Gatling CoAP插件示例

以下是一个简单的Gatling CoAP插件示例：

package com.example.gatling.coap

import akka.actor.ActorSystem
import akka.stream.ActorMaterializer
import io.gatling.commons.validation._
import io.gatling.core.action.builder.ActionBuilder
import io.gatling.core.session.Session
import io.gatling.core.structure.ScenarioContext
import io.gatling.core.util.NameGen
import org.eclipse.californium.core.coap.{CoAP, Request, Response}
import org.eclipse.californium.core.network.{CoapEndpoint, EndpointContext}

import scala.concurrent.Future
import scala.util.{Failure, Success}

/**
  * A Gatling CoAP action that sends a CoAP request and waits for the response.
  */
class CoapAction(requestName: String, request: Request, endpoint: CoapEndpoint)(implicit system: ActorSystem, materializer: ActorMaterializer)
  extends ActionBuilder with NameGen {

  override def build(ctx: ScenarioContext, next: ActionBuilder): akka.actor.ActorRef = {
    import ctx.{coreComponents, protocolComponentsRegistry}

    val coapComponents = protocolComponentsRegistry.components(CoapProtocol.CoapProtocolKey)

    coreComponents.actorSystem.actorOf(CoapActionActor.props(requestName, request, endpoint, coapComponents.coapClient), genName("coapRequest"))
  }

  private class CoapActionActor(requestName: String, request: Request, endpoint: CoapEndpoint, coapClient: CoapClient) extends akka.actor.Actor with NameGen {

    implicit val ec = context.dispatcher

    override def receive: Receive = {
      case session: Session =>
        val outcome = sendRequest(request, endpoint, coapClient)
          .map(response => processResponse(session, response))
          .recover {
            case e: Exception => session.markAsFailed(Some(e.getMessage)).failure
          }

        outcome.onComplete(result => context.parent ! result)
    }

    private def sendRequest(request: Request, endpoint: CoapEndpoint, coapClient: CoapClient): Future[Response] = {
      val promise = scala.concurrent.Promise[Response]()

      request.addMessageObserver(new org.eclipse.californium.core.coap.MessageObserver {
        override def onAcknowledgement(): Unit = {}

        override def onReject(): Unit = {}

        override def onResponse(response: Response): Unit = {
          promise.success(response)
        }

        override def onTimeout(): Unit = {
          promise.failure(new Exception("Request timed out"))
        }
      })

      coapClient.sendRequest(request, endpoint, new EndpointContext())
      promise.future
    }

    private def processResponse(session: Session, response: Response): Validation[Unit] = {
      val statusCode = response.getCode.value

      if (statusCode >= CoAP.ResponseCode.BAD_REQUEST.value) {
        session.markAsFailed(Some(s"CoAP request failed with status $statusCode")).failure
      } else {
        session.markAsSucceeded.success
      }
    }
  }
}

该插件包含一个CoapAction类，该类负责发送CoAP请求和等待响应。该类使用了Eclipse Californium库来发送和接收CoAP消息。在发送请求之后，CoapActionActor类将等待响应，并将响应发送回父Actor，以便Gatling可以将其与其他请求进行协调。

为了使用该插件，您需要在测试中创建一个CoapProtocol实例，并将其传递给Gatling的setUp方法，例如：

import io.gatling.core.Predef._
import io.gatling.coap.Predef._
import org.eclipse.californium.core.coap.{CoAP, Request}

class MyScenario extends Simulation {

  val coapProtocol = coap("coap://localhost:5683")

  val request = new Request(CoAP.Code.GET)
  request.setURI("/hello")

  val scn = scenario("CoAP request")
    .exec(coap(requestName = "getHello", request = request, endpoint = coapProtocol.endpoint))

  setUp(scn.inject(atOnceUsers(1))).protocols(coapProtocol)
}

在这个示例中，我们创建了一个CoAP请求，并使用coap方法创建了一个CoapProtocol实例。我们还创建了一个场景，并在其中执行了一个CoapAction，该动作将发送我们的请求并等待响应。最后，我们使用setUp方法将场景和CoapProtocol实例传递给Gatling，以便它可以运行我们的测试。