89 lines
3.0 KiB
Python
Executable File
89 lines
3.0 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Test plugin for executing the opener v2 protocol
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"""
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from pyln.client import Plugin, Millisatoshi
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from pyln.proto import bech32_decode
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from typing import Iterable, List, Optional
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from wallycore import psbt_add_output_at, psbt_from_base64, psbt_to_base64, tx_output_init
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plugin = Plugin()
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def convertbits(data: Iterable[int], frombits: int, tobits: int, pad: bool = True) -> Optional[List[int]]:
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"""General power-of-2 base conversion."""
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acc = 0
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bits = 0
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ret = []
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maxv = (1 << tobits) - 1
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max_acc = (1 << (frombits + tobits - 1)) - 1
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for value in data:
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if value < 0 or (value >> frombits):
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return None
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acc = ((acc << frombits) | value) & max_acc
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bits += frombits
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while bits >= tobits:
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bits -= tobits
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ret.append((acc >> bits) & maxv)
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if pad:
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if bits:
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ret.append((acc << (tobits - bits)) & maxv)
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elif bits >= frombits or ((acc << (tobits - bits)) & maxv):
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return None
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return ret
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def get_script(bech_addr):
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hrp, data = bech32_decode(bech_addr)
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# FIXME: verify hrp matches expected network
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wprog = convertbits(data[1:], 5, 8, False)
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wit_ver = data[0]
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if wit_ver > 16:
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raise ValueError("Invalid witness version {}".format(wit_ver[0]))
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return bytes([wit_ver + 0x50 if wit_ver > 0 else wit_ver, len(wprog)] + wprog)
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@plugin.method('openchannelv2')
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def openchannel_v2(plugin, node_id, amount):
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change_output_weight = (9 + 22) * 4
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funding_output_weight = (9 + 34) * 4
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core_weight = 44
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feerate_val = 2000
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feerate = '{}perkw'.format(feerate_val)
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funding = plugin.rpc.fundpsbt(amount, feerate, funding_output_weight + core_weight)
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psbt_obj = psbt_from_base64(funding['psbt'])
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excess = Millisatoshi(funding['excess_msat'])
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# FIXME: convert feerate ?!
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change_cost = Millisatoshi(change_output_weight * feerate_val // 1000 * 1000)
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dust_limit = Millisatoshi(feerate_val * 1000)
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if excess > (dust_limit + change_cost):
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addr = plugin.rpc.newaddr()['bech32']
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change = excess - change_cost
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output = tx_output_init(int(change.to_satoshi()), get_script(addr))
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psbt_add_output_at(psbt_obj, 0, 0, output)
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resp = plugin.rpc.openchannel_init(node_id, amount,
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psbt_to_base64(psbt_obj, 0),
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commitment_feerate=feerate,
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funding_feerate=feerate)
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cid = resp['channel_id']
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# We don't have an updates, so we send update until our peer is also
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# finished
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while not resp['commitments_secured']:
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resp = plugin.rpc.openchannel_update(cid, resp['psbt'])
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# fixme: pass in array of our input indexes to signonly
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signed = plugin.rpc.signpsbt(resp['psbt'])
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return plugin.rpc.openchannel_signed(cid, signed['signed_psbt'])
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@plugin.init()
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def init(options, configuration, plugin):
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plugin.log("df_opener.py initializing")
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plugin.run()
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