75 lines
3.0 KiB
Dart
75 lines
3.0 KiB
Dart
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// 功能描述：充值创建前持久化及到账恢复，不将支付拉起视作到账；版本：1.0.0。
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import '../repositories/client_repository.dart';
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import '../../domain/models/recharge.dart';
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import 'recharge_draft_store.dart';
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import 'api_client.dart';
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/// 单个页面使用一个实例；所有网络写入前确认存储所属账号。
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class RechargeFlow {
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RechargeFlow(this.repository, this.store);
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final ClientRepository repository;
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final RechargeDraftStore store;
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bool _busy = false;
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Future<Map<String, Object?>> create(PendingRecharge draft) async {
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if (_busy) throw StateError('充值正在处理中');
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_busy = true;
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try {
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final owner = await repository.rechargeDraftOwner();
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final previous = await store.read(owner);
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if (previous != null &&
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(previous.request != draft.request ||
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previous.amount != draft.amount ||
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previous.channel != draft.channel ||
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previous.payType != draft.payType)) {
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throw StateError('请先查询待确认充值');
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}
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if (previous != null) {
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// 重试先读取入账事实，避免到账后再次拉起原支付参数。
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try {
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final result = await repository.rechargeResult(previous.request);
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if (result.amount != previous.amount || result.channel != previous.channel) {
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throw StateError('充值结果与原请求不一致');
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}
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if (await repository.rechargeDraftOwner() != owner) throw StateError('充值账户已切换');
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if (result.credited) return {'recharge_status': 23};
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} on ApiException catch (error) {
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// 明确不存在才允许使用相同请求重发，网络异常不能推断订单不存在。
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if (error.code != 1112) rethrow;
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}
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}
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await store.write(owner, draft);
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if (await repository.rechargeDraftOwner() != owner) throw StateError('充值账户已切换');
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return await repository.createRecharge(
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request: draft.request,
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amount: draft.amount,
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channel: draft.channel,
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payType: draft.payType,
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);
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} finally {
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_busy = false;
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}
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}
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/// 未到账、查询失败或业务关联异常均保留原请求，方便再次核对。
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Future<RechargeRecord?> recover() async {
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if (_busy) throw StateError('充值正在处理中');
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_busy = true;
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try {
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final owner = await repository.rechargeDraftOwner();
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final draft = await store.read(owner);
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if (draft == null) return null;
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if (await repository.rechargeDraftOwner() != owner) throw StateError('充值账户已切换');
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final result = await repository.rechargeResult(draft.request);
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if (result.amount != draft.amount || result.channel != draft.channel) {
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throw StateError('充值结果与原请求不一致');
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}
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if (await repository.rechargeDraftOwner() != owner) throw StateError('充值账户已切换');
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if (result.credited) await store.delete(owner);
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return result;
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} finally {
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_busy = false;
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}
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}
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}
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