akka-http - 如何使用 Akka HTTP 或 Alpakka 在 unix 域套接字上访问 REST API?
问题描述
我想使用 /var/lib/docker.sock unix 域套接字访问 docker API。我已经看到可以使用(现代版本的)curl 调用 API 的示例,如下所示:
curl --unix-socket /var/run/docker.sock http:/containers/json
其中 REST 命令在 /containers/json 路径中表示。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?还是我必须手动构建 HTTP 标头并手动管理所有困难的东西?
解决方案
这是一个工作片段(另请参阅akka/akka-http#2139上的其余讨论):
构建.sbt:
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",
)
DockerSockMain.scala:
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()
}
}
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