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Rely on event & log streams of Liquid SDK plugin (#20)
* Create Event, Log stream & connection management for Liquid SDK * Renamed node state to wallet info * Applied breaking changes for - get_info: remove with_scan argument breez-liquid-sdk#306 - getInfo API no longer has a request param - Receive: Switch payment to pending state when lockup is in the mempool breez-liquid-sdk#301 - Payment.txID is now an optional field - Receive: Add zero-conf checks and properly manage state updates breez-liquid-sdk#292 - A new optional field, zeroConfMinFeeRate is added to Config - Add magic routing hint support breez-liquid-sdk#265 - Payment.feesSat is no longer an optional field
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| import 'dart:async'; | ||
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| import 'package:flutter_breez_liquid/flutter_breez_liquid.dart' as liquid_sdk; | ||
| import 'package:rxdart/rxdart.dart'; | ||
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| class BreezLiquidSDK { | ||
| liquid_sdk.BindingLiquidSdk? wallet; | ||
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| Future<liquid_sdk.BindingLiquidSdk> connect({ | ||
| required liquid_sdk.ConnectRequest req, | ||
| }) async { | ||
| wallet = await liquid_sdk.connect(req: req); | ||
| _initializeEventsStream(wallet!); | ||
| _subscribeToSdkStreams(wallet!); | ||
| await _fetchWalletData(wallet!); | ||
| return wallet!; | ||
| } | ||
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| void disconnect(liquid_sdk.BindingLiquidSdk sdk) { | ||
| sdk.disconnect(); | ||
| _unsubscribeFromSdkStreams(); | ||
| } | ||
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| Future _fetchWalletData(liquid_sdk.BindingLiquidSdk sdk) async { | ||
| await _getInfo(sdk); | ||
| await _listPayments(sdk); | ||
| } | ||
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| Future<liquid_sdk.GetInfoResponse> _getInfo(liquid_sdk.BindingLiquidSdk sdk) async { | ||
| final walletInfo = await sdk.getInfo(); | ||
| _walletInfoController.add(walletInfo); | ||
| return walletInfo; | ||
| } | ||
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| Future<List<liquid_sdk.Payment>> _listPayments(liquid_sdk.BindingLiquidSdk sdk) async { | ||
| final paymentsList = await sdk.listPayments(); | ||
| _paymentsController.add(paymentsList); | ||
| return paymentsList; | ||
| } | ||
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| StreamSubscription<liquid_sdk.LogEntry>? _breezLogSubscription; | ||
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| Stream<liquid_sdk.LogEntry>? _breezLogStream; | ||
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| /// Initializes SDK log stream. | ||
| /// | ||
| /// Call once on your Dart entrypoint file, e.g.; `lib/main.dart`. | ||
| void initializeLogStream() { | ||
| _breezLogStream ??= liquid_sdk.breezLogStream().asBroadcastStream(); | ||
| } | ||
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| StreamSubscription<liquid_sdk.LiquidSdkEvent>? _breezEventsSubscription; | ||
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| Stream<liquid_sdk.LiquidSdkEvent>? _breezEventsStream; | ||
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| void _initializeEventsStream(liquid_sdk.BindingLiquidSdk sdk) { | ||
| _breezEventsStream ??= sdk.addEventListener().asBroadcastStream(); | ||
| } | ||
|
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| /// Subscribes to SDK's event & log streams. | ||
| void _subscribeToSdkStreams(liquid_sdk.BindingLiquidSdk sdk) { | ||
| _subscribeToEventsStream(sdk); | ||
| _subscribeToLogStream(); | ||
| } | ||
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| final StreamController<liquid_sdk.GetInfoResponse> _walletInfoController = | ||
| BehaviorSubject<liquid_sdk.GetInfoResponse>(); | ||
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| Stream<liquid_sdk.GetInfoResponse> get walletInfoStream => _walletInfoController.stream; | ||
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| final StreamController<liquid_sdk.Payment> _paymentResultStream = StreamController.broadcast(); | ||
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| final StreamController<List<liquid_sdk.Payment>> _paymentsController = | ||
| BehaviorSubject<List<liquid_sdk.Payment>>(); | ||
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| Stream<List<liquid_sdk.Payment>> get paymentsStream => _paymentsController.stream; | ||
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| Stream<liquid_sdk.Payment> get paymentResultStream => _paymentResultStream.stream; | ||
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| /* TODO: Liquid - Log statements are added for debugging purposes, should be removed after early development stage is complete & events are behaving as expected.*/ | ||
| /// Subscribes to LiquidSdkEvent's stream | ||
| void _subscribeToEventsStream(liquid_sdk.BindingLiquidSdk sdk) { | ||
| _breezEventsSubscription = _breezEventsStream?.listen( | ||
| (event) async { | ||
| if (event is liquid_sdk.LiquidSdkEvent_PaymentFailed) { | ||
| _logStreamController | ||
| .add(liquid_sdk.LogEntry(line: "Payment Failed. ${event.details.swapId}", level: "WARN")); | ||
| _paymentResultStream.addError(PaymentException(event.details)); | ||
| } | ||
| if (event is liquid_sdk.LiquidSdkEvent_PaymentPending) { | ||
| _logStreamController | ||
| .add(liquid_sdk.LogEntry(line: "Payment Pending. ${event.details.swapId}", level: "INFO")); | ||
| _paymentResultStream.add(event.details); | ||
| } | ||
| if (event is liquid_sdk.LiquidSdkEvent_PaymentRefunded) { | ||
| _logStreamController | ||
| .add(liquid_sdk.LogEntry(line: "Payment Refunded. ${event.details.swapId}", level: "INFO")); | ||
| _paymentResultStream.add(event.details); | ||
| } | ||
| if (event is liquid_sdk.LiquidSdkEvent_PaymentRefundPending) { | ||
| _logStreamController.add( | ||
| liquid_sdk.LogEntry(line: "Pending Payment Refund. ${event.details.swapId}", level: "INFO")); | ||
| _paymentResultStream.add(event.details); | ||
| } | ||
| if (event is liquid_sdk.LiquidSdkEvent_PaymentSucceeded) { | ||
| _logStreamController | ||
| .add(liquid_sdk.LogEntry(line: "Payment Succeeded. ${event.details.swapId}", level: "INFO")); | ||
| _paymentResultStream.add(event.details); | ||
| await _fetchWalletData(sdk); | ||
| } | ||
| if (event is liquid_sdk.LiquidSdkEvent_PaymentWaitingConfirmation) { | ||
| _logStreamController.add(liquid_sdk.LogEntry( | ||
| line: "Payment Waiting Confirmation. ${event.details.swapId}", level: "INFO")); | ||
| _paymentResultStream.add(event.details); | ||
| } | ||
| if (event is liquid_sdk.LiquidSdkEvent_Synced) { | ||
| _logStreamController.add(const liquid_sdk.LogEntry(line: "Received Synced event.", level: "INFO")); | ||
| await _fetchWalletData(sdk); | ||
| } | ||
| }, | ||
| ); | ||
| } | ||
|
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| final _logStreamController = StreamController<liquid_sdk.LogEntry>.broadcast(); | ||
|
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| Stream<liquid_sdk.LogEntry> get logStream => _logStreamController.stream; | ||
|
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| /// Subscribes to SDK's logs stream | ||
| void _subscribeToLogStream() { | ||
| _breezLogSubscription = _breezLogStream?.listen((logEntry) { | ||
| _logStreamController.add(logEntry); | ||
| }, onError: (e) { | ||
| _logStreamController.addError(e); | ||
| }); | ||
| } | ||
|
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| /// Unsubscribes from SDK's event & log streams. | ||
| void _unsubscribeFromSdkStreams() { | ||
| _breezEventsSubscription?.cancel(); | ||
| _breezLogSubscription?.cancel(); | ||
| } | ||
| } | ||
|
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| // TODO: Liquid - Return this exception from the SDK directly | ||
| class PaymentException { | ||
| final liquid_sdk.Payment details; | ||
|
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| const PaymentException(this.details); | ||
| } |
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