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database: make open_db_rw() take &TxRw (#104)

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* env: take `&TxRw` in `open_db_rw()`

* heed: use `UnsafeCell` for write transactions

* backend: update tests

* add `trait DatabaseIter<T: Table>`

* heed: impl `trait DatabaseIter`, inline shared iter `fn`s

* env: make `open_db_ro()` return `impl DatabaseIter`

* heed: use full path for transaction fn calls

* tests: fix tx/table tests

* backend: fix redb

* heed: `UnsafeCell` -> `RefCell`

* docs

* remove unneeded `// SAFETY`

* Update database/src/backend/heed/env.rs

Co-authored-by: Boog900 <boog900@tutanota.com>

---------

Co-authored-by: Boog900 <boog900@tutanota.com>
This commit is contained in:
hinto-janai 2024-04-03 17:44:25 -04:00 committed by GitHub
parent 21697b8af5
commit 2813c92505
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GPG key ID: B5690EEEBB952194
9 changed files with 191 additions and 261 deletions
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129
database/src/backend/heed/database.rs
View file

@ -3,6 +3,7 @@
//---------------------------------------------------------------------------------------------------- Import
use std::{
borrow::{Borrow, Cow},
cell::RefCell,
fmt::Debug,
ops::RangeBounds,
sync::RwLockReadGuard,
@ -10,7 +11,7 @@ use std::{
use crate::{
backend::heed::{storable::StorableHeed, types::HeedDb},
database::{DatabaseRo, DatabaseRw},
database::{DatabaseIter, DatabaseRo, DatabaseRw},
error::RuntimeError,
table::Table,
};
@ -45,7 +46,7 @@ pub(super) struct HeedTableRw<'env, 'tx, T: Table> {
/// An already opened database table.
pub(super) db: HeedDb<T::Key, T::Value>,
/// The associated read/write transaction that opened this table.
pub(super) tx_rw: &'tx mut heed::RwTxn<'env>,
pub(super) tx_rw: &'tx RefCell<heed::RwTxn<'env>>,
}
//---------------------------------------------------------------------------------------------------- Shared functions
@ -63,46 +64,6 @@ fn get<T: Table>(
db.get(tx_ro, key)?.ok_or(RuntimeError::KeyNotFound)
}
/// Shared [`DatabaseRo::get_range()`].
#[inline]
fn get_range<'a, T: Table, Range>(
db: &'a HeedDb<T::Key, T::Value>,
tx_ro: &'a heed::RoTxn<'_>,
range: Range,
) -> Result<impl Iterator<Item = Result<T::Value, RuntimeError>> + 'a, RuntimeError>
where
Range: RangeBounds<T::Key> + 'a,
{
Ok(db.range(tx_ro, &range)?.map(|res| Ok(res?.1)))
}
/// Shared [`DatabaseRo::iter()`].
#[inline]
fn iter<'a, T: Table>(
db: &'a HeedDb<T::Key, T::Value>,
tx_ro: &'a heed::RoTxn<'_>,
) -> Result<impl Iterator<Item = Result<(T::Key, T::Value), RuntimeError>> + 'a, RuntimeError> {
Ok(db.iter(tx_ro)?.map(|res| Ok(res?)))
}
/// Shared [`DatabaseRo::keys()`].
#[inline]
fn keys<'a, T: Table>(
db: &'a HeedDb<T::Key, T::Value>,
tx_ro: &'a heed::RoTxn<'_>,
) -> Result<impl Iterator<Item = Result<T::Key, RuntimeError>> + 'a, RuntimeError> {
Ok(db.iter(tx_ro)?.map(|res| Ok(res?.0)))
}
/// Shared [`DatabaseRo::values()`].
#[inline]
fn values<'a, T: Table>(
db: &'a HeedDb<T::Key, T::Value>,
tx_ro: &'a heed::RoTxn<'_>,
) -> Result<impl Iterator<Item = Result<T::Value, RuntimeError>> + 'a, RuntimeError> {
Ok(db.iter(tx_ro)?.map(|res| Ok(res?.1)))
}
/// Shared [`DatabaseRo::len()`].
#[inline]
fn len<T: Table>(
@ -139,13 +100,8 @@ fn is_empty<T: Table>(
Ok(db.is_empty(tx_ro)?)
}
//---------------------------------------------------------------------------------------------------- DatabaseRo Impl
impl<T: Table> DatabaseRo<T> for HeedTableRo<'_, T> {
#[inline]
fn get(&self, key: &T::Key) -> Result<T::Value, RuntimeError> {
get::<T>(&self.db, self.tx_ro, key)
}
//---------------------------------------------------------------------------------------------------- DatabaseIter Impl
impl<T: Table> DatabaseIter<T> for HeedTableRo<'_, T> {
#[inline]
fn get_range<'a, Range>(
&'a self,
@ -154,7 +110,7 @@ impl<T: Table> DatabaseRo<T> for HeedTableRo<'_, T> {
where
Range: RangeBounds<T::Key> + 'a,
{
get_range::<T, Range>(&self.db, self.tx_ro, range)
Ok(self.db.range(self.tx_ro, &range)?.map(|res| Ok(res?.1)))
}
#[inline]
@ -162,21 +118,29 @@ impl<T: Table> DatabaseRo<T> for HeedTableRo<'_, T> {
&self,
) -> Result<impl Iterator<Item = Result<(T::Key, T::Value), RuntimeError>> + '_, RuntimeError>
{
iter::<T>(&self.db, self.tx_ro)
Ok(self.db.iter(self.tx_ro)?.map(|res| Ok(res?)))
}
#[inline]
fn keys(
&self,
) -> Result<impl Iterator<Item = Result<T::Key, RuntimeError>> + '_, RuntimeError> {
keys::<T>(&self.db, self.tx_ro)
Ok(self.db.iter(self.tx_ro)?.map(|res| Ok(res?.0)))
}
#[inline]
fn values(
&self,
) -> Result<impl Iterator<Item = Result<T::Value, RuntimeError>> + '_, RuntimeError> {
values::<T>(&self.db, self.tx_ro)
Ok(self.db.iter(self.tx_ro)?.map(|res| Ok(res?.1)))
}
}
//---------------------------------------------------------------------------------------------------- DatabaseRo Impl
impl<T: Table> DatabaseRo<T> for HeedTableRo<'_, T> {
#[inline]
fn get(&self, key: &T::Key) -> Result<T::Value, RuntimeError> {
get::<T>(&self.db, self.tx_ro, key)
}
#[inline]
@ -204,79 +168,48 @@ impl<T: Table> DatabaseRo<T> for HeedTableRo<'_, T> {
impl<T: Table> DatabaseRo<T> for HeedTableRw<'_, '_, T> {
#[inline]
fn get(&self, key: &T::Key) -> Result<T::Value, RuntimeError> {
get::<T>(&self.db, self.tx_rw, key)
}
#[inline]
fn get_range<'a, Range>(
&'a self,
range: Range,
) -> Result<impl Iterator<Item = Result<T::Value, RuntimeError>> + 'a, RuntimeError>
where
Range: RangeBounds<T::Key> + 'a,
{
get_range::<T, Range>(&self.db, self.tx_rw, range)
}
#[inline]
fn iter(
&self,
) -> Result<impl Iterator<Item = Result<(T::Key, T::Value), RuntimeError>> + '_, RuntimeError>
{
iter::<T>(&self.db, self.tx_rw)
}
#[inline]
fn keys(
&self,
) -> Result<impl Iterator<Item = Result<T::Key, RuntimeError>> + '_, RuntimeError> {
keys::<T>(&self.db, self.tx_rw)
}
#[inline]
fn values(
&self,
) -> Result<impl Iterator<Item = Result<T::Value, RuntimeError>> + '_, RuntimeError> {
values::<T>(&self.db, self.tx_rw)
get::<T>(&self.db, &self.tx_rw.borrow(), key)
}
#[inline]
fn len(&self) -> Result<u64, RuntimeError> {
len::<T>(&self.db, self.tx_rw)
len::<T>(&self.db, &self.tx_rw.borrow())
}
#[inline]
fn first(&self) -> Result<(T::Key, T::Value), RuntimeError> {
first::<T>(&self.db, self.tx_rw)
first::<T>(&self.db, &self.tx_rw.borrow())
}
#[inline]
fn last(&self) -> Result<(T::Key, T::Value), RuntimeError> {
last::<T>(&self.db, self.tx_rw)
last::<T>(&self.db, &self.tx_rw.borrow())
}
#[inline]
fn is_empty(&self) -> Result<bool, RuntimeError> {
is_empty::<T>(&self.db, self.tx_rw)
is_empty::<T>(&self.db, &self.tx_rw.borrow())
}
}
impl<T: Table> DatabaseRw<T> for HeedTableRw<'_, '_, T> {
#[inline]
fn put(&mut self, key: &T::Key, value: &T::Value) -> Result<(), RuntimeError> {
Ok(self.db.put(self.tx_rw, key, value)?)
Ok(self.db.put(&mut self.tx_rw.borrow_mut(), key, value)?)
}
#[inline]
fn delete(&mut self, key: &T::Key) -> Result<(), RuntimeError> {
self.db.delete(self.tx_rw, key)?;
self.db.delete(&mut self.tx_rw.borrow_mut(), key)?;
Ok(())
}
#[inline]
fn pop_first(&mut self) -> Result<(T::Key, T::Value), RuntimeError> {
let tx_rw = &mut self.tx_rw.borrow_mut();
// Get the first value first...
let Some(first) = self.db.first(self.tx_rw)? else {
let Some(first) = self.db.first(tx_rw)? else {
return Err(RuntimeError::KeyNotFound);
};
@ -286,7 +219,7 @@ impl<T: Table> DatabaseRw<T> for HeedTableRw<'_, '_, T> {
// remove the _first_ and only the first `(key, value)`.
// `delete()` removes all keys including duplicates which
// is slightly different behavior.
let mut iter = self.db.iter_mut(self.tx_rw)?;
let mut iter = self.db.iter_mut(tx_rw)?;
// SAFETY:
// It is undefined behavior to keep a reference of
@ -302,11 +235,13 @@ impl<T: Table> DatabaseRw<T> for HeedTableRw<'_, '_, T> {
#[inline]
fn pop_last(&mut self) -> Result<(T::Key, T::Value), RuntimeError> {
let Some(first) = self.db.last(self.tx_rw)? else {
let tx_rw = &mut self.tx_rw.borrow_mut();
let Some(first) = self.db.last(tx_rw)? else {
return Err(RuntimeError::KeyNotFound);
};
let mut iter = self.db.rev_iter_mut(self.tx_rw)?;
let mut iter = self.db.rev_iter_mut(tx_rw)?;
// SAFETY:
// It is undefined behavior to keep a reference of

43
database/src/backend/heed/env.rs
View file

@ -2,6 +2,7 @@
//---------------------------------------------------------------------------------------------------- Import
use std::{
cell::RefCell,
fmt::Debug,
ops::Deref,
sync::{RwLock, RwLockReadGuard, RwLockWriteGuard},
@ -16,7 +17,7 @@ use crate::{
types::HeedDb,
},
config::{Config, SyncMode},
database::{DatabaseRo, DatabaseRw},
database::{DatabaseIter, DatabaseRo, DatabaseRw},
env::{Env, EnvInner},
error::{InitError, RuntimeError},
resize::ResizeAlgorithm,
@ -96,7 +97,23 @@ impl Env for ConcreteEnv {
const SYNCS_PER_TX: bool = false;
type EnvInner<'env> = RwLockReadGuard<'env, heed::Env>;
type TxRo<'tx> = heed::RoTxn<'tx>;
type TxRw<'tx> = heed::RwTxn<'tx>;
/// HACK:
/// `heed::RwTxn` is wrapped in `RefCell` to allow:
/// - opening a database with only a `&` to it
/// - allowing 1 write tx to open multiple tables
///
/// Our mutable accesses are safe and will not panic as:
/// - Write transactions are `!Sync`
/// - A table operation does not hold a reference to the inner cell
/// once the call is over
/// - The function to manipulate the table takes the same type
/// of reference that the `RefCell` gets for that function
///
/// Also see:
/// - <https://github.com/Cuprate/cuprate/pull/102#discussion_r1548695610>
/// - <https://github.com/Cuprate/cuprate/pull/104>
type TxRw<'tx> = RefCell<heed::RwTxn<'tx>>;
#[cold]
#[inline(never)] // called once.
@ -263,7 +280,8 @@ impl Env for ConcreteEnv {
}
//---------------------------------------------------------------------------------------------------- EnvInner Impl
impl<'env> EnvInner<'env, heed::RoTxn<'env>, heed::RwTxn<'env>> for RwLockReadGuard<'env, heed::Env>
impl<'env> EnvInner<'env, heed::RoTxn<'env>, RefCell<heed::RwTxn<'env>>>
for RwLockReadGuard<'env, heed::Env>
where
Self: 'env,
{
@ -273,15 +291,15 @@ where
}
#[inline]
fn tx_rw(&'env self) -> Result<heed::RwTxn<'env>, RuntimeError> {
Ok(self.write_txn()?)
fn tx_rw(&'env self) -> Result<RefCell<heed::RwTxn<'env>>, RuntimeError> {
Ok(RefCell::new(self.write_txn()?))
}
#[inline]
fn open_db_ro<T: Table>(
&self,
tx_ro: &heed::RoTxn<'env>,
) -> Result<impl DatabaseRo<T>, RuntimeError> {
) -> Result<impl DatabaseRo<T> + DatabaseIter<T>, RuntimeError> {
// Open up a read-only database using our table's const metadata.
Ok(HeedTableRo {
db: self
@ -294,19 +312,26 @@ where
#[inline]
fn open_db_rw<T: Table>(
&self,
tx_rw: &mut heed::RwTxn<'env>,
tx_rw: &RefCell<heed::RwTxn<'env>>,
) -> Result<impl DatabaseRw<T>, RuntimeError> {
let tx_ro = tx_rw.borrow();
// Open up a read/write database using our table's const metadata.
Ok(HeedTableRw {
db: self
.open_database(tx_rw, Some(T::NAME))?
.open_database(&tx_ro, Some(T::NAME))?
.expect(PANIC_MSG_MISSING_TABLE),
tx_rw,
})
}
#[inline]
fn clear_db<T: Table>(&self, tx_rw: &mut heed::RwTxn<'env>) -> Result<(), RuntimeError> {
fn clear_db<T: Table>(
&self,
tx_rw: &mut RefCell<heed::RwTxn<'env>>,
) -> Result<(), RuntimeError> {
let tx_rw = tx_rw.get_mut();
// Open the table first...
let db: HeedDb<T::Key, T::Value> = self
.open_database(tx_rw, Some(T::NAME))?

14
database/src/backend/heed/transaction.rs
View file

@ -1,6 +1,6 @@
//! Implementation of `trait TxRo/TxRw` for `heed`.
use std::{ops::Deref, sync::RwLockReadGuard};
use std::{cell::RefCell, ops::Deref, sync::RwLockReadGuard};
//---------------------------------------------------------------------------------------------------- Import
use crate::{
@ -11,25 +11,25 @@ use crate::{
//---------------------------------------------------------------------------------------------------- TxRo
impl TxRo<'_> for heed::RoTxn<'_> {
fn commit(self) -> Result<(), RuntimeError> {
Ok(self.commit()?)
Ok(heed::RoTxn::commit(self)?)
}
}
//---------------------------------------------------------------------------------------------------- TxRw
impl TxRo<'_> for heed::RwTxn<'_> {
impl TxRo<'_> for RefCell<heed::RwTxn<'_>> {
fn commit(self) -> Result<(), RuntimeError> {
Ok(self.commit()?)
TxRw::commit(self)
}
}
impl TxRw<'_> for heed::RwTxn<'_> {
impl TxRw<'_> for RefCell<heed::RwTxn<'_>> {
fn commit(self) -> Result<(), RuntimeError> {
Ok(self.commit()?)
Ok(heed::RwTxn::commit(self.into_inner())?)
}
/// This function is infallible.
fn abort(self) -> Result<(), RuntimeError> {
self.abort();
heed::RwTxn::abort(self.into_inner());
Ok(())
}
}

122
database/src/backend/redb/database.rs
View file

@ -8,12 +8,14 @@ use std::{
ops::{Bound, Deref, RangeBounds},
};
use redb::ReadableTable;
use crate::{
backend::redb::{
storable::StorableRedb,
types::{RedbTableRo, RedbTableRw},
},
database::{DatabaseRo, DatabaseRw},
database::{DatabaseIter, DatabaseRo, DatabaseRw},
error::RuntimeError,
storable::Storable,
table::Table,
@ -33,54 +35,6 @@ fn get<T: Table + 'static>(
Ok(db.get(key)?.ok_or(RuntimeError::KeyNotFound)?.value())
}
/// Shared [`DatabaseRo::get_range()`].
#[inline]
fn get_range<'a, T: Table, Range>(
db: &'a impl redb::ReadableTable<StorableRedb<T::Key>, StorableRedb<T::Value>>,
range: Range,
) -> Result<impl Iterator<Item = Result<T::Value, RuntimeError>> + 'a, RuntimeError>
where
Range: RangeBounds<T::Key> + 'a,
{
Ok(db.range(range)?.map(|result| {
let (_key, value) = result?;
Ok(value.value())
}))
}
/// Shared [`DatabaseRo::iter()`].
#[inline]
fn iter<T: Table>(
db: &impl redb::ReadableTable<StorableRedb<T::Key>, StorableRedb<T::Value>>,
) -> Result<impl Iterator<Item = Result<(T::Key, T::Value), RuntimeError>> + '_, RuntimeError> {
Ok(db.iter()?.map(|result| {
let (key, value) = result?;
Ok((key.value(), value.value()))
}))
}
/// Shared [`DatabaseRo::iter()`].
#[inline]
fn keys<T: Table>(
db: &impl redb::ReadableTable<StorableRedb<T::Key>, StorableRedb<T::Value>>,
) -> Result<impl Iterator<Item = Result<T::Key, RuntimeError>> + '_, RuntimeError> {
Ok(db.iter()?.map(|result| {
let (key, _value) = result?;
Ok(key.value())
}))
}
/// Shared [`DatabaseRo::values()`].
#[inline]
fn values<T: Table>(
db: &impl redb::ReadableTable<StorableRedb<T::Key>, StorableRedb<T::Value>>,
) -> Result<impl Iterator<Item = Result<T::Value, RuntimeError>> + '_, RuntimeError> {
Ok(db.iter()?.map(|result| {
let (_key, value) = result?;
Ok(value.value())
}))
}
/// Shared [`DatabaseRo::len()`].
#[inline]
fn len<T: Table>(
@ -115,13 +69,8 @@ fn is_empty<T: Table>(
Ok(db.is_empty()?)
}
//---------------------------------------------------------------------------------------------------- DatabaseRo
impl<T: Table + 'static> DatabaseRo<T> for RedbTableRo<T::Key, T::Value> {
#[inline]
fn get(&self, key: &T::Key) -> Result<T::Value, RuntimeError> {
get::<T>(self, key)
}
//---------------------------------------------------------------------------------------------------- DatabaseIter
impl<T: Table + 'static> DatabaseIter<T> for RedbTableRo<T::Key, T::Value> {
#[inline]
fn get_range<'a, Range>(
&'a self,
@ -130,7 +79,10 @@ impl<T: Table + 'static> DatabaseRo<T> for RedbTableRo<T::Key, T::Value> {
where
Range: RangeBounds<T::Key> + 'a,
{
get_range::<T, Range>(self, range)
Ok(ReadableTable::range(self, range)?.map(|result| {
let (_key, value) = result?;
Ok(value.value())
}))
}
#[inline]
@ -138,21 +90,38 @@ impl<T: Table + 'static> DatabaseRo<T> for RedbTableRo<T::Key, T::Value> {
&self,
) -> Result<impl Iterator<Item = Result<(T::Key, T::Value), RuntimeError>> + '_, RuntimeError>
{
iter::<T>(self)
Ok(ReadableTable::iter(self)?.map(|result| {
let (key, value) = result?;
Ok((key.value(), value.value()))
}))
}
#[inline]
fn keys(
&self,
) -> Result<impl Iterator<Item = Result<T::Key, RuntimeError>> + '_, RuntimeError> {
keys::<T>(self)
Ok(ReadableTable::iter(self)?.map(|result| {
let (key, _value) = result?;
Ok(key.value())
}))
}
#[inline]
fn values(
&self,
) -> Result<impl Iterator<Item = Result<T::Value, RuntimeError>> + '_, RuntimeError> {
values::<T>(self)
Ok(ReadableTable::iter(self)?.map(|result| {
let (_key, value) = result?;
Ok(value.value())
}))
}
}
//---------------------------------------------------------------------------------------------------- DatabaseRo
impl<T: Table + 'static> DatabaseRo<T> for RedbTableRo<T::Key, T::Value> {
#[inline]
fn get(&self, key: &T::Key) -> Result<T::Value, RuntimeError> {
get::<T>(self, key)
}
#[inline]
@ -183,39 +152,6 @@ impl<T: Table + 'static> DatabaseRo<T> for RedbTableRw<'_, T::Key, T::Value> {
get::<T>(self, key)
}
#[inline]
fn get_range<'a, Range>(
&'a self,
range: Range,
) -> Result<impl Iterator<Item = Result<T::Value, RuntimeError>> + 'a, RuntimeError>
where
Range: RangeBounds<T::Key> + 'a,
{
get_range::<T, Range>(self, range)
}
#[inline]
fn iter(
&self,
) -> Result<impl Iterator<Item = Result<(T::Key, T::Value), RuntimeError>> + '_, RuntimeError>
{
iter::<T>(self)
}
#[inline]
fn keys(
&self,
) -> Result<impl Iterator<Item = Result<T::Key, RuntimeError>> + '_, RuntimeError> {
keys::<T>(self)
}
#[inline]
fn values(
&self,
) -> Result<impl Iterator<Item = Result<T::Value, RuntimeError>> + '_, RuntimeError> {
values::<T>(self)
}
#[inline]
fn len(&self) -> Result<u64, RuntimeError> {
len::<T>(self)

6
database/src/backend/redb/env.rs
View file

@ -9,7 +9,7 @@ use crate::{
types::{RedbTableRo, RedbTableRw},
},
config::{Config, SyncMode},
database::{DatabaseRo, DatabaseRw},
database::{DatabaseIter, DatabaseRo, DatabaseRw},
env::{Env, EnvInner},
error::{InitError, RuntimeError},
table::Table,
@ -186,7 +186,7 @@ where
fn open_db_ro<T: Table>(
&self,
tx_ro: &redb::ReadTransaction,
) -> Result<impl DatabaseRo<T>, RuntimeError> {
) -> Result<impl DatabaseRo<T> + DatabaseIter<T>, RuntimeError> {
// Open up a read-only database using our `T: Table`'s const metadata.
let table: redb::TableDefinition<'static, StorableRedb<T::Key>, StorableRedb<T::Value>> =
redb::TableDefinition::new(T::NAME);
@ -198,7 +198,7 @@ where
#[inline]
fn open_db_rw<T: Table>(
&self,
tx_rw: &mut redb::WriteTransaction,
tx_rw: &redb::WriteTransaction,
) -> Result<impl DatabaseRw<T>, RuntimeError> {
// Open up a read/write database using our `T: Table`'s const metadata.
let table: redb::TableDefinition<'static, StorableRedb<T::Key>, StorableRedb<T::Value>> =

82
database/src/backend/tests.rs
View file

@ -24,7 +24,7 @@ use std::borrow::{Borrow, Cow};
use crate::{
config::{Config, SyncMode},
database::{DatabaseRo, DatabaseRw},
database::{DatabaseIter, DatabaseRo, DatabaseRw},
env::{Env, EnvInner},
error::{InitError, RuntimeError},
resize::ResizeAlgorithm,
@ -81,7 +81,7 @@ fn open_db() {
let (env, _tempdir) = tmp_concrete_env();
let env_inner = env.env_inner();
let tx_ro = env_inner.tx_ro().unwrap();
let mut tx_rw = env_inner.tx_rw().unwrap();
let tx_rw = env_inner.tx_rw().unwrap();
// Open all tables in read-only mode.
// This should be updated when tables are modified.
@ -103,21 +103,21 @@ fn open_db() {
TxRo::commit(tx_ro).unwrap();
// Open all tables in read/write mode.
env_inner.open_db_rw::<BlockBlobs>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<BlockHeights>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<BlockInfoV1s>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<BlockInfoV2s>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<BlockInfoV3s>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<KeyImages>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<NumOutputs>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<Outputs>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<PrunableHashes>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<PrunableTxBlobs>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<PrunedTxBlobs>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<RctOutputs>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<TxHeights>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<TxIds>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<TxUnlockTime>(&mut tx_rw).unwrap();
env_inner.open_db_rw::<BlockBlobs>(&tx_rw).unwrap();
env_inner.open_db_rw::<BlockHeights>(&tx_rw).unwrap();
env_inner.open_db_rw::<BlockInfoV1s>(&tx_rw).unwrap();
env_inner.open_db_rw::<BlockInfoV2s>(&tx_rw).unwrap();
env_inner.open_db_rw::<BlockInfoV3s>(&tx_rw).unwrap();
env_inner.open_db_rw::<KeyImages>(&tx_rw).unwrap();
env_inner.open_db_rw::<NumOutputs>(&tx_rw).unwrap();
env_inner.open_db_rw::<Outputs>(&tx_rw).unwrap();
env_inner.open_db_rw::<PrunableHashes>(&tx_rw).unwrap();
env_inner.open_db_rw::<PrunableTxBlobs>(&tx_rw).unwrap();
env_inner.open_db_rw::<PrunedTxBlobs>(&tx_rw).unwrap();
env_inner.open_db_rw::<RctOutputs>(&tx_rw).unwrap();
env_inner.open_db_rw::<TxHeights>(&tx_rw).unwrap();
env_inner.open_db_rw::<TxIds>(&tx_rw).unwrap();
env_inner.open_db_rw::<TxUnlockTime>(&tx_rw).unwrap();
TxRw::commit(tx_rw).unwrap();
}
@ -166,11 +166,12 @@ fn non_manual_resize_2() {
/// Test all `DatabaseR{o,w}` operations.
#[test]
#[allow(clippy::too_many_lines)]
fn db_read_write() {
let (env, _tempdir) = tmp_concrete_env();
let env_inner = env.env_inner();
let mut tx_rw = env_inner.tx_rw().unwrap();
let mut table = env_inner.open_db_rw::<Outputs>(&mut tx_rw).unwrap();
let tx_rw = env_inner.tx_rw().unwrap();
let mut table = env_inner.open_db_rw::<Outputs>(&tx_rw).unwrap();
/// The (1st) key.
const KEY: PreRctOutputId = PreRctOutputId {
@ -221,9 +222,17 @@ fn db_read_write() {
assert_same(last);
}
// Commit transactions, create new ones.
drop(table);
TxRw::commit(tx_rw).unwrap();
let tx_ro = env_inner.tx_ro().unwrap();
let table_ro = env_inner.open_db_ro::<Outputs>(&tx_ro).unwrap();
let tx_rw = env_inner.tx_rw().unwrap();
let mut table = env_inner.open_db_rw::<Outputs>(&tx_rw).unwrap();
// Assert the whole range is there.
{
let range = table.get_range(..).unwrap();
let range = table_ro.get_range(..).unwrap();
let mut i = 0;
for result in range {
let value: Output = result.unwrap();
@ -240,11 +249,14 @@ fn db_read_write() {
let range = KEY..key;
// Assert count is correct.
assert_eq!(N as usize, table.get_range(range.clone()).unwrap().count());
assert_eq!(
N as usize,
table_ro.get_range(range.clone()).unwrap().count()
);
// Assert each returned value from the iterator is owned.
{
let mut iter = table.get_range(range.clone()).unwrap();
let mut iter = table_ro.get_range(range.clone()).unwrap();
let value: Output = iter.next().unwrap().unwrap(); // 1. take value out
drop(iter); // 2. drop the `impl Iterator + 'a`
assert_same(value); // 3. assert even without the iterator, the value is alive
@ -252,7 +264,7 @@ fn db_read_write() {
// Assert each value is the same.
{
let mut iter = table.get_range(range).unwrap();
let mut iter = table_ro.get_range(range).unwrap();
for _ in 0..N {
let value: Output = iter.next().unwrap().unwrap();
assert_same(value);
@ -273,17 +285,13 @@ fn db_read_write() {
}
drop(table);
tx_rw.commit().unwrap();
let mut tx_rw = env_inner.tx_rw().unwrap();
TxRw::commit(tx_rw).unwrap();
// Assert `clear_db()` works.
{
// Make sure this works even if readers have the table open.
let tx_ro = env_inner.tx_ro().unwrap();
let reader_table = env_inner.open_db_ro::<Outputs>(&tx_ro).unwrap();
let mut tx_rw = env_inner.tx_rw().unwrap();
env_inner.clear_db::<Outputs>(&mut tx_rw).unwrap();
let table = env_inner.open_db_rw::<Outputs>(&mut tx_rw).unwrap();
let table = env_inner.open_db_rw::<Outputs>(&tx_rw).unwrap();
assert!(table.is_empty().unwrap());
for n in 0..N {
let mut key = KEY;
@ -294,7 +302,7 @@ fn db_read_write() {
}
// Reader still sees old value.
assert!(!reader_table.is_empty().unwrap());
assert!(!table_ro.is_empty().unwrap());
// Writer sees updated value (nothing).
assert!(table.is_empty().unwrap());
@ -345,11 +353,19 @@ macro_rules! test_tables {
assert!(table.contains(&KEY).unwrap());
assert_eq!(table.len().unwrap(), 1);
// Commit transactions, create new ones.
drop(table);
TxRw::commit(tx_rw).unwrap();
let mut tx_rw = env_inner.tx_rw().unwrap();
let tx_ro = env_inner.tx_ro().unwrap();
let mut table = env_inner.open_db_rw::<$table>(&tx_rw).unwrap();
let table_ro = env_inner.open_db_ro::<$table>(&tx_ro).unwrap();
// Assert `get_range()` works.
{
let range = KEY..;
assert_eq!(1, table.get_range(range.clone()).unwrap().count());
let mut iter = table.get_range(range).unwrap();
assert_eq!(1, table_ro.get_range(range.clone()).unwrap().count());
let mut iter = table_ro.get_range(range).unwrap();
let value = iter.next().unwrap().unwrap();
assert_eq(&value);
}

45
database/src/database.rs
View file

@ -13,22 +13,20 @@ use crate::{
transaction::{TxRo, TxRw},
};
//---------------------------------------------------------------------------------------------------- DatabaseRo
/// Database (key-value store) read abstraction.
//---------------------------------------------------------------------------------------------------- DatabaseRoIter
/// Database (key-value store) read-only iteration abstraction.
///
/// This is a read-only database table,
/// write operations are defined in [`DatabaseRw`].
pub trait DatabaseRo<T: Table> {
/// Get the value corresponding to a key.
///
/// The returned value is _owned_.
///
/// # Errors
/// This will return [`RuntimeError::KeyNotFound`] wrapped in [`Err`] if `key` does not exist.
///
/// It will return other [`RuntimeError`]'s on things like IO errors as well.
fn get(&self, key: &T::Key) -> Result<T::Value, RuntimeError>;
/// These are read-only iteration-related operations that
/// can only be called from [`DatabaseRo`] objects.
///
/// # Hack
/// This is a HACK to get around the fact our read/write tables
/// cannot safely return values returning lifetimes, as such,
/// only read-only tables implement this trait.
///
/// - <https://github.com/Cuprate/cuprate/pull/102#discussion_r1548695610>
/// - <https://github.com/Cuprate/cuprate/pull/104>
pub trait DatabaseIter<T: Table> {
/// Get an iterator of value's corresponding to a range of keys.
///
/// For example:
@ -77,6 +75,23 @@ pub trait DatabaseRo<T: Table> {
fn values(
&self,
) -> Result<impl Iterator<Item = Result<T::Value, RuntimeError>> + '_, RuntimeError>;
}
//---------------------------------------------------------------------------------------------------- DatabaseRo
/// Database (key-value store) read abstraction.
///
/// This is a read-only database table,
/// write operations are defined in [`DatabaseRw`].
pub trait DatabaseRo<T: Table> {
/// Get the value corresponding to a key.
///
/// The returned value is _owned_.
///
/// # Errors
/// This will return [`RuntimeError::KeyNotFound`] wrapped in [`Err`] if `key` does not exist.
///
/// It will return other [`RuntimeError`]'s on things like IO errors as well.
fn get(&self, key: &T::Key) -> Result<T::Value, RuntimeError>;
/// TODO
///

9
database/src/env.rs
View file

@ -5,7 +5,7 @@ use std::{fmt::Debug, ops::Deref};
use crate::{
config::Config,
database::{DatabaseRo, DatabaseRw},
database::{DatabaseIter, DatabaseRo, DatabaseRw},
error::{InitError, RuntimeError},
resize::ResizeAlgorithm,
table::Table,
@ -201,7 +201,10 @@ where
/// As [`Table`] is `Sealed`, and all tables are created
/// upon [`Env::open`], this function will never error because
/// a table doesn't exist.
fn open_db_ro<T: Table>(&self, tx_ro: &Ro) -> Result<impl DatabaseRo<T>, RuntimeError>;
fn open_db_ro<T: Table>(
&self,
tx_ro: &Ro,
) -> Result<impl DatabaseRo<T> + DatabaseIter<T>, RuntimeError>;
/// Open a database in read/write mode.
///
@ -217,7 +220,7 @@ where
/// As [`Table`] is `Sealed`, and all tables are created
/// upon [`Env::open`], this function will never error because
/// a table doesn't exist.
fn open_db_rw<T: Table>(&self, tx_rw: &mut Rw) -> Result<impl DatabaseRw<T>, RuntimeError>;
fn open_db_rw<T: Table>(&self, tx_rw: &Rw) -> Result<impl DatabaseRw<T>, RuntimeError>;
/// Clear all `(key, value)`'s from a database table.
///

2
database/src/lib.rs
View file

@ -222,7 +222,7 @@ pub use constants::{
};
mod database;
pub use database::{DatabaseRo, DatabaseRw};
pub use database::{DatabaseIter, DatabaseRo, DatabaseRw};
mod env;
pub use env::{Env, EnvInner};