本文通过 Step by Step 的形式介绍了 Eggjs 和 SOFA（Java）是如何进行互联互通的，涵盖了 RPC 的服务发现、接口定义、本地代理生成、服务端实现等各方面，期望展现给你一个相对完整的 Nodejs RPC 解决方案。考虑到社区的接受度、多语言友好性等因素，接下来的示例采用 protobuf 作为 RPC 的序列化方式。

一、准备工作

注意： 本文以 macOS 为例，其他操作系统的安装、使用方法请自行 google。

• 安装 nodejs >= 8.0.0

  • 下载安装包：https://nodejs.org/en/download/

  • 执行安装

• 安装 zookeeper

$ brew install zookeeper

• 启动 zookeeper 服务

$ zkServer start ZooKeeper JMX enabled by default Using config: /usr/local/etc/zookeeper/zoo.cfg Starting zookeeper ... STARTED

• 克隆 SOFARPC Java 的示例仓库

SOFARPC 的更多信息可以参考官方文档

git clone git@github.com:gxcsoccer/sofa-rpc-java-demo.git

• 安装 egg-init

$ npm i egg-init -g

二、创建工程

• 通过 egg-init 初始化项目脚手架，选择 simple 模板，接下来根据实际情况填写必要信息

$ egg-init ? Please select a boilerplate type (Use arrow keys)  ────────────── simple - Simple egg app boilerplate  ts - Simple egg && typescript app boilerplate  empty - Empty egg app boilerplate  plugin - egg plugin boilerplate  framework - egg framework boilerplate

• 进入生成好的项目目录，并安装依赖

$ cd /rpc-demo $ npm i

• 安装 egg-sofa-rpc 插件和 egg-rpc-generator 工具

$ npm i egg-sofa-rpc --save $ npm i egg-rpc-generator --save-dev

• 配置 package.json 的 scripts 节点，增加一个命令 rpc 如下

{  "scripts": {    "start": "egg-scripts start --daemon --title=egg-server-rpc-demo",    "stop": "egg-scripts stop --title=egg-server-rpc-demo",    "dev": "egg-bin dev",    "debug": "egg-bin debug",    "test": "npm run lint -- --fix && npm run test-local",    "test-local": "egg-bin test",    "cov": "egg-bin cov",    "lint": "eslint .",    "ci": "npm run lint && npm run cov",    "autod": "autod",    "rpc": "egg-rpc-generator"  }
}

• 配置 config/plugin.js 开启 egg-sofa-rpc 插件

// config/plugin.js

exports.sofaRpc = {  enable: true,  package: 'egg-sofa-rpc'
};

三、定义接口

protobuf 有自己的接口定义语言，详细可以参考官方文档。

# ProtoService.proto syntax = "proto3"; package com.alipay.sofa.rpc.protobuf; option java_multiple_files = true; // 可选 option java_outer_classname = "ProtoServiceModels"; // 可选 service ProtoService {    rpc echoObj (EchoRequest) returns (EchoResponse) {} } message EchoRequest {    string name = 1;    Group group = 2; } message EchoResponse {    int32 code = 1;    string message = 2; } enum Group {    A = 0;    B = 1; }

上面这个 ProtoService.proto 文件定义了一个服务：com.alipay.sofa.rpc.protobuf.ProtoService，它有一个叫 echoObj 的方法，入口参数类型是 EchoRequest，返回值类型是 EchoResponse。

四、调用 Java 暴露的 RPC 服务

1、启动 Java 服务端

进入上面克隆的 Java 示例仓库，运行 ProtobufServiceServerMain

2、配置服务发现参数

我们默认的服务发现依赖于 zookeeper，所以需要配置一个 zk 的地址。在 config/config.{env}.js 中配置如下：

// config/config.default.js
'use strict';

exports.sofaRpc = {  registry: {    address: '127.0.0.1:2181', // zk 地址指向本地 2181 端口  }
};

3、获取接口定义

在 egg 项目根目录下创建 proto 目录，然后将上面定义的 ProtoService.proto 文件放到里

. ├── app │   ├── controller │   │   └── home.js │   └── router.js ├── config │   ├── config.default.js │   └── plugin.js ├── package.json └── proto    └── ProtoService.proto

4、配置要调用的接口

在 config/proxy.js 中配置要调用的服务信息

'use strict';

module.exports = {  services: [{    appName: 'sofarpc',    api: {      ProtoService: 'com.alipay.sofa.rpc.protobuf.ProtoService',    }  }]
};

• appName(必选): 服务提供方的应用名，如果没有可以任意起一个

• api(必选): 接口列表，是一个 key-value 键值对，key 是生成的 proxy 文件名，value 是接口名（如果要跟精细的配置也可以是一个对象）

config/proxy.js 详细的配置说明可以参考文档

5、生成调用代理

在根目录下运行 npm run rpc，生成调用的 proxy 文件

$ npm run rpc
> rpc-demo@1.0.0 rpc /egg-rpc-demo
> egg-rpc-generator

[EggRpcGenerator] framework: /egg-rpc-demo/node_modules/egg, baseDir: /egg-rpc-demo
[ProtoRPCPlugin] found "com.alipay.sofa.rpc.protobuf.ProtoService" in proto file
[ProtoRPCPlugin] save all proto info into "/egg-rpc-demo/run/proto.json"

运行成功以后，会发现生成了两个文件

• app/proxy/ProtoService.js - 调用服务的代理文件

• run/proto.json - 从 .proto 文件中导出的接口信息，是一个 json 格式文件

.
├── app │   ├── controller │   │   └── home.js │   ├── proxy │   │   └── ProtoService.js │   └── router.js ├── config │   ├── config.default.js │   ├── plugin.js │   └── proxy.js ├── package.json ├── proto │   └── ProtoService.proto └── run    └── proto.json

生成的 app/proxy/ProtoService.js 文件内容如下（注意：不要手动去改这个文件）：

// Don't modified this file, it's auto created by egg-rpc-generator

'use strict';

const path = require('path');

/* eslint-disable */
/* istanbul ignore next */
module.exports = app => {  const consumer = app.sofaRpcClient.createConsumer({    interfaceName: 'com.alipay.sofa.rpc.protobuf.ProtoService',    targetAppName: 'sofarpc',    version: '1.0',    group: 'SOFA',    proxyName: 'ProtoService',    responseTimeout: 3000,  });  if (!consumer) {    // `app.config['sofarpc.rpc.service.enable'] = false` will disable this consumer    return;  }  app.beforeStart(async() => {    await consumer.ready();  });  class ProtoService extends app.Proxy {    constructor(ctx) {      super(ctx, consumer);    }    async echoObj(req) {      return await consumer.invoke('echoObj', [ req ], {        ctx: this.ctx, codecType: 'protobuf',      });    }  }  return ProtoService;
};
/* eslint-enable */

6、调用代理类，实现业务逻辑

上面定义的这个 ProtoService 这个类，会挂载在 app.proxyClasses 上。通过 ctx.proxy.protoService（注意这里是小驼峰）可以访问它的实例，这样我们就可以在业务中调用 RPC 的服务了，例如：下面我们在 home controller 调用 ProtoService 的 echoObj 方法

// app/controller/home.js

'use strict';

const Controller = require('egg').Controller;

class HomeController extends Controller {  async index() {    const { ctx } = this;    const res = await ctx.proxy.protoService.echoObj({      name: 'gxcsoccer',  group: 'A',    });    ctx.body = res;  }
}

module.exports = HomeController;

7、启动应用，调试

$ npm run dev

在浏览器中访问 http://127.0.0.1:7001/，得到下面的结果，说明成功了

五、暴露 RPC 服务给 Java 调用

这回换做 Nodejs 来暴露同样的服务，Java 端作为消费者

1、配置服务发现参数

和上面作为调用者的配置一样

// config/config.default.js

'use strict';

exports.sofaRpc = {  registry: {    address: '127.0.0.1:2181', // zk 地址指向本地 2181 端口  }
};

2、定义接口

同样需要先定义接口，然后将 .proto 文件放到 proto 目录下，然后运行 npm run rpc，这些和上面作为调用者时都一样

3、配置 RPC 服务端的参数

通过 config/config.{env}.js 配置 RPC 服务端的参数

// config/config.default.js

'use strict';

exports.sofaRpc = {  server: {    namespace: 'com.alipay.sofa.rpc.protobuf'  }
};

其中最主要的配置就是 namespace，其他配置都可以缺省：

• namespace(必选): 接口的命名空间，所有的暴露的接口默认都在该命名空间下

• selfPublish(可选): 是否每个 worker 进程独立暴露服务。nodejs 多进程模式下，如果多个进程共享一个端口，在 RPC 这种场景可能造成负载不均，所以 selfPublish 默认为 true，代表每个进程独立监听端口和发布服务

• port(可选): 服务监听的端口（注意：在 selfPublish=true 时，监听的端口是基于这个配置生成的）

• maxIdleTime(可选): 客户端连接如果在该配置时长内没有任何流量，则主动断开连接

• responseTimeout(可选): 服务端建议的超时时长，具体的超时还是以客户端配置为准

• codecType(可选): 推荐的序列化方式，默认为 protobuf

4、实现接口逻辑

在 app/rpc 目录下创建 ProtoService.js 文件，用于实现接口逻辑

'use strict';

exports.echoObj = async function(req) {  return {    code: 200,    message: 'hello ' + req.name + ', you are in ' + req.group,  };
};

5、启动应用，发布服务

$ npm run dev

6、Java 作为客户端调用服务

进入上面克隆的 Java 示例仓库，运行 ProtobufServiceClientMain

执行的结果如下：

Sofa-Middleware-Log SLF4J : Actual binding is of type [ com.alipay.sofa.rpc Log4j2 ] 2018-06-11 18:07:59,977 INFO  [main] com.alipay.sofa.common.log:report:30 - Sofa-Middleware-Log SLF4J : Actual binding is of type [ com.alipay.sofa.rpc Log4j2 ] 2018-06-11 18:08:00,419 INFO  [main] org.apache.curator.framework.imps.CuratorFrameworkImpl:start:234 - Starting 2018-06-11 18:08:00,432 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT 2018-06-11 18:08:00,432 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:host.name=30.23.232.6 2018-06-11 18:08:00,432 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:java.version=1.8.0_171 2018-06-11 18:08:00,432 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:java.vendor=Oracle Corporation 2018-06-11 18:08:00,432 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:java.home=/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre 2018-06-11 18:08:00,432 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:java.class.path=/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/tools.jar:/Users/gaoxiaochen/projj/github.com/gxcsoccer/sofa-rpc-java-demo/target/classes:/Users/gaoxiaochen/.m2/repository/com/alipay/sofa/sofa-rpc-all/5.4.0/sofa-rpc-all-5.4.0.jar:/Users/gaoxiaochen/.m2/repository/com/alipay/sofa/bolt/1.4.1/bolt-1.4.1.jar:/Users/gaoxiaochen/.m2/repository/com/alipay/sofa/common/sofa-common-tools/1.0.12/sofa-common-tools-1.0.12.jar:/Users/gaoxiaochen/.m2/repository/org/slf4j/slf4j-api/1.7.21/slf4j-api-1.7.21.jar:/Users/gaoxiaochen/.m2/repository/org/javassist/javassist/3.20.0-GA/javassist-3.20.0-GA.jar:/Users/gaoxiaochen/.m2/repository/io/netty/netty-all/4.1.25.Final/netty-all-4.1.25.Final.jar:/Users/gaoxiaochen/.m2/repository/com/alipay/sofa/hessian/3.3.0/hessian-3.3.0.jar:/Users/gaoxiaochen/.m2/repository/com/alipay/sofa/tracer-core/2.1.1/tracer-core-2.1.1.jar:/Users/gaoxiaochen/.m2/repository/io/opentracing/opentracing-api/0.22.0/opentracing-api-0.22.0.jar:/Users/gaoxiaochen/.m2/repository/io/opentracing/opentracing-noop/0.22.0/opentracing-noop-0.22.0.jar:/Users/gaoxiaochen/.m2/repository/io/opentracing/opentracing-mock/0.22.0/opentracing-mock-0.22.0.jar:/Users/gaoxiaochen/.m2/repository/io/opentracing/opentracing-util/0.22.0/opentracing-util-0.22.0.jar:/Users/gaoxiaochen/.m2/repository/org/jboss/resteasy/resteasy-netty4/3.0.12.Final/resteasy-netty4-3.0.12.Final.jar:/Users/gaoxiaochen/.m2/repository/org/jboss/resteasy/resteasy-jaxrs/3.0.12.Final/resteasy-jaxrs-3.0.12.Final.jar:/Users/gaoxiaochen/.m2/repository/org/jboss/resteasy/jaxrs-api/3.0.12.Final/jaxrs-api-3.0.12.Final.jar:/Users/gaoxiaochen/.m2/repository/org/jboss/spec/javax/annotation/jboss-annotations-api_1.1_spec/1.0.1.Final/jboss-annotations-api_1.1_spec-1.0.1.Final.jar:/Users/gaoxiaochen/.m2/repository/javax/activation/activation/1.1.1/activation-1.1.1.jar:/Users/gaoxiaochen/.m2/repository/org/apache/httpcomponents/httpclient/4.3.6/httpclient-4.3.6.jar:/Users/gaoxiaochen/.m2/repository/org/apache/httpcomponents/httpcore/4.3.3/httpcore-4.3.3.jar:/Users/gaoxiaochen/.m2/repository/commons-logging/commons-logging/1.1.3/commons-logging-1.1.3.jar:/Users/gaoxiaochen/.m2/repository/commons-codec/commons-codec/1.6/commons-codec-1.6.jar:/Users/gaoxiaochen/.m2/repository/commons-io/commons-io/2.1/commons-io-2.1.jar:/Users/gaoxiaochen/.m2/repository/net/jcip/jcip-annotations/1.0/jcip-annotations-1.0.jar:/Users/gaoxiaochen/.m2/repository/org/jboss/resteasy/resteasy-client/3.0.12.Final/resteasy-client-3.0.12.Final.jar:/Users/gaoxiaochen/.m2/repository/org/jboss/resteasy/resteasy-jackson-provider/3.0.12.Final/resteasy-jackson-provider-3.0.12.Final.jar:/Users/gaox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IDEA.app/Contents/lib/idea_rt.jar 2018-06-11 18:08:00,432 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:java.library.path=/Users/gaoxiaochen/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:. 2018-06-11 18:08:00,433 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:java.io.tmpdir=/var/folders/q4/4nwl16wn32ndm69rzh1zyvhh0000gn/T/ 2018-06-11 18:08:00,433 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:java.compiler=<NA> 2018-06-11 18:08:00,433 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:os.name=Mac OS X 2018-06-11 18:08:00,433 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:os.arch=x86_64 2018-06-11 18:08:00,433 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:os.version=10.13.4 2018-06-11 18:08:00,433 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:user.name=gaoxiaochen 2018-06-11 18:08:00,433 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:user.home=/Users/gaoxiaochen 2018-06-11 18:08:00,433 INFO  [main] org.apache.zookeeper.ZooKeeper:logEnv:100 - Client environment:user.dir=/Users/gaoxiaochen/projj/github.com/gxcsoccer/sofa-rpc-java-demo 2018-06-11 18:08:00,434 INFO  [main] org.apache.zookeeper.ZooKeeper:<init>:438 - Initiating client connection, connectString=127.0.0.1:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@2e005c4b 2018-06-11 18:08:00,459 INFO  [main-SendThread(127.0.0.1:2181)] org.apache.zookeeper.ClientCnxn:logStartConnect:975 - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error) 2018-06-11 18:08:00,547 INFO  [main-SendThread(127.0.0.1:2181)] org.apache.zookeeper.ClientCnxn:primeConnection:852 - Socket connection established to 127.0.0.1/127.0.0.1:2181, initiating session 2018-06-11 18:08:00,555 INFO  [main-SendThread(127.0.0.1:2181)] org.apache.zookeeper.ClientCnxn:onConnected:1235 - Session establishment complete on server 127.0.0.1/127.0.0.1:2181, sessionid = 0x1000894bb75004f, negotiated timeout = 40000 2018-06-11 18:08:00,558 INFO  [main-EventThread] org.apache.curator.framework.state.ConnectionStateManager:postState:228 - State change: CONNECTED 2018-06-11 18:08:00,594 WARN  [main] org.apache.curator.utils.ZKPaths:<clinit>:76 - The version of ZooKeeper being used doesn't support Container nodes. CreateMode.PERSISTENT will be used instead. Sofa-Middleware-Log SLF4J : Actual binding is of type [ com.alipay.remoting Log4j2 ] 2018-06-11 18:08:00,645 INFO  [SOFA-CLI-CONN-com.alipay.sofa.rpc.protobuf.ProtoService-3-T1] com.alipay.sofa.common.log:report:30 - Sofa-Middleware-Log SLF4J : Actual binding is of type [ com.alipay.remoting Log4j2 ] 2018-06-11 18:08:00,703 WARN No Root logger was configured, creating default ERROR-level Root logger with Console appender /Users/gaoxiaochen/logs/tracelog/rpc-client-digest.log -> /Users/gaoxiaochen/logs/tracelog/rpc-client-digest.log.2018-06-09 200: hello zhang, you are in 0 200: hello zhang, you are in 0 200: hello zhang, you are in 0 200: hello zhang, you are in 0 200: hello zhang, you are in 0 200: hello zhang, you are in 0 200: hello zhang, you are in 0 200: hello zhang, you are in 0

相关资源链接：

• SOFA Java Demo :

  https://github.com/gxcsoccer/sofa-rpc-java-demo

• Eggjs RPC Example : 

  https://github.com/eggjs/examples/tree/master/sofa-rpc

• SOFARPC Node：

  https://github.com/alipay/sofa-rpc-node

• SOFABolt Node：

  https://github.com/alipay/sofa-bolt-node

• Eggjs：

  https://eggjs.org

• SOFARPC: 

  https://github.com/alipay/sofa-rpc

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