fix error when navigating to huge transactions

frontend/src/app/components/transaction/transaction-preview.component.ts

@@ -117,8 +117,9 @@ export class TransactionPreviewComponent implements OnInit, OnDestroy {
         }),
         switchMap(() => {
           let transactionObservable$: Observable<Transaction>;
-          if (history.state.data && history.state.data.fee !== -1) {
+          const cached = this.stateService.getTxFromCache(this.txId);
-            transactionObservable$ = of(history.state.data);
+          if (cached && cached.fee !== -1) {
+            transactionObservable$ = of(cached);
           } else {
             transactionObservable$ = this.electrsApiService
               .getTransaction$(this.txId)

frontend/src/app/components/transaction/transaction.component.html

@@ -3,7 +3,7 @@
   <div class="title-block">
     <div *ngIf="rbfTransaction" class="alert alert-mempool" role="alert">
       <span i18n="transaction.rbf.replacement|RBF replacement">This transaction has been replaced by:</span>
-      <a class="alert-link" [routerLink]="['/tx/' | relativeUrl, rbfTransaction.txid]" [state]="{ data: rbfTransaction.size ? rbfTransaction : null }">
+      <a class="alert-link" [routerLink]="['/tx/' | relativeUrl, rbfTransaction.txid]">
         <span class="d-inline d-lg-none">{{ rbfTransaction.txid | shortenString : 24 }}</span>
         <span class="d-none d-lg-inline">{{ rbfTransaction.txid }}</span>
       </a>

frontend/src/app/components/transaction/transaction.component.ts

@@ -183,8 +183,9 @@ export class TransactionComponent implements OnInit, AfterViewInit, OnDestroy {
         }),
         switchMap(() => {
           let transactionObservable$: Observable<Transaction>;
-          if (history.state.data && history.state.data.fee !== -1) {
+          const cached = this.stateService.getTxFromCache(this.txId);
-            transactionObservable$ = of(history.state.data);
+          if (cached && cached.fee !== -1) {
+            transactionObservable$ = of(cached);
           } else {
             transactionObservable$ = this.electrsApiService
               .getTransaction$(this.txId)
@@ -279,6 +280,7 @@ export class TransactionComponent implements OnInit, AfterViewInit, OnDestroy {
         this.waitingForTransaction = false;
       }
       this.rbfTransaction = rbfTransaction;
+      this.stateService.setTxCache([this.rbfTransaction]);
     });
 
     this.queryParamsSubscription = this.route.queryParams.subscribe((params) => {

frontend/src/app/components/transactions-list/transactions-list.component.html

@@ -1,6 +1,6 @@
 <ng-container *ngFor="let tx of transactions; let i = index; trackBy: trackByFn">
   <div *ngIf="!transactionPage" class="header-bg box tx-page-container">
-    <a class="float-left" [routerLink]="['/tx/' | relativeUrl, tx.txid]" [state]="{ data: tx }">
+    <a class="float-left" [routerLink]="['/tx/' | relativeUrl, tx.txid]">
       <span style="float: left;" class="d-block d-md-none">{{ tx.txid | shortenString : 16 }}</span>
       <span style="float: left;" class="d-none d-md-block">{{ tx.txid }}</span>
     </a>

frontend/src/app/components/transactions-list/transactions-list.component.ts

@@ -119,7 +119,7 @@ export class TransactionsListComponent implements OnInit, OnChanges {
       }
 
       this.transactionsLength = this.transactions.length;
-
+      this.stateService.setTxCache(this.transactions);
 
       this.transactions.forEach((tx) => {
         tx['@voutLimit'] = true;

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

@@ -112,6 +112,8 @@ export class StateService {
   timeLtr: BehaviorSubject<boolean>;
   hideFlow: BehaviorSubject<boolean>;
 
+  txCache: { [txid: string]: Transaction } = {};
+
   constructor(
     @Inject(PLATFORM_ID) private platformId: any,
     @Inject(LOCALE_ID) private locale: string,
@@ -265,4 +267,19 @@ export class StateService {
   isLiquid() {
     return this.network === 'liquid' || this.network === 'liquidtestnet';
   }
+
+  setTxCache(transactions) {
+    this.txCache = {};
+    transactions.forEach(tx => {
+      this.txCache[tx.txid] = tx;
+    });
+  }
+ 
+  getTxFromCache(txid) {
+    if (this.txCache && this.txCache[txid]) {
+      return this.txCache[txid];
+    } else {
+      return null;
+    }
+  }
 }