50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
package main
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import (
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"fmt"
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messages "git.tornberg.me/go-cart-actor/pkg/messages"
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)
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// mutation_initialize_checkout.go
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//
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// Registers the InitializeCheckout mutation.
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// This mutation is invoked AFTER an external Klarna checkout session
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// has been successfully created or updated. It persists the Klarna
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// order reference / status and marks the cart as having a payment in progress.
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//
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// Behavior:
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// - Sets OrderReference to the Klarna order ID (overwriting if already set).
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// - Sets PaymentStatus to the current Klarna status.
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// - Sets / updates PaymentInProgress flag.
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// - Does NOT alter pricing or line items (so no totals recalculation).
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//
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// Validation:
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// - Returns an error if payload is nil.
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// - Returns an error if orderId is empty (integrity guard).
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//
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// Concurrency:
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// - Relies on upstream mutation serialization for a single grain. If
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// parallel checkout attempts are possible, add higher-level guards
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// (e.g. reject if PaymentInProgress already true unless reusing
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// the same OrderReference).
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func init() {
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RegisterMutation[messages.InitializeCheckout](
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"InitializeCheckout",
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func(g *CartGrain, m *messages.InitializeCheckout) error {
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if m == nil {
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return fmt.Errorf("InitializeCheckout: nil payload")
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}
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if m.OrderId == "" {
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return fmt.Errorf("InitializeCheckout: missing orderId")
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}
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g.OrderReference = m.OrderId
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g.PaymentStatus = m.Status
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g.PaymentInProgress = m.PaymentInProgress
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return nil
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},
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// No WithTotals(): monetary aggregates are unaffected.
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)
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}
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