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coins_bloc.dart
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import 'dart:async';
import 'package:bloc/bloc.dart';
import 'package:bloc_concurrency/bloc_concurrency.dart';
import 'package:equatable/equatable.dart';
import 'package:komodo_defi_sdk/komodo_defi_sdk.dart';
import 'package:komodo_defi_types/komodo_defi_types.dart';
import 'package:web_dex/app_config/app_config.dart';
import 'package:web_dex/bloc/coins_bloc/coins_repo.dart';
import 'package:web_dex/blocs/trezor_coins_bloc.dart';
import 'package:web_dex/mm2/mm2_api/mm2_api.dart';
import 'package:web_dex/model/cex_price.dart';
import 'package:web_dex/model/coin.dart';
import 'package:web_dex/model/kdf_auth_metadata_extension.dart';
import 'package:web_dex/model/wallet.dart';
import 'package:web_dex/shared/utils/utils.dart';
part 'coins_event.dart';
part 'coins_state.dart';
/// Responsible for coin activation, deactivation, syncing, and fiat price
class CoinsBloc extends Bloc<CoinsEvent, CoinsState> {
CoinsBloc(
this._kdfSdk,
this._coinsRepo,
this._trezorBloc,
this._mm2Api,
) : super(CoinsState.initial()) {
on<CoinsStarted>(_onCoinsStarted, transformer: droppable());
// TODO: move auth listener to ui layer: bloclistener fires auth events
on<CoinsBalanceMonitoringStarted>(_onCoinsBalanceMonitoringStarted);
on<CoinsBalanceMonitoringStopped>(_onCoinsBalanceMonitoringStopped);
on<CoinsBalancesRefreshed>(_onCoinsRefreshed, transformer: droppable());
on<CoinsActivated>(_onCoinsActivated, transformer: concurrent());
on<CoinsDeactivated>(_onCoinsDeactivated, transformer: concurrent());
on<CoinsPricesUpdated>(_onPricesUpdated, transformer: droppable());
on<CoinsSessionStarted>(_onLogin, transformer: droppable());
on<CoinsSessionEnded>(_onLogout, transformer: droppable());
on<CoinsSuspendedReactivated>(
_onReactivateSuspended,
transformer: droppable(),
);
on<CoinsWalletCoinUpdated>(_onWalletCoinUpdated, transformer: sequential());
on<CoinsPubkeysRequested>(
_onCoinsPubkeysRequested,
transformer: concurrent(),
);
}
final KomodoDefiSdk _kdfSdk;
final CoinsRepo _coinsRepo;
final Mm2Api _mm2Api;
// TODO: refactor to use repository - pin/password input events need to be
// handled, which are currently done through the trezor "bloc"
final TrezorCoinsBloc _trezorBloc;
StreamSubscription<Coin>? _enabledCoinsSubscription;
Timer? _updateBalancesTimer;
Timer? _updatePricesTimer;
Timer? _reActivateSuspendedTimer;
// prevents RPC spamming on startup & previous inconsistencies with sdk wallet
KdfUser? _currentUserCache;
@override
Future<void> close() async {
await _enabledCoinsSubscription?.cancel();
_updateBalancesTimer?.cancel();
_updatePricesTimer?.cancel();
_reActivateSuspendedTimer?.cancel();
await super.close();
}
Future<void> _onCoinsPubkeysRequested(
CoinsPubkeysRequested event,
Emitter<CoinsState> emit,
) async {
try {
// Get current coin
final coin = state.coins[event.coinId];
if (coin == null) return;
// Get pubkeys from the SDK through the repo
final asset = _kdfSdk.assets.assetsFromTicker(event.coinId).single;
final pubkeys = await _kdfSdk.pubkeys.getPubkeys(asset);
// Update state with new pubkeys
emit(
state.copyWith(
pubkeys: {
...state.pubkeys,
event.coinId: pubkeys,
},
),
);
} catch (e, s) {
log(
'Failed to get pubkeys for ${event.coinId}: $e',
isError: true,
path: 'coins_bloc => _onCoinsPubkeysRequested',
trace: s,
).ignore();
}
}
Future<void> _onCoinsStarted(
CoinsStarted event,
Emitter<CoinsState> emit,
) async {
emit(state.copyWith(coins: _coinsRepo.getKnownCoinsMap()));
add(CoinsPricesUpdated());
_updatePricesTimer?.cancel();
_updatePricesTimer = Timer.periodic(
const Duration(minutes: 1),
(_) => add(CoinsPricesUpdated()),
);
}
Future<void> _onCoinsRefreshed(
CoinsBalancesRefreshed event,
Emitter<CoinsState> emit,
) async {
_currentUserCache ??= await _kdfSdk.auth.currentUser;
switch (_currentUserCache?.wallet.config.type) {
case WalletType.trezor:
final walletCoins =
await _coinsRepo.updateTrezorBalances(state.walletCoins);
emit(
state.copyWith(
walletCoins: walletCoins,
// update balances in all coins list as well
coins: {...state.coins, ...walletCoins},
),
);
case WalletType.metamask:
case WalletType.keplr:
case WalletType.iguana:
case WalletType.hdwallet:
case null:
final coinUpdateStream =
_coinsRepo.updateIguanaBalances(state.walletCoins);
await emit.forEach(
coinUpdateStream,
onData: (Coin coin) => state.copyWith(
walletCoins: {...state.walletCoins, coin.abbr: coin},
coins: {...state.coins, coin.abbr: coin},
),
);
}
}
Future<void> _onWalletCoinUpdated(
CoinsWalletCoinUpdated event,
Emitter<CoinsState> emit,
) async {
final coin = event.coin;
final walletCoins = Map<String, Coin>.of(state.walletCoins);
if (coin.isActivating || coin.isActive || coin.isSuspended) {
await _kdfSdk.addActivatedCoins([coin.abbr]);
emit(
state.copyWith(
walletCoins: {...walletCoins, coin.abbr: coin},
coins: {...state.coins, coin.abbr: coin},
),
);
}
if (coin.isInactive) {
walletCoins.remove(coin.abbr);
await _kdfSdk.removeActivatedCoins([coin.abbr]);
emit(
state.copyWith(
walletCoins: walletCoins,
coins: {...state.coins, coin.abbr: coin},
),
);
}
}
Future<void> _onCoinsBalanceMonitoringStopped(
CoinsBalanceMonitoringStopped event,
Emitter<CoinsState> emit,
) async {
_updateBalancesTimer?.cancel();
_reActivateSuspendedTimer?.cancel();
await _enabledCoinsSubscription?.cancel();
}
Future<void> _onCoinsBalanceMonitoringStarted(
CoinsBalanceMonitoringStarted event,
Emitter<CoinsState> emit,
) async {
_updateBalancesTimer?.cancel();
_updateBalancesTimer = Timer.periodic(
const Duration(minutes: 1),
(timer) {
add(CoinsBalancesRefreshed());
},
);
_reActivateSuspendedTimer?.cancel();
_reActivateSuspendedTimer = Timer.periodic(
const Duration(seconds: 30),
(_) => add(CoinsSuspendedReactivated()),
);
// This is used to connect [CoinsBloc] to [CoinsManagerBloc], since coins
// manager bloc activates and deactivates coins using the repository.
await _enabledCoinsSubscription?.cancel();
_enabledCoinsSubscription = _coinsRepo.enabledAssetsChanges.stream.listen(
(Coin coin) => add(CoinsWalletCoinUpdated(coin)),
);
}
Future<void> _onReactivateSuspended(
CoinsSuspendedReactivated event,
Emitter<CoinsState> emit,
) async {
await emit.forEach(
_reActivateSuspended(emit),
onData: (suspendedCoins) => state.copyWith(
walletCoins: {
...state.walletCoins,
...suspendedCoins.toMap(),
},
),
);
}
Future<void> _onCoinsActivated(
CoinsActivated event,
Emitter<CoinsState> emit,
) async {
await _activateCoins(event.coinIds, emit);
if (_currentUserCache?.wallet.config.type == WalletType.iguana ||
_currentUserCache?.wallet.config.type == WalletType.hdwallet) {
final coinUpdates = _syncIguanaCoinsStates(event.coinIds);
await emit.forEach(
coinUpdates,
onData: (coin) => state
.copyWith(walletCoins: {...state.walletCoins, coin.abbr: coin}),
);
}
}
Future<void> _onCoinsDeactivated(
CoinsDeactivated event,
Emitter<CoinsState> emit,
) async {
for (final coinId in event.coinIds) {
final coin = state.walletCoins[coinId]!;
log(
'Disabling a ${coin.name} ($coinId)',
path: 'coins_bloc => disable',
).ignore();
coin.reset();
await _kdfSdk.removeActivatedCoins([coin.abbr]);
await _mm2Api.disableCoin(coin.abbr);
final newWalletCoins = Map<String, Coin>.of(state.walletCoins)
..remove(coin.abbr);
final newCoins = Map<String, Coin>.of(state.coins);
newCoins[coin.abbr]!.state = CoinState.inactive;
emit(state.copyWith(walletCoins: newWalletCoins, coins: newCoins));
log('${coin.name} has been disabled', path: 'coins_bloc => disable')
.ignore();
}
}
Future<void> _onPricesUpdated(
CoinsPricesUpdated event,
Emitter<CoinsState> emit,
) async {
bool changed = false;
final prices = await _coinsRepo.fetchCurrentPrices();
if (prices == null) {
log(
'Coin prices list empty/null',
isError: true,
path: 'coins_bloc => _onPricesUpdated',
).ignore();
return;
}
final coins = Map<String, Coin>.of(state.coins);
for (final entry in state.coins.entries) {
final coin = entry.value;
final CexPrice? usdPrice = prices[abbr2Ticker(coin.abbr)];
if (usdPrice != coin.usdPrice) {
changed = true;
// Create new coin instance with updated price
coins[entry.key] = coin.copyWith(usdPrice: usdPrice);
}
}
if (changed) {
final newWalletCoins = state.walletCoins.map(
(String coinId, Coin coin) => MapEntry<String, Coin>(
coinId,
coin.copyWith(usdPrice: coins[coinId]!.usdPrice),
),
);
emit(
state.copyWith(
coins: coins,
walletCoins: {...state.walletCoins, ...newWalletCoins},
),
);
}
log('CEX prices updated', path: 'coins_bloc => updateCoinsCexPrices')
.ignore();
}
Future<void> _onLogin(
CoinsSessionStarted event,
Emitter<CoinsState> emit,
) async {
_coinsRepo.flushCache();
_currentUserCache = event.signedInUser;
await _activateLoginWalletCoins(emit);
emit(state.copyWith(loginActivationFinished: true));
add(CoinsBalancesRefreshed());
add(CoinsBalanceMonitoringStarted());
}
Future<void> _onLogout(
CoinsSessionEnded event,
Emitter<CoinsState> emit,
) async {
add(CoinsBalanceMonitoringStopped());
_currentUserCache = null;
final List<Coin> coins = [...state.walletCoins.values];
for (final Coin coin in coins) {
switch (coin.enabledType) {
case WalletType.iguana:
case WalletType.hdwallet:
coin.reset();
final newWalletCoins = Map<String, Coin>.of(state.walletCoins);
newWalletCoins.remove(coin.abbr.toUpperCase());
emit(state.copyWith(walletCoins: newWalletCoins));
log('${coin.name} has been removed', path: 'coins_bloc => _onLogout')
.ignore();
case WalletType.trezor:
case WalletType.metamask:
case WalletType.keplr:
case null:
break;
}
coin.reset();
}
emit(
state.copyWith(
walletCoins: {},
loginActivationFinished: false,
coins: {
...state.coins,
...coins.map((coin) => coin.copyWith(balance: 0)).toList().toMap(),
},
),
);
_coinsRepo.flushCache();
}
Future<List<Coin>> _activateCoins(
Iterable<String> coins,
Emitter<CoinsState> emit,
) async {
// Start off by emitting the newly activated coins so that they all appear
// in the list at once, rather than one at a time as they are activated
_prePopulateListWithActivatingCoins(coins, emit);
try {
await _kdfSdk.addActivatedCoins(coins);
} catch (e, s) {
log(
'Failed to activate coins in SDK: $e',
isError: true,
path: 'coins_bloc => _activateCoins',
trace: s,
).ignore();
// Update state to reflect failure
return [];
}
final enabledAssets = await _kdfSdk.assets.getEnabledCoins();
final coinsToActivate =
coins.where((coin) => !enabledAssets.contains(coin));
final enableFutures =
coinsToActivate.map((coin) => _activateCoin(coin)).toList();
final results = <Coin>[];
await for (final coin
in Stream<Coin>.fromFutures(enableFutures).asBroadcastStream()) {
results.add(coin);
emit(
state.copyWith(
walletCoins: {...state.walletCoins, coin.abbr: coin},
coins: {...state.coins, coin.abbr: coin},
),
);
}
return results;
}
void _prePopulateListWithActivatingCoins(
Iterable<String> coins,
Emitter<CoinsState> emit,
) {
final activatingCoins = Map<String, Coin>.fromIterable(
coins
.map(
(coin) {
final sdkCoin = state.coins[coin] ?? _coinsRepo.getCoin(coin);
return sdkCoin?.copyWith(
state: CoinState.activating,
enabledType: _currentUserCache?.wallet.config.type,
);
},
)
.where((coin) => coin != null)
.cast<Coin>(),
key: (element) => (element as Coin).abbr,
);
emit(
state.copyWith(
walletCoins: {...state.walletCoins, ...activatingCoins},
coins: {...state.coins, ...activatingCoins},
),
);
}
Future<Coin> _activateCoin(String coinId) async {
Coin? coin = state.coins[coinId] ?? _coinsRepo.getCoin(coinId);
if (coin == null) {
throw ArgumentError.value(coinId, 'coinId', 'Coin not found');
}
try {
final isLoggedIn = _currentUserCache != null;
if (!isLoggedIn || coin.isActive) {
return coin;
}
switch (_currentUserCache?.wallet.config.type) {
case WalletType.iguana:
case WalletType.hdwallet:
coin = await _activateIguanaCoin(coin);
case WalletType.trezor:
coin = await _activateTrezorCoin(coin, coinId);
case WalletType.metamask:
case WalletType.keplr:
case null:
break;
}
} catch (e, s) {
log(
'Error activating coin ${coin!.id.toString()}',
isError: true,
trace: s,
);
}
return coin;
}
Future<Coin> _activateTrezorCoin(Coin coin, String coinId) async {
final asset = _kdfSdk.assets.available[coin.id];
if (asset == null) {
log('Failed to find asset for coin: ${coin.id}', isError: true);
return coin.copyWith(state: CoinState.suspended);
}
final accounts = await _trezorBloc.activateCoin(asset);
final state = accounts.isNotEmpty ? CoinState.active : CoinState.suspended;
return coin.copyWith(state: state, accounts: accounts);
}
Future<Coin> _activateIguanaCoin(Coin coin) async {
try {
log('Enabling a ${coin.name}', path: 'coins_bloc => enable').ignore();
await _coinsRepo.activateCoinsSync([coin]);
coin.state = CoinState.active;
log('${coin.name} has enabled', path: 'coins_bloc => enable').ignore();
} catch (e, s) {
coin.state = CoinState.suspended;
log(
'Failed to activate iguana coin: $e',
isError: true,
path: 'coins_bloc => _activateIguanaCoin',
trace: s,
).ignore();
}
return coin;
}
Future<List<Coin>> _activateLoginWalletCoins(Emitter<CoinsState> emit) async {
final Wallet? currentWallet = _currentUserCache?.wallet;
if (currentWallet == null) {
return List.empty();
}
return _activateCoins(currentWallet.config.activatedCoins, emit);
}
Stream<List<Coin>> _reActivateSuspended(
Emitter<CoinsState> emit, {
int attempts = 1,
}) async* {
final List<String> coinsToBeActivated = [];
for (int i = 0; i < attempts; i++) {
final List<String> suspended = state.walletCoins.values
.where((coin) => coin.isSuspended)
.map((coin) => coin.abbr)
.toList();
coinsToBeActivated.addAll(suspended);
coinsToBeActivated.addAll(_getUnactivatedWalletCoins());
if (coinsToBeActivated.isEmpty) return;
yield await _activateCoins(coinsToBeActivated, emit);
}
}
List<String> _getUnactivatedWalletCoins() {
final Wallet? currentWallet = _currentUserCache?.wallet;
if (currentWallet == null) {
return List.empty();
}
return currentWallet.config.activatedCoins
.where((coinId) => !state.walletCoins.containsKey(coinId))
.toList();
}
/// yields one coin at a time to provide visual feedback to the user as
/// coins are activated
Stream<Coin> _syncIguanaCoinsStates(Iterable<String> coins) async* {
final walletCoins = state.walletCoins;
for (final coinId in coins) {
final Coin? apiCoin = await _coinsRepo.getEnabledCoin(coinId);
final coin = walletCoins[coinId];
if (coin == null) {
log('Coin $coinId removed from wallet, skipping sync').ignore();
continue;
}
if (apiCoin != null) {
// enabled on gui side, but not on api side - suspend
if (coin.state != CoinState.active) {
yield coin.copyWith(state: CoinState.active);
}
} else {
// enabled on both sides - unsuspend
yield coin.copyWith(state: CoinState.suspended);
}
for (final String apiCoinId in await _kdfSdk.assets.getEnabledCoins()) {
if (!walletCoins.containsKey(apiCoinId)) {
// enabled on api side, but not on gui side - enable on gui side
final apiCoin = await _coinsRepo.getEnabledCoin(apiCoinId);
if (apiCoin != null) {
yield apiCoin;
}
}
}
}
}
}