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redis pub or sub nodejs
Restu Wahyu Saputra
on Feb 24, 2021
more example redis pub/sub -> https://github.com/restuwahyu13/express-todo-redisredis pub or sub nodejs
Restu Wahyu Saputra
on Feb 24, 2021
// subscriber
const IORedis = require('ioredis')
const chalk = require('chalk')
const { Publisher } = require('./util.publisher')
class Subscriber {
constructor(configs = { key: '' }) {
this._key = configs.key
this._keyFrom = Publisher.get()
}
_redisConnect() {
const ioRedis = new IORedis({
host: '127.0.0.1',
port: 6379,
maxRetriesPerRequest: 50,
connectTimeout: 5000,
enableReadyCheck: true,
enableAutoPipelining: true
})
return ioRedis
}
async getString(keyName) {
if (this._key == this._keyFrom) {
const ioRedis = this._redisConnect()
const response = await ioRedis.get(keyName)
await ioRedis.expire(keyName, 60)
if (response) {
return Promise.resolve(response)
}
return {}
} else {
return Promise.reject(chalk.red(new Error(`invalid key Subscriber: ${this._key} and Publisher: ${this._keyFrom}`)))
}
}
async getMap(keyName) {
if (this._key == this._keyFrom) {
const ioRedis = this._redisConnect()
const response = await ioRedis.hgetall(keyName)
await ioRedis.expire(keyName, 60)
if (response) {
return Promise.resolve(response)
}
return {}
} else {
return Promise.reject(chalk.red(new Error(`invalid key Subscriber: ${this._key} and Publisher: ${this._keyFrom}`)))
}
}
async getArray(keyName) {
if (this._key == this._keyFrom) {
const ioRedis = this._redisConnect()
const response = await ioRedis.hgetall(keyName)
await ioRedis.expire(keyName, 60)
if (response) {
return Promise.resolve(JSON.parser(response).data)
}
return {}
} else {
return Promise.reject(chalk.red(new Error(`invalid key Subscriber: ${this._key} and Publisher: ${this._keyFrom}`)))
}
}
async getResponse() {
if (this._key == this._keyFrom) {
const ioRedis = this._redisConnect()
const response = await ioRedis.hgetall('message:speaker')
await ioRedis.expire('message:speaker', 30)
if (response) {
return Promise.resolve(response)
}
return {}
} else {
return Promise.reject(chalk.red(new Error(`invalid key Subscriber: ${this._key} and Publisher: ${this._keyFrom}`)))
}
}
}
module.exports = { Subscriber }redis pub or sub nodejs
Restu Wahyu Saputra
on Feb 24, 2021
// publisher
const IORedis = require('ioredis')
class Publisher {
constructor(configs = { key: '' }) {
this.key = configs.key
Publisher.set(configs.key)
}
static get() {
return this.key
}
static set(key = '') {
this.key = key
}
_redisConnect() {
const ioRedis = new IORedis({
host: '127.0.0.1',
port: 6379,
maxRetriesPerRequest: 50,
connectTimeout: 5000,
enableReadyCheck: true,
enableAutoPipelining: true
})
return ioRedis
}
async setString(keyName = '', data) {
const ioRedis = _redisConnect()
await ioRedis.set(keyName, data)
}
async setMap(keyName = '', data = {}) {
const ioRedis = this._redisConnect()
await ioRedis.hmset(keyName, { ...data })
}
async setArray(keyName = '', data = []) {
const ioRedis = _redisConnect()
await ioRedis.hmset(keyName, JSON.stringify({ data: data }))
}
async setResponse(data = {}) {
const ioRedis = this._redisConnect()
await ioRedis.hmset('message:speaker', { ...data })
}
}
module.exports = { Publisher }how to implement redis pub sub model using nodejs
Shy Spider
on Feb 04, 2021
var redis = require(“redis”);var subscriber = redis.createClient();subscriber.on(“message”, function (channel, message) { console.log(“Message: “ + message + “ on channel: “ + channel + “ is arrive!”);});subscriber.subscribe(“notification”);Source: medium.com
how to implement redis pub sub model using nodejs
Shy Spider
on Feb 04, 2021
var redis = require(“redis”);var publisher = redis.createClient();publisher.publish(“notification”, “{\”message\”:\”Hello world from Asgardian!\”}”, function(){ process.exit(0);});Source: medium.com
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