surrealdb-core 3.2.2

A scalable, distributed, collaborative, document-graph database, for the realtime web
Documentation 
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//! Stores a LIVE SELECT query definition on the cluster
use anyhow::Result;
use storekey::{BorrowDecode, Encode};
use uuid::Uuid;

use crate::catalog::NodeLiveQuery;
use crate::key::category::{Categorise, Category};
use crate::kvs::{KVKey, impl_kv_key_storekey};

/// The Lq key is used to quickly discover which live queries belong to which
/// nodes This is used in networking for clustered environments such as
/// discovering if an event is remote or local as well as garbage collection
/// after dead nodes
///
/// The value is just the table of the live query as a String, which is the
/// missing information from the key path
#[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Encode, BorrowDecode)]
pub(crate) struct Lq {
	__: u8,
	_a: u8,
	pub nd: Uuid,
	_b: u8,
	_c: u8,
	_d: u8,
	pub lq: Uuid,
}

impl_kv_key_storekey!(Lq => NodeLiveQuery);

pub fn new(nd: Uuid, lq: Uuid) -> Lq {
	Lq::new(nd, lq)
}

pub fn prefix(nd: Uuid) -> Result<Vec<u8>> {
	let mut k = super::all::new(nd).encode_key()?;
	k.extend_from_slice(b"!lq\x00");
	Ok(k)
}

pub fn suffix(nd: Uuid) -> Result<Vec<u8>> {
	let mut k = super::all::new(nd).encode_key()?;
	k.extend_from_slice(b"!lq\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x00");
	Ok(k)
}

impl Categorise for Lq {
	fn categorise(&self) -> Category {
		Category::NodeLiveQuery
	}
}

impl Lq {
	pub fn new(nd: Uuid, lq: Uuid) -> Self {
		Self {
			__: b'/',
			_a: b'$',
			nd,
			_b: b'!',
			_c: b'l',
			_d: b'q',
			lq,
		}
	}

	pub fn decode_key(k: &[u8]) -> anyhow::Result<Self> {
		Ok(storekey::decode_borrow(k)?)
	}
}

#[cfg(test)]
mod tests {
	use super::*;

	#[test]
	fn key() {
		let nd = Uuid::from_bytes([
			0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
			0x0f, 0x10,
		]);

		let lq = Uuid::from_bytes([
			0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e,
			0x1f, 0x20,
		]);
		let val = Lq::new(nd, lq);
		let enc = Lq::encode_key(&val).unwrap();
		assert_eq!(
			enc,
			b"/$\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\
			!lq\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20"
		);
	}

	#[test]
	fn test_prefix() {
		let nd = Uuid::from_bytes([
			0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
			0x0f, 0x10,
		]);
		let val = super::prefix(nd).unwrap();
		assert_eq!(
			val,
			b"/$\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\
			!lq\x00"
		);
	}

	#[test]
	fn test_suffix() {
		let nd = Uuid::from_bytes([
			0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
			0x0f, 0x10,
		]);
		let val = super::suffix(nd).unwrap();
		assert_eq!(
			val,
			b"/$\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\
			!lq\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x00"
		);
	}
}