Bump fee with mempool information

backend/controllers/shared/RTLConf.js

@@ -14,6 +14,54 @@ const logger = Logger;
 const common = Common;
 const wsServer = WSServer;
 const databaseService = Database;
+// Set local block explorer URL after first API call
+// if the selected node block explorer has working REST API suite
+// otherwise set it to mempool.space
+let blockExplorerUrl = '';
+export const getExplorerFeesRecommended = (req, res, next) => {
+    logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Getting Recommended Fee Rates..' });
+    options.url = (blockExplorerUrl === '') ?
+        req.session.selectedNode.settings.blockExplorerUrl + '/api/v1/fees/recommended' :
+        blockExplorerUrl + '/api/v1/fees/recommended';
+    request(options).then((body) => {
+        blockExplorerUrl = req.session.selectedNode.settings.blockExplorerUrl;
+        logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Recommended Fee Rates Received', data: body });
+        res.status(200).json(JSON.parse(body));
+    }).catch((errRes) => {
+        blockExplorerUrl = 'https://mempool.space';
+        options.url = blockExplorerUrl + '/api/v1/fees/recommended';
+        return request(options).then((body) => {
+            logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Recommended Fee Rates Received', data: body });
+            res.status(200).json(JSON.parse(body));
+        }).catch((errRes) => {
+            const errMsg = 'Get Recommended Fee Rates Error';
+            const err = common.handleError({ statusCode: 500, message: errMsg, error: errRes }, 'RTLConf', errMsg, req.session.selectedNode);
+            return res.status(err.statusCode).json({ message: err.error, error: err.error });
+        });
+    });
+};
+export const getExplorerTransaction = (req, res, next) => {
+    logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Getting Transaction From Block Explorer..' });
+    options.url = (blockExplorerUrl === '') ?
+        req.session.selectedNode.settings.blockExplorerUrl + '/api/tx/' + req.params.txid :
+        blockExplorerUrl + '/api/tx/' + req.params.txid;
+    request(options).then((body) => {
+        blockExplorerUrl = req.session.selectedNode.settings.blockExplorerUrl;
+        logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Transaction From Block Explorer Received', data: body });
+        res.status(200).json(JSON.parse(body));
+    }).catch((errRes) => {
+        blockExplorerUrl = 'https://mempool.space';
+        options.url = blockExplorerUrl + '/api/tx/' + req.params.txid;
+        return request(options).then((body) => {
+            logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Transaction From Block Explorer Received', data: body });
+            res.status(200).json(JSON.parse(body));
+        }).catch((errRes) => {
+            const errMsg = 'Get Transaction From Block Explorer Error';
+            const err = common.handleError({ statusCode: 500, message: errMsg, error: errRes }, 'RTLConf', errMsg, req.session.selectedNode);
+            return res.status(err.statusCode).json({ message: err.error, error: err.error });
+        });
+    });
+};
 export const getCurrencyRates = (req, res, next) => {
     logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Getting Currency Rates..' });
     options.url = 'https://blockchain.info/ticker';
@@ -99,6 +147,7 @@ export const updateSelectedNode = (req, res, next) => {
             databaseService.loadDatabase(req.session);
         }
     }
+    blockExplorerUrl = '';
     logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Selected Node Updated To ' + req.session.selectedNode.lnNode || '' });
     res.status(200).json(common.removeAuthSecureData(JSON.parse(JSON.stringify(req.session.selectedNode))));
 };

backend/routes/shared/RTLConf.js

@@ -1,7 +1,7 @@
 import exprs from 'express';
 const { Router } = exprs;
 import { isAuthenticated } from '../../utils/authCheck.js';
-import { updateNodeSettings, getConfig, getFile, updateSelectedNode, updateApplicationSettings, getCurrencyRates, getApplicationSettings } from '../../controllers/shared/RTLConf.js';
+import { updateNodeSettings, getConfig, getFile, updateSelectedNode, updateApplicationSettings, getCurrencyRates, getApplicationSettings, getExplorerFeesRecommended, getExplorerTransaction } from '../../controllers/shared/RTLConf.js';
 const router = Router();
 router.get('/', getApplicationSettings);
 router.get('/rates', getCurrencyRates);
@@ -10,4 +10,6 @@ router.get('/updateSelNode/:currNodeIndex/:prevNodeIndex', updateSelectedNode);
 router.get('/config/:nodeType', isAuthenticated, getConfig);
 router.post('/node', isAuthenticated, updateNodeSettings);
 router.post('/application', isAuthenticated, updateApplicationSettings);
+router.get('/explorerFeesRecommended', getExplorerFeesRecommended);
+router.get('/explorerTransaction/:txid', getExplorerTransaction);
 export default router;

server/controllers/shared/RTLConf.ts

@@ -15,6 +15,56 @@ const logger: LoggerService = Logger;
 const common: CommonService = Common;
 const wsServer = WSServer;
 const databaseService: DatabaseService = Database;
+// Set local block explorer URL after first API call
+// if the selected node block explorer has working REST API suite
+// otherwise set it to mempool.space
+let blockExplorerUrl = '';
+
+export const getExplorerFeesRecommended = (req, res, next) => {
+  logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Getting Recommended Fee Rates..' });
+  options.url = (blockExplorerUrl === '') ?
+    req.session.selectedNode.settings.blockExplorerUrl + '/api/v1/fees/recommended' :
+    blockExplorerUrl + '/api/v1/fees/recommended';
+  request(options).then((body) => {
+    blockExplorerUrl = req.session.selectedNode.settings.blockExplorerUrl;
+    logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Recommended Fee Rates Received', data: body });
+    res.status(200).json(JSON.parse(body));
+  }).catch((errRes) => {
+    blockExplorerUrl = 'https://mempool.space';
+    options.url = blockExplorerUrl + '/api/v1/fees/recommended';
+    return request(options).then((body) => {
+      logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Recommended Fee Rates Received', data: body });
+      res.status(200).json(JSON.parse(body));
+    }).catch((errRes) => {
+      const errMsg = 'Get Recommended Fee Rates Error';
+      const err = common.handleError({ statusCode: 500, message: errMsg, error: errRes }, 'RTLConf', errMsg, req.session.selectedNode);
+      return res.status(err.statusCode).json({ message: err.error, error: err.error });
+    });
+  });
+};
+
+export const getExplorerTransaction = (req, res, next) => {
+  logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Getting Transaction From Block Explorer..' });
+  options.url = (blockExplorerUrl === '') ?
+    req.session.selectedNode.settings.blockExplorerUrl + '/api/tx/' + req.params.txid :
+    blockExplorerUrl + '/api/tx/' + req.params.txid;
+  request(options).then((body) => {
+    blockExplorerUrl = req.session.selectedNode.settings.blockExplorerUrl;
+    logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Transaction From Block Explorer Received', data: body });
+    res.status(200).json(JSON.parse(body));
+  }).catch((errRes) => {
+    blockExplorerUrl = 'https://mempool.space';
+    options.url = blockExplorerUrl + '/api/tx/' + req.params.txid;
+    return request(options).then((body) => {
+      logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Transaction From Block Explorer Received', data: body });
+      res.status(200).json(JSON.parse(body));
+    }).catch((errRes) => {
+      const errMsg = 'Get Transaction From Block Explorer Error';
+      const err = common.handleError({ statusCode: 500, message: errMsg, error: errRes }, 'RTLConf', errMsg, req.session.selectedNode);
+      return res.status(err.statusCode).json({ message: err.error, error: err.error });
+    });
+  });
+};
 
 export const getCurrencyRates = (req, res, next) => {
   logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Getting Currency Rates..' });
@@ -100,6 +150,7 @@ export const updateSelectedNode = (req, res, next) => {
       databaseService.loadDatabase(req.session);
     }
   }
+  blockExplorerUrl = '';
   logger.log({ selectedNode: req.session.selectedNode, level: 'INFO', fileName: 'RTLConf', msg: 'Selected Node Updated To ' + req.session.selectedNode.lnNode || '' });
   res.status(200).json(common.removeAuthSecureData(JSON.parse(JSON.stringify(req.session.selectedNode))));
 };

server/routes/shared/RTLConf.ts

@@ -1,7 +1,8 @@
 import exprs from 'express';
 const { Router } = exprs;
 import { isAuthenticated } from '../../utils/authCheck.js';
-import { updateNodeSettings, getConfig, getFile, updateSelectedNode, updateApplicationSettings, getCurrencyRates, getApplicationSettings } from '../../controllers/shared/RTLConf.js';
+import { updateNodeSettings, getConfig, getFile, updateSelectedNode, updateApplicationSettings, getCurrencyRates, getApplicationSettings,
+  getExplorerFeesRecommended, getExplorerTransaction } from '../../controllers/shared/RTLConf.js';
 
 const router = Router();
 
@@ -12,5 +13,7 @@ router.get('/updateSelNode/:currNodeIndex/:prevNodeIndex', updateSelectedNode);
 router.get('/config/:nodeType', isAuthenticated, getConfig);
 router.post('/node', isAuthenticated, updateNodeSettings);
 router.post('/application', isAuthenticated, updateApplicationSettings);
+router.get('/explorerFeesRecommended', getExplorerFeesRecommended);
+router.get('/explorerTransaction/:txid', getExplorerTransaction);
 
 export default router;

src/app/cln/peers-channels/channels/bump-fee-modal/bump-fee.component.html

@@ -15,15 +15,17 @@
             <div fxLayout="column" fxFlex="100" fxLayoutAlign="space-between stretch">
               <div fxFlex="100" class="alert alert-info">
                 <fa-icon class="mr-1 alert-icon" [icon]="faInfoCircle" />
-                <span fxLayout="column" fxFlex="100">Bumping fee on pending open channels is an advanced feature, attempt it only if you are familiar with the functionality of Bitcoin transactions.
-                  <div>Before attempting fee bump ensure the following:</div>
-                  <div class="pl-1">1: Use a Bitcoin block explorer to ensure that channel opening transaction is not confirmed.</div>
-                  <div class="pl-1">2: The channel opening transaction must have a sizable change output, which can be spent further. The fee cannot be bumped without the change output.</div>
-                  <div class="pl-1">3: Find the index value of the change output via a block explorer.</div>
-                  <div class="pl-1">4: Enter the index value of the change output in the form below and the desired fee rate.</div>
-                  <div class="pl-1">5: Upon successful fee bump, use your block explorer to track the child transaction in the mempool, which should be linked with the change output transaction.</div>
+                <span fxLayout="column" fxFlex="100">
+                  <div>Fee rates recommended by mempool.space (sat/vByte):</div>
+                  <div>- High: {{recommendedFee.fastestFee || 'Unknown'}}</div>
+                  <div>- Medium: {{recommendedFee.halfHourFee || 'Unknown'}}</div>
+                  <div>- Low: {{recommendedFee.hourFee || 'Unknown'}}</div>
                 </span>
               </div>
+              <div *ngIf="flgShowDustWarning" fxFlex="100" class="alert alert-warn">
+                <fa-icon class="mr-1 alert-icon" [icon]="faExclamationTriangle" />
+                <span>Change output balance <strong>{{dustOutputValue | number}}</strong> (Sats) may be insufficient for fee bumping, depending on the prevailing fee rates.</span>
+              </div>
               <div fxLayout="row" fxFlex="100" fxLayoutAlign="space-between center">
                 <mat-form-field fxLayout="column" fxFlex="49">
                   <mat-label>Output Index</mat-label>