Store & expose node extension TLV data in backend

backend/src/api/database-migration.ts

@@ -4,7 +4,7 @@ import logger from '../logger';
 import { Common } from './common';
 
 class DatabaseMigration {
-  private static currentVersion = 42;
+  private static currentVersion = 43;
   private queryTimeout = 120000;
   private statisticsAddedIndexed = false;
   private uniqueLogs: string[] = [];
@@ -356,6 +356,10 @@ class DatabaseMigration {
     if (databaseSchemaVersion < 42 && isBitcoin === true) {
       await this.$executeQuery('ALTER TABLE `channels` ADD closing_resolved tinyint(1) DEFAULT 0');
     }
+
+    if (databaseSchemaVersion < 43 && isBitcoin === true) {
+      await this.$executeQuery(this.getCreateLNNodeRecordsTableQuery(), await this.$checkIfTableExists('nodes_records'));
+    }
   }
 
   /**
@@ -791,6 +795,19 @@ class DatabaseMigration {
     ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
   }
 
+  private getCreateLNNodeRecordsTableQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS nodes_records (
+      public_key varchar(66) NOT NULL,
+      type int(10) unsigned NOT NULL,
+      payload blob NOT NULL,
+      UNIQUE KEY public_key_type (public_key, type),
+      INDEX (public_key),
+      FOREIGN KEY (public_key)
+        REFERENCES nodes (public_key)
+        ON DELETE CASCADE
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
   public async $truncateIndexedData(tables: string[]) {
     const allowedTables = ['blocks', 'hashrates', 'prices'];
 

backend/src/api/explorer/nodes.api.ts

@@ -105,6 +105,18 @@ class NodesApi {
         node.closed_channel_count = rows[0].closed_channel_count;
       }
 
+      // Custom records
+      query = `
+        SELECT type, payload
+        FROM nodes_records
+        WHERE public_key = ?
+      `;
+      [rows] = await DB.query(query, [public_key]);
+      node.custom_records = {};
+      for (const record of rows) {
+        node.custom_records[record.type] = Buffer.from(record.payload, 'binary').toString('hex');
+      }
+
       return node;
     } catch (e) {
       logger.err(`Cannot get node information for ${public_key}. Reason: ${(e instanceof Error ? e.message : e)}`);

backend/src/api/lightning/clightning/clightning-convert.ts

@@ -7,6 +7,15 @@ import { Common } from '../../common';
  * Convert a clightning "listnode" entry to a lnd node entry
  */
 export function convertNode(clNode: any): ILightningApi.Node {
+  let custom_records: { [type: number]: string } | undefined = undefined;
+  if (clNode.option_will_fund) {
+    try {
+      custom_records = { '1': Buffer.from(clNode.option_will_fund.compact_lease || '', 'hex').toString('base64') };
+    } catch (e) {
+      logger.err(`Cannot decode option_will_fund compact_lease for ${clNode.nodeid}). Reason: ` + (e instanceof Error ? e.message : e));
+      custom_records = undefined;
+    }
+  }
   return {
     alias: clNode.alias ?? '',
     color: `#${clNode.color ?? ''}`,
@@ -23,6 +32,7 @@ export function convertNode(clNode: any): ILightningApi.Node {
       };
     }) ?? [],
     last_update: clNode?.last_timestamp ?? 0,
+    custom_records
   };
 }
 

backend/src/api/lightning/lightning-api.interface.ts

@@ -49,6 +49,7 @@ export namespace ILightningApi {
     }[];
     color: string;
     features: { [key: number]: Feature };
+    custom_records?: { [type: number]: string };
   }
 
   export interface Info {

backend/src/repositories/NodeRecordsRepository.ts

@@ -0,0 +1,67 @@
+import { ResultSetHeader, RowDataPacket } from 'mysql2';
+import DB from '../database';
+import logger from '../logger';
+
+export interface NodeRecord {
+  publicKey: string; // node public key
+  type: number; // TLV extension record type
+  payload: string; // base64 record payload
+}
+
+class NodesRecordsRepository {
+  public async $saveRecord(record: NodeRecord): Promise<void> {
+    try {
+      const payloadBytes = Buffer.from(record.payload, 'base64');
+      await DB.query(`
+        INSERT INTO nodes_records(public_key, type, payload)
+        VALUE (?, ?, ?)
+        ON DUPLICATE KEY UPDATE
+          payload = ?
+      `, [record.publicKey, record.type, payloadBytes, payloadBytes]);
+    } catch (e: any) {
+      if (e.errno !== 1062) { // ER_DUP_ENTRY - Not an issue, just ignore this
+        logger.err(`Cannot save node record (${[record.publicKey, record.type, record.payload]}) into db. Reason: ` + (e instanceof Error ? e.message : e));
+        // We don't throw, not a critical issue if we miss some nodes records
+      }
+    }
+   }
+
+  public async $getRecordTypes(publicKey: string): Promise<any> {
+    try {
+      const query = `
+        SELECT type FROM nodes_records
+        WHERE public_key = ?
+      `;
+      const [rows] = await DB.query<RowDataPacket[][]>(query, [publicKey]);
+      return rows.map(row => row['type']);
+    } catch (e) {
+      logger.err(`Cannot retrieve custom records for ${publicKey} from db. Reason: ` + (e instanceof Error ? e.message : e));
+      return [];
+    }
+  }
+
+  public async $deleteUnusedRecords(publicKey: string, recordTypes: number[]): Promise<number> {
+    try {
+      let query;
+      if (recordTypes.length) {
+        query = `
+          DELETE FROM nodes_records
+          WHERE public_key = ?
+          AND type NOT IN (${recordTypes.map(type => `${type}`).join(',')})
+        `;
+      } else {
+        query = `
+          DELETE FROM nodes_records
+          WHERE public_key = ?
+        `;
+      }
+      const [result] = await DB.query<ResultSetHeader>(query, [publicKey]);
+      return result.affectedRows;
+    } catch (e) {
+      logger.err(`Cannot delete unused custom records for ${publicKey} from db. Reason: ` + (e instanceof Error ? e.message : e));
+      return 0;
+    }
+  }
+}
+
+export default new NodesRecordsRepository();

backend/src/tasks/lightning/network-sync.service.ts

@@ -13,6 +13,7 @@ import fundingTxFetcher from './sync-tasks/funding-tx-fetcher';
 import NodesSocketsRepository from '../../repositories/NodesSocketsRepository';
 import { Common } from '../../api/common';
 import blocks from '../../api/blocks';
+import NodeRecordsRepository from '../../repositories/NodeRecordsRepository';
 
 class NetworkSyncService {
   loggerTimer = 0;
@@ -63,6 +64,7 @@ class NetworkSyncService {
     let progress = 0;
 
     let deletedSockets = 0;
+    let deletedRecords = 0;
     const graphNodesPubkeys: string[] = [];
     for (const node of nodes) {
       const latestUpdated = await channelsApi.$getLatestChannelUpdateForNode(node.pub_key);
@@ -84,8 +86,23 @@ class NetworkSyncService {
         addresses.push(socket.addr);
       }
       deletedSockets += await NodesSocketsRepository.$deleteUnusedSockets(node.pub_key, addresses);
+
+      const oldRecordTypes = await NodeRecordsRepository.$getRecordTypes(node.pub_key);
+      const customRecordTypes: number[] = [];
+      for (const [type, payload] of Object.entries(node.custom_records || {})) {
+        const numericalType = parseInt(type);
+        await NodeRecordsRepository.$saveRecord({
+          publicKey: node.pub_key,
+          type: numericalType,
+          payload,
+        });
+        customRecordTypes.push(numericalType);
       }
-    logger.info(`${progress} nodes updated. ${deletedSockets} sockets deleted`);
+      if (oldRecordTypes.reduce((changed, type) => changed || customRecordTypes.indexOf(type) === -1, false)) {
+        deletedRecords += await NodeRecordsRepository.$deleteUnusedRecords(node.pub_key, customRecordTypes);
+      }
+    }
+    logger.info(`${progress} nodes updated. ${deletedSockets} sockets deleted. ${deletedRecords} custom records deleted.`);
 
     // If a channel if not present in the graph, mark it as inactive
     await nodesApi.$setNodesInactive(graphNodesPubkeys);