move handle_error_code_from_failed_htlc to lnworker because it requires access to the network object

electrum/channel_db.py

@@ -39,8 +39,6 @@ from .util import bh2u, profiler, get_headers_dir, bfh, is_ip_address, list_enab
 from .logging import Logger
 from .lnutil import LN_GLOBAL_FEATURES_KNOWN_SET, LNPeerAddr, format_short_channel_id, ShortChannelID
 from .lnverifier import LNChannelVerifier, verify_sig_for_channel_update
-from .lnonion import OnionFailureCode
-from .lnmsg import decode_msg
 
 if TYPE_CHECKING:
     from .network import Network
@@ -387,57 +385,6 @@ class ChannelDB(SqlDB):
         # the update may be categorized as deprecated because of caching
         categorized_chan_upds = self.add_channel_updates([payload], verify=False)
 
-    def handle_error_code_from_failed_htlc(self, code, data, sender_idx, route, peer):
-        # handle some specific error codes
-        failure_codes = {
-            OnionFailureCode.TEMPORARY_CHANNEL_FAILURE: 0,
-            OnionFailureCode.AMOUNT_BELOW_MINIMUM: 8,
-            OnionFailureCode.FEE_INSUFFICIENT: 8,
-            OnionFailureCode.INCORRECT_CLTV_EXPIRY: 4,
-            OnionFailureCode.EXPIRY_TOO_SOON: 0,
-            OnionFailureCode.CHANNEL_DISABLED: 2,
-        }
-        if code in failure_codes:
-            offset = failure_codes[code]
-            channel_update_len = int.from_bytes(data[offset:offset+2], byteorder="big")
-            channel_update_as_received = data[offset+2: offset+2+channel_update_len]
-            channel_update_typed = (258).to_bytes(length=2, byteorder="big") + channel_update_as_received
-            # note: some nodes put channel updates in error msgs with the leading msg_type already there.
-            #       we try decoding both ways here.
-            try:
-                message_type, payload = decode_msg(channel_update_typed)
-                payload['raw'] = channel_update_typed
-            except:  # FIXME: too broad
-                message_type, payload = decode_msg(channel_update_as_received)
-                payload['raw'] = channel_update_as_received
-            categorized_chan_upds = self.add_channel_updates([payload])
-            blacklist = False
-            if categorized_chan_upds.good:
-                self.logger.info("applied channel update on our db")
-                peer.maybe_save_remote_update(payload)
-            elif categorized_chan_upds.orphaned:
-                # maybe it is a private channel (and data in invoice was outdated)
-                self.logger.info("maybe channel update is for private channel?")
-                start_node_id = route[sender_idx].node_id
-                self.add_channel_update_for_private_channel(payload, start_node_id)
-            elif categorized_chan_upds.expired:
-                blacklist = True
-            elif categorized_chan_upds.deprecated:
-                self.logger.info(f'channel update is not more recent.')
-                blacklist = True
-        else:
-            blacklist = True
-        if blacklist:
-            # blacklist channel after reporter node
-            # TODO this should depend on the error (even more granularity)
-            # also, we need finer blacklisting (directed edges; nodes)
-            try:
-                short_chan_id = route[sender_idx + 1].short_channel_id
-            except IndexError:
-                self.logger.info("payment destination reported error")
-            else:
-                self.network.path_finder.add_to_blacklist(short_chan_id)
-
     def create_database(self):
         c = self.conn.cursor()
         c.execute(create_node_info)

electrum/lnworker.py

@@ -48,6 +48,8 @@ from .lnutil import (Outpoint, LNPeerAddr,
                      NUM_MAX_EDGES_IN_PAYMENT_PATH, SENT, RECEIVED, HTLCOwner,
                      UpdateAddHtlc, Direction, LnLocalFeatures, format_short_channel_id,
                      ShortChannelID)
+from .lnonion import OnionFailureCode
+from .lnmsg import decode_msg
 from .i18n import _
 from .lnrouter import RouteEdge, is_route_sane_to_use
 from .address_synchronizer import TX_HEIGHT_LOCAL
@@ -888,11 +890,62 @@ class LNWallet(LNWorker):
         else:
             failure_msg, sender_idx = chan.decode_onion_error(reason, route, htlc.htlc_id)
             code, data = failure_msg.code, failure_msg.data
-            self.logger.info(f"UPDATE_FAIL_HTLC {repr(code)} {data}")
-            self.logger.info(f"error reported by {bh2u(route[sender_idx].node_id)}")
-            self.channel_db.handle_error_code_from_failed_htlc(code, data, sender_idx, route, peer)
+            self.handle_error_code_from_failed_htlc(code, data, sender_idx, route, peer)
         return success, preimage, sender_idx, failure_msg
 
+    def handle_error_code_from_failed_htlc(self, code, data, sender_idx, route, peer):
+        self.logger.info(f"UPDATE_FAIL_HTLC {repr(code)} {data}")
+        self.logger.info(f"error reported by {bh2u(route[sender_idx].node_id)}")
+        # handle some specific error codes
+        failure_codes = {
+            OnionFailureCode.TEMPORARY_CHANNEL_FAILURE: 0,
+            OnionFailureCode.AMOUNT_BELOW_MINIMUM: 8,
+            OnionFailureCode.FEE_INSUFFICIENT: 8,
+            OnionFailureCode.INCORRECT_CLTV_EXPIRY: 4,
+            OnionFailureCode.EXPIRY_TOO_SOON: 0,
+            OnionFailureCode.CHANNEL_DISABLED: 2,
+        }
+        if code in failure_codes:
+            offset = failure_codes[code]
+            channel_update_len = int.from_bytes(data[offset:offset+2], byteorder="big")
+            channel_update_as_received = data[offset+2: offset+2+channel_update_len]
+            channel_update_typed = (258).to_bytes(length=2, byteorder="big") + channel_update_as_received
+            # note: some nodes put channel updates in error msgs with the leading msg_type already there.
+            #       we try decoding both ways here.
+            try:
+                message_type, payload = decode_msg(channel_update_typed)
+                payload['raw'] = channel_update_typed
+            except:  # FIXME: too broad
+                message_type, payload = decode_msg(channel_update_as_received)
+                payload['raw'] = channel_update_as_received
+            categorized_chan_upds = self.channel_db.add_channel_updates([payload])
+            blacklist = False
+            if categorized_chan_upds.good:
+                self.logger.info("applied channel update on our db")
+                peer.maybe_save_remote_update(payload)
+            elif categorized_chan_upds.orphaned:
+                # maybe it is a private channel (and data in invoice was outdated)
+                self.logger.info("maybe channel update is for private channel?")
+                start_node_id = route[sender_idx].node_id
+                self.channel_db.add_channel_update_for_private_channel(payload, start_node_id)
+            elif categorized_chan_upds.expired:
+                blacklist = True
+            elif categorized_chan_upds.deprecated:
+                self.logger.info(f'channel update is not more recent.')
+                blacklist = True
+        else:
+            blacklist = True
+        if blacklist:
+            # blacklist channel after reporter node
+            # TODO this should depend on the error (even more granularity)
+            # also, we need finer blacklisting (directed edges; nodes)
+            try:
+                short_chan_id = route[sender_idx + 1].short_channel_id
+            except IndexError:
+                self.logger.info("payment destination reported error")
+            else:
+                self.network.path_finder.add_to_blacklist(short_chan_id)
+
     @staticmethod
     def _check_invoice(invoice, amount_sat=None):
         addr = lndecode(invoice, expected_hrp=constants.net.SEGWIT_HRP)