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avoid race condition

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sneurlax 2024-02-14 11:51:59 -06:00
parent 98c095b568
commit e979a352fb
1 changed files with 60 additions and 57 deletions
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117
lib/wallets/wallet/wallet_mixin_interfaces/electrumx_interface.dart
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@ -848,71 +848,74 @@ mixin ElectrumXInterface<T extends Bip39HDCurrency> on Bip39HDWallet<T> {
ElectrumxChainHeightService.timeStarted[cryptoCurrency.coin] =
subscriptionCreationTime;
// Set stream subscription.
ElectrumxChainHeightService.subscriptions[cryptoCurrency.coin] =
subscription.responseStream.asBroadcastStream().listen((event) {
final response = event;
if (response != null &&
response is Map &&
response.containsKey('height')) {
final int chainHeight = response['height'] as int;
// print("Current chain height: $chainHeight");
// Doublecheck to avoid race condition.
if (ElectrumxChainHeightService.subscriptions[cryptoCurrency.coin] ==
null) {
// Set stream subscription.
ElectrumxChainHeightService.subscriptions[cryptoCurrency.coin] =
subscription.responseStream.asBroadcastStream().listen((event) {
final response = event;
if (response != null &&
response is Map &&
response.containsKey('height')) {
final int chainHeight = response['height'] as int;
// print("Current chain height: $chainHeight");
_latestHeight = chainHeight;
_latestHeight = chainHeight;
if (isFirstResponse) {
// If the completer is not completed, complete it.
if (!ElectrumxChainHeightService
.completers[cryptoCurrency.coin]!.isCompleted) {
// Complete the completer, returning the chain height.
ElectrumxChainHeightService.completers[cryptoCurrency.coin]!
.complete(chainHeight);
if (isFirstResponse) {
// If the completer is not completed, complete it.
if (!ElectrumxChainHeightService
.completers[cryptoCurrency.coin]!.isCompleted) {
// Complete the completer, returning the chain height.
ElectrumxChainHeightService.completers[cryptoCurrency.coin]!
.complete(chainHeight);
}
}
} else {
Logging.instance.log(
"blockchain.headers.subscribe returned malformed response\n"
"Response: $response",
level: LogLevel.Error);
}
} else {
Logging.instance.log(
"blockchain.headers.subscribe returned malformed response\n"
"Response: $response",
level: LogLevel.Error);
}
});
} else {
// A subscription already exists.
//
// Resume the stream subscription if it's paused.
if (ElectrumxChainHeightService
.subscriptions[cryptoCurrency.coin]!.isPaused) {
// If it's paused, resume it.
ElectrumxChainHeightService.subscriptions[cryptoCurrency.coin]!
.resume();
});
}
}
// Causes synchronization to stall.
// // Check if the stream subscription is active by pinging it.
// if (!(await subscribableElectrumXClient.ping())) {
// // If it's not active, reconnect it.
// final node = await getCurrentElectrumXNode();
//
// await subscribableElectrumXClient.connect(
// host: node.address, port: node.port);
//
// // Wait for first response.
// return completer.future;
// }
// A subscription already exists.
//
// Resume the stream subscription if it's paused.
if (ElectrumxChainHeightService
.subscriptions[cryptoCurrency.coin]!.isPaused) {
// If it's paused, resume it.
ElectrumxChainHeightService.subscriptions[cryptoCurrency.coin]!.resume();
}
// If there's no completer set for this coin, something's gone wrong.
//
// The completer is always set before the subscription, so this should
// never happen.
if (ElectrumxChainHeightService.completers[cryptoCurrency.coin] == null) {
// Clear this coin's subscription.
await ElectrumxChainHeightService.subscriptions[cryptoCurrency.coin]!
.cancel();
ElectrumxChainHeightService.subscriptions[cryptoCurrency.coin] = null;
// Causes synchronization to stall.
// // Check if the stream subscription is active by pinging it.
// if (!(await subscribableElectrumXClient.ping())) {
// // If it's not active, reconnect it.
// final node = await getCurrentElectrumXNode();
//
// await subscribableElectrumXClient.connect(
// host: node.address, port: node.port);
//
// // Wait for first response.
// return completer.future;
// }
// Retry/recurse.
return await _manageChainHeightSubscription();
}
// If there's no completer set for this coin, something's gone wrong.
//
// The completer is always set before the subscription, so this should
// never happen.
if (ElectrumxChainHeightService.completers[cryptoCurrency.coin] == null) {
// Clear this coin's subscription.
await ElectrumxChainHeightService.subscriptions[cryptoCurrency.coin]!
.cancel();
ElectrumxChainHeightService.subscriptions[cryptoCurrency.coin] = null;
// Retry/recurse.
return await _manageChainHeightSubscription();
}
// Check if the subscription has been running for too long.