This is an in-memory key value database similar to Redis (but a bit more basic). The program works by creating a tcp server on localhost:3332 that can then be connected to by a client.

• Commands are entered in the format verb key value
• Error responses are preceded by a "-" Ex: "-ERR key already exists\r\n"
• Non-error responses are preceded by a "+" Ex: "+OK\r\n"
• All responses are terminated with "\r\n" Ex: "+OK\r\n"

Adds a new entry to the database.

> SET user1 Aden
> +OK
> SET user1 Eilers
> -ERR key already exists

Retrives the value associeated with the given key.

> GET user1
> +Aden
> GET user2
> -ERR key does not exist

Retrieves all keys and values in the database.

> GETALL
> +user1
> Aden
> user2
> Mike
> GETALL
> -ERR no entries in database

Changes the value associated with the given key.

> UPDATE user1
> +OK
> UPDATE user2
> -ERR key does not exist

Deletes the entry associated with the given key.

> DELETE user1
> +OK
> DELETE user2
> -ERR key does not exist

Retrieves the total number of entries in the database.

> LEN
> +5
> LEN
> +0

Retrieves all values in the database.

> GETVALUES
> +Aden
> Eilers
> Mike
> GETVALUES
> -ERR no entries in database

Retrieves all keys in the database.

> GETKEYS
> +user1
> user2
> user3
> GETKEYS
> -ERR no entries in database

Checks if the given key exists in the database. 1 means 'yes', 0 means 'no'.

> EXISTS user1
> +1
> EXISTS user2
> +0

Pings the database to check if the client is still connected.

> PING
> +PONG