Toy Redis in Kotlin in 120 lines

java -jar kredis-1.0.0.jar [PORT]

examples:

java -jar kredis-1.0.0.jar
java -jar kredis-1.0.0.jar 3000 

nc [HOST] [PORT]

example

nc localhost 3000

java -cp kredis-1.0.0.jar main.SocketClient [HOST] [PORT]

examples

java -cp kredis-1.0.0.jar main.SocketClient 
java -cp kredis-1.0.0.jar main.SocketClient 127.0.0.1
java -cp kredis-1.0.0.jar main.SocketClient localhost 3000

node client.js [HOST] [PORT]

examples

node client.js
node client.js 127.0.0.1
node client.js localhost 3000

kredis keeps it simple with just a handful of commands. Here’s the full list:

Stores a value under a key.

Keys must not contain spaces.

Example:

set hello world
Response: OK

Retrieves the value stored under a key.

Example:

get hello
Response: world

Deletes a key and its value.

Example:

del hello
Response: OK

Increments the numeric value of a key by the specified [value]. If the [value] is not provided, it defaults to 1. If the key doesn’t exist, it starts at 0.

Examples:

Increment by 1 (default):

incr counter
Response: 1

Increment by a specific value:

incr score 10
Response: 10

Decrements the numeric value of a key by the specified [value]. If the [value] is not provided, it defaults to 1. If the key doesn’t exist, it starts at 0.

Examples:

Decrement by 1 (default):

decr counter
Response: -1

Decrement by a specific value:

decr score 2
Response: 8

Closes the session and disconnects from HippieDB. Use this when you’re done sharing the vibes.

Example:

stop
Response: (connection closes)

Refactored from this based on this blog post https://blog.pjam.me/posts/toy-redis-go/