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//! This crate defines the distributed state management system for
//! Notive. The state is an operation-based CRDT, which given the same
//! set of operations on any client, will realize the same state.
use thiserror::Error;
use uuid::Uuid;
use crate::{
doc::{ApplyOpError, Doc},
op::{Op, OpKind},
vector_clock::VectorClock,
};
mod doc;
mod op;
mod vector_clock;
#[derive(Error, Debug)]
pub enum Error {
#[error("error while realizing state")]
RealizeError(#[from] ApplyOpError),
}
#[derive(Default)]
pub struct State {
ops: Vec<Op>,
}
impl State {
pub fn append_op(&mut self, actor_id: &Uuid, kind: OpKind) {
let clock = self
.ops
.last()
.map(|op| op.clock.inc(actor_id))
.unwrap_or_else(|| VectorClock::new().inc(actor_id));
self.ops.push(Op {
id: Uuid::now_v7(),
clock,
kind,
});
}
pub fn realize(&self) -> Result<Doc, Error> {
let mut doc = Doc::default();
for op in &self.ops {
doc.apply_op(op)?;
}
Ok(doc)
}
}
#[cfg(test)]
mod tests {
use crate::op::CreateGrid;
use super::*;
#[test]
fn test() {
let alice = Uuid::now_v7();
let mut state = State::default();
state.append_op(
&alice,
OpKind::CreateGrid(CreateGrid {
rows: 4,
base_cells_per_row: 16,
}),
);
let doc = state.realize().unwrap();
let grid = doc.grids.first().unwrap();
assert_eq!(grid.rows.len(), 4);
}
}
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