Add js support in kotlinx.serialization feature

    Close #666

build.gradle

@@ -21,6 +21,7 @@ buildscript {
         classpath "org.jetbrains.kotlin:kotlin-native-gradle-plugin:$kotlin_native_version"
         classpath "org.jetbrains.kotlinx:atomicfu-gradle-plugin:$atomic_fu_version"
         classpath "com.moowork.gradle:gradle-node-plugin:$gradle_node_version"
+        classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
     }
 }
 

gradle/js.gradle

@@ -100,10 +100,12 @@ prepareMochaChrome.doLast {
         <script src="$projectDir/build/web/kotlinx-coroutines-core.js"></script>
         <script src="$projectDir/build/web/kotlinx-io-js.js"></script>
         <script src="$projectDir/build/web/kotlinx-coroutines-io-js.js"></script>
+        <script src="$projectDir/build/web/kotlinx-serialization-runtime-js.js"></script>
         <script src="$projectDir/build/web/ktor-utils-js.js"></script>
         <script src="$projectDir/build/web/ktor-http-js.js"></script>
         <script src="$projectDir/build/web/ktor-client-core-js.js"></script>
         <script src="$projectDir/build/web/ktor-client-js.js"></script>
+        <script src="$projectDir/build/web/ktor-client-json-js.js"></script>
         <script src="$compileTestKotlin2Js.outputFile"></script>
         <script>mocha.run();</script>
         </body>
@@ -119,4 +121,3 @@ task testMochaChrome(type: NodeTask, dependsOn: prepareMochaChrome) {
 }
 
 //test.dependsOn testMochaChrome
-

gradle/platform.gradle

@@ -18,7 +18,8 @@ def jsModules = [
         'ktor-client-js',
         'ktor-client-core-js',
         'ktor-http-js',
-        'ktor-utils-js'
+        'ktor-utils-js',
+        'ktor-client-json-js'
 ]
 
 ext.platformOf = { Project project ->

ktor-client/ktor-client-features/build.gradle

@@ -1,5 +1,7 @@
 description = "Ktor client features"
 
+apply plugin: 'kotlinx-serialization'
+
 dependencies {
     compile project(":ktor-client:ktor-client-core:ktor-client-core-jvm")
 }

ktor-client/ktor-client-features/ktor-client-json/ktor-client-json-ios/build.gradle

@@ -1,7 +1,8 @@
+apply plugin: 'kotlinx-serialization'
 
 dependencies {
     expectedBy project(':ktor-client:ktor-client-features:ktor-client-json')
     implementation project(':ktor-client:ktor-client-core:ktor-client-core-ios')
 
     implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-native:$serialization_version"
-}
+}

ktor-client/ktor-client-features/ktor-client-json/ktor-client-json-js/build.gradle

@@ -0,0 +1,8 @@
+apply plugin: 'kotlinx-serialization'
+
+dependencies {
+    expectedBy project(':ktor-client:ktor-client-features:ktor-client-json')
+
+    compile project(':ktor-client:ktor-client-core:ktor-client-core-js')
+    compile "org.jetbrains.kotlinx:kotlinx-serialization-runtime-js:$serialization_version"
+}

ktor-client/ktor-client-features/ktor-client-json/ktor-client-json-js/src/io/ktor/client/features/json/defaultSerializer.kt

@@ -0,0 +1,13 @@
+package io.ktor.client.features.json
+
+import io.ktor.client.features.json.serializer.*
+
+/**
+ * Platform default serializer.
+ *
+ * Uses service loader on jvm.
+ * Consider to add one of the following dependencies:
+ * - ktor-client-gson
+ * - ktor-client-json
+ */
+actual fun defaultSerializer(): JsonSerializer = KotlinxSerializer()

ktor-client/ktor-client-features/ktor-client-json/ktor-client-json-jvm/build.gradle

@@ -1,3 +1,6 @@
+
+apply plugin: 'kotlinx-serialization'
+
 dependencies {
     expectedBy project(':ktor-client:ktor-client-features:ktor-client-json')
 

ktor-client/ktor-client-features/ktor-client-json/test/KotlinxSerializerTest.kt

@@ -0,0 +1,53 @@
+package io.ktor.client.features.json
+
+import io.ktor.client.call.*
+import io.ktor.client.features.json.serializer.*
+import io.ktor.client.response.*
+import io.ktor.http.*
+import io.ktor.http.content.*
+import io.ktor.util.date.*
+import kotlinx.coroutines.*
+import kotlinx.coroutines.io.*
+import kotlinx.serialization.*
+import kotlin.coroutines.*
+import kotlin.jvm.*
+import kotlin.test.*
+
+@Serializable
+internal data class User(val id: Long, val login: String)
+
+class KotlinxSerializerTest {
+
+    @Test
+    fun registerCustomTest() {
+        val serializer = KotlinxSerializer().apply {
+            register(User::class.serializer())
+        }
+
+        val user = User(1, "vasya")
+        val actual = serializer.testWrite(user)
+        assertEquals(" {\"id\":1,\"login\":\"vasya\"}", actual)
+//        assertEquals(user, serializer.testRead(actual))
+    }
+
+    private fun JsonSerializer.testWrite(data: Any): String =
+        (write(data) as? TextContent)?.text ?: error("Failed to get serialized $data")
+
+    private suspend inline fun <reified T : Any> JsonSerializer.testRead(data: String): T {
+        val info = typeInfo<T>()
+
+        val response = object : HttpResponse {
+            override val call: HttpClientCall get() = TODO()
+            override val status: HttpStatusCode get() = TODO()
+            override val version: HttpProtocolVersion get() = TODO()
+            override val requestTime: GMTDate get() = TODO()
+            override val responseTime: GMTDate get() = TODO()
+            override val headers: Headers get() = TODO()
+            override val coroutineContext: CoroutineContext get() = TODO()
+
+            override val content: ByteReadChannel = ByteReadChannel(data)
+        }
+
+        return read(info, response) as T
+    }
+}

settings.gradle

@@ -45,6 +45,7 @@ includeEx ':ktor-client:ktor-client-features:ktor-client-json'
 includeEx ':ktor-client:ktor-client-features:ktor-client-json:ktor-client-json-tests'
 includeEx ':ktor-client:ktor-client-features:ktor-client-json:ktor-client-json-ios'
 includeEx ':ktor-client:ktor-client-features:ktor-client-json:ktor-client-json-jvm'
+includeEx ':ktor-client:ktor-client-features:ktor-client-json:ktor-client-json-js'
 includeEx ':ktor-client:ktor-client-features:ktor-client-json:ktor-client-gson'
 includeEx ':ktor-client:ktor-client-features:ktor-client-json:ktor-client-jackson'
 includeEx ':ktor-client:ktor-client-features:ktor-client-auth-basic'