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如何使用akka http或alpakka访问Unix域套接字上的REST API?

alpakka akka-http

Murray Todd Williams · 技术社区 · 8 年前

我想使用/var/lib/docker.sock unix域套接字访问docker api。我看到过一些示例,您可以使用(现代版本的)curl调用API,如下所示:

curl --unix-socket /var/run/docker.sock http:/containers/json

其中rest命令用/containers/json路径表示。我很高兴看到Alpakka Unix域套接字适配器,但您似乎只能发送和接收原始字节。有什么优雅的方法可以做到这一点吗?或者我必须手动构建一个HTTP头,并手动管理所有困难的东西?

3 回复 | 直到 8 年前

dvim 8 年前

ClientLayer

jrudolph 8 年前

akka/akka-http#2139

val scalaV = "2.12.6"
val akkaV = "2.5.14"
val akkaHttpV = "10.1.3"

libraryDependencies ++= Seq(
  "com.typesafe.akka" %% "akka-http" % akkaHttpV,
  "com.typesafe.akka" %% "akka-http-spray-json" % akkaHttpV,
  "com.typesafe.akka" %% "akka-stream" % akkaV,
  "com.lightbend.akka" %% "akka-stream-alpakka-unix-domain-socket" % "0.20",
)

import java.io.File
import java.net.InetSocketAddress

import akka.actor.ActorSystem
import akka.http.scaladsl.ClientTransport
import akka.http.scaladsl.Http
import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport
import akka.http.scaladsl.model.HttpRequest
import akka.http.scaladsl.model.HttpResponse
import akka.http.scaladsl.settings.ClientConnectionSettings
import akka.http.scaladsl.settings.ConnectionPoolSettings
import akka.http.scaladsl.unmarshalling.Unmarshal
import akka.stream.ActorMaterializer
import akka.stream.alpakka.unixdomainsocket.scaladsl.UnixDomainSocket
import akka.stream.scaladsl.Flow
import akka.util.ByteString
import spray.json.JsValue

import scala.concurrent.Future

object DockerSockMain extends App {
  object DockerSockTransport extends ClientTransport {
    override def connectTo(host: String, port: Int, settings: ClientConnectionSettings)(implicit system: ActorSystem): Flow[ByteString, ByteString, Future[Http.OutgoingConnection]] = {
      // ignore everything for now

      UnixDomainSocket().outgoingConnection(new File("/var/run/docker.sock"))
        .mapMaterializedValue { _ =>
          // Seems that the UnixDomainSocket.OutgoingConnection is never completed? It works anyway if we just assume it is completed
          // instantly
          Future.successful(Http.OutgoingConnection(InetSocketAddress.createUnresolved(host, port), InetSocketAddress.createUnresolved(host, port)))
        }
    }
  }

  implicit val system = ActorSystem()
  implicit val mat = ActorMaterializer()
  import system.dispatcher

  val settings = ConnectionPoolSettings(system).withTransport(DockerSockTransport)

  import SprayJsonSupport._
  def handleResponse(response: HttpResponse): Future[String] =
    // TODO: create docker json model classes and directly marshal to them
    Unmarshal(response).to[JsValue].map(_.prettyPrint)

  Http().singleRequest(HttpRequest(uri = "http://localhost/images/json"), settings = settings)
    .flatMap(handleResponse)
    .onComplete { res =>
      println(s"Got result: [$res]")
      system.terminate()
    }
}

Murray Todd Williams 8 年前

GET /v1.24/containers/json HTTP/1.1\n
Host: localhost\n
\n\n

StackOverflow question here