fabaccess-bffh/bffhd/resources/state/db.rs

110 lines
3.4 KiB
Rust

use thiserror::Error;
use crate::db;
use crate::db::{AlignedAdapter, ArchivedValue, RawDB, DB};
use lmdb::{DatabaseFlags, Environment, EnvironmentFlags, Transaction, WriteFlags};
use miette::{Diagnostic, LabeledSpan, Severity, SourceCode};
use std::any::TypeId;
use std::error::Error;
use std::fmt::{Debug, Display, Formatter};
use std::{path::Path, sync::Arc};
use crate::resources::state::State;
#[derive(Debug, Clone)]
pub struct StateDB {
env: Arc<Environment>,
db: DB<AlignedAdapter<State>>,
}
#[derive(Clone, Debug, PartialEq, Eq, Error, Diagnostic)]
pub enum StateDBError {
#[error("opening the state db environment failed")]
#[diagnostic(
code(bffh::db::state::open_env),
help("does the parent directory for state_db exist?")
)]
OpenEnv(#[source] db::Error),
#[error("opening the state db failed")]
#[diagnostic(code(bffh::db::state::open))]
Open(#[source] db::Error),
#[error("creating the state db failed")]
#[diagnostic(code(bffh::db::state::create))]
Create(#[source] db::Error),
}
impl StateDB {
pub fn open_env<P: AsRef<Path>>(path: P) -> Result<Arc<Environment>, StateDBError> {
Environment::new()
.set_flags(
EnvironmentFlags::WRITE_MAP
| EnvironmentFlags::NO_SUB_DIR
| EnvironmentFlags::NO_TLS
| EnvironmentFlags::NO_READAHEAD,
)
.set_max_dbs(8)
.open(path.as_ref())
.map(Arc::new)
.map_err(|e| StateDBError::OpenEnv(e.into()))
}
fn new(env: Arc<Environment>, db: RawDB) -> Self {
let db = DB::new(db);
Self { env, db }
}
pub fn open_with_env(env: Arc<Environment>) -> Result<Self, StateDBError> {
let db = unsafe { RawDB::open(&env, Some("state")) };
let db = db.map_err(|e| StateDBError::Open(e.into()))?;
Ok(Self::new(env, db))
}
pub fn open<P: AsRef<Path>>(path: P) -> Result<Self, StateDBError> {
let env = Self::open_env(path)?;
Self::open_with_env(env)
}
pub fn create_with_env(env: Arc<Environment>) -> Result<Self, StateDBError> {
let flags = DatabaseFlags::empty();
let db = unsafe { RawDB::create(&env, Some("state"), flags) };
let db = db.map_err(|e| StateDBError::Create(e.into()))?;
Ok(Self::new(env, db))
}
pub fn create<P: AsRef<Path>>(path: P) -> Result<Self, StateDBError> {
let env = Self::open_env(path)?;
Self::create_with_env(env)
}
pub fn begin_ro_txn(&self) -> Result<impl Transaction + '_, db::Error> {
self.env.begin_ro_txn().map_err(db::Error::from)
}
pub fn get(&self, key: impl AsRef<[u8]>) -> Result<Option<ArchivedValue<State>>, db::Error> {
let txn = self.env.begin_ro_txn()?;
self.db.get(&txn, &key.as_ref())
}
pub fn get_all<'txn, T: Transaction>(
&self,
txn: &'txn T,
) -> Result<impl IntoIterator<Item = (&'txn [u8], ArchivedValue<State>)>, db::Error> {
self.db.get_all(txn)
}
pub fn put(&self, key: &impl AsRef<[u8]>, val: &ArchivedValue<State>) -> Result<(), db::Error> {
let mut txn = self.env.begin_rw_txn()?;
let flags = WriteFlags::empty();
self.db.put(&mut txn, key, val, flags)?;
Ok(txn.commit()?)
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::ops::Deref;
}