generateIdempotencyKey

String generateIdempotencyKey()

abstract final class PortalIdempotencyErrorId {
  static const requestInProgress = 'IDEMPOTENT_REQUEST_IN_PROGRESS';
  static const requestAlreadyCompleted = 'IDEMPOTENT_REQUEST_ALREADY_COMPLETED';
  static const requestPreviouslyFailed = 'IDEMPOTENT_REQUEST_PREVIOUSLY_FAILED';
  static const requestUnexpectedState = 'IDEMPOTENT_REQUEST_UNEXPECTED_STATE';
  static const keyReused = 'IDEMPOTENCY_KEY_REUSED';
  static const txMissing = 'IDEMPOTENT_TX_MISSING';

  static const all = {
    requestInProgress,
    requestAlreadyCompleted,
    requestPreviouslyFailed,
    requestUnexpectedState,
    keyReused,
    txMissing,
  };
}

import 'package:portal_flutter/portal_flutter.dart';

final portal = Portal();

// Generate one key per transfer and store it with the pending transfer,
// so a retry can reuse it.
final idempotencyKey = generateIdempotencyKey();

try {
  final txHash = await portal.sendAsset(
    chainId: 'eip155:11155111',
    to: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb',
    amount: '0.01',
    token: 'NATIVE',
    idempotencyKey: idempotencyKey,
  );

  print('Submitted — txHash: $txHash');
} on PortalException catch (e) {
  if (e.isIdempotencyRejection) {
    print('Portal already handled this key: ${e.code}');
  } else {
    print('Failed: [${e.code}] ${e.message}');
  }
}