技术：SpringBoot 2.0.5.RELEASE + Grpc 1.15.0 运行环境：JDK 1.8
概述：SpringBoot框架中集成Grpc服务
详细
一.背景
Spring Boot是由Pivotal团队提供的全新框架，其设计目的是用来简化新Spring应用的初始搭建以及开发过程。该框架使用了特定的方式来进行配置，从而使开发人员不再需要定义样板化的配置。通过这种方式，Spring Boot致力于在蓬勃发展的快速应用开发领域(rapid application development)成为领导者。
Grpc 由 google 开发，是一款语言中立、平台中立、开源的远程过程调用(RPC)系统。
项目定位是电商平台和WMS系统中间的插件服务，wms采用.net语言开发，电商平台采用java开发，所以出现了多语言间的数据交换，开始考虑使用json协议，方便快捷，但是考虑到效率和系统发展的问题，考虑使用RPC框架，斟酌之后敲定为GRPC。
但是，我们拓展服务使用的SpringBoot，Grpc和SpringBoot集成的文章不是很多，大部分都是采用github上*-springboot.grpc.starter的项目，看了一下，并不是很感兴趣，所以自己根据官网的demo，尝试与SpringBoot集成，所以在这和大家分享下
二. 准备工作
开发环境
Spring Boot 2.0.5.RELEASE
Grpc 1.15.0
Inteliji Idea 2018.3
项目截图
三.实现过程
1. 配置SpringBoot项目
- Pom文件增加
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
</dependencies>- 编写启动类
public static void main(String[] args) {
// 启动SpringBoot web
SpringApplication.run(Launcher.class, args);
}2. 增加GRPC支持和GRPC代码生成工具，集成GrpcServer端
- 增加POM文件
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-netty-shaded</artifactId>
<version>1.15.0</version>
</dependency>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-protobuf</artifactId>
<version>1.15.0</version>
</dependency>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-stub</artifactId>
<version>1.15.0</version>
</dependency>- 增加maven工具
<build>
<extensions>
<extension>
<groupId>kr.motd.maven</groupId>
<artifactId>os-maven-plugin</artifactId>
<version>1.5.0.Final</version>
</extension>
</extensions>
<plugins>
<plugin>
<groupId>org.xolstice.maven.plugins</groupId>
<artifactId>protobuf-maven-plugin</artifactId>
<version>0.5.1</version>
<configuration>
<protocArtifact>com.google.protobuf:protoc:3.5.1-1:exe:${os.detected.classifier}</protocArtifact>
<pluginId>grpc-java</pluginId>
<pluginArtifact>io.grpc:protoc-gen-grpc-java:1.15.0:exe:${os.detected.classifier}</pluginArtifact>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>compile-custom</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>- 编写Server端实现类
public class HelloWorldService extends HelloWorldServiceGrpc.HelloWorldServiceImplBase {
@Override
public void welcome(HelloWorld.NameRequest request, StreamObserver<HelloWorld.EchoResponse> responseObserver) {
HelloWorld.EchoResponseOrBuilder echoResponseOrBuilder = HelloWorld.EchoResponse.newBuilder();
((HelloWorld.EchoResponse.Builder) echoResponseOrBuilder).setMergename("welcome " + request.getName());
responseObserver.onNext(((HelloWorld.EchoResponse.Builder) echoResponseOrBuilder).build());
responseObserver.onCompleted();
}
}- 增加Grpc启动器
@Component("grpcLauncher")
public class GrpcLauncher {
private Logger logger = LoggerFactory.getLogger(Launcher.class);
/**
* 定义Grpc Server
*/
private Server server;
@Value("${grpc.server.port}")
private Integer grpcServerPort;
/**
* GRPC 服务启动方法
* @param grpcServiceBeanMap
*/
public void grpcStart(Map<String, Object> grpcServiceBeanMap) {
try{
SelfSignedCertificate ssc = new SelfSignedCertificate();
ServerBuilder serverBuilder = ServerBuilder.forPort(grpcServerPort).useTransportSecurity(ssc.certificate(), ssc.privateKey());
for (Object bean : grpcServiceBeanMap.values()){
serverBuilder.addService((BindableService) bean);
logger.info(bean.getClass().getSimpleName() + " is regist in Spring Boot");
}
server = serverBuilder.build().start();
logger.info("grpc server is started at " + grpcServerPort);
server.awaitTermination();
Runtime.getRuntime().addShutdownHook(new Thread(()->{grpcStop();}));
} catch (IOException e){
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
/**
* GRPC 服务Stop方法
*/
private void grpcStop(){
if (server != null){
server.shutdownNow();
}
}
}- 添加自定义注解用于扫描Grpc服务
/**
* 自定义注解，用于获取Spring扫描到的类
*/
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component
public @interface GrpcService {
}- 在SpringBoot中增加Grpc启动器，并将Spring管理的类，添加到Grpc服务中
/**
* Spring Boot 启动器
*/
@SpringBootApplication
public class Launcher {
public static void main(String[] args) {
// 启动SpringBoot web
ConfigurableApplicationContext configurableApplicationContext = SpringApplication.run(Launcher.class, args);
Map<String, Object> grpcServiceBeanMap = configurableApplicationContext.getBeansWithAnnotation(GrpcService.class);
GrpcLauncher grpcLauncher = configurableApplicationContext.getBean("grpcLauncher",GrpcLauncher.class);
grpcLauncher.grpcStart(grpcServiceBeanMap);
}
}至此Server端，集成完毕
3. 增加Client端
- 获取Chanel
@Component
public class GrpcClientMananer {
@Value("${grpc.client.host}")
private String host;
@Value("${grpc.client.port}")
private Integer port;
public ManagedChannel getChannel(){
NettyChannelBuilder ncb = NettyChannelBuilder.forAddress(host, port).sslContext(SslContextBuilder.forClient()
.sslProvider(OpenSsl.isAlpnSupported() ? SslProvider.OPENSSL : SslProvider.JDK)
.ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
.trustManager(InsecureTrustManagerFactory.INSTANCE)
.applicationProtocolConfig(
new ApplicationProtocolConfig(
ApplicationProtocolConfig.Protocol.ALPN,
ApplicationProtocolConfig.SelectorFailureBehavior.NO_ADVERTISE,
ApplicationProtocolConfig.SelectedListenerFailureBehavior.ACCEPT,
ApplicationProtocolNames.HTTP_2,
ApplicationProtocolNames.HTTP_1_1))
.build());
return ncb.build();
}
}- 调用方式
@Component
public class HelloWorldClient {
@Autowired
private GrpcClientMananer grpcClientMananer;
public void call(){
ManagedChannel channel = grpcClientMananer.getChannel();
HelloWorld.NameRequestOrBuilder nameRequestOrBuilder = HelloWorld.NameRequest.newBuilder();
((HelloWorld.NameRequest.Builder) nameRequestOrBuilder).setName("Geek");
HelloWorldServiceGrpc.HelloWorldServiceBlockingStub stub = HelloWorldServiceGrpc.newBlockingStub(channel);
HelloWorld.EchoResponse echoResponse = stub.welcome(((HelloWorld.NameRequest.Builder) nameRequestOrBuilder).build());
System.out.println(echoResponse.getMergename());
}
}
`