netty TCP, WebSocket and QUIC transports

* QUIC implementation is still WIP

gradle/libs.versions.toml

@@ -8,6 +8,12 @@ kotlinx-bcv = "0.14.0"
 
 ktor = "2.3.8"
 
+netty = "4.1.109.Final"
+netty-quic = "0.0.62.Final"
+
+# for netty TLS tests
+bouncycastle = "1.78"
+
 turbine = "1.0.0"
 
 rsocket-java = "1.1.3"
@@ -37,6 +43,12 @@ ktor-server-cio = { module = "io.ktor:ktor-server-cio", version.ref = "ktor" }
 ktor-server-netty = { module = "io.ktor:ktor-server-netty", version.ref = "ktor" }
 ktor-server-jetty = { module = "io.ktor:ktor-server-jetty", version.ref = "ktor" }
 
+netty-handler = { module = "io.netty:netty-handler", version.ref = "netty" }
+netty-codec-http = { module = "io.netty:netty-codec-http", version.ref = "netty" }
+netty-codec-quic = { module = "io.netty.incubator:netty-incubator-codec-native-quic", version.ref = "netty-quic" }
+
+bouncycastle = { module = "org.bouncycastle:bcpkix-jdk18on", version.ref = "bouncycastle" }
+
 turbine = { module = "app.cash.turbine:turbine", version.ref = "turbine" }
 
 rsocket-java-core = { module = 'io.rsocket:rsocket-core', version.ref = "rsocket-java" }

rsocket-transports/netty-internal/api/rsocket-transport-netty-internal.api

@@ -0,0 +1,8 @@
+public final class io/rsocket/kotlin/transport/netty/internal/CoroutinesKt {
+	public static final fun awaitChannel (Lio/netty/channel/ChannelFuture;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
+	public static final fun awaitFuture (Lio/netty/util/concurrent/Future;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
+	public static final fun callOnCancellation (Lkotlinx/coroutines/CoroutineScope;Lkotlin/jvm/functions/Function1;)V
+	public static final fun toByteBuf (Lio/ktor/utils/io/core/ByteReadPacket;)Lio/netty/buffer/ByteBuf;
+	public static final fun toByteReadPacket (Lio/netty/buffer/ByteBuf;)Lio/ktor/utils/io/core/ByteReadPacket;
+}
+

rsocket-transports/netty-internal/build.gradle.kts

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2015-2024 the original author or 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
+ *
+ *     http://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.
+ */
+
+import rsocketbuild.*
+
+plugins {
+    id("rsocketbuild.multiplatform-library")
+}
+
+description = "rsocket-kotlin Netty transport utils"
+
+kotlin {
+    jvmTarget()
+
+    sourceSets {
+        jvmMain.dependencies {
+            implementation(projects.rsocketInternalIo)
+            api(projects.rsocketCore)
+            api(libs.netty.handler)
+        }
+    }
+}

rsocket-transports/netty-internal/src/jvmMain/kotlin/io/rsocket/kotlin/transport/netty/internal/coroutines.kt

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2015-2024 the original author or 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
+ *
+ *     http://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.
+ */
+
+package io.rsocket.kotlin.transport.netty.internal
+
+import io.ktor.utils.io.core.*
+import io.netty.buffer.*
+import io.netty.channel.*
+import io.netty.util.concurrent.*
+import kotlinx.coroutines.*
+import kotlin.coroutines.*
+
+@Suppress("UNCHECKED_CAST")
+public suspend inline fun <T> Future<T>.awaitFuture(): T = suspendCancellableCoroutine { cont ->
+    addListener {
+        when {
+            it.isSuccess -> cont.resume(it.now as T)
+            else         -> cont.resumeWithException(it.cause())
+        }
+    }
+    cont.invokeOnCancellation {
+        cancel(true)
+    }
+}
+
+public suspend fun ChannelFuture.awaitChannel(): Channel {
+    awaitFuture()
+    return channel()
+}
+
+// it should be used only for cleanup and so should not really block, only suspend
+public inline fun CoroutineScope.callOnCancellation(crossinline block: suspend () -> Unit) {
+    launch(Dispatchers.Unconfined) {
+        try {
+            awaitCancellation()
+        } catch (cause: Throwable) {
+            withContext(NonCancellable) {
+                try {
+                    block()
+                } catch (suppressed: Throwable) {
+                    cause.addSuppressed(suppressed)
+                }
+            }
+            throw cause
+        }
+    }
+}
+
+// TODO: what to use: this or ByteReadPacket(msg.nioBuffer())
+public fun ByteBuf.toByteReadPacket(): ByteReadPacket = buildPacket { writeFully(nioBuffer()) }
+public fun ByteReadPacket.toByteBuf(): ByteBuf = Unpooled.wrappedBuffer(readByteBuffer())

rsocket-transports/netty-quic/api/rsocket-transport-netty-quic.api

@@ -0,0 +1,43 @@
+public abstract interface class io/rsocket/kotlin/transport/netty/quic/NettyQuicClientTransport : io/rsocket/kotlin/transport/RSocketTransport {
+	public static final field Factory Lio/rsocket/kotlin/transport/netty/quic/NettyQuicClientTransport$Factory;
+	public abstract fun target (Ljava/lang/String;I)Lio/rsocket/kotlin/transport/RSocketClientTarget;
+	public abstract fun target (Ljava/net/InetSocketAddress;)Lio/rsocket/kotlin/transport/RSocketClientTarget;
+}
+
+public final class io/rsocket/kotlin/transport/netty/quic/NettyQuicClientTransport$Factory : io/rsocket/kotlin/transport/RSocketTransportFactory {
+}
+
+public abstract interface class io/rsocket/kotlin/transport/netty/quic/NettyQuicClientTransportBuilder : io/rsocket/kotlin/transport/RSocketTransportBuilder {
+	public abstract fun bootstrap (Lkotlin/jvm/functions/Function1;)V
+	public abstract fun channel (Lkotlin/reflect/KClass;)V
+	public abstract fun channelFactory (Lio/netty/channel/ChannelFactory;)V
+	public abstract fun codec (Lkotlin/jvm/functions/Function1;)V
+	public abstract fun eventLoopGroup (Lio/netty/channel/EventLoopGroup;Z)V
+	public abstract fun quicBootstrap (Lkotlin/jvm/functions/Function1;)V
+	public abstract fun ssl (Lkotlin/jvm/functions/Function1;)V
+}
+
+public abstract interface class io/rsocket/kotlin/transport/netty/quic/NettyQuicServerInstance : io/rsocket/kotlin/transport/RSocketServerInstance {
+	public abstract fun getLocalAddress ()Ljava/net/InetSocketAddress;
+}
+
+public abstract interface class io/rsocket/kotlin/transport/netty/quic/NettyQuicServerTransport : io/rsocket/kotlin/transport/RSocketTransport {
+	public static final field Factory Lio/rsocket/kotlin/transport/netty/quic/NettyQuicServerTransport$Factory;
+	public abstract fun target (Ljava/lang/String;I)Lio/rsocket/kotlin/transport/RSocketServerTarget;
+	public abstract fun target (Ljava/net/InetSocketAddress;)Lio/rsocket/kotlin/transport/RSocketServerTarget;
+	public static synthetic fun target$default (Lio/rsocket/kotlin/transport/netty/quic/NettyQuicServerTransport;Ljava/lang/String;IILjava/lang/Object;)Lio/rsocket/kotlin/transport/RSocketServerTarget;
+	public static synthetic fun target$default (Lio/rsocket/kotlin/transport/netty/quic/NettyQuicServerTransport;Ljava/net/InetSocketAddress;ILjava/lang/Object;)Lio/rsocket/kotlin/transport/RSocketServerTarget;
+}
+
+public final class io/rsocket/kotlin/transport/netty/quic/NettyQuicServerTransport$Factory : io/rsocket/kotlin/transport/RSocketTransportFactory {
+}
+
+public abstract interface class io/rsocket/kotlin/transport/netty/quic/NettyQuicServerTransportBuilder : io/rsocket/kotlin/transport/RSocketTransportBuilder {
+	public abstract fun bootstrap (Lkotlin/jvm/functions/Function1;)V
+	public abstract fun channel (Lkotlin/reflect/KClass;)V
+	public abstract fun channelFactory (Lio/netty/channel/ChannelFactory;)V
+	public abstract fun codec (Lkotlin/jvm/functions/Function1;)V
+	public abstract fun eventLoopGroup (Lio/netty/channel/EventLoopGroup;Z)V
+	public abstract fun ssl (Lkotlin/jvm/functions/Function1;)V
+}
+

rsocket-transports/netty-quic/build.gradle.kts

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2015-2024 the original author or 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
+ *
+ *     http://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.
+ */
+
+import rsocketbuild.*
+
+plugins {
+    id("rsocketbuild.multiplatform-library")
+}
+
+description = "rsocket-kotlin Netty QUIC client/server transport implementation"
+
+kotlin {
+    jvmTarget()
+
+    sourceSets {
+        jvmMain.dependencies {
+            implementation(projects.rsocketTransportNettyInternal)
+            implementation(projects.rsocketInternalIo)
+            api(projects.rsocketCore)
+            api(libs.netty.handler)
+            api(libs.netty.codec.quic)
+        }
+        jvmTest.dependencies {
+            implementation(projects.rsocketTransportTests)
+            implementation(libs.bouncycastle)
+            implementation(libs.netty.codec.quic.map {
+                val javaOsName = System.getProperty("os.name")
+                val javaOsArch = System.getProperty("os.arch")
+                val suffix = when {
+                    javaOsName.contains("mac", ignoreCase = true)     -> "osx"
+                    javaOsName.contains("linux", ignoreCase = true)   -> "linux"
+                    javaOsName.contains("windows", ignoreCase = true) -> "windows"
+                    else                                              -> error("Unknown os.name: $javaOsName")
+                } + "-" + when (javaOsArch) {
+                    "x86_64", "amd64"  -> "x86_64"
+                    "arm64", "aarch64" -> "aarch_64"
+                    else               -> error("Unknown os.arch: $javaOsArch")
+                }
+                "$it:$suffix"
+            })
+            //implementation("ch.qos.logback:logback-classic:1.2.11")
+        }
+    }
+}

rsocket-transports/netty-quic/src/jvmMain/kotlin/io/rsocket/kotlin/transport/netty/quic/NettyQuicClientTransport.kt

@@ -0,0 +1,153 @@
+/*
+ * Copyright 2015-2024 the original author or 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
+ *
+ *     http://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.
+ */
+
+package io.rsocket.kotlin.transport.netty.quic
+
+import io.netty.bootstrap.*
+import io.netty.channel.*
+import io.netty.channel.ChannelFactory
+import io.netty.channel.nio.*
+import io.netty.channel.socket.*
+import io.netty.channel.socket.nio.*
+import io.netty.incubator.codec.quic.*
+import io.rsocket.kotlin.internal.io.*
+import io.rsocket.kotlin.transport.*
+import io.rsocket.kotlin.transport.netty.internal.*
+import kotlinx.coroutines.*
+import java.net.*
+import kotlin.coroutines.*
+import kotlin.reflect.*
+
+public sealed interface NettyQuicClientTransport : RSocketTransport {
+    public fun target(remoteAddress: InetSocketAddress): RSocketClientTarget
+    public fun target(host: String, port: Int): RSocketClientTarget
+
+    public companion object Factory :
+        RSocketTransportFactory<NettyQuicClientTransport, NettyQuicClientTransportBuilder>(::NettyQuicClientTransportBuilderImpl)
+}
+
+public sealed interface NettyQuicClientTransportBuilder : RSocketTransportBuilder<NettyQuicClientTransport> {
+    public fun channel(cls: KClass<out DatagramChannel>)
+    public fun channelFactory(factory: ChannelFactory<out DatagramChannel>)
+    public fun eventLoopGroup(group: EventLoopGroup, manage: Boolean)
+
+    public fun bootstrap(block: Bootstrap.() -> Unit)
+    public fun codec(block: QuicClientCodecBuilder.() -> Unit)
+    public fun ssl(block: QuicSslContextBuilder.() -> Unit)
+    public fun quicBootstrap(block: QuicChannelBootstrap.() -> Unit)
+}
+
+private class NettyQuicClientTransportBuilderImpl : NettyQuicClientTransportBuilder {
+    private var channelFactory: ChannelFactory<out DatagramChannel>? = null
+    private var eventLoopGroup: EventLoopGroup? = null
+    private var manageEventLoopGroup: Boolean = false
+    private var bootstrap: (Bootstrap.() -> Unit)? = null
+    private var codec: (QuicClientCodecBuilder.() -> Unit)? = null
+    private var ssl: (QuicSslContextBuilder.() -> Unit)? = null
+    private var quicBootstrap: (QuicChannelBootstrap.() -> Unit)? = null
+
+    override fun channel(cls: KClass<out DatagramChannel>) {
+        this.channelFactory = ReflectiveChannelFactory(cls.java)
+    }
+
+    override fun channelFactory(factory: ChannelFactory<out DatagramChannel>) {
+        this.channelFactory = factory
+    }
+
+    override fun eventLoopGroup(group: EventLoopGroup, manage: Boolean) {
+        this.eventLoopGroup = group
+        this.manageEventLoopGroup = manage
+    }
+
+    override fun bootstrap(block: Bootstrap.() -> Unit) {
+        bootstrap = block
+    }
+
+    override fun codec(block: QuicClientCodecBuilder.() -> Unit) {
+        codec = block
+    }
+
+    override fun ssl(block: QuicSslContextBuilder.() -> Unit) {
+        ssl = block
+    }
+
+    override fun quicBootstrap(block: QuicChannelBootstrap.() -> Unit) {
+        quicBootstrap = block
+    }
+
+    @RSocketTransportApi
+    override fun buildTransport(context: CoroutineContext): NettyQuicClientTransport {
+        val codecHandler = QuicClientCodecBuilder().apply {
+            // by default, we allow Int.MAX_VALUE of active stream
+            initialMaxStreamsBidirectional(Int.MAX_VALUE.toLong())
+            codec?.invoke(this)
+            ssl?.let {
+                sslContext(QuicSslContextBuilder.forClient().apply(it).build())
+            }
+        }.build()
+        val bootstrap = Bootstrap().apply {
+            bootstrap?.invoke(this)
+            localAddress(0)
+            handler(codecHandler)
+            channelFactory(channelFactory ?: ReflectiveChannelFactory(NioDatagramChannel::class.java))
+            group(eventLoopGroup ?: NioEventLoopGroup())
+        }
+
+        return NettyQuicClientTransportImpl(
+            coroutineContext = context.supervisorContext() + bootstrap.config().group().asCoroutineDispatcher(),
+            bootstrap = bootstrap,
+            quicBootstrap = quicBootstrap,
+            manageBootstrap = manageEventLoopGroup
+        )
+    }
+}
+
+private class NettyQuicClientTransportImpl(
+    override val coroutineContext: CoroutineContext,
+    private val bootstrap: Bootstrap,
+    private val quicBootstrap: (QuicChannelBootstrap.() -> Unit)?,
+    manageBootstrap: Boolean,
+) : NettyQuicClientTransport {
+    init {
+        if (manageBootstrap) callOnCancellation {
+            bootstrap.config().group().shutdownGracefully().awaitFuture()
+        }
+    }
+
+    override fun target(remoteAddress: InetSocketAddress): NettyQuicClientTargetImpl = NettyQuicClientTargetImpl(
+        coroutineContext = coroutineContext.supervisorContext(),
+        bootstrap = bootstrap,
+        quicBootstrap = quicBootstrap,
+        remoteAddress = remoteAddress
+    )
+
+    override fun target(host: String, port: Int): RSocketClientTarget = target(InetSocketAddress(host, port))
+}
+
+private class NettyQuicClientTargetImpl(
+    override val coroutineContext: CoroutineContext,
+    private val bootstrap: Bootstrap,
+    private val quicBootstrap: (QuicChannelBootstrap.() -> Unit)?,
+    private val remoteAddress: SocketAddress,
+) : RSocketClientTarget {
+    @RSocketTransportApi
+    override fun connectClient(handler: RSocketConnectionHandler): Job = launch {
+        QuicChannel.newBootstrap(bootstrap.bind().awaitChannel()).also { quicBootstrap?.invoke(it) }
+            .handler(
+                NettyQuicConnectionInitializer(handler, coroutineContext, isClient = true)
+            ).remoteAddress(remoteAddress).connect().awaitFuture()
+    }
+}