def execute(payload: dict):
my_id = plugin.rpc.getinfo().get('id')
peer_id = peer_from_scid(plugin, payload, payload['scid'], my_id)
get_channel(plugin, payload, peer_id, payload['scid']) # ensures or raises error
test_or_set_chunks(plugin, payload, my_id)
plugin.log("%s %s %d%% %d chunks" % (payload['command'], payload['scid'], payload['percentage'], payload['chunks']))
# iterate of chunks, default just one
for chunk in range(payload['chunks']):
# we discover remaining capacities for each chunk,
# as fees from previous chunks affect reserves
spendable, receivable = spendable_from_scid(plugin, payload)
total = spendable + receivable
amount = total * 0.01 * payload['percentage'] / payload['chunks']
# if capacity exceeds, limit amount to full or empty channel
if payload['command'] == "drain" and amount > spendable:
amount = spendable
if payload['command'] == "fill" and amount > receivable:
amount = receivable
result = False
try:
# we need to try with different HTLC_FEE values
# until we dont get capacity error on first hop
htlc_fee = HTLC_FEE_NUL
htlc_stp = HTLC_FEE_STP
while htlc_fee < HTLC_FEE_MAX and result is False:
# When getting close to 100% we need to account for HTLC commitment fee
if payload['command'] == 'drain' and spendable - amount <= htlc_fee:
if amount < htlc_fee:
raise RpcError(payload['command'], payload, {'message': 'channel too low to cover fees'})
amount -= htlc_fee
plugin.log("Trying... chunk:%s/%s spendable:%s receivable:%s htlc_fee:%s => amount:%s" % (chunk+1, payload['chunks'], spendable, receivable, htlc_fee, amount))
try:
result = try_for_htlc_fee(plugin, payload, my_id, peer_id, amount, chunk, spendable)
except Exception as err:
if "htlc_fee unknown" in str(err):
if htlc_fee == HTLC_FEE_NUL:
htlc_fee = HTLC_FEE_MIN - HTLC_FEE_STP
htlc_fee += htlc_stp
htlc_stp *= 1.1 # exponential increase steps
plugin.log("Retrying with additional HTLC onchain fees: %s" % htlc_fee)
continue
if "htlc_fee is" in str(err):
htlc_fee = Millisatoshi(str(err)[12:])
plugin.log("Retrying with exact HTLC onchain fees: %s" % htlc_fee)
continue
raise err
# If result is still false, we tried allowed htlc_fee range unsuccessfully
if result is False:
raise RpcError(payload['command'], payload, {'message': 'Cannot determine required htlc commitment fees.'})
except Exception as e:
return cleanup(plugin, payload, e)
return cleanup(plugin, payload)
def get_channel(plugin, payload, peer_id, scid):
peer = plugin.rpc.listpeers(peer_id).get('peers')[0]
channel = next(c for c in peer['channels'] if 'short_channel_id' in c and c['short_channel_id'] == scid)
if channel['state'] != "CHANNELD_NORMAL":
raise RpcError(payload['command'], payload, {'message': 'Channel %s not in state CHANNELD_NORMAL, but: %s' % (scid, channel['state']) })
if not peer['connected']:
raise RpcError(payload['command'], payload, {'message': 'Channel %s peer is not connected.' % scid})
return channel
def calc_optimal_amount(out_ours, out_total, in_ours, in_total, payload):
out_ours, out_total = int(out_ours), int(out_total)
in_ours, in_total = int(in_ours), int(in_total)
in_theirs = in_total - in_ours
vo = int(out_ours - (out_total / 2))
vi = int((in_total / 2) - in_ours)
# cases where one option can be eliminated because it exceeds other capacity
if vo > in_theirs and vi > 0 and vi < out_ours:
return Millisatoshi(vi)
if vi > out_ours and vo > 0 and vo < in_theirs:
return Millisatoshi(vo)
# cases where one channel is still capable to bring other to balance
if vo < 0 and vi > 0 and vi < out_ours:
return Millisatoshi(vi)
if vi < 0 and vo > 0 and vo < in_theirs:
return Millisatoshi(vo)
# when both options are possible take the one with least effort
if vo > 0 and vo < in_theirs and vi > 0 and vi < out_ours:
return Millisatoshi(min(vi, vo))
raise RpcError(
"rebalance", payload,
{'message': 'rebalancing these channels will make things worse'})
def setup_routing_fees(plugin, payload, route, amount, substractfees: bool=False):
delay = int(plugin.get_option('cltv-final'))
amount_iter = amount
for r in reversed(route):
r['msatoshi'] = amount_iter.millisatoshis
r['amount_msat'] = amount_iter
r['delay'] = delay
channels = plugin.rpc.listchannels(r['channel'])
ch = next(c for c in channels.get('channels') if c['destination'] == r['id'])
fee = Millisatoshi(ch['base_fee_millisatoshi'])
# BOLT #7 requires fee >= fee_base_msat + ( amount_to_forward * fee_proportional_millionths / 1000000 )
fee += (amount_iter * ch['fee_per_millionth'] + 10**6 - 1) // 10**6 # integer math trick to round up
amount_iter += fee
delay += ch['delay']
# amounts have to be calculated the other way when being fee substracted
# we took the upper loop as well for the delay parameter
if substractfees:
amount_iter = amount
first = True
for r in route:
channels = plugin.rpc.listchannels(r['channel'])
ch = next(c for c in channels.get('channels') if c['destination'] == r['id'])
if not first:
fee = Millisatoshi(ch['base_fee_millisatoshi'])
# BOLT #7 requires fee >= fee_base_msat + ( amount_to_forward * fee_proportional_millionths / 1000000 )
fee += (amount_iter * ch['fee_per_millionth'] + 10**6 - 1) // 10**6 # integer math trick to round up
if fee > amount_iter:
raise RpcError(payload['command'], payload, {'message': 'cannot cover fees to %s %s' % (payload['command'], amount)})
amount_iter -= fee
first = False
r['msatoshi'] = amount_iter.millisatoshis
r['amount_msat'] = amount_iter
def peer_from_scid(plugin, short_channel_id, my_node_id, payload):
channels = plugin.rpc.listchannels(short_channel_id).get('channels')
for ch in channels:
if ch['source'] == my_node_id:
return ch['destination']
raise RpcError(
"rebalance", payload,
{'message': 'Cannot find peer for channel: ' + short_channel_id})
def read_params(command: str, scid: str, percentage: float,
chunks: int, maxfeepercent: float, retry_for: int, exemptfee: Millisatoshi):
# check parameters
if command != 'drain' and command != 'fill' and command != 'setbalance':
raise RpcError(command, {}, {'message': 'Invalid command. Must be "drain", "fill" or "setbalance"'})
percentage = float(percentage)
if percentage < 0 or percentage > 100 or command != 'setbalance' and percentage == 0.0:
raise RpcError(command, {}, {'message': 'Percentage must be between 0 and 100'})
if chunks < 0:
raise RpcError(command, {}, {'message': 'Negative chunks do not make sense. Try a positive value or use 0 (default) for auto-detection.'})
# forge operation payload
payload = {
"command" : command,
"scid": scid,
"percentage": percentage,
"chunks": chunks,
"maxfeepercent": maxfeepercent,
"retry_for": retry_for,
"exemptfee": exemptfee,
"labels" : [],
"success_msg" : [],
}
# translate a 'setbalance' into respective drain or fill
if command == 'setbalance':
spendable, receivable = spendable_from_scid(plugin, payload)
total = spendable + receivable
target = total * 0.01 * payload['percentage']
if target == spendable:
raise RpcError(payload['command'], payload, {'message': 'target already reached, nothing to do.'})
if spendable > target:
payload['command'] = 'drain'
amount = spendable - target
else:
payload['command'] = 'fill'
amount = target - spendable
payload['percentage'] = 100.0 * int(amount) / int(total)
if payload['percentage'] == 0.0:
raise RpcError(command, payload, {'message': 'target already reached, nothing to do.'})
return payload
def cleanup(plugin, label, payload, success_msg, error=None):
try:
plugin.rpc.delinvoice(label, 'unpaid')
except RpcError as e:
# race condition: waitsendpay timed out, but invoice get paid
if 'status is paid' in e.error.get('message', ""):
return success_msg
if error is None:
error = RpcError("rebalance", payload, {'message': 'Rebalance failed'})
raise error
def init(configuration, options, plugin):
if not plugin.get_option('dblog-file'):
raise RpcError("No dblog-file specified")
plugin.conn = sqlite3.connect(plugin.get_option('dblog-file'),
isolation_level=None)
plugin.log("replaying pre-init data:")
for c in plugin.sqlite_pre_init_cmds:
plugin.conn.execute(c)
plugin.log("{}".format(c))
plugin.initted = True
plugin.log("initialized {}".format(configuration))
def cleanup(plugin, payload, error=None):
# delete all invoices and count how many went through
successful_chunks = 0
for label in payload['labels']:
try:
plugin.rpc.delinvoice(label, 'unpaid')
except RpcError as e:
# race condition: waitsendpay timed out, but invoice got paid
if 'status is paid' in e.error.get('message', ""):
successful_chunks += 1
if successful_chunks == payload['chunks']:
return payload['success_msg']
if successful_chunks > 0:
payload['success_msg'] += ['Partially completed %d/%d chunks. Error: %s' % (successful_chunks, payload['chunks'], str(error))]
return payload['success_msg']
if error is None:
error = RpcError(payload['command'], payload, {'message': 'Command failed, no chunk succeeded.'})
raise error
def setup_routing_fees(plugin, route, msatoshi, payload):
delay = int(plugin.get_option('cltv-final'))
for r in reversed(route):
r['msatoshi'] = r['amount_msat'] = msatoshi
r['delay'] = delay
channels = plugin.rpc.listchannels(r['channel'])
for ch in channels.get('channels'):
if ch['destination'] == r['id']:
fee = Millisatoshi(ch['base_fee_millisatoshi'])
fee += msatoshi * ch['fee_per_millionth'] // 1000000
if ch['source'] == payload['nodeid']:
if fee <= payload['msatoshi']:
fee = payload['msatoshi']
else:
raise RpcError(
"sendinvoiceless", payload,
{'message': 'Insufficient sending amount'})
msatoshi += fee
delay += ch['delay']
r['direction'] = int(ch['channel_flags']) % 2
def try_for_htlc_fee(plugin, payload, my_id, peer_id, amount, chunk, spendable_before):
start_ts = int(time.time())
label = payload['command'] + "-" + str(uuid.uuid4())
payload['labels'] += [label]
description = "%s %s %s%s [%d/%d]" % (payload['command'], payload['scid'], payload['percentage'], '%', chunk+1, payload['chunks'])
invoice = plugin.rpc.invoice("any", label, description, payload['retry_for'] + 60)
payment_hash = invoice['payment_hash']
plugin.log("Invoice payment_hash: %s" % payment_hash)
# exclude selected channel to prevent unwanted shortcuts
excludes = [payload['scid']+'/0', payload['scid']+'/1']
mychannels = plugin.rpc.listchannels(source=my_id).get('channels')
# exclude local channels known to have too little capacity.
# getroute currently does not do this.
for channel in mychannels:
if channel['short_channel_id'] == payload['scid']:
continue # already added few lines above
spend, recv = spendable_from_scid(plugin, payload, channel['short_channel_id'])
if payload['command'] == 'drain' and recv < amount:
excludes += [channel['short_channel_id']+'/0', channel['short_channel_id']+'/1']
if payload['command'] == 'fill' and spend < amount:
excludes += [channel['short_channel_id']+'/0', channel['short_channel_id']+'/1']
while int(time.time()) - start_ts < payload['retry_for']:
if payload['command'] == 'drain':
r = plugin.rpc.getroute(my_id, amount, riskfactor=0,
cltv=9, fromid=peer_id, fuzzpercent=0, exclude=excludes)
route_out = {'id': peer_id, 'channel': payload['scid'], 'direction': int(my_id >= peer_id)}
route = [route_out] + r['route']
setup_routing_fees(plugin, payload, route, amount, True)
if payload['command'] == 'fill':
r = plugin.rpc.getroute(peer_id, amount, riskfactor=0,
cltv=9, fromid=my_id, fuzzpercent=0, exclude=excludes)
route_in = {'id': my_id, 'channel': payload['scid'], 'direction': int(peer_id >= my_id)}
route = r['route'] + [route_in]
setup_routing_fees(plugin, payload, route, amount , False)
fees = route[0]['amount_msat'] - route[-1]['amount_msat']
# check fee and exclude worst channel the next time
# NOTE: the int(msat) casts are just a workaround for outdated pylightning versions
if fees > payload['exemptfee'] and int(fees) > int(amount) * payload['maxfeepercent'] / 100:
worst_channel_id = find_worst_channel(route)
if worst_channel_id is None:
raise RpcError(payload['command'], payload, {'message': 'Insufficient fee'})
excludes += [worst_channel_id + '/0', worst_channel_id + '/1']
continue
plugin.log("[%d/%d] Sending over %d hops to %s %s using %s fees" % (chunk+1, payload['chunks'], len(route), payload['command'], amount, fees))
for r in route:
plugin.log(" - %s %14s %s" % (r['id'], r['channel'], r['amount_msat']))
try:
plugin.rpc.sendpay(route, payment_hash, label)
result = plugin.rpc.waitsendpay(payment_hash, payload['retry_for'] + start_ts - int(time.time()))
if result.get('status') == 'complete':
payload['success_msg'] += ["%dmsat sent over %d hops to %s %dmsat [%d/%d]" % (amount + fees, len(route), payload['command'], amount, chunk+1, payload['chunks'])]
# we need to wait for gossipd to update to new state,
# so remaining amounts will be calculated correctly for the next chunk
spendable, _ = spendable_from_scid(plugin, payload)
while spendable == spendable_before:
time.sleep(0.5)
spendable, _ = spendable_from_scid(plugin, payload)
return True
return False
except RpcError as e:
erring_message = e.error.get('message', '')
erring_channel = e.error.get('data', {}).get('erring_channel')
erring_index = e.error.get('data', {}).get('erring_index')
erring_direction = e.error.get('data', {}).get('erring_direction')
# detect exceeding of HTLC commitment fee
if 'Capacity exceeded' in erring_message and erring_index == 0:
match = HTLC_FEE_PAT.search(erring_message)
if match: # new servers tell htlc_fee via exception (#2691)
raise ValueError("htlc_fee is %s" % match.group(1))
raise ValueError("htlc_fee unknown")
if erring_channel == payload['scid']:
raise RpcError(payload['command'], payload, {'message': 'Error with selected channel: %s' % erring_message})
plugin.log("RpcError: " + str(e))
if erring_channel is not None and erring_direction is not None:
excludes.append(erring_channel + '/' + str(erring_direction))
def test_or_set_chunks(plugin, payload, my_id):
scid = payload['scid']
cmd = payload['command']
spendable, receivable = spendable_from_scid(plugin, payload)
total = spendable + receivable
amount = total * 0.01 * payload['percentage']
# if capacity exceeds, limit amount to full or empty channel
if cmd == "drain" and amount > spendable:
amount = spendable
if cmd == "fill" and amount > receivable:
amount = receivable
# get all spendable/receivables for our channels
channels = {}
for channel in plugin.rpc.listchannels(source=my_id).get('channels'):
if channel['short_channel_id'] == scid:
continue
spend, recv = spendable_from_scid(plugin, payload, channel['short_channel_id'])
channels[channel['short_channel_id']] = {
'spendable' : spend,
'receivable' : recv,
}
# test if selected chunks fit into other channel capacities
if payload['chunks'] >= 1:
chunks = payload['chunks']
chunksize = amount / chunks
fit = 0
for i in channels:
channel = channels[i]
if cmd == "drain":
fit += int(channel['receivable']) // int(chunksize)
if cmd == "fill":
fit += int(channel['spendable']) // int(chunksize)
if fit >= chunks:
return
if cmd == "drain":
raise RpcError(payload['command'], payload, {'message': 'Selected chunks (%d) will not fit incoming channel capacities.' % chunks})
if cmd == "fill":
raise RpcError(payload['command'], payload, {'message': 'Selected chunks (%d) will not fit outgoing channel capacities.' % chunks})
# if chunks is 0 -> auto detect from 1 to 16 (max) chunks until amounts fit
else:
chunks = 0
while chunks < 16:
chunks += 1
chunksize = amount / chunks
fit = 0
for i in channels:
channel = channels[i]
if cmd == "drain" and int(channel['receivable']) > 0:
fit += int(channel['receivable']) // int(chunksize)
if cmd == "fill" and int(channel['spendable']) > 0:
fit += int(channel['spendable']) // int(chunksize)
if fit >= chunks:
payload['chunks'] = chunks
return
if cmd == "drain":
raise RpcError(payload['command'], payload, {'message': 'Cannot detect required chunks to perform operation. Incoming capacity problem.'})
if cmd == "fill":
raise RpcError(payload['command'], payload, {'message': 'Cannot detect required chunks to perform operation. Outgoing capacity problem.'})
def peer_from_scid(plugin, payload, short_channel_id, my_id):
channels = plugin.rpc.listchannels(short_channel_id).get('channels')
try:
return next(c for c in channels if c['source'] == my_id)['destination']
except StopIteration:
raise RpcError(payload['command'], payload, {'message': 'Cannot find peer for channel: ' + short_channel_id})
def rebalance(plugin,
outgoing_scid,
incoming_scid,
msatoshi: Millisatoshi = None,
maxfeepercent: float = 0.5,
retry_for: int = 60,
exemptfee: Millisatoshi = Millisatoshi(5000)):
"""Rebalancing channel liquidity with circular payments.
This tool helps to move some msatoshis between your channels.
"""
if msatoshi:
msatoshi = Millisatoshi(msatoshi)
maxfeepercent = float(maxfeepercent)
retry_for = int(retry_for)
exemptfee = Millisatoshi(exemptfee)
payload = {
"outgoing_scid": outgoing_scid,
"incoming_scid": incoming_scid,
"msatoshi": msatoshi,
"maxfeepercent": maxfeepercent,
"retry_for": retry_for,
"exemptfee": exemptfee
}
my_node_id = plugin.rpc.getinfo().get('id')
outgoing_node_id = peer_from_scid(plugin, outgoing_scid, my_node_id,
payload)
incoming_node_id = peer_from_scid(plugin, incoming_scid, my_node_id,
payload)
get_channel(plugin, payload, outgoing_node_id, outgoing_scid, True)
get_channel(plugin, payload, incoming_node_id, incoming_scid, True)
out_ours, out_total = amounts_from_scid(plugin, outgoing_scid)
in_ours, in_total = amounts_from_scid(plugin, incoming_scid)
plugin.log("Outgoing node: %s, channel: %s" %
(outgoing_node_id, outgoing_scid))
plugin.log("Incoming node: %s, channel: %s" %
(incoming_node_id, incoming_scid))
# If amount was not given, calculate a suitable 50/50 rebalance amount
if msatoshi is None:
msatoshi = calc_optimal_amount(out_ours, out_total, in_ours, in_total,
payload)
plugin.log("Estimating optimal amount %s" % msatoshi)
# Check requested amounts are selected channels
if msatoshi > out_ours or msatoshi > in_total - in_ours:
raise RpcError("rebalance", payload,
{'message': 'Channel capacities too low'})
route_out = {'id': outgoing_node_id, 'channel': outgoing_scid}
route_in = {'id': my_node_id, 'channel': incoming_scid}
start_ts = int(time.time())
label = "Rebalance-" + str(uuid.uuid4())
description = "%s to %s" % (outgoing_scid, incoming_scid)
invoice = plugin.rpc.invoice(msatoshi, label, description, retry_for + 60)
payment_hash = invoice['payment_hash']
plugin.log("Invoice payment_hash: %s" % payment_hash)
success_msg = ""
try:
excludes = []
# excude all own channels to prevent unwanted shortcuts [out,mid,in]
mychannels = plugin.rpc.listchannels(source=my_node_id)['channels']
for channel in mychannels:
excludes += [
channel['short_channel_id'] + '/0',
channel['short_channel_id'] + '/1'
]
while int(time.time()) - start_ts < retry_for:
r = plugin.rpc.getroute(incoming_node_id,
msatoshi,
riskfactor=1,
cltv=9,
fromid=outgoing_node_id,
exclude=excludes)
route_mid = r['route']
route = [route_out] + route_mid + [route_in]
setup_routing_fees(plugin, route, msatoshi)
fees = route[0]['amount_msat'] - msatoshi
# check fee and exclude worst channel the next time
# NOTE: the int(msat) casts are just a workaround for outdated pylightning versions
if fees > exemptfee and int(
fees) > int(msatoshi) * maxfeepercent / 100:
worst_channel_id = find_worst_channel(route)
if worst_channel_id is None:
raise RpcError("rebalance", payload,
{'message': 'Insufficient fee'})
excludes += [worst_channel_id + '/0', worst_channel_id + '/1']
continue
success_msg = "%d msat sent over %d hops to rebalance %d msat" % (
msatoshi + fees, len(route), msatoshi)
plugin.log("Sending %s over %d hops to rebalance %s" %
(msatoshi + fees, len(route), msatoshi))
for r in route:
plugin.log(" - %s %14s %s" %
(r['id'], r['channel'], r['amount_msat']))
try:
plugin.rpc.sendpay(route, payment_hash)
plugin.rpc.waitsendpay(payment_hash,
retry_for + start_ts - int(time.time()))
return success_msg
except RpcError as e:
plugin.log("RpcError: " + str(e))
erring_channel = e.error.get('data', {}).get('erring_channel')
if erring_channel == incoming_scid:
raise RpcError("rebalance", payload,
{'message': 'Error with incoming channel'})
if erring_channel == outgoing_scid:
raise RpcError("rebalance", payload,
{'message': 'Error with outgoing channel'})
erring_direction = e.error.get('data',
{}).get('erring_direction')
if erring_channel is not None and erring_direction is not None:
excludes.append(erring_channel + '/' +
str(erring_direction))
except Exception as e:
plugin.log("Exception: " + str(e))
return cleanup(plugin, label, payload, success_msg, e)
return cleanup(plugin, label, payload, success_msg)
def sendinvoiceless(plugin,
nodeid,
msatoshi: Millisatoshi,
maxfeepercent: float = 0.5,
retry_for: int = 60,
exemptfee: Millisatoshi = Millisatoshi(5000)):
"""Send invoiceless payments with circular routes.
This tool sends some msatoshis without needing to have an invoice from the receiving node.
"""
msatoshi = Millisatoshi(msatoshi)
maxfeepercent = float(maxfeepercent)
retry_for = int(retry_for)
exemptfee = Millisatoshi(exemptfee)
payload = {
"nodeid": nodeid,
"msatoshi": msatoshi,
"maxfeepercent": maxfeepercent,
"retry_for": retry_for,
"exemptfee": exemptfee
}
myid = plugin.rpc.getinfo().get('id')
label = "InvoicelessChange-" + str(uuid.uuid4())
description = "Sending %s to %s" % (msatoshi, nodeid)
change = Millisatoshi(1000)
invoice = plugin.rpc.invoice(change, label, description, retry_for + 60)
payment_hash = invoice['payment_hash']
plugin.log("Invoice payment_hash: %s" % payment_hash)
success_msg = ""
try:
excludes = []
start_ts = int(time.time())
while int(time.time()) - start_ts < retry_for:
forth = plugin.rpc.getroute(nodeid,
msatoshi + change,
riskfactor=10,
exclude=excludes)
back = plugin.rpc.getroute(myid,
change,
riskfactor=10,
fromid=nodeid,
exclude=excludes)
route = forth['route'] + back['route']
setup_routing_fees(plugin, route, change, payload)
fees = route[0]['amount_msat'] - route[-1]['amount_msat'] - msatoshi
# check fee and exclude worst channel the next time
# NOTE: the int(msat) casts are just a workaround for outdated pylightning versions
if fees > exemptfee and int(
fees) > int(msatoshi) * maxfeepercent / 100:
worst_channel = find_worst_channel(route, nodeid)
if worst_channel is None:
raise RpcError("sendinvoiceless", payload,
{'message': 'Insufficient fee'})
excludes.append(worst_channel)
continue
success_msg = "%d msat delivered with %d msat fee over %d hops" % (
msatoshi, fees, len(route))
plugin.log("Sending %s over %d hops to send %s and return %s" %
(route[0]['msatoshi'], len(route), msatoshi, change))
for r in route:
plugin.log(" - %s %14s %s" %
(r['id'], r['channel'], r['amount_msat']))
try:
plugin.rpc.sendpay(route, payment_hash)
plugin.rpc.waitsendpay(payment_hash,
retry_for + start_ts - int(time.time()))
return success_msg
except RpcError as e:
plugin.log("RpcError: " + str(e))
erring_channel = e.error.get('data', {}).get('erring_channel')
erring_direction = e.error.get('data',
{}).get('erring_direction')
if erring_channel is not None and erring_direction is not None:
excludes.append(erring_channel + '/' +
str(erring_direction))
except Exception as e:
plugin.log("Exception: " + str(e))
return cleanup(plugin, label, payload, success_msg, e)
return cleanup(plugin, label, payload, success_msg)
def sendinvoiceless(plugin,
nodeid,
msatoshi: Millisatoshi,
maxfeepercent="0.5",
retry_for=60,
exemptfee: Millisatoshi = Millisatoshi(5000)):
"""Invoiceless payment with circular routes.
This tool sends some msatoshis without needing to have an invoice from the receiving node.
"""
payload = {
"nodeid": nodeid,
"msatoshi": msatoshi,
"maxfeepercent": maxfeepercent,
"retry_for": retry_for,
"exemptfee": exemptfee
}
myid = plugin.rpc.getinfo().get('id')
label = "InvoicelessChange-" + str(uuid.uuid4())
description = "Sending %s to %s" % (msatoshi, nodeid)
change = Millisatoshi(1000)
invoice = plugin.rpc.invoice(change, label, description,
int(retry_for) + 60)
payment_hash = invoice['payment_hash']
plugin.log("Invoice payment_hash: %s" % payment_hash)
success_msg = ""
try:
excludes = []
start_ts = int(time.time())
while int(time.time()) - start_ts < int(retry_for):
forth = plugin.rpc.getroute(nodeid,
msatoshi + change,
riskfactor=10,
exclude=excludes)
back = plugin.rpc.getroute(myid,
change,
riskfactor=10,
fromid=nodeid,
exclude=excludes)
route = forth['route'] + back['route']
setup_routing_fees(plugin, route, change, payload)
fees = route[0]['msatoshi'] - route[-1]['msatoshi'] - msatoshi
# Next line would be correct, but must be fixed to work around #2601 - cleanup when merged
# if fees > exemptfee and fees > msatoshi * float(maxfeepercent) / 100:
if fees > exemptfee and int(
fees) > int(msatoshi) * float(maxfeepercent) / 100:
worst_channel = find_worst_channel(route, nodeid)
if worst_channel is None:
raise RpcError("sendinvoiceless", payload,
{'message': 'Insufficient fee'})
excludes.append(worst_channel)
continue
try:
plugin.log(
"Sending %s over %d hops to deliver %s and bring back %s" %
(route[0]['msatoshi'], len(route), msatoshi, change))
for r in route:
plugin.log("Node: %s, channel: %13s, %s" %
(r['id'], r['channel'], r['msatoshi']))
success_msg = "%d msat delivered with %d msat fee over %d hops" % (
msatoshi, fees, len(route))
plugin.rpc.sendpay(route, payment_hash)
plugin.rpc.waitsendpay(
payment_hash,
int(retry_for) + start_ts - int(time.time()))
return success_msg
except RpcError as e:
plugin.log("RpcError: " + str(e))
erring_channel = e.error.get('data', {}).get('erring_channel')
erring_direction = e.error.get('data',
{}).get('erring_direction')
if erring_channel is not None and erring_direction is not None:
excludes.append(erring_channel + '/' +
str(erring_direction))
except Exception as e:
plugin.log("Exception: " + str(e))
return sendinvoiceless_fail(plugin, label, payload, success_msg, e)
return sendinvoiceless_fail(plugin, label, payload, success_msg)