Attributed metrics module and skeleton

app/build.gradle

@@ -409,6 +409,9 @@ dependencies {
     implementation project(':survey-api')
     implementation project(':survey-impl')
 
+    implementation project(':attributed-metrics-api')
+    implementation project(':attributed-metrics-impl')
+
     implementation project(':breakage-reporting-impl')
 
     implementation project(':dax-prompts-api')

attributed-metrics/attributed-metrics-api/build.gradle

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2024 DuckDuckGo
+ *
+ * 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.
+ */
+
+plugins {
+    id 'java-library'
+    id 'kotlin'
+}
+
+apply from: "$rootProject.projectDir/code-formatting.gradle"
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
+}
+
+kotlin {
+    jvmToolchain(17)
+}
+
+dependencies {
+    implementation Kotlin.stdlib.jdk7
+    implementation KotlinX.coroutines.core
+}

attributed-metrics/attributed-metrics-api/src/main/java/com/duckduckgo/app/attributed/metrics/api/AttributedMetricsClient.kt

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2025 DuckDuckGo
+ *
+ * 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.
+ */
+
+package com.duckduckgo.app.attributed.metrics.api
+
+/**
+ * Client for collecting and emitting attributed metrics.
+ */
+interface AttributedMetricClient {
+    /**
+     * Stores an event occurrence for later analysis.
+     * Does nothing if the client is not active.
+     *
+     * @param eventName Name of the event to collect
+     */
+    fun collectEvent(eventName: String)
+
+    /**
+     * Calculates statistics for a specific event over a time period.
+     * Returns zero stats if the client is not active.
+     *
+     * @param eventName Name of the event to analyze
+     * @param days Number of days to look back
+     * @return Statistics about the event's occurrences
+     */
+    suspend fun getEventStats(
+        eventName: String,
+        days: Int,
+    ): EventStats
+
+    /**
+     * Emits a metric with its parameters if the client is active.
+     * Does nothing if the client is not active.
+     *
+     * @param metric The metric to emit
+     */
+    fun emitMetric(metric: AttributedMetric)
+}
+
+/**
+ * Statistics about collected events over a time period.
+ *
+ * @property daysWithEvents Number of days that had at least one event
+ * @property rollingAverage Average number of events per day over the period
+ * @property totalEvents Total number of events in the period
+ */
+data class EventStats(
+    val daysWithEvents: Int,
+    val rollingAverage: Double,
+    val totalEvents: Int,
+)
+
+/**
+ * Interface for defining an attributed metric.
+ * Each metric implementation should provide its name and parameters.
+ */
+interface AttributedMetric {
+    /**
+     * @return The name used to identify this metric
+     */
+    fun getPixelName(): String
+
+    /**
+     * @return Parameters to be included with this metric
+     */
+    suspend fun getMetricParameters(): Map<String, String>
+}

attributed-metrics/attributed-metrics-impl/build.gradle

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2024 DuckDuckGo
+ *
+ * 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.
+ */
+
+plugins {
+    id 'com.android.library'
+    id 'kotlin-android'
+    id 'com.google.devtools.ksp'
+    id 'com.squareup.anvil'
+}
+
+apply from: "$rootProject.projectDir/gradle/android-library.gradle"
+
+dependencies {
+    anvil project(path: ':anvil-compiler')
+
+    implementation project(path: ':anvil-annotations')
+    implementation project(path: ':attributed-metrics-api')
+    implementation project(path: ':common-utils')
+    implementation project(path: ':di')
+    implementation project(path: ':app-build-config-api')
+    implementation project(path: ':statistics-api')
+
+    implementation KotlinX.coroutines.core
+    implementation KotlinX.coroutines.android
+
+    implementation Google.dagger
+
+    // DataStore
+    api AndroidX.dataStore.preferences
+
+    // Room
+    implementation AndroidX.room.ktx
+    ksp AndroidX.room.compiler
+
+    implementation "com.squareup.logcat:logcat:_"
+
+    implementation AndroidX.core.ktx
+
+    testImplementation Testing.junit4
+    testImplementation "org.mockito.kotlin:mockito-kotlin:_"
+    testImplementation "androidx.lifecycle:lifecycle-runtime-testing:_"
+    testImplementation project(path: ':common-test')
+    testImplementation project(':data-store-test')
+    testImplementation project(':feature-toggles-test')
+    testImplementation CashApp.turbine
+    testImplementation Testing.robolectric
+    testImplementation(KotlinX.coroutines.test) {
+        // https://github.com/Kotlin/kotlinx.coroutines/issues/2023
+        // conflicts with mockito due to direct inclusion of byte buddy
+        exclude group: "org.jetbrains.kotlinx", module: "kotlinx-coroutines-debug"
+    }
+    testImplementation AndroidX.test.ext.junit
+    testImplementation AndroidX.archCore.testing
+    testImplementation AndroidX.room.testing
+    testImplementation AndroidX.room.rxJava2
+
+    androidTestImplementation AndroidX.test.runner
+    androidTestImplementation AndroidX.test.rules
+
+    coreLibraryDesugaring Android.tools.desugarJdkLibs
+}
+
+android {
+    anvil {
+        generateDaggerFactories = true // default is false
+    }
+    lintOptions {
+        baseline file("lint-baseline.xml")
+        abortOnError = !project.hasProperty("abortOnError") || project.property("abortOnError") != "false"
+    }
+    namespace 'com.duckduckgo.app.attributed.metrics'
+    compileOptions {
+        coreLibraryDesugaringEnabled = true
+    }
+    buildFeatures {
+        buildConfig = true
+    }
+}

attributed-metrics/attributed-metrics-impl/lint-baseline.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<issues format="6" by="lint 8.8.2" type="baseline" client="gradle" dependencies="false" name="AGP (8.7.3)" variant="all" version="8.8.2">
+
+</issues>

attributed-metrics/attributed-metrics-impl/src/main/java/com/duckduckgo/app/attributed/metrics/AttributedMetricsConfigFeature.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2025 DuckDuckGo
+ *
+ * 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.
+ */
+
+package com.duckduckgo.app.attributed.metrics
+
+import com.duckduckgo.anvil.annotations.ContributesRemoteFeature
+import com.duckduckgo.di.scopes.AppScope
+import com.duckduckgo.feature.toggles.api.Toggle
+import com.duckduckgo.feature.toggles.api.Toggle.DefaultFeatureValue
+
+@ContributesRemoteFeature(
+    scope = AppScope::class,
+    featureName = "attributedMetrics",
+)
+interface AttributedMetricsConfigFeature {
+    @Toggle.DefaultValue(DefaultFeatureValue.INTERNAL)
+    fun self(): Toggle
+}

attributed-metrics/attributed-metrics-impl/src/main/java/com/duckduckgo/app/attributed/metrics/di/AttributedMetricsDataStoreModule.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2024 DuckDuckGo
+ *
+ * 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.
+ */
+
+package com.duckduckgo.app.attributed.metrics.di
+
+import android.content.Context
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.preferencesDataStoreFile
+import com.duckduckgo.di.scopes.AppScope
+import com.squareup.anvil.annotations.ContributesTo
+import dagger.Module
+import dagger.Provides
+import dagger.SingleInstanceIn
+import javax.inject.Qualifier
+
+@Module
+@ContributesTo(AppScope::class)
+object AttributedMetricsDataStoreModule {
+    @Provides
+    @SingleInstanceIn(AppScope::class)
+    @AttributedMetrics
+    fun provideDataStore(context: Context): DataStore<Preferences> =
+        PreferenceDataStoreFactory.create(
+            produceFile = { context.preferencesDataStoreFile("attributed_metrics_v1") },
+        )
+}
+
+@Qualifier
+@Retention(AnnotationRetention.BINARY)
+annotation class AttributedMetrics

attributed-metrics/attributed-metrics-impl/src/main/java/com/duckduckgo/app/attributed/metrics/di/AttributedMetricsDatabaseModule.kt

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2024 DuckDuckGo
+ *
+ * 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.
+ */
+
+package com.duckduckgo.app.attributed.metrics.di
+
+import android.content.Context
+import androidx.room.Room
+import com.duckduckgo.app.attributed.metrics.store.AttributedMetricsDatabase
+import com.duckduckgo.app.attributed.metrics.store.EventDao
+import com.duckduckgo.di.scopes.AppScope
+import com.squareup.anvil.annotations.ContributesTo
+import dagger.Module
+import dagger.Provides
+import dagger.SingleInstanceIn
+
+@Module
+@ContributesTo(AppScope::class)
+class AttributedMetricsDatabaseModule {
+    @Provides
+    @SingleInstanceIn(AppScope::class)
+    fun provideAttributedMetricsDatabase(context: Context): AttributedMetricsDatabase =
+        Room
+            .databaseBuilder(
+                context = context,
+                klass = AttributedMetricsDatabase::class.java,
+                name = "attributed_metrics.db",
+            ).fallbackToDestructiveMigration()
+            .build()
+
+    @Provides
+    @SingleInstanceIn(AppScope::class)
+    fun provideEventDao(db: AttributedMetricsDatabase): EventDao = db.eventDao()
+}