54 lines
2.3 KiB
Go
54 lines
2.3 KiB
Go
// Package order is the platform's shared order seam: the exported wire shape of
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// the `order.created` domain event (B4.1). It is the contract between the order
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// service (producer) and every reactor — inventory commit, fulfillment
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// allocation, loyalty, ERP sync — none of which the order service knows about.
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//
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// Like platform/catalog and platform/inventory, it holds only the wire value
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// types + encode/decode, and imports only the stdlib.
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//
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// `order.created` is a FACT, not a request: by the time it is emitted the order
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// is placed and paid. Reactors must be idempotent (the transport is
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// at-least-once) and must not assume they can refuse it — the sale already
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// happened. Oversell on commit is reconciled downstream (backorder), not
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// prevented here.
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package order
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import "encoding/json"
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// Line is one ordered line item, reduced to what reactors need: the SKU, how
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// many units sold, and the inventory location to commit against. Pricing/tax
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// live in the order grain, not on this seam.
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type Line struct {
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SKU string `json:"sku"`
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Quantity int `json:"quantity"`
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// Location is the inventory location / store id to decrement. Empty means
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// "use the order's Country" (central stock) — see Created.Country.
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Location string `json:"location,omitempty"`
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}
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// Created is the payload of an event.OrderCreated envelope.
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//
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// Country is the default inventory location for the commit (central stock). A
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// Line may override it with its own Location (store id); when a line's Location
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// is empty the commit falls back to Country. See docs/inventory-shape.md.
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type Created struct {
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OrderID string `json:"order_id"`
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OrderReference string `json:"order_reference,omitempty"`
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CartID string `json:"cart_id,omitempty"`
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Country string `json:"country"`
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Currency string `json:"currency,omitempty"`
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CustomerEmail string `json:"customer_email,omitempty"`
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Lines []Line `json:"lines"`
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PlacedAtMs int64 `json:"placed_at_ms,omitempty"`
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}
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// Encode serialises the payload for event.Event.Payload.
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func (c Created) Encode() ([]byte, error) { return json.Marshal(c) }
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// Decode parses an order.created payload — the consumer side of Encode.
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func Decode(raw []byte) (Created, error) {
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var c Created
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err := json.Unmarshal(raw, &c)
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return c, err
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}
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