Core Infrastructure

Core infrastructure extension for Caffeine AI.

Overview

This component provides the foundational infrastructure for all projects: backend connection configuration, Internet Identity authentication hooks, and actor management utilities.

Integration

Core infrastructure is automatically included in every project. No manual integration steps are required.

Frontend

The core-infrastructure frontend package (@caffeineai/core-infrastructure) is automatically included in every project.

App Entry Point

Wrap the app with InternetIdentityProvider and QueryClientProvider:

import { InternetIdentityProvider } from "@caffeineai/core-infrastructure";
import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
import ReactDOM from "react-dom/client";
import App from "./App";

const queryClient = new QueryClient();

ReactDOM.createRoot(document.getElementById("root")!).render(
  <QueryClientProvider client={queryClient}>
    <InternetIdentityProvider>
      <App />
    </InternetIdentityProvider>
  </QueryClientProvider>,
);

useInternetIdentity() — Authentication Hook

Provides identity state, login, and logout for Internet Identity.

Return Values

Field	Type	Description
identity	Identity | undefined	The user's identity (available after login or session restore)
login	() => void	Opens the II popup. Fire-and-forget — do not await.
clear	() => void	Logs out and clears stored identity. Fire-and-forget.
isAuthenticated	boolean	true when user has a valid identity. Use this for UI gating.
isInitializing	boolean	true while AuthClient is loading from IndexedDB
isLoggingIn	boolean	true while the II popup is open
isLoginSuccess	boolean	true only after interactive login (NOT after page reload restore)
isLoginError	boolean	true if login or initialization failed
loginError	Error | undefined	The error object when isLoginError is true

Auth State Lifecycle

Scenario	loginStatus	isAuthenticated
Page load, no stored session	"idle"	false
Restoring stored session	"initializing"	false → true
Stored session restored after reload	"idle"	true
Interactive login in progress	"logging-in"	false
Interactive login just completed	"success"	true
Login popup failed / cancelled	"loginError"	false

IMPORTANT: isLoginSuccess is only true after an interactive login via the popup — NOT when a stored identity is restored on page reload. Always use isAuthenticated for conditional rendering.

Usage

Gate authenticated UI on isAuthenticated:

const { isAuthenticated } = useInternetIdentity();

{isAuthenticated ? <AuthenticatedApp /> : <LoginScreen />}

Disable the login button while initializing or logging in:

const { login, isInitializing, isLoggingIn } = useInternetIdentity();

<button onClick={() => login()} disabled={isInitializing || isLoggingIn}>
  Sign in
</button>

login() and clear() are fire-and-forget — the hook's state fields (isLoggingIn, isInitializing) track the async lifecycle. Do not wrap them in local useState / isPending logic.

useActor() — Backend Actor Hook

Creates and manages a typed backend actor instance. Automatically re-creates the actor when the user's identity changes (login/logout).

import { useActor } from "@caffeineai/core-infrastructure";
import { createActor } from "declarations/backend";

function MyComponent() {
  const { actor, isFetching } = useActor(createActor);

  // actor is null while loading, then the typed backend actor
  if (!actor || isFetching) return <Loading />;

  // Call backend methods directly
  const data = await actor.myBackendMethod();
}

Return Values

Field	Type	Description
actor	T | null	The typed backend actor, or null while loading
isFetching	boolean	true while the actor is being created

When the identity changes (login, logout, or session restore), the actor is automatically re-created with the new identity and all dependent queries are invalidated and refetched.