Scala 无法从Akka群集客户端发送协议缓冲区消息

我正在尝试使用Play Framework（Scala）作为Akka群集客户端向另一个运行我的应用程序服务的Akka群集发送消息

以下是我所做的：

我使用协议缓冲区在不同的模块中定义了消息，并在运行项目的服务和Play app之间共享消息（使用git子模块）

已在端口2560启动服务

akka {

  remote.netty.tcp.port=${?AKKA_REMOTE_PORT}
  remote.netty.tcp.hostname=127.0.0.1

  cluster {

    seed-nodes = [
      "akka.tcp://ApiServiceActorSystem@127.0.0.1:2560"
    ]

    auto-down-unreachable-after = 10s
  }

  extensions = ["akka.cluster.client.ClusterClientReceptionist"]

  loglevel = DEBUG

  actor {

    serializer {
      proto = "akka.remote.serialization.ProtobufSerializer"
    }

   serialization-bindings {
      "com.myproject.api.common.messages.IsValidClientMessage$IsValidClient" = proto
    }

    serialize-messages = on

    provider = "akka.cluster.ClusterActorRefProvider"

    debug {
      receive = on
    }
  }
}

并使用以下Akka配置运行Play应用程序：

akka {

  remote.netty.tcp.port=2552
  remote.netty.tcp.hostname=127.0.0.1
  remote.enabled-transports = ["akka.remote.netty.tcp"]

  cluster {

    seed-nodes = [
      "akka.tcp://Api@127.0.0.1:2552"
    ]

   auto-down-unreachable-after = 10s
  }

  extensions = ["akka.cluster.client.ClusterClientReceptionist"]

  loglevel = DEBUG

   actor {

     serializer {
       proto = "akka.remote.serialization.ProtobufSerializer"
     }

    serialization-bindings {
    "com.myproject.api.common.messages.IsValidClientMessage$IsValidClient" = proto
    }

    serialize-messages = on

    provider = "akka.cluster.ClusterActorRefProvider"

    debug {
      receive = on
    }
  }
}

这是我一直试图向ApiServiceSystem发送消息的代码：

package com.myproject.api.akka.actors.socket

import ...

class ClientActor extends Actor with ActorLogging {

  ClusterClientReceptionist(context.system).registerService(self)

  val outActors: ArrayBuffer[ActorRef] = ArrayBuffer.empty
  val apiServiceClient = context.system.actorOf(ClusterClient.props(
    ClusterClientSettings(context.system).withInitialContacts(Set(ActorPath.fromString("akka.tcp://ApiServiceActorSystem@127.0.0.1:2560/system/receptionist")))
  ))

  override def receive = {
    case WatchOutActor(a) =>
      context.watch(a)
      outActors += a
    case Terminated(a) =>
      context.unwatch(a)
      outActors.remove(outActors.indexOf(a))
    case other =>

      implicit val to: Timeout = 2 seconds

      val isValidClient = IsValidClient.newBuilder() // Protocol Buffer Message

      isValidClient.setClientId(1000)
      isValidClient.setClientSecret("notsosecret")

      (apiServiceClient ? ClusterClient.Send("/user/clientActor", isValidClient.build(), false)).mapTo[Future[Either[ServiceError, Boolean]]] map { f =>
        f map {
          case Left(e) =>
            outActors foreach { a => a ! e.msg }
          case Right(bool) =>
            outActors foreach { a => a ! bool.toString }
        }
      } recover {
        case e: Exception => println(s"-=> Exception ${e.getMessage}")
      }
  }
}

object ClientActor {

  case class WatchOutActor(actorRef: ActorRef)
}

正如我从下面的日志中看到的，我的api已连接到运行服务的群集：

[DEBUG] [08/11/2016 10:11:05.936] [ApiServiceActorSystem-akka.remote.default-remote-dispatcher-24] [akka.remote.Remoting] Associated [akka.tcp://ApiServiceActorSystem@127.0.0.1:2560] <- [akka.tcp://Api@127.0.0.1:2552]
[DEBUG] [08/11/2016 10:11:05.998] [ApiServiceActorSystem-akka.remote.default-remote-dispatcher-24] [akka.serialization.Serialization(akka://ApiServiceActorSystem)] Using serializer[akka.cluster.client.protobuf.ClusterClientMessageSerializer] for message [akka.cluster.client.ClusterReceptionist$Internal$GetContacts$]
[DEBUG] [08/11/2016 10:11:06.000] [ApiServiceActorSystem-akka.actor.default-dispatcher-4] [akka.tcp://ApiServiceActorSystem@127.0.0.1:2560/system/receptionist] Client [akka.tcp://Api@127.0.0.1:2552/user/$a] gets contactPoints [akka.tcp://ApiServiceActorSystem@127.0.0.1:2560/system/receptionist] (all nodes)
[DEBUG] [08/11/2016 10:11:06.002] [ApiServiceActorSystem-akka.actor.default-dispatcher-4] [akka.tcp://ApiServiceActorSystem@127.0.0.1:2560/system/receptionist] Client [akka.tcp://Api@127.0.0.1:2552/user/$a] gets contactPoints [akka.tcp://ApiServiceActorSystem@127.0.0.1:2560/system/receptionist] (all nodes)
[DEBUG] [08/11/2016 10:11:06.002] [ApiServiceActorSystem-akka.actor.default-dispatcher-4] [akka.tcp://ApiServiceActorSystem@127.0.0.1:2560/system/receptionist] Client [akka.tcp://Api@127.0.0.1:2552/user/$a] gets contactPoints [akka.tcp://ApiServiceActorSystem@127.0.0.1:2560/system/receptionist] (all nodes)
[DEBUG] [08/11/2016 10:11:06.002] [ApiServiceActorSystem-akka.actor.default-dispatcher-4] [akka.tcp://ApiServiceActorSystem@127.0.0.1:2560/system/receptionist] Client [akka.tcp://Api@127.0.0.1:2552/user/$a] gets contactPoints [akka.tcp://ApiServiceActorSystem@127.0.0.1:2560/system/receptionist] (all nodes)
[DEBUG] [08/11/2016 10:11:06.004] [ApiServiceActorSystem-akka.remote.default-remote-dispatcher-76] [akka.serialization.Serialization(akka://ApiServiceActorSystem)] Using serializer[akka.cluster.client.protobuf.ClusterClientMessageSerializer] for message [akka.cluster.client.ClusterReceptionist$Internal$Contacts]
[DEBUG] [08/11/2016 10:11:06.033] [ApiServiceActorSystem-akka.remote.default-remote-dispatcher-76] [akka.serialization.Serialization(akka://ApiServiceActorSystem)] Using serializer[akka.serialization.JavaSerializer] for message [akka.actor.Identify]
[DEBUG] [08/11/2016 10:11:06.037] [ApiServiceActorSystem-akka.remote.default-remote-dispatcher-24] [akka.serialization.Serialization(akka://ApiServiceActorSystem)] Using serializer[akka.serialization.JavaSerializer] for message [akka.actor.ActorIdentity]
[DEBUG] [08/11/2016 10:11:06.126] [ApiServiceActorSystem-akka.remote.default-remote-dispatcher-76] [akka.serialization.Serialization(akka://ApiServiceActorSystem)] Using serializer[akka.serialization.JavaSerializer] for message [akka.remote.EndpointWriter$AckIdleCheckTimer$]
[DEBUG] [08/11/2016 10:11:07.749] [ApiServiceActorSystem-akka.remote.default-remote-dispatcher-76] [akka.serialization.Serialization(akka://ApiServiceActorSystem)] Using serializer[akka.cluster.client.protobuf.ClusterClientMessageSerializer] for message [akka.cluster.client.ClusterReceptionist$Internal$Heartbeat$]

---

如何序列化我的邮件？为什么运行时会发生

ClassNotFoundException

？任何帮助都将不胜感激

akka remote和protobuf 3.x生成的类似乎存在类加载问题（即使您使用

proto2

定义）。可以使用protobuf 2.5编译器istead 3.x解决此问题：

您必须自己编译它，因为没有预编译的二进制文件。只需转到下载的目录并运行以下命令：

./configure
make
make install

编译v2.5

protoc

binary后，使用它重新构建java类并使用它们。将在akka发行proto 3支持版

---

澄清：它不是

protobuf java

版本，而是由

protoc

binary 3.0

生成的类。您需要将Lite和V3类显式绑定到您的proto序列化程序：

akka {
  loglevel = "INFO"

  actor {
    provider = "akka.remote.RemoteActorRefProvider"

    serializers {
      proto = "akka.remote.serialization.ProtobufSerializer" # or use your own..
    }

    serialization-bindings {
      "com.google.protobuf.Message" = proto
      "com.google.protobuf.GeneratedMessageLite" = proto
      "com.google.protobuf.GeneratedMessageV3" = proto
    }
  }

---

代码中可能有两个问题：1。已编译的protobuf不在客户端和服务器中，或者2。由于java scala互操作性非常棘手，您可能会发现protobuf无法正确解析定义消息协议的对象内的case类。您使用哪个protobuf java库版本？@frank_neff其2.6.1Akka 2.4.x在内部使用protobuf 2.5的着色版本，这不应干扰您自己的协议Protobuf3.x依赖项。您是否已将3.x运行时依赖项添加到项目中？我已将运行时依赖项添加到3.0.0。这不是java库，而是protoc编译器v2（works）v3（ClassNotFoundException）生成的类。我也遇到了同样的问题

./configure
make
make install

akka {
  loglevel = "INFO"

  actor {
    provider = "akka.remote.RemoteActorRefProvider"

    serializers {
      proto = "akka.remote.serialization.ProtobufSerializer" # or use your own..
    }

    serialization-bindings {
      "com.google.protobuf.Message" = proto
      "com.google.protobuf.GeneratedMessageLite" = proto
      "com.google.protobuf.GeneratedMessageV3" = proto
    }
  }