如何在节点js控制器文件中引用弹性搜索JavaScript客户端库

Question

I am doing node.js RESTapi in express framework. I want to integrate elastic search to my project. So I installed elastic search JavaScript client library and add these codes in app.js .

var client = new elasticsearch.Client({
    host: 'localhost:9200',
    log: 'trace'
});

client.ping({
    requestTimeout: 30000,
}, function (error) {
    if (error) {
        console.error('elasticsearch cluster is down!');
    } else {
        console.log('All is well');
    }
});

and I am getting ' All is well '. But how do I refer this client in my controller files.

Answer 1

Passing Arguments :

Pass your variable as arguments to your import function, Like this you can pass variable from one file to another file.

//app.js
var client = new elasticsearch.Client({
    host: 'localhost:9200',
    log: 'trace'
});
var catRouters = require("categorry.controller.js")(client);

// categorry.controller.js
module.exports = function (client) {
    ....
    return { create, read, update, readById, categoriesByCity, live_search };
};

Using Global Variables :

Set your variable into Node.js global object to use in other files, Node.js global objects are global in nature and available in all modules.

//app.js
var client = new elasticsearch.Client({
    host: 'localhost:9200',
    log: 'trace'
});
global.client = client;

// categorry.controller.js
....
consoel.log(global.client);