fetch accurate fee rates from Cake's mempool api (#1649)

* fetch accurate fee rates from mempool api

* remove duplicate exception handler onError call [skip ci]

* add the domain name

lib/entities/preferences_key.dart

@@ -61,6 +61,7 @@ class PreferencesKey {
   static const useEtherscan = 'use_etherscan';
   static const usePolygonScan = 'use_polygonscan';
   static const useTronGrid = 'use_trongrid';
+  static const useMempoolFeeAPI = 'use_mempool_fee_api';
   static const defaultNanoRep = 'default_nano_representative';
   static const defaultBananoRep = 'default_banano_representative';
   static const lookupsTwitter = 'looks_up_twitter';

lib/src/screens/settings/privacy_page.dart

@@ -6,7 +6,9 @@ import 'package:cake_wallet/src/screens/base_page.dart';
 import 'package:cake_wallet/src/screens/settings/widgets/settings_cell_with_arrow.dart';
 import 'package:cake_wallet/src/screens/settings/widgets/settings_choices_cell.dart';
 import 'package:cake_wallet/src/screens/settings/widgets/settings_switcher_cell.dart';
+import 'package:cake_wallet/src/widgets/alert_with_two_actions.dart';
 import 'package:cake_wallet/utils/device_info.dart';
+import 'package:cake_wallet/utils/show_pop_up.dart';
 import 'package:cake_wallet/view_model/settings/choices_list_item.dart';
 import 'package:cake_wallet/view_model/settings/privacy_settings_view_model.dart';
 import 'package:flutter/material.dart';
@@ -111,6 +113,33 @@ class PrivacyPage extends BasePage {
                     _privacySettingsViewModel.setUseTronGrid(value);
                   },
                 ),
+              if (_privacySettingsViewModel.canUseMempoolFeeAPI)
+                SettingsSwitcherCell(
+                  title: S.current.live_fee_rates,
+                  value: _privacySettingsViewModel.useMempoolFeeAPI,
+                  onValueChange: (BuildContext _, bool isEnabled) async {
+                    if (!isEnabled) {
+                      final bool confirmation = await showPopUp<bool>(
+                          context: context,
+                          builder: (BuildContext context) {
+                            return AlertWithTwoActions(
+                                alertTitle: S.of(context).warning,
+                                alertContent: S.of(context).disable_fee_api_warning,
+                                rightButtonText: S.of(context).confirm,
+                                leftButtonText: S.of(context).cancel,
+                                actionRightButton: () => Navigator.of(context).pop(true),
+                                actionLeftButton: () => Navigator.of(context).pop(false));
+                          }) ??
+                          false;
+                      if (confirmation) {
+                        _privacySettingsViewModel.setUseMempoolFeeAPI(isEnabled);
+                      }
+                      return;
+                    }
+
+                    _privacySettingsViewModel.setUseMempoolFeeAPI(isEnabled);
+                  },
+                ),
               SettingsCellWithArrow(
                 title: S.current.domain_looks_up,
                 handler: (context) => Navigator.of(context).pushNamed(Routes.domainLookupsPage),

lib/store/settings_store.dart

@@ -101,6 +101,7 @@ abstract class SettingsStoreBase with Store {
       required this.useEtherscan,
       required this.usePolygonScan,
       required this.useTronGrid,
+      required this.useMempoolFeeAPI,
       required this.defaultNanoRep,
       required this.defaultBananoRep,
       required this.lookupsTwitter,
@@ -416,6 +417,9 @@ abstract class SettingsStoreBase with Store {
     reaction((_) => useTronGrid,
         (bool useTronGrid) => _sharedPreferences.setBool(PreferencesKey.useTronGrid, useTronGrid));
 
+    reaction((_) => useMempoolFeeAPI,
+        (bool useMempoolFeeAPI) => _sharedPreferences.setBool(PreferencesKey.useMempoolFeeAPI, useMempoolFeeAPI));
+
     reaction((_) => defaultNanoRep,
         (String nanoRep) => _sharedPreferences.setString(PreferencesKey.defaultNanoRep, nanoRep));
 
@@ -707,6 +711,9 @@ abstract class SettingsStoreBase with Store {
   @observable
   bool useTronGrid;
 
+  @observable
+  bool useMempoolFeeAPI;
+
   @observable
   String defaultNanoRep;
 
@@ -892,6 +899,7 @@ abstract class SettingsStoreBase with Store {
     final useEtherscan = sharedPreferences.getBool(PreferencesKey.useEtherscan) ?? true;
     final usePolygonScan = sharedPreferences.getBool(PreferencesKey.usePolygonScan) ?? true;
     final useTronGrid = sharedPreferences.getBool(PreferencesKey.useTronGrid) ?? true;
+    final useMempoolFeeAPI = sharedPreferences.getBool(PreferencesKey.useMempoolFeeAPI) ?? true;
     final defaultNanoRep = sharedPreferences.getString(PreferencesKey.defaultNanoRep) ?? "";
     final defaultBananoRep = sharedPreferences.getString(PreferencesKey.defaultBananoRep) ?? "";
     final lookupsTwitter = sharedPreferences.getBool(PreferencesKey.lookupsTwitter) ?? true;
@@ -1154,6 +1162,7 @@ abstract class SettingsStoreBase with Store {
       useEtherscan: useEtherscan,
       usePolygonScan: usePolygonScan,
       useTronGrid: useTronGrid,
+      useMempoolFeeAPI: useMempoolFeeAPI,
       defaultNanoRep: defaultNanoRep,
       defaultBananoRep: defaultBananoRep,
       lookupsTwitter: lookupsTwitter,
@@ -1307,6 +1316,7 @@ abstract class SettingsStoreBase with Store {
     useEtherscan = sharedPreferences.getBool(PreferencesKey.useEtherscan) ?? true;
     usePolygonScan = sharedPreferences.getBool(PreferencesKey.usePolygonScan) ?? true;
     useTronGrid = sharedPreferences.getBool(PreferencesKey.useTronGrid) ?? true;
+    useMempoolFeeAPI = sharedPreferences.getBool(PreferencesKey.useMempoolFeeAPI) ?? true;
     defaultNanoRep = sharedPreferences.getString(PreferencesKey.defaultNanoRep) ?? "";
     defaultBananoRep = sharedPreferences.getString(PreferencesKey.defaultBananoRep) ?? "";
     lookupsTwitter = sharedPreferences.getBool(PreferencesKey.lookupsTwitter) ?? true;

lib/utils/exception_handler.dart

@@ -174,6 +174,13 @@ class ExceptionHandler {
     "ClientException: Write failed, uri=http",
     "Connection terminated during handshake",
     "Corrupted wallets seeds",
+    "bad_alloc",
+    "does not correspond",
+    "basic_string",
+    "input_stream",
+    "input stream error",
+    "invalid signature",
+    "invalid password",
   ];
 
   static Future<void> _addDeviceInfo(File file) async {

lib/view_model/settings/privacy_settings_view_model.dart

@@ -1,3 +1,4 @@
+import 'package:cake_wallet/bitcoin/bitcoin.dart';
 import 'package:cake_wallet/entities/auto_generate_subaddress_status.dart';
 import 'package:cake_wallet/entities/exchange_api_mode.dart';
 import 'package:cake_wallet/ethereum/ethereum.dart';
@@ -75,6 +76,9 @@ abstract class PrivacySettingsViewModelBase with Store {
   @computed
   bool get useTronGrid => _settingsStore.useTronGrid;
 
+  @computed
+  bool get useMempoolFeeAPI => _settingsStore.useMempoolFeeAPI;
+
   @computed
   bool get lookupTwitter => _settingsStore.lookupsTwitter;
 
@@ -99,6 +103,8 @@ abstract class PrivacySettingsViewModelBase with Store {
 
   bool get canUseTronGrid => _wallet.type == WalletType.tron;
 
+  bool get canUseMempoolFeeAPI => _wallet.type == WalletType.bitcoin;
+
   @action
   void setShouldSaveRecipientAddress(bool value) =>
       _settingsStore.shouldSaveRecipientAddress = value;
@@ -156,4 +162,9 @@ abstract class PrivacySettingsViewModelBase with Store {
     _settingsStore.useTronGrid = value;
     tron!.updateTronGridUsageState(_wallet, value);
   }
+
+  @action
+  void setUseMempoolFeeAPI(bool value) {
+    _settingsStore.useMempoolFeeAPI = value;
+  }
 }