Caboose

A Redis clone built in Go, because I had nothing better to do this afternoon. Named after Captain Michael J. Caboose.

How to use it?

Please don't. It's a Proof of Concept.

Run go run main.go in a terminal window, it'll spawn a (somewhat) Redis-compatible server on localhost:6900. Send commands using redis-cli, like in the screenshot:

RESP

TL;DR version of REdis Serialization Protocol.

Disclaimer:

I was lazy to read through the whole RESP specs, but I think I am implementing RESP 2.0

• RESP is a req/res protocol, with binary requests and responses (but they're ASCII-compatible)
• All req/res are terminated by CRLF (\r\n)
• The 1st byte of the req/res payload defines the data type:
  • Simple (non-binary) Strings start with +: e.g. +OK\r\n
  • Bulk strings (whatever that is) start with $: e.g. $5\r\nhowdy\r\n - That initial 5 represents the byte length of the encoded string
  • Errors start with -: e.g. -ERR bruh whachu doin\r\n
  • Integers start with :: e.g. :420 or :-69
  • Arrays start with *: each array item should be encoded with the data type as well, so:
    • String Array: *2\r\n$5\r\nhowdy\r\n$4\r\nyall\r\n\r\n (notice the initial *2, the length, followed by $5\r\nhowdy and the $4\r\nyall divided by CRLF)
    • Int array: *2\r\n:420\r\n:-69\r\n
    • Mixed data types: *2\r\n:69\r\n$4\r\nwink\r\n (I'm joking now, but I can see how parsing this will be a pain in my assholes)
  • Nulls start with _: e.g. _\r\n
  • Bools start with #
  • Doubles start with , (now you're just making things up) I decided not to bother; this is a proof of concept
  • Maps start with % (Aight, I'm not gonna implement all these now, am I?)