54 lines
1.8 KiB
Go
54 lines
1.8 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/proto"
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)
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// mutation_order_created.go
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//
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// Registers the OrderCreated mutation.
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//
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// This mutation represents the completion (or state transition) of an order
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// initiated earlier via InitializeCheckout / external Klarna processing.
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// It finalizes (or updates) the cart's order metadata.
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//
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// Behavior:
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// - Validates payload non-nil and OrderId not empty.
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// - Sets (or overwrites) OrderReference with the provided OrderId.
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// - Sets PaymentStatus from payload.Status.
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// - Marks PaymentInProgress = false (checkout flow finished / acknowledged).
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// - Does NOT adjust monetary totals (no WithTotals()).
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//
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// Notes / Future Extensions:
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// - If multiple order completion events can arrive (e.g., retries / webhook
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// replays), this handler is idempotent: it simply overwrites fields.
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// - If you need to guard against conflicting order IDs, add a check:
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// if g.OrderReference != "" && g.OrderReference != m.OrderId { ... }
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// - Add audit logging or metrics here if required.
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//
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// Concurrency:
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// - Relies on the higher-level guarantee that Apply() calls are serialized
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// per grain. If out-of-order events are possible, embed versioning or
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// timestamps in the mutation and compare before applying changes.
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func init() {
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RegisterMutation[messages.OrderCreated](
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"OrderCreated",
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func(g *CartGrain, m *messages.OrderCreated) error {
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if m == nil {
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return fmt.Errorf("OrderCreated: nil payload")
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}
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if m.OrderId == "" {
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return fmt.Errorf("OrderCreated: 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 = false
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return nil
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},
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// No WithTotals(): order completion does not modify pricing or taxes.
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)
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}
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