move channel_state into HTLCStateMachine

electrum/gui/qt/channels_list.py

@@ -20,12 +20,11 @@ class ChannelsList(MyTreeWidget):
         self.status = QLabel('')
 
     def format_fields(self, chan):
-        status = self.parent.wallet.lnworker.channel_state[chan.channel_id]
         return [
             bh2u(chan.node_id),
             self.parent.format_amount(chan.local_state.amount_msat//1000),
             self.parent.format_amount(chan.remote_state.amount_msat//1000),
-            status
+            chan.state
         ]
 
     def create_menu(self, position):

electrum/lnbase.py

@@ -292,7 +292,6 @@ class Peer(PrintError):
         self.privkey = lnworker.privkey
         self.network = lnworker.network
         self.channel_db = lnworker.network.channel_db
-        self.channel_state = lnworker.channel_state
         self.read_buffer = b''
         self.ping_time = 0
         self.initialized = asyncio.Future()
@@ -305,10 +304,13 @@ class Peer(PrintError):
         self.announcement_signatures = defaultdict(asyncio.Queue)
         self.update_fail_htlc = defaultdict(asyncio.Queue)
         self.localfeatures = (0x08 if request_initial_sync else 0)
-        self.channels = lnworker.channels_for_peer(pubkey)
         self.invoices = lnworker.invoices
         self.attempted_route = {}
 
+    @property
+    def channels(self):
+        return self.lnworker.channels_for_peer(self.pubkey)
+
     def diagnostic_name(self):
         return 'lnbase:' + str(self.host)
 
@@ -630,13 +632,14 @@ class Peer(PrintError):
         assert success, success
         m.remote_state = m.remote_state._replace(ctn=0)
         m.local_state = m.local_state._replace(ctn=0, current_commitment_signature=remote_sig)
+        m.state = 'OPENING'
         return m
 
     @aiosafe
     async def reestablish_channel(self, chan):
         await self.initialized
         chan_id = chan.channel_id
-        self.channel_state[chan_id] = 'REESTABLISHING'
+        chan.state = 'REESTABLISHING'
         self.network.trigger_callback('channel', chan)
         self.send_message(gen_msg("channel_reestablish",
             channel_id=chan_id,
@@ -644,7 +647,7 @@ class Peer(PrintError):
             next_remote_revocation_number=chan.remote_state.ctn
         ))
         await self.channel_reestablished[chan_id]
-        self.channel_state[chan_id] = 'OPENING'
+        chan.state = 'OPENING'
         if chan.local_state.funding_locked_received and chan.short_channel_id:
             self.mark_open(chan)
         self.network.trigger_callback('channel', chan)
@@ -684,6 +687,7 @@ class Peer(PrintError):
         channel_id = payload['channel_id']
         chan = self.channels.get(channel_id)
         if not chan:
+            print(self.channels)
             raise Exception("Got unknown funding_locked", channel_id)
         if not chan.local_state.funding_locked_received:
             our_next_point = chan.remote_state.next_per_commitment_point
@@ -750,10 +754,10 @@ class Peer(PrintError):
         print("SENT CHANNEL ANNOUNCEMENT")
 
     def mark_open(self, chan):
-        if self.channel_state[chan.channel_id] == "OPEN":
+        if chan.state == "OPEN":
             return
         assert chan.local_state.funding_locked_received
-        self.channel_state[chan.channel_id] = "OPEN"
+        chan.state = "OPEN"
         self.network.trigger_callback('channel', chan)
         # add channel to database
         sorted_keys = list(sorted([self.pubkey, self.lnworker.pubkey]))
@@ -827,7 +831,7 @@ class Peer(PrintError):
 
     @aiosafe
     async def pay(self, path, chan, amount_msat, payment_hash, pubkey_in_invoice, min_final_cltv_expiry):
-        assert self.channel_state[chan.channel_id] == "OPEN"
+        assert chan.state == "OPEN"
         assert amount_msat > 0, "amount_msat is not greater zero"
         height = self.network.get_local_height()
         route = self.network.path_finder.create_route_from_path(path, self.lnworker.pubkey)
@@ -929,7 +933,7 @@ class Peer(PrintError):
         htlc_id = int.from_bytes(htlc["id"], 'big')
         assert htlc_id == chan.remote_state.next_htlc_id, (htlc_id, chan.remote_state.next_htlc_id)
 
-        assert self.channel_state[channel_id] == "OPEN"
+        assert chan.state == "OPEN"
 
         cltv_expiry = int.from_bytes(htlc["cltv_expiry"], 'big')
         # TODO verify sanity of their cltv expiry

electrum/lnhtlc.py

@@ -139,6 +139,8 @@ class HTLCStateMachine(PrintError):
         self.local_commitment = self.pending_local_commitment
         self.remote_commitment = self.pending_remote_commitment
 
+        self.state = 'DISCONNECTED'
+
     def add_htlc(self, htlc):
         """
         AddHTLC adds an HTLC to the state machine's local update log. This method

electrum/lnworker.py

@@ -40,7 +40,6 @@ class LNWorker(PrintError):
         self.peers = {}
         self.channels = {x.channel_id: x for x in map(HTLCStateMachine, wallet.storage.get("channels", []))}
         self.invoices = wallet.storage.get('lightning_invoices', {})
-        self.channel_state = {chan.channel_id: "DISCONNECTED" for chan in self.channels.values()}
         for chan_id, chan in self.channels.items():
             self.network.lnwatcher.watch_channel(chan, self.on_channel_utxos)
         peer_list = self.config.get('lightning_peers', node_list)
@@ -71,8 +70,6 @@ class LNWorker(PrintError):
 
     def save_channel(self, openchannel):
         assert type(openchannel) is HTLCStateMachine
-        if openchannel.channel_id not in self.channel_state:
-            self.channel_state[openchannel.channel_id] = "OPENING"
         self.channels[openchannel.channel_id] = openchannel
         if openchannel.remote_state.next_per_commitment_point == openchannel.remote_state.current_per_commitment_point:
             raise Exception("Tried to save channel with next_point == current_point, this should not happen")
@@ -87,7 +84,7 @@ class LNWorker(PrintError):
 
         If the Funding TX has not been mined, return None
         """
-        assert self.channel_state[chan.channel_id] in ["OPEN", "OPENING"]
+        assert chan.state in ["OPEN", "OPENING"]
         peer = self.peers[chan.node_id]
         conf = self.wallet.get_tx_height(chan.funding_outpoint.txid)[1]
         if conf >= chan.constraints.funding_txn_minimum_depth:
@@ -104,26 +101,30 @@ class LNWorker(PrintError):
     def on_channel_utxos(self, chan, utxos):
         outpoints = [Outpoint(x["tx_hash"], x["tx_pos"]) for x in utxos]
         if chan.funding_outpoint not in outpoints:
-            self.channel_state[chan.channel_id] = "CLOSED"
+            chan.state = "CLOSED"
             # FIXME is this properly GC-ed? (or too soon?)
             LNChanCloseHandler(self.network, self.wallet, chan)
-        elif self.channel_state[chan.channel_id] == 'DISCONNECTED':
+        elif chan.state == 'DISCONNECTED':
+            if chan.node_id not in self.peers:
+                self.print_error("received channel_utxos for channel which does not have peer (errored?)")
+                return
             peer = self.peers[chan.node_id]
             coro = peer.reestablish_channel(chan)
             asyncio.run_coroutine_threadsafe(coro, self.network.asyncio_loop)
 
     def on_network_update(self, event, *args):
         for chan in self.channels.values():
-            peer = self.peers[chan.node_id]
-            if self.channel_state[chan.channel_id] == "OPENING":
+            if chan.state == "OPENING":
                 res = self.save_short_chan_id(chan)
                 if not res:
                     self.print_error("network update but funding tx is still not at sufficient depth")
                     continue
                 # this results in the channel being marked OPEN
+                peer = self.peers[chan.node_id]
                 peer.funding_locked(chan)
-            elif self.channel_state[chan.channel_id] == "OPEN":
+            elif chan.state == "OPEN":
                 conf = self.wallet.get_tx_height(chan.funding_outpoint.txid)[1]
+                peer = self.peers[chan.node_id]
                 peer.on_network_update(chan, conf)
 
     async def _open_channel_coroutine(self, node_id, local_amount_sat, push_sat, password):

electrum/tests/test_lnrouter.py

@@ -31,9 +31,9 @@ class Test_LNRouter(unittest.TestCase):
             path_finder = lnrouter.LNPathFinder(fake_network.channel_db)
             privkey = bitcoin.sha256('privkeyseed')
             network = fake_network
-            channel_state = {}
             channels = []
             invoices = {}
+            channels_for_peer = lambda x: []
         p = Peer(fake_ln_worker, '', 0, 'a')
         p.on_channel_announcement({'node_id_1': b'b', 'node_id_2': b'c', 'short_channel_id': bfh('0000000000000001')})
         p.on_channel_announcement({'node_id_1': b'b', 'node_id_2': b'e', 'short_channel_id': bfh('0000000000000002')})