egg-rpc-generator是什么

什么是egg-rpc-generator，RPC tools for egg framework

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egg-rpc-generator源码仓库：源码仓库
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egg-rpc-generator使用教程帮助文档

egg-rpc-generator

RPC tools for egg framework

Install

$ npm i egg-rpc-generator -g

Usage

1. Command-line interface (cli) usage

$ egg-rpc-generator -h

  Usage: egg-rpc-generator [options]

  Options:

    -b, --base [base]            the base directory of the project
    -p, --plugin [plugin]        the plugins used in generation process
    -f, --framework [framework]  specify framework that can be absolute path or npm package
    -k, --keep-case              keeps field casing instead of converting to camel case
    -h, --help                   output usage information

-b, --base the egg project root folder, default is process.cwd()
-p, --plugin the plugins will be used in generation process, by default protobuf plugin will be activated
-f, --framework specify the custom egg framework name or path
-k, --keep-case keeps field casing instead of converting to camel case

run egg-rpc-generator under the egg project root folder

$ egg-rpc-generator

Create /home/admin/project proxy
[ProtoRPCPlugin] found "com.rpc.test.ProtoService" in proto file
[ProtoRPCPlugin] save all proto info into "/home/admin/project/run/proto.json"
------------------------------------------------
All done

2. Usage with `package.json` scripts

{
  "scripts": {
    "rpc": "egg-rpc-generator"
  }
}

Run arbitrary package scripts

$ npm run rpc

Create /home/admin/project proxy
[ProtoRPCPlugin] found "com.rpc.test.ProtoService" in proto file
[ProtoRPCPlugin] save all proto info into "/home/admin/project/run/proto.json"
------------------------------------------------
All done

Build-in Plugin

Protobuf Plugin

To generate rpc schema and proxy files from *.proto files

step 1: put your *.proto files into $base/proto folder

.
├── app
├── config
│   ├── config.default.js
│   └── proxy.js
├── package.json
└── proto
    └── ProtoService.proto

proto/ProtoService.proto

syntax = "proto3";

package com.alipay.sofa.rpc.test;

// 可选
option java_multiple_files = false;

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;
}

step 2: config the config/proxy.js

module.exports = {
  group: 'SOFA',
  errorAsNull: false,
  services: [{
    appName: 'pb',
    responseTimeout: 100,
    api: {
      ProtoService: {
        interfaceName: 'com.alipay.sofa.rpc.test.ProtoService',
        version: '1.0',
        method: {
          echoObj: {
            responseTimeout: 3000,
          },
        },
      },
    },
  }],
};

step 3: run egg-rpc-generator under the project folder

will generate app/proxy/ProtoService.js and run/proto.json

.
├── app
│   └── proxy
│       └── ProtoService.js
├── config
│   ├── config.default.js
│   └── proxy.js
├── package.json
├── proto
│   └── ProtoService.proto
└── run
    └── proto.json

app/proxy/ProtoService.js

// 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.rpcClient.createConsumer({
    interfaceName: 'com.alipay.sofa.rpc.test.ProtoService',
    targetAppName: 'pb',
    version: '1.0',
    group: 'SOFA',
    proxyName: 'ProtoService',
    responseTimeout: 100,
  });

  if (!consumer) {
    // `app.config['pb.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,
        responseTimeout: 3000,
      });
    }
  }

  return ProtoService;
};
/* eslint-enable */

Jar2Proxy Plugin

To generate rpc proxy from jar.

step 1: config config/proxy.js

Please refer to jar2proxy configuration for detail.

step 2: put jar file into $app_root/assembly folder

.
├── app
├── assembly
│   ├── dubbo-demo-api-1.0-SNAPSHOT-sources.jar
│   ├── dubbo-demo-api-1.0-SNAPSHOT.jar
│   ├── jar2proxy-facade-1.0.0-sources.jar
│   └── jar2proxy-facade-1.0.0.jar
├── config
│   └── proxy.js
└── package.json

step 3: run egg-rpc-generator under the project folder

will generate following folders:

app/proxy all proxy files.
app/proxy_class all class definitions
app/proxy_enums all enums definitions

Jsdoc2Jar

To generator jave interface definitions(jars) from JavaScript comments.

step 1: config config/config.default.js

exports.rpc = {
  server: {
    namespace: 'com.eggjs.xxx',
    // group: 'xxx',
    // version: '1.0.0',
    // pom: {
    //   version: '1.0.0',
    //   groupId: 'com.eggjs.facade',
    //   artifactId: 'your-artifactId',
    // },
  },
};

step 2: write rpc service with js comments

// $app_root/rpc/HelloService.js

/**
 * say hello
 * @param {String} name - user name
 * @return {String} hello words
 * @rpc
 */
exports.sayHello = async function (name) {
  return 'hello ' + name;
};

step 3: run egg-rpc-generator under the project folder

will generate:

$app_root/src: java interface definitions source code
$app_root/target: the output of mvn clean install

Write Your Plugin

You can write your own egg-rpc-generator plugin.

Write a plugin, and publish it to NPM.

module.exports = async (units, { baseDir }) => {
  // do something
};

Use plugin:

install plugin from NPM, then use it with egg-rpc-generator:

$ egg-rpc-generator -p pluginName1,pluginName2,...

License

MIT

egg-rpc-generator