Alright — I’ll prepare a technical README for your current Redis clone, strictly covering the features you’ve already implemented and detailing compilation, usage, and test cases.

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README.md

# Minimal Redis Clone (C++17)

A lightweight Redis-like key-value store implemented in C++17 with a custom RESP protocol parser, supporting a subset of Redis commands.  
This project demonstrates TCP networking, concurrent client handling, and basic in-memory database management.

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## Features Implemented

- **RESP Protocol Parsing** – Supports standard Redis serialization protocol for client communication.
- **Supported Commands**:
  - `PING` → Health check (`+PONG`)
  - `ECHO <message>` → Returns message
  - `SET <key> <value>` → Store string value
  - `GET <key>` → Retrieve string value
  - `DEL <key>` → Delete key
  - `INCR <key>` → Increment integer value (creates if absent)
  - `LPUSH <key> <value>` → Push value to start of list
  - `LPOP <key>` → Pop value from start of list
- **Multi-client Support** – Uses `std::thread` for concurrent client connections.
- **Graceful Error Handling** – RESP-compliant error messages for unknown commands.

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## Directory Structure

. ├── include │ ├── Database.h │ ├── RedisCommandHandler.h │ └── RedisServer.h ├── src │ ├── Database.cpp │ ├── RedisCommandHandler.cpp │ ├── RedisServer.cpp │ └── main.cpp └── README.md

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## Compilation

Ensure you have **g++ (C++17)** installed.  
Run:

```bash
g++ -std=c++17 -pthread -Iinclude src/*.cpp -o redis_server

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Running the Server

./redis_server

The server starts on the configured port (default: 6379). It listens for TCP client connections using the Redis protocol.

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Connecting to the Server

You can use the official redis-cli or netcat (nc) for testing.

Using redis-cli:

redis-cli -p 6379

Using nc (Netcat):

nc 127.0.0.1 6379

Commands must be sent in RESP format or as plain text for testing.

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Example Test Cases

PING

PING

Response:

+PONG

ECHO

ECHO HelloWorld

Response:

$10
HelloWorld

SET / GET

SET name Sarvesh
GET name

Response:

+OK
$7
Sarvesh

DEL

DEL name

Response:

:1

INCR

SET counter 10
INCR counter

Response:

:11

LPUSH / LPOP

LPUSH mylist first
LPUSH mylist second
LPOP mylist

Response:

:1
:2
$6
second

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Limitations

• No key expiry (EXPIRE) yet.
• No persistence to disk.
• No advanced data structures beyond strings and lists.
• No authentication (AUTH) implemented.

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Notes

• This server accepts both RESP and plain text commands for convenience.
• Multi-client support is available but not yet optimized for high concurrency.
• All data is stored in-memory only.

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Author

Sarvesh Patil – Minimal Redis server implementation in C++17.

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If you want, I can also add a **section in the README on RESP command format** so even raw TCP testers can interact without `redis-cli`.  
That way it’s fully self-contained for testing.  

Do you want me to add that section?