feat: Android SDK Testing Relay Client (#70)

package-testing/android-relay/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea
+.DS_Store
+**/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
+.idea
+tmp

package-testing/android-relay/README.md

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+# Eppo SDK Relay App
+
+This app connects to an Eppo Packing Test Runner Server and relays assignment requests to the SDK.
+
+## Running
+
+Build and run the app
+
+```shell
+# Uses default version of the SDK (4.2.0)
+./gradlew installDebug && \
+  adb shell am start -n cloud.eppo.android.sdkrelay/.TestClientActivity 
+```
+
+## Build and run the app with a specific version of the SDK
+SDK_VERSION=4.2.0 ./build-and-run.sh
+
+## Build and run the app with the SDK at a specific Github REF 
+SDK_REF=my/branch/name ./build-and-run.sh

package-testing/android-relay/app/build.gradle.kts

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+import com.android.build.gradle.internal.cxx.configure.gradleLocalProperties
+
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.jetbrains.kotlin.android)
+
+    id("com.ncorti.ktfmt.gradle") version "0.20.1"
+}
+
+val apiKey: String = gradleLocalProperties(
+    project.rootDir,
+    providers
+).getProperty("cloud.eppo.apiKey")
+
+val testRunnerHost: String = System.getenv("TEST_RUNNER_HOST") ?: "http://10.0.2.2"
+val testRunnerPort: String = System.getenv("TEST_RUNNER_PORT")  ?: "3000"
+
+val eppoAPIHost: String = System.getenv("EPPO_API_HOST") ?: "http://10.0.2.2"
+val eppoAPIPort: String = System.getenv("EPPO_API_PORT")  ?: "5000"
+
+
+android {
+    buildFeatures.buildConfig = true
+
+    namespace = "cloud.eppo.android.sdkrelay"
+    compileSdk = 34
+
+    defaultConfig {
+        applicationId = "cloud.eppo.android.sdkrelay"
+        minSdk = 26
+        targetSdk = 34
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        vectorDrawables {
+            useSupportLibrary = true
+        }
+
+        buildConfigField( "String", "API_KEY", "\"" + apiKey + "\"")
+        buildConfigField( "String", "TEST_RUNNER_HOST", "\"" +testRunnerHost+ "\"")
+        buildConfigField( "String", "TEST_RUNNER_PORT", "\"" +testRunnerPort+ "\"")
+        buildConfigField( "String", "EPPO_API_HOST", "\"" +eppoAPIHost+ "\"")
+        buildConfigField( "String", "EPPO_API_PORT", "\"" +eppoAPIPort+ "\"")
+    }
+
+    buildTypes {
+        debug {
+            enableUnitTestCoverage = true
+            enableAndroidTestCoverage = true
+        }
+        release {
+            isMinifyEnabled = true
+            isShrinkResources = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+    buildFeatures {
+        compose = true
+    }
+    composeOptions {
+        kotlinCompilerExtensionVersion = "1.5.1"
+    }
+    packaging {
+        resources {
+            excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
+}
+
+val sdkVersion = System.getenv("SDK_VERSION")  ?: ""
+val sdkRef = System.getenv("SDK_REF")  ?: ""
+
+dependencies {
+    implementation(libs.socketio)
+    implementation(libs.jackson.databind)
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.lifecycle.runtime.ktx)
+    implementation(libs.androidx.activity.compose)
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.androidx.ui)
+    implementation(libs.androidx.ui.graphics)
+    implementation(libs.androidx.ui.tooling.preview)
+    implementation(libs.androidx.material3)
+    implementation(libs.androidx.runtime.livedata)
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.androidx.junit)
+    androidTestImplementation(libs.androidx.espresso.core)
+    androidTestImplementation(platform(libs.androidx.compose.bom))
+    androidTestImplementation(libs.androidx.ui.test.junit4)
+    debugImplementation(libs.androidx.ui.tooling)
+    debugImplementation(libs.androidx.ui.test.manifest)
+
+    if (sdkVersion != "") {
+        implementation("cloud.eppo:android-sdk:${sdkVersion}")
+    } else if (sdkRef  != "") {
+        implementation(project(":android-sdk")) // Requires the repo be cloned prior to building
+    } else {
+        // Default implementation
+        implementation(libs.eppo.android.sdk)
+    }
+}

package-testing/android-relay/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

package-testing/android-relay/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:name=".EppoSdkRelayApplication"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:usesCleartextTraffic="true"
+        tools:targetApi="31">
+        <activity
+            android:name=".TestClientActivity"
+            android:exported="true"
+            android:label="@string/label_automated_test">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

package-testing/android-relay/app/src/main/java/cloud/eppo/android/sdkrelay/EppoSdkRelayApplication.kt

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+package cloud.eppo.android.sdkrelay
+
+import android.app.Application
+
+class EppoSdkRelayApplication : Application() {}

package-testing/android-relay/app/src/main/java/cloud/eppo/android/sdkrelay/SocketHandler.kt

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+package cloud.eppo.android.sdkrelay
+
+import io.socket.client.IO
+import io.socket.client.Socket
+import java.net.URISyntaxException
+
+class SocketHandler {
+
+  private lateinit var _socket: Socket
+  val socket
+    get() = this._socket
+
+  @Synchronized
+  fun setSocket(host: String, port: String) {
+    try {
+      _socket = IO.socket("$host:$port")
+    } catch (_: URISyntaxException) {}
+  }
+
+  @Synchronized
+  fun establishConnection() {
+    _socket.connect()
+  }
+
+  @Synchronized
+  fun closeConnection() {
+    _socket.disconnect()
+    _socket.off()
+  }
+}