def openchannel_v2(plugin, node_id, amount):
change_output_weight = (9 + 22) * 4
funding_output_weight = (9 + 34) * 4
core_weight = 44
feerate_val = 2000
feerate = '{}perkw'.format(feerate_val)
funding = plugin.rpc.fundpsbt(amount, feerate, funding_output_weight + core_weight)
psbt_obj = psbt_from_base64(funding['psbt'])
excess = Millisatoshi(funding['excess_msat'])
# FIXME: convert feerate ?!
change_cost = Millisatoshi(change_output_weight * feerate_val // 1000 * 1000)
dust_limit = Millisatoshi(feerate_val * 1000)
if excess > (dust_limit + change_cost):
addr = plugin.rpc.newaddr()['bech32']
change = excess - change_cost
output = tx_output_init(int(change.to_satoshi()), get_script(addr))
psbt_add_output_at(psbt_obj, 0, 0, output)
resp = plugin.rpc.openchannel_init(node_id, amount,
psbt_to_base64(psbt_obj, 0),
commitment_feerate=feerate,
funding_feerate=feerate)
cid = resp['channel_id']
# We don't have an updates, so we send update until our peer is also
# finished
while not resp['commitments_secured']:
resp = plugin.rpc.openchannel_update(cid, resp['psbt'])
# fixme: pass in array of our input indexes to signonly
signed = plugin.rpc.signpsbt(resp['psbt'])
return plugin.rpc.openchannel_signed(cid, signed['signed_psbt'])
def on_openchannel(openchannel2, plugin, **kwargs):
# We mirror what the peer does, wrt to funding amount
amount = openchannel2['their_funding']
feerate = openchannel2['feerate_per_kw_funding']
locktime = openchannel2['locktime']
funding = plugin.rpc.fundpsbt(amount,
''.join([str(feerate), 'perkw']),
0,
reserve=True,
locktime=locktime)
psbt_obj = psbt_from_base64(funding['psbt'])
excess = Millisatoshi(funding['excess_msat'])
change_cost = Millisatoshi(164 * feerate // 1000 * 1000)
dust_limit = Millisatoshi(253 * 1000)
if excess > (dust_limit + change_cost):
addr = plugin.rpc.newaddr()['bech32']
change = excess - change_cost
output = tx_output_init(int(change.to_satoshi()), get_script(addr))
psbt_add_output_at(psbt_obj, 0, 0, output)
return {
'result': 'continue',
'psbt': psbt_to_base64(psbt_obj, 0),
'accepter_funding_msat': amount
}
def on_openchannel(openchannel2, plugin, **kwargs):
# We mirror what the peer does, wrt to funding amount ...
amount = Millisatoshi(openchannel2['their_funding'])
locktime = openchannel2['locktime']
if amount > plugin.max_fund:
plugin.log("amount adjusted from {} to {}".format(
amount, plugin.max_fund))
amount = plugin.max_fund
if amount == 0:
plugin.log("accepter_max_funding set to zero")
return {'result': 'continue'}
# ...unless they send us totally unacceptable feerates.
feerate = find_feerate(openchannel2['funding_feerate_best'],
openchannel2['funding_feerate_min'],
openchannel2['funding_feerate_max'],
openchannel2['feerate_our_min'],
openchannel2['feerate_our_max'])
# Their feerate range is out of bounds, we're not going to
# participate.
if not feerate:
plugin.log("Declining to fund, no feerate found.")
return {'result': 'continue'}
funding = plugin.rpc.fundpsbt(
int(amount.to_satoshi()),
'{}perkw'.format(feerate),
0, # because we're the accepter!!
reserve=True,
locktime=locktime,
minconf=0,
min_witness_weight=110)
psbt_obj = psbt_from_base64(funding['psbt'])
excess = Millisatoshi(funding['excess_msat'])
change_cost = Millisatoshi(124 * feerate)
dust_limit = Millisatoshi(253 * 1000)
if excess > (dust_limit + change_cost):
addr = plugin.rpc.newaddr()['bech32']
change = excess - change_cost
output = tx_output_init(change.to_whole_satoshi(), get_script(addr))
psbt_add_output_at(psbt_obj, 0, 0, output)
psbt = psbt_to_base64(psbt_obj, 0)
add_inflight(plugin, openchannel2['id'], openchannel2['channel_id'], psbt)
plugin.log("contributing {} at feerate {}".format(amount, feerate))
return {
'result': 'continue',
'psbt': psbt,
'accepter_funding_msat': amount,
'funding_feerate': feerate
}
def on_openchannel(openchannel2, plugin, **kwargs):
# We mirror what the peer does, wrt to funding amount ...
amount = openchannel2['their_funding']
locktime = openchannel2['locktime']
# ...unless they send us totally unacceptable feerates.
feerate = find_feerate(openchannel2['funding_feerate_best'],
openchannel2['funding_feerate_min'],
openchannel2['funding_feerate_max'],
openchannel2['feerate_our_min'],
openchannel2['feerate_our_max'])
# Their feerate range is out of bounds, we're not going to
# participate.
if not feerate:
return {'result': 'continue'}
funding = plugin.rpc.fundpsbt(amount,
'{}perkw'.format(feerate),
0,
reserve=True,
locktime=locktime,
min_witness_weight=110)
psbt_obj = psbt_from_base64(funding['psbt'])
excess = Millisatoshi(funding['excess_msat'])
change_cost = Millisatoshi(124 * feerate)
dust_limit = Millisatoshi(253 * 1000)
if excess > (dust_limit + change_cost):
addr = plugin.rpc.newaddr()['bech32']
change = excess - change_cost
output = tx_output_init(change.to_whole_satoshi(), get_script(addr))
psbt_add_output_at(psbt_obj, 0, 0, output)
return {
'result': 'continue',
'psbt': psbt_to_base64(psbt_obj, 0),
'accepter_funding_msat': amount,
'funding_feerate': feerate
}