egg-rpc-like

This plugin allows developers to access remote servers in the form of RPC, whether it is an http request, a database operation or use another RPC.

中文说明

Install

$ npm i egg-rpc-like --save

Usage

// {app_root}/config/plugin.js
exports.rpcLike = {
  enable: true,
  package: 'egg-rpc-like',
};

// config/config.default.js
const generators = require('egg-rpc-like');

exports.rpcLike = {
  default: {
    $generator: generator.simpleCurl(data=>data), // or generator.functionCurl
  },
  clients: {
    serviceA: { // object name
      host: 'http://your.site.com',
      $members: [
        'test',
        { $key:'test2', api:'sample'},
      ],
    }
  },
};

//use it in your controller or service
let data = await ctx.rpcl.serviceA.test({id:1}); // get data from http://your.site.com/test?id=1
let data = await app.rpcl.serviceA.test2(); // get data from http://your.site.com/sample

Configuration

• The generation of rpcl objects is based on obj-gen-9
• Each child of rpcl will have an additional member app, which can be accessed inside this function via this.app. Reference here
• $generator is used to generate your rpcLike object. You can use the default simpleCurl or functionCurl, or you can write your own generator.
• The format of the configuration depends on $generator, and different generators require different configuration formats.
• More detailed configuration can refer to config.default.js

simpleCurl

• simpleCurl needs to pass a function to process the data from curl() to the result the user wants, in the format function(data}{return data;}
• The function generated by simpleCurl is in the form of async function(params){}, where params is options.data in curl().
• When using simpleCurl, you must configure host, otherwise an error will be thrown.
• Member can be in two formats: {$key:'name', api:'', options:''} and 'name', where the latter will be parsed as {$key:'name', api: 'name' }
• The default options for simpleCurl are {method:'GET',dataType:'json'}, which can also be specified in member or config
• The configuration can use the onFail function to handle request failures.

functionCurl

• functionCurl requires that the returned data be a JSON and the format must be {err:-1,msg:'msg'} or {data:data}
• The function generated by functionCurl is in the form of async function(...argments){}, where argments will be processed as an array and stringed as a parameter arg.
• When using functionCurl, you must configure host, otherwise an error will be thrown.
• Member can be in two formats: {$key:'name', api:'', options:''} and 'name', where the latter will be parsed as {$key:'name', api: 'name' }
• The default options for functionCurl are {method:'GET',dataType:'json'}, which can also be specified in member or config
• The configuration can use the onFail function to handle request failures, and the onError function to handle RPC method errors.

Custom generator

Reference here

Server example of functionCurl

// app/controller/sample.js
const Controller = require('egg').Controller;
class SampleController extends Controller {
  async sample() {
    const { ctx, service } = this;
    try {
        const args = JSON.parse(ctx.request.query.arg);
        const result = await service.sample(...args);
        ctx.body = { data: result };
      } catch (e) {
        ctx.body = {
          err: -1,
          msg: e.message,
        };
      }
  }
}
module.exports = SampleController;

// app/service/sample.js
const Service = require('egg').Service;

class SampleService extends Service {
  async sample(a, b, c = 0) {
    return a + b + c;
  }
}

module.exports = SampleService;

Unit tests

npm test

License

MIT
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