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FunctionsComponent.swift
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FunctionsComponent.swift
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import Foundation
import FirebaseAppCheckInterop
import FirebaseAuthInterop
import FirebaseCore
import FirebaseMessagingInterop
// Avoids exposing internal FirebaseCore APIs to Swift users.
@_implementationOnly import FirebaseCoreExtension
@objc(FIRFunctionsProvider)
protocol FunctionsProvider {
@objc func functions(for app: FirebaseApp,
region: String?,
customDomain: String?,
type: AnyClass) -> Functions
// TODO: See if we can avoid the `type` parameter by either making it a `Functions` argument to
// allow subclasses, or avoid it entirely and fix tests. This was done for FunctionsCombineUnit,
// although we may be able to now port to using `@testable` instead of using the mock.
}
@objc(FIRFunctionsComponent) class FunctionsComponent: NSObject, Library, FunctionsProvider {
// MARK: - Private Variables
/// The app associated with all functions instances in this container.
private weak var app: FirebaseApp?
/// A map of active instances, grouped by app. Keys are FirebaseApp names and values are arrays
/// containing all instances of Functions associated with the given app.
private var instances: [String: [Functions]] = [:]
/// Lock to manage access to the instances array to avoid race conditions.
private var instancesLock: os_unfair_lock = .init()
// MARK: - Initializers
required init(app: FirebaseApp) {
self.app = app
}
// MARK: - Library conformance
static func componentsToRegister() -> [Component] {
let appCheckInterop = Dependency(with: AppCheckInterop.self, isRequired: false)
let authInterop = Dependency(with: AuthInterop.self, isRequired: false)
let messagingInterop = Dependency(with: MessagingInterop.self, isRequired: false)
return [Component(FunctionsProvider.self,
instantiationTiming: .lazy,
dependencies: [
appCheckInterop,
authInterop,
messagingInterop,
]) { container, isCacheable in
guard let app = container.app else { return nil }
isCacheable.pointee = true
return self.init(app: app)
}]
}
// MARK: - FunctionsProvider conformance
func functions(for app: FirebaseApp,
region: String?,
customDomain: String?,
type: AnyClass) -> Functions {
os_unfair_lock_lock(&instancesLock)
// Unlock before the function returns.
defer { os_unfair_lock_unlock(&instancesLock) }
if let associatedInstances = instances[app.name] {
for instance in associatedInstances {
// Domains may be nil, so handle with care.
var equalDomains = false
if let instanceCustomDomain = instance.customDomain {
equalDomains = instanceCustomDomain == customDomain
} else {
equalDomains = customDomain == nil
}
// Check if it's a match.
if instance.region == region, equalDomains {
return instance
}
}
}
let newInstance = Functions(app: app,
region: region ?? FunctionsConstants.defaultRegion,
customDomain: customDomain)
let existingInstances = instances[app.name, default: []]
instances[app.name] = existingInstances + [newInstance]
return newInstance
}
}