grpc-java 常用.proto类型Java代码 demo

淩亂°似流年 2021-09-21 21:46 632阅读 0赞

> grpc-java 常用的.proto类型 demo 整理

博主近期在调研 istio，其中涉及需要将自己部门的 rpc 框架切换到 grpc-java 上，因此对 grpc-java 进行了相关调研，这里就对常用的.proto类型进行整理。

.proto文件中消息结构里用于定义字段的标准数据类型如下表所示，后面几列是.proto文件中定义的标准类型编译转换后在编程语言中的类型对照。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0FwcGx5aW5n_size_16_color_FFFFFF_t_70]  
下面将对上面提到的 .proto 类型在 Java 代码中的使用给出代码示例  
（下面的项目将在上一个示例：[grpc-java springboot 同步异步调用 demo][grpc-java springboot _ demo] 的基础上进一步扩展）

主要包含的复杂结构：`数组`，`Map`，`byte[]`，`自定义结构`，`枚举类型`

首先是 .proto 文件：

syntax = "proto3"; //指定正在使用proto3语法，没有则默认为proto2
    
    option java_package = "grpc.springboot.demo.api";
    option java_outer_classname = "ComplexStructService";
    
    package complex.struct.service;
    
    service ComplexStruct {
        //定义一个rpc方法，请求跟相应的内容，均为自定义类型
        rpc invoker (ComplexStructRequest) returns (ComplexStructResponse) {}
    }
    
    //定义请求体
    message ComplexStructRequest {
        //定义字符串类型
        string msg = 1;
        //定义浮点类型
        double num = 2;
        //定义long类型
        sint64 longNum = 3;
        //定义int类型
        sint32 shortNum = 4;
        //定义boolean类型
        bool check = 5;
        //定义int型数组
        repeated sint32 shortNumArray = 6;
        //定义字符串数组
        repeated string messageArray = 7;
        //定义map结构，k-v均为字符串
        map<string, string> testMap = 8;
        //定义枚举类型
        enumType enumTypeNum = 9;
        //定义字节数组
        bytes data = 10;
    }
    
    //定义响应类型
    message ComplexStructResponse {
        //包含了自定义Result
        Result result = 1;
        //自定义Result的数组
        repeated Result resultList = 2;
        //自定义Result的map
        map<string, Result> resultMap = 3;
    }
    
    message Result {
        sint64 id = 1;
        string message = 2;
    }
    
    //枚举类型
    enum enumType {
        ENUM_TYPE_0 = 0;
        ENUM_TYPE_1 = 1;
        ENUM_TYPE_2 = 2;
        ENUM_TYPE_3 = 3;
    }

对于 List 或者是 Map，代码添加时，都可以通过 `addAllXxxx` 整个 List/Map 对象赋值，或者通过 `addXxx` 的方法，依次进行赋值。具体见客户端与服务端代码。

客户端代码：

@RestController
    public class ComplexStructController { 
    
        private static final Logger logger = LoggerFactory.getLogger(ComplexStructController.class);
    
        private GrpcClient client;
    
        @Autowired
        public ComplexStructController(GrpcClient client) { 
            this.client = client;
        }
    
    	// 这里构建了一个请求，用于触发客户端调用服务端
        @GetMapping("/complex/struct/hello")
        public String hello() { 
            List<String> allMessageArray = new ArrayList<>();
            allMessageArray.add("string1");
            allMessageArray.add("string2");
            allMessageArray.add("string3");
    
            Map<String, String> testMap = new HashMap<>();
            testMap.put("key1", "value1");
            testMap.put("key2", "value2");
    
            String string = "hello world";
            byte[] bytes = string.getBytes();
    
            ComplexStructService.ComplexStructRequest request = ComplexStructService.ComplexStructRequest
                    .newBuilder()
                    // 添加基础的数据类型
                    .setMsg("msg")
                    .setNum(12.5)
                    .setLongNum(12L)
                    .setShortNum(10)
                    .setCheck(true)
                    .addShortNumArray(100)
                    .addShortNumArray(200)
                    .addShortNumArray(300)
                    // 添加字符串数组对象
                    .addAllMessageArray(allMessageArray)
                    // 添加 map 对象
                    .putAllTestMap(testMap)
                    // 在已添加的 map 对象基础上，再添加元素
                    .putTestMap("key3", "value3")
                    .setEnumTypeNum(ComplexStructService.enumType.ENUM_TYPE_3)
                    // 不能直接将byte[]类型放入，需要通过protobuf的ByteString进行一次转换
                    .setData(ByteString.copyFrom(bytes))
                    .build();
            logger.info("Build request:{}", request);
    
            try { 
                // 获取同步存根
                ComplexStructGrpc.ComplexStructBlockingStub stub = client.getComplexStructBlockingStub();
                ComplexStructService.ComplexStructResponse response = stub.invoker(request);
                logger.info("Get response:{}", response);
                return "success";
            } catch (StatusRuntimeException e) { 
                logger.info(" Error Received - Error code : {}", e.getStatus().getCode());
            }
            return "error";
        }
    }

服务端代码：

@Component
    public class ComplexStructServiceImpl extends ComplexStructGrpc.ComplexStructImplBase { 
    
        private static final Logger logger = LoggerFactory.getLogger(ComplexStructServiceImpl.class);
    
        @Override
        public void invoker(ComplexStructService.ComplexStructRequest request,
                            StreamObserver<ComplexStructService.ComplexStructResponse> responseObserver) { 
            logger.info("receive request:{}", request);
            // 对于基础的数据类型，直接通过 getXxx() 获取
            String msg = request.getMsg();
            double num = request.getNum();
            long longNum = request.getLongNum();
            int shortNum = request.getShortNum();
            boolean check = request.getCheck();
            logger.info("msg:{}, num:{}, longNum:{}, shortNum:{}, check:{}", msg, num, longNum, shortNum, check);
    
            // 对于数组，可以获取完整的 List 对象，也可以获取数组对象的长度，再通过下标获取特定的对象
            List<Integer> shortNumList = request.getShortNumArrayList();
            int shortNumListNum = request.getShortNumArrayCount();
            int shortNumListFirstNum = request.getShortNumArray(0);
            logger.info("shortNumListNum:{}, shortNumListFirstNum:{}, shortNumList[1]:{}",
                    shortNumListNum, shortNumListFirstNum, shortNumList.get(1)) ;
    
            // 字符串数组同上
            List<String> messageArray = request.getMessageArrayList();
            int messageArrayNum = request.getMessageArrayCount();
            String messageArrayFirstMsg =request.getMessageArray(0);
            logger.info("messageArrayNum:{}, messageArrayFirstMsg:{}, messageArray[1]:{}",
                    messageArrayNum, messageArrayFirstMsg, messageArray.get(1)) ;
    
            // 对于 map 类型，也可以直接获取到完整的对象
            Map<String, String> testMap = request.getTestMapMap();
            for (String key : testMap.keySet()) { 
                logger.info("testMap: key:{}, value:{}", key, testMap.get(key));
            }
    
            // 获取枚举类型 或 直接获取枚举类型的值
            ComplexStructService.enumType enumType = request.getEnumTypeNum();
            int enumTypeValue = request.getEnumTypeNumValue();
            logger.info("enumType:{}, enumTypeValue:{}", enumType, enumTypeValue);
    
    		// 获取字节数组
            byte[] bytes = request.getData().toByteArray();
            logger.info("data:{}", new String(bytes));
    
            // 构建响应类
            ComplexStructService.Result result = buildResult(100L, "single result");
    
            // 构建响应数组
            List<ComplexStructService.Result> resultList = new ArrayList<>();
            resultList.add(buildResult(1L, "result list 1"));
            resultList.add(buildResult(2L, "result list 2"));
    
            // 构建响应 Map 结构
            Map<String, ComplexStructService.Result> resultMap = new HashMap<>();
            resultMap.put("resultMap-key1", buildResult(1L, "result map 1"));
            resultMap.put("resultMap-key2", buildResult(2L, "result map 2"));
    
            ComplexStructService.ComplexStructResponse response =
                    ComplexStructService.ComplexStructResponse
                            .newBuilder()
                            .setResult(result)
                            // 加入定义的 Result 数组
                            .addAllResultList(resultList)
                            // 在 Result 数组上再加入新的 Result 对象
                            .addResultList(buildResult(3L, "result list 3"))
                            // 加入定义的 Map 对象
                            .putAllResultMap(resultMap)
                            // 在 Map 对象上再加入新的元素
                            .putResultMap("resultMap-key3", buildResult(3L, "result map 3"))
                            .build();
            logger.info("return response:{}", response);
            responseObserver.onNext(response);
            responseObserver.onCompleted();
        }
    
        private ComplexStructService.Result buildResult(long id, String msg) { 
            return ComplexStructService.Result
                    .newBuilder()
                    .setId(id)
                    .setMessage(msg)
                    .build();
        }
    }

运行结果：

服务端：

2021-04-01 00:46:29.870  INFO 6460 --- [ault-executor-0] c.p.g.d.s.s.ComplexStructServiceImpl     : receive request:msg: "msg"
    num: 12.5
    longNum: 12
    shortNum: 10
    check: true
    shortNumArray: 100
    shortNumArray: 200
    shortNumArray: 300
    messageArray: "string1"
    messageArray: "string2"
    messageArray: "string3"
    testMap {
      key: "key1"
      value: "value1"
    }
    testMap {
      key: "key2"
      value: "value2"
    }
    testMap {
      key: "key3"
      value: "value3"
    }
    enumTypeNum: ENUM_TYPE_3
    data: "hello world"
    
    2021-04-01 00:46:29.879  INFO 6460 --- [ault-executor-0] c.p.g.d.s.s.ComplexStructServiceImpl     : msg:msg, num:12.5, longNum:12, shortNum:10, check:true
    2021-04-01 00:46:29.880  INFO 6460 --- [ault-executor-0] c.p.g.d.s.s.ComplexStructServiceImpl     : shortNumListNum:3, shortNumListFirstNum:100, shortNumList[1]:200
    2021-04-01 00:46:29.880  INFO 6460 --- [ault-executor-0] c.p.g.d.s.s.ComplexStructServiceImpl     : messageArrayNum:3, messageArrayFirstMsg:string1, messageArray[1]:string2
    2021-04-01 00:46:29.880  INFO 6460 --- [ault-executor-0] c.p.g.d.s.s.ComplexStructServiceImpl     : testMap: key:key1, value:value1
    2021-04-01 00:46:29.880  INFO 6460 --- [ault-executor-0] c.p.g.d.s.s.ComplexStructServiceImpl     : testMap: key:key2, value:value2
    2021-04-01 00:46:29.880  INFO 6460 --- [ault-executor-0] c.p.g.d.s.s.ComplexStructServiceImpl     : testMap: key:key3, value:value3
    2021-04-01 00:46:29.880  INFO 6460 --- [ault-executor-0] c.p.g.d.s.s.ComplexStructServiceImpl     : enumType:ENUM_TYPE_3, enumTypeValue:3
    2021-04-01 00:46:29.880  INFO 6460 --- [ault-executor-0] c.p.g.d.s.s.ComplexStructServiceImpl     : data:hello world
    2021-04-01 00:46:29.883  INFO 6460 --- [ault-executor-0] c.p.g.d.s.s.ComplexStructServiceImpl     : return response:result {
      id: 100
      message: "single result"
    }
    resultList {
      id: 1
      message: "result list 1"
    }
    resultList {
      id: 2
      message: "result list 2"
    }
    resultList {
      id: 3
      message: "result list 3"
    }
    resultMap {
      key: "resultMap-key1"
      value {
        id: 1
        message: "result map 1"
      }
    }
    resultMap {
      key: "resultMap-key2"
      value {
        id: 2
        message: "result map 2"
      }
    }
    resultMap {
      key: "resultMap-key3"
      value {
        id: 3
        message: "result map 3"
      }
    }

客户端运行结果：

2021-04-01 00:46:28.666  INFO 4616 --- [io-10088-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'
    2021-04-01 00:46:28.667  INFO 4616 --- [io-10088-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started
    2021-04-01 00:46:28.684  INFO 4616 --- [io-10088-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 17 ms
    2021-04-01 00:46:28.743  INFO 4616 --- [io-10088-exec-1] c.p.g.d.c.c.ComplexStructController      : Build request:msg: "msg"
    num: 12.5
    longNum: 12
    shortNum: 10
    check: true
    shortNumArray: 100
    shortNumArray: 200
    shortNumArray: 300
    messageArray: "string1"
    messageArray: "string2"
    messageArray: "string3"
    testMap {
      key: "key1"
      value: "value1"
    }
    testMap {
      key: "key2"
      value: "value2"
    }
    testMap {
      key: "key3"
      value: "value3"
    }
    enumTypeNum: ENUM_TYPE_3
    data: "hello world"
    
    2021-04-01 00:46:29.911  INFO 4616 --- [io-10088-exec-1] c.p.g.d.c.c.ComplexStructController      : Get response:result {
      id: 100
      message: "single result"
    }
    resultList {
      id: 1
      message: "result list 1"
    }
    resultList {
      id: 2
      message: "result list 2"
    }
    resultList {
      id: 3
      message: "result list 3"
    }
    resultMap {
      key: "resultMap-key1"
      value {
        id: 1
        message: "result map 1"
      }
    }
    resultMap {
      key: "resultMap-key2"
      value {
        id: 2
        message: "result map 2"
      }
    }
    resultMap {
      key: "resultMap-key3"
      value {
        id: 3
        message: "result map 3"
      }
    }

完整的代码连接：https://github.com/Parallelline1996/Daily-Learning/tree/master/gRPC/code-repository/grpc-springboot-demo

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0FwcGx5aW5n_size_16_color_FFFFFF_t_70]: /images/20210920/b2fe465879604bb6ab38f24ab1b59c52.png
[grpc-java springboot _ demo]: https://blog.csdn.net/Applying/article/details/115024675