feat: CLN reconnect plugin

tools/reconnector/consts.py

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+PLUGIN_NAME = "reconnector"
+VERSION = "1.0.0"

tools/reconnector/plugin.py

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+#!/usr/bin/env python3
+
+import sys
+from typing import Any
+
+from consts import PLUGIN_NAME, VERSION
+from pyln.client import Plugin
+from reconnector_config import Config, register_options
+
+from reconnector import Reconnector
+
+pl = Plugin()
+register_options(pl)
+
+rec = Reconnector(pl)
+
+
+@pl.init()
+def init(
+    options: dict[str, Any],
+    configuration: dict[str, Any],
+    plugin: Plugin,
+    **kwargs: dict[str, Any],
+) -> None:
+    cfg = Config(pl, options)
+    rec.init(cfg)
+
+    pl.log(f"Plugin {PLUGIN_NAME} v{VERSION} initialized")
+
+
+@pl.subscribe("shutdown")
+def shutdown(**kwargs: dict[str, Any]) -> None:
+    pl.log(f"Plugin {PLUGIN_NAME} stopping")
+    rec.stop()
+
+    pl.log(f"Plugin {PLUGIN_NAME} stopped")
+    sys.exit(0)
+
+
+pl.run()

tools/reconnector/reconnector.py

@@ -0,0 +1,97 @@
+from threading import Timer
+
+from pyln.client import Plugin, RpcError
+from reconnector_config import Config
+
+
+class Reconnector:
+    _pl: Plugin
+    _pubkey: str
+
+    _timer: Timer | None
+    _custom_uris: dict[str, str]
+
+    def __init__(self, pl: Plugin) -> None:
+        self._pl = pl
+        self._pubkey = ""
+        self._timer = None
+        self._custom_uris = {}
+
+    def init(self, cfg: Config) -> None:
+        self._custom_uris = cfg.custom_uris
+        self._pubkey = self._pl.rpc.getinfo()["id"]
+
+        # Cancel in case there is a running timer
+        self.stop()
+
+        self._pl.log(f"Checking for falsy inactive channels every {cfg.check_interval} seconds")
+        self._timer = Timer(cfg.check_interval, self._check_inactive_channels)
+        self._timer.start()
+
+    def stop(self) -> None:
+        if self._timer is not None:
+            self._timer.cancel()
+            self._timer = None
+
+    def _check_inactive_channels(self) -> None:
+        channels = self._pl.rpc.listpeerchannels()["channels"]
+
+        for channel in channels:
+            if (
+                not channel["peer_connected"]
+                or channel["status"][0] != "CHANNELD_NORMAL:Reconnected, and reestablished."
+            ):
+                continue
+
+            channel_info = self._pl.rpc.listchannels(channel["short_channel_id"])["channels"]
+            if len(channel_info) != 2:
+                continue
+
+            our_policy = (
+                channel_info[0] if channel_info[0]["source"] == self._pubkey else channel_info[1]
+            )
+
+            if not our_policy["public"]:
+                continue
+
+            if not our_policy["active"]:
+                self._pl.log(
+                    f"Found falsely disabled channel with peer {channel['peer_id']}; reconnecting"
+                )
+                self._reconnect_channel(channel["peer_id"])
+
+    def _reconnect_channel(self, peer_id: str) -> None:
+        uris = self._get_node_uris(peer_id)
+
+        # todo: still disconnect and hope they connect to us?
+        if len(uris) == 0:
+            self._pl.log(f"Could not find public URI of peer {peer_id}; not reconnecting")
+            return
+
+        self._pl.rpc.disconnect(peer_id, True)
+        for uri in uris:
+            try:
+                self._pl.rpc.connect(uri)
+                self._pl.log(f"Reconnected to {peer_id}")
+                break
+
+            except RpcError as e:
+                self._pl.log(f"Could not connect to {uri}: {e!s}")
+
+    def _get_node_uris(self, peer_id: str) -> list[str]:
+        if peer_id in self._custom_uris:
+            return [self._custom_uris[peer_id]]
+
+        nodes = self._pl.rpc.listnodes(peer_id)["nodes"]
+        if len(nodes) == 0:
+            return []
+
+        addresses = nodes[0]["addresses"]
+
+        # Filter torv2
+        addresses = list(filter(lambda address: address["type"] != "torv2", addresses))
+
+        # Prefer clearnet to Tor connections
+        addresses.sort(key=lambda address: 1 if "tor" in address["type"] else 0)
+
+        return [f"{peer_id}@{address['address']}:{address['port']}" for address in addresses]

tools/reconnector/reconnector_config.py

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+import json
+from enum import Enum
+from typing import Any
+
+from consts import PLUGIN_NAME
+from pyln.client import Plugin
+
+
+class OptionKeys(str, Enum):
+    CheckInterval = f"{PLUGIN_NAME}-check-interval"
+    CustomUris = f"{PLUGIN_NAME}-custom-uris"
+
+
+class OptionDefaults(str, Enum):
+    CheckInterval = "120"
+    CustomUris = "[]"
+
+
+def register_options(pl: Plugin) -> None:
+    pl.add_option(
+        OptionKeys.CheckInterval,
+        OptionDefaults.CheckInterval,
+        "interval in seconds to check for disabled channels",
+    )
+    pl.add_option(
+        OptionKeys.CustomUris,
+        OptionDefaults.CustomUris,
+        "list of URIs that should be used instead of the publicly announced ones",
+    )
+
+
+class Config:
+    check_interval: int
+    custom_uris: dict[str, str]
+
+    def __init__(self, pl: Plugin, configuration: dict[str, Any]) -> None:
+        self.check_interval = int(configuration[OptionKeys.CheckInterval])
+
+        try:
+            self.custom_uris = Config._parse_uris(pl, configuration[OptionKeys.CustomUris])
+        except Exception as e:
+            pl.log(f"Could not decode custom URIs: {e!s}", level="warn")
+            self.custom_uris = {}
+
+    @staticmethod
+    def _parse_uris(pl: Plugin, uris_str: str) -> dict[str, str]:
+        uris_list: list[str] = json.loads(uris_str)
+        if not isinstance(uris_list, list):
+            msg = "not a list"
+            raise TypeError(msg)
+
+        uris: dict[str, str] = {}
+
+        for uri in uris_list:
+            split = uri.split("@")
+            if len(split) != 2:
+                pl.log(f'Ignoring custom URI because of invalid format: "{uri}"')
+                continue
+
+            uris[split[0].lower()] = uri
+
+        return uris

tools/reconnector/test_config.py

@@ -0,0 +1,83 @@
+from unittest.mock import MagicMock
+
+import pytest
+from reconnector_config import Config, OptionKeys
+
+
+class TestConfig:
+    @pytest.mark.parametrize(
+        ("params", "expected_interval", "expected_uris"),
+        [
+            ({OptionKeys.CheckInterval: 120, OptionKeys.CustomUris: "[]"}, 120, {}),
+            ({OptionKeys.CheckInterval: 60, OptionKeys.CustomUris: "[]"}, 60, {}),
+            ({OptionKeys.CheckInterval: 1, OptionKeys.CustomUris: "[]"}, 1, {}),
+            (
+                {
+                    OptionKeys.CheckInterval: 120,
+                    OptionKeys.CustomUris: '["02d96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018@'
+                    '45.86.229.190:9736"]',
+                },
+                120,
+                {
+                    "02d96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018": "02d96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018@45.86.229.190:9736"
+                },
+            ),
+            (
+                {
+                    OptionKeys.CheckInterval: 120,
+                    OptionKeys.CustomUris: '["02D96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018@'
+                    '45.86.229.190:9736"]',
+                },
+                120,
+                {
+                    "02d96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018": "02D96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018@45.86.229.190:9736"
+                },
+            ),
+            (
+                {
+                    OptionKeys.CheckInterval: 120,
+                    OptionKeys.CustomUris: "["
+                    '"02d96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018@45.86.229.190:9736",'
+                    '"026165850492521f4ac8abd9bd8088123446d126f648ca35e60f88177dc149ceb2@45.86.229.190:9735"'
+                    "]",
+                },
+                120,
+                {
+                    "02d96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018": "02d96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018@45.86.229.190:9736",
+                    "026165850492521f4ac8abd9bd8088123446d126f648ca35e60f88177dc149ceb2": "026165850492521f4ac8abd9bd8088123446d126f648ca35e60f88177dc149ceb2@45.86.229.190:9735",
+                },
+            ),
+            (
+                {
+                    OptionKeys.CheckInterval: 120,
+                    OptionKeys.CustomUris: "["
+                    '"02d96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018@45.86.229.190:9736",'
+                    '"026165850492521f4ac8abd9bd8088123446d126f648ca35e60f88177dc149ceb2"'
+                    "]",
+                },
+                120,
+                {
+                    "02d96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018": "02d96eadea3d780104449aca5c93461ce67c1564e2e1d73225fa67dd3b997a6018@45.86.229.190:9736",
+                },
+            ),
+            (
+                {
+                    OptionKeys.CheckInterval: 1,
+                    OptionKeys.CustomUris: '{"some": "otherData"}',
+                },
+                1,
+                {},
+            ),
+            ({OptionKeys.CheckInterval: 1, OptionKeys.CustomUris: "notJson"}, 1, {}),
+        ],
+    )
+    def test_parse(
+        self,
+        params: dict[str, str],
+        expected_interval: int,
+        expected_uris: dict[str, str],
+    ) -> None:
+        cfg = Config(MagicMock(), params)
+
+        assert cfg.check_interval == expected_interval
+        assert cfg.custom_uris == expected_uris