TM-SGNL-iOS/SignalServiceKit/Subscriptions/Donations/CachedBadge.swift
TeleMessage developers dde0620daf initial commit
2025-05-03 12:28:28 -07:00

74 lines
2.7 KiB
Swift

//
// Copyright 2022 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
//
import Foundation
public final class CachedBadge: Equatable {
let badgeLevel: OneTimeBadgeLevel
init(level: OneTimeBadgeLevel) {
self.badgeLevel = level
}
public enum Value: Equatable {
case notFound
case profileBadge(ProfileBadge)
}
// If set, the badge and its assets are populated and ready to use.
private var _cachedValue = AtomicOptional<Value>(nil, lock: .sharedGlobal)
public var cachedValue: Value? { self._cachedValue.get() }
// If set, there's an ongoing request to populate the badge. New callers
// should join this chain to know when the shared request has finished.
private var fetchPromise: Promise<Value>?
public static func == (lhs: CachedBadge, rhs: CachedBadge) -> Bool {
// Cached badges are considered equivalent if the underlying badge has the
// same level. We expect the resulting ProfileBadge to be the same if the
// levels match.
return lhs.badgeLevel == rhs.badgeLevel
}
@discardableResult
public func fetchIfNeeded() -> Promise<Value> {
// Run on a stable queue to avoid race conditions.
return firstly(on: DispatchQueue.main) { () -> Promise<Value> in
// If we already have a cached value, do nothing.
if let cachedValue = self.cachedValue {
return Promise.value(cachedValue)
}
// If we're already fetching, chain onto that fetch.
if let fetchPromise = self.fetchPromise {
return fetchPromise
}
// Otherwise, kick off a new fetch.
let fetchPromise: Promise<Value> = firstly {
DonationSubscriptionManager.getOneTimeBadge(level: self.badgeLevel)
}.then { (profileBadge) -> Promise<Value> in
switch profileBadge {
case .none:
return Promise.value(.notFound)
case .some(let profileBadge):
return Promise.wrapAsync {
try await SSKEnvironment.shared.profileManagerRef.badgeStore.populateAssetsOnBadge(profileBadge)
}.map { _ in
return .profileBadge(profileBadge)
}
}
}.map { (value) -> Value in
self._cachedValue.set(value)
return value
}.ensure {
self.fetchPromise = nil
}
// no need to catch -- network request errors are logged elsewhere
self.fetchPromise = fetchPromise
return fetchPromise
}
}
}