Firebase API for Godot 4

Adds Firebase connectivity to your Godot 4 project.

Install

Make sure there's no other Firebase plugin/autoload in your project.

1. Put the addons folder in your project's main directory
2. Enable the plugin in Project > Project Settings > Plugins

If it's enabled but you still have no Firebase in your autoloads, disable and re-enable it again.

---

Use

Unlike GodotFirebase, on which this library is based, you initialize it manually.

Add this to your main scene and enter your Firebase configuration as fields of the corresponding keys in firebaseConfig:

const firebaseConfig = {
	"apiKey": "",
	"authDomain": "",
	"databaseURL": "",
	"projectId": "",
	"storageBucket": "",
	"messagingSenderId": "",
	"appId": "",
	"measurementId": ""
}

func _ready():
    Firebase.setup_modules(firebaseConfig)

This approach allows you to have multiple Firebase configurations in the same application and apply them at runtime. Like this:

const configs = {
    "config1" : {...},
    "config2" : {...}
}

func _ready():
    Firebase.setup_modules(configs.config1)
    do_some_things()
    Firebase.setup_modules(configs.config2)
    do_other_things()

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Differences with GodotFirebase

Despite a slightly different architecture, Firebase API 4.x inherited most of the original methods and signals, so you can refer to the original wiki for guidance.

The only differences in nomenclature are as follows:

FirestoreCollection class:

GodotFirebase	Firebase API 4.x
func get(...) *	func get_doc(...)

^{* get() is reserved in Godot 4}

FirestoreCollection and FirestoreTask classes:

GodotFirebase	Firebase API 4.x
signal add_document(doc)	signal document_added(doc)
signal get_document(doc)	signal document_got(doc)
signal update_document(doc)	signal document_updated(doc)
signal delete_document	signal document_deleted

Firestore and FirestoreTask classes:

GodotFirebase	Firebase API 4.x
signal listed_documents(docs)	signal documents_listed(docs)

Firebase Realtime Database

Besides initialization, the only significant usage-wise difference with GodotFirebase involves Firebase Realtime Database.

To initialize a Realtime Database reference, use this method of FirebaseRealtime:

func get_realtime_reference(path := "", filter := {}) -> FirebaseRealtimeReference

Providing a path is optional: if you don't, the reference will work through the entire database.

The following will allow you to listen for changes in the database (or the given path):

func _ready():
    var path : String
    var ref = Firebase.Realtime.get_realtime_reference(path)
    ref.new_data_update.connect(myfunc)

func myfunc(update):
    print(update.data)

The signal new_data_update is emitted everytime there's a change in the referenced path in your database.

Please note that when a new key is created in the database, the creation event itself will not fire an update signal.

A path is optional when calling FirebaseRealtimeReference.update() too. The method will just use the reference's path, if possible.

Examples:

func _ready():
    var ref = Firebase.Realtime.get_realtime_reference()
    var somedata = {...}
    ref.update(somedata, "path")

This will update root/path.

func _ready():
    var ref = Firebase.Realtime.get_realtime_reference("path")
    var somedata = {...}
    ref.update(somedata)

This will update root/path too.

func _ready():
    var ref = Firebase.Realtime.get_realtime_reference("path")
    var somedata = {...}
    ref.update(somedata, "more_path")

This will update root/path/more_path.

Trying to update() the database root with a non-Dictionary value will result in a soft error:

func _ready():
    # don't do this
    var ref = Firebase.Realtime.get_realtime_reference() # no initial path is provided
    ref.update("asdasd") # no additional path is provided and data is not a Dictionary
    
    # will print an error

Be aware that calling delete() in a reference with no initial path will result in the complete deletion of the database's content.