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laravel-redis-router

Installing

composer require olegkravec/laravel-redis-router

General

laravel-redis-router is implementation similar ro Laravel MVC scheme for handling and sending Redis Pub/Sub messages

How it is working?

For example you have 2 different services, called as Service A and Service B, both of services is REST(doesnt metter) API applications, but Service B must get data from Service A. There are different way how to receive data, for example HTTP API requests, but in highload projects http requests up to version 3 is too slow for transiving data between services, so we need something better.

Redis Pub/Sub mechanism allows subscribe to channel, and publish message to all subscribers, all subscribes will receive data in real time.

We will make example where Service A will subscribe to channel users:* and receive all requests and will send back to channel response. Service B will requests some specific data(User).

Step 1 - registering Service A

For lounching laravel-redis-router we should run: php artisan listen:service users

That's mean that Service A will subscribe for {users} channel.

Step 2 - service controller for Service A

php artisan make:controller UserRedisController

Patter for creation: {SERVICE_NAME}RedisController For example: for notification service we must register NotificationRedisController... eg...

Step 3 - implementing first method for Service A

First that you must to know: each controller can be bound to Model(Eloqument), thats allow request data from Service B directly from DB via present model

We implemented test method, that has argument $data, there is no limits with arguments, you can declare as much as you need, also it can be in any basic type.

*Redis controller always must return Collection

Step 4 - requesting the data from Service B

Requesting controller's method

In your console you will see: Response is: {'0':"ok!", "key": "Hello World"}

Response is JSON object with your data.

Requesting data directly from DB

In your console you will see: Response is: Oleg

Response is JSON object with your data.

How it looks in Redis Monitor

1. Service A subscribes to all channel with all package IDs.
2. Service B creates package 322d3a41-c34c-46fe-aa7f-c3aff180a569 and subscibes to it's channel
3. Service B sends to package's channel request request||where||[[\"id\",\"!=\",-65535]]
4. Service A, that parsed request calls method where firstly in Controller, in if not present in bound Model, generates Collection of response.
5. Generated response Service A sends to needed channel.
6. Service B unsubscribes package's channel.

Each package should have id, and as we cannot implement numerical inctementing id we just create UUID(for ex.: 322d3a41-c34c-46fe-aa7f-c3aff180a569)

How is Protocol looks

request||where||[[\"id\",\"!=\",-65535]] this string means that received redis Pub event is actually 'Request', and within it's Controller we should call 'where' method, with arguments '[[\"id\",\"!=\",-65535]]'

Argument can be not one, for example: request||where||api_token||12345_token