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scala - Scala Play HTTP 和 gRPC

问题描述

我有一个带有 Scala Play 的 HTTP 后端。工作正常。现在我想在它上面设置一个 gRPC-API（理论上应该可以）。

要设置 gRPC，我基本上遵循akka-quickstart

我可以运行sbt compile并在target/../ dic中获取我生成的 Scala 类。但是如果我尝试运行sbt run我会得到

--- (Running the application, auto-reloading is enabled) ---

[warn] a.u.ManifestInfo - You are using version 2.6.5 of Akka, but it appears you (perhaps indirectly) also depend on older versions of related artifacts. You can solve this by adding an explicit dependency on version 2.6.5 of the [akka-discovery] artifacts to your project. See also: https://doc.akka.io/docs/akka/current/common/binary-compatibility-rules.html#mixed-versioning-is-not-allowed
[error] java.lang.IllegalStateException: You are using version 2.6.5 of Akka, but it appears you (perhaps indirectly) also depend on older versions of related artifacts. You can solve this by adding an explicit dependency on version 2.6.5 of the [akka-discovery] artifacts to your project. See also: https://doc.akka.io/docs/akka/current/common/binary-compatibility-rules.html#mixed-versioning-is-not-allowed

所以我知道我使用的一些库对于 Akka 2.6.5 来说太旧了，但我不明白如何在较低的 Akka 版本上设置我的服务。

我的插件.sbt

addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.8.2")
addSbtPlugin("org.foundweekends.giter8" % "sbt-giter8-scaffold" % "0.11.0")
addSbtPlugin("com.lightbend.akka.grpc" % "sbt-akka-grpc" % "1.0.0-M1")
resolvers += Resolver.bintrayRepo("playframework", "maven")
libraryDependencies += "com.lightbend.play" %% "play-grpc-generators" % "0.8.2"

我的 build.sbt


name := "smartmarkt"
version := "1.0-SNAPSHOT"
scalaVersion := "2.13.2"

lazy val root = (project in file("."))
  .enablePlugins(PlayScala, PlayAkkaHttp2Support, AkkaGrpcPlugin)

import play.grpc.gen.scaladsl.PlayScalaServerCodeGenerator
akkaGrpcExtraGenerators += PlayScalaServerCodeGenerator
libraryDependencies += "com.lightbend.play" %% "play-grpc-runtime" % "0.8.2"

libraryDependencies += guice
libraryDependencies += "org.scalatestplus.play" %% "scalatestplus-play" % "5.0.0" % Test

标签： scalaplayframeworkakkaakka-httpakka-grpc

解决方案

查看您的直接依赖项：

"com.lightbend.play" %% "play-grpc-runtime" % "0.8.2"取决于 akka-discovery 2.6.4。

您正在使用取决于 Akka 版本 2.6.5 的 Play 2.8.2。

只需将 akka-discovery 2.6.5 的依赖添加到您的依赖项中：

libraryDependencies += "com.typesafe.akka" %% "akka-discovery" % "2.6.5"

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