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pyln-client/gossmap: adds channel satoshi capacity

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This reads the `gossip_store_channel_amount` that always follows the
`channel_announcement` messages. Therefore it uses an internal variable
_last_scid to know what channel has been added last time.
This commit is contained in:
Michael Schmoock 2021-09-08 06:24:57 +09:30 • committed by Rusty Russell
parent c5c909acd3
commit b6ed405d8c
1 changed files with 11 additions and 2 deletions
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13
contrib/pyln-client/pyln/client/gossmap.py
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@ -20,6 +20,7 @@ WIRE_GOSSIP_STORE_PRIVATE_CHANNEL = 4104
WIRE_GOSSIP_STORE_PRIVATE_UPDATE = 4102
WIRE_GOSSIP_STORE_DELETE_CHAN = 4103
WIRE_GOSSIP_STORE_ENDED = 4105
WIRE_GOSSIP_STORE_CHANNEL_AMOUNT = 4101
class GossipStoreHeader(object):
@ -60,8 +61,7 @@ class GossmapChannel(object):
self.node2_id = node2_id
self.updates_fields: List[Optional[Dict[str, Any]]] = [None, None]
self.updates_offset: List[Optional[int]] = [None, None]
self.capacity = None # TODO: where do we get this?
self.satoshis = None
self.half_channels: List[GossmapHalfchannel] = [None, None]
def update_channel(self,
@ -135,6 +135,7 @@ class Gossmap(object):
self.store_buf = bytes()
self.nodes: Dict[bytes, GossmapNode] = {}
self.channels: Dict[ShortChannelId, GossmapChannel] = {}
self._last_scid: str = None
version = self.store_file.read(1)
if version[0] != GOSSIP_STORE_VERSION:
raise ValueError("Invalid gossip store version {}".format(version))
@ -156,6 +157,7 @@ class Gossmap(object):
if node2_id not in self.nodes:
self.nodes[node2_id] = GossmapNode(node2_id)
self._last_scid = scid
self.channels[scid] = c
self.nodes[node1_id].channels.append(c)
self.nodes[node2_id].channels.append(c)
@ -179,6 +181,11 @@ class Gossmap(object):
GossmapNodeId(fields['node_id_1']), GossmapNodeId(fields['node_id_2']),
is_private)
def _set_channel_amount(self, rec: bytes):
""" Sets channel capacity of last added channel """
sats, = struct.unpack(">Q", rec[2:])
self.channels[self._last_scid].satoshis = sats
def get_channel(self, short_channel_id: ShortChannelId):
""" Resolves a channel by its short channel id """
if type(short_channel_id) == str:
@ -252,6 +259,8 @@ class Gossmap(object):
self.add_channel(rec, off, False)
elif rectype == WIRE_GOSSIP_STORE_PRIVATE_CHANNEL:
self.add_channel(rec[2 + 8 + 2:], off + 2 + 8 + 2, True)
elif rectype == WIRE_GOSSIP_STORE_CHANNEL_AMOUNT:
self._set_channel_amount(rec)
elif rectype == channel_update.number:
self.update_channel(rec, off)
elif rectype == WIRE_GOSSIP_STORE_PRIVATE_UPDATE: