Fix auto poll initial config load from cache (#44)

* Fix initial config load when auto poll enabled with results from cache

* Update AutoPollingTests.swift

Author: z4kn4fein

Diff for: ConfigCat.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |spec|
 
   spec.name          = "ConfigCat"
-  spec.version       = "11.0.2"
+  spec.version       = "11.0.3"
   spec.summary       = "ConfigCat Swift SDK"
   spec.swift_version = "5.0"
 

Diff for: ConfigCat.xcconfig

@@ -38,4 +38,4 @@ SUPPORTED_PLATFORMS = macosx iphoneos iphonesimulator watchos watchsimulator app
 SWIFT_VERSION = 5.0
 
 // ConfigCat SDK version
-MARKETING_VERSION = 11.0.2
+MARKETING_VERSION = 11.0.3

Diff for: README.md

@@ -45,7 +45,7 @@ The following device platform versions are supported:
 
   ``` swift
   dependencies: [
-    .package(url: "https://github.com/configcat/swift-sdk", from: "11.0.2")
+    .package(url: "https://github.com/configcat/swift-sdk", from: "11.0.3")
   ]
   ```
 

Diff for: Sources/ConfigCat/ConfigService.swift

@@ -99,28 +99,24 @@ class ConfigService {
     }
 
     func settings(completion: @escaping (SettingsResult) -> Void) {
-        switch pollingMode {
-        case let lazyMode as LazyLoadingMode:
-            fetchIfOlder(threshold: Date().subtract(seconds: lazyMode.cacheRefreshIntervalInSeconds)!) { result in
-                switch result {
-                case .success(let entry): completion(!entry.isEmpty
-                                                     ? SettingsResult(settings: entry.config.settings, fetchTime: entry.fetchTime)
-                                                     : .empty)
-                case .failure(_, let entry): completion(!entry.isEmpty
-                                                        ? SettingsResult(settings: entry.config.settings, fetchTime: entry.fetchTime)
-                                                        : .empty)
-                }
-            }
-        default:
-            fetchIfOlder(threshold: .distantPast, preferCache: initialized) { result in
-                switch result {
-                case .success(let entry): completion(!entry.isEmpty
-                                                     ? SettingsResult(settings: entry.config.settings, fetchTime: entry.fetchTime)
-                                                     : .empty)
-                case .failure(_, let entry): completion(!entry.isEmpty
-                                                        ? SettingsResult(settings: entry.config.settings, fetchTime: entry.fetchTime)
-                                                        : .empty)
-                }
+        var threshold = Date.distantPast
+        var preferCache = initialized
+        if let lazyMode = pollingMode as? LazyLoadingMode {
+            threshold = Date().subtract(seconds: lazyMode.cacheRefreshIntervalInSeconds)!
+            preferCache = false
+        }
+        else if let autoPoll = pollingMode as? AutoPollingMode, !initialized {
+            threshold = Date().subtract(seconds: autoPoll.autoPollIntervalInSeconds)!
+        }
+        
+        fetchIfOlder(threshold: threshold, preferCache: preferCache) { result in
+            switch result {
+            case .success(let entry): completion(!entry.isEmpty
+                                                 ? SettingsResult(settings: entry.config.settings, fetchTime: entry.fetchTime)
+                                                 : .empty)
+            case .failure(_, let entry): completion(!entry.isEmpty
+                                                    ? SettingsResult(settings: entry.config.settings, fetchTime: entry.fetchTime)
+                                                    : .empty)
             }
         }
     }

Diff for: Sources/ConfigCat/Utils.swift

@@ -47,7 +47,7 @@ extension Equatable {
 }
 
 class Constants {
-    static let version: String = "11.0.2"
+    static let version: String = "11.0.3"
     static let configJsonName: String = "config_v6.json"
     static let configJsonCacheVersion: String = "v2"
     static let globalBaseUrl: String = "https://cdn-global.configcat.com"

Diff for: Tests/ConfigCatTests/AutoPollingTests.swift

@@ -210,6 +210,26 @@ class AutoPollingTests: XCTestCase {
 
         XCTAssertEqual(1, engine.requests.count)
     }
+    
+    func testPollsWhenCacheExpired() {
+        let engine = MockEngine()
+        engine.enqueueResponse(response: Response(body: String(format: testJsonFormat, "test1"), statusCode: 200))
+
+        let initValue = String(format: testJsonFormat, "test").asEntryString(date: Date().subtract(seconds: 5)!)
+        let cache = SingleValueCache(initValue: initValue)
+        let mode = PollingModes.autoPoll(autoPollIntervalInSeconds: 2)
+        let fetcher = ConfigFetcher(httpEngine: engine, logger: InternalLogger.noLogger, sdkKey: "", mode: mode.identifier, dataGovernance: .global)
+        let service = ConfigService(log: InternalLogger.noLogger, fetcher: fetcher, cache: cache, pollingMode: mode, hooks: Hooks(), sdkKey: "", offline: false)
+
+        let expectation1 = expectation(description: "wait for settings")
+        service.settings { settingsResult in
+            XCTAssertEqual("test1", settingsResult.settings["fakeKey"]?.value.stringValue)
+            expectation1.fulfill()
+        }
+        wait(for: [expectation1], timeout: 5)
+
+        XCTAssertEqual(1, engine.requests.count)
+    }
 
     func testOnlineOffline() {
         let engine = MockEngine()