Fix loading duplicating plugins in visionServer

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionContainer.kt

@@ -24,7 +24,7 @@ public interface MutableVisionContainer<in V : Vision> {
  * A serializable representation of [Vision] children container
  */
 public interface VisionChildren : VisionContainer<Vision> {
-    public val group: Vision?
+    public val parent: Vision?
 
     public val keys: Set<NameToken>
 
@@ -35,7 +35,7 @@ public interface VisionChildren : VisionContainer<Vision> {
     public operator fun get(token: NameToken): Vision?
 
     override fun getChild(name: Name): Vision? = when (name.length) {
-        0 -> group
+        0 -> parent
         1 -> get(name.first())
         else -> get(name.first())?.children?.getChild(name.cutFirst())
     }
@@ -44,7 +44,7 @@ public interface VisionChildren : VisionContainer<Vision> {
         public const val STATIC_TOKEN_BODY: String = "@static"
 
         public fun empty(owner: Vision): VisionChildren = object : VisionChildren {
-            override val group: Vision get() = owner
+            override val parent: Vision get() = owner
             override val keys: Set<NameToken> get() = emptySet()
             override val changes: Flow<Name> get() = emptyFlow()
             override fun get(token: NameToken): Vision? = null
@@ -64,7 +64,7 @@ public inline fun VisionChildren.forEach(block: (NameToken, Vision) -> Unit) {
 
 public interface MutableVisionChildren : VisionChildren, MutableVisionContainer<Vision> {
 
-    public override val group: MutableVisionGroup
+    public override val parent: MutableVisionGroup
 
     public operator fun set(token: NameToken, value: Vision?)
 
@@ -85,7 +85,7 @@ public interface MutableVisionChildren : VisionChildren, MutableVisionContainer<
             else -> {
                 val currentParent = get(name.first())
                 if (currentParent != null && currentParent !is MutableVisionGroup) error("Can't assign a child to $currentParent")
-                val parent: MutableVisionGroup = currentParent as? MutableVisionGroup ?: group.createGroup().also {
+                val parent: MutableVisionGroup = currentParent as? MutableVisionGroup ?: parent.createGroup().also {
                     set(name.first(), it)
                 }
                 parent.children.setChild(name.cutFirst(), child)
@@ -125,7 +125,7 @@ public fun <V : Vision> MutableVisionContainer<V>.setChild(
 ): Unit = setChild(str?.parseAsName(), vision)
 
 internal abstract class VisionChildrenImpl(
-    override val group: MutableVisionGroup,
+    override val parent: MutableVisionGroup,
 ) : MutableVisionChildren {
 
     private val updateJobs = HashMap<NameToken, Job>()
@@ -140,7 +140,7 @@ internal abstract class VisionChildrenImpl(
         return items!!
     }
 
-    private val scope: CoroutineScope? get() = group.manager?.context
+    private val scope: CoroutineScope? get() = parent.manager?.context
 
     override val keys: Set<NameToken> get() = items?.keys ?: emptySet()
 
@@ -170,9 +170,9 @@ internal abstract class VisionChildrenImpl(
         } else {
             (items ?: buildItems())[token] = value
             //check if parent already exists and is different from the current one
-            if (value.parent != null && value.parent != group) error("Can't reassign parent Vision for $value")
+            if (value.parent != null && value.parent != parent) error("Can't reassign parent Vision for $value")
             //set parent
-            value.parent = group
+            value.parent = parent
             //start update jobs (only if the vision is rooted)
             scope?.let { scope ->
                 val job = value.children?.changes?.onEach {

visionforge-server/src/main/kotlin/space/kscience/visionforge/server/VisionServer.kt

@@ -1,10 +1,7 @@
 package space.kscience.visionforge.server
 
 import io.ktor.http.*
-import io.ktor.server.application.Application
-import io.ktor.server.application.call
-import io.ktor.server.application.install
-import io.ktor.server.application.log
+import io.ktor.server.application.*
 import io.ktor.server.cio.CIO
 import io.ktor.server.engine.ApplicationEngine
 import io.ktor.server.engine.embeddedServer
@@ -18,6 +15,7 @@ import io.ktor.server.routing.*
 import io.ktor.server.util.getOrFail
 import io.ktor.server.websocket.WebSockets
 import io.ktor.server.websocket.webSocket
+import io.ktor.util.pipeline.Pipeline
 import io.ktor.websocket.Frame
 import kotlinx.coroutines.channels.consumeEach
 import kotlinx.coroutines.flow.collect
@@ -270,6 +268,11 @@ public class VisionServer internal constructor(
     }
 }
 
+public fun <P : Pipeline<*, ApplicationCall>, B : Any, F : Any> P.require(
+    plugin: Plugin<P, B, F>,
+    configure: B.() -> Unit = {},
+): F = pluginOrNull(plugin) ?: install(plugin, configure)
+
 /**
  * Attach VisionForge server application to given server
  */
@@ -278,8 +281,8 @@ public fun Application.visionServer(
     webServerUrl: Url,
     path: String = DEFAULT_PAGE,
 ): VisionServer {
-    install(WebSockets)
-    install(CORS) {
+    require(WebSockets)
+    require(CORS) {
         anyHost()
     }
 
@@ -287,7 +290,7 @@ public fun Application.visionServer(
 //        install(CallLogging)
 //    }
 
-    val serverRoute = install(Routing).createRouteFromPath(path)
+    val serverRoute = require(Routing).createRouteFromPath(path)
 
     serverRoute {
         static {

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidReference.kt

@@ -124,7 +124,7 @@ public class SolidReference(
 
     override val children: VisionChildren
         get() = object : VisionChildren {
-            override val group: Vision get() = this@SolidReference
+            override val parent: Vision get() = this@SolidReference
 
             override val keys: Set<NameToken> get() = prototype.children?.keys ?: emptySet()
 
@@ -198,7 +198,7 @@ internal class SolidReferenceChild(
 
 
     override val children: VisionChildren = object : VisionChildren {
-        override val group: Vision get() = this@SolidReferenceChild
+        override val parent: Vision get() = this@SolidReferenceChild
 
         override val keys: Set<NameToken> get() = prototype.children?.keys ?: emptySet()