Use blocking access to solve ZMQ performance issues.

magix/magix-demo/src/main/kotlin/zmq.kt

@@ -1,21 +1,21 @@
+import kotlinx.coroutines.cancel
 import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.isActive
-import kotlinx.serialization.json.JsonElement
-import kotlinx.serialization.json.JsonObjectBuilder
-import kotlinx.serialization.json.buildJsonObject
-import kotlinx.serialization.json.put
+import kotlinx.serialization.json.*
 import org.slf4j.LoggerFactory
 import ru.mipt.npm.magix.api.MagixEndpoint
 import ru.mipt.npm.magix.api.MagixMessage
 import ru.mipt.npm.magix.server.startMagixServer
 import ru.mipt.npm.magix.zmq.ZmqMagixEndpoint
+import java.awt.Desktop
+import java.net.URI
 
 
-suspend fun MagixEndpoint<JsonElement>.sendJson(
+suspend fun MagixEndpoint<JsonObject>.sendJson(
     origin: String,
     format: String = "json",
     target: String? = null,
@@ -25,33 +25,44 @@ suspend fun MagixEndpoint<JsonElement>.sendJson(
     builder: JsonObjectBuilder.() -> Unit
 ): Unit = broadcast(MagixMessage(format, origin, buildJsonObject(builder), target, id, parentId, user))
 
+internal const val numberOfMessages = 100
+
 suspend fun main(): Unit = coroutineScope {
     val logger = LoggerFactory.getLogger("magix-demo")
     logger.info("Starting magix server")
-    val server = startMagixServer(enableRawRSocket = false)
-    logger.info("Waiting for server to start")
-    delay(2000)
+    val server = startMagixServer(
+        buffer = 10,
+        enableRawRSocket = false //Disable rsocket to avoid kotlin 1.5 compatibility issue
+    )
+
+    server.apply {
+        val host = "localhost"//environment.connectors.first().host
+        val port = environment.connectors.first().port
+        val uri = URI("http", null, host, port, "/state", null, null)
+        Desktop.getDesktop().browse(uri)
+    }
 
     logger.info("Starting client")
-    ZmqMagixEndpoint("tcp://localhost", JsonElement.serializer()).use { client ->
+    //Create zmq magix endpoint and wait for to finish
+    ZmqMagixEndpoint("tcp://localhost", JsonObject.serializer()).use { client ->
         logger.info("Starting subscription")
-        try {
-            client.subscribe().onEach {
-                println(it.payload)
-            }.catch { it.printStackTrace() }.launchIn(this)
-        } catch (t: Throwable) {
-            t.printStackTrace()
-            throw t
-        }
+        client.subscribe().onEach {
+            println(it.payload)
+            if (it.payload["index"]?.jsonPrimitive?.int == numberOfMessages) {
+                logger.info("Index $numberOfMessages reached. Terminating")
+                cancel()
+            }
+        }.catch { it.printStackTrace() }.launchIn(this)
 
 
         var counter = 0
         while (isActive) {
             delay(500)
-            logger.info("Sending message number ${counter + 1}")
-            client.sendJson("magix-demo") {
+            val index = (counter++).toString()
+            logger.info("Sending message number $index")
+            client.sendJson("magix-demo", id = index) {
                 put("message", "Hello world!")
-                put("index", counter++)
+                put("index", index)
             }
         }
 

magix/magix-server/src/main/kotlin/ru/mipt/npm/magix/server/magixModule.kt

@@ -84,6 +84,9 @@ private fun ApplicationCall.buildFilter(): MagixMessageFilter {
     )
 }
 
+/**
+ * Attache magix http/sse and websocket-based rsocket event loop + statistics page to existing [MutableSharedFlow]
+ */
 public fun Application.magixModule(magixFlow: MutableSharedFlow<GenericMagixMessage>, route: String = "/") {
     if (featureOrNull(WebSockets) == null) {
         install(WebSockets)
@@ -107,11 +110,7 @@ public fun Application.magixModule(magixFlow: MutableSharedFlow<GenericMagixMess
 
     routing {
         route(route) {
-            post {
-                val message = call.receive<GenericMagixMessage>()
-                magixFlow.emit(message)
-            }
-            get("loop-state") {
+            get("state") {
                 call.respondHtml {
                     body {
                         h1 { +"Magix loop statistics" }
@@ -140,12 +139,19 @@ public fun Application.magixModule(magixFlow: MutableSharedFlow<GenericMagixMess
                 }
                 call.respondSse(sseFlow)
             }
+            post("broadcast") {
+                val message = call.receive<GenericMagixMessage>()
+                magixFlow.emit(message)
+            }
             //rSocket server. Filter from Payload
             rSocket("rsocket", acceptor = magixAcceptor(magixFlow))
         }
     }
 }
 
+/**
+ * Create a new loop [MutableSharedFlow] with given [buffer] and setup magix module based on it
+ */
 public fun Application.magixModule(route: String = "/", buffer: Int = 100) {
     val magixFlow = MutableSharedFlow<GenericMagixMessage>(buffer)
     magixModule(magixFlow, route)

magix/magix-server/src/main/kotlin/ru/mipt/npm/magix/server/server.kt

@@ -57,10 +57,16 @@ public fun CoroutineScope.startMagixServer(
         val zmqPubSocketPort: Int = MagixEndpoint.DEFAULT_MAGIX_ZMQ_PUB_PORT
         val zmqPullSocketPort: Int = MagixEndpoint.DEFAULT_MAGIX_ZMQ_PULL_PORT
         logger.info("Starting magix zmq server on pub port $zmqPubSocketPort and pull port $zmqPullSocketPort")
-        launchMagixServerZmqSocket(magixFlow, zmqPubSocketPort = zmqPubSocketPort, zmqPullSocketPort = zmqPullSocketPort)
+        launchMagixServerZmqSocket(
+            magixFlow,
+            zmqPubSocketPort = zmqPubSocketPort,
+            zmqPullSocketPort = zmqPullSocketPort
+        )
     }
 
-    return embeddedServer(CIO, port = port) {
+    return embeddedServer(CIO, host = "localhost", port = port) {
         magixModule(magixFlow)
+    }.apply {
+        start()
     }
 }

magix/magix-server/src/main/kotlin/ru/mipt/npm/magix/server/zmqMagixServerSocket.kt

@@ -1,12 +1,9 @@
 package ru.mipt.npm.magix.server
 
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Job
+import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
-import kotlinx.coroutines.isActive
-import kotlinx.coroutines.launch
 import org.slf4j.LoggerFactory
 import org.zeromq.SocketType
 import org.zeromq.ZContext
@@ -17,7 +14,7 @@ public fun CoroutineScope.launchMagixServerZmqSocket(
     localHost: String = "tcp://*",
     zmqPubSocketPort: Int = MagixEndpoint.DEFAULT_MAGIX_ZMQ_PUB_PORT,
     zmqPullSocketPort: Int = MagixEndpoint.DEFAULT_MAGIX_ZMQ_PULL_PORT,
-): Job = launch {
+): Job = launch(Dispatchers.IO) {
     val logger = LoggerFactory.getLogger("magix-server-zmq")
 
     ZContext().use { context ->
@@ -33,11 +30,10 @@ public fun CoroutineScope.launchMagixServerZmqSocket(
         //launch pulling job
         val pullSocket = context.createSocket(SocketType.PULL)
         pullSocket.bind("$localHost:$zmqPullSocketPort")
+        pullSocket.receiveTimeOut = 500
         //suspending loop while pulling is active
-
         while (isActive) {
-            //This is a blocking call.
-            val string: String? = pullSocket.recvStr(zmq.ZMQ.ZMQ_DONTWAIT)
+            val string: String? = pullSocket.recvStr()
             if (string != null) {
                 logger.debug("Received: $string")
                 val message = MagixEndpoint.magixJson.decodeFromString(genericMessageSerializer, string)
@@ -46,3 +42,4 @@ public fun CoroutineScope.launchMagixServerZmqSocket(
         }
     }
 }
+

magix/magix-zmq/src/main/kotlin/ru/mipt/npm/magix/zmq/ZmqMagixEndpoint.kt

@@ -43,7 +43,7 @@ public class ZmqMagixEndpoint<T>(
             while (activeFlag) {
                 try {
                     //This is a blocking call.
-                    val string: String? = socket.recvStr(zmq.ZMQ.ZMQ_DONTWAIT)
+                    val string: String? = socket.recvStr()
                     if (string != null) {
                         val message = MagixEndpoint.magixJson.decodeFromString(serializer, string)
                         send(message)