Firebase Admin Adapter

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Hyper Fetch's Firebase adapters provide seamless integration with both Firebase Realtime Database and Firestore. This allows you to use the power and convenience of Hyper-fetch with your Firebase backend, for both web and admin environments, with a unified and consistent API.

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Purpose

1. Unified API: Provides a single interface for both Realtime Database and Firestore.
2. Isomorphic: Supports both client-side (web) and server-side (admin) Firebase applications.
3. Real-time Data: Includes socket adapters for real-time data listeners.
4. Standardized Queries: Simplifies filtering and querying with a consistent constraint-based syntax.
5. Simplified Data Handling: Automatically handles Firebase-specific data structures, returning clean arrays.

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Choosing the Right Package

Hyper-fetch offers two distinct packages for Firebase integration, tailored to different environments. Your choice depends on whether you are working in a client-side web application or a server-side admin environment.

Web Applications (@hyper-fetch/firebase)

Use this package for client-side applications running in the browser.

• firebaseAdapter: For standard database operations (get, set, update).
• firebaseSocketsAdapter: For setting up real-time listeners to your database.

Server-side / Admin Environments (@hyper-fetch/firebase-admin)

Use this package for backend applications using the Firebase Admin SDK.

• firebaseAdminAdapter: For standard database operations.
• firebaseSocketsAdminAdapter: For real-time listeners on the server.

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Client Setup

Once you've chosen the right package, you need to initialize Firebase and configure the Hyper-fetch Client. The process is similar for both web and admin environments, with the main difference being the package import and Firebase initialization.

Here's an example of setting up the client for a server-side application:

import { Client } from "@hyper-fetch/core";
import { firebaseAdminAdapter } from "@hyper-fetch/firebase-admin";
import * as admin from "firebase-admin";

// 1. Initialize Firebase Admin
// Make sure to replace with your actual service account key and database URL
const serviceAccount = require("./path/to/your/serviceAccountKey.json");

admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  databaseURL: "https://your-project-id.firebaseio.com",
});

const db = admin.firestore();

// 2. Create a Hyper-fetch client with the Firebase admin adapter
const client = new Client({ url: "teas/" }).setAdapter(() => firebaseAdminAdapter(db));

// 3. Create a request
const getTeas = client.createRequest<{ response Tea[] }>()({
  endpoint: "",
  method: "getDocs",
});

// 4. Send the request and check the results
const { data, status, extra, success, error } = await getTeas.send();

For a web application, you would import from @hyper-fetch/firebase and use the Firebase JS SDK for initialization. The Hyper-fetch logic for creating requests and handling responses remains the same.

Response Object

The response from a Firebase request includes:

• data: The data from the database. Each document is enhanced with a __key property representing its ID.
• status: A status of success, error, or emptyResource (if the request was successful but returned no data).
• success: A boolean indicating if the request was successful.
• error: An error object if the request failed.
• extra: Additional properties, such as the ref and snapshot from Firestore for a getDocs method.

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Querying Data

The Firebase adapters provide a standardized way to filter and limit your queries using the constraints query parameter. This approach ensures a consistent API across Realtime Database and Firestore, for both web and admin versions.

You can build complex queries by passing an array of constraints.

import { $limit, $orderBy, $where } from "@hyper-fetch/firebase-admin";

const getTeas = client.createRequest<{ response Tea[] }>()({
  endpoint: "",
  method: "getDocs",
});

const { data } = await getTeas.send({
  queryParams: {
    constraints: [$where("type", "==", "Green"), $orderBy("year"), $limit(1)],
  },
});

Available Constraints

The adapter provides wrappers for most of Firebase's query methods:

• Filtering: $where, $startAt, $startAfter, $endAt, $endAfter, $equalTo
• Ordering: $orderBy, $orderByChild, $orderByKey, $orderByValue
• Limiting: $limit, $limitToFirst, $limitToLast

These functions work just like their native Firebase counterparts.

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Data Handling

The Firebase adapters include logic to simplify data handling, particularly with array-like structures in the Realtime Database.

Automatic Array Conversion

In Firebase Realtime Database, if you store an array and then remove items, it may no longer be sequential. For example, deleting elements a and b from [a, b, c, d, e] might result in Firebase returning an object like {2: 'c', 4: 'e'} instead of an array.

Hyper-fetch automatically converts such objects back into an array. Each item in the resulting array will have a __key property containing its original key from the database. This ensures you always work with predictable array structures.