使用spring boot集成grpc
创始人
2024-06-02 05:56:58
0

目录

创建maven父工程spring-boot-grpc

创建模块spring-boot-grpc-lib

创建模块local-server(gRPC服务端)

创建模块local-client(gRPC客户端)


创建maven父工程spring-boot-grpc

创建springboot项目,勾选springboot-web即可


4.0.0pomspring-boot-grpc-liblocal-serverlocal-clientorg.springframework.bootspring-boot-starter-parent2.5.6 com.chenjspring-boot-grpc0.0.1-SNAPSHOTspring-boot-grpcDemo project for Spring Boot1.8org.springframework.bootspring-boot-starter-weborg.springframework.bootspring-boot-starter-testtest

创建模块spring-boot-grpc-lib

在父工程spring-boot-grpc下新建maven模块,名为spring-boot-grpc-lib


spring-boot-grpccom.chenj0.0.1-SNAPSHOT4.0.0spring-boot-grpc-libUTF-81.81.8io.grpcgrpc-netty-shaded1.37.0io.grpcgrpc-protobuf1.37.0io.grpcgrpc-stub1.37.0 org.apache.tomcatannotations-api6.0.53providedkr.motd.mavenos-maven-plugin1.6.2org.xolstice.maven.pluginsprotobuf-maven-plugin0.6.1com.google.protobuf:protoc:3.17.3:exe:${os.detected.classifier}grpc-javaio.grpc:protoc-gen-grpc-java:1.37.0:exe:${os.detected.classifier}compilecompile-custom

在spring-boot-grpc-lib模块的src/main/proto目录下新增名为helloworld.proto的文件,这里面定义了一个gRPC服务,里面含有一个接口,并且还有这个接口的入参和返回结果的定义:

syntax = "proto3";option java_multiple_files = true;
option java_package = "com.chenj.grpc.lib";
option java_outer_classname = "HelloWorldProto";// The greeting service definition.
service Simple {// Sends a greetingrpc SayHello (HelloRequest) returns (HelloReply) {}
}// The request message containing the user's name.
message HelloRequest {string name = 1;
}// The response message containing the greetings
message HelloReply {string message = 1;
}

proto文件已经做好,接下来要根据这个文件来生成Java代码

SimpleGrpc里面有抽象类SimpleImplBase,制作gRPC服务的时候需要继承该类,另外,如果您要远程调用gRPC的sayHello接口,就会用到SimpleGrpc类中的SimpleStub类,其余的HelloReply、HelloRequest这些则是入参和返回的数据结构定义

创建模块local-server(gRPC服务端)

在父工程下面新建名为local-server的springboot模块,

gRPC 服务端使用一下命令添加 Maven 依赖项

net.devhgrpc-server-spring-boot-starter2.12.0.RELEASE

依赖上面的spring-boot-grpc-lib模块

com.chenjspring-boot-grpc-lib0.0.1-SNAPSHOT

完整的pom.xml文件


4.0.0spring-boot-grpccom.chenj0.0.1-SNAPSHOTcom.chenjlocal-server0.0.1-SNAPSHOTlocal-serverDemo project for Spring Boot1.8net.devhgrpc-server-spring-boot-starter2.12.0.RELEASEcom.chenjspring-boot-grpc-lib0.0.1-SNAPSHOTorg.projectlomboklombok

springboot应用,配置文件内容如下:

spring:application:name: spring-boot-grpc-server
# gRPC有关的配置,这里只需要配置服务端口号
grpc:server:port: 9898
server:port: 8080

新建拦截类LogGrpcInterceptor.java,每当gRPC请求到来后该类会先执行,这里是将方法名字在日志中打印出来,您可以对请求响应做更详细的处理:

package com.chenj.springbootgrpcserver.interceptor;import io.grpc.Metadata;
import io.grpc.ServerCall;
import io.grpc.ServerCallHandler;
import io.grpc.ServerInterceptor;
import lombok.extern.slf4j.Slf4j;@Slf4j
public class LogGrpcInterceptor implements ServerInterceptor {@Overridepublic  ServerCall.Listener interceptCall(ServerCall serverCall, Metadata metadata,ServerCallHandler serverCallHandler) {log.info(serverCall.getMethodDescriptor().getFullMethodName());return serverCallHandler.startCall(serverCall, metadata);}
}

为了让LogGrpcInterceptor可以在gRPC请求到来时被执行,需要做相应的配置,如下所示,在普通的bean的配置中添加注解即可:

package com.chenj.springbootgrpcserver.config;import com.chenj.springbootgrpcserver.interceptor.LogGrpcInterceptor;
import io.grpc.ServerInterceptor;
import net.devh.boot.grpc.server.interceptor.GrpcGlobalServerInterceptor;
import org.springframework.context.annotation.Configuration;@Configuration(proxyBeanMethods = false)
public class GlobalInterceptorConfiguration {@GrpcGlobalServerInterceptorServerInterceptor logServerInterceptor() {return new LogGrpcInterceptor();}
}

应用启动类很简单:

package com.chenj.springbootgrpcserver;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class SpringBootGrpcServerApplication {public static void main(String[] args) {SpringApplication.run(SpringBootGrpcServerApplication.class, args);}}

接下来是最重要的service类,gRPC服务在此处对外暴露出去,完整代码如下

package com.chenj.springbootgrpcserver.service;import com.chenj.grpc.lib.HelloReply;
import com.chenj.grpc.lib.HelloRequest;
import com.chenj.grpc.lib.SimpleGrpc;
import io.grpc.stub.StreamObserver;
import net.devh.boot.grpc.server.service.GrpcService;import java.util.Date;@GrpcService
public class GrpcServerService extends SimpleGrpc.SimpleImplBase {@Overridepublic void sayHello(HelloRequest request,StreamObserver responseObserver) {HelloReply reply = HelloReply.newBuilder().setMessage("你好, " + request.getName() + ", " + new Date()).build();responseObserver.onNext(reply);responseObserver.onCompleted();}
}

上述GrpcServerService.java中有几处需要注意:

是使用@GrpcService注解,再继承SimpleImplBase,这样就可以借助grpc-server-spring-boot-starter库将sayHello暴露为gRPC服务;

SimpleImplBase是前文中根据proto自动生成的java代码,在spring-boot-grpc-lib模块中;

sayHello方法中处理完毕业务逻辑后,调用HelloReply.onNext方法填入返回内容;

调用HelloReply.onCompleted方法表示本次gRPC服务完成;

至此,gRPC服务端编码就完成了,咱们接着开始客户端开发

创建模块local-client(gRPC客户端)

在父工程grpc-turtorials下面新建名为local-client的模块

gRPC客户端使用一下命令添加 Maven 依赖项:

net.devhgrpc-client-spring-boot-starter2.12.0.RELEASE

依赖上面的spring-boot-grpc-lib模块

com.chenjspring-boot-grpc-lib0.0.1-SNAPSHOT

完整的pom.xml文件


4.0.0spring-boot-grpccom.chenj0.0.1-SNAPSHOTcom.chenjlocal-client0.0.1-SNAPSHOTlocal-clientDemo project for Spring Boot1.8net.devhgrpc-client-spring-boot-starter2.12.0.RELEASEcom.chenjspring-boot-grpc-lib0.0.1-SNAPSHOTorg.springframework.bootspring-boot-maven-plugin

应用配置文件src/main/resources/application.yml,注意address的值就是gRPC服务端的信息,我这里local-server和local-client在同一台电脑上运行,请您根据自己情况来设置:

server:port: 8088
spring:application:name: local-clientgrpc:client:# gRPC配置的名字,GrpcClient注解会用到local-grpc-server:# gRPC服务端地址address: 'static://127.0.0.1:9898'enableKeepAlive: truekeepAliveWithoutCalls: truenegotiationType: plaintext

新建拦截类LogGrpcInterceptor,与服务端的拦截类差不多,不过实现的接口不同:

package com.chenj.springbootgrpcclient.interceptor;import io.grpc.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;public class LogGrpcInterceptor implements ClientInterceptor {private static final Logger log = LoggerFactory.getLogger(LogGrpcInterceptor.class);@Overridepublic  ClientCall interceptCall(MethodDescriptor method,CallOptions callOptions, Channel next) {log.info(method.getFullMethodName());return next.newCall(method, callOptions);}
}

为了让拦截类能够正常工作,即发起gRPC请求的时候被执行,需要新增一个配置类:

package com.chenj.springbootgrpcclient.config;import com.chenj.springbootgrpcclient.interceptor.LogGrpcInterceptor;
import io.grpc.ClientInterceptor;
import net.devh.boot.grpc.client.interceptor.GrpcGlobalClientInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;@Order(Ordered.LOWEST_PRECEDENCE)
@Configuration(proxyBeanMethods = false)
public class GlobalClientInterceptorConfiguration {@GrpcGlobalClientInterceptorClientInterceptor logClientInterceptor() {return new LogGrpcInterceptor();}
}

启动类:

package com.chenj.springbootgrpcclient;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class SpringBootGrpcClientApplication {public static void main(String[] args) {SpringApplication.run(SpringBootGrpcClientApplication.class, args);}}

接下来是最重要的服务类GrpcClientService

package com.chenj.springbootgrpcclient.service;import com.chenj.grpc.lib.HelloReply;
import com.chenj.grpc.lib.HelloRequest;
import com.chenj.grpc.lib.SimpleGrpc;
import io.grpc.StatusRuntimeException;
import net.devh.boot.grpc.client.inject.GrpcClient;
import org.springframework.stereotype.Service;@Service
public class GrpcClientService {@GrpcClient("local-grpc-server")private SimpleGrpc.SimpleBlockingStub simpleStub;public String sendMessage(final String name) {try {final HelloReply response = this.simpleStub.sayHello(HelloRequest.newBuilder().setName(name).build());return response.getMessage();} catch (final StatusRuntimeException e) {return "FAILED with " + e.getStatus().getCode().name();}}
}

上述GrpcClientService类有几处要注意的地方:

用@Service将GrpcClientService注册为spring的普通bean实例;

用@GrpcClient修饰SimpleBlockingStub,这样就可以通过grpc-client-spring-boot-starter库发起gRPC调用,被调用的服务端信息来自名为local-grpc-server的配置;

SimpleBlockingStub来自前文中根据helloworld.proto生成的java代码;

SimpleBlockingStub.sayHello方法会远程调用local-server应用的gRPC服务;

为了验证gRPC服务调用能否成功,再新增个web接口,接口内部会调用GrpcClientService.sendMessage,这样咱们通过浏览器就能验证gRPC服务是否调用成功了:

package com.chenj.springbootgrpcclient.controller;import com.chenj.springbootgrpcclient.service.GrpcClientService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;@RestController
public class GrpcClientController {@Autowiredprivate GrpcClientService grpcClientService;@RequestMapping("/")public String printMessage(@RequestParam(defaultValue = "will") String name) {return grpcClientService.sendMessage(name);}
}

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