commit 927f15270d1370e574335f3044a94c33c2fa2d63
Author: Alexander Nozik <altavir@gmail.com>
Date:   Wed Oct 26 13:37:43 2022 +0300

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8f3a1fa
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+build/
+.gradle/
+.idea/
+/*.iml
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..6592ab3
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,81 @@
+plugins {
+    kotlin("multiplatform") version "1.7.10"
+    kotlin("plugin.serialization") version "1.7.10"
+    id("org.jetbrains.compose")
+    application
+}
+
+group = "center.sciprog"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    jcenter()
+    mavenCentral()
+    maven("https://maven.pkg.jetbrains.space/public/p/kotlinx-html/maven")
+}
+
+kotlin {
+    jvm {
+        compilations.all {
+            kotlinOptions.jvmTarget = "11"
+        }
+        withJava()
+        testRuns["test"].executionTask.configure {
+            useJUnitPlatform()
+        }
+    }
+    js(IR) {
+        binaries.executable()
+        browser {
+            commonWebpackConfig {
+                cssSupport.enabled = true
+                bundleAnalyzerReportDir = File(buildDir, "analysis")
+            }
+        }
+    }
+    sourceSets {
+        val commonMain by getting {
+            dependencies {
+                implementation(compose.runtime)
+                implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.4")
+                implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.4.1")
+            }
+        }
+        val commonTest by getting {
+            dependencies {
+                implementation(kotlin("test"))
+            }
+        }
+        val jvmMain by getting {
+            dependencies {
+                implementation("io.ktor:ktor-server-netty:2.1.2")
+                implementation("io.ktor:ktor-server-html-builder-jvm:2.1.2")
+                implementation("org.jetbrains.kotlinx:kotlinx-html-jvm:0.7.2")
+                implementation("io.rsocket.kotlin:rsocket-ktor-server:0.15.4")
+            }
+        }
+        val jvmTest by getting
+        val jsMain by getting {
+            dependencies {
+                implementation(compose.web.core)
+                implementation("io.ktor:ktor-client-js:2.1.2")
+                implementation("io.rsocket.kotlin:rsocket-transport-ktor-websocket-client:0.15.4")
+            }
+        }
+        val jsTest by getting
+    }
+}
+
+application {
+    mainClass.set("center.sciprog.application.ServerKt")
+}
+
+tasks.named<Copy>("jvmProcessResources") {
+    val jsBrowserDistribution = tasks.named("jsBrowserDistribution")
+    from(jsBrowserDistribution)
+}
+
+tasks.named<JavaExec>("run") {
+    dependsOn(tasks.named<Jar>("jvmJar"))
+    classpath(tasks.named<Jar>("jvmJar"))
+}
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..48ff2cf
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,8 @@
+kotlin.code.style=official
+kotlin.mpp.enableGranularSourceSetsMetadata=true
+kotlin.native.enableDependencyPropagation=false
+kotlin.js.generate.executable.default=false
+
+kotlin.js.webpack.major.version=4
+kotlin.version=1.7.10
+compose.version=1.2.0
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..41d9927
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..ae04661
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..1b6c787
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..107acd3
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle.kts b/settings.gradle.kts
new file mode 100644
index 0000000..bbcd99d
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1,18 @@
+
+rootProject.name = "full-stack-demo"
+
+pluginManagement {
+    repositories {
+        google()
+        gradlePluginPortal()
+        mavenCentral()
+        maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
+    }
+
+    plugins {
+        kotlin("multiplatform").version(extra["kotlin.version"] as String)
+        id("org.jetbrains.compose").version(extra["compose.version"] as String)
+    }
+}
+
+
diff --git a/src/commonMain/kotlin/model.kt b/src/commonMain/kotlin/model.kt
new file mode 100644
index 0000000..48d1f5f
--- /dev/null
+++ b/src/commonMain/kotlin/model.kt
@@ -0,0 +1,13 @@
+import kotlinx.serialization.Serializable
+
+@Serializable
+sealed interface ControlEvent
+
+@Serializable
+data class IntControlEvent(val value: Int) : ControlEvent
+
+@Serializable
+sealed interface DataEvent
+
+@Serializable
+data class IntDataEvent(val value: Int) : DataEvent
\ No newline at end of file
diff --git a/src/jsMain/kotlin/client.kt b/src/jsMain/kotlin/client.kt
new file mode 100644
index 0000000..9850ec9
--- /dev/null
+++ b/src/jsMain/kotlin/client.kt
@@ -0,0 +1,85 @@
+import androidx.compose.runtime.*
+import io.ktor.client.engine.js.Js
+import io.rsocket.kotlin.RSocket
+import io.rsocket.kotlin.core.RSocketConnector
+import io.rsocket.kotlin.payload.Payload
+import io.rsocket.kotlin.payload.buildPayload
+import io.rsocket.kotlin.payload.data
+import io.rsocket.kotlin.transport.ktor.websocket.client.WebSocketClientTransport
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.launch
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+import org.jetbrains.compose.web.css.padding
+import org.jetbrains.compose.web.css.px
+import org.jetbrains.compose.web.dom.Button
+import org.jetbrains.compose.web.dom.Div
+import org.jetbrains.compose.web.dom.Span
+import org.jetbrains.compose.web.dom.Text
+import org.jetbrains.compose.web.renderComposable
+
+
+suspend fun main() {
+    val transport = WebSocketClientTransport(Js, "localhost", path = "rsocket", port = 8080)
+    val connector = RSocketConnector()
+
+    //initialize rsocket connection
+    val rsocket: RSocket = connector.connect(transport)
+
+    //receive data events from server
+    val dataFlow: Flow<DataEvent> = rsocket.requestStream(Payload.Empty).map {
+        Json.decodeFromString<DataEvent>(it.data.readText())
+    }
+
+    //send control events to server
+    suspend fun sendEvent(event: ControlEvent) {
+        println("Sending $event")
+        rsocket.fireAndForget(buildPayload { data(Json.encodeToString(event)) })
+    }
+
+
+    var count: Int by mutableStateOf(0)
+
+    renderComposable(rootElementId = "root") {
+        val scope = rememberCoroutineScope()
+
+        fun setCount(value: Int) {
+            count = value
+            scope.launch {
+                sendEvent(IntControlEvent(value))
+            }
+        }
+
+        remember {
+            dataFlow.onEach { event ->
+                println("Received $event")
+                if (event is IntDataEvent) {
+                    count = event.value
+                }
+            }.launchIn(scope)
+        }
+
+        Div({ style { padding(25.px) } }) {
+            Button(attrs = {
+                onClick { setCount(count - 1) }
+            }) {
+                Text("-")
+            }
+
+            Span({ style { padding(15.px) } }) {
+                Text("$count")
+            }
+
+            Button(attrs = {
+                onClick { setCount(count + 1) }
+            }) {
+                Text("+")
+            }
+        }
+    }
+}
+
diff --git a/src/jsMain/resources/index.html b/src/jsMain/resources/index.html
new file mode 100644
index 0000000..a9c55b9
--- /dev/null
+++ b/src/jsMain/resources/index.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Full stack demo</title>
+</head>
+<body>
+<div id="root"></div>
+<script src="full-stack-demo.js"></script>
+</body>
+</html>
\ No newline at end of file
diff --git a/src/jvmMain/kotlin/center.sciprog.application/server.kt b/src/jvmMain/kotlin/center.sciprog.application/server.kt
new file mode 100644
index 0000000..977e957
--- /dev/null
+++ b/src/jvmMain/kotlin/center.sciprog.application/server.kt
@@ -0,0 +1,91 @@
+package center.sciprog.application
+
+import ControlEvent
+import DataEvent
+import IntControlEvent
+import IntDataEvent
+import io.ktor.http.HttpStatusCode
+import io.ktor.server.application.call
+import io.ktor.server.application.install
+import io.ktor.server.engine.embeddedServer
+import io.ktor.server.html.respondHtml
+import io.ktor.server.http.content.resources
+import io.ktor.server.netty.Netty
+import io.ktor.server.routing.get
+import io.ktor.server.routing.routing
+import io.ktor.server.websocket.WebSockets
+import io.rsocket.kotlin.RSocketRequestHandler
+import io.rsocket.kotlin.ktor.server.RSocketSupport
+import io.rsocket.kotlin.ktor.server.rSocket
+import io.rsocket.kotlin.payload.Payload
+import io.rsocket.kotlin.payload.buildPayload
+import io.rsocket.kotlin.payload.data
+import kotlinx.coroutines.flow.*
+import kotlinx.html.*
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+
+fun HTML.index() {
+    head {
+        meta {
+            charset = "UTF-8"
+        }
+        title("Hello from Ktor!")
+    }
+    body {
+        div {
+            id = "root"
+        }
+        script {
+            src = "full-stack-demo.js"
+        }
+    }
+}
+
+fun main() {
+    embeddedServer(Netty, port = 8080, host = "127.0.0.1") {
+        install(WebSockets) //rsocket requires websockets plugin installed
+        install(RSocketSupport)
+
+        val controlFlow = MutableSharedFlow<ControlEvent>()
+        var counterState = 0
+        val dataFlow = MutableSharedFlow<DataEvent>()
+
+        controlFlow.onEach { event ->
+            println("Received $event")
+            if (event is IntControlEvent) {
+                counterState = event.value
+                dataFlow.emit(IntDataEvent(event.value))
+            }
+        }.launchIn(this)
+
+
+
+        routing {
+            get("/") {
+                call.respondHtml(HttpStatusCode.OK, HTML::index)
+            }
+            resources()
+
+            rSocket("rsocket") {
+                println(config.setupPayload.data.readText()) //print setup payload data
+
+                RSocketRequestHandler {
+                    //handler for control event push
+                    fireAndForget { payload ->
+                        controlFlow.emit(Json.decodeFromString<ControlEvent>(payload.data.readText()))
+                    }
+                    //handler for request/stream
+                    requestStream { _: Payload ->
+                        merge(flowOf(IntDataEvent(counterState)), dataFlow).map { event ->
+                            buildPayload {
+                                data(Json.encodeToString<DataEvent>(event))
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }.start(wait = true)
+}
\ No newline at end of file