Remove frontend fee calculation and read it from the websocket instead

backend/src/api/websocket-handler.ts

@@ -13,6 +13,7 @@ import config from '../config';
 import transactionUtils from './transaction-utils';
 import rbfCache from './rbf-cache';
 import difficultyAdjustment from './difficulty-adjustment';
+import feeApi from './fee-api';
 
 class WebsocketHandler {
   private wss: WebSocket.Server | undefined;
@@ -236,6 +237,7 @@ class WebsocketHandler {
     const rbfTransactions = Common.findRbfTransactions(newTransactions, deletedTransactions);
     const da = difficultyAdjustment.getDifficultyAdjustment();
     memPool.handleRbfTransactions(rbfTransactions);
+    const recommendedFees = feeApi.getRecommendedFee();
 
     this.wss.clients.forEach(async (client: WebSocket) => {
       if (client.readyState !== WebSocket.OPEN) {
@@ -249,6 +251,7 @@ class WebsocketHandler {
         response['vBytesPerSecond'] = vBytesPerSecond;
         response['transactions'] = newTransactions.slice(0, 6).map((tx) => Common.stripTransaction(tx));
         response['da'] = da;
+        response['fees'] = recommendedFees;
       }
 
       if (client['want-mempool-blocks']) {
@@ -413,6 +416,7 @@ class WebsocketHandler {
         'block': block,
         'mempoolInfo': memPool.getMempoolInfo(),
         'da': difficultyAdjustment.getDifficultyAdjustment(),
+        'fees': feeApi.getRecommendedFee(),
       };
 
       if (mBlocks && client['want-mempool-blocks']) {

frontend/src/app/components/fees-box/fees-box.component.html

@@ -1,21 +1,21 @@
 <div class="fee-estimation-wrapper">
-  <div class="fee-estimation-container" *ngIf="(isLoadingWebSocket$ | async) === false && (feeEstimations$ | async) as feeEstimations; else loadingFees">
+  <div class="fee-estimation-container" *ngIf="(isLoadingWebSocket$ | async) === false && (recommendedFees$ | async) as recommendedFees; else loadingFees">
     <div class="item">
       <h5 class="card-title" i18n="fees-box.low-priority">Low priority</h5>
       <div class="card-text" i18n-ngbTooltip="Transaction fee tooltip" ngbTooltip="Based on average native segwit transaction of 140 vBytes" placement="bottom">
-        <div class="fee-text">{{ feeEstimations.hourFee }} <span i18n="shared.sat-vbyte|sat/vB">sat/vB</span></div> <span class="fiat"><app-fiat [value]="feeEstimations.hourFee * 140" ></app-fiat></span>
+        <div class="fee-text">{{ recommendedFees.hourFee }} <span i18n="shared.sat-vbyte|sat/vB">sat/vB</span></div> <span class="fiat"><app-fiat [value]="recommendedFees.hourFee * 140" ></app-fiat></span>
       </div>
     </div>
     <div class="item">
       <h5 class="card-title" i18n="fees-box.medium-priority">Medium priority</h5>
       <div class="card-text" i18n-ngbTooltip="Transaction fee tooltip" ngbTooltip="Based on average native segwit transaction of 140 vBytes" placement="bottom">
-        <div class="fee-text">{{ feeEstimations.halfHourFee }} <span i18n="shared.sat-vbyte|sat/vB">sat/vB</span></div> <span class="fiat"><app-fiat [value]="feeEstimations.halfHourFee * 140" ></app-fiat></span>
+        <div class="fee-text">{{ recommendedFees.halfHourFee }} <span i18n="shared.sat-vbyte|sat/vB">sat/vB</span></div> <span class="fiat"><app-fiat [value]="recommendedFees.halfHourFee * 140" ></app-fiat></span>
       </div>
     </div>
     <div class="item">
       <h5 class="card-title" i18n="fees-box.high-priority">High priority</h5>
       <div class="card-text" i18n-ngbTooltip="Transaction fee tooltip" ngbTooltip="Based on average native segwit transaction of 140 vBytes" placement="bottom">
-        <div class="fee-text">{{ feeEstimations.fastestFee }} <span i18n="shared.sat-vbyte|sat/vB">sat/vB</span></div> <span class="fiat"><app-fiat [value]="feeEstimations.fastestFee * 140" ></app-fiat></span>
+        <div class="fee-text">{{ recommendedFees.fastestFee }} <span i18n="shared.sat-vbyte|sat/vB">sat/vB</span></div> <span class="fiat"><app-fiat [value]="recommendedFees.fastestFee * 140" ></app-fiat></span>
       </div>
     </div>
   </div>

frontend/src/app/components/fees-box/fees-box.component.ts

@@ -1,8 +1,8 @@
 import { Component, OnInit, ChangeDetectionStrategy } from '@angular/core';
 import { StateService } from 'src/app/services/state.service';
-import { map, filter } from 'rxjs/operators';
+import { map, filter, tap } from 'rxjs/operators';
 import { merge, Observable } from 'rxjs';
-import { MempoolBlock } from 'src/app/interfaces/websocket.interface';
+import { MempoolBlock, Recommendedfees } from 'src/app/interfaces/websocket.interface';
 
 interface FeeEstimations {
   fastestFee: number;
@@ -17,8 +17,8 @@ interface FeeEstimations {
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class FeesBoxComponent implements OnInit {
-  feeEstimations$: Observable<FeeEstimations>;
   isLoadingWebSocket$: Observable<boolean>;
+  recommendedFees$: Observable<Recommendedfees>;
   defaultFee: number;
 
   constructor(
@@ -29,40 +29,6 @@ export class FeesBoxComponent implements OnInit {
     this.defaultFee = this.stateService.network === 'liquid' || this.stateService.network === 'liquidtestnet' ? 0.1 : 1;
 
     this.isLoadingWebSocket$ = this.stateService.isLoadingWebSocket$;
-    this.feeEstimations$ = this.stateService.mempoolBlocks$
+    this.recommendedFees$ = this.stateService.recommendedFees$;
-      .pipe(
-        map((pBlocks) => {
-          if (!pBlocks.length) {
-            return {
-              'fastestFee': this.defaultFee,
-              'halfHourFee': this.defaultFee,
-              'hourFee': this.defaultFee,
-            };
-          }
-
-          const firstMedianFee = this.optimizeMedianFee(pBlocks[0], pBlocks[1]);
-          const secondMedianFee = pBlocks[1] ? this.optimizeMedianFee(pBlocks[1], pBlocks[2], firstMedianFee) : this.defaultFee;
-          const thirdMedianFee = pBlocks[2] ? this.optimizeMedianFee(pBlocks[2], pBlocks[3], secondMedianFee) : this.defaultFee;
-
-          return {
-            'fastestFee': firstMedianFee,
-            'halfHourFee': secondMedianFee,
-            'hourFee': thirdMedianFee,
-          };
-        })
-      );
   }
-
-  private optimizeMedianFee(pBlock: MempoolBlock, nextBlock: MempoolBlock | undefined, previousFee?: number): number {
-    const useFee = previousFee ? (pBlock.medianFee + previousFee) / 2 : pBlock.medianFee;
-    if (pBlock.blockVSize <= 500000) {
-      return this.defaultFee;
-    }
-    if (pBlock.blockVSize <= 950000 && !nextBlock) {
-      const multiplier = (pBlock.blockVSize - 500000) / 500000;
-      return Math.max(Math.round(useFee * multiplier), this.defaultFee);
-    }
-    return Math.ceil(useFee);
-  }
-
 }

frontend/src/app/interfaces/websocket.interface.ts

@@ -21,6 +21,7 @@ export interface WebsocketResponse {
   loadingIndicators?: ILoadingIndicators;
   backendInfo?: IBackendInfo;
   da?: DifficultyAdjustment;
+  fees?: Recommendedfees;
   'track-tx'?: string;
   'track-address'?: string;
   'track-asset'?: string;
@@ -65,3 +66,11 @@ export interface IBackendInfo {
   gitCommit: string;
   version: string;
 }
+
+export interface Recommendedfees {
+  fastestFee: number;
+  halfHourFee: number;
+  hourFee: number;
+  minimumFee: number;
+  economyFee: number;
+}

frontend/src/app/services/state.service.ts

@@ -1,7 +1,7 @@
 import { Inject, Injectable, PLATFORM_ID } from '@angular/core';
 import { ReplaySubject, BehaviorSubject, Subject, fromEvent, Observable } from 'rxjs';
 import { Transaction } from '../interfaces/electrs.interface';
-import { IBackendInfo, MempoolBlock, MempoolInfo, ReplacedTransaction, TransactionStripped } from '../interfaces/websocket.interface';
+import { IBackendInfo, MempoolBlock, MempoolInfo, Recommendedfees, ReplacedTransaction, TransactionStripped } from '../interfaces/websocket.interface';
 import { BlockExtended, DifficultyAdjustment, OptimizedMempoolStats } from '../interfaces/node-api.interface';
 import { Router, NavigationStart } from '@angular/router';
 import { isPlatformBrowser } from '@angular/common';
@@ -90,6 +90,7 @@ export class StateService {
   previousRetarget$ = new ReplaySubject<number>(1);
   backendInfo$ = new ReplaySubject<IBackendInfo>(1);
   loadingIndicators$ = new ReplaySubject<ILoadingIndicators>(1);
+  recommendedFees$ = new ReplaySubject<Recommendedfees>(1);
 
   live2Chart$ = new Subject<OptimizedMempoolStats>();
 

frontend/src/app/services/websocket.service.ts

@@ -263,6 +263,10 @@ export class WebsocketService {
       this.stateService.difficultyAdjustment$.next(response.da);
     }
 
+    if (response.fees) {
+     this.stateService.recommendedFees$.next(response.fees); 
+    }
+
     if (response.backendInfo) {
       this.stateService.backendInfo$.next(response.backendInfo);