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use std::{collections::HashSet, mem::size_of};
use crate::{
database::KeyValueDatabase,
service::{self, rooms::state_compressor::data::StateDiff},
utils, Error, Result,
};
impl service::rooms::state_compressor::Data for KeyValueDatabase {
fn get_statediff(&self, shortstatehash: u64) -> Result<StateDiff> {
let value = self
.shortstatehash_statediff
.get(&shortstatehash.to_be_bytes())?
.ok_or_else(|| Error::bad_database("State hash does not exist"))?;
let parent =
utils::u64_from_bytes(&value[0..size_of::<u64>()]).expect("bytes have right length");
let parent = if parent != 0 { Some(parent) } else { None };
let mut add_mode = true;
let mut added = HashSet::new();
let mut removed = HashSet::new();
let mut i = size_of::<u64>();
while let Some(v) = value.get(i..i + 2 * size_of::<u64>()) {
if add_mode && v.starts_with(&0_u64.to_be_bytes()) {
add_mode = false;
i += size_of::<u64>();
continue;
}
if add_mode {
added.insert(v.try_into().expect("we checked the size above"));
} else {
removed.insert(v.try_into().expect("we checked the size above"));
}
i += 2 * size_of::<u64>();
}
Ok(StateDiff {
parent,
added,
removed,
})
}
fn save_statediff(&self, shortstatehash: u64, diff: StateDiff) -> Result<()> {
let mut value = diff.parent.unwrap_or(0).to_be_bytes().to_vec();
for new in &diff.added {
value.extend_from_slice(&new[..]);
}
if !diff.removed.is_empty() {
value.extend_from_slice(&0_u64.to_be_bytes());
for removed in &diff.removed {
value.extend_from_slice(&removed[..]);
}
}
self.shortstatehash_statediff
.insert(&shortstatehash.to_be_bytes(), &value)
}
}
|
