Implement api connection

Author: Nino Handler

SharedCode/build.gradle.kts

@@ -2,6 +2,7 @@ import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTarget
 
 plugins {
     kotlin("multiplatform")
+    id("kotlinx-serialization")
 }
 
 kotlin {
@@ -23,18 +24,54 @@ kotlin {
     jvm("android")
 
     sourceSets["commonMain"].dependencies {
+        // Kotlin
         implementation("org.jetbrains.kotlin:kotlin-stdlib-common")
+
+        // Coroutines
+        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core-common:1.3.3")
+
+        // Ktor
         implementation("io.ktor:ktor-client-core:1.3.0-rc2")
+        implementation("io.ktor:ktor-client-json:1.3.0-rc2")
+        implementation("io.ktor:ktor-client-logging:1.3.0-rc2")
+        implementation("io.ktor:ktor-client-serialization:1.3.0-rc2")
+
+        // Serialization
         implementation("org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:0.14.0")
     }
 
     sourceSets["androidMain"].dependencies {
+        // Kotlin
         implementation("org.jetbrains.kotlin:kotlin-stdlib")
+
+        // Coroutines
+        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.3")
+        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3")
+
+        // Serialization
         implementation("org.jetbrains.kotlinx:kotlinx-serialization-runtime:0.14.0")
+
+        // Ktor
+        implementation ("io.ktor:ktor-client-android:1.3.0-rc2")
+        implementation ("io.ktor:ktor-client-core-jvm:1.3.0-rc2")
+        implementation ("io.ktor:ktor-client-json-jvm:1.3.0-rc2")
+        implementation ("io.ktor:ktor-client-logging-jvm:1.3.0-rc2")
+        implementation ("io.ktor:ktor-client-serialization-jvm:1.3.0-rc2")
     }
 
     sourceSets["iosMain"].dependencies {
+        // Coroutines
+        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core-native:1.3.3")
+
+        // Serialization
         implementation("org.jetbrains.kotlinx:kotlinx-serialization-runtime-native:0.14")
+
+        // Ktor
+        implementation ("io.ktor:ktor-client-ios:1.3.0-rc2")
+        implementation ("io.ktor:ktor-client-core-native:1.3.0-rc2")
+        implementation ("io.ktor:ktor-client-json-native:1.3.0-rc2")
+        implementation ("io.ktor:ktor-client-logging-native:1.3.0-rc2")
+        implementation ("io.ktor:ktor-client-serialization-native:1.3.0-rc2")
     }
 }
 
@@ -58,10 +95,12 @@ val packForXcode by tasks.creating(Sync::class) {
     /// generate a helpful ./gradlew wrapper with embedded Java path
     doLast {
         val gradlew = File(targetDir, "gradlew")
-        gradlew.writeText("#!/bin/bash\n"
-                + "export 'JAVA_HOME=${System.getProperty("java.home")}'\n"
-                + "cd '${rootProject.rootDir}'\n"
-                + "./gradlew \$@\n")
+        gradlew.writeText(
+            "#!/bin/bash\n"
+                    + "export 'JAVA_HOME=${System.getProperty("java.home")}'\n"
+                    + "cd '${rootProject.rootDir}'\n"
+                    + "./gradlew \$@\n"
+        )
         gradlew.setExecutable(true)
     }
 }

SharedCode/src/commonMain/kotlin/Repository.kt

@@ -0,0 +1,17 @@
+package de.handler.mpp.mobile
+
+import kotlinx.serialization.UnstableDefault
+
+@UnstableDefault
+object Repository {
+    private val service = Service()
+    private val astronauts = mutableListOf<Astronaut>()
+
+    suspend fun fetchPeople(forceNetwork: Boolean = false): List<Astronaut> {
+        if (astronauts.isEmpty() || forceNetwork) {
+            astronauts.clear()
+            astronauts.addAll(service.fetchPeople().people)
+        }
+        return astronauts
+    }
+}

SharedCode/src/commonMain/kotlin/Service.kt

@@ -1,7 +1,33 @@
 package de.handler.mpp.mobile
 
-import io.ktor.client.engine.HttpClientEngine
+import io.ktor.client.HttpClient
+import io.ktor.client.features.json.JsonFeature
+import io.ktor.client.features.json.serializer.KotlinxSerializer
+import io.ktor.client.request.get
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.UnstableDefault
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonConfiguration
 
-class TodoApiClient(httpClientEngine: HttpClientEngine? = null) {
+@Serializable
+data class AstronautWrapper(val number: Int, val people: List<Astronaut>)
 
+@Serializable
+data class Astronaut(val craft: String, val name: String)
+
+@UnstableDefault
+class Service {
+    private val baseUrl = "http://api.open-notify.org/astros.json"
+
+    private val client by lazy {
+        HttpClient {
+            install(JsonFeature) {
+                serializer = KotlinxSerializer(Json(JsonConfiguration(strictMode = false)))
+            }
+        }
+    }
+
+    suspend fun fetchPeople(): AstronautWrapper {
+        return client.get(baseUrl)
+    }
 }

build.gradle

@@ -22,5 +22,4 @@ allprojects {
 
 task clean(type: Delete) {
     delete rootProject.buildDir
-}
-apply plugin: 'kotlinx-serialization'
+}