julian
bfe64032d8
Turborepo (pnpm workspaces) with all dependencies pinned to latest mutually-compatible versions: turbo 2.9, TypeScript 6, Fastify 5, React 19, Vite 8, better-sqlite3 12 + Drizzle ORM 0.45. Layout: - apps/server Fastify backend (local JWT auth + role guard, /health) - apps/web React 19 + Vite 8 operator SPA - packages/db Drizzle schema on SQLite/WAL; append-only events + users - packages/devices reader/printer/relay adapter interfaces (intent-only relay) - packages/shared shared domain types Architecture constraints from the design wiki are encoded in the scaffold: append-only hash-chained + signed event log, device-agnostic adapters, "a barrier is not a door" (relay expresses intent only), fully-local offline-first auth. wiki/ is an LLM-maintained Obsidian knowledge base (28 pages) ingested from the architecture & design notes, with its own maintenance schema. Verified: pnpm install, full turbo build (5/5), server boots and serves /health, drizzle-kit generates the initial migration.
33 lines
1.1 KiB
Markdown
33 lines
1.1 KiB
Markdown
---
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type: concept
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tags: [parking, architecture, devices]
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sources: [parking-system-architecture]
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updated: 2026-06-14
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---
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# Device-Adapter Pattern
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How the system stays **device-agnostic**: business logic talks **only to interfaces, never to a
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device SDK**. Each physical device is an adapter implementing one interface; **swapping hardware
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means writing a new adapter and nothing else changes.** Implemented as isolated [[fastify]]
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plugins emitting onto a shared internal event bus. (See [[parking-system-architecture]] §5.)
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```ts
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interface CardReaderDevice {
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connect(): Promise<void>
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onCardRead(cb: (cardNumber: string, door: number) => void): void
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disconnect(): Promise<void>
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}
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interface PrinterDevice {
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printTicket(data: TicketData): Promise<void>
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checkStatus(): Promise<'ready' | 'offline' | 'paper_out'>
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}
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interface RelayDevice {
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pulseOpen(doorId: number): Promise<void> // intent only — see safety note
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getDoorStatus(doorId: number): Promise<'open' | 'closed'>
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}
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```
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Note the `RelayDevice` expresses **intent only** — see the [[barrier-not-a-door]] safety
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principle. The choice of *which* adapter to trust is the [[trust-boundary]] decision.
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