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snkrj: move database struct to its own crate
This commit is contained in:
nym21
@@ -1,6 +1,6 @@
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MIT License
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Copyright (c) 2024 Biter
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Copyright (c) 2024 biter
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||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
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|
||||
Generated
+242
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"sanakirja",
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@@ -0,0 +1,12 @@
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[package]
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name = "snkrj"
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description = "A simple wrapper around Sanakirja aatabase that acts as a very fast on disk BTreeMap"
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version = "0.1.0"
|
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license = "MIT"
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repository = "https://github.com/kibo-money/kibo/tree/main/crates/snkrj"
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keywords = ["database", "sanakirja", "btreemap"]
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categories = ["database"]
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edition = "2021"
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[dependencies]
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sanakirja = "1.4.3"
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@@ -0,0 +1,21 @@
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MIT License
|
||||
|
||||
Copyright (c) 2024 snkrj
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in all
|
||||
copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
SOFTWARE.
|
||||
@@ -0,0 +1,37 @@
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# snkrj
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A simple wrapper around Sanakirja aatabase that acts as a very fast on disk BTreeMap.
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## Example
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```rust
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use snkrj::{AnyDatabase, Database};
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fn main() {
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let path = std::env::temp_dir().join("./db");
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let database: Database<i32, i32> = Database::open(path.clone()).unwrap();
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let _ = database.destroy();
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let mut database: Database<i32, i32> = Database::open(path.clone()).unwrap();
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database.insert(64, 128);
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database.export(false).unwrap();
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let mut database: Database<i32, i32> = Database::open(path).unwrap();
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database.insert(1, 2);
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database.insert(128, 256);
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println!("iter_ram:");
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database.iter_ram().for_each(|pair| {
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println!("{:?}", pair);
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});
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println!("iter_disk:");
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database.iter_disk().for_each(|pair| {
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println!("{:?}", pair.unwrap());
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});
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println!("iter_ram_then_disk:");
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database.iter_ram_then_disk().for_each(|pair| {
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println!("{:?}", pair);
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});
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database.export(false).unwrap();
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}
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```
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@@ -0,0 +1,252 @@
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// https://docs.rs/sanakirja/latest/sanakirja/index.html
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// https://pijul.org/posts/2021-02-06-rethinking-sanakirja/
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|
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use std::{
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collections::{BTreeMap, BTreeSet},
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fmt::Debug,
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fs, io, mem,
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path::PathBuf,
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result::Result,
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};
|
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|
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use sanakirja::btree::{page, Db_};
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pub use sanakirja::*;
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///
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/// A simple wrapper around Sanakirja aatabase that acts as a very fast on disk BTreeMap.
|
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///
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/// The state of the tree is uncommited until `.export()` is called during which it is unsafe to stop the program.
|
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///
|
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pub struct Database<Key, Value>
|
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where
|
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Key: Ord + Clone + Debug + Storable,
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Value: Storable + PartialEq,
|
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{
|
||||
path: PathBuf,
|
||||
puts: BTreeMap<Key, Value>,
|
||||
dels: BTreeSet<Key>,
|
||||
db: Db_<Key, Value, page::Page<Key, Value>>,
|
||||
txn: MutTxn<Env, ()>,
|
||||
}
|
||||
|
||||
const ROOT_DB: usize = 0;
|
||||
const PAGE_SIZE: u64 = 4096;
|
||||
|
||||
impl<Key, Value> Database<Key, Value>
|
||||
where
|
||||
Key: Ord + Clone + Debug + Storable,
|
||||
Value: Storable + PartialEq,
|
||||
{
|
||||
/// Open a database without a lock file where only one instance is safe to open.
|
||||
pub fn open(path: PathBuf) -> Result<Self, Error> {
|
||||
let env = unsafe { Env::new_nolock(&path, PAGE_SIZE, 1)? };
|
||||
|
||||
let mut txn = Env::mut_txn_begin(env)?;
|
||||
|
||||
let db = txn
|
||||
.root_db(ROOT_DB)
|
||||
.unwrap_or_else(|| unsafe { btree::create_db_(&mut txn).unwrap() });
|
||||
|
||||
Ok(Self {
|
||||
path,
|
||||
puts: BTreeMap::default(),
|
||||
dels: BTreeSet::default(),
|
||||
db,
|
||||
txn,
|
||||
})
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn get(&self, key: &Key) -> Option<&Value> {
|
||||
if let Some(cached_put) = self.get_from_ram(key) {
|
||||
return Some(cached_put);
|
||||
}
|
||||
|
||||
self.get_from_disk(key)
|
||||
}
|
||||
|
||||
/// Get only from the uncommited tree (ram) without checking the database (disk)
|
||||
#[inline]
|
||||
pub fn get_from_ram(&self, key: &Key) -> Option<&Value> {
|
||||
self.puts.get(key)
|
||||
}
|
||||
|
||||
/// Get mut only from the uncommited tree (ram) without checking the database (disk)
|
||||
#[inline]
|
||||
pub fn get_mut_from_ram(&mut self, key: &Key) -> Option<&mut Value> {
|
||||
self.puts.get_mut(key)
|
||||
}
|
||||
|
||||
/// Get only from the database (disk) without checking the uncommited tree (ram)
|
||||
#[inline]
|
||||
pub fn get_from_disk(&self, key: &Key) -> Option<&Value> {
|
||||
let option = btree::get(&self.txn, &self.db, key, None).unwrap();
|
||||
|
||||
if let Some((key_found, v)) = option {
|
||||
if key == key_found {
|
||||
return Some(v);
|
||||
}
|
||||
}
|
||||
|
||||
None
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn insert(&mut self, key: Key, value: Value) -> Option<Value> {
|
||||
self.dels.remove(&key);
|
||||
self.insert_to_ram(key, value)
|
||||
}
|
||||
|
||||
/// Insert without removing the key to the dels tree, so be sure that it hasn't added to the delete set
|
||||
#[inline]
|
||||
pub fn insert_to_ram(&mut self, key: Key, value: Value) -> Option<Value> {
|
||||
self.puts.insert(key, value)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn update(&mut self, key: Key, value: Value) -> Option<Value> {
|
||||
self.dels.insert(key.clone());
|
||||
self.puts.insert(key, value)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn remove(&mut self, key: &Key) -> Option<Value> {
|
||||
self.remove_from_ram(key).or_else(|| {
|
||||
self.remove_later_from_disk(key);
|
||||
|
||||
None
|
||||
})
|
||||
}
|
||||
|
||||
/// Get only from the uncommited tree (ram) without checking the database (disk)
|
||||
#[inline]
|
||||
pub fn remove_from_ram(&mut self, key: &Key) -> Option<Value> {
|
||||
self.puts.remove(key)
|
||||
}
|
||||
|
||||
/// Add the key only to the dels tree without checking if it's present in the puts tree, only use if you are positive that you neither added nor updated an entry with this key
|
||||
#[inline]
|
||||
pub fn remove_later_from_disk(&mut self, key: &Key) {
|
||||
self.dels.insert(key.clone());
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn is_empty(&self) -> bool {
|
||||
self.iter_disk().next().is_none()
|
||||
}
|
||||
|
||||
/// Iterate over key/value pairs from the uncommited tree (ram)
|
||||
#[inline]
|
||||
pub fn iter_ram(&self) -> std::collections::btree_map::Iter<'_, Key, Value> {
|
||||
self.puts.iter()
|
||||
}
|
||||
|
||||
/// Iterate over key/value pairs from the database (disk)
|
||||
#[inline]
|
||||
pub fn iter_disk(
|
||||
&self,
|
||||
) -> btree::Iter<'_, MutTxn<Env, ()>, Key, Value, page::Page<Key, Value>> {
|
||||
btree::iter(&self.txn, &self.db, None).unwrap()
|
||||
}
|
||||
|
||||
/// Iterate over key/value pairs
|
||||
#[inline]
|
||||
pub fn iter_ram_then_disk(&self) -> impl Iterator<Item = (&Key, &Value)> {
|
||||
self.iter_ram().chain(self.iter_disk().map(|r| r.unwrap()))
|
||||
}
|
||||
|
||||
/// Collect a **clone** of all uncommited key/value pairs (ram)
|
||||
pub fn collect_ram(&self) -> BTreeMap<Key, Value>
|
||||
where
|
||||
Value: Clone,
|
||||
{
|
||||
self.puts.clone()
|
||||
}
|
||||
|
||||
/// Collect a **clone** of all key/value pairs from the database (disk)
|
||||
pub fn collect_disk(&self) -> BTreeMap<Key, Value>
|
||||
where
|
||||
Value: Clone,
|
||||
{
|
||||
self.iter_disk()
|
||||
.map(|r| r.unwrap())
|
||||
.map(|(key, value)| (key.clone(), value.clone()))
|
||||
.collect::<_>()
|
||||
}
|
||||
}
|
||||
|
||||
pub trait AnyDatabase {
|
||||
#[allow(unused)]
|
||||
fn export(self, defragment: bool) -> Result<(), Error>;
|
||||
fn boxed_export(self: Box<Self>, defragment: bool) -> Result<(), Error>;
|
||||
#[allow(unused)]
|
||||
fn destroy(self) -> io::Result<()>;
|
||||
}
|
||||
|
||||
impl<Key, Value> AnyDatabase for Database<Key, Value>
|
||||
where
|
||||
Key: Ord + Clone + Debug + Storable,
|
||||
Value: Storable + PartialEq + Clone,
|
||||
{
|
||||
/// Flush all puts and dels from the ram to disk with an option to defragment the database to save some disk space
|
||||
///
|
||||
/// /!\ Do not kill the program while this function is runnning /!\
|
||||
fn export(self, defragment: bool) -> Result<(), Error> {
|
||||
Box::new(self).boxed_export(defragment)
|
||||
}
|
||||
|
||||
/// Flush all puts and dels from the ram to disk with an option to defragment the database to save some disk space
|
||||
///
|
||||
/// /!\ Do not kill the program while this function is runnning /!\
|
||||
fn boxed_export(mut self: Box<Self>, defragment: bool) -> Result<(), Error> {
|
||||
if defragment {
|
||||
let mut btree = self.as_ref().collect_disk();
|
||||
|
||||
let path = self.path.to_owned();
|
||||
self.dels.iter().for_each(|key| {
|
||||
btree.remove(key);
|
||||
});
|
||||
btree.append(&mut self.puts);
|
||||
|
||||
self.destroy()?;
|
||||
|
||||
*self = Self::open(path).unwrap();
|
||||
|
||||
if !self.is_empty() {
|
||||
panic!()
|
||||
}
|
||||
|
||||
self.puts = btree;
|
||||
}
|
||||
|
||||
if self.dels.is_empty() && self.puts.is_empty() {
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
mem::take(&mut self.dels)
|
||||
.into_iter()
|
||||
.try_for_each(|key| -> Result<(), Error> {
|
||||
btree::del(&mut self.txn, &mut self.db, &key, None)?;
|
||||
Ok(())
|
||||
})?;
|
||||
|
||||
mem::take(&mut self.puts).into_iter().try_for_each(
|
||||
|(key, value)| -> Result<(), Error> {
|
||||
btree::put(&mut self.txn, &mut self.db, &key, &value)?;
|
||||
Ok(())
|
||||
},
|
||||
)?;
|
||||
|
||||
self.txn.set_root(ROOT_DB, self.db.db.into());
|
||||
|
||||
self.txn.commit()
|
||||
}
|
||||
|
||||
fn destroy(self) -> io::Result<()> {
|
||||
let path = self.path.to_owned();
|
||||
|
||||
drop(self);
|
||||
|
||||
fs::remove_file(&path)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,29 @@
|
||||
use snkrj::{AnyDatabase, Database};
|
||||
|
||||
fn main() {
|
||||
let path = std::env::temp_dir().join("./db");
|
||||
|
||||
let database: Database<i32, i32> = Database::open(path.clone()).unwrap();
|
||||
let _ = database.destroy();
|
||||
|
||||
let mut database: Database<i32, i32> = Database::open(path.clone()).unwrap();
|
||||
database.insert(64, 128);
|
||||
database.export(false).unwrap();
|
||||
|
||||
let mut database: Database<i32, i32> = Database::open(path).unwrap();
|
||||
database.insert(1, 2);
|
||||
database.insert(128, 256);
|
||||
println!("iter_ram:");
|
||||
database.iter_ram().for_each(|pair| {
|
||||
println!("{:?}", pair);
|
||||
});
|
||||
println!("iter_disk:");
|
||||
database.iter_disk().for_each(|pair| {
|
||||
println!("{:?}", pair.unwrap());
|
||||
});
|
||||
println!("iter_ram_then_disk:");
|
||||
database.iter_ram_then_disk().for_each(|pair| {
|
||||
println!("{:?}", pair);
|
||||
});
|
||||
database.export(false).unwrap();
|
||||
}
|
||||
Reference in New Issue
Block a user