mirror of https://gitlab.com/famedly/conduit
feat: Integration with persy using background ops
Tglman
3 years ago
parent
5b8d2a736e
commit
ab15ec6c32
@ -0,0 +1,245 @@
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use crate::{
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database::{
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abstraction::{DatabaseEngine, Tree},
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Config,
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},
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Result,
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};
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use persy::{ByteVec, OpenOptions, Persy, Transaction, TransactionConfig, ValueMode};
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use std::{
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collections::HashMap,
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future::Future,
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pin::Pin,
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sync::{Arc, RwLock},
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};
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use tokio::sync::oneshot::Sender;
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use tracing::warn;
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pub struct PersyEngine {
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persy: Persy,
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}
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impl DatabaseEngine for PersyEngine {
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fn open(config: &Config) -> Result<Arc<Self>> {
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let mut cfg = persy::Config::new();
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cfg.change_cache_size((config.db_cache_capacity_mb * 1024.0 * 1024.0) as u64);
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let persy = OpenOptions::new()
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.create(true)
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.config(cfg)
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.open(&format!("{}/db.persy", config.database_path))?;
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Ok(Arc::new(PersyEngine { persy }))
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}
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fn open_tree(self: &Arc<Self>, name: &'static str) -> Result<Arc<dyn Tree>> {
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// Create if it doesn't exist
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if !self.persy.exists_index(name)? {
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let mut tx = self.persy.begin()?;
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tx.create_index::<ByteVec, ByteVec>(name, ValueMode::Replace)?;
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tx.prepare()?.commit()?;
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}
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Ok(Arc::new(PersyTree {
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persy: self.persy.clone(),
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name: name.to_owned(),
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watchers: RwLock::new(HashMap::new()),
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}))
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}
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fn flush(self: &Arc<Self>) -> Result<()> {
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Ok(())
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}
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}
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pub struct PersyTree {
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persy: Persy,
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name: String,
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watchers: RwLock<HashMap<Vec<u8>, Vec<Sender<()>>>>,
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}
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impl PersyTree {
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fn begin(&self) -> Result<Transaction> {
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Ok(self
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.persy
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.begin_with(TransactionConfig::new().set_background_sync(true))?)
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}
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}
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impl Tree for PersyTree {
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#[tracing::instrument(skip(self, key))]
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fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>> {
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let result = self
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.persy
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.get::<ByteVec, ByteVec>(&self.name, &ByteVec::from(key))?
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.next()
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.map(|v| (*v).to_owned());
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Ok(result)
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}
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#[tracing::instrument(skip(self, key, value))]
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fn insert(&self, key: &[u8], value: &[u8]) -> Result<()> {
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self.insert_batch(&mut Some((key.to_owned(), value.to_owned())).into_iter())?;
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let watchers = self.watchers.read().unwrap();
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let mut triggered = Vec::new();
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for length in 0..=key.len() {
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if watchers.contains_key(&key[..length]) {
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triggered.push(&key[..length]);
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}
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}
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drop(watchers);
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if !triggered.is_empty() {
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let mut watchers = self.watchers.write().unwrap();
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for prefix in triggered {
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if let Some(txs) = watchers.remove(prefix) {
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for tx in txs {
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let _ = tx.send(());
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}
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}
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}
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}
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Ok(())
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}
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#[tracing::instrument(skip(self, iter))]
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fn insert_batch<'a>(&self, iter: &mut dyn Iterator<Item = (Vec<u8>, Vec<u8>)>) -> Result<()> {
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let mut tx = self.begin()?;
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for (key, value) in iter {
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tx.put::<ByteVec, ByteVec>(
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&self.name,
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ByteVec::from(key.clone()),
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ByteVec::from(value),
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)?;
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}
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tx.prepare()?.commit()?;
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Ok(())
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}
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#[tracing::instrument(skip(self, iter))]
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fn increment_batch<'a>(&self, iter: &mut dyn Iterator<Item = Vec<u8>>) -> Result<()> {
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let mut tx = self.begin()?;
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for key in iter {
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let old = tx
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.get::<ByteVec, ByteVec>(&self.name, &ByteVec::from(key.clone()))?
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.next()
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.map(|v| (*v).to_owned());
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let new = crate::utils::increment(old.as_deref()).unwrap();
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tx.put::<ByteVec, ByteVec>(&self.name, ByteVec::from(key), ByteVec::from(new))?;
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}
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tx.prepare()?.commit()?;
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Ok(())
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}
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#[tracing::instrument(skip(self, key))]
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fn remove(&self, key: &[u8]) -> Result<()> {
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let mut tx = self.begin()?;
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tx.remove::<ByteVec, ByteVec>(&self.name, ByteVec::from(key), None)?;
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tx.prepare()?.commit()?;
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Ok(())
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}
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#[tracing::instrument(skip(self))]
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fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = (Vec<u8>, Vec<u8>)> + 'a> {
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let iter = self.persy.range::<ByteVec, ByteVec, _>(&self.name, ..);
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match iter {
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Ok(iter) => Box::new(iter.filter_map(|(k, v)| {
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v.into_iter()
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.map(|val| ((*k).to_owned().into(), (*val).to_owned().into()))
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.next()
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})),
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Err(e) => {
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warn!("error iterating {:?}", e);
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Box::new(std::iter::empty())
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}
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}
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}
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#[tracing::instrument(skip(self, from, backwards))]
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fn iter_from<'a>(
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&'a self,
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from: &[u8],
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backwards: bool,
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) -> Box<dyn Iterator<Item = (Vec<u8>, Vec<u8>)> + 'a> {
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let range = if backwards {
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self.persy
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.range::<ByteVec, ByteVec, _>(&self.name, ..=ByteVec::from(from))
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} else {
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self.persy
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.range::<ByteVec, ByteVec, _>(&self.name, ByteVec::from(from)..)
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};
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match range {
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Ok(iter) => {
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let map = iter.filter_map(|(k, v)| {
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v.into_iter()
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.map(|val| ((*k).to_owned().into(), (*val).to_owned().into()))
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.next()
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});
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if backwards {
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Box::new(map.rev())
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} else {
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Box::new(map)
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}
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}
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Err(e) => {
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warn!("error iterating with prefix {:?}", e);
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Box::new(std::iter::empty())
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}
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}
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}
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#[tracing::instrument(skip(self, key))]
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fn increment(&self, key: &[u8]) -> Result<Vec<u8>> {
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self.increment_batch(&mut Some(key.to_owned()).into_iter())?;
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Ok(self.get(key)?.unwrap())
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}
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#[tracing::instrument(skip(self, prefix))]
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fn scan_prefix<'a>(
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&'a self,
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prefix: Vec<u8>,
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) -> Box<dyn Iterator<Item = (Vec<u8>, Vec<u8>)> + 'a> {
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let range_prefix = ByteVec::from(prefix.clone());
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let range = self
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.persy
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.range::<ByteVec, ByteVec, _>(&self.name, range_prefix..);
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match range {
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Ok(iter) => {
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let owned_prefix = prefix.clone();
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Box::new(
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iter.take_while(move |(k, _)| (*k).starts_with(&owned_prefix))
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.filter_map(|(k, v)| {
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v.into_iter()
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.map(|val| ((*k).to_owned().into(), (*val).to_owned().into()))
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.next()
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}),
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)
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}
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Err(e) => {
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warn!("error scanning prefix {:?}", e);
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Box::new(std::iter::empty())
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}
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}
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}
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#[tracing::instrument(skip(self, prefix))]
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fn watch_prefix<'a>(&'a self, prefix: &[u8]) -> Pin<Box<dyn Future<Output = ()> + Send + 'a>> {
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let (tx, rx) = tokio::sync::oneshot::channel();
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self.watchers
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.write()
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.unwrap()
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.entry(prefix.to_vec())
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.or_default()
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.push(tx);
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Box::pin(async move {
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// Tx is never destroyed
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rx.await.unwrap();
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})
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}
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}
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