67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
package domain
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import (
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"errors"
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"time"
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)
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var ErrInvalidAuthorizationTransition = errors.New("invalid authorization status transition")
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type AuthorizationStatus string
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const (
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AuthorizationStatusActive AuthorizationStatus = "ACTIVE"
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AuthorizationStatusClaimed AuthorizationStatus = "CLAIMED"
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AuthorizationStatusFenced AuthorizationStatus = "FENCED"
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AuthorizationStatusConsumed AuthorizationStatus = "CONSUMED"
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AuthorizationStatusExpired AuthorizationStatus = "EXPIRED"
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AuthorizationStatusAbandoned AuthorizationStatus = "ABANDONED"
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)
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type OrderAuthorization struct {
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ID string
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TaskID string
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TaskVersion int
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StartKey string
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GoodsID string
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SKUColor string
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SKUSize string
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Quantity int
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TotalPriceCap string
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Status AuthorizationStatus
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CreatedBy string
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CreatedAt time.Time
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ExpiresAt time.Time
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}
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// CanTransitionTo 围栏后的授权只能消费，不能回到可领取或可过期状态，以防重复采购。
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func (status AuthorizationStatus) CanTransitionTo(next AuthorizationStatus) bool {
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_, allowed := authorizationTransitions[status][next]
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return allowed
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}
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// TransitionAuthorization 返回下一状态；未定义的授权状态转移一律失败。
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func TransitionAuthorization(current, next AuthorizationStatus) (AuthorizationStatus, error) {
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if !current.CanTransitionTo(next) {
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return current, ErrInvalidAuthorizationTransition
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}
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return next, nil
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}
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var authorizationTransitions = map[AuthorizationStatus]map[AuthorizationStatus]struct{}{
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AuthorizationStatusActive: {
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AuthorizationStatusClaimed: {},
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AuthorizationStatusExpired: {},
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AuthorizationStatusAbandoned: {},
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},
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AuthorizationStatusClaimed: {
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AuthorizationStatusFenced: {},
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AuthorizationStatusExpired: {},
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AuthorizationStatusAbandoned: {},
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},
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AuthorizationStatusFenced: {
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AuthorizationStatusConsumed: {},
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},
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}
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