RxFirebase

Requirements

Xcode 9.0

Swift 4.0

Installation

RxFirebase is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'RxFirebase/Firestore'
pod 'RxFirebase/RemoteConfig'
pod 'RxFirebase/Database'
pod 'RxFirebase/Storage'
pod 'RxFirebase/Auth'

Usage

import RxFirebase

• Database
• Firestore
• RemoteConfig
• Storage
• Auth

Database

Basic write operation:

let ref = Database.database().reference()

ref.child("users")
    .child("1")
    .rx
    .setValue(["username": "Arnonymous"])
    .subscribe(onNext: { _ in
        print("Document successfully updated")
    }).disposed(by: disposeBag)
    
// https://firebase.google.com/docs/database/ios/read-and-write#basic_write

Listen for value events:

let ref = Database.database().reference()

ref.child("users")
    .child("1")
    .rx
    .observeEvent(.value)
    .subscribe(onNext: { snapshot in
        print("Value:\(snapshot.value)")
    }).disposed(by: disposeBag)
    
// https://firebase.google.com/docs/database/ios/read-and-write#listen_for_value_events

Read data once:

let ref = Database.database().reference()

ref.child("users")
    .child("1")
    .rx
    .observeSingleEvent(.value)
    .subscribe(onNext: { snapshot in
        print("Value:\(snapshot.value)")
    }).disposed(by: disposeBag)
    
// https://firebase.google.com/docs/database/ios/read-and-write#read_data_once

Update specific fields:

let ref = Database.database().reference()

let childUpdates = ["/posts/\(key)": post,
                    "/user-posts/\(userID)/\(key)/": post]
ref.rx.updateChildValues(childUpdates)
    .subscribe(onNext: { _ in
        // Success
    }).disposed(by: disposeBag)

// https://firebase.google.com/docs/database/ios/read-and-write#update_specific_fields

Delete data:

let ref = Database.database().reference()

ref.rx.removeValue()
    .subscribe(onNext: { _ in
        // Success
    }).disposed(by: disposeBag)
    
// https://firebase.google.com/docs/database/ios/read-and-write#delete_data

Save data as transactions

let ref = Database.database().reference()

ref.rx.runTransactionBlock { currentData in
        // TransactionResult
    }.subscribe(onNext: { _ in
        // Success
    }).disposed(by: disposeBag)
    
// https://firebase.google.com/docs/database/ios/read-and-write#save_data_as_transactions

Firestore

Setting data:

let db = Firestore.firestore()

// Add a new document in collection "cities"
db.collection("cities")
    .document("SF")
    .rx
    .setData([
        "name": "San Francisco",
        "state": "CA",
        "country": "USA",
        "capital": false,
        "population": 860000
        ]).subscribe(onError: { error in
            print("Error setting data: \(error)")
        }).disposed(by: disposeBag)
       
// Add a new document with a generated id.
db.collection("cities")
    .rx
    .addDocument(data: [
        "name": "San Francisco",
        "state": "CA",
        "country": "USA",
        "capital": false,
        "population": 860000
        ]).subscribe(onNext: { ref in
            print("Document added with ID: \(ref.documentID)")
        }, onError: { error in
            print("Error adding document: \(error)")
        }).disposed(by: disposeBag)
        
// Set the "capital" field of the city 'SF'
db.collection("cities")
    .document("SF")
    .rx
    .updateData([
        "capital": true
        ]).subscribe(onNext: {
            print("Document successfully updated")
        }, onError: { error in
            print("Error updating document: \(error)")
        }).disposed(by: disposeBag)
        
// https://firebase.google.com/docs/firestore/manage-data/add-data

Get a document:

let db = Firestore.firestore()

db.collection("cities")
    .document("SF")
    .rx
    .getDocument()
    .subscribe(onNext: { document in
        if let document = document {
            print("Document data: \(document.data())")
        } else {
            print("Document does not exist")
        }
    }, onError: { error in
        print("Error fetching snapshots: \(error)")
    }).disposed(by: disposeBag)
    
// https://firebase.google.com/docs/firestore/query-data/get-data

Get Realtime Updates:

let db = Firestore.firestore()

// Document
db.collection("cities")
    .document("SF")
    .rx
    .listen()
    .subscribe(onNext: { document in
        print("Current data: \(document.data())")
    }, onError: { error in
        print("Error fetching snapshots: \(error)")
    }).disposed(by: disposeBag)
    
// Collection
db.collection("cities")
    .rx
    .listen()
    .subscribe(onNext: { snapshot in
        snapshot.documentChanges.forEach { diff in
            if (diff.type == .added) {
                print("New city: \(diff.document.data())")
            }
            if (diff.type == .modified) {
                print("Modified city: \(diff.document.data())")
            }
            if (diff.type == .removed) {
                print("Removed city: \(diff.document.data())")
            }
        }
    }, onError: { error in
        print("Error fetching snapshots: \(error)")
    }).disposed(by: disposeBag)

// https://firebase.google.com/docs/firestore/query-data/listen

Batched writes:

let db = Firestore.firestore()

// Get new write batch
let batch = db.batch()

// Update the population of 'SF'
let sfRef = db.collection("cities").document("SF")
batch.updateData(["population": 1000000 ], forDocument: sfRef)

// Commit the batch
batch.rx
    .commit()
    .subscribe(onNext: {
        print("Batch write succeeded.")
    }, onError: { error in
        print("Error writing batch \(error)")
    }).disposed(by: disposeBag)
    
// https://firebase.google.com/docs/firestore/manage-data/transactions

Transactions:

let db = Firestore.firestore()
let sfReference = db.collection("cities").document("SF")

db.rx.runTransaction { transaction in
    let sfDocument = try transaction.getDocument(sfReference)
    
    guard let oldPopulation = sfDocument.data()?["population"] as? Int else {
        let error = NSError(
            domain: "AppErrorDomain",
            code: -1,
            userInfo: [
                NSLocalizedDescriptionKey: "Unable to retrieve population from snapshot \(sfDocument)"
            ]
        )
        throw error
    }
    
    transaction.updateData(["population": oldPopulation + 1], forDocument: sfReference)
    return nil
    }.subscribe(onNext: { _ in
        print("Transaction successfully committed!")
    }, onError: { error in
        print("Transaction failed: \(error)")
    }).disposed(by: disposeBag)
    
    // https://firebase.google.com/docs/firestore/manage-data/transactions

RemoteConfig

Fetch:

// TimeInterval is set to expirationDuration here, indicating the next fetch request will use
// data fetched from the Remote Config service, rather than cached parameter values, if cached
// parameter values are more than expirationDuration seconds old. See Best Practices in the
// README for more information.
RemoteConfig.remoteConfig()
    .rx
    .fetch(withExpirationDuration: TimeInterval(expirationDuration), activateFetched: true)
    .subscribe(onNext: { status in
        print("Config fetched! with success:\(status == .success)")
    }, onError: { error in
        print("Error: \(error)")
    }).disposed(by: disposeBag)

    // https://firebase.google.com/docs/remote-config/ios

Storage

Upload:

let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")
    .rx
    
let data: Data // Upload data
reference.putData(data)
    .subscribe(onNext: { metadata in
        // Success
    }, onError: { error in
        // Uh-oh, an error occurred!
    }).disposed(by: disposeBag)
    

let fileURL: URL // Upload file
reference.putFile(from: fileURL)
    .subscribe(onNext: { metadata in
        // Success
    }, onError: { error in
        // Uh-oh, an error occurred!
    }).disposed(by: disposeBag)

Observe events:

let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")
    .rx

let fileURL: URL // Upload file
let uploadTask = reference.putFile(from: fileURL)

// Listen for state changes
task.rx.observe(.progress)
    .subscribe(onNext: { snapshot in
        // Upload reported progress
        let percentComplete = 100.0 * Double(snapshot.progress!.completedUnitCount)
        / Double(snapshot.progress!.totalUnitCount)
    }, onError: { error in
        // Uh-oh, an error occurred!
    }).disposed(by: disposeBag)

Download:

let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")
    .rx

// Download in memory with a maximum allowed size of 1MB (1 * 1024 * 1024 bytes)
reference.getData(maxSize: 1 * 1024 * 1024)
    .subscribe(onNext: { data in
        // Data for "images/space.jpg" is returned
    }, onError: { error in
        // Uh-oh, an error occurred!
    }).disposed(by: disposeBag)
    
    
    
// Create local filesystem URL
let localURL = URL(string: "path/to/image")!
    
// Download to the local filesystem
reference.write(toFile: localURL)
    .subscribe(onNext: { data in
        // Local file URL for "images/space.jpg" is returned
    }, onError: { error in
        // Uh-oh, an error occurred!
    }).disposed(by: disposeBag)

URL:

let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")
    .rx
    
// Fetch the download URL
reference.downloadURL()
    .subscribe(onNext: { url in
        // Get the download URL for 'images/space.jpg'
    }, onError: { error in
        // Handle any errors
    }).disposed(by: disposeBag)

Metadata:

let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")
    .rx
    
// Create file metadata to update
let newMetadata = StorageMetadata()
    
// Update metadata properties
reference.updateMetadata(newMetadata)
    .subscribe(onNext: { metadata in
        // Updated metadata for 'images/space.jpg' is returned
    }, onError: { error in
        // Uh-oh, an error occurred!
    }).disposed(by: disposeBag)
    
    
// Get metadata properties
reference.getMetadata()
    .subscribe(onNext: { metadata in
        // Metadata now contains the metadata for 'images/space.jpg'
    }, onError: { error in
        // Uh-oh, an error occurred!
    }).disposed(by: disposeBag)

Delete:

let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")
    .rx
    
// Delete the file
reference.delete()
    .subscribe(onNext: {
        // File deleted successfully
    }, onError: { error in
        // Uh-oh, an error occurred!
    }).disposed(by: disposeBag)

Auth

License

This library belongs to RxSwiftCommunity.

RxFirebase is available under the MIT license. See the LICENSE file for more info.