[GitHub] [incubator-tuweni] atoulme commented on a change in pull request #232: move ethstats module to use kotlin

[GitBox <gi...@apache.org>]

atoulme commented on a change in pull request #232:
URL: https://github.com/apache/incubator-tuweni/pull/232#discussion_r627904372



##########
File path: ethstats/src/main/kotlin/org/apache/tuweni/ethstats/EthStatsServer.kt
##########
@@ -0,0 +1,157 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.tuweni.ethstats
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.databind.node.ArrayNode
+import io.vertx.core.Vertx
+import io.vertx.core.http.HttpServer
+import io.vertx.core.http.ServerWebSocket
+import io.vertx.core.net.SocketAddress
+import io.vertx.kotlin.core.http.closeAwait
+import io.vertx.kotlin.core.http.listenAwait
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import org.apache.tuweni.eth.EthJsonModule
+import org.slf4j.LoggerFactory
+import java.io.IOException
+import java.time.Instant
+import java.util.concurrent.atomic.AtomicBoolean
+import kotlin.coroutines.CoroutineContext
+
+class EthStatsServer(
+  private val vertx: Vertx,
+  val networkInterface: String,
+  var port: Int,
+  val secret: String,
+  private val timeSupplier: () -> Instant,
+  private val nodeInfoReader: (String, NodeInfo) -> Unit,
+  private val latencyReader: (String, SocketAddress, Long) -> Unit,
+  private val pendingTxReader: (String, Long) -> Unit,
+  private val nodeStatsReader: (String, NodeStats) -> Unit,
+  private val disconnectionReader: (String) -> Unit,
+  private val blockReader: (String, BlockStats) -> Unit,
+  override val coroutineContext: CoroutineContext = Dispatchers.Default,
+) : CoroutineScope {
+
+  companion object {
+    val logger = LoggerFactory.getLogger(EthStatsServer::class.java)
+    val mapper = ObjectMapper()
+
+    init {
+      mapper.registerModule(EthJsonModule())
+    }
+  }
+
+  private var server: HttpServer? = null
+  private val started = AtomicBoolean(false)
+
+  suspend fun start() {
+    if (started.compareAndSet(false, true)) {
+      server = vertx.createHttpServer().webSocketHandler(this::connect).exceptionHandler {
+        logger.error("Exception occurred", it)
+      }.listenAwait(port, networkInterface)
+    }
+  }
+
+  suspend fun stop() {
+    if (started.compareAndSet(true, false)) {
+      server?.closeAwait()
+    }
+  }
+
+  fun connect(serverWebSocket: ServerWebSocket) {
+    logger.debug("New connection")
+    val websocket = serverWebSocket
+    websocket.accept()
+    websocket.exceptionHandler {
+      logger.debug("Error reading message", it)
+      websocket.close()
+    }
+    websocket.textMessageHandler {
+      try {
+        handleMessage(it, websocket)
+      } catch (e: IOException) {
+        logger.debug("Invalid payload", e)
+        websocket.close()
+      }
+    }
+  }
+
+  private fun handleMessage(message: String, websocket: ServerWebSocket) {
+    logger.debug("Received {}", message)
+    val event = mapper.readTree(message).get("emit") as ArrayNode
+    val command = event.get(0).textValue()
+    when (command) {
+      ("hello") -> {
+        val clientSecret = event.get(1).get("secret").textValue()
+        if (clientSecret != secret) {
+          logger.info("Client {} connected with wrong secret {}, disconnecting", websocket.remoteAddress(), clientSecret)
+          websocket.close()
+          return
+        }
+        websocket.writeTextMessage("{\"emit\":[\"ready\"]}")
+        val id = event.get(1).get("id").textValue()
+        val nodeInfo = mapper.readerFor(NodeInfo::class.java).readValue<NodeInfo>(event.get(1).get("info"))
+        nodeInfoReader(id, nodeInfo)
+      }
+      ("node-ping") -> {
+        logger.debug("Received a ping {}", event.get(1))
+        val clientTime = event.get(1).get("clientTime").longValue()
+        val payload = mapOf(Pair("clientTime", clientTime), Pair("serverTime", timeSupplier().toEpochMilli()))
+
+        val response = mapper.writer().writeValueAsString(mapOf(Pair("emit", listOf("node-pong", payload))))
+        EthStatsReporter.logger.debug("Sending {} message {}", command, message)
+        websocket.writeTextMessage(response)
+      }
+      ("latency") -> {
+        val id = event.get(1).get("id").textValue()
+        val latency = event.get(1).get("latency").longValue()
+        latencyReader(id, websocket.remoteAddress(), latency)
+      }
+      ("end") -> {
+        val id = event.get(1).get("id").textValue()
+        disconnectionReader(id)
+      }
+      ("stats") -> {
+        val id = event.get(1).get("id").textValue()
+        val nodeStats = mapper.readerFor(NodeStats::class.java).readValue<NodeStats>(event.get(1).get("stats"))
+        nodeStatsReader(id, nodeStats)
+      }
+      ("pending") -> {
+        val id = event.get(1).get("id").textValue()
+        val pendingTx = event.get(1).get("stats").get("pending").longValue()
+        pendingTxReader(id, pendingTx)
+      }
+      ("block") -> {
+        val id = event.get(1).get("id").textValue()
+        val block = mapper.readerFor(BlockStats::class.java).readValue<BlockStats>(event.get(1).get("block"))
+        blockReader(id, block)
+      }
+      ("update") -> {
+        // TODO implement

Review comment:
       if we throw an exception, it will bork the connection. We can add a handler for this behavior in a bit.
   
   For now just getting stats is great.




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