dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/NamedData.kt

@@ -29,4 +29,7 @@ public fun <T : Any> Data<T>.named(name: Name): NamedData<T> = if (this is Named
     NamedDataImpl(name, this.data)
 } else {
     NamedDataImpl(name, this)
-}
+}
+
+public operator fun <T : Any> NamedData<T>.component1(): Name = name
+public operator fun <T : Any> NamedData<T>.component2(): Data<T> = data

dataforge-workspace/build.gradle.kts

@@ -5,16 +5,37 @@ plugins {
 
 kotlin {
     sourceSets {
-        commonMain{
+        commonMain {
             dependencies {
                 api(project(":dataforge-context"))
                 api(project(":dataforge-data"))
                 api(project(":dataforge-io"))
             }
         }
+        jvmMain {
+            dependencies {
+                // TODO include fat jar of lambdarpc
+                api(files("lambdarpc-core-0.0.1.jar"))
+                runtimeOnly("io.grpc:grpc-netty-shaded:1.44.0")
+                api("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.0")
+                api("io.grpc:grpc-protobuf:1.44.0")
+                api("com.google.protobuf:protobuf-java-util:3.19.4")
+                api("com.google.protobuf:protobuf-kotlin:3.19.4")
+                api("io.grpc:grpc-kotlin-stub:1.2.1")
+                api("org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.2")
+                api("org.slf4j:slf4j-simple:1.7.36")
+                api("io.github.microutils:kotlin-logging-jvm:2.1.21")
+            }
+        }
     }
 }
 
-readme{
+kscience {
+    useSerialization {
+        json()
+    }
+}
+
+readme {
     maturity = ru.mipt.npm.gradle.Maturity.EXPERIMENTAL
 }

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Task.kt

@@ -17,6 +17,11 @@ import kotlin.reflect.typeOf
 @Type(TYPE)
 public interface Task<out T : Any> : Described {
 
+    /**
+     * Type of the task result data.
+     */
+    public val resultType: KType
+
     /**
      * Compute a [TaskResult] using given meta. In general, the result is lazy and represents both computation model
      * and a handler for actual result
@@ -55,6 +60,9 @@ public fun <T : Any> Task(
     builder: suspend TaskResultBuilder<T>.() -> Unit,
 ): Task<T> = object : Task<T> {
 
+    override val resultType: KType
+        get() = resultType
+
     override val descriptor: MetaDescriptor? = descriptor
 
     override suspend fun execute(

dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/distributed/ClientWorkspacePlugin.kt

@@ -0,0 +1,31 @@
+package space.kscience.dataforge.workspace.distributed
+
+import io.lambdarpc.utils.Endpoint
+import space.kscience.dataforge.context.AbstractPlugin
+import space.kscience.dataforge.context.PluginTag
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.workspace.Task
+import kotlin.reflect.KType
+
+/**
+ * Plugin that purpose is to communicate with remote plugins.
+ * @param tag Tag og the [ClientWorkspacePlugin] should be equal to the tag of the corresponding remote plugin.
+ * @param endpoint Endpoint of the remote plugin.
+ * @param tasks Enumeration of names of remote tasks and their result types.
+ */
+public abstract class ClientWorkspacePlugin(
+    override val tag: PluginTag,
+    endpoint: Endpoint,
+    vararg tasks: Pair<Name, KType>,
+) : AbstractPlugin() {
+
+    private val tasks: Map<Name, Task<*>> = tasks.associate { (name, type) ->
+        name to RemoteTask<Any>(endpoint, type)
+    }
+
+    override fun content(target: String): Map<Name, Any> =
+        when (target) {
+            Task.TYPE -> tasks
+            else -> emptyMap()
+        }
+}

dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/distributed/RemoteTask.kt

@@ -0,0 +1,36 @@
+package space.kscience.dataforge.workspace.distributed
+
+import io.lambdarpc.dsl.ServiceDispatcher
+import io.lambdarpc.utils.Endpoint
+import kotlinx.coroutines.withContext
+import space.kscience.dataforge.data.DataSet
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.workspace.Task
+import space.kscience.dataforge.workspace.TaskResult
+import space.kscience.dataforge.workspace.Workspace
+import space.kscience.dataforge.workspace.wrapResult
+import kotlin.reflect.KType
+
+/**
+ * Proxy task that communicates with the corresponding remote task.
+ */
+internal class RemoteTask<T : Any>(
+    endpoint: Endpoint,
+    override val resultType: KType,
+    override val descriptor: MetaDescriptor? = null,
+) : Task<T> {
+    private val dispatcher = ServiceDispatcher(ServiceWorkspace.serviceId to endpoint)
+
+    @Suppress("UNCHECKED_CAST")
+    override suspend fun execute(
+        workspace: Workspace,
+        taskName: Name,
+        taskMeta: Meta,
+    ): TaskResult<T> = withContext(dispatcher) {
+        val dataset = ServiceWorkspace.execute(taskName) as LazyDecodableDataSet
+        dataset.finishDecoding(resultType)
+        workspace.wrapResult(dataset as DataSet<T>, taskName, taskMeta)
+    }
+}

dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/distributed/ServiceWorkspace.kt

@@ -0,0 +1,202 @@
+package space.kscience.dataforge.workspace.distributed
+
+import io.ktor.utils.io.core.*
+import io.lambdarpc.coding.Coder
+import io.lambdarpc.coding.CodingContext
+import io.lambdarpc.dsl.LibService
+import io.lambdarpc.dsl.def
+import io.lambdarpc.transport.grpc.Entity
+import io.lambdarpc.transport.serialization.Entity
+import io.lambdarpc.transport.serialization.RawData
+import io.lambdarpc.utils.Address
+import io.lambdarpc.utils.Port
+import io.lambdarpc.utils.toSid
+import kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Deferred
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.asFlow
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.toList
+import kotlinx.coroutines.runBlocking
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.serializer
+import space.kscience.dataforge.context.Context
+import space.kscience.dataforge.context.Global
+import space.kscience.dataforge.context.gather
+import space.kscience.dataforge.data.Data
+import space.kscience.dataforge.data.DataSet
+import space.kscience.dataforge.data.DataTree
+import space.kscience.dataforge.data.Goal
+import space.kscience.dataforge.data.NamedData
+import space.kscience.dataforge.data.await
+import space.kscience.dataforge.data.component1
+import space.kscience.dataforge.data.component2
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.asName
+import space.kscience.dataforge.workspace.Task
+import space.kscience.dataforge.workspace.TaskResult
+import space.kscience.dataforge.workspace.Workspace
+import space.kscience.dataforge.workspace.wrapResult
+import java.nio.charset.Charset
+import kotlin.reflect.KType
+
+/**
+ * Workspace that exposes its tasks for remote clients.
+ */
+public class ServiceWorkspace(
+    address: String = "localhost",
+    port: Int? = null,
+    override val context: Context = Global.buildContext("workspace".asName()),
+    data: DataSet<*> = runBlocking { DataTree<Any> {} },
+    override val targets: Map<String, Meta> = mapOf(),
+) : Workspace, Closeable {
+
+    override val data: TaskResult<*> = wrapResult(data, Name.EMPTY, Meta.EMPTY)
+
+    override val tasks: Map<Name, Task<*>>
+        get() = context.gather(Task.TYPE)
+
+    private val service = LibService(serviceId, address, port) {
+        execute of { name -> println("service = $name"); produce(name, Meta.EMPTY) } // TODO
+    }
+
+    /**
+     * Address this workspace is available on.
+     */
+    public val address: Address = Address(address)
+
+    /**
+     * Port this workspace is available on.
+     */
+    public val port: Port
+        get() = service.port
+
+    /**
+     * Start [ServiceWorkspace] as a service.
+     */
+    public fun start(): Unit = service.start()
+
+    /**
+     * Await termination of the service.
+     */
+    public fun awaitTermination(): Unit = service.awaitTermination()
+
+    /**
+     * Shutdown service.
+     */
+    public fun shutdown(): Unit = service.shutdown()
+
+    override fun close(): Unit = service.shutdown()
+
+    public companion object {
+        internal val serviceId = "d41b95b1-828b-4444-8ff0-6f9c92a79246".toSid()
+        internal val execute by serviceId.def(NameCoder, DataSetCoder)
+    }
+}
+
+private object NameCoder : Coder<Name> {
+    override fun decode(entity: Entity, context: CodingContext): Name {
+        require(entity.hasData()) { "Entity should contain data" }
+        val string = entity.data.toString(Charset.defaultCharset())
+        return Name.parse(string)
+    }
+
+    override fun encode(value: Name, context: CodingContext): Entity =
+        Entity(RawData.copyFrom(value.toString(), Charset.defaultCharset()))
+}
+
+/**
+ * Data class that represents serializable [DataSet].
+ */
+@Serializable
+private data class DataSetPrototype(
+    val data: Map<String, String>,
+)
+
+/**
+ * [DataSetPrototype] builder.
+ */
+private fun <T : Any> DataSet<T>.toPrototype(): DataSetPrototype = runBlocking {
+    val serializer = serializer(dataType)
+    val map = mutableListOf<Pair<String, String>>()
+    flowData().map { (name, data) ->
+        name.toString() to Json.encodeToString(serializer, data.await())
+    }.toList(map)
+    DataSetPrototype(map.associate { it })
+}
+
+/**
+ * Trivial [Data] implementation.
+ */
+private class SimpleData(override val type: KType, val data: Any) : Data<Any> {
+    override val meta: Meta
+        get() = Meta.EMPTY
+    override val dependencies: Collection<Goal<*>>
+        get() = emptyList()
+    override val deferred: Deferred<Any>
+        get() = CompletableDeferred(data)
+
+    override fun async(coroutineScope: CoroutineScope): Deferred<Any> = deferred
+    override fun reset() = Unit
+}
+
+/**
+ * Trivial named data implementation.
+ */
+private class SimpleNamedData(
+    override val name: Name,
+    override val data: Data<Any>,
+) : NamedData<Any>, Data<Any> by data
+
+/**
+ * Represents [DataSet] that should be initialized before usage.
+ */
+internal interface LazyDecodableDataSet<T : Any> : DataSet<T> {
+    fun finishDecoding(type: KType)
+}
+
+/**
+ * Trivial [LazyDecodableDataSet] implementation.
+ */
+private class SimpleDataSet(private val prototype: DataSetPrototype) : LazyDecodableDataSet<Any> {
+
+    lateinit var type: KType
+    lateinit var data: Map<Name, Any>
+
+    override fun finishDecoding(type: KType) {
+        this.type = type
+        this.data = prototype.data.map { (name, data) ->
+            Name.parse(name) to Json.decodeFromString(serializer(type), data)
+        }.associate { (name, data) -> name to data!! }
+    }
+
+    override val dataType: KType
+        get() = type
+
+    override fun flowData(): Flow<NamedData<Any>> =
+        data.map { (name, data) ->
+            val wrapped = SimpleData(dataType, data)
+            SimpleNamedData(name, wrapped)
+        }.asFlow()
+
+    override suspend fun getData(name: Name): Data<Any>? = data[name]?.let { data ->
+        SimpleData(dataType, data)
+    }
+}
+
+private object DataSetCoder : Coder<DataSet<Any>> {
+    override fun decode(entity: Entity, context: CodingContext): DataSet<Any> {
+        val string = entity.data.toString(Charset.defaultCharset())
+        val prototype = Json.decodeFromString(serializer<DataSetPrototype>(), string)
+        return SimpleDataSet(prototype)
+    }
+
+    override fun encode(value: DataSet<*>, context: CodingContext): Entity {
+        val prototype = value.toPrototype()
+        val string = Json.encodeToString(serializer(), prototype)
+        return Entity(RawData.copyFrom(string, Charset.defaultCharset()))
+    }
+}

dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/ServiceWorkspaceTest.kt

@@ -0,0 +1,106 @@
+package space.kscience.dataforge.workspace
+
+import io.lambdarpc.utils.Endpoint
+import kotlinx.coroutines.runBlocking
+import org.junit.jupiter.api.AfterAll
+import org.junit.jupiter.api.BeforeAll
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+import space.kscience.dataforge.context.Context
+import space.kscience.dataforge.context.Global
+import space.kscience.dataforge.context.PluginFactory
+import space.kscience.dataforge.context.PluginTag
+import space.kscience.dataforge.data.DataTree
+import space.kscience.dataforge.data.await
+import space.kscience.dataforge.data.getData
+import space.kscience.dataforge.data.map
+import space.kscience.dataforge.data.select
+import space.kscience.dataforge.data.static
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.asName
+import space.kscience.dataforge.workspace.distributed.ClientWorkspacePlugin
+import space.kscience.dataforge.workspace.distributed.ServiceWorkspace
+import kotlin.reflect.KClass
+import kotlin.reflect.typeOf
+import kotlin.test.assertEquals
+
+private class MyPlugin : WorkspacePlugin() {
+    override val tag: PluginTag
+        get() = Factory.tag
+
+    val task by task<Int> {
+        val myInt = workspace.data.select<Int>()
+        val res = myInt.getData("int".asName())!!
+        emit("result".asName(), res.map { it + 1 })
+    }
+
+    companion object Factory : PluginFactory<MyPlugin> {
+        override fun invoke(meta: Meta, context: Context): MyPlugin = MyPlugin()
+
+        override val tag: PluginTag
+            get() = PluginTag("Plg")
+
+        override val type: KClass<out MyPlugin>
+            get() = MyPlugin::class
+    }
+}
+
+private class RemoteMyPlugin(endpoint: Endpoint) : ClientWorkspacePlugin(
+    MyPlugin.tag,
+    endpoint,
+    "task".asName() to typeOf<Int>()
+)
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class ServiceWorkspaceTest {
+
+    private lateinit var worker1: ServiceWorkspace
+    private lateinit var workspace: Workspace
+
+    @BeforeAll
+    fun before() {
+        worker1 = ServiceWorkspace(
+            context = Global.buildContext("worker1".asName()) {
+                plugin(MyPlugin)
+            },
+            data = runBlocking {
+                DataTree<Any> {
+                    static("int", 0)
+                }
+            },
+        )
+        worker1.start()
+
+        workspace = Workspace {
+            context {
+                val endpoint = Endpoint(worker1.address, worker1.port)
+                plugin(RemoteMyPlugin(endpoint))
+            }
+        }
+    }
+
+    @AfterAll
+    fun after() {
+        worker1.shutdown()
+    }
+
+    @Test
+    fun localExecution() = runBlocking {
+        assertEquals(0, worker1.data.getData("int")!!.await())
+        val res = worker1
+            .produce(Name.of("Plg", "task"), Meta.EMPTY)
+            .getData("result".asName())!!
+            .await()
+        assertEquals(1, res)
+    }
+
+    @Test
+    fun remoteExecution() = runBlocking {
+        val remoteRes = workspace
+            .produce(Name.of("Plg", "task"), Meta.EMPTY)
+            .getData("result".asName())!!
+            .await()
+        assertEquals(1, remoteRes)
+    }
+}