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pub mod batch;
pub mod iterator;
use std::{
collections::HashMap,
io,
sync::atomic::{AtomicBool, Ordering},
sync::Arc,
};
use crate::subnet::rpc::errors::Error;
use super::{batch::BoxedBatch, iterator::BoxedIterator, BoxedDatabase};
use tokio::sync::RwLock;
#[derive(Clone)]
pub struct Database {
state: Arc<RwLock<HashMap<Vec<u8>, Vec<u8>>>>,
closed: Arc<AtomicBool>,
}
impl Database {
pub fn new() -> BoxedDatabase {
Box::new(Self {
state: Arc::new(RwLock::new(HashMap::new())),
closed: Arc::new(AtomicBool::new(false)),
})
}
}
#[tonic::async_trait]
impl super::KeyValueReaderWriterDeleter for Database {
async fn has(&self, key: &[u8]) -> io::Result<bool> {
let db = self.state.read().await;
match db.get(&key.to_vec()) {
Some(_) => Ok(true),
None => Ok(false),
}
}
async fn get(&self, key: &[u8]) -> io::Result<Vec<u8>> {
if self.closed.load(Ordering::Relaxed) {
return Err(Error::DatabaseClosed.to_err());
}
let db = self.state.read().await;
match db.get(&key.to_vec()) {
Some(key) => Ok(key.to_vec()),
None => Err(Error::NotFound.to_err()),
}
}
async fn put(&mut self, key: &[u8], value: &[u8]) -> io::Result<()> {
if self.closed.load(Ordering::Relaxed) {
return Err(Error::DatabaseClosed.to_err());
}
let mut db = self.state.write().await;
db.insert(key.to_vec(), value.to_vec());
Ok(())
}
async fn delete(&mut self, key: &[u8]) -> io::Result<()> {
if self.closed.load(Ordering::Relaxed) {
return Err(Error::DatabaseClosed.to_err());
}
let mut db = self.state.write().await;
db.remove(&key.to_vec());
Ok(())
}
}
#[tonic::async_trait]
impl super::Closer for Database {
async fn close(&self) -> io::Result<()> {
if self.closed.load(Ordering::Relaxed) {
return Err(Error::DatabaseClosed.to_err());
}
self.closed.store(true, Ordering::Relaxed);
Ok(())
}
}
#[tonic::async_trait]
impl crate::subnet::rpc::health::Checkable for Database {
async fn health_check(&self) -> io::Result<Vec<u8>> {
if self.closed.load(Ordering::Relaxed) {
return Err(Error::DatabaseClosed.to_err());
}
Ok(vec![])
}
}
#[tonic::async_trait]
impl super::iterator::Iteratee for Database {
async fn new_iterator(&self) -> io::Result<BoxedIterator> {
self.new_iterator_with_start_and_prefix(&[], &[]).await
}
async fn new_iterator_with_start(&self, start: &[u8]) -> io::Result<BoxedIterator> {
self.new_iterator_with_start_and_prefix(start, &[]).await
}
async fn new_iterator_with_prefix(&self, prefix: &[u8]) -> io::Result<BoxedIterator> {
self.new_iterator_with_start_and_prefix(&[], prefix).await
}
async fn new_iterator_with_start_and_prefix(
&self,
start: &[u8],
prefix: &[u8],
) -> io::Result<BoxedIterator> {
if self.closed.load(Ordering::Relaxed) {
return Err(Error::DatabaseClosed.to_err());
}
let db = self.state.read().await;
let mut keys: Vec<Vec<u8>> = Vec::with_capacity(db.len());
for (k, _v) in db.iter() {
if k.starts_with(prefix) && k >= &start.to_vec() {
keys.push(k.to_owned());
}
}
keys.sort();
let mut values: Vec<Vec<u8>> = Vec::with_capacity(keys.len());
for key in keys.iter() {
if let Some(v) = db.get(key) {
values.push(v.to_owned());
}
}
Ok(iterator::Iterator::new(
keys,
values,
Arc::clone(&self.closed),
))
}
}
#[tonic::async_trait]
impl crate::subnet::rpc::database::batch::Batcher for Database {
async fn new_batch(&self) -> io::Result<BoxedBatch> {
Ok(Box::new(batch::Batch::new(
Arc::clone(&self.state),
Arc::clone(&self.closed),
)))
}
}
impl crate::subnet::rpc::database::Database for Database {}
#[tokio::test]
async fn test_memdb() {
let mut db = Database::new();
let _ = db.put("foo".as_bytes(), "bar".as_bytes()).await;
let resp = db.get("notfound".as_bytes()).await;
assert!(resp.is_err());
assert_eq!(resp.err().unwrap().kind(), io::ErrorKind::NotFound);
let mut db = Database::new();
let _ = db.close().await;
let resp = db.put("foo".as_bytes(), "bar".as_bytes()).await;
assert!(resp.is_err());
assert_eq!(resp.err().unwrap().to_string(), "database closed");
let db = Database::new();
let _ = db.close().await;
let resp = db.get("foo".as_bytes()).await;
print!("found {:?}", resp);
assert!(resp.is_err());
assert_eq!(resp.err().unwrap().to_string(), "database closed");
let mut db = Database::new();
let _ = db.put("foo".as_bytes(), "bar".as_bytes()).await;
let resp = db.has("foo".as_bytes()).await;
assert!(!resp.is_err());
assert_eq!(resp.unwrap(), true);
let mut db = Database::new();
let _ = db.put("foo".as_bytes(), "bar".as_bytes()).await;
let _ = db.delete("foo".as_bytes()).await;
let resp = db.has("foo".as_bytes()).await;
assert!(!resp.is_err());
assert_eq!(resp.unwrap(), false);
let db = Database::new();
let resp = db.health_check().await;
assert!(!resp.is_err());
let _ = db.close().await;
let resp = db.health_check().await;
assert_eq!(resp.err().unwrap().to_string(), "database closed");
}