[Gradle] kgp-idea-proto: Add public API for extras serialisation

KT-55926

libraries/tools/kotlin-gradle-plugin-idea-proto/api/kotlin-gradle-plugin-idea-proto.api

@@ -1,3 +1,8 @@
+public final class org/jetbrains/kotlin/gradle/idea/proto/ExtrasKt {
+	public static final fun Extras (Lorg/jetbrains/kotlin/gradle/idea/serialize/IdeaKotlinSerializationContext;[B)Lorg/jetbrains/kotlin/tooling/core/MutableExtras;
+	public static final fun toByteArray (Lorg/jetbrains/kotlin/tooling/core/Extras;Lorg/jetbrains/kotlin/gradle/idea/serialize/IdeaKotlinSerializationContext;)[B
+}
+
 public final class org/jetbrains/kotlin/gradle/idea/proto/kpm/KpmIdeaProto {
 	public static final fun IdeaKpmProject (Lorg/jetbrains/kotlin/gradle/idea/serialize/IdeaKotlinSerializationContext;Ljava/io/InputStream;)Lorg/jetbrains/kotlin/gradle/idea/kpm/IdeaKpmProject;
 	public static final fun IdeaKpmProject (Lorg/jetbrains/kotlin/gradle/idea/serialize/IdeaKotlinSerializationContext;Ljava/nio/ByteBuffer;)Lorg/jetbrains/kotlin/gradle/idea/kpm/IdeaKpmProject;

libraries/tools/kotlin-gradle-plugin-idea-proto/src/main/kotlin/org/jetbrains/kotlin/gradle/idea/proto/extras.kt

@@ -8,12 +8,28 @@
 package org.jetbrains.kotlin.gradle.idea.proto
 
 import com.google.protobuf.ByteString
+import com.google.protobuf.InvalidProtocolBufferException
 import org.jetbrains.kotlin.gradle.idea.proto.generated.IdeaExtrasProto
 import org.jetbrains.kotlin.gradle.idea.proto.generated.ideaExtrasProto
 import org.jetbrains.kotlin.gradle.idea.serialize.IdeaKotlinExtrasSerializer
 import org.jetbrains.kotlin.gradle.idea.serialize.IdeaKotlinSerializationContext
 import org.jetbrains.kotlin.tooling.core.*
 
+fun Extras.toByteArray(context: IdeaKotlinSerializationContext): ByteArray {
+    return context.IdeaExtrasProto(this).toByteArray()
+}
+
+fun IdeaKotlinSerializationContext.Extras(data: ByteArray): MutableExtras? {
+    return try {
+        val proto = IdeaExtrasProto.parseFrom(data)
+        Extras(proto)
+
+    } catch (e: InvalidProtocolBufferException) {
+        logger.error("Failed to deserialize Extras", e)
+        null
+    }
+}
+
 @Suppress("unchecked_cast")
 internal fun IdeaKotlinSerializationContext.IdeaExtrasProto(extras: Extras): IdeaExtrasProto {
     val context = this

libraries/tools/kotlin-gradle-plugin-idea-proto/src/test/kotlin/org/jetbrains/kotlin/gradle/idea/proto/ExtrasSerializationTest.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.idea.proto
+
+import org.jetbrains.kotlin.gradle.idea.testFixtures.tcs.TestIdeaKotlinInstances
+import org.jetbrains.kotlin.tooling.core.MutableExtras
+import org.jetbrains.kotlin.tooling.core.mutableExtrasOf
+import org.jetbrains.kotlin.tooling.core.toMutableExtras
+import kotlin.test.Test
+import kotlin.test.fail
+
+class ExtrasSerializationTest : AbstractSerializationTest<MutableExtras>() {
+    override fun serialize(value: MutableExtras): ByteArray = value.toByteArray(this)
+    override fun deserialize(data: ByteArray): MutableExtras = Extras(data) ?: fail()
+
+    @Test
+    fun `sample - extrasWithIntAndStrings`() = testSerialization(TestIdeaKotlinInstances.extrasWithIntAndStrings.toMutableExtras())
+
+    @Test
+    fun `sample - emptyExtras`() = testSerialization(mutableExtrasOf())
+}