lightning: single shared instance of Watcher, ChannelDB and PathFinder

electrum/network.py

@@ -64,6 +64,10 @@ from .logging import get_logger, Logger
 _logger = get_logger(__name__)
 
 
+# lightning network
+from . import lnwatcher
+from . import lnrouter
+
 NODES_RETRY_INTERVAL = 60
 SERVER_RETRY_INTERVAL = 10
 NUM_TARGET_CONNECTED_SERVERS = 10
@@ -295,6 +299,11 @@ class Network(Logger):
 
         self._set_status('disconnected')
 
+        # lightning network
+        self.channel_db = lnrouter.ChannelDB()
+        self.path_finder = lnrouter.LNPathFinder(self.channel_db)
+        self.lnwatcher = lnwatcher.LNWatcher(self)
+
     def run_from_another_thread(self, coro):
         assert self._loop_thread != threading.current_thread(), 'must not be called from network thread'
         fut = asyncio.run_coroutine_threadsafe(coro, self.asyncio_loop)

lib/lnbase.py

@@ -592,7 +592,7 @@ class Peer(PrintError):
         self.lnworker = lnworker
         self.privkey = lnworker.privkey
         self.network = lnworker.network
-        self.channel_db = lnworker.channel_db
+        self.channel_db = lnworker.network.channel_db
         self.channel_state = lnworker.channel_state
         self.read_buffer = b''
         self.ping_time = 0
@@ -1118,7 +1118,7 @@ class Peer(PrintError):
         except IndexError:
             print("payment destination reported error")
 
-        self.lnworker.path_finder.blacklist.add(short_chan_id)
+        self.network.path_finder.blacklist.add(short_chan_id)
         self.update_fail_htlc[payload["channel_id"]].put_nowait("HTLC failure with code {} (categories {})".format(code, codes))
 
     @aiosafe
@@ -1126,7 +1126,7 @@ class Peer(PrintError):
         assert self.channel_state[chan.channel_id] == "OPEN"
         assert amount_msat > 0, "amount_msat is not greater zero"
         height = self.network.get_local_height()
-        route = self.lnworker.path_finder.create_route_from_path(path, self.lnworker.pubkey)
+        route = self.network.path_finder.create_route_from_path(path, self.lnworker.pubkey)
         hops_data = []
         sum_of_deltas = sum(route_edge.channel_policy.cltv_expiry_delta for route_edge in route[1:])
         total_fee = 0

lib/lnwatcher.py

@@ -4,7 +4,7 @@ from .bitcoin import redeem_script_to_address
 
 class LNWatcher(PrintError):
 
-    def __init__(self, network, channel_state):
+    def __init__(self, network):
         self.network = network
         self.watched_channels = {}
 

lib/lnworker.py

@@ -12,10 +12,8 @@ from .util import bh2u, bfh, PrintError
 from .constants import set_testnet, set_simnet
 from .lnbase import Peer, Outpoint, ChannelConfig, LocalState, RemoteState, Keypair, OnlyPubkeyKeypair, OpenChannel, ChannelConstraints, RevocationStore, calc_short_channel_id, privkey_to_pubkey
 from .lightning_payencode.lnaddr import lnencode, LnAddr, lndecode
-from . import lnrouter
 from .ecc import ECPrivkey, CURVE_ORDER, der_sig_from_sig_string
 from .transaction import Transaction
-from .lnwatcher import LNWatcher
 
 is_key = lambda k: k.endswith("_basepoint") or k.endswith("_key")
 
@@ -94,15 +92,12 @@ class LNWorker(PrintError):
         self.peers = {}
         # view of the network
         self.nodes = {}  # received node announcements
-        self.channel_db = lnrouter.ChannelDB()
-        self.path_finder = lnrouter.LNPathFinder(self.channel_db)
         self.channels = {x.channel_id: x for x in map(reconstruct_namedtuples, wallet.storage.get("channels", []))}
         self.invoices = wallet.storage.get('lightning_invoices', {})
         peer_list = network.config.get('lightning_peers', node_list)
         self.channel_state = {chan.channel_id: "DISCONNECTED" for chan in self.channels.values()}
-        self.lnwatcher = LNWatcher(network, self.channel_state)
         for chan_id, chan in self.channels.items():
-            self.lnwatcher.watch_channel(chan, self.on_channel_utxos)
+            self.network.lnwatcher.watch_channel(chan, self.on_channel_utxos)
         for host, port, pubkey in peer_list:
             self.add_peer(host, int(port), pubkey)
         # wait until we see confirmations
@@ -199,7 +194,7 @@ class LNWorker(PrintError):
         payment_hash = addr.paymenthash
         invoice_pubkey = addr.pubkey.serialize()
         amount_msat = int(addr.amount * COIN * 1000)
-        path = self.path_finder.find_path_for_payment(self.pubkey, invoice_pubkey, amount_msat)
+        path = self.network.path_finder.find_path_for_payment(self.pubkey, invoice_pubkey, amount_msat)
         if path is None:
             raise Exception("No path found")
         node_id, short_channel_id = path[0]