()
temp_channel_id = os.urandom(32)
- msg = gen_msg("open_channel", temporary_channel_id=temp_channel_id, chain_hash=bytes.fromhex(rev_hex(constants.net.GENESIS)), funding_satoshis=20000, max_accepted_htlcs=5, funding_pubkey=next(pubkeys), revocation_basepoint=next(pubkeys), htlc_basepoint=next(pubkeys), payment_basepoint=next(pubkeys), delayed_payment_basepoint=next(pubkeys), first_per_commitment_point=next(pubkeys))
+ funding_pubkey, funding_privkey = next(keys)
+ msg = gen_msg("open_channel", temporary_channel_id=temp_channel_id, chain_hash=bytes.fromhex(rev_hex(constants.net.GENESIS)), funding_satoshis=20000, max_accepted_htlcs=5, funding_pubkey=funding_pubkey, revocation_basepoint=next(keys)[0], htlc_basepoint=next(keys)[0], payment_basepoint=next(keys)[0], delayed_payment_basepoint=next(keys)[0], first_per_commitment_point=next(keys)[0])
self.temporary_channel_id_to_incoming_accept_channel[temp_channel_id] = asyncio.Future()
self.send_message(msg)
try:
accept_channel = await self.temporary_channel_id_to_incoming_accept_channel[temp_channel_id]
finally:
del self.temporary_channel_id_to_incoming_accept_channel[temp_channel_id]
- raise Exception("TODO: create funding transaction using wallet")
-
+ remote_pubkey = accept_channel["funding_pubkey"]
+ if int.from_bytes(remote_pubkey, byteorder="big") < int.from_bytes(funding_pubkey, byteorder="big"):
+ pubkeys = [remote_pubkey, funding_pubkey]
+ else:
+ pubkeys = [funding_pubkey, remote_pubkey]
+ scr = transaction.multisig_script([binascii.hexlify(x).decode("ascii") for x in pubkeys], 2)
+ #TODO support passwd, fix fee
+ tx = wallet.mktx([(bitcoin.TYPE_SCRIPT, scr, 20000)], None, config, 1000)
+ tx.sign({funding_pubkey: (funding_privkey, True)})
+ sig = bytes.fromhex(tx.inputs()[0]["signatures"][0])
+ sig = bytes(sig[:len(sig)-1])
+ r, s = sigdecode_der(sig, SECP256k1.generator.order())
+ sig = sigencode_string_canonize(r, s, SECP256k1.generator.order())
+ print(sig)
+
+ self.temporary_channel_id_to_incoming_funding_signed[temp_channel_id] = asyncio.Future()
+ self.send_message(gen_msg("funding_created", temporary_channel_id=temp_channel_id, funding_txid=bytes.fromhex(tx.txid()), funding_output_index=0, signature=sig))
+ try:
+ funding_signed = await self.temporary_channel_id_to_incoming_funding_signed[temp_channel_id]
+ finally:
+ del self.temporary_channel_id_to_incoming_funding_signed[temp_channel_id]
# replacement for lightningCall
class LNWorker:
t@@ -406,14 +442,14 @@ class LNWorker:
fut = asyncio.run_coroutine_threadsafe(self._test(q), asyncio.get_event_loop())
exp = q.get(timeout=5)
if exp is not None:
- raise exp
+ return exp
return "blocking test run took: " + str(time.time() - start)
async def _test(self, q):
try:
- await self.peer.channel_establishment_flow(self.wallet)
- except Exception as e:
- q.put(e)
+ await self.peer.channel_establishment_flow(self.wallet, self.network.config)
+ except Exception:
+ q.put(traceback.format_exc())
else:
q.put(None)