XAddLocalChanAliases

XAddLocalChanAliases is an experimental API that creates a set of new channel SCID alias mappings. The final total set of aliases in the manager after the add operation is returned. This is only a locally stored alias, and will not be communicated to the channel peer via any message. Therefore, routing over such an alias will only work if the peer also calls this same RPC on their end. If an alias already exists, an error is returned

Source: routerrpc/router.proto

gRPC

rpc XAddLocalChanAliases (AddAliasesRequest) returns (AddAliasesResponse);

REST

HTTP Method	Path
POST	/v2/router/x/addaliases

Code Samples

gRPC

Javascript

const fs = require('fs');
const grpc = require('@grpc/grpc-js');
const protoLoader = require('@grpc/proto-loader');

const GRPC_HOST = 'localhost:10009'
const MACAROON_PATH = 'LND_DIR/data/chain/bitcoin/regtest/admin.macaroon'
const TLS_PATH = 'LND_DIR/tls.cert'

const loaderOptions = {
  keepCase: true,
  longs: String,
  enums: String,
  defaults: true,
  oneofs: true,
};
const packageDefinition = protoLoader.loadSync(['lightning.proto', 'routerrpc/router.proto'], loaderOptions);
const routerrpc = grpc.loadPackageDefinition(packageDefinition).routerrpc;
process.env.GRPC_SSL_CIPHER_SUITES = 'HIGH+ECDSA';
const tlsCert = fs.readFileSync(TLS_PATH);
const sslCreds = grpc.credentials.createSsl(tlsCert);
const macaroon = fs.readFileSync(MACAROON_PATH).toString('hex');
const macaroonCreds = grpc.credentials.createFromMetadataGenerator(function(args, callback) {
  let metadata = new grpc.Metadata();
  metadata.add('macaroon', macaroon);
  callback(null, metadata);
});
let creds = grpc.credentials.combineChannelCredentials(sslCreds, macaroonCreds);
let client = new routerrpc.Router(GRPC_HOST, creds);
let request = {
  alias_maps: <AliasMap>,
};
client.xAddLocalChanAliases(request, function(err, response) {
  console.log(response);
});
// Console output:
//  {
//    "alias_maps": <AliasMap>,
//  }

Python

import codecs, grpc, os
# Generate the following 2 modules by compiling the routerrpc/router.proto with the grpcio-tools.
# See https://github.com/lightningnetwork/lnd/blob/master/docs/grpc/python.md for instructions.
import router_pb2 as routerrpc, router_pb2_grpc as routerstub

GRPC_HOST = 'localhost:10009'
MACAROON_PATH = 'LND_DIR/data/chain/bitcoin/regtest/admin.macaroon'
TLS_PATH = 'LND_DIR/tls.cert'

# create macaroon credentials
macaroon = codecs.encode(open(MACAROON_PATH, 'rb').read(), 'hex')
def metadata_callback(context, callback):
  callback([('macaroon', macaroon)], None)
auth_creds = grpc.metadata_call_credentials(metadata_callback)
# create SSL credentials
os.environ['GRPC_SSL_CIPHER_SUITES'] = 'HIGH+ECDSA'
cert = open(TLS_PATH, 'rb').read()
ssl_creds = grpc.ssl_channel_credentials(cert)
# combine macaroon and SSL credentials
combined_creds = grpc.composite_channel_credentials(ssl_creds, auth_creds)
# make the request
channel = grpc.secure_channel(GRPC_HOST, combined_creds)
stub = routerstub.RouterStub(channel)
request = routerrpc.AddAliasesRequest(
  alias_maps=<AliasMap>,
)
response = stub.XAddLocalChanAliases(request)
print(response)
# {
#    "alias_maps": <AliasMap>,
# }

REST

Javascript

const fs = require('fs');
const request = require('request');

const REST_HOST = 'localhost:8080'
const MACAROON_PATH = 'LND_DIR/data/chain/bitcoin/regtest/admin.macaroon'

let requestBody = {
  alias_maps: <array>, // <AliasMap> 
};
let options = {
  url: `https://${REST_HOST}/v2/router/x/addaliases`,
  // Work-around for self-signed certificates.
  rejectUnauthorized: false,
  json: true,
  headers: {
    'Grpc-Metadata-macaroon': fs.readFileSync(MACAROON_PATH).toString('hex'),
  },
  form: JSON.stringify(requestBody),
}
request.post(options, function(error, response, body) {
  console.log(body);
});
// Console output:
//  {
//    "alias_maps": <array>, // <AliasMap> 
//  }

Python

import base64, codecs, json, requests

REST_HOST = 'localhost:8080'
MACAROON_PATH = 'LND_DIR/data/chain/bitcoin/regtest/admin.macaroon'
TLS_PATH = 'LND_DIR/tls.cert'

url = f'https://{REST_HOST}/v2/router/x/addaliases'
macaroon = codecs.encode(open(MACAROON_PATH, 'rb').read(), 'hex')
headers = {'Grpc-Metadata-macaroon': macaroon}
data = {
  'alias_maps': <AliasMap>,
}
r = requests.post(url, headers=headers, data=json.dumps(data), verify=TLS_PATH)
print(r.json())
# {
#    "alias_maps": <AliasMap>,
# }

Shell

# There is no CLI command for this RPC

Messages

routerrpc.AddAliasesRequest

Source: routerrpc/router.proto

Field	gRPC Type	REST Type	REST Placement
alias_maps	AliasMap[]	array	body

routerrpc.AddAliasesResponse

Source: routerrpc/router.proto

Field	gRPC Type	REST Type
alias_maps	AliasMap[]	array

Nested Messages

lnrpc.AliasMap

Field	gRPC Type	REST Type
base_scid For non-zero-conf channels, this is the confirmed SCID. Otherwise, this is the first assigned "base" alias.	uint64	string
aliases The set of all aliases stored for the base SCID.	uint64[]	array