Merge pull request #230 from TelemetryDeck/feature/new-user

Introduce automatic session tracking & enhance default parameters (targeting `main`)

.swiftlint.yml

@@ -5,6 +5,7 @@ disabled_rules: # rule identifiers turned on by default to exclude from running
   - trailing_comma
   - function_parameter_count
   - closure_parameter_position
+  - nesting
 opt_in_rules: # some rules are turned off by default, so you need to opt-in
   - empty_count # Find all the available rules by running: `swiftlint rules`
 

Sources/TelemetryDeck/Helpers/SessionManager.swift

@@ -0,0 +1,265 @@
+#if canImport(WatchKit)
+import WatchKit
+#elseif canImport(UIKit)
+import UIKit
+#elseif canImport(AppKit)
+import AppKit
+#endif
+
+@available(watchOS 7, *)
+final class SessionManager: @unchecked Sendable {
+    private struct StoredSession: Codable {
+        let startedAt: Date
+        var durationInSeconds: Int
+
+        // Let's save some extra space in UserDefaults by using shorter keys.
+        private enum CodingKeys: String, CodingKey {
+            case startedAt = "st"
+            case durationInSeconds = "dn"
+        }
+    }
+
+    static let shared = SessionManager()
+
+    private static let recentSessionsKey = "recentSessions"
+    private static let deletedSessionsCountKey = "deletedSessionsCount"
+
+    private static let firstSessionDateKey = "firstSessionDate"
+    private static let distinctDaysUsedKey = "distinctDaysUsed"
+
+    private static let decoder: JSONDecoder = {
+        let decoder = JSONDecoder()
+        decoder.dateDecodingStrategy = .secondsSince1970
+        return decoder
+    }()
+
+    private static let encoder: JSONEncoder = {
+        let encoder = JSONEncoder()
+        // removes sub-second level precision from the start date as we don't need it
+        encoder.dateEncodingStrategy = .custom { date, encoder in
+            let timestamp = Int(date.timeIntervalSince1970)
+            var container = encoder.singleValueContainer()
+            try container.encode(timestamp)
+        }
+        return encoder
+    }()
+
+    private var recentSessions: [StoredSession]
+
+    private var deletedSessionsCount: Int {
+        get { TelemetryDeck.customDefaults?.integer(forKey: Self.deletedSessionsCountKey) ?? 0 }
+        set {
+            self.persistenceQueue.async {
+                TelemetryDeck.customDefaults?.set(newValue, forKey: Self.deletedSessionsCountKey)
+            }
+        }
+    }
+
+    var totalSessionsCount: Int {
+        self.recentSessions.count + self.deletedSessionsCount
+    }
+
+    var averageSessionSeconds: Int {
+        guard self.recentSessions.count > 1 else {
+            return self.recentSessions.first?.durationInSeconds ?? -1
+        }
+
+        let completedSessions = self.recentSessions.dropLast()
+        let totalCompletedSessionSeconds = completedSessions.map(\.durationInSeconds).reduce(into: 0) { $0 += $1 }
+        return totalCompletedSessionSeconds / completedSessions.count
+    }
+
+    var previousSessionSeconds: Int? {
+        self.recentSessions.dropLast().last?.durationInSeconds
+    }
+
+    var firstSessionDate: String {
+        get {
+            TelemetryDeck.customDefaults?.string(forKey: Self.firstSessionDateKey)
+                ?? ISO8601DateFormatter.string(from: Date(), timeZone: .current, formatOptions: [.withFullDate])
+        }
+        set {
+            self.persistenceQueue.async {
+                TelemetryDeck.customDefaults?.set(newValue, forKey: Self.firstSessionDateKey)
+            }
+        }
+    }
+
+    var distinctDaysUsed: [String] {
+        get { TelemetryDeck.customDefaults?.stringArray(forKey: Self.distinctDaysUsedKey) ?? [] }
+        set {
+            self.persistenceQueue.async {
+                TelemetryDeck.customDefaults?.set(newValue, forKey: Self.distinctDaysUsedKey)
+            }
+        }
+    }
+
+    private var currentSessionStartedAt: Date = .distantPast
+    private var currentSessionDuration: TimeInterval = .zero
+
+    private var sessionDurationUpdater: Timer?
+    private var sessionDurationLastUpdatedAt: Date?
+
+    private let persistenceQueue = DispatchQueue(label: "com.telemetrydeck.sessionmanager.persistence")
+
+    private init() {
+        if
+            let existingSessionData = TelemetryDeck.customDefaults?.data(forKey: Self.recentSessionsKey),
+            let existingSessions = try? Self.decoder.decode([StoredSession].self, from: existingSessionData)
+        {
+            // upon app start, clean up any sessions older than 90 days to keep dict small
+            let cutoffDate = Date().addingTimeInterval(-(90 * 24 * 60 * 60))
+            self.recentSessions = existingSessions.filter { $0.startedAt > cutoffDate }
+
+            // Update deleted sessions count
+            self.deletedSessionsCount += existingSessions.count - self.recentSessions.count
+        } else {
+            self.recentSessions = []
+        }
+
+        self.updateDistinctDaysUsed()
+        self.setupAppLifecycleObservers()
+    }
+
+    func startNewSession() {
+        // stop automatic duration counting of previous session
+        self.stopSessionTimer()
+
+        // if the recent sessions are empty, this must be the first start after installing the app
+        if self.recentSessions.isEmpty {
+            // this ensures we only use the date, not the time –> e.g. "2025-01-31"
+            let todayFormatted = ISO8601DateFormatter.string(from: Date(), timeZone: .current, formatOptions: [.withFullDate])
+
+            self.firstSessionDate = todayFormatted
+
+            TelemetryDeck.internalSignal(
+                "TelemetryDeck.Acquisition.newInstallDetected",
+                parameters: ["TelemetryDeck.Acquisition.firstSessionDate": todayFormatted]
+            )
+        }
+
+        // start a new session
+        self.currentSessionStartedAt = Date()
+        self.currentSessionDuration = .zero
+
+        // start automatic duration counting of new session
+        self.updateSessionDuration()
+        self.sessionDurationUpdater = Timer.scheduledTimer(
+            timeInterval: 1,
+            target: self,
+            selector: #selector(updateSessionDuration),
+            userInfo: nil,
+            repeats: true
+        )
+    }
+
+    private func stopSessionTimer() {
+        self.sessionDurationUpdater?.invalidate()
+        self.sessionDurationUpdater = nil
+        self.sessionDurationLastUpdatedAt = nil
+    }
+
+    @objc
+    private func updateSessionDuration() {
+        if let sessionDurationLastUpdatedAt {
+            self.currentSessionDuration += Date().timeIntervalSince(sessionDurationLastUpdatedAt)
+        }
+
+        self.sessionDurationLastUpdatedAt = Date()
+        self.persistCurrentSessionIfNeeded()
+    }
+
+    private func persistCurrentSessionIfNeeded() {
+        // Ignore sessions under 1 second
+        guard self.currentSessionDuration >= 1.0 else { return }
+
+        // Add or update the current session
+        if let existingSessionIndex = self.recentSessions.lastIndex(where: { $0.startedAt == self.currentSessionStartedAt }) {
+            self.recentSessions[existingSessionIndex].durationInSeconds = Int(self.currentSessionDuration)
+        } else {
+            let newSession = StoredSession(startedAt: self.currentSessionStartedAt, durationInSeconds: Int(self.currentSessionDuration))
+            self.recentSessions.append(newSession)
+        }
+
+        // Save changes to UserDefaults without blocking Main thread
+        self.persistenceQueue.async {
+            if let updatedSessionData = try? Self.encoder.encode(self.recentSessions) {
+                TelemetryDeck.customDefaults?.set(updatedSessionData, forKey: Self.recentSessionsKey)
+            }
+        }
+    }
+
+    @objc
+    private func handleDidEnterBackgroundNotification() {
+        self.updateSessionDuration()
+        self.stopSessionTimer()
+    }
+
+    @objc
+    private func handleWillEnterForegroundNotification() {
+        self.updateSessionDuration()
+        self.sessionDurationUpdater = Timer.scheduledTimer(
+            timeInterval: 1,
+            target: self,
+            selector: #selector(updateSessionDuration),
+            userInfo: nil,
+            repeats: true
+        )
+    }
+
+    private func updateDistinctDaysUsed() {
+        let todayFormatted = ISO8601DateFormatter.string(from: Date(), timeZone: .current, formatOptions: [.withFullDate])
+
+        var distinctDays = self.distinctDaysUsed
+        if distinctDays.last != todayFormatted {
+            distinctDays.append(todayFormatted)
+            self.distinctDaysUsed = distinctDays
+        }
+    }
+
+    private func setupAppLifecycleObservers() {
+        #if canImport(WatchKit)
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(handleDidEnterBackgroundNotification),
+            name: WKApplication.didEnterBackgroundNotification,
+            object: nil
+        )
+
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(handleWillEnterForegroundNotification),
+            name: WKApplication.willEnterForegroundNotification,
+            object: nil
+        )
+        #elseif canImport(UIKit)
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(handleDidEnterBackgroundNotification),
+            name: UIApplication.didEnterBackgroundNotification,
+            object: nil
+        )
+
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(handleWillEnterForegroundNotification),
+            name: UIApplication.willEnterForegroundNotification,
+            object: nil
+        )
+        #elseif canImport(AppKit)
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(handleDidEnterBackgroundNotification),
+            name: NSApplication.didResignActiveNotification,
+            object: nil
+        )
+
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(handleWillEnterForegroundNotification),
+            name: NSApplication.willBecomeActiveNotification,
+            object: nil
+        )
+        #endif
+    }
+}

Sources/TelemetryDeck/PirateMetrics/TelemetryDeck+Acquisition.swift

@@ -0,0 +1,45 @@
+import Foundation
+
+extension TelemetryDeck {
+    private static func acquiredUser(
+        channel: String,
+        parameters: [String: String] = [:],
+        customUserID: String? = nil
+    ) {
+        let acquisitionParameters = ["TelemetryDeck.Acquisition.channel": channel]
+
+        self.internalSignal(
+            "TelemetryDeck.Acquisition.userAcquired",
+            parameters: acquisitionParameters.merging(parameters) { $1 },
+            customUserID: customUserID
+        )
+    }
+
+    private static func leadStarted(
+        leadID: String,
+        parameters: [String: String] = [:],
+        customUserID: String? = nil
+    ) {
+        let leadParameters: [String: String] = ["TelemetryDeck.Acquisition.leadID": leadID]
+
+        self.internalSignal(
+            "TelemetryDeck.Acquisition.leadStarted",
+            parameters: leadParameters.merging(parameters) { $1 },
+            customUserID: customUserID
+        )
+    }
+
+    private static func leadConverted(
+        leadID: String,
+        parameters: [String: String] = [:],
+        customUserID: String? = nil
+    ) {
+        let leadParameters: [String: String] = ["TelemetryDeck.Acquisition.leadID": leadID]
+
+        self.internalSignal(
+            "TelemetryDeck.Acquisition.leadConverted",
+            parameters: leadParameters.merging(parameters) { $1 },
+            customUserID: customUserID
+        )
+    }
+}

Sources/TelemetryDeck/PirateMetrics/TelemetryDeck+Activation.swift

@@ -0,0 +1,32 @@
+import Foundation
+
+extension TelemetryDeck {
+    private static func onboardingCompleted(
+        parameters: [String: String] = [:],
+        customUserID: String? = nil
+    ) {
+        let onboardingParameters: [String: String] = [:]
+
+        self.internalSignal(
+            "TelemetryDeck.Activation.onboardingCompleted",
+            parameters: onboardingParameters.merging(parameters) { $1 },
+            customUserID: customUserID
+        )
+    }
+
+    private static func coreFeatureUsed(
+        featureName: String,
+        parameters: [String: String] = [:],
+        customUserID: String? = nil
+    ) {
+        let featureParameters = [
+            "TelemetryDeck.Activation.featureName": featureName
+        ]
+
+        self.internalSignal(
+            "TelemetryDeck.Activation.coreFeatureUsed",
+            parameters: featureParameters.merging(parameters) { $1 },
+            customUserID: customUserID
+        )
+    }
+}