Firebaser

Nuget package: https://www.nuget.org/packages/Firebaser

A lightweight mono 3.5 compatible connector to the legacy firebase api.

About Firebase

Since Firebase became part of the overall Google Cloud Services, it has split into three different database types:

• Cloud Firestore
• Storage
• Realtime Database

The original Firebase is now called Realtime Database and has support for many modern client SDKs and languages. Unfortunately, development in C# with mono isn't supported except with Unity modules. If you are a low level mod developer, this is not an option plus that most tools for serializing/deserializing are not supported under mono an .NET 3.5.

Firebaser has no dependencies and uses the old lecacy REST API that is still supported. Currently, it is mainly for public and shared game data since a lot of authentication mechanics require modern APIs to talk to hardened ssl servers and implementations are hard to find.

Firebaser uses the Firebase Realtime Database and in particular its REST API. There are only two things you need to configure it:

• the unique part of the firebase hostname
• the auth key for the service account of that instance

Setting up a new database

First, create yourself an account at https://firebase.google.com

Next, go to the Console and add a new project. The project name could be anything but be sure to set up or edit the Project ID - it will be one of the string you use to configure Firebaser.

Then, authentication needs to be set up. Click on the little gear to the right of Project Overview and choose Project Settings. Then go to Service Accounts and under Legacy Credentials, select Database secrets. Click on the Show button and make a note of the auth key it reveals. That is the second part of the Firebaser configuration.

Finally, choose Database in the main menu and scroll until you see Realtime Database. Create one by clicking the button there. While doing so, choose Start in test mode.

Database design

Once the database is created, you are good to go and you can use the resulting console view to edit and watch changes in realtime. Firebase is schemaless and creates subnodes on the fly if you use object paths that do not exist yet.

All keys must follow the following rule: If you create your own keys, they must be UTF-8 encoded, can be a maximum of 768 bytes, and cannot contain., $, #, [, ], /, or ASCII control characters 0-31 or 127. . Since Firebaser maps json nodes to fields in your C# objects, you need to make sure that those field names match these rules.

API documentation

The Realtime Database REST API is documented here. Firebaser maps its methods onto the different HTTP methods described in the API. Instead of dealing with json, it serializes and deserializes class objects you declare or have.

One handy thing to remember is that since Firebase uses a node model that maps onto json structures, you can add a complex object at any point in the tree and still use the resulting paths to access and edit the values with the same operation you used to generate the node but for its details.

Firebaser

Firebaser has a very simple API. Here is a simple fetch operation

import Firebaser;

public class MyClass  
{  
	var int Count;  
	var string Username;  
}

var databaseIdentifier = "test-firebaser";
var authToken = "6Fw1CwwMfXqmuPtjHIPs0dTBH8AXGPksp5gyyTG4";  
var client = new Connector(databaseIdentifier, authToken);  
var myInstance = client.Get<MyClass>("/MyTopic/Topic1");

which would match the following node structure:

test-firebaser.firebaseio.com  
+- MyTopic  
   +- Topic1  
      +- Count  
      +- Username  

---

Firebaser API

Constructor

public Connector(string project, string secret)

Arguments
project - name of your database (before ".firebaseio.com")
secret - the auth token from the lecacy service account

Returns
A connector instance that is used to execute commands to the REST API.

Checking for an internet connection

public bool IsAvailable(bool forceCheck = false)

Example

var databaseIdentifier = "test-firebaser";
var authToken = "6Fw1CwwMfXqmuPtjHIPs0dTBH8AXGPksp5gyyTG4";
var client = new Connector(databaseIdentifier, authToken);
var status = client.IsAvailable();

// Forcing an update:
var status2 = client.IsAvailable(true);
// Note: The internal status will only be updated every 2 seconds
// so passing `true` in `forceCheck` will force a status update.
// This will definitely add an extra connection request so try not
// to spam that call too much

Sending REST commands

public TResult Send<TObject, TResult>(Method method, string objectPath, TObject obj = default(TObject), bool shallow = false, NameValueCollection queryParams = null)

Arguments
method - enum Method, defines the HTTP method to use
objectPath - the path from the root to the object to be read or written obj - the object to read or write
shallow - if set to true, replaces all subnodes with true
queryParams - one or more key/value pairs that will be part of the query string

Returns
The resulting object of type <TResult> or null in case of a connection error

Convenience methods

// Getting objects from the database:
public TResult Get<TResult>(string objectPath, bool shallow = false, NameValueCollection queryParams = null)

// Creating new objects by create random node keys:
public string Post<TObject>(string objectPath, TObject obj, NameValueCollection queryParams = null)

// Inserting new objects with a given node key:
public string Put<TObject>(string objectPath, TObject obj, NameValueCollection queryParams = null)

// Updating a specifc value in the object tree:
public string Patch<TObject>(string objectPath, TObject obj, NameValueCollection queryParams = null)

// Removing an object:
public string Delete(string objectPath, NameValueCollection queryParams = null)

TODO

For now, there is no error handling. If you have no internet connection, all methods return null (or the default value for the type).

---

MIT License
Author: Andreas Pardeike
Based on the work of https://github.com/mgholam/fastJSON and modified to work under mono 3.5