CustomerInfo: Sendable conformance (#1824)

The type is now immutable, so the compiler ensures it's thread-safe.

For [CSDK-379].
Extracted from #1795 to make it easier to review this in isolation.

[CSDK-379]: https://revenuecats.atlassian.net/browse/CSDK-379?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Sources/Identity/CustomerInfo.swift

@@ -24,13 +24,10 @@ import Foundation
     @objc public let entitlements: EntitlementInfos
 
     /// All *subscription* product identifiers with expiration dates in the future.
-    @objc public var activeSubscriptions: Set<String> { activeKeys(dates: expirationDatesByProductId) }
+    @objc public var activeSubscriptions: Set<String> { self.activeKeys(dates: expirationDatesByProductId) }
 
     /// All product identifiers purchases by the user regardless of expiration.
-    @objc public private(set) lazy var allPurchasedProductIdentifiers: Set<String> = {
-        return Set(self.expirationDatesByProductId.keys)
-            .union(self.nonSubscriptions.map { $0.productIdentifier })
-    }()
+    @objc public let allPurchasedProductIdentifiers: Set<String>
 
     /// Returns the latest expiration date of all products, nil if there are none.
     @objc public var latestExpirationDate: Date? {
@@ -192,14 +189,15 @@ import Foundation
         self.originalPurchaseDate = subscriber.originalPurchaseDate
         self.originalApplicationVersion = subscriber.originalApplicationVersion
         self.managementURL = subscriber.managementUrl
+
+        self.expirationDatesByProductId = Self.extractExpirationDates(subscriber)
+        self.purchaseDatesByProductId = Self.extractPurchaseDates(subscriber)
+        self.allPurchasedProductIdentifiers = Set(self.expirationDatesByProductId.keys)
+            .union(self.nonSubscriptions.map { $0.productIdentifier })
     }
 
-    private lazy var expirationDatesByProductId: [String: Date?] = {
-        return self.extractExpirationDates()
-    }()
-    private lazy var purchaseDatesByProductId: [String: Date?] = {
-        return self.extractPurchaseDates()
-    }()
+    private let expirationDatesByProductId: [String: Date?]
+    private let purchaseDatesByProductId: [String: Date?]
 }
 
 // MARK: - Internal
@@ -233,6 +231,15 @@ extension CustomerInfo: RawDataContainer {
 
 }
 
+#if swift(>=5.7)
+extension CustomerInfo: Sendable {}
+#else
+// `@unchecked` because:
+// - `Date` is not `Sendable` until Swift 5.7
+// - `URL` is not `Sendable` until Swift 5.7
+extension CustomerInfo: @unchecked Sendable {}
+#endif
+
 /// `CustomerInfo`'s `Codable` implementation relies on `Data`
 extension CustomerInfo: Codable {
 
@@ -317,12 +324,12 @@ private extension CustomerInfo {
 
     func isAfterReferenceDate(date: Date) -> Bool { date.timeIntervalSince(self.requestDate) > 0 }
 
-    func extractExpirationDates() -> [String: Date?] {
-        return self.subscriber.subscriptions.mapValues { $0.expiresDate }
+    static func extractExpirationDates(_ subscriber: CustomerInfoResponse.Subscriber) -> [String: Date?] {
+        return subscriber.subscriptions.mapValues { $0.expiresDate }
     }
 
-    func extractPurchaseDates() -> [String: Date?] {
-        return self.subscriber.allTransactionsByProductId.mapValues { $0.purchaseDate }
+    static func extractPurchaseDates(_ subscriber: CustomerInfoResponse.Subscriber) -> [String: Date?] {
+        return subscriber.allTransactionsByProductId.mapValues { $0.purchaseDate }
     }
 
 }

Sources/Purchasing/EntitlementInfo.swift

@@ -43,6 +43,7 @@ import Foundation
 }
 
 extension Store: CaseIterable {}
+extension Store: Sendable {}
 
 extension Store: DefaultValueProvider {
 
@@ -66,6 +67,7 @@ extension Store: DefaultValueProvider {
 }
 
 extension PeriodType: CaseIterable {}
+extension PeriodType: Sendable {}
 
 extension PeriodType: DefaultValueProvider {
 
@@ -76,7 +78,7 @@ extension PeriodType: DefaultValueProvider {
 /**
  The EntitlementInfo object gives you access to all of the information about the status of a user entitlement.
  */
-@objc(RCEntitlementInfo) public class EntitlementInfo: NSObject {
+@objc(RCEntitlementInfo) public final class EntitlementInfo: NSObject {
 
     /**
      The entitlement identifier configured in the RevenueCat dashboard
@@ -243,6 +245,10 @@ extension PeriodType: DefaultValueProvider {
 
 extension EntitlementInfo: RawDataContainer {}
 
+// @unchecked because:
+// - `rawData` is `[String: Any]` which can't be `Sendable`
+extension EntitlementInfo: @unchecked Sendable {}
+
 public extension EntitlementInfo {
 
     /// True if the user has access to this entitlement,
@@ -321,3 +327,11 @@ private extension EntitlementInfo {
     }
 
 }
+
+#if swift(>=5.7)
+extension EntitlementInfo.Contents: Sendable {}
+#else
+// `@unchecked` because:
+// - `Date` is not `Sendable` until Swift 5.7
+extension EntitlementInfo.Contents: @unchecked Sendable {}
+#endif

Sources/Purchasing/EntitlementInfos.swift

@@ -17,7 +17,7 @@ import Foundation
 /**
  This class contains all the entitlements associated to the user.
  */
-@objc(RCEntitlementInfos) public class EntitlementInfos: NSObject {
+@objc(RCEntitlementInfos) public final class EntitlementInfos: NSObject {
     /**
      Dictionary of all EntitlementInfo (``EntitlementInfo``) objects (active and inactive) keyed by entitlement
      identifier. This dictionary can also be accessed by using an index subscript on ``EntitlementInfos``, e.g.
@@ -124,3 +124,5 @@ extension EntitlementInfos {
     }
 
 }
+
+extension EntitlementInfos: Sendable {}

Sources/Purchasing/NonSubscriptionTransaction.swift

@@ -40,3 +40,11 @@ public final class NonSubscriptionTransaction: NSObject {
     }
 
 }
+
+#if swift(>=5.7)
+extension NonSubscriptionTransaction: Sendable {}
+#else
+// `@unchecked` because:
+// - `Date` is not `Sendable` until Swift 5.7
+extension NonSubscriptionTransaction: @unchecked Sendable {}
+#endif

Sources/Purchasing/PurchaseOwnershipType.swift

@@ -35,6 +35,7 @@ import Foundation
 }
 
 extension PurchaseOwnershipType: CaseIterable {}
+extension PurchaseOwnershipType: Sendable {}
 
 extension PurchaseOwnershipType: DefaultValueProvider {