Redis-Inspired In-Memory Database in Golang

A lightweight, Redis-inspired in-memory key-value database implemented in Golang, featuring:

• Ultra-fast in-memory storage
  RESP (Redis Serialization Protocol) support
  AOF (Append-Only File) persistence
  Custom command handling
  Educational insight into Redis internals

This project highlights how modern in-memory databases work at their core and serves as a practical deep dive into networking, protocols, persistence, and storage engines.

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Features

In-Memory Storage Engine

All data is stored inside memory for extremely fast reads/writes.
Inspired by Redis’ architecture: minimal latency and straightforward data access.

RESP Protocol Implementation

The server implements RESP, the same protocol used by Redis.

This means:

• Structured command parsing
• Consistent response format
• Compatible with many Redis client behaviors
• Easy debugging & learning experience

RESP supports arrays, bulk strings, integers, errors, and simple strings — all handled in your server’s parser.

AOF Persistence (Append-Only File)

Instead of snapshotting (like Redis RDB), this project uses AOF persistence:

• Every write command (SET, DEL, etc.) is appended to a log file
• On restart, the database replays the file to rebuild the dataset
• Ensures durability while keeping the architecture simple and transparent

AOF makes it easy to understand how Redis ensures crash recovery.

Supported Commands

Command	Description
PING	Check server liveness
SET key value	Store a key-value pair
GET key	Retrieve the value of a key
HSET key	Sets a key-value pair but in a HashMap inside a HashMap
HGET key	Retrives the value of the key stored by HSET key.
HGETALL key	To Retreive all the values stored by a key by HSET.

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Architecture Overview

            ┌─────────────────────────┐
            │       Redis Client      │
            │  (RESP-Compatible Tool) │
            └───────────────▲─────────┘
                            │ RESP
                            │
                 ┌─────────┴──────────┐
                 │   Go Server Core   │
                 │ (Listener + Parser)|
                 └─────────▲──────────┘
                           │
                ┌──────────┴───────────┐
                │  In-Memory Data Store│
                └──────────▲───────────┘
                           │
                 ┌─────────┴──────────┐
                 │    AOF Persistence │
                 │ (Append & Replay)  │
                 └────────────────────┘

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Getting Started

Clone the Repository

git clone https://github.com/AryanParashar24/Redis-inspired-InMemoryDatabase-in-Golang.git
cd Redis-inspired-InMemoryDatabase-in-Golang

Run the Server

go run main.go

Connect using redis-cli (optional)

redis-cli -p <PORT>

Try:

PING
SET hello world
GET hello
DEL hello

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