Scala 语言实战 Akka HTTP gRPC 服务开发定义.proto 文件 + 服务实现

实战 Akka HTTP gRPC 服务开发：Scala 语言下的实践

随着微服务架构的流行，服务之间的通信变得越来越重要。gRPC 是一个高性能、跨语言的 RPC 框架，它使用 Protocol Buffers 作为接口定义语言。Akka HTTP 是 Akka 框架的一部分，它提供了构建 HTTP 服务的强大工具。本文将围绕 Scala 语言，结合 Akka HTTP 和 gRPC，展示如何开发一个简单的 gRPC 服务。

准备工作

在开始之前，请确保您已经安装了以下工具：

- Scala 2.13.x 或更高版本
- sbt 1.5.x 或更高版本
- Akka HTTP 10.2.x 或更高版本
- gRPC 1.38.x 或更高版本

定义 .proto 文件

我们需要定义 gRPC 服务接口。创建一个名为 `hello.proto` 的文件，并添加以下内容：

proto syntax = "proto3";


option java_multiple_files = true;

option java_package = "com.example.grpc";

option java_outer_classname = "HelloServiceProto";
package hello;
// 定义一个简单的 gRPC 服务

service HelloService {

  // 定义一个名为 "sayHello" 的 RPC 方法

  rpc sayHello (HelloRequest) returns (HelloResponse);

}
// 定义请求和响应消息

message HelloRequest {

  string name = 1;

}

message HelloResponse { string message = 1; }

编译 .proto 文件

使用 gRPC 提供的编译器将 `.proto` 文件编译成 Scala 代码。打开终端，执行以下命令：

bash protoc --proto_path=. --scala_out=. --grpc_java_out=. hello.proto

这将生成两个 Scala 文件：`HelloServiceProto.scala` 和 `HelloServiceProtoGrpc.scala`。

创建 Akka HTTP 服务

接下来，我们将创建一个 Akka HTTP 服务来实现 gRPC 服务。创建一个名为 `HelloServiceApp` 的 Scala 项目，并添加以下依赖项到 `build.sbt` 文件中：

scala name := "HelloServiceApp"


version := "0.1"
scalaVersion := "2.13.x"

libraryDependencies ++= Seq( "com.typesafe.akka" %% "akka-http" % "10.2.x", "com.typesafe.akka" %% "akka-stream" % "10.2.x", "com.typesafe.akka" %% "akka-actor" % "10.2.x", "io.grpc" % "grpc-netty-shaded" % "1.38.x", "io.grpc" % "grpc-protobuf" % "1.38.x", "io.grpc" % "grpc-stub" % "1.38.x" )

然后，创建一个名为 `HelloServiceApp` 的 Scala 类，并添加以下内容：

```scala
import scala.concurrent.ExecutionContextExecutor
import scala.concurrent.duration._
import com.example.grpc.HelloServiceProto._
import com.example.grpc.HelloServiceProtoGrpc._
import io.grpc.stub.StreamObserver
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Scala 语言实战 Akka HTTP gRPC 服务开发定义.proto 文件 + 服务实现

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