ODIAN Launcher: hub, installer, local stack and remembered sign-in (M2)
- Tauri 2 + Svelte 5 hub in ODIAN dark: patch notes and roadmap, install and update progress, local stack status, settings with DHP and MCP addresses. - crates/odian-packs: Rust installer for pack format v1 (signed manifests, resumable verified downloads from a DHP or an ODIAN drive), byte-compatible with ODIAN_MCP_Server's Python odian_packs. - Local stack on 127.0.0.1: Postgres -> Engine API -> tile server -> Odian.exe, one Job Object, clean shutdown; database snapshot restore on a fresh PC only. - Keycloak sign-in through the DHP's MCP, remembered until Sign out with a launcher session that renews the Engine token silently. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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# UI ↔ backend contract
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The Svelte UI (`src/`) talks to the Rust backend (`src-tauri/`) only through the
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Tauri commands and events below. `src/lib/backend.ts` is the single place that
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calls them. When the page runs outside Tauri (a plain browser, for design work),
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it falls back to a mock with the same shapes.
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All names are snake_case on the wire (serde defaults), and timestamps are Unix seconds.
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## Types
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```ts
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type Phase =
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| "idle" // nothing running
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| "checking" // probing the site
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| "signing_in" // browser sign-in in progress
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| "installing" // downloading + verifying a version
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| "restoring" // loading the database snapshot into local Postgres
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| "launching" // starting Postgres → API → tile server → Odian.exe
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| "running" // Odian.exe is open
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| "error"; // the last long operation failed; see `error`
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interface Status {
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online: boolean; // the site's update service answered /v1/health
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site: { url: string; name: string | null };
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operator: string | null; // last signed-in ODIAN username (cached; valid offline)
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signed_in: boolean; // this PC remembers the operator's site sign-in until Sign out: the
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// launcher renews the short Engine token by itself (launcher session)
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installed: string | null; // installed version, e.g. "0.51.0"
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available: string | null; // the site's CURRENT version (online only)
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update_required: boolean; // online && installed !== null && available !== null && installed !== available
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// (never true when nothing is installed: that is a first install)
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can_launch: boolean; // installed && !update_required && phase is idle or error
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phase: Phase;
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error: string | null; // set with phase "error"; cleared by the next command or `refresh`
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install_dir: string; // e.g. "D:\\ODIAN"
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}
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interface Settings {
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site_url: string; // e.g. "http://192.168.1.41:30097"
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mcp_url: string; // site MCP, for Keycloak sign-in
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install_dir: string;
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}
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interface InstallProgress {
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stage: "manifest" | "app" | "db" | "src" | "tiles" | "restore" | "finalize";
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stage_index: number; // 1-based
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stage_count: number;
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done_bytes: number; // within the current stage
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total_bytes: number; // of the current stage; 0 when unknown
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done_items: number; // within the current stage
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total_items: number;
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bytes_per_sec: number;
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message: string | null; // e.g. "tiles dark/protomaps_20260423: 412/1402 blocks"
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}
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interface StackEvent {
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component: "postgres" | "api" | "tiles" | "odian";
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state: "starting" | "ready" | "stopped" | "failed";
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message: string | null;
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}
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interface LogEvent { level: "info" | "warn" | "error"; message: string; at: number }
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```
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## Commands (`invoke`)
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| Command | Args | Returns | Notes |
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|---|---|---|---|
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| `get_status` | — | `Status` | cheap; no network |
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| `refresh` | — | `Status` | re-probes the site (2 s timeout); also clears an `error` phase |
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| `sign_in` | — | `{ username: string }` | opens the system browser (MCP desktop flow) and waits for the loopback callback. Rejects with "Sign-in was cancelled." after `cancel_sign_in` (phase returns to idle, not error). |
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| `cancel_sign_in` | — | `void` | abandons a sign-in that is waiting for the browser |
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| `sign_out` | — | `Status` | forgets the operator on this PC: the site sign-in, its launcher session (ended on the site when reachable) and the cached operator. **Offline launch needs a new sign-in afterwards**, so the UI confirms first |
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| `get_notes` | `{ version?: string }` | `string` | Markdown. From the site when online; the cached copy of the installed version offline. **Untrusted: the UI must sanitize.** |
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| `open_external` | `{ url: string }` | `void` | opens an `http`/`https` link in the system browser (links in patch notes); anything else is refused |
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| `start_install` | — | `void` | installs or updates to `available`; needs `signed_in` (the site checks the token); progress arrives as events |
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| `start_install_from_drive` | `{ path: string }` | `void` | same, reading an ODIAN drive (SSD) instead of the site; no sign-in needed |
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| `cancel_install` | — | `void` | stops at the next file boundary; everything already verified is kept |
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| `launch` | — | `void` | starts the local stack; `stack` events follow |
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| `stop` | — | `void` | stops Odian.exe's stack cleanly |
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| `get_stack` | — | `StackEvent[]` | the latest event per component of the current or last launch (for a reloaded UI) |
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| `get_settings` | — | `Settings` | |
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| `set_settings` | `{ settings: Settings }` | `Status` | |
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| `pick_folder` | — | `string \| null` | native folder picker |
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Errors reject the promise with a string message.
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Planned, not yet available: the size of `available` for the Install button, and
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inspecting a drive (its version and size) before installing from it.
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## Events (`listen`)
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| Event | Payload | When |
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|---|---|---|
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| `status` | `Status` | whenever any field changes |
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| `install-progress` | `InstallProgress` | at most ~10 per second while installing |
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| `stack` | `StackEvent` | on each component state change |
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| `log` | `LogEvent` | notable backend messages, for the activity panel |
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