Timo Kösters
5 years ago
47 changed files with 1447 additions and 994 deletions
@ -0,0 +1,309 @@
@@ -0,0 +1,309 @@
|
||||
use std::{ |
||||
collections::BTreeMap, |
||||
future::Future, |
||||
pin::Pin, |
||||
sync::{Arc, RwLock}, |
||||
}; |
||||
|
||||
use log::warn; |
||||
use rocksdb::{ |
||||
BoundColumnFamily, ColumnFamilyDescriptor, DBWithThreadMode, Direction, MultiThreaded, Options, |
||||
}; |
||||
|
||||
use super::Config; |
||||
use crate::{utils, Result}; |
||||
|
||||
pub struct SledEngine(sled::Db); |
||||
pub struct SledEngineTree(sled::Tree); |
||||
pub struct RocksDbEngine(rocksdb::DBWithThreadMode<MultiThreaded>); |
||||
pub struct RocksDbEngineTree<'a> { |
||||
db: Arc<RocksDbEngine>, |
||||
name: &'a str, |
||||
watchers: RwLock<BTreeMap<Vec<u8>, Vec<tokio::sync::oneshot::Sender<()>>>>, |
||||
} |
||||
|
||||
pub trait DatabaseEngine: Sized { |
||||
fn open(config: &Config) -> Result<Arc<Self>>; |
||||
fn open_tree(self: &Arc<Self>, name: &'static str) -> Result<Arc<dyn Tree>>; |
||||
} |
||||
|
||||
pub trait Tree: Send + Sync { |
||||
fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>>; |
||||
|
||||
fn insert(&self, key: &[u8], value: &[u8]) -> Result<()>; |
||||
|
||||
fn remove(&self, key: &[u8]) -> Result<()>; |
||||
|
||||
fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + Send + Sync + 'a>; |
||||
|
||||
fn iter_from<'a>( |
||||
&'a self, |
||||
from: &[u8], |
||||
backwards: bool, |
||||
) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + 'a>; |
||||
|
||||
fn increment(&self, key: &[u8]) -> Result<Vec<u8>>; |
||||
|
||||
fn scan_prefix<'a>( |
||||
&'a self, |
||||
prefix: Vec<u8>, |
||||
) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + 'a>; |
||||
|
||||
fn watch_prefix<'a>(&'a self, prefix: &[u8]) -> Pin<Box<dyn Future<Output = ()> + Send + 'a>>; |
||||
|
||||
fn clear(&self) -> Result<()> { |
||||
for (key, _) in self.iter() { |
||||
self.remove(&key)?; |
||||
} |
||||
|
||||
Ok(()) |
||||
} |
||||
} |
||||
|
||||
impl DatabaseEngine for SledEngine { |
||||
fn open(config: &Config) -> Result<Arc<Self>> { |
||||
Ok(Arc::new(SledEngine( |
||||
sled::Config::default() |
||||
.path(&config.database_path) |
||||
.cache_capacity(config.cache_capacity as u64) |
||||
.use_compression(true) |
||||
.open()?, |
||||
))) |
||||
} |
||||
|
||||
fn open_tree(self: &Arc<Self>, name: &'static str) -> Result<Arc<dyn Tree>> { |
||||
Ok(Arc::new(SledEngineTree(self.0.open_tree(name)?))) |
||||
} |
||||
} |
||||
|
||||
impl Tree for SledEngineTree { |
||||
fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>> { |
||||
Ok(self.0.get(key)?.map(|v| v.to_vec())) |
||||
} |
||||
|
||||
fn insert(&self, key: &[u8], value: &[u8]) -> Result<()> { |
||||
self.0.insert(key, value)?; |
||||
Ok(()) |
||||
} |
||||
|
||||
fn remove(&self, key: &[u8]) -> Result<()> { |
||||
self.0.remove(key)?; |
||||
Ok(()) |
||||
} |
||||
|
||||
fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + Send + Sync + 'a> { |
||||
Box::new( |
||||
self.0 |
||||
.iter() |
||||
.filter_map(|r| { |
||||
if let Err(e) = &r { |
||||
warn!("Error: {}", e); |
||||
} |
||||
r.ok() |
||||
}) |
||||
.map(|(k, v)| (k.to_vec().into(), v.to_vec().into())), |
||||
) |
||||
} |
||||
|
||||
fn iter_from( |
||||
&self, |
||||
from: &[u8], |
||||
backwards: bool, |
||||
) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)>> { |
||||
let iter = if backwards { |
||||
self.0.range(..from) |
||||
} else { |
||||
self.0.range(from..) |
||||
}; |
||||
|
||||
let iter = iter |
||||
.filter_map(|r| { |
||||
if let Err(e) = &r { |
||||
warn!("Error: {}", e); |
||||
} |
||||
r.ok() |
||||
}) |
||||
.map(|(k, v)| (k.to_vec().into(), v.to_vec().into())); |
||||
|
||||
if backwards { |
||||
Box::new(iter.rev()) |
||||
} else { |
||||
Box::new(iter) |
||||
} |
||||
} |
||||
|
||||
fn increment(&self, key: &[u8]) -> Result<Vec<u8>> { |
||||
Ok(self |
||||
.0 |
||||
.update_and_fetch(key, utils::increment) |
||||
.map(|o| o.expect("increment always sets a value").to_vec())?) |
||||
} |
||||
|
||||
fn scan_prefix<'a>( |
||||
&'a self, |
||||
prefix: Vec<u8>, |
||||
) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + 'a> { |
||||
let iter = self |
||||
.0 |
||||
.scan_prefix(prefix) |
||||
.filter_map(|r| { |
||||
if let Err(e) = &r { |
||||
warn!("Error: {}", e); |
||||
} |
||||
r.ok() |
||||
}) |
||||
.map(|(k, v)| (k.to_vec().into(), v.to_vec().into())); |
||||
|
||||
Box::new(iter) |
||||
} |
||||
|
||||
fn watch_prefix<'a>(&'a self, prefix: &[u8]) -> Pin<Box<dyn Future<Output = ()> + Send + 'a>> { |
||||
let prefix = prefix.to_vec(); |
||||
Box::pin(async move { |
||||
self.0.watch_prefix(prefix).await; |
||||
}) |
||||
} |
||||
} |
||||
|
||||
impl DatabaseEngine for RocksDbEngine { |
||||
fn open(config: &Config) -> Result<Arc<Self>> { |
||||
let mut db_opts = Options::default(); |
||||
db_opts.create_if_missing(true); |
||||
|
||||
let cfs = DBWithThreadMode::<MultiThreaded>::list_cf(&db_opts, &config.database_path) |
||||
.unwrap_or_default(); |
||||
|
||||
let mut options = Options::default(); |
||||
options.set_merge_operator_associative("increment", utils::increment_rocksdb); |
||||
|
||||
let db = DBWithThreadMode::<MultiThreaded>::open_cf_descriptors( |
||||
&db_opts, |
||||
&config.database_path, |
||||
cfs.iter() |
||||
.map(|name| ColumnFamilyDescriptor::new(name, options.clone())), |
||||
)?; |
||||
|
||||
Ok(Arc::new(RocksDbEngine(db))) |
||||
} |
||||
|
||||
fn open_tree(self: &Arc<Self>, name: &'static str) -> Result<Arc<dyn Tree>> { |
||||
let mut options = Options::default(); |
||||
options.set_merge_operator_associative("increment", utils::increment_rocksdb); |
||||
|
||||
// Create if it doesn't exist
|
||||
let _ = self.0.create_cf(name, &options); |
||||
|
||||
Ok(Arc::new(RocksDbEngineTree { |
||||
name, |
||||
db: Arc::clone(self), |
||||
watchers: RwLock::new(BTreeMap::new()), |
||||
})) |
||||
} |
||||
} |
||||
|
||||
impl RocksDbEngineTree<'_> { |
||||
fn cf(&self) -> BoundColumnFamily<'_> { |
||||
self.db.0.cf_handle(self.name).unwrap() |
||||
} |
||||
} |
||||
|
||||
impl Tree for RocksDbEngineTree<'_> { |
||||
fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>> { |
||||
Ok(self.db.0.get_cf(self.cf(), key)?) |
||||
} |
||||
|
||||
fn insert(&self, key: &[u8], value: &[u8]) -> Result<()> { |
||||
let watchers = self.watchers.read().unwrap(); |
||||
let mut triggered = Vec::new(); |
||||
|
||||
for length in 0..=key.len() { |
||||
if watchers.contains_key(&key[..length]) { |
||||
triggered.push(&key[..length]); |
||||
} |
||||
} |
||||
|
||||
drop(watchers); |
||||
|
||||
if !triggered.is_empty() { |
||||
let mut watchers = self.watchers.write().unwrap(); |
||||
for prefix in triggered { |
||||
if let Some(txs) = watchers.remove(prefix) { |
||||
for tx in txs { |
||||
let _ = tx.send(()); |
||||
} |
||||
} |
||||
} |
||||
} |
||||
|
||||
Ok(self.db.0.put_cf(self.cf(), key, value)?) |
||||
} |
||||
|
||||
fn remove(&self, key: &[u8]) -> Result<()> { |
||||
Ok(self.db.0.delete_cf(self.cf(), key)?) |
||||
} |
||||
|
||||
fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + Send + Sync + 'a> { |
||||
Box::new( |
||||
self.db |
||||
.0 |
||||
.iterator_cf(self.cf(), rocksdb::IteratorMode::Start), |
||||
) |
||||
} |
||||
|
||||
fn iter_from<'a>( |
||||
&'a self, |
||||
from: &[u8], |
||||
backwards: bool, |
||||
) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + 'a> { |
||||
Box::new(self.db.0.iterator_cf( |
||||
self.cf(), |
||||
rocksdb::IteratorMode::From( |
||||
from, |
||||
if backwards { |
||||
Direction::Reverse |
||||
} else { |
||||
Direction::Forward |
||||
}, |
||||
), |
||||
)) |
||||
} |
||||
|
||||
fn increment(&self, key: &[u8]) -> Result<Vec<u8>> { |
||||
// TODO: atomic?
|
||||
let old = self.get(key)?; |
||||
let new = utils::increment(old.as_deref()).unwrap(); |
||||
self.insert(key, &new)?; |
||||
Ok(new) |
||||
} |
||||
|
||||
fn scan_prefix<'a>( |
||||
&'a self, |
||||
prefix: Vec<u8>, |
||||
) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + 'a> { |
||||
Box::new( |
||||
self.db |
||||
.0 |
||||
.iterator_cf( |
||||
self.cf(), |
||||
rocksdb::IteratorMode::From(&prefix, Direction::Forward), |
||||
) |
||||
.take_while(move |(k, _)| k.starts_with(&prefix)), |
||||
) |
||||
} |
||||
|
||||
fn watch_prefix<'a>(&'a self, prefix: &[u8]) -> Pin<Box<dyn Future<Output = ()> + Send + 'a>> { |
||||
let (tx, rx) = tokio::sync::oneshot::channel(); |
||||
|
||||
self.watchers |
||||
.write() |
||||
.unwrap() |
||||
.entry(prefix.to_vec()) |
||||
.or_default() |
||||
.push(tx); |
||||
|
||||
Box::pin(async move { |
||||
// Tx is never destroyed
|
||||
rx.await.unwrap(); |
||||
}) |
||||
} |
||||
} |
||||
Loading…
Reference in new issue