https://github.com/jorgemarcial/workshop-redis
workshop redis
https://github.com/jorgemarcial/workshop-redis
example redis workshop
Last synced: 8 months ago
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workshop redis
- Host: GitHub
- URL: https://github.com/jorgemarcial/workshop-redis
- Owner: jorgemarcial
- Created: 2020-06-01T09:31:41.000Z (almost 6 years ago)
- Default Branch: master
- Last Pushed: 2021-05-11T16:22:24.000Z (almost 5 years ago)
- Last Synced: 2025-03-16T16:19:29.309Z (about 1 year ago)
- Topics: example, redis, workshop
- Language: Lua
- Size: 181 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
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README
# What is redis?
* In-memory data structure store, used as a database, cache and message broker.
* Key / value database.
* Different levels of on-disk persistence.
# Why redis?
* Not just a cache.
* Multiple datatypes.
* Pub-sub model.
* Cluster mode for high availability.
* Perfectly works in cloud: AWS Elasticache, Azure Redis Cache and Memorystore (Google Cloud).
# Data types
Remember you need in our local:
```bash
# redis
# redis-cli
# npm / nodejs
# install dependencies
npm install
```
## Overview
> * Redis instance has 16 databases, DONT NEED PREFIX IN KEYS
``` bash
redis-cli -n {database_number}
```
>* Debugging from cli
```bash
redis-cli monitor
```
> * Main commands: KEYS / DEBUG / SCAN / TYPE / EXPIRATE
## String
> * Basic data type
> * Main commands: set / get
```bash
node examples/datatypes/string.js
```
## List
> * Arrays of strings
> * Main commands : lpush / lrange / lpop
```bash
node examples/datatypes/list.js
```
### Set
> * Unique and unordered collection of strings
> * Main commands: sadd / smember / srem / sscan
```bash
node examples/datatypes/set.js
```
### Hash
> * Maps between string fields and string values
> * Perfect data type to represent objects
> * Main commands: hset / hmset / hget / hgetall / hscan
```bash
node examples/datatypes/hash.js
```
### Sorted Sets
> * Similarly to Redis Sets, non repeating collections of Strings.
> * Every member of a Sorted Set is associated with score
> * Main commands: zadd / zrangebyscore
```bash
node examples/datatypes/sorted-set.js
```
### Streams
> * New data type from Redis 5
> * Goal handle large amount of data (example: chat history, logs, etc)
> * Main commands: xadd / xread
```bash
node examples/datatypes/stream.js
```
# Transactions
### COMMANDS MULTI, EXEC, DISCARD and WATCH
> * They allow the execution of a group of commands in a single step
> * All the commands in a transaction are serialized and executed sequentially.
> * Atomicity (either all occur or nothing occurs)
```bash
node examples/transactions/multi-exec.js
```
### LUA SCRIPT
> * You can encapsulate some complex operations in a script and your data layer will perform the atomic
```bash
node examples/transactions/rewards.js
node examples/transactions/lua-script.js
```
# Message Queues
* PUBLISH / SUBSCRIBE
pros
> * Memory efficiency
> * Group messagingsS
> * Examples: notifications, chats, etc.
cons
> * High chance loss message
```bash
node pubsub.js
```
* BRPOPLPUSH / RedisSMQ
> * Message only will be consumed by one consumer
> * Less memory efficiency
```bash
node examples/queues/create.js
node examples/queues/producer.js
node examples/queues/consumer.js
```
# Everyone should read
[https://redis.io/topics/introduction](https://redis.io/topics/introduction)
[https://dzone.com/articles/how-redis-is-used-in-practice](https://dzone.com/articles/how-redis-is-used-in-practice)
[https://www.bogotobogo.com/DevOps/Redis/Redis_vs_Memcached.php](https://www.bogotobogo.com/DevOps/Redis/Redis_vs_Memcached.php)
[https://matt.sh/what-is-redis](https://matt.sh/what-is-redis)
[https://matt.sh/introduction-to-redis-data-types](https://matt.sh/introduction-to-redis-data-types)
[https://www.compose.com/articles/a-quick-guide-to-redis-lua-scripting/](https://www.compose.com/articles/a-quick-guide-to-redis-lua-scripting/)
[https://medium.com/@anvannguyen/redis-message-queue-rpoplpush-vs-pub-sub-e8a19a3c071b](https://medium.com/@anvannguyen/redis-message-queue-rpoplpush-vs-pub-sub-e8a19a3c071b)