refactoring

dataforge-device-client/src/commonMain/kotlin/hep/dataforge/control/client/sseClient.kt

@@ -1,13 +0,0 @@
-package hep.dataforge.control.client
-
-import io.ktor.client.HttpClient
-import io.ktor.client.call.receive
-import io.ktor.client.request.get
-import io.ktor.client.statement.HttpResponse
-import io.ktor.client.statement.HttpStatement
-import io.ktor.utils.io.ByteReadChannel
-
-suspend fun HttpClient.sse(address: String) = get<HttpStatement>(address).execute { response: HttpResponse ->
-    // Response is not downloaded here.
-    val channel = response.receive<ByteReadChannel>()
-}

dataforge-device-core/src/commonMain/kotlin/hep/dataforge/control/api/Device.kt

@@ -67,14 +67,6 @@ public interface Device : Closeable, ContextAware {
      */
     public suspend fun execute(command: String, argument: MetaItem<*>? = null): MetaItem<*>?
 
-    /**
-     *
-     * A request with binary data or for binary response (or both). This request does not cover basic functionality like
-     * [setProperty], [getProperty] or [execute] and not defined for a generic device.
-     *
-     */
-    public suspend fun respondWithData(request: Envelope): EnvelopeBuilder = error("No binary response defined")
-
     override fun close() {
         scope.cancel("The device is closed")
     }
@@ -84,4 +76,14 @@ public interface Device : Closeable, ContextAware {
     }
 }
 
+public interface ResponderDevice{
+    /**
+     *
+     * A request with binary data or for binary response (or both). This request does not cover basic functionality like
+     * [setProperty], [getProperty] or [execute] and not defined for a generic device.
+     *
+     */
+    public suspend fun respondWithData(request: Envelope): EnvelopeBuilder
+}
+
 public suspend fun Device.execute(name: String, meta: Meta?): MetaItem<*>? = execute(name, meta?.let { MetaItem.NodeItem(it) })

dataforge-device-core/src/commonMain/kotlin/hep/dataforge/control/base/DeviceAction.kt

@@ -3,7 +3,7 @@ package hep.dataforge.control.base
 import hep.dataforge.control.api.ActionDescriptor
 import hep.dataforge.meta.MetaItem
 
-public interface Action {
+public interface DeviceAction {
     public val name: String
     public val descriptor: ActionDescriptor
     public suspend operator fun invoke(arg: MetaItem<*>? = null): MetaItem<*>?

dataforge-device-core/src/commonMain/kotlin/hep/dataforge/control/base/DeviceBase.kt

@@ -19,8 +19,8 @@ public abstract class DeviceBase(override val context: Context) : Device {
 
     private val _properties = HashMap<String, ReadOnlyDeviceProperty>()
     public val properties: Map<String, ReadOnlyDeviceProperty> get() = _properties
-    private val _actions = HashMap<String, Action>()
+    private val _actions = HashMap<String, DeviceAction>()
-    public val actions: Map<String, Action> get() = _actions
+    public val actions: Map<String, DeviceAction> get() = _actions
 
     private val listeners = ArrayList<Pair<Any?, DeviceListener>>(4)
 
@@ -54,7 +54,7 @@ public abstract class DeviceBase(override val context: Context) : Device {
         _properties[name] = property
     }
 
-    internal fun registerAction(name: String, action: Action) {
+    internal fun registerAction(name: String, action: DeviceAction) {
         if (_actions.contains(name)) error("Action with name $name already registered")
         _actions[name] = action
     }
@@ -199,11 +199,11 @@ public abstract class DeviceBase(override val context: Context) : Device {
     /**
      * A stand-alone action
      */
-    private inner class BasicAction(
+    private inner class BasicDeviceAction(
         override val name: String,
         override val descriptor: ActionDescriptor,
         private val block: suspend (MetaItem<*>?) -> MetaItem<*>?,
-    ) : Action {
+    ) : DeviceAction {
         override suspend fun invoke(arg: MetaItem<*>?): MetaItem<*>? =
             withContext(scope.coroutineContext + SupervisorJob(scope.coroutineContext[Job])) {
                 block(arg).also {
@@ -221,8 +221,8 @@ public abstract class DeviceBase(override val context: Context) : Device {
         name: String,
         descriptorBuilder: ActionDescriptor.() -> Unit = {},
         block: suspend (MetaItem<*>?) -> MetaItem<*>?,
-    ): Action {
+    ): DeviceAction {
-        val action = BasicAction(name, ActionDescriptor(name).apply(descriptorBuilder), block)
+        val action = BasicDeviceAction(name, ActionDescriptor(name).apply(descriptorBuilder), block)
         registerAction(name, action)
         return action
     }

dataforge-device-core/src/commonMain/kotlin/hep/dataforge/control/base/actionDelegates.kt

@@ -9,13 +9,13 @@ import kotlin.properties.ReadOnlyProperty
 import kotlin.reflect.KProperty
 
 
-private fun <D : DeviceBase> D.provideAction(): ReadOnlyProperty<D, Action> =
+private fun <D : DeviceBase> D.provideAction(): ReadOnlyProperty<D, DeviceAction> =
     ReadOnlyProperty { _: D, property: KProperty<*> ->
         val name = property.name
         return@ReadOnlyProperty actions[name]!!
     }
 
-public typealias ActionDelegate = ReadOnlyProperty<DeviceBase, Action>
+public typealias ActionDelegate = ReadOnlyProperty<DeviceBase, DeviceAction>
 
 private class ActionProvider<D : DeviceBase>(
     val owner: D,

dataforge-device-core/src/commonMain/kotlin/hep/dataforge/control/controllers/DeviceController.kt

@@ -1,9 +1,6 @@
 package hep.dataforge.control.controllers
 
-import hep.dataforge.control.api.Device
+import hep.dataforge.control.api.*
-import hep.dataforge.control.api.DeviceHub
-import hep.dataforge.control.api.DeviceListener
-import hep.dataforge.control.api.get
 import hep.dataforge.control.controllers.DeviceMessage.Companion.PROPERTY_CHANGED_ACTION
 import hep.dataforge.io.Consumer
 import hep.dataforge.io.Envelope
@@ -77,13 +74,15 @@ public class DeviceController(
                 } else if (target != null && target != deviceTarget) {
                     error("Wrong target name $deviceTarget expected but $target found")
                 } else {
-                    val response = device.respondWithData(request).apply {
+                    if (device is ResponderDevice) {
-                        meta {
+                        val response = device.respondWithData(request).apply {
-                            "target" put request.meta["source"].string
+                            meta {
-                            "source" put deviceTarget
+                                "target" put request.meta["source"].string
+                                "source" put deviceTarget
+                            }
                         }
-                    }
+                        response.seal()
-                    return response.seal()
+                    } else error("Device does not support binary response")
                 }
             } catch (ex: Exception) {
                 DeviceMessage.fail(cause = ex).wrap()
@@ -99,7 +98,7 @@ public class DeviceController(
                 DeviceMessage.ok {
                     targetName = request.sourceName
                     sourceName = deviceTarget
-                    action ="response.${request.action}"
+                    action = "response.${request.action}"
                     val requestKey = request.key
                     val requestValue = request.value
 

dataforge-magix-client/build.gradle.kts

@@ -10,12 +10,13 @@ kotlin {
         commonMain {
             dependencies {
                 implementation(project(":dataforge-device-core"))
+                implementation(project(":ktor-sse"))
                 implementation("io.ktor:ktor-client-core:$ktorVersion")
             }
         }
         jvmMain {
             dependencies {
-
+                implementation("io.ktor:ktor-client-cio:$ktorVersion")
             }
         }
         jsMain {

dataforge-magix-client/src/commonMain/kotlin/hep/dataforge/control/client/MagixClient.kt

@@ -7,18 +7,34 @@ import hep.dataforge.meta.toJson
 import hep.dataforge.meta.toMeta
 import hep.dataforge.meta.wrap
 import io.ktor.client.HttpClient
+import io.ktor.client.call.receive
+import io.ktor.client.request.get
 import io.ktor.client.request.post
+import io.ktor.client.statement.HttpResponse
+import io.ktor.client.statement.HttpStatement
 import io.ktor.http.ContentType
 import io.ktor.http.Url
 import io.ktor.http.contentType
+import io.ktor.utils.io.ByteReadChannel
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
-import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.launch
 import kotlinx.serialization.json.*
+import ru.mipt.npm.io.sse.SseEvent
+import ru.mipt.npm.io.sse.readSseFlow
 import kotlin.coroutines.CoroutineContext
 
+
+private suspend fun HttpClient.readSse(address: String, block: suspend (SseEvent) -> Unit): Job = launch {
+    get<HttpStatement>(address).execute { response: HttpResponse ->
+        // Response is not downloaded here.
+        val channel = response.receive<ByteReadChannel>()
+        val flow = channel.readSseFlow()
+        flow.collect(block)
+    }
+}
+
 /*
 {
   "id":"string|number[optional, but desired]",
@@ -31,14 +47,14 @@ import kotlin.coroutines.CoroutineContext
 }
  */
 
-
 /**
  * Communicate with server in [Magix format](https://github.com/waltz-controls/rfc/tree/master/1)
  */
 public class MagixClient(
     private val manager: DeviceManager,
     private val postUrl: Url,
-    private val inbox: Flow<JsonObject>
+    private val sseUrl: Url
+    //private val inbox: Flow<JsonObject>
 ): CoroutineScope {
 
     override val coroutineContext: CoroutineContext = manager.context.coroutineContext + Job(manager.context.coroutineContext[Job])
@@ -79,7 +95,9 @@ public class MagixClient(
     }
 
     private val respondJob = launch {
-        inbox.collect { json ->
+        client.readSse(sseUrl.toString()){
+            val json = Json.parseToJsonElement(it.data) as JsonObject
+
             val requestId = json["id"]?.jsonPrimitive?.content
             val payload = json["payload"]?.jsonObject
             //TODO analyze action

demo/src/main/kotlin/hep/dataforge/control/demo/DemoDevice.kt

@@ -50,7 +50,7 @@ class DemoDevice(context: Context) : DeviceBase(context) {
     }
 
 
-    val resetScale: Action by acting {
+    val resetScale: DeviceAction by acting {
         timeScaleValue = 5000.0
         sinScaleValue = 1.0
         cosScaleValue = 1.0

ktor-sse/src/commonMain/kotlin/ru/mipt/npm/io/sse/SseEvent.kt

@@ -39,7 +39,7 @@ public suspend fun ByteReadChannel.readSseFlow(): Flow<SseEvent> = channelFlow {
 
         do{
             val line = readUTF8Line()
-            if (line != null && !line.isBlank()) {
+            if (line != null && line.isNotBlank()) {
                 val key = line.substringBefore(":")
                 val value = line.substringAfter(": ")
                 when (key) {

motors/build.gradle.kts

@@ -13,4 +13,5 @@ val ktorVersion: String by rootProject.extra
 
 dependencies {
     implementation(project(":dataforge-device-core"))
+    implementation(project(":dataforge-magix-client"))
 }

motors/src/main/kotlin/ru/mipt/npm/devices/pimotionmaster/PiMotionMasterDevice.kt

@@ -12,8 +12,10 @@ import hep.dataforge.control.ports.PortProxy
 import hep.dataforge.control.ports.send
 import hep.dataforge.control.ports.withDelimiter
 import hep.dataforge.meta.MetaItem
+import hep.dataforge.meta.asMetaItem
 import hep.dataforge.names.NameToken
 import hep.dataforge.values.Null
+import hep.dataforge.values.asValue
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.takeWhile
@@ -48,7 +50,8 @@ public class PiMotionMasterDevice(
     private val mutex = Mutex()
 
     private suspend fun dispatchError(errorCode: Int) {
-
+        logger.error { "Error code: $errorCode" }
+        //TODO add error handling
     }
 
     private suspend fun sendCommandInternal(command: String, vararg arguments: String) {
@@ -108,7 +111,7 @@ public class PiMotionMasterDevice(
     }
 
 
-    public val initialize: Action by acting {
+    public val initialize: DeviceAction by acting {
         send("INI")
     }
 
@@ -116,7 +119,7 @@ public class PiMotionMasterDevice(
         request("VER?").first()
     }
 
-    public val stop: Action by acting(
+    public val stop: DeviceAction by acting(
         descriptorBuilder = {
             info = "Stop all axis"
         },
@@ -164,7 +167,7 @@ public class PiMotionMasterDevice(
             info = "Motor enable state."
         }
 
-        public val halt: Action by acting {
+        public val halt: DeviceAction by acting {
             send("HLT", axisId)
         }
 
@@ -218,10 +221,14 @@ public class PiMotionMasterDevice(
         }
     }
 
+    val axisIds: ReadOnlyDeviceProperty by reading {
+        request("SAI?").map { it.asValue() }.asValue().asMetaItem()
+    }
+
     override val devices: Map<NameToken, Axis> = axes.associate { NameToken(it) to Axis(it) }
 
     /**
-     *
+     * Name-friendly accessor for axis
      */
     val axes: Map<String, Axis> get() = devices.mapKeys { it.toString() }
 

motors/src/main/kotlin/ru/mipt/npm/devices/pimotionmaster/PiMotionMasterVirtualDevice.kt

@@ -1,6 +1,7 @@
 package ru.mipt.npm.devices.pimotionmaster
 
 import hep.dataforge.context.Context
+import hep.dataforge.context.ContextAware
 import hep.dataforge.control.api.Socket
 import hep.dataforge.control.ports.AbstractPort
 import hep.dataforge.control.ports.withDelimiter
@@ -66,7 +67,11 @@ class VirtualPort(private val device: VirtualDevice, context: Context) : Abstrac
 }
 
 
-class PiMotionMasterVirtualDevice(scope: CoroutineScope, axisIds: List<String>) : VirtualDevice(scope) {
+class PiMotionMasterVirtualDevice(
+    override val context: Context,
+    axisIds: List<String>,
+    scope: CoroutineScope = context,
+) : VirtualDevice(scope), ContextAware {
 
     init {
         //add asynchronous send logic here
@@ -131,13 +136,14 @@ class PiMotionMasterVirtualDevice(scope: CoroutineScope, axisIds: List<String>)
     }
 
     private fun respondForAllAxis(axisIds: List<String>, extract: VirtualAxisState.(index: String) -> Any) {
-        val selectedAxis = if (axisIds.isEmpty()|| axisIds[0] == "ALL") {
+        val selectedAxis = if (axisIds.isEmpty() || axisIds[0] == "ALL") {
             axisState.keys
         } else {
             axisIds
         }
-        val response = selectedAxis.joinToString(postfix = "\n", separator = " \n") {
+        val response = selectedAxis.joinToString(separator = " \n") {
-            axisState.getValue(it).extract(it).toString()
+            val state = axisState.getValue(it)
+            "$it=${state.extract(it)}"
         }
         respond(response)
     }
@@ -145,14 +151,18 @@ class PiMotionMasterVirtualDevice(scope: CoroutineScope, axisIds: List<String>)
     override suspend fun evaluateRequest(request: ByteArray) {
         assert(request.last() == '\n'.toByte())
         val string = request.decodeToString().substringBefore("\n")
+            .dropWhile { it != '*' && it != '#' && it !in 'A'..'Z' } //filter junk symbols at the beginning of the line
+
+        //logger.debug { "Received command: $string" }
         val parts = string.split(' ')
         val command = parts.firstOrNull() ?: error("Command not present")
 
         val axisIds: List<String> = parts.drop(1)
 
         when (command) {
-            "XXX" -> {}//respond("WAT?")
+            "XXX" -> {
-            "IDN?","*IDN?" -> respond("(c)2015 Physik Instrumente(PI) Karlsruhe, C-885.M1 TCP-IP Master,0,1.0.0.1")
+            }
+            "IDN?", "*IDN?" -> respond("(c)2015 Physik Instrumente(PI) Karlsruhe, C-885.M1 TCP-IP Master,0,1.0.0.1")
             "VER?" -> respond("""
                 2: (c)2017 Physik Instrumente (PI) GmbH & Co. KG, C-663.12C885, 018550039, 00.039 
                 3: (c)2017 Physik Instrumente (PI) GmbH & Co. KG, C-663.12C885, 018550040, 00.039 
@@ -212,12 +222,12 @@ class PiMotionMasterVirtualDevice(scope: CoroutineScope, axisIds: List<String>)
                 respond(errorCode.toString())
                 errorCode = 0
             }
-            "SAI?" -> respondForAllAxis(axisIds) { it }
+            "SAI?" -> respond(axisIds.joinToString(separator = " \n"))
-            "CST?" -> respond(WAT)
+            "CST?" -> respondForAllAxis(axisIds) { "L-220.20SG" }
             "RON?" -> respondForAllAxis(axisIds) { referenceMode }
             "FRF?" -> respondForAllAxis(axisIds) { "1" } // WAT?
             "SVO?" -> respondForAllAxis(axisIds) { servoMode }
-            "MVO?" -> respondForAllAxis(axisIds) { targetPosition }
+            "MOV?" -> respondForAllAxis(axisIds) { targetPosition }
             "POS?" -> respondForAllAxis(axisIds) { position }
             "TMN?" -> respondForAllAxis(axisIds) { minPosition }
             "TMX?" -> respondForAllAxis(axisIds) { maxPosition }
@@ -228,7 +238,10 @@ class PiMotionMasterVirtualDevice(scope: CoroutineScope, axisIds: List<String>)
                 val servoMode = parts.last()
                 axisState[requestAxis]?.servoMode = servoMode.toInt()
             }
-            else -> errorCode = 2 // do not send anything. Ser error code
+            else -> {
+                logger.warn { "Unknown command: $command in message ${String(request)}" }
+                errorCode = 2
+            } // do not send anything. Ser error code
         }
     }
 

motors/src/main/kotlin/ru/mipt/npm/devices/pimotionmaster/piDebugServer.kt

@@ -14,7 +14,7 @@ import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.collect
 import java.net.InetSocketAddress
 
-val exceptionHandler = CoroutineExceptionHandler { coroutineContext, throwable ->
+val exceptionHandler = CoroutineExceptionHandler { _, throwable ->
     throwable.printStackTrace()
 }
 

settings.gradle.kts

@@ -31,7 +31,7 @@ include(
     ":dataforge-device-core",
     ":dataforge-device-serial",
     ":dataforge-device-server",
-    ":dataforge-device-client",
+    ":dataforge-magix-client",
     ":demo",
     ":motors"
 )