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Abstract database behind generic interface and implement alternative drivers (#322)

Browse source 
- [x] Design interface
- [x] Implement Sled backend
  - [x] Re-implement the SledCountedTree hack ~~on Sled backend~~ on all backends (i.e. over the abstraction)
- [x] Convert Garage code to use generic interface
- [x] Proof-read converted Garage code
- [ ] Test everything well
- [x] Implement sqlite backend
- [x] Implement LMDB backend
- [ ] (Implement Persy backend?)
- [ ] (Implement other backends? (like RocksDB, ...))
- [x] Implement backend choice in config file and garage server module
- [x] Add CLI for converting between DB formats
- Exploit the new interface to put more things in transactions
  - [x] `.updated()` trigger on Garage tables

Fix #284

**Bugs**

- [x] When exporting sqlite, trees iterate empty??
- [x] LMDB doesn't work

**Known issues for various back-ends**

- Sled:
  - Eats all my RAM and also all my disk space
  - `.len()` has to traverse the whole table
  - Is actually quite slow on some operations
  - And is actually pretty bad code...
- Sqlite:
  - Requires a lock to be taken on all operations. The lock is also taken when iterating on a table with `.iter()`, and the lock isn't released until the iterator is dropped. This means that we must be VERY carefull to not do anything else inside a `.iter()` loop or else we will have a deadlock! Most such cases have been eliminated from the Garage codebase, but there might still be some that remain. If your Garage-over-Sqlite seems to hang/freeze, this is the reason.
  - (adapter uses a bunch of unsafe code)
- Heed (LMDB):
  - Not suited for 32-bit machines as it has to map the whole DB in memory.
  - (adpater uses a tiny bit of unsafe code)

**My recommendation:** avoid 32-bit machines and use LMDB as much as possible.

**Converting databases** is actually quite easy. For example from Sled to LMDB:

```bash
cd src/db
cargo run --features cli --bin convert -- -i path/to/garage/meta/db -a sled -o path/to/garage/meta/db.lmdb -b lmdb
```

Then, just add this to your `config.toml`:

```toml
db_engine = "lmdb"
```

Co-authored-by: Alex Auvolat <alex@adnab.me>
Reviewed-on: Deuxfleurs/garage#322
Co-authored-by: Alex <alex@adnab.me>
Co-committed-by: Alex <alex@adnab.me>
This commit is contained in:
Alex 2022-06-08 10:01:44 +02:00
parent 7eed3ceda9
commit b44d3fc796
42 changed files with 3086 additions and 641 deletions
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257
Cargo.lock generated
View file

@ -2,6 +2,17 @@
# It is not intended for manual editing.
version = 3
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@ -370,6 +396,12 @@ dependencies = [
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@ -495,8 +527,8 @@ version = "0.5.4"
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@ -603,7 +654,7 @@ version = "4.0.2"
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"synstructure",
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@ -889,6 +952,7 @@ dependencies = [
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"futures-util",
"garage_api",
"garage_db",
"garage_model 0.7.0",
"garage_rpc 0.7.0",
"garage_table 0.7.0",
@ -911,7 +975,6 @@ dependencies = [
"serde_bytes",
"serde_json",
"sha2",
"sled",
"static_init",
"structopt",
"tokio",
@ -972,6 +1035,7 @@ dependencies = [
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"garage_db",
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@ -981,12 +1045,26 @@ dependencies = [
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"zstd",
]
[[package]]
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[[package]]
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@ -1024,6 +1102,7 @@ dependencies = [
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"futures-util",
"garage_block",
"garage_db",
"garage_model 0.5.1",
"garage_rpc 0.7.0",
"garage_table 0.7.0",
@ -1035,7 +1114,6 @@ dependencies = [
"rmp-serde 0.15.5",
"serde",
"serde_bytes",
"sled",
"tokio",
"tracing",
"zstd",
@ -1130,6 +1208,7 @@ dependencies = [
"bytes 1.1.0",
"futures",
"futures-util",
"garage_db",
"garage_rpc 0.7.0",
"garage_util 0.7.0",
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@ -1138,7 +1217,6 @@ dependencies = [
"rmp-serde 0.15.5",
"serde",
"serde_bytes",
"sled",
"tokio",
"tracing",
]
@ -1177,6 +1255,7 @@ dependencies = [
"chrono",
"err-derive 0.3.1",
"futures",
"garage_db",
"hex",
"http",
"hyper",
@ -1187,7 +1266,6 @@ dependencies = [
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"sha2",
"sled",
"tokio",
"toml",
"tracing",
@ -1237,7 +1315,7 @@ version = "0.2.5"
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@ -1503,7 +1632,7 @@ version = "0.1.12"
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@ -1758,12 +1887,34 @@ dependencies = [
"walkdir",
]
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@ -1779,7 +1930,7 @@ version = "0.4.16"
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@ -1855,6 +2006,15 @@ dependencies = [
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dependencies = [
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]
[[package]]
name = "multer"
version = "2.0.2"
@ -1928,7 +2088,7 @@ dependencies = [
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"async-trait",
"bytes 0.6.0",
"cfg-if",
"cfg-if 1.0.0",
"err-derive 0.2.4",
"futures",
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@ -2021,7 +2181,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"bitflags",
"cfg-if",
"cfg-if 1.0.0",
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"libc",
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@ -2134,6 +2294,16 @@ version = "6.0.1"
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dependencies = [
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]
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name = "parking_lot"
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@ -2161,7 +2331,7 @@ version = "0.8.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -2175,7 +2345,7 @@ version = "0.9.1"
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"libc",
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"smallvec",
@ -2357,7 +2527,7 @@ version = "0.13.0"
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@ -2679,6 +2849,21 @@ dependencies = [
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]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -2894,7 +3079,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"cpufeatures",
"digest",
"opaque-debug",
@ -2929,7 +3114,7 @@ checksum = "7f96b4737c2ce5987354855aed3797279def4ebf734436c6aa4552cf8e169935"
dependencies = [
"crc32fast",
"crossbeam-epoch",
"crossbeam-utils",
"crossbeam-utils 0.8.8",
"fs2",
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"libc",
@ -3063,6 +3248,15 @@ dependencies = [
"unicode-xid",
]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"crossbeam-queue",
]
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name = "synstructure"
version = "0.12.6"
@ -3081,7 +3275,7 @@ version = "3.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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"libc",
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@ -3380,7 +3574,7 @@ version = "0.1.32"
source = "registry+https://github.com/rust-lang/crates.io-index"
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"cfg-if",
"cfg-if 1.0.0",
"log",
"pin-project-lite",
"tracing-attributes",
@ -3489,6 +3683,15 @@ dependencies = [
"percent-encoding",
]
[[package]]
name = "uuid"
version = "0.8.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bc5cf98d8186244414c848017f0e2676b3fcb46807f6668a97dfe67359a3c4b7"
dependencies = [
"getrandom",
]
[[package]]
name = "vcpkg"
version = "0.2.15"
@ -3540,7 +3743,7 @@ version = "0.2.79"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "25f1af7423d8588a3d840681122e72e6a24ddbcb3f0ec385cac0d12d24256c06"
dependencies = [
"cfg-if",
"cfg-if 1.0.0",
"wasm-bindgen-macro",
]

694
Cargo.nix
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1
Cargo.toml
View file

@ -1,5 +1,6 @@
[workspace]
members = [
"src/db",
"src/util",
"src/rpc",
"src/table",

2
src/api/admin/cluster.rs
View file

@ -19,6 +19,7 @@ pub async fn handle_get_cluster_status(garage: &Arc<Garage>) -> Result<Response<
let res = GetClusterStatusResponse {
node: hex::encode(garage.system.id),
garage_version: garage.system.garage_version(),
db_engine: garage.db.engine(),
known_nodes: garage
.system
.get_known_nodes()
@ -98,6 +99,7 @@ fn get_cluster_layout(garage: &Arc<Garage>) -> GetClusterLayoutResponse {
struct GetClusterStatusResponse {
node: String,
garage_version: &'static str,
db_engine: String,
known_nodes: HashMap<String, KnownNodeResp>,
layout: GetClusterLayoutResponse,
}

3
src/block/Cargo.toml
View file

@ -14,6 +14,7 @@ path = "lib.rs"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
garage_db = { version = "0.8.0", path = "../db" }
garage_rpc = { version = "0.7.0", path = "../rpc" }
garage_util = { version = "0.7.0", path = "../util" }
garage_table = { version = "0.7.0", path = "../table" }
@ -27,8 +28,6 @@ tracing = "0.1.30"
rand = "0.8"
zstd = { version = "0.9", default-features = false }
sled = "0.34"
rmp-serde = "0.15"
serde = { version = "1.0", default-features = false, features = ["derive", "rc"] }
serde_bytes = "0.11"

127
src/block/manager.rs
View file

@ -1,3 +1,5 @@
use core::ops::Bound;
use std::convert::TryInto;
use std::path::{Path, PathBuf};
use std::sync::Arc;
@ -17,10 +19,12 @@ use opentelemetry::{
Context, KeyValue,
};
use garage_db as db;
use garage_db::counted_tree_hack::CountedTree;
use garage_util::data::*;
use garage_util::error::*;
use garage_util::metrics::RecordDuration;
use garage_util::sled_counter::SledCountedTree;
use garage_util::time::*;
use garage_util::tranquilizer::Tranquilizer;
@ -91,9 +95,9 @@ pub struct BlockManager {
rc: BlockRc,
resync_queue: SledCountedTree,
resync_queue: CountedTree,
resync_notify: Notify,
resync_errors: SledCountedTree,
resync_errors: CountedTree,
system: Arc<System>,
endpoint: Arc<Endpoint<BlockRpc, Self>>,
@ -108,7 +112,7 @@ struct BlockManagerLocked();
impl BlockManager {
pub fn new(
db: &sled::Db,
db: &db::Db,
data_dir: PathBuf,
compression_level: Option<i32>,
background_tranquility: u32,
@ -123,12 +127,14 @@ impl BlockManager {
let resync_queue = db
.open_tree("block_local_resync_queue")
.expect("Unable to open block_local_resync_queue tree");
let resync_queue = SledCountedTree::new(resync_queue);
let resync_queue =
CountedTree::new(resync_queue).expect("Could not count block_local_resync_queue");
let resync_errors = db
.open_tree("block_local_resync_errors")
.expect("Unable to open block_local_resync_errors tree");
let resync_errors = SledCountedTree::new(resync_errors);
let resync_errors =
CountedTree::new(resync_errors).expect("Could not count block_local_resync_errors");
let endpoint = system
.netapp
@ -219,11 +225,44 @@ impl BlockManager {
/// to fix any mismatch between the two.
pub async fn repair_data_store(&self, must_exit: &watch::Receiver<bool>) -> Result<(), Error> {
// 1. Repair blocks from RC table.
for (i, entry) in self.rc.rc.iter().enumerate() {
let (hash, _) = entry?;
let hash = Hash::try_from(&hash[..]).unwrap();
self.put_to_resync(&hash, Duration::from_secs(0))?;
if i & 0xFF == 0 && *must_exit.borrow() {
let mut next_start: Option<Hash> = None;
loop {
// We have to do this complicated two-step process where we first read a bunch
// of hashes from the RC table, and then insert them in the to-resync queue,
// because of SQLite. Basically, as long as we have an iterator on a DB table,
// we can't do anything else on the DB. The naive approach (which we had previously)
// of just iterating on the RC table and inserting items one to one in the resync
// queue can't work here, it would just provoke a deadlock in the SQLite adapter code.
// This is mostly because the Rust bindings for SQLite assume a worst-case scenario
// where SQLite is not compiled in thread-safe mode, so we have to wrap everything
// in a mutex (see db/sqlite_adapter.rs and discussion in PR #322).
let mut batch_of_hashes = vec![];
let start_bound = match next_start.as_ref() {
None => Bound::Unbounded,
Some(x) => Bound::Excluded(x.as_slice()),
};
for entry in self
.rc
.rc
.range::<&[u8], _>((start_bound, Bound::Unbounded))?
{
let (hash, _) = entry?;
let hash = Hash::try_from(&hash[..]).unwrap();
batch_of_hashes.push(hash);
if batch_of_hashes.len() >= 1000 {
break;
}
}
if batch_of_hashes.is_empty() {
break;
}
for hash in batch_of_hashes.into_iter() {
self.put_to_resync(&hash, Duration::from_secs(0))?;
next_start = Some(hash)
}
if *must_exit.borrow() {
return Ok(());
}
}
@ -264,46 +303,69 @@ impl BlockManager {
}
/// Get lenght of resync queue
pub fn resync_queue_len(&self) -> usize {
self.resync_queue.len()
pub fn resync_queue_len(&self) -> Result<usize, Error> {
// This currently can't return an error because the CountedTree hack
// doesn't error on .len(), but this will change when we remove the hack
// (hopefully someday!)
Ok(self.resync_queue.len())
}
/// Get number of blocks that have an error
pub fn resync_errors_len(&self) -> usize {
self.resync_errors.len()
pub fn resync_errors_len(&self) -> Result<usize, Error> {
// (see resync_queue_len comment)
Ok(self.resync_errors.len())
}
/// Get number of items in the refcount table
pub fn rc_len(&self) -> usize {
self.rc.rc.len()
pub fn rc_len(&self) -> Result<usize, Error> {
Ok(self.rc.rc.len()?)
}
//// ----- Managing the reference counter ----
/// Increment the number of time a block is used, putting it to resynchronization if it is
/// required, but not known
pub fn block_incref(&self, hash: &Hash) -> Result<(), Error> {
if self.rc.block_incref(hash)? {
pub fn block_incref(
self: &Arc<Self>,
tx: &mut db::Transaction,
hash: Hash,
) -> db::TxOpResult<()> {
if self.rc.block_incref(tx, &hash)? {
// When the reference counter is incremented, there is
// normally a node that is responsible for sending us the
// data of the block. However that operation may fail,
// so in all cases we add the block here to the todo list
// to check later that it arrived correctly, and if not
// we will fecth it from someone.
self.put_to_resync(hash, 2 * BLOCK_RW_TIMEOUT)?;
let this = self.clone();
tokio::spawn(async move {
if let Err(e) = this.put_to_resync(&hash, 2 * BLOCK_RW_TIMEOUT) {
error!("Block {:?} could not be put in resync queue: {}.", hash, e);
}
});
}
Ok(())
}
/// Decrement the number of time a block is used
pub fn block_decref(&self, hash: &Hash) -> Result<(), Error> {
if self.rc.block_decref(hash)? {
pub fn block_decref(
self: &Arc<Self>,
tx: &mut db::Transaction,
hash: Hash,
) -> db::TxOpResult<()> {
if self.rc.block_decref(tx, &hash)? {
// When the RC is decremented, it might drop to zero,
// indicating that we don't need the block.
// There is a delay before we garbage collect it;
// make sure that it is handled in the resync loop
// after that delay has passed.
self.put_to_resync(hash, BLOCK_GC_DELAY + Duration::from_secs(10))?;
let this = self.clone();
tokio::spawn(async move {
if let Err(e) = this.put_to_resync(&hash, BLOCK_GC_DELAY + Duration::from_secs(10))
{
error!("Block {:?} could not be put in resync queue: {}.", hash, e);
}
});
}
Ok(())
}
@ -503,12 +565,12 @@ impl BlockManager {
});
}
fn put_to_resync(&self, hash: &Hash, delay: Duration) -> Result<(), sled::Error> {
fn put_to_resync(&self, hash: &Hash, delay: Duration) -> db::Result<()> {
let when = now_msec() + delay.as_millis() as u64;
self.put_to_resync_at(hash, when)
}
fn put_to_resync_at(&self, hash: &Hash, when: u64) -> Result<(), sled::Error> {
fn put_to_resync_at(&self, hash: &Hash, when: u64) -> db::Result<()> {
trace!("Put resync_queue: {} {:?}", when, hash);
let mut key = u64::to_be_bytes(when).to_vec();
key.extend(hash.as_ref());
@ -547,13 +609,8 @@ impl BlockManager {
// - Ok(true) -> a block was processed (successfully or not)
// - Ok(false) -> no block was processed, but we are ready for the next iteration
// - Err(_) -> a Sled error occurred when reading/writing from resync_queue/resync_errors
async fn resync_iter(
&self,
must_exit: &mut watch::Receiver<bool>,
) -> Result<bool, sled::Error> {
if let Some(first_pair_res) = self.resync_queue.iter().next() {
let (time_bytes, hash_bytes) = first_pair_res?;
async fn resync_iter(&self, must_exit: &mut watch::Receiver<bool>) -> Result<bool, db::Error> {
if let Some((time_bytes, hash_bytes)) = self.resync_queue.first()? {
let time_msec = u64::from_be_bytes(time_bytes[0..8].try_into().unwrap());
let now = now_msec();
@ -561,7 +618,7 @@ impl BlockManager {
let hash = Hash::try_from(&hash_bytes[..]).unwrap();
if let Some(ec) = self.resync_errors.get(hash.as_slice())? {
let ec = ErrorCounter::decode(ec);
let ec = ErrorCounter::decode(&ec);
if now < ec.next_try() {
// if next retry after an error is not yet,
// don't do resync and return early, but still
@ -602,7 +659,7 @@ impl BlockManager {
warn!("Error when resyncing {:?}: {}", hash, e);
let err_counter = match self.resync_errors.get(hash.as_slice())? {
Some(ec) => ErrorCounter::decode(ec).add1(now + 1),
Some(ec) => ErrorCounter::decode(&ec).add1(now + 1),
None => ErrorCounter::new(now + 1),
};
@ -966,7 +1023,7 @@ impl ErrorCounter {
}
}
fn decode(data: sled::IVec) -> Self {
fn decode(data: &[u8]) -> Self {
Self {
errors: u64::from_be_bytes(data[0..8].try_into().unwrap()),
last_try: u64::from_be_bytes(data[8..16].try_into().unwrap()),

4
src/block/metrics.rs
View file

@ -1,6 +1,6 @@
use opentelemetry::{global, metrics::*};
use garage_util::sled_counter::SledCountedTree;
use garage_db::counted_tree_hack::CountedTree;
/// TableMetrics reference all counter used for metrics
pub struct BlockManagerMetrics {
@ -23,7 +23,7 @@ pub struct BlockManagerMetrics {
}
impl BlockManagerMetrics {
pub fn new(resync_queue: SledCountedTree, resync_errors: SledCountedTree) -> Self {
pub fn new(resync_queue: CountedTree, resync_errors: CountedTree) -> Self {
let meter = global::meter("garage_model/block");
Self {
_resync_queue_len: meter

49
src/block/rc.rs
View file

@ -1,5 +1,7 @@
use std::convert::TryInto;
use garage_db as db;
use garage_util::data::*;
use garage_util::error::*;
use garage_util::time::*;
@ -7,31 +9,41 @@ use garage_util::time::*;
use crate::manager::BLOCK_GC_DELAY;
pub struct BlockRc {
pub(crate) rc: sled::Tree,
pub(crate) rc: db::Tree,
}
impl BlockRc {
pub(crate) fn new(rc: sled::Tree) -> Self {
pub(crate) fn new(rc: db::Tree) -> Self {
Self { rc }
}
/// Increment the reference counter associated to a hash.
/// Returns true if the RC goes from zero to nonzero.
pub(crate) fn block_incref(&self, hash: &Hash) -> Result<bool, Error> {
let old_rc = self
.rc
.fetch_and_update(&hash, |old| RcEntry::parse_opt(old).increment().serialize())?;
let old_rc = RcEntry::parse_opt(old_rc);
pub(crate) fn block_incref(
&self,
tx: &mut db::Transaction,
hash: &Hash,
) -> db::TxOpResult<bool> {
let old_rc = RcEntry::parse_opt(tx.get(&self.rc, &hash)?);
match old_rc.increment().serialize() {
Some(x) => tx.insert(&self.rc, &hash, x)?,
None => unreachable!(),
};
Ok(old_rc.is_zero())
}
/// Decrement the reference counter associated to a hash.
/// Returns true if the RC is now zero.
pub(crate) fn block_decref(&self, hash: &Hash) -> Result<bool, Error> {
let new_rc = self
.rc
.update_and_fetch(&hash, |old| RcEntry::parse_opt(old).decrement().serialize())?;
let new_rc = RcEntry::parse_opt(new_rc);
pub(crate) fn block_decref(
&self,
tx: &mut db::Transaction,
hash: &Hash,
) -> db::TxOpResult<bool> {
let new_rc = RcEntry::parse_opt(tx.get(&self.rc, &hash)?).decrement();
match new_rc.serialize() {
Some(x) => tx.insert(&self.rc, &hash, x)?,
None => tx.remove(&self.rc, &hash)?,
};
Ok(matches!(new_rc, RcEntry::Deletable { .. }))
}
@ -44,12 +56,15 @@ impl BlockRc {
/// deletion time has passed
pub(crate) fn clear_deleted_block_rc(&self, hash: &Hash) -> Result<(), Error> {
let now = now_msec();
self.rc.update_and_fetch(&hash, |rcval| {
let updated = match RcEntry::parse_opt(rcval) {
RcEntry::Deletable { at_time } if now > at_time => RcEntry::Absent,
v => v,
self.rc.db().transaction(|mut tx| {
let rcval = RcEntry::parse_opt(tx.get(&self.rc, &hash)?);
match rcval {
RcEntry::Deletable { at_time } if now > at_time => {
tx.remove(&self.rc, &hash)?;
}
_ => (),
};
updated.serialize()
tx.commit(())
})?;
Ok(())
}

36
src/db/Cargo.toml Normal file
View file

@ -0,0 +1,36 @@
[package]
name = "garage_db"
version = "0.8.0"
authors = ["Alex Auvolat <alex@adnab.me>"]
edition = "2018"
license = "AGPL-3.0"
description = "Abstraction over multiple key/value storage engines that supports transactions"
repository = "https://git.deuxfleurs.fr/Deuxfleurs/garage"
readme = "../../README.md"
[lib]
path = "lib.rs"
[[bin]]
name = "convert"
path = "bin/convert.rs"
required-features = ["cli"]
[dependencies]
err-derive = "0.3"
hexdump = "0.1"
log = "0.4"
heed = "0.11"
rusqlite = { version = "0.27", features = ["bundled"] }
sled = "0.34"
# cli deps
clap = { version = "3.1.18", optional = true, features = ["derive", "env"] }
pretty_env_logger = { version = "0.4", optional = true }
[dev-dependencies]
mktemp = "0.4"
[features]
cli = ["clap", "pretty_env_logger"]

76
src/db/bin/convert.rs Normal file
View file

@ -0,0 +1,76 @@
use std::path::PathBuf;
use garage_db::*;
use clap::Parser;
/// K2V command line interface
#[derive(Parser, Debug)]
#[clap(author, version, about, long_about = None)]
struct Args {
/// Input DB path
#[clap(short = 'i')]
input_path: PathBuf,
/// Input DB engine
#[clap(short = 'a')]
input_engine: String,
/// Output DB path
#[clap(short = 'o')]
output_path: PathBuf,
/// Output DB engine
#[clap(short = 'b')]
output_engine: String,
}
fn main() {
let args = Args::parse();
pretty_env_logger::init();
match do_conversion(args) {
Ok(()) => println!("Success!"),
Err(e) => eprintln!("Error: {}", e),
}
}
fn do_conversion(args: Args) -> Result<()> {
let input = open_db(args.input_path, args.input_engine)?;
let output = open_db(args.output_path, args.output_engine)?;
output.import(&input)?;
Ok(())
}
fn open_db(path: PathBuf, engine: String) -> Result<Db> {
match engine.as_str() {
"sled" => {
let db = sled_adapter::sled::Config::default().path(&path).open()?;
Ok(sled_adapter::SledDb::init(db))
}
"sqlite" | "sqlite3" | "rusqlite" => {
let db = sqlite_adapter::rusqlite::Connection::open(&path)?;
Ok(sqlite_adapter::SqliteDb::init(db))
}
"lmdb" | "heed" => {
std::fs::create_dir_all(&path).map_err(|e| {
Error(format!("Unable to create LMDB data directory: {}", e).into())
})?;
let map_size = if u32::MAX as usize == usize::MAX {
eprintln!(
"LMDB is not recommended on 32-bit systems, database size will be limited"
);
1usize << 30 // 1GB for 32-bit systems
} else {
1usize << 40 // 1TB for 64-bit systems
};
let db = lmdb_adapter::heed::EnvOpenOptions::new()
.max_dbs(100)
.map_size(map_size)
.open(&path)
.unwrap();
Ok(lmdb_adapter::LmdbDb::init(db))
}
e => Err(Error(format!("Invalid DB engine: {}", e).into())),
}
}

127
src/db/counted_tree_hack.rs Normal file
View file

@ -0,0 +1,127 @@
//! This hack allows a db tree to keep in RAM a counter of the number of entries
//! it contains, which is used to call .len() on it. This is usefull only for
//! the sled backend where .len() otherwise would have to traverse the whole
//! tree to count items. For sqlite and lmdb, this is mostly useless (but
//! hopefully not harmfull!). Note that a CountedTree cannot be part of a
//! transaction.
use std::sync::{
atomic::{AtomicUsize, Ordering},
Arc,
};
use crate::{Result, Tree, TxError, Value, ValueIter};
#[derive(Clone)]
pub struct CountedTree(Arc<CountedTreeInternal>);
struct CountedTreeInternal {
tree: Tree,
len: AtomicUsize,
}
impl CountedTree {
pub fn new(tree: Tree) -> Result<Self> {
let len = tree.len()?;
Ok(Self(Arc::new(CountedTreeInternal {
tree,
len: AtomicUsize::new(len),
})))
}
pub fn len(&self) -> usize {
self.0.len.load(Ordering::SeqCst)
}
pub fn is_empty(&self) -> bool {
self.len() == 0
}
pub fn get<K: AsRef<[u8]>>(&self, key: K) -> Result<Option<Value>> {
self.0.tree.get(key)
}
pub fn first(&self) -> Result<Option<(Value, Value)>> {
self.0.tree.first()
}
pub fn iter(&self) -> Result<ValueIter<'_>> {
self.0.tree.iter()
}
// ---- writing functions ----
pub fn insert<K, V>(&self, key: K, value: V) -> Result<Option<Value>>
where
K: AsRef<[u8]>,
V: AsRef<[u8]>,
{
let old_val = self.0.tree.insert(key, value)?;
if old_val.is_none() {
self.0.len.fetch_add(1, Ordering::SeqCst);
}
Ok(old_val)
}
pub fn remove<K: AsRef<[u8]>>(&self, key: K) -> Result<Option<Value>> {
let old_val = self.0.tree.remove(key)?;
if old_val.is_some() {
self.0.len.fetch_sub(1, Ordering::SeqCst);
}
Ok(old_val)
}
pub fn compare_and_swap<K, OV, NV>(
&self,
key: K,
expected_old: Option<OV>,
new: Option<NV>,
) -> Result<bool>
where
K: AsRef<[u8]>,
OV: AsRef<[u8]>,
NV: AsRef<[u8]>,
{
let old_some = expected_old.is_some();
let new_some = new.is_some();
let tx_res = self.0.tree.db().transaction(|mut tx| {
let old_val = tx.get(&self.0.tree, &key)?;
let is_same = match (&old_val, &expected_old) {
(None, None) => true,
(Some(x), Some(y)) if x == y.as_ref() => true,
_ => false,
};
if is_same {
match &new {
Some(v) => {
tx.insert(&self.0.tree, &key, v)?;
}
None => {
tx.remove(&self.0.tree, &key)?;
}
}
tx.commit(())
} else {
tx.abort(())
}
});
match tx_res {
Ok(()) => {
match (old_some, new_some) {
(false, true) => {
self.0.len.fetch_add(1, Ordering::SeqCst);
}
(true, false) => {
self.0.len.fetch_sub(1, Ordering::SeqCst);
}
_ => (),
}
Ok(true)
}
Err(TxError::Abort(())) => Ok(false),
Err(TxError::Db(e)) => Err(e),
}
}
}

400
src/db/lib.rs Normal file
View file

@ -0,0 +1,400 @@
pub mod lmdb_adapter;
pub mod sled_adapter;
pub mod sqlite_adapter;
pub mod counted_tree_hack;
#[cfg(test)]
pub mod test;
use core::ops::{Bound, RangeBounds};
use std::borrow::Cow;
use std::cell::Cell;
use std::sync::Arc;
use err_derive::Error;
#[derive(Clone)]
pub struct Db(pub(crate) Arc<dyn IDb>);
pub struct Transaction<'a>(&'a mut dyn ITx);
#[derive(Clone)]
pub struct Tree(Arc<dyn IDb>, usize);
pub type Value = Vec<u8>;
pub type ValueIter<'a> = Box<dyn std::iter::Iterator<Item = Result<(Value, Value)>> + 'a>;
pub type TxValueIter<'a> = Box<dyn std::iter::Iterator<Item = TxOpResult<(Value, Value)>> + 'a>;
// ----
#[derive(Debug, Error)]
#[error(display = "{}", _0)]
pub struct Error(pub Cow<'static, str>);
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug, Error)]
#[error(display = "{}", _0)]
pub struct TxOpError(pub(crate) Error);
pub type TxOpResult<T> = std::result::Result<T, TxOpError>;
pub enum TxError<E> {
Abort(E),
Db(Error),
}
pub type TxResult<R, E> = std::result::Result<R, TxError<E>>;
impl<E> From<TxOpError> for TxError<E> {
fn from(e: TxOpError) -> TxError<E> {
TxError::Db(e.0)
}
}
pub fn unabort<R, E>(res: TxResult<R, E>) -> TxOpResult<std::result::Result<R, E>> {
match res {
Ok(v) => Ok(Ok(v)),
Err(TxError::Abort(e)) => Ok(Err(e)),
Err(TxError::Db(e)) => Err(TxOpError(e)),
}
}
// ----
impl Db {
pub fn engine(&self) -> String {
self.0.engine()
}
pub fn open_tree<S: AsRef<str>>(&self, name: S) -> Result<Tree> {
let tree_id = self.0.open_tree(name.as_ref())?;
Ok(Tree(self.0.clone(), tree_id))
}
pub fn list_trees(&self) -> Result<Vec<String>> {
self.0.list_trees()
}
pub fn transaction<R, E, F>(&self, fun: F) -> TxResult<R, E>
where
F: Fn(Transaction<'_>) -> TxResult<R, E>,
{
let f = TxFn {
function: fun,
result: Cell::new(None),
};
let tx_res = self.0.transaction(&f);
let ret = f
.result
.into_inner()
.expect("Transaction did not store result");
match tx_res {
Ok(()) => {
assert!(matches!(ret, Ok(_)));
ret
}
Err(TxError::Abort(())) => {
assert!(matches!(ret, Err(TxError::Abort(_))));
ret
}
Err(TxError::Db(e2)) => match ret {
// Ok was stored -> the error occured when finalizing
// transaction
Ok(_) => Err(TxError::Db(e2)),
// An error was already stored: that's the one we want to
// return
Err(TxError::Db(e)) => Err(TxError::Db(e)),
_ => unreachable!(),
},
}
}
pub fn import(&self, other: &Db) -> Result<()> {
let existing_trees = self.list_trees()?;
if !existing_trees.is_empty() {
return Err(Error(
format!(
"destination database already contains data: {:?}",
existing_trees
)
.into(),
));
}
let tree_names = other.list_trees()?;
for name in tree_names {
let tree = self.open_tree(&name)?;
if tree.len()? > 0 {
return Err(Error(format!("tree {} already contains data", name).into()));
}
let ex_tree = other.open_tree(&name)?;
let tx_res = self.transaction(|mut tx| {
let mut i = 0;
for item in ex_tree.iter().map_err(TxError::Abort)? {
let (k, v) = item.map_err(TxError::Abort)?;
tx.insert(&tree, k, v)?;
i += 1;
if i % 1000 == 0 {
println!("{}: imported {}", name, i);
}
}
tx.commit(i)
});
let total = match tx_res {
Err(TxError::Db(e)) => return Err(e),
Err(TxError::Abort(e)) => return Err(e),
Ok(x) => x,
};
println!("{}: finished importing, {} items", name, total);
}
Ok(())
}
}
#[allow(clippy::len_without_is_empty)]
impl Tree {
#[inline]
pub fn db(&self) -> Db {
Db(self.0.clone())
}
#[inline]
pub fn get<T: AsRef<[u8]>>(&self, key: T) -> Result<Option<Value>> {
self.0.get(self.1, key.as_ref())
}
#[inline]
pub fn len(&self) -> Result<usize> {
self.0.len(self.1)
}
#[inline]
pub fn first(&self) -> Result<Option<(Value, Value)>> {
self.iter()?.next().transpose()
}
#[inline]
pub fn get_gt<T: AsRef<[u8]>>(&self, from: T) -> Result<Option<(Value, Value)>> {
self.range((Bound::Excluded(from), Bound::Unbounded))?
.next()
.transpose()
}
/// Returns the old value if there was one
#[inline]
pub fn insert<T: AsRef<[u8]>, U: AsRef<[u8]>>(
&self,
key: T,
value: U,
) -> Result<Option<Value>> {
self.0.insert(self.1, key.as_ref(), value.as_ref())
}
/// Returns the old value if there was one
#[inline]
pub fn remove<T: AsRef<[u8]>>(&self, key: T) -> Result<Option<Value>> {
self.0.remove(self.1, key.as_ref())
}
#[inline]
pub fn iter(&self) -> Result<ValueIter<'_>> {
self.0.iter(self.1)
}
#[inline]
pub fn iter_rev(&self) -> Result<ValueIter<'_>> {
self.0.iter_rev(self.1)
}
#[inline]
pub fn range<K, R>(&self, range: R) -> Result<ValueIter<'_>>
where
K: AsRef<[u8]>,
R: RangeBounds<K>,
{
let sb = range.start_bound();
let eb = range.end_bound();
self.0.range(self.1, get_bound(sb), get_bound(eb))
}
#[inline]
pub fn range_rev<K, R>(&self, range: R) -> Result<ValueIter<'_>>
where
K: AsRef<[u8]>,
R: RangeBounds<K>,
{
let sb = range.start_bound();
let eb = range.end_bound();
self.0.range_rev(self.1, get_bound(sb), get_bound(eb))
}
}
#[allow(clippy::len_without_is_empty)]
impl<'a> Transaction<'a> {
#[inline]
pub fn get<T: AsRef<[u8]>>(&self, tree: &Tree, key: T) -> TxOpResult<Option<Value>> {
self.0.get(tree.1, key.as_ref())
}
#[inline]
pub fn len(&self, tree: &Tree) -> TxOpResult<usize> {
self.0.len(tree.1)
}
/// Returns the old value if there was one
#[inline]
pub fn insert<T: AsRef<[u8]>, U: AsRef<[u8]>>(
&mut self,
tree: &Tree,
key: T,
value: U,
) -> TxOpResult<Option<Value>> {
self.0.insert(tree.1, key.as_ref(), value.as_ref())
}
/// Returns the old value if there was one
#[inline]
pub fn remove<T: AsRef<[u8]>>(&mut self, tree: &Tree, key: T) -> TxOpResult<Option<Value>> {
self.0.remove(tree.1, key.as_ref())
}
#[inline]
pub fn iter(&self, tree: &Tree) -> TxOpResult<TxValueIter<'_>> {
self.0.iter(tree.1)
}
#[inline]
pub fn iter_rev(&self, tree: &Tree) -> TxOpResult<TxValueIter<'_>> {
self.0.iter_rev(tree.1)
}
#[inline]
pub fn range<K, R>(&self, tree: &Tree, range: R) -> TxOpResult<TxValueIter<'_>>
where
K: AsRef<[u8]>,
R: RangeBounds<K>,
{
let sb = range.start_bound();
let eb = range.end_bound();
self.0.range(tree.1, get_bound(sb), get_bound(eb))
}
#[inline]
pub fn range_rev<K, R>(&self, tree: &Tree, range: R) -> TxOpResult<TxValueIter<'_>>
where
K: AsRef<[u8]>,
R: RangeBounds<K>,
{
let sb = range.start_bound();
let eb = range.end_bound();
self.0.range_rev(tree.1, get_bound(sb), get_bound(eb))
}
// ----
#[inline]
pub fn abort<R, E>(self, e: E) -> TxResult<R, E> {
Err(TxError::Abort(e))
}
#[inline]
pub fn commit<R, E>(self, r: R) -> TxResult<R, E> {
Ok(r)
}
}
// ---- Internal interfaces
pub(crate) trait IDb: Send + Sync {
fn engine(&self) -> String;
fn open_tree(&self, name: &str) -> Result<usize>;
fn list_trees(&self) -> Result<Vec<String>>;
fn get(&self, tree: usize, key: &[u8]) -> Result<Option<Value>>;
fn len(&self, tree: usize) -> Result<usize>;
fn insert(&self, tree: usize, key: &[u8], value: &[u8]) -> Result<Option<Value>>;
fn remove(&self, tree: usize, key: &[u8]) -> Result<Option<Value>>;
fn iter(&self, tree: usize) -> Result<ValueIter<'_>>;
fn iter_rev(&self, tree: usize) -> Result<ValueIter<'_>>;
fn range<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> Result<ValueIter<'_>>;
fn range_rev<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> Result<ValueIter<'_>>;
fn transaction(&self, f: &dyn ITxFn) -> TxResult<(), ()>;
}
pub(crate) trait ITx {
fn get(&self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>>;
fn len(&self, tree: usize) -> TxOpResult<usize>;
fn insert(&mut self, tree: usize, key: &[u8], value: &[u8]) -> TxOpResult<Option<Value>>;
fn remove(&mut self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>>;
fn iter(&self, tree: usize) -> TxOpResult<TxValueIter<'_>>;
fn iter_rev(&self, tree: usize) -> TxOpResult<TxValueIter<'_>>;
fn range<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> TxOpResult<TxValueIter<'_>>;
fn range_rev<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> TxOpResult<TxValueIter<'_>>;
}
pub(crate) trait ITxFn {
fn try_on(&self, tx: &mut dyn ITx) -> TxFnResult;
}
pub(crate) enum TxFnResult {
Ok,
Abort,
DbErr,
}
struct TxFn<F, R, E>
where
F: Fn(Transaction<'_>) -> TxResult<R, E>,
{
function: F,
result: Cell<Option<TxResult<R, E>>>,
}
impl<F, R, E> ITxFn for TxFn<F, R, E>
where
F: Fn(Transaction<'_>) -> TxResult<R, E>,
{
fn try_on(&self, tx: &mut dyn ITx) -> TxFnResult {
let res = (self.function)(Transaction(tx));
let res2 = match &res {
Ok(_) => TxFnResult::Ok,
Err(TxError::Abort(_)) => TxFnResult::Abort,
Err(TxError::Db(_)) => TxFnResult::DbErr,
};
self.result.set(Some(res));
res2
}
}
// ----
fn get_bound<K: AsRef<[u8]>>(b: Bound<&K>) -> Bound<&[u8]> {
match b {
Bound::Included(v) => Bound::Included(v.as_ref()),
Bound::Excluded(v) => Bound::Excluded(v.as_ref()),
Bound::Unbounded => Bound::Unbounded,
}
}

329
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use core::ops::Bound;
use core::ptr::NonNull;
use std::collections::HashMap;
use std::convert::TryInto;
use std::sync::{Arc, RwLock};
use heed::types::ByteSlice;
use heed::{BytesDecode, Env, RoTxn, RwTxn, UntypedDatabase as Database};
use crate::{
Db, Error, IDb, ITx, ITxFn, Result, TxError, TxFnResult, TxOpError, TxOpResult, TxResult,
TxValueIter, Value, ValueIter,
};
pub use heed;
// -- err
impl From<heed::Error> for Error {
fn from(e: heed::Error) -> Error {
Error(format!("LMDB: {}", e).into())
}
}
impl From<heed::Error> for TxOpError {
fn from(e: heed::Error) -> TxOpError {
TxOpError(e.into())
}
}
// -- db
pub struct LmdbDb {
db: heed::Env,
trees: RwLock<(Vec<Database>, HashMap<String, usize>)>,
}
impl LmdbDb {
pub fn init(db: Env) -> Db {
let s = Self {
db,
trees: RwLock::new((Vec::new(), HashMap::new())),
};
Db(Arc::new(s))
}
fn get_tree(&self, i: usize) -> Result<Database> {
self.trees
.read()
.unwrap()
.0
.get(i)
.cloned()
.ok_or_else(|| Error("invalid tree id".into()))
}
}
impl IDb for LmdbDb {
fn engine(&self) -> String {
"LMDB (using Heed crate)".into()
}
fn open_tree(&self, name: &str) -> Result<usize> {
let mut trees = self.trees.write().unwrap();
if let Some(i) = trees.1.get(name) {
Ok(*i)
} else {
let tree = self.db.create_database(Some(name))?;
let i = trees.0.len();
trees.0.push(tree);
trees.1.insert(name.to_string(), i);
Ok(i)
}
}
fn list_trees(&self) -> Result<Vec<String>> {
let tree0 = match self.db.open_database::<heed::types::Str, ByteSlice>(None)? {
Some(x) => x,
None => return Ok(vec![]),
};
let mut ret = vec![];
let tx = self.db.read_txn()?;
for item in tree0.iter(&tx)? {
let (tree_name, _) = item?;
ret.push(tree_name.to_string());
}
drop(tx);
let mut ret2 = vec![];
for tree_name in ret {
if self
.db
.open_database::<ByteSlice, ByteSlice>(Some(&tree_name))?
.is_some()
{
ret2.push(tree_name);
}
}
Ok(ret2)
}
// ----
fn get(&self, tree: usize, key: &[u8]) -> Result<Option<Value>> {
let tree = self.get_tree(tree)?;
let tx = self.db.read_txn()?;
let val = tree.get(&tx, key)?;
match val {
None => Ok(None),
Some(v) => Ok(Some(v.to_vec())),
}
}
fn len(&self, tree: usize) -> Result<usize> {
let tree = self.get_tree(tree)?;
let tx = self.db.read_txn()?;
Ok(tree.len(&tx)?.try_into().unwrap())
}
fn insert(&self, tree: usize, key: &[u8], value: &[u8]) -> Result<Option<Value>> {
let tree = self.get_tree(tree)?;
let mut tx = self.db.write_txn()?;
let old_val = tree.get(&tx, key)?.map(Vec::from);
tree.put(&mut tx, key, value)?;
tx.commit()?;
Ok(old_val)
}
fn remove(&self, tree: usize, key: &[u8]) -> Result<Option<Value>> {
let tree = self.get_tree(tree)?;
let mut tx = self.db.write_txn()?;
let old_val = tree.get(&tx, key)?.map(Vec::from);
tree.delete(&mut tx, key)?;
tx.commit()?;
Ok(old_val)
}
fn iter(&self, tree: usize) -> Result<ValueIter<'_>> {
let tree = self.get_tree(tree)?;
let tx = self.db.read_txn()?;
TxAndIterator::make(tx, |tx| Ok(tree.iter(tx)?))
}
fn iter_rev(&self, tree: usize) -> Result<ValueIter<'_>> {
let tree = self.get_tree(tree)?;
let tx = self.db.read_txn()?;
TxAndIterator::make(tx, |tx| Ok(tree.rev_iter(tx)?))
}
fn range<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> Result<ValueIter<'_>> {
let tree = self.get_tree(tree)?;
let tx = self.db.read_txn()?;
TxAndIterator::make(tx, |tx| Ok(tree.range(tx, &(low, high))?))
}
fn range_rev<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> Result<ValueIter<'_>> {
let tree = self.get_tree(tree)?;
let tx = self.db.read_txn()?;
TxAndIterator::make(tx, |tx| Ok(tree.rev_range(tx, &(low, high))?))
}
// ----
fn transaction(&self, f: &dyn ITxFn) -> TxResult<(), ()> {
let trees = self.trees.read().unwrap();
let mut tx = LmdbTx {
trees: &trees.0[..],
tx: self
.db
.write_txn()
.map_err(Error::from)
.map_err(TxError::Db)?,
};
let res = f.try_on(&mut tx);
match res {
TxFnResult::Ok => {
tx.tx.commit().map_err(Error::from).map_err(TxError::Db)?;
Ok(())
}
TxFnResult::Abort => {
tx.tx.abort().map_err(Error::from).map_err(TxError::Db)?;
Err(TxError::Abort(()))
}
TxFnResult::DbErr => {
tx.tx.abort().map_err(Error::from).map_err(TxError::Db)?;
Err(TxError::Db(Error(
"(this message will be discarded)".into(),
)))
}
}
}
}
// ----
struct LmdbTx<'a> {
trees: &'a [Database],
tx: RwTxn<'a, 'a>,
}
impl<'a> LmdbTx<'a> {
fn get_tree(&self, i: usize) -> TxOpResult<&Database> {
self.trees.get(i).ok_or_else(|| {
TxOpError(Error(
"invalid tree id (it might have been openned after the transaction started)".into(),
))
})
}
}
impl<'a> ITx for LmdbTx<'a> {
fn get(&self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>> {
let tree = self.get_tree(tree)?;
match tree.get(&self.tx, key)? {
Some(v) => Ok(Some(v.to_vec())),
None => Ok(None),
}
}
fn len(&self, _tree: usize) -> TxOpResult<usize> {
unimplemented!(".len() in transaction not supported with LMDB backend")
}
fn insert(&mut self, tree: usize, key: &[u8], value: &[u8]) -> TxOpResult<Option<Value>> {
let tree = *self.get_tree(tree)?;
let old_val = tree.get(&self.tx, key)?.map(Vec::from);
tree.put(&mut self.tx, key, value)?;
Ok(old_val)
}
fn remove(&mut self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>> {
let tree = *self.get_tree(tree)?;
let old_val = tree.get(&self.tx, key)?.map(Vec::from);
tree.delete(&mut self.tx, key)?;
Ok(old_val)
}
fn iter(&self, _tree: usize) -> TxOpResult<TxValueIter<'_>> {
unimplemented!("Iterators in transactions not supported with LMDB backend");
}
fn iter_rev(&self, _tree: usize) -> TxOpResult<TxValueIter<'_>> {
unimplemented!("Iterators in transactions not supported with LMDB backend");
}
fn range<'r>(
&self,
_tree: usize,
_low: Bound<&'r [u8]>,
_high: Bound<&'r [u8]>,
) -> TxOpResult<TxValueIter<'_>> {
unimplemented!("Iterators in transactions not supported with LMDB backend");
}
fn range_rev<'r>(
&self,
_tree: usize,
_low: Bound<&'r [u8]>,
_high: Bound<&'r [u8]>,
) -> TxOpResult<TxValueIter<'_>> {
unimplemented!("Iterators in transactions not supported with LMDB backend");
}
}
// ----
type IteratorItem<'a> = heed::Result<(
<ByteSlice as BytesDecode<'a>>::DItem,
<ByteSlice as BytesDecode<'a>>::DItem,
)>;
struct TxAndIterator<'a, I>
where
I: Iterator<Item = IteratorItem<'a>> + 'a,
{
tx: RoTxn<'a>,
iter: Option<I>,
}
impl<'a, I> TxAndIterator<'a, I>
where
I: Iterator<Item = IteratorItem<'a>> + 'a,
{
fn make<F>(tx: RoTxn<'a>, iterfun: F) -> Result<ValueIter<'a>>
where
F: FnOnce(&'a RoTxn<'a>) -> Result<I>,
{
let mut res = TxAndIterator { tx, iter: None };
let tx = unsafe { NonNull::from(&res.tx).as_ref() };
res.iter = Some(iterfun(tx)?);
Ok(Box::new(res))
}
}
impl<'a, I> Drop for TxAndIterator<'a, I>
where
I: Iterator<Item = IteratorItem<'a>> + 'a,
{
fn drop(&mut self) {
drop(self.iter.take());
}
}
impl<'a, I> Iterator for TxAndIterator<'a, I>
where
I: Iterator<Item = IteratorItem<'a>> + 'a,
{
type Item = Result<(Value, Value)>;
fn next(&mut self) -> Option<Self::Item> {
match self.iter.as_mut().unwrap().next() {
None => None,
Some(Err(e)) => Some(Err(e.into())),
Some(Ok((k, v))) => Some(Ok((k.to_vec(), v.to_vec()))),
}
}
}

260
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use core::ops::Bound;
use std::cell::Cell;
use std::collections::HashMap;
use std::sync::{Arc, RwLock};
use sled::transaction::{
ConflictableTransactionError, TransactionError, Transactional, TransactionalTree,
UnabortableTransactionError,
};
use crate::{
Db, Error, IDb, ITx, ITxFn, Result, TxError, TxFnResult, TxOpError, TxOpResult, TxResult,
TxValueIter, Value, ValueIter,
};
pub use sled;
// -- err
impl From<sled::Error> for Error {
fn from(e: sled::Error) -> Error {
Error(format!("Sled: {}", e).into())
}
}
impl From<sled::Error> for TxOpError {
fn from(e: sled::Error) -> TxOpError {
TxOpError(e.into())
}
}
// -- db
pub struct SledDb {
db: sled::Db,
trees: RwLock<(Vec<sled::Tree>, HashMap<String, usize>)>,
}
impl SledDb {
pub fn init(db: sled::Db) -> Db {
let s = Self {
db,
trees: RwLock::new((Vec::new(), HashMap::new())),
};
Db(Arc::new(s))
}
fn get_tree(&self, i: usize) -> Result<sled::Tree> {
self.trees
.read()
.unwrap()
.0
.get(i)
.cloned()
.ok_or_else(|| Error("invalid tree id".into()))
}
}
impl IDb for SledDb {
fn engine(&self) -> String {
"Sled".into()
}
fn open_tree(&self, name: &str) -> Result<usize> {
let mut trees = self.trees.write().unwrap();
if let Some(i) = trees.1.get(name) {
Ok(*i)
} else {
let tree = self.db.open_tree(name)?;
let i = trees.0.len();
trees.0.push(tree);
trees.1.insert(name.to_string(), i);
Ok(i)
}
}
fn list_trees(&self) -> Result<Vec<String>> {
let mut trees = vec![];
for name in self.db.tree_names() {
let name = std::str::from_utf8(&name)
.map_err(|e| Error(format!("{}", e).into()))?
.to_string();
if name != "__sled__default" {
trees.push(name);
}
}
Ok(trees)
}
// ----
fn get(&self, tree: usize, key: &[u8]) -> Result<Option<Value>> {
let tree = self.get_tree(tree)?;
let val = tree.get(key)?;
Ok(val.map(|x| x.to_vec()))
}
fn len(&self, tree: usize) -> Result<usize> {
let tree = self.get_tree(tree)?;
Ok(tree.len())
}
fn insert(&self, tree: usize, key: &[u8], value: &[u8]) -> Result<Option<Value>> {
let tree = self.get_tree(tree)?;
let old_val = tree.insert(key, value)?;
Ok(old_val.map(|x| x.to_vec()))
}
fn remove(&self, tree: usize, key: &[u8]) -> Result<Option<Value>> {
let tree = self.get_tree(tree)?;
let old_val = tree.remove(key)?;
Ok(old_val.map(|x| x.to_vec()))
}
fn iter(&self, tree: usize) -> Result<ValueIter<'_>> {
let tree = self.get_tree(tree)?;
Ok(Box::new(tree.iter().map(|v| {
v.map(|(x, y)| (x.to_vec(), y.to_vec())).map_err(Into::into)
})))
}
fn iter_rev(&self, tree: usize) -> Result<ValueIter<'_>> {
let tree = self.get_tree(tree)?;
Ok(Box::new(tree.iter().rev().map(|v| {
v.map(|(x, y)| (x.to_vec(), y.to_vec())).map_err(Into::into)
})))
}
fn range<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> Result<ValueIter<'_>> {
let tree = self.get_tree(tree)?;
Ok(Box::new(tree.range::<&'r [u8], _>((low, high)).map(|v| {
v.map(|(x, y)| (x.to_vec(), y.to_vec())).map_err(Into::into)
})))
}
fn range_rev<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> Result<ValueIter<'_>> {
let tree = self.get_tree(tree)?;
Ok(Box::new(tree.range::<&'r [u8], _>((low, high)).rev().map(
|v| v.map(|(x, y)| (x.to_vec(), y.to_vec())).map_err(Into::into),
)))
}
// ----
fn transaction(&self, f: &dyn ITxFn) -> TxResult<(), ()> {
let trees = self.trees.read().unwrap();
let res = trees.0.transaction(|txtrees| {
let mut tx = SledTx {
trees: txtrees,
err: Cell::new(None),
};
match f.try_on(&mut tx) {
TxFnResult::Ok => {
assert!(tx.err.into_inner().is_none());
Ok(())
}
TxFnResult::Abort => {
assert!(tx.err.into_inner().is_none());
Err(ConflictableTransactionError::Abort(()))
}
TxFnResult::DbErr => {
let e = tx.err.into_inner().expect("No DB error");
Err(e.into())
}
}
});
match res {
Ok(()) => Ok(()),
Err(TransactionError::Abort(())) => Err(TxError::Abort(())),
Err(TransactionError::Storage(s)) => Err(TxError::Db(s.into())),
}
}
}
// ----
struct SledTx<'a> {
trees: &'a [TransactionalTree],
err: Cell<Option<UnabortableTransactionError>>,
}
impl<'a> SledTx<'a> {
fn get_tree(&self, i: usize) -> TxOpResult<&TransactionalTree> {
self.trees.get(i).ok_or_else(|| {
TxOpError(Error(
"invalid tree id (it might have been openned after the transaction started)".into(),
))
})
}
fn save_error<R>(
&self,
v: std::result::Result<R, UnabortableTransactionError>,
) -> TxOpResult<R> {
match v {
Ok(x) => Ok(x),
Err(e) => {
let txt = format!("{}", e);
self.err.set(Some(e));
Err(TxOpError(Error(txt.into())))
}
}
}
}
impl<'a> ITx for SledTx<'a> {
fn get(&self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>> {
let tree = self.get_tree(tree)?;
let tmp = self.save_error(tree.get(key))?;
Ok(tmp.map(|x| x.to_vec()))
}
fn len(&self, _tree: usize) -> TxOpResult<usize> {
unimplemented!(".len() in transaction not supported with Sled backend")
}
fn insert(&mut self, tree: usize, key: &[u8], value: &[u8]) -> TxOpResult<Option<Value>> {
let tree = self.get_tree(tree)?;
let old_val = self.save_error(tree.insert(key, value))?;
Ok(old_val.map(|x| x.to_vec()))
}
fn remove(&mut self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>> {
let tree = self.get_tree(tree)?;
let old_val = self.save_error(tree.remove(key))?;
Ok(old_val.map(|x| x.to_vec()))
}
fn iter(&self, _tree: usize) -> TxOpResult<TxValueIter<'_>> {
unimplemented!("Iterators in transactions not supported with Sled backend");
}
fn iter_rev(&self, _tree: usize) -> TxOpResult<TxValueIter<'_>> {
unimplemented!("Iterators in transactions not supported with Sled backend");
}
fn range<'r>(
&self,
_tree: usize,
_low: Bound<&'r [u8]>,
_high: Bound<&'r [u8]>,
) -> TxOpResult<TxValueIter<'_>> {
unimplemented!("Iterators in transactions not supported with Sled backend");
}
fn range_rev<'r>(
&self,
_tree: usize,
_low: Bound<&'r [u8]>,
_high: Bound<&'r [u8]>,
) -> TxOpResult<TxValueIter<'_>> {
unimplemented!("Iterators in transactions not supported with Sled backend");
}
}

500
src/db/sqlite_adapter.rs Normal file
View file

@ -0,0 +1,500 @@
use core::ops::Bound;
use std::borrow::BorrowMut;
use std::marker::PhantomPinned;
use std::pin::Pin;
use std::ptr::NonNull;
use std::sync::{Arc, Mutex, MutexGuard};
use log::trace;
use rusqlite::{params, Connection, Rows, Statement, Transaction};
use crate::{
Db, Error, IDb, ITx, ITxFn, Result, TxError, TxFnResult, TxOpError, TxOpResult, TxResult,
TxValueIter, Value, ValueIter,
};
pub use rusqlite;
// --- err
impl From<rusqlite::Error> for Error {
fn from(e: rusqlite::Error) -> Error {
Error(format!("Sqlite: {}", e).into())
}
}
impl From<rusqlite::Error> for TxOpError {
fn from(e: rusqlite::Error) -> TxOpError {
TxOpError(e.into())
}
}
// -- db
pub struct SqliteDb(Mutex<SqliteDbInner>);
struct SqliteDbInner {
db: Connection,
trees: Vec<String>,
}
impl SqliteDb {
pub fn init(db: rusqlite::Connection) -> Db {
let s = Self(Mutex::new(SqliteDbInner {
db,
trees: Vec::new(),
}));
Db(Arc::new(s))
}
}
impl SqliteDbInner {
fn get_tree(&self, i: usize) -> Result<&'_ str> {
self.trees
.get(i)
.map(String::as_str)
.ok_or_else(|| Error("invalid tree id".into()))
}
fn internal_get(&self, tree: &str, key: &[u8]) -> Result<Option<Value>> {
let mut stmt = self
.db
.prepare(&format!("SELECT v FROM {} WHERE k = ?1", tree))?;
let mut res_iter = stmt.query([key])?;
match res_iter.next()? {
None => Ok(None),
Some(v) => Ok(Some(v.get::<_, Vec<u8>>(0)?)),
}
}
}
impl IDb for SqliteDb {
fn engine(&self) -> String {
format!("sqlite3 v{} (using rusqlite crate)", rusqlite::version())
}
fn open_tree(&self, name: &str) -> Result<usize> {
let name = format!("tree_{}", name.replace(':', "_COLON_"));
let mut this = self.0.lock().unwrap();
if let Some(i) = this.trees.iter().position(|x| x == &name) {
Ok(i)
} else {
trace!("create table {}", name);
this.db.execute(
&format!(
"CREATE TABLE IF NOT EXISTS {} (
k BLOB PRIMARY KEY,
v BLOB
)",
name
),
[],
)?;
trace!("table created: {}, unlocking", name);
let i = this.trees.len();
this.trees.push(name.to_string());
Ok(i)
}
}
fn list_trees(&self) -> Result<Vec<String>> {
let mut trees = vec![];
trace!("list_trees: lock db");
let this = self.0.lock().unwrap();
trace!("list_trees: lock acquired");
let mut stmt = this.db.prepare(
"SELECT name FROM sqlite_schema WHERE type = 'table' AND name LIKE 'tree_%'",
)?;
let mut rows = stmt.query([])?;
while let Some(row) = rows.next()? {
let name = row.get::<_, String>(0)?;
let name = name.replace("_COLON_", ":");
let name = name.strip_prefix("tree_").unwrap().to_string();
trees.push(name);
}
Ok(trees)
}
// ----
fn get(&self, tree: usize, key: &[u8]) -> Result<Option<Value>> {
trace!("get {}: lock db", tree);
let this = self.0.lock().unwrap();
trace!("get {}: lock acquired", tree);
let tree = this.get_tree(tree)?;
this.internal_get(tree, key)
}
fn len(&self, tree: usize) -> Result<usize> {
trace!("len {}: lock db", tree);
let this = self.0.lock().unwrap();
trace!("len {}: lock acquired", tree);
let tree = this.get_tree(tree)?;
let mut stmt = this.db.prepare(&format!("SELECT COUNT(*) FROM {}", tree))?;
let mut res_iter = stmt.query([])?;
match res_iter.next()? {
None => Ok(0),
Some(v) => Ok(v.get::<_, usize>(0)?),
}
}
fn insert(&self, tree: usize, key: &[u8], value: &[u8]) -> Result<Option<Value>> {
trace!("insert {}: lock db", tree);
let this = self.0.lock().unwrap();
trace!("insert {}: lock acquired", tree);
let tree = this.get_tree(tree)?;
let old_val = this.internal_get(tree, key)?;
let sql = match &old_val {
Some(_) => format!("UPDATE {} SET v = ?2 WHERE k = ?1", tree),
None => format!("INSERT INTO {} (k, v) VALUES (?1, ?2)", tree),
};
let n = this.db.execute(&sql, params![key, value])?;
assert_eq!(n, 1);
Ok(old_val)
}
fn remove(&self, tree: usize, key: &[u8]) -> Result<Option<Value>> {
trace!("remove {}: lock db", tree);
let this = self.0.lock().unwrap();
trace!("remove {}: lock acquired", tree);
let tree = this.get_tree(tree)?;
let old_val = this.internal_get(tree, key)?;
if old_val.is_some() {
let n = this
.db
.execute(&format!("DELETE FROM {} WHERE k = ?1", tree), params![key])?;
assert_eq!(n, 1);
}
Ok(old_val)
}
fn iter(&self, tree: usize) -> Result<ValueIter<'_>> {
trace!("iter {}: lock db", tree);
let this = self.0.lock().unwrap();
trace!("iter {}: lock acquired", tree);
let tree = this.get_tree(tree)?;
let sql = format!("SELECT k, v FROM {} ORDER BY k ASC", tree);
DbValueIterator::make(this, &sql, [])
}
fn iter_rev(&self, tree: usize) -> Result<ValueIter<'_>> {
trace!("iter_rev {}: lock db", tree);
let this = self.0.lock().unwrap();
trace!("iter_rev {}: lock acquired", tree);
let tree = this.get_tree(tree)?;
let sql = format!("SELECT k, v FROM {} ORDER BY k DESC", tree);
DbValueIterator::make(this, &sql, [])
}
fn range<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> Result<ValueIter<'_>> {
trace!("range {}: lock db", tree);
let this = self.0.lock().unwrap();
trace!("range {}: lock acquired", tree);
let tree = this.get_tree(tree)?;
let (bounds_sql, params) = bounds_sql(low, high);
let sql = format!("SELECT k, v FROM {} {} ORDER BY k ASC", tree, bounds_sql);
let params = params
.iter()
.map(|x| x as &dyn rusqlite::ToSql)
.collect::<Vec<_>>();
DbValueIterator::make::<&[&dyn rusqlite::ToSql]>(this, &sql, params.as_ref())
}
fn range_rev<'r>(
&self,
tree: usize,
low: Bound<&'r [u8]>,
high: Bound<&'r [u8]>,
) -> Result<ValueIter<'_>> {
trace!("range_rev {}: lock db", tree);
let this = self.0.lock().unwrap();
trace!("range_rev {}: lock acquired", tree);
let tree = this.get_tree(tree)?;
let (bounds_sql, params) = bounds_sql(low, high);
let sql = format!("SELECT k, v FROM {} {} ORDER BY k DESC", tree, bounds_sql);
let params = params
.iter()
.map(|x| x as &dyn rusqlite::ToSql)
.collect::<Vec<_>>();
DbValueIterator::make::<&[&dyn rusqlite::ToSql]>(this, &sql, params.as_ref())
}
// ----
fn transaction(&self, f: &dyn ITxFn) -> TxResult<(), ()> {
trace!("transaction: lock db");
let mut this = self.0.lock().unwrap();
trace!("transaction: lock acquired");
let this_mut_ref: &mut SqliteDbInner = this.borrow_mut();
let mut tx = SqliteTx {
tx: this_mut_ref
.db
.transaction()
.map_err(Error::from)
.map_err(TxError::Db)?,
trees: &this_mut_ref.trees,
};
let res = match f.try_on(&mut tx) {
TxFnResult::Ok => {
tx.tx.commit().map_err(Error::from).map_err(TxError::Db)?;
Ok(())
}
TxFnResult::Abort => {
tx.tx.rollback().map_err(Error::from).map_err(TxError::Db)?;
Err(TxError::Abort(()))
}
TxFnResult::DbErr => {
tx.tx.rollback().map_err(Error::from).map_err(TxError::Db)?;
Err(TxError::Db(Error(
"(this message will be discarded)".into(),
)))
}
};
trace!("transaction done");
res
}
}
// ----
struct SqliteTx<'a> {
tx: Transaction<'a>,
trees: &'a [String],
}
impl<'a> SqliteTx<'a> {
fn get_tree(&self, i: usize) -> TxOpResult<&'_ str> {
self.trees.get(i).map(String::as_ref).ok_or_else(|| {
TxOpError(Error(
"invalid tree id (it might have been openned after the transaction started)".into(),
))
})
}
fn internal_get(&self, tree: &str, key: &[u8]) -> TxOpResult<Option<Value>> {
let mut stmt = self
.tx
.prepare(&format!("SELECT v FROM {} WHERE k = ?1", tree))?;
let mut res_iter = stmt.query([key])?;
match res_iter.next()? {
None => Ok(None),
Some(v) => Ok(Some(v.get::<_, Vec<u8>>(0)?)),
}
}
}
impl<'a> ITx for SqliteTx<'a> {
fn get(&self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>> {
let tree = self.get_tree(tree)?;
self.internal_get(tree, key)
}
fn len(&self, tree: usize) -> TxOpResult<usize> {
let tree = self.get_tree(tree)?;
let mut stmt = self.tx.prepare(&format!("SELECT COUNT(*) FROM {}", tree))?;
let mut res_iter = stmt.query([])?;
match res_iter.next()? {
None => Ok(0),
Some(v) => Ok(v.get::<_, usize>(0)?),
}
}
fn insert(&mut self, tree: usize, key: &[u8], value: &[u8]) -> TxOpResult<Option<Value>> {
let tree = self.get_tree(tree)?;
let old_val = self.internal_get(tree, key)?;
let sql = match &old_val {
Some(_) => format!("UPDATE {} SET v = ?2 WHERE k = ?1", tree),
None => format!("INSERT INTO {} (k, v) VALUES (?1, ?2)", tree),
};
let n = self.tx.execute(&sql, params![key, value])?;
assert_eq!(n, 1);
Ok(old_val)
}
fn remove(&mut self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>> {
let tree = self.get_tree(tree)?;
let old_val = self.internal_get(tree, key)?;
if old_val.is_some() {
let n = self
.tx
.execute(&format!("DELETE FROM {} WHERE k = ?1", tree), params![key])?;
assert_eq!(n, 1);
}
Ok(old_val)
}
fn iter(&self, _tree: usize) -> TxOpResult<TxValueIter<'_>> {
unimplemented!();
}
fn iter_rev(&self, _tree: usize) -> TxOpResult<TxValueIter<'_>> {
unimplemented!();
}
fn range<'r>(
&self,
_tree: usize,
_low: Bound<&'r [u8]>,
_high: Bound<&'r [u8]>,
) -> TxOpResult<TxValueIter<'_>> {
unimplemented!();
}
fn range_rev<'r>(
&self,
_tree: usize,
_low: Bound<&'r [u8]>,
_high: Bound<&'r [u8]>,
) -> TxOpResult<TxValueIter<'_>> {
unimplemented!();
}
}
// ----
struct DbValueIterator<'a> {
db: MutexGuard<'a, SqliteDbInner>,
stmt: Option<Statement<'a>>,
iter: Option<Rows<'a>>,
_pin: PhantomPinned,
}
impl<'a> DbValueIterator<'a> {
fn make<P: rusqlite::Params>(
db: MutexGuard<'a, SqliteDbInner>,
sql: &str,
args: P,
) -> Result<ValueIter<'a>> {
let res = DbValueIterator {
db,
stmt: None,
iter: None,
_pin: PhantomPinned,
};
let mut boxed = Box::pin(res);
trace!("make iterator with sql: {}", sql);
unsafe {
let db = NonNull::from(&boxed.db);
let stmt = db.as_ref().db.prepare(sql)?;
let mut_ref: Pin<&mut DbValueIterator<'a>> = Pin::as_mut(&mut boxed);
Pin::get_unchecked_mut(mut_ref).stmt = Some(stmt);
let mut stmt = NonNull::from(&boxed.stmt);
let iter = stmt.as_mut().as_mut().unwrap().query(args)?;
let mut_ref: Pin<&mut DbValueIterator<'a>> = Pin::as_mut(&mut boxed);
Pin::get_unchecked_mut(mut_ref).iter = Some(iter);
}
Ok(Box::new(DbValueIteratorPin(boxed)))
}
}
impl<'a> Drop for DbValueIterator<'a> {
fn drop(&mut self) {
trace!("drop iter");
drop(self.iter.take());
drop(self.stmt.take());
}
}
struct DbValueIteratorPin<'a>(Pin<Box<DbValueIterator<'a>>>);
impl<'a> Iterator for DbValueIteratorPin<'a> {
type Item = Result<(Value, Value)>;
fn next(&mut self) -> Option<Self::Item> {
let next = unsafe {
let mut_ref: Pin<&mut DbValueIterator<'a>> = Pin::as_mut(&mut self.0);
Pin::get_unchecked_mut(mut_ref).iter.as_mut()?.next()
};
let row = match next {
Err(e) => return Some(Err(e.into())),
Ok(None) => return None,
Ok(Some(r)) => r,
};
let k = match row.get::<_, Vec<u8>>(0) {
Err(e) => return Some(Err(e.into())),
Ok(x) => x,
};
let v = match row.get::<_, Vec<u8>>(1) {
Err(e) => return Some(Err(e.into())),
Ok(y) => y,
};
Some(Ok((k, v)))
}
}
// ----
fn bounds_sql<'r>(low: Bound<&'r [u8]>, high: Bound<&'r [u8]>) -> (String, Vec<Vec<u8>>) {
let mut sql = String::new();
let mut params: Vec<Vec<u8>> = vec![];
match low {
Bound::Included(b) => {
sql.push_str(" WHERE k >= ?1");
params.push(b.to_vec());
}
Bound::Excluded(b) => {
sql.push_str(" WHERE k > ?1");
params.push(b.to_vec());
}
Bound::Unbounded => (),
};
match high {
Bound::Included(b) => {
if !params.is_empty() {
sql.push_str(" AND k <= ?2");
} else {
sql.push_str(" WHERE k <= ?1");
}
params.push(b.to_vec());
}
Bound::Excluded(b) => {
if !params.is_empty() {
sql.push_str(" AND k < ?2");
} else {
sql.push_str(" WHERE k < ?1");
}
params.push(b.to_vec());
}
Bound::Unbounded => (),
}
(sql, params)
}

106
src/db/test.rs Normal file
View file

@ -0,0 +1,106 @@
use crate::*;
use crate::lmdb_adapter::LmdbDb;
use crate::sled_adapter::SledDb;
use crate::sqlite_adapter::SqliteDb;
fn test_suite(db: Db) {
let tree = db.open_tree("tree").unwrap();
let ka: &[u8] = &b"test"[..];
let kb: &[u8] = &b"zwello"[..];
let kint: &[u8] = &b"tz"[..];
let va: &[u8] = &b"plop"[..];
let vb: &[u8] = &b"plip"[..];
let vc: &[u8] = &b"plup"[..];
assert!(tree.insert(ka, va).unwrap().is_none());
assert_eq!(tree.get(ka).unwrap().unwrap(), va);
let res = db.transaction::<_, (), _>(|mut tx| {
assert_eq!(tx.get(&tree, ka).unwrap().unwrap(), va);
assert_eq!(tx.insert(&tree, ka, vb).unwrap().unwrap(), va);
assert_eq!(tx.get(&tree, ka).unwrap().unwrap(), vb);
tx.commit(12)
});
assert!(matches!(res, Ok(12)));
assert_eq!(tree.get(ka).unwrap().unwrap(), vb);
let res = db.transaction::<(), _, _>(|mut tx| {
assert_eq!(tx.get(&tree, ka).unwrap().unwrap(), vb);
assert_eq!(tx.insert(&tree, ka, vc).unwrap().unwrap(), vb);
assert_eq!(tx.get(&tree, ka).unwrap().unwrap(), vc);
tx.abort(42)
});
assert!(matches!(res, Err(TxError::Abort(42))));
assert_eq!(tree.get(ka).unwrap().unwrap(), vb);
let mut iter = tree.iter().unwrap();
let next = iter.next().unwrap().unwrap();
assert_eq!((next.0.as_ref(), next.1.as_ref()), (ka, vb));
assert!(iter.next().is_none());
drop(iter);
assert!(tree.insert(kb, vc).unwrap().is_none());
assert_eq!(tree.get(kb).unwrap().unwrap(), vc);
let mut iter = tree.iter().unwrap();
let next = iter.next().unwrap().unwrap();
assert_eq!((next.0.as_ref(), next.1.as_ref()), (ka, vb));
let next = iter.next().unwrap().unwrap();
assert_eq!((next.0.as_ref(), next.1.as_ref()), (kb, vc));
assert!(iter.next().is_none());
drop(iter);
let mut iter = tree.range(kint..).unwrap();
let next = iter.next().unwrap().unwrap();
assert_eq!((next.0.as_ref(), next.1.as_ref()), (kb, vc));
assert!(iter.next().is_none());
drop(iter);
let mut iter = tree.range_rev(..kint).unwrap();
let next = iter.next().unwrap().unwrap();
assert_eq!((next.0.as_ref(), next.1.as_ref()), (ka, vb));
assert!(iter.next().is_none());
drop(iter);
let mut iter = tree.iter_rev().unwrap();
let next = iter.next().unwrap().unwrap();
assert_eq!((next.0.as_ref(), next.1.as_ref()), (kb, vc));
let next = iter.next().unwrap().unwrap();
assert_eq!((next.0.as_ref(), next.1.as_ref()), (ka, vb));
assert!(iter.next().is_none());
drop(iter);
}
#[test]
fn test_lmdb_db() {
let path = mktemp::Temp::new_dir().unwrap();
let db = heed::EnvOpenOptions::new()
.max_dbs(100)
.open(&path)
.unwrap();
let db = LmdbDb::init(db);
test_suite(db);
drop(path);
}
#[test]
fn test_sled_db() {
let path = mktemp::Temp::new_dir().unwrap();
let db = SledDb::init(sled::open(path.to_path_buf()).unwrap());
test_suite(db);
drop(path);
}
#[test]
fn test_sqlite_db() {
let db = SqliteDb::init(rusqlite::Connection::open_in_memory().unwrap());
test_suite(db);
}

3
src/garage/Cargo.toml
View file

@ -21,6 +21,7 @@ path = "tests/lib.rs"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
garage_db = { version = "0.8.0", path = "../db" }
garage_api = { version = "0.7.0", path = "../api" }
garage_model = { version = "0.7.0", path = "../model" }
garage_rpc = { version = "0.7.0", path = "../rpc" }
@ -36,8 +37,6 @@ rand = "0.8"
async-trait = "0.1.7"
sodiumoxide = { version = "0.2.5-0", package = "kuska-sodiumoxide" }
sled = "0.34"
rmp-serde = "0.15"
serde = { version = "1.0", default-features = false, features = ["derive", "rc"] }
serde_bytes = "0.11"

45
src/garage/admin.rs
View file

@ -660,11 +660,11 @@ impl AdminRpcHandler {
}
Ok(AdminRpc::Ok(ret))
} else {
Ok(AdminRpc::Ok(self.gather_stats_local(opt)))
Ok(AdminRpc::Ok(self.gather_stats_local(opt)?))
}
}
fn gather_stats_local(&self, opt: StatsOpt) -> String {
fn gather_stats_local(&self, opt: StatsOpt) -> Result<String, Error> {
let mut ret = String::new();
writeln!(
&mut ret,
@ -672,6 +672,7 @@ impl AdminRpcHandler {
self.garage.system.garage_version(),
)
.unwrap();
writeln!(&mut ret, "\nDatabase engine: {}", self.garage.db.engine()).unwrap();
// Gather ring statistics
let ring = self.garage.system.ring.borrow().clone();
@ -689,59 +690,71 @@ impl AdminRpcHandler {
writeln!(&mut ret, " {:?} {}", n, c).unwrap();
}
self.gather_table_stats(&mut ret, &self.garage.bucket_table, &opt);
self.gather_table_stats(&mut ret, &self.garage.key_table, &opt);
self.gather_table_stats(&mut ret, &self.garage.object_table, &opt);
self.gather_table_stats(&mut ret, &self.garage.version_table, &opt);
self.gather_table_stats(&mut ret, &self.garage.block_ref_table, &opt);
self.gather_table_stats(&mut ret, &self.garage.bucket_table, &opt)?;
self.gather_table_stats(&mut ret, &self.garage.key_table, &opt)?;
self.gather_table_stats(&mut ret, &self.garage.object_table, &opt)?;
self.gather_table_stats(&mut ret, &self.garage.version_table, &opt)?;
self.gather_table_stats(&mut ret, &self.garage.block_ref_table, &opt)?;
writeln!(&mut ret, "\nBlock manager stats:").unwrap();
if opt.detailed {
writeln!(
&mut ret,
" number of RC entries (~= number of blocks): {}",
self.garage.block_manager.rc_len()
self.garage.block_manager.rc_len()?
)
.unwrap();
}
writeln!(
&mut ret,
" resync queue length: {}",
self.garage.block_manager.resync_queue_len()
self.garage.block_manager.resync_queue_len()?
)
.unwrap();
writeln!(
&mut ret,
" blocks with resync errors: {}",
self.garage.block_manager.resync_errors_len()
self.garage.block_manager.resync_errors_len()?
)
.unwrap();
ret
Ok(ret)
}
fn gather_table_stats<F, R>(&self, to: &mut String, t: &Arc<Table<F, R>>, opt: &StatsOpt)
fn gather_table_stats<F, R>(
&self,
to: &mut String,
t: &Arc<Table<F, R>>,
opt: &StatsOpt,
) -> Result<(), Error>
where
F: TableSchema + 'static,
R: TableReplication + 'static,
{
writeln!(to, "\nTable stats for {}", F::TABLE_NAME).unwrap();
if opt.detailed {
writeln!(to, " number of items: {}", t.data.store.len()).unwrap();
writeln!(
to,
" number of items: {}",
t.data.store.len().map_err(GarageError::from)?
)
.unwrap();
writeln!(
to,
" Merkle tree size: {}",
t.merkle_updater.merkle_tree_len()
t.merkle_updater.merkle_tree_len()?
)
.unwrap();
}
writeln!(
to,
" Merkle updater todo queue length: {}",
t.merkle_updater.todo_len()
t.merkle_updater.todo_len()?
)
.unwrap();
writeln!(to, " GC todo queue length: {}", t.data.gc_todo_len()).unwrap();
writeln!(to, " GC todo queue length: {}", t.data.gc_todo_len()?).unwrap();
Ok(())
}
}

50
src/garage/repair.rs
View file

@ -64,13 +64,23 @@ impl Repair {
async fn repair_versions(&self, must_exit: &watch::Receiver<bool>) -> Result<(), Error> {
let mut pos = vec![];
let mut i = 0;
while let Some((item_key, item_bytes)) =
self.garage.version_table.data.store.get_gt(&pos)?
{
pos = item_key.to_vec();
while !*must_exit.borrow() {
let item_bytes = match self.garage.version_table.data.store.get_gt(pos)? {
Some((k, v)) => {
pos = k;
v
}
None => break,
};
let version = rmp_serde::decode::from_read_ref::<_, Version>(item_bytes.as_ref())?;
i += 1;
if i % 1000 == 0 {
info!("repair_versions: {}", i);
}
let version = rmp_serde::decode::from_read_ref::<_, Version>(&item_bytes)?;
if version.deleted.get() {
continue;
}
@ -98,23 +108,30 @@ impl Repair {
))
.await?;
}
if *must_exit.borrow() {
break;
}
}
info!("repair_versions: finished, done {}", i);
Ok(())
}
async fn repair_block_ref(&self, must_exit: &watch::Receiver<bool>) -> Result<(), Error> {
let mut pos = vec![];
let mut i = 0;
while let Some((item_key, item_bytes)) =
self.garage.block_ref_table.data.store.get_gt(&pos)?
{
pos = item_key.to_vec();
while !*must_exit.borrow() {
let item_bytes = match self.garage.block_ref_table.data.store.get_gt(pos)? {
Some((k, v)) => {
pos = k;
v
}
None => break,
};
let block_ref = rmp_serde::decode::from_read_ref::<_, BlockRef>(item_bytes.as_ref())?;
i += 1;
if i % 1000 == 0 {
info!("repair_block_ref: {}", i);
}
let block_ref = rmp_serde::decode::from_read_ref::<_, BlockRef>(&item_bytes)?;
if block_ref.deleted.get() {
continue;
}
@ -139,11 +156,8 @@ impl Repair {
})
.await?;
}
if *must_exit.borrow() {
break;
}
}
info!("repair_block_ref: finished, done {}", i);
Ok(())
}
}

54
src/garage/server.rs
View file

@ -2,6 +2,8 @@ use std::path::PathBuf;
use tokio::sync::watch;
use garage_db as db;
use garage_util::background::*;
use garage_util::config::*;
use garage_util::error::Error;
@ -31,13 +33,51 @@ pub async fn run_server(config_file: PathBuf) -> Result<(), Error> {
info!("Opening database...");
let mut db_path = config.metadata_dir.clone();
db_path.push("db");
let db = sled::Config::default()
.path(&db_path)
.cache_capacity(config.sled_cache_capacity)
.flush_every_ms(Some(config.sled_flush_every_ms))
.open()
.expect("Unable to open sled DB");
std::fs::create_dir_all(&db_path).expect("Unable to create Garage meta data directory");
let db = match config.db_engine.as_str() {
"sled" => {
db_path.push("db");
info!("Opening Sled database at: {}", db_path.display());
let db = db::sled_adapter::sled::Config::default()
.path(&db_path)
.cache_capacity(config.sled_cache_capacity)
.flush_every_ms(Some(config.sled_flush_every_ms))
.open()
.expect("Unable to open sled DB");
db::sled_adapter::SledDb::init(db)
}
"sqlite" | "sqlite3" | "rusqlite" => {
db_path.push("db.sqlite");
info!("Opening Sqlite database at: {}", db_path.display());
let db = db::sqlite_adapter::rusqlite::Connection::open(db_path)
.expect("Unable to open sqlite DB");
db::sqlite_adapter::SqliteDb::init(db)
}
"lmdb" | "heed" => {
db_path.push("db.lmdb");
info!("Opening LMDB database at: {}", db_path.display());
std::fs::create_dir_all(&db_path).expect("Unable to create LMDB data directory");
let map_size = if u32::MAX as usize == usize::MAX {
warn!("LMDB is not recommended on 32-bit systems, database size will be limited");
1usize << 30 // 1GB for 32-bit systems
} else {
1usize << 40 // 1TB for 64-bit systems
};
let db = db::lmdb_adapter::heed::EnvOpenOptions::new()
.max_dbs(100)
.map_size(map_size)
.open(&db_path)
.expect("Unable to open LMDB DB");
db::lmdb_adapter::LmdbDb::init(db)
}
e => {
return Err(Error::Message(format!(
"Unsupported DB engine: {} (options: sled, sqlite, lmdb)",
e
)));
}
};
info!("Initializing background runner...");
let watch_cancel = netapp::util::watch_ctrl_c();

8
src/garage/tests/bucket.rs
View file

@ -29,8 +29,7 @@ async fn test_bucket_all() {
.unwrap()
.iter()
.filter(|x| x.name.as_ref().is_some())
.find(|x| x.name.as_ref().unwrap() == "hello")
.is_some());
.any(|x| x.name.as_ref().unwrap() == "hello"));
}
{
// Get its location
@ -75,13 +74,12 @@ async fn test_bucket_all() {
{
// Check bucket is deleted with List buckets
let r = ctx.client.list_buckets().send().await.unwrap();
assert!(r
assert!(!r
.buckets
.as_ref()
.unwrap()
.iter()
.filter(|x| x.name.as_ref().is_some())
.find(|x| x.name.as_ref().unwrap() == "hello")
.is_none());
.any(|x| x.name.as_ref().unwrap() == "hello"));
}
}

3
src/model/Cargo.toml
View file

@ -14,6 +14,7 @@ path = "lib.rs"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
garage_db = { version = "0.8.0", path = "../db" }
garage_rpc = { version = "0.7.0", path = "../rpc" }
garage_table = { version = "0.7.0", path = "../table" }
garage_block = { version = "0.7.0", path = "../block" }
@ -30,8 +31,6 @@ tracing = "0.1.30"
rand = "0.8"
zstd = { version = "0.9", default-features = false }
sled = "0.34"
rmp-serde = "0.15"
serde = { version = "1.0", default-features = false, features = ["derive", "rc"] }
serde_bytes = "0.11"

8
src/model/garage.rs
View file

@ -2,6 +2,8 @@ use std::sync::Arc;
use netapp::NetworkKey;
use garage_db as db;
use garage_util::background::*;
use garage_util::config::*;
@ -33,7 +35,7 @@ pub struct Garage {
pub config: Config,
/// The local database
pub db: sled::Db,
pub db: db::Db,
/// A background job runner
pub background: Arc<BackgroundRunner>,
/// The membership manager
@ -71,7 +73,7 @@ pub struct GarageK2V {
impl Garage {
/// Create and run garage
pub fn new(config: Config, db: sled::Db, background: Arc<BackgroundRunner>) -> Arc<Self> {
pub fn new(config: Config, db: db::Db, background: Arc<BackgroundRunner>) -> Arc<Self> {
let network_key = NetworkKey::from_slice(
&hex::decode(&config.rpc_secret).expect("Invalid RPC secret key")[..],
)
@ -199,7 +201,7 @@ impl Garage {
#[cfg(feature = "k2v")]
impl GarageK2V {
fn new(system: Arc<System>, db: &sled::Db, meta_rep_param: TableShardedReplication) -> Self {
fn new(system: Arc<System>, db: &db::Db, meta_rep_param: TableShardedReplication) -> Self {
info!("Initialize K2V counter table...");
let counter_table = IndexCounter::new(system.clone(), meta_rep_param.clone(), db);
info!("Initialize K2V subscription manager...");

60
src/model/index_counter.rs
View file

@ -6,6 +6,8 @@ use std::time::Duration;
use serde::{Deserialize, Serialize};
use tokio::sync::{mpsc, watch};
use garage_db as db;
use garage_rpc::ring::Ring;
use garage_rpc::system::System;
use garage_util::data::*;
@ -114,10 +116,6 @@ impl<T: CounterSchema> TableSchema for CounterTable<T> {
type E = CounterEntry<T>;
type Filter = (DeletedFilter, Vec<Uuid>);
fn updated(&self, _old: Option<&Self::E>, _new: Option<&Self::E>) {
// nothing for now
}
fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
if filter.0 == DeletedFilter::Any {
return true;
@ -135,7 +133,7 @@ impl<T: CounterSchema> TableSchema for CounterTable<T> {
pub struct IndexCounter<T: CounterSchema> {
this_node: Uuid,
local_counter: sled::Tree,
local_counter: db::Tree,
propagate_tx: mpsc::UnboundedSender<(T::P, T::S, LocalCounterEntry)>,
pub table: Arc<Table<CounterTable<T>, TableShardedReplication>>,
}
@ -144,7 +142,7 @@ impl<T: CounterSchema> IndexCounter<T> {
pub fn new(
system: Arc<System>,
replication: TableShardedReplication,
db: &sled::Db,
db: &db::Db,
) -> Arc<Self> {
let background = system.background.clone();
@ -174,36 +172,36 @@ impl<T: CounterSchema> IndexCounter<T> {
this
}
pub fn count(&self, pk: &T::P, sk: &T::S, counts: &[(&str, i64)]) -> Result<(), Error> {
pub fn count(
&self,
tx: &mut db::Transaction,
pk: &T::P,
sk: &T::S,
counts: &[(&str, i64)],
) -> db::TxResult<(), Error> {
let tree_key = self.table.data.tree_key(pk, sk);
let new_entry = self.local_counter.transaction(|tx| {
let mut entry = match tx.get(&tree_key[..])? {
Some(old_bytes) => {
rmp_serde::decode::from_read_ref::<_, LocalCounterEntry>(&old_bytes)
.map_err(Error::RmpDecode)
.map_err(sled::transaction::ConflictableTransactionError::Abort)?
}
None => LocalCounterEntry {
values: BTreeMap::new(),
},
};
let mut entry = match tx.get(&self.local_counter, &tree_key[..])? {
Some(old_bytes) => rmp_serde::decode::from_read_ref::<_, LocalCounterEntry>(&old_bytes)
.map_err(Error::RmpDecode)
.map_err(db::TxError::Abort)?,
None => LocalCounterEntry {
values: BTreeMap::new(),
},
};
for (s, inc) in counts.iter() {
let mut ent = entry.values.entry(s.to_string()).or_insert((0, 0));
ent.0 += 1;
ent.1 += *inc;
}
for (s, inc) in counts.iter() {
let mut ent = entry.values.entry(s.to_string()).or_insert((0, 0));
ent.0 += 1;
ent.1 += *inc;
}
let new_entry_bytes = rmp_to_vec_all_named(&entry)
.map_err(Error::RmpEncode)
.map_err(sled::transaction::ConflictableTransactionError::Abort)?;
tx.insert(&tree_key[..], new_entry_bytes)?;
let new_entry_bytes = rmp_to_vec_all_named(&entry)
.map_err(Error::RmpEncode)
.map_err(db::TxError::Abort)?;
tx.insert(&self.local_counter, &tree_key[..], new_entry_bytes)?;
Ok(entry)
})?;
if let Err(e) = self.propagate_tx.send((pk.clone(), sk.clone(), new_entry)) {
if let Err(e) = self.propagate_tx.send((pk.clone(), sk.clone(), entry)) {
error!(
"Could not propagate updated counter values, failed to send to channel: {}",
e

24
src/model/k2v/item_table.rs
View file

@ -2,6 +2,7 @@ use serde::{Deserialize, Serialize};
use std::collections::BTreeMap;
use std::sync::Arc;
use garage_db as db;
use garage_util::data::*;
use garage_table::crdt::*;
@ -221,7 +222,12 @@ impl TableSchema for K2VItemTable {
type E = K2VItem;
type Filter = ItemFilter;
fn updated(&self, old: Option<&Self::E>, new: Option<&Self::E>) {
fn updated(
&self,
tx: &mut db::Transaction,
old: Option<&Self::E>,
new: Option<&Self::E>,
) -> db::TxOpResult<()> {
// 1. Count
let (old_entries, old_conflicts, old_values, old_bytes) = match old {
None => (0, 0, 0, 0),
@ -239,7 +245,8 @@ impl TableSchema for K2VItemTable {
.map(|e| &e.partition.partition_key)
.unwrap_or_else(|| &new.unwrap().partition.partition_key);
if let Err(e) = self.counter_table.count(
let counter_res = self.counter_table.count(
tx,
&count_pk,
count_sk,
&[
@ -248,14 +255,23 @@ impl TableSchema for K2VItemTable {
(VALUES, new_values - old_values),
(BYTES, new_bytes - old_bytes),
],
) {
error!("Could not update K2V counter for bucket {:?} partition {}; counts will now be inconsistent. {}", count_pk, count_sk, e);
);
if let Err(e) = db::unabort(counter_res)? {
// This result can be returned by `counter_table.count()` for instance
// if messagepack serialization or deserialization fails at some step.
// Warn admin but ignore this error for now, that's all we can do.
error!(
"Unable to update K2V item counter for bucket {:?} partition {}: {}. Index values will be wrong!",
count_pk, count_sk, e
);
}
// 2. Notify
if let Some(new_ent) = new {
self.subscriptions.notify(new_ent);
}
Ok(())
}
#[allow(clippy::nonminimal_bool)]

6
src/model/migrate.rs
View file

@ -25,11 +25,15 @@ impl Migrate {
.open_tree("bucket:table")
.map_err(GarageError::from)?;
for res in tree.iter() {
let mut old_buckets = vec![];
for res in tree.iter().map_err(GarageError::from)? {
let (_k, v) = res.map_err(GarageError::from)?;
let bucket = rmp_serde::decode::from_read_ref::<_, old_bucket::Bucket>(&v[..])
.map_err(GarageError::from)?;
old_buckets.push(bucket);
}
for bucket in old_buckets {
if let old_bucket::BucketState::Present(p) = bucket.state.get() {
self.migrate_buckets050_do_bucket(&bucket, p).await?;
}

21
src/model/s3/block_ref_table.rs
View file

@ -1,6 +1,8 @@
use serde::{Deserialize, Serialize};
use std::sync::Arc;
use garage_db as db;
use garage_util::data::*;
use garage_table::crdt::Crdt;
@ -51,21 +53,22 @@ impl TableSchema for BlockRefTable {
type E = BlockRef;
type Filter = DeletedFilter;
fn updated(&self, old: Option<&Self::E>, new: Option<&Self::E>) {
#[allow(clippy::or_fun_call)]
let block = &old.or(new).unwrap().block;
fn updated(
&self,
tx: &mut db::Transaction,
old: Option<&Self::E>,
new: Option<&Self::E>,
) -> db::TxOpResult<()> {
let block = old.or(new).unwrap().block;
let was_before = old.map(|x| !x.deleted.get()).unwrap_or(false);
let is_after = new.map(|x| !x.deleted.get()).unwrap_or(false);
if is_after && !was_before {
if let Err(e) = self.block_manager.block_incref(block) {
warn!("block_incref failed for block {:?}: {}", block, e);
}
self.block_manager.block_incref(tx, block)?;
}
if was_before && !is_after {
if let Err(e) = self.block_manager.block_decref(block) {
warn!("block_decref failed for block {:?}: {}", block, e);
}
self.block_manager.block_decref(tx, block)?;
}
Ok(())
}
fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {

12
src/model/s3/object_table.rs
View file

@ -2,6 +2,8 @@ use serde::{Deserialize, Serialize};
use std::collections::BTreeMap;
use std::sync::Arc;
use garage_db as db;
use garage_util::background::BackgroundRunner;
use garage_util::data::*;
@ -232,7 +234,12 @@ impl TableSchema for ObjectTable {
type E = Object;
type Filter = ObjectFilter;
fn updated(&self, old: Option<&Self::E>, new: Option<&Self::E>) {
fn updated(
&self,
_tx: &mut db::Transaction,
old: Option<&Self::E>,
new: Option<&Self::E>,
) -> db::TxOpResult<()> {
let version_table = self.version_table.clone();
let old = old.cloned();
let new = new.cloned();
@ -259,7 +266,8 @@ impl TableSchema for ObjectTable {
}
}
Ok(())
})
});
Ok(())
}
fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {

13
src/model/s3/version_table.rs
View file

@ -1,6 +1,8 @@
use serde::{Deserialize, Serialize};
use std::sync::Arc;
use garage_db as db;
use garage_util::background::BackgroundRunner;
use garage_util::data::*;
@ -137,7 +139,12 @@ impl TableSchema for VersionTable {
type E = Version;
type Filter = DeletedFilter;
fn updated(&self, old: Option<&Self::E>, new: Option<&Self::E>) {
fn updated(
&self,
_tx: &mut db::Transaction,
old: Option<&Self::E>,
new: Option<&Self::E>,
) -> db::TxOpResult<()> {
let block_ref_table = self.block_ref_table.clone();
let old = old.cloned();
let new = new.cloned();
@ -160,7 +167,9 @@ impl TableSchema for VersionTable {
}
}
Ok(())
})
});
Ok(())
}
fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {

3
src/table/Cargo.toml
View file

@ -14,6 +14,7 @@ path = "lib.rs"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
garage_db = { version = "0.8.0", path = "../db" }
garage_rpc = { version = "0.7.0", path = "../rpc" }
garage_util = { version = "0.7.0", path = "../util" }
@ -25,8 +26,6 @@ hexdump = "0.1"
tracing = "0.1.30"
rand = "0.8"
sled = "0.34"
rmp-serde = "0.15"
serde = { version = "1.0", default-features = false, features = ["derive", "rc"] }
serde_bytes = "0.11"

115
src/table/data.rs
View file

@ -3,12 +3,13 @@ use std::convert::TryInto;
use std::sync::Arc;
use serde_bytes::ByteBuf;
use sled::{IVec, Transactional};
use tokio::sync::Notify;
use garage_db as db;
use garage_db::counted_tree_hack::CountedTree;
use garage_util::data::*;
use garage_util::error::*;
use garage_util::sled_counter::SledCountedTree;
use garage_rpc::system::System;
@ -25,12 +26,12 @@ pub struct TableData<F: TableSchema, R: TableReplication> {
pub instance: F,
pub replication: R,
pub store: sled::Tree,
pub store: db::Tree,
pub(crate) merkle_tree: sled::Tree,
pub(crate) merkle_todo: sled::Tree,
pub(crate) merkle_tree: db::Tree,
pub(crate) merkle_todo: db::Tree,
pub(crate) merkle_todo_notify: Notify,
pub(crate) gc_todo: SledCountedTree,
pub(crate) gc_todo: CountedTree,
pub(crate) metrics: TableMetrics,
}
@ -40,7 +41,7 @@ where
F: TableSchema,
R: TableReplication,
{
pub fn new(system: Arc<System>, instance: F, replication: R, db: &sled::Db) -> Arc<Self> {
pub fn new(system: Arc<System>, instance: F, replication: R, db: &db::Db) -> Arc<Self> {
let store = db
.open_tree(&format!("{}:table", F::TABLE_NAME))
.expect("Unable to open DB tree");
@ -55,7 +56,7 @@ where
let gc_todo = db
.open_tree(&format!("{}:gc_todo_v2", F::TABLE_NAME))
.expect("Unable to open DB tree");
let gc_todo = SledCountedTree::new(gc_todo);
let gc_todo = CountedTree::new(gc_todo).expect("Cannot count gc_todo_v2");
let metrics = TableMetrics::new(F::TABLE_NAME, merkle_todo.clone(), gc_todo.clone());
@ -98,30 +99,30 @@ where
None => partition_hash.to_vec(),
Some(sk) => self.tree_key(partition_key, sk),
};
let range = self.store.range(first_key..);
let range = self.store.range(first_key..)?;
self.read_range_aux(partition_hash, range, filter, limit)
}
EnumerationOrder::Reverse => match start {
Some(sk) => {
let last_key = self.tree_key(partition_key, sk);
let range = self.store.range(..=last_key).rev();
let range = self.store.range_rev(..=last_key)?;
self.read_range_aux(partition_hash, range, filter, limit)
}
None => {
let mut last_key = partition_hash.to_vec();
let lower = u128::from_be_bytes(last_key[16..32].try_into().unwrap());
last_key[16..32].copy_from_slice(&u128::to_be_bytes(lower + 1));
let range = self.store.range(..last_key).rev();
let range = self.store.range_rev(..last_key)?;
self.read_range_aux(partition_hash, range, filter, limit)
}
},
}
}
fn read_range_aux(
fn read_range_aux<'a>(
&self,
partition_hash: Hash,
range: impl Iterator<Item = sled::Result<(IVec, IVec)>>,
range: db::ValueIter<'a>,
filter: &Option<F::Filter>,
limit: usize,
) -> Result<Vec<Arc<ByteBuf>>, Error> {
@ -139,7 +140,7 @@ where
}
};
if keep {
ret.push(Arc::new(ByteBuf::from(value.as_ref())));
ret.push(Arc::new(ByteBuf::from(value)));
}
if ret.len() >= limit {
break;
@ -183,12 +184,10 @@ where
tree_key: &[u8],
f: impl Fn(Option<F::E>) -> F::E,
) -> Result<Option<F::E>, Error> {
let changed = (&self.store, &self.merkle_todo).transaction(|(store, mkl_todo)| {
let (old_entry, old_bytes, new_entry) = match store.get(tree_key)? {
let changed = self.store.db().transaction(|mut tx| {
let (old_entry, old_bytes, new_entry) = match tx.get(&self.store, tree_key)? {
Some(old_bytes) => {
let old_entry = self
.decode_entry(&old_bytes)
.map_err(sled::transaction::ConflictableTransactionError::Abort)?;
let old_entry = self.decode_entry(&old_bytes).map_err(db::TxError::Abort)?;
let new_entry = f(Some(old_entry.clone()));
(Some(old_entry), Some(old_bytes), new_entry)
}
@ -204,24 +203,28 @@ where
// the associated Merkle tree entry.
let new_bytes = rmp_to_vec_all_named(&new_entry)
.map_err(Error::RmpEncode)
.map_err(sled::transaction::ConflictableTransactionError::Abort)?;
.map_err(db::TxError::Abort)?;
let encoding_changed = Some(&new_bytes[..]) != old_bytes.as_ref().map(|x| &x[..]);
drop(old_bytes);
if value_changed || encoding_changed {
let new_bytes_hash = blake2sum(&new_bytes[..]);
mkl_todo.insert(tree_key.to_vec(), new_bytes_hash.as_slice())?;
store.insert(tree_key.to_vec(), new_bytes)?;
Ok(Some((old_entry, new_entry, new_bytes_hash)))
tx.insert(&self.merkle_todo, tree_key, new_bytes_hash.as_slice())?;
tx.insert(&self.store, tree_key, new_bytes)?;
self.instance
.updated(&mut tx, old_entry.as_ref(), Some(&new_entry))?;
Ok(Some((new_entry, new_bytes_hash)))
} else {
Ok(None)
}
})?;
if let Some((old_entry, new_entry, new_bytes_hash)) = changed {
if let Some((new_entry, new_bytes_hash)) = changed {
self.metrics.internal_update_counter.add(1);
let is_tombstone = new_entry.is_tombstone();
self.instance.updated(old_entry.as_ref(), Some(&new_entry));
self.merkle_todo_notify.notify_one();
if is_tombstone {
// We are only responsible for GC'ing this item if we are the
@ -244,22 +247,23 @@ where
}
pub(crate) fn delete_if_equal(self: &Arc<Self>, k: &[u8], v: &[u8]) -> Result<bool, Error> {
let removed = (&self.store, &self.merkle_todo).transaction(|(store, mkl_todo)| {
if let Some(cur_v) = store.get(k)? {
if cur_v == v {
store.remove(k)?;
mkl_todo.insert(k, vec![])?;
return Ok(true);
let removed = self
.store
.db()
.transaction(|mut tx| match tx.get(&self.store, k)? {
Some(cur_v) if cur_v == v => {
tx.remove(&self.store, k)?;
tx.insert(&self.merkle_todo, k, vec![])?;
let old_entry = self.decode_entry(v).map_err(db::TxError::Abort)?;
self.instance.updated(&mut tx, Some(&old_entry), None)?;
Ok(true)
}
}
Ok(false)
})?;
_ => Ok(false),
})?;
if removed {
self.metrics.internal_delete_counter.add(1);
let old_entry = self.decode_entry(v)?;
self.instance.updated(Some(&old_entry), None);
self.merkle_todo_notify.notify_one();
}
Ok(removed)
@ -270,25 +274,26 @@ where
k: &[u8],
vhash: Hash,
) -> Result<bool, Error> {
let removed = (&self.store, &self.merkle_todo).transaction(|(store, mkl_todo)| {
if let Some(cur_v) = store.get(k)? {
if blake2sum(&cur_v[..]) == vhash {
store.remove(k)?;
mkl_todo.insert(k, vec![])?;
return Ok(Some(cur_v));
}
}
Ok(None)
})?;
let removed = self
.store
.db()
.transaction(|mut tx| match tx.get(&self.store, k)? {
Some(cur_v) if blake2sum(&cur_v[..]) == vhash => {
tx.remove(&self.store, k)?;
tx.insert(&self.merkle_todo, k, vec![])?;
if let Some(old_v) = removed {
let old_entry = self.decode_entry(&old_v[..])?;
self.instance.updated(Some(&old_entry), None);
let old_entry = self.decode_entry(&cur_v[..]).map_err(db::TxError::Abort)?;
self.instance.updated(&mut tx, Some(&old_entry), None)?;
Ok(true)
}
_ => Ok(false),
})?;
if removed {
self.metrics.internal_delete_counter.add(1);
self.merkle_todo_notify.notify_one();
Ok(true)
} else {
Ok(false)
}
Ok(removed)
}
// ---- Utility functions ----
@ -315,7 +320,7 @@ where
}
}
pub fn gc_todo_len(&self) -> usize {
self.gc_todo.len()
pub fn gc_todo_len(&self) -> Result<usize, Error> {
Ok(self.gc_todo.len())
}
}

41
src/table/gc.rs
View file

@ -12,9 +12,10 @@ use futures::select;
use futures_util::future::*;
use tokio::sync::watch;
use garage_db::counted_tree_hack::CountedTree;
use garage_util::data::*;
use garage_util::error::*;
use garage_util::sled_counter::SledCountedTree;
use garage_util::time::*;
use garage_rpc::system::System;
@ -100,18 +101,16 @@ where
async fn gc_loop_iter(&self) -> Result<Option<Duration>, Error> {
let now = now_msec();
let mut entries = vec![];
let mut excluded = vec![];
// List entries in the GC todo list
// These entries are put there when a tombstone is inserted in the table
// (see update_entry in data.rs)
for entry_kv in self.data.gc_todo.iter() {
let mut candidates = vec![];
for entry_kv in self.data.gc_todo.iter()? {
let (k, vhash) = entry_kv?;
let mut todo_entry = GcTodoEntry::parse(&k, &vhash);
let todo_entry = GcTodoEntry::parse(&k, &vhash);
if todo_entry.deletion_time() > now {
if entries.is_empty() && excluded.is_empty() {
if candidates.is_empty() {
// If the earliest entry in the todo list shouldn't yet be processed,
// return a duration to wait in the loop
return Ok(Some(Duration::from_millis(
@ -123,15 +122,23 @@ where
}
}
let vhash = Hash::try_from(&vhash[..]).unwrap();
candidates.push(todo_entry);
if candidates.len() >= 2 * TABLE_GC_BATCH_SIZE {
break;
}
}
let mut entries = vec![];
let mut excluded = vec![];
for mut todo_entry in candidates {
// Check if the tombstone is still the current value of the entry.
// If not, we don't actually want to GC it, and we will remove it
// from the gc_todo table later (below).
let vhash = todo_entry.value_hash;
todo_entry.value = self
.data
.store
.get(&k[..])?
.get(&todo_entry.key[..])?
.filter(|v| blake2sum(&v[..]) == vhash)
.map(|v| v.to_vec());
@ -353,17 +360,17 @@ impl GcTodoEntry {
}
/// Parses a GcTodoEntry from a (k, v) pair stored in the gc_todo tree
pub(crate) fn parse(sled_k: &[u8], sled_v: &[u8]) -> Self {
pub(crate) fn parse(db_k: &[u8], db_v: &[u8]) -> Self {
Self {
tombstone_timestamp: u64::from_be_bytes(sled_k[0..8].try_into().unwrap()),
key: sled_k[8..].to_vec(),
value_hash: Hash::try_from(sled_v).unwrap(),
tombstone_timestamp: u64::from_be_bytes(db_k[0..8].try_into().unwrap()),
key: db_k[8..].to_vec(),
value_hash: Hash::try_from(db_v).unwrap(),
value: None,
}
}
/// Saves the GcTodoEntry in the gc_todo tree
pub(crate) fn save(&self, gc_todo_tree: &SledCountedTree) -> Result<(), Error> {
pub(crate) fn save(&self, gc_todo_tree: &CountedTree) -> Result<(), Error> {
gc_todo_tree.insert(self.todo_table_key(), self.value_hash.as_slice())?;
Ok(())
}
@ -373,9 +380,9 @@ impl GcTodoEntry {
/// This is usefull to remove a todo entry only under the condition
/// that it has not changed since the time it was read, i.e.
/// what we have to do is still the same
pub(crate) fn remove_if_equal(&self, gc_todo_tree: &SledCountedTree) -> Result<(), Error> {
let _ = gc_todo_tree.compare_and_swap::<_, _, Vec<u8>>(
&self.todo_table_key()[..],
pub(crate) fn remove_if_equal(&self, gc_todo_tree: &CountedTree) -> Result<(), Error> {
gc_todo_tree.compare_and_swap::<_, _, &[u8]>(
&self.todo_table_key(),
Some(self.value_hash),
None,
)?;

101
src/table/merkle.rs
View file

@ -4,11 +4,10 @@ use std::time::Duration;
use futures::select;
use futures_util::future::*;
use serde::{Deserialize, Serialize};
use sled::transaction::{
ConflictableTransactionError, ConflictableTransactionResult, TransactionalTree,
};
use tokio::sync::watch;
use garage_db as db;
use garage_util::background::BackgroundRunner;
use garage_util::data::*;
use garage_util::error::Error;
@ -90,35 +89,35 @@ where
async fn updater_loop(self: Arc<Self>, mut must_exit: watch::Receiver<bool>) {
while !*must_exit.borrow() {
if let Some(x) = self.data.merkle_todo.iter().next() {
match x {
Ok((key, valhash)) => {
if let Err(e) = self.update_item(&key[..], &valhash[..]) {
warn!(
"({}) Error while updating Merkle tree item: {}",
F::TABLE_NAME,
e
);
}
}
Err(e) => {
warn!(
"({}) Error while iterating on Merkle todo tree: {}",
F::TABLE_NAME,
e
);
tokio::time::sleep(Duration::from_secs(10)).await;
match self.updater_loop_iter() {
Ok(true) => (),
Ok(false) => {
select! {
_ = self.data.merkle_todo_notify.notified().fuse() => {},
_ = must_exit.changed().fuse() => {},
}
}
} else {
select! {
_ = self.data.merkle_todo_notify.notified().fuse() => {},
_ = must_exit.changed().fuse() => {},
Err(e) => {
warn!(
"({}) Error while updating Merkle tree item: {}",
F::TABLE_NAME,
e
);
tokio::time::sleep(Duration::from_secs(10)).await;
}
}
}
}
fn updater_loop_iter(&self) -> Result<bool, Error> {
if let Some((key, valhash)) = self.data.merkle_todo.first()? {
self.update_item(&key, &valhash)?;
Ok(true)
} else {
Ok(false)
}
}
fn update_item(&self, k: &[u8], vhash_by: &[u8]) -> Result<(), Error> {
let khash = blake2sum(k);
@ -137,13 +136,16 @@ where
};
self.data
.merkle_tree
.transaction(|tx| self.update_item_rec(tx, k, &khash, &key, new_vhash))?;
.db()
.transaction(|mut tx| self.update_item_rec(&mut tx, k, &khash, &key, new_vhash))?;
let deleted = self
.data
.merkle_todo
.compare_and_swap::<_, _, Vec<u8>>(k, Some(vhash_by), None)?
.is_ok();
let deleted = self.data.merkle_todo.db().transaction(|mut tx| {
let remove = matches!(tx.get(&self.data.merkle_todo, k)?, Some(ov) if ov == vhash_by);
if remove {
tx.remove(&self.data.merkle_todo, k)?;
}
Ok(remove)
})?;
if !deleted {
debug!(
@ -157,12 +159,12 @@ where
fn update_item_rec(
&self,
tx: &TransactionalTree,
tx: &mut db::Transaction<'_>,
k: &[u8],
khash: &Hash,
key: &MerkleNodeKey,
new_vhash: Option<Hash>,
) -> ConflictableTransactionResult<Option<Hash>, Error> {
) -> db::TxResult<Option<Hash>, Error> {
let i = key.prefix.len();
// Read node at current position (defined by the prefix stored in key)
@ -203,7 +205,7 @@ where
}
MerkleNode::Intermediate(_) => Some(MerkleNode::Intermediate(children)),
x @ MerkleNode::Leaf(_, _) => {
tx.remove(key_sub.encode())?;
tx.remove(&self.data.merkle_tree, key_sub.encode())?;
Some(x)
}
}
@ -283,28 +285,27 @@ where
fn read_node_txn(
&self,
tx: &TransactionalTree,
tx: &mut db::Transaction<'_>,
k: &MerkleNodeKey,
) -> ConflictableTransactionResult<MerkleNode, Error> {
let ent = tx.get(k.encode())?;
MerkleNode::decode_opt(ent).map_err(ConflictableTransactionError::Abort)
) -> db::TxResult<MerkleNode, Error> {
let ent = tx.get(&self.data.merkle_tree, k.encode())?;
MerkleNode::decode_opt(&ent).map_err(db::TxError::Abort)
}
fn put_node_txn(
&self,
tx: &TransactionalTree,
tx: &mut db::Transaction<'_>,
k: &MerkleNodeKey,
v: &MerkleNode,
) -> ConflictableTransactionResult<Hash, Error> {
) -> db::TxResult<Hash, Error> {
trace!("Put Merkle node: {:?} => {:?}", k, v);
if *v == MerkleNode::Empty {
tx.remove(k.encode())?;
tx.remove(&self.data.merkle_tree, k.encode())?;
Ok(self.empty_node_hash)
} else {
let vby = rmp_to_vec_all_named(v)
.map_err(|e| ConflictableTransactionError::Abort(e.into()))?;
let vby = rmp_to_vec_all_named(v).map_err(|e| db::TxError::Abort(e.into()))?;
let rethash = blake2sum(&vby[..]);
tx.insert(k.encode(), vby)?;
tx.insert(&self.data.merkle_tree, k.encode(), vby)?;
Ok(rethash)
}
}
@ -312,15 +313,15 @@ where
// Access a node in the Merkle tree, used by the sync protocol
pub(crate) fn read_node(&self, k: &MerkleNodeKey) -> Result<MerkleNode, Error> {
let ent = self.data.merkle_tree.get(k.encode())?;
MerkleNode::decode_opt(ent)
MerkleNode::decode_opt(&ent)
}
pub fn merkle_tree_len(&self) -> usize {
self.data.merkle_tree.len()
pub fn merkle_tree_len(&self) -> Result<usize, Error> {
Ok(self.data.merkle_tree.len()?)
}
pub fn todo_len(&self) -> usize {
self.data.merkle_todo.len()
pub fn todo_len(&self) -> Result<usize, Error> {
Ok(self.data.merkle_todo.len()?)
}
}
@ -347,7 +348,7 @@ impl MerkleNodeKey {
}
impl MerkleNode {
fn decode_opt(ent: Option<sled::IVec>) -> Result<Self, Error> {
fn decode_opt(ent: &Option<db::Value>) -> Result<Self, Error> {
match ent {
None => Ok(MerkleNode::Empty),
Some(v) => Ok(rmp_serde::decode::from_read_ref::<_, MerkleNode>(&v[..])?),

21
src/table/metrics.rs
View file

@ -1,6 +1,7 @@
use opentelemetry::{global, metrics::*, KeyValue};
use garage_util::sled_counter::SledCountedTree;
use garage_db as db;
use garage_db::counted_tree_hack::CountedTree;
/// TableMetrics reference all counter used for metrics
pub struct TableMetrics {
@ -19,21 +20,19 @@ pub struct TableMetrics {
pub(crate) sync_items_received: Counter<u64>,
}
impl TableMetrics {
pub fn new(
table_name: &'static str,
merkle_todo: sled::Tree,
gc_todo: SledCountedTree,
) -> Self {
pub fn new(table_name: &'static str, merkle_todo: db::Tree, gc_todo: CountedTree) -> Self {
let meter = global::meter(table_name);
TableMetrics {
_merkle_todo_len: meter
.u64_value_observer(
"table.merkle_updater_todo_queue_length",
move |observer| {
observer.observe(
merkle_todo.len() as u64,
&[KeyValue::new("table_name", table_name)],
)
if let Ok(v) = merkle_todo.len() {
observer.observe(
v as u64,
&[KeyValue::new("table_name", table_name)],
);
}
},
)
.with_description("Merkle tree updater TODO queue length")
@ -45,7 +44,7 @@ impl TableMetrics {
observer.observe(
gc_todo.len() as u64,
&[KeyValue::new("table_name", table_name)],
)
);
},
)
.with_description("Table garbage collector TODO queue length")

19
src/table/schema.rs
View file

@ -1,5 +1,6 @@
use serde::{Deserialize, Serialize};
use garage_db as db;
use garage_util::data::*;
use crate::crdt::Crdt;
@ -82,11 +83,19 @@ pub trait TableSchema: Send + Sync {
None
}
// Updated triggers some stuff downstream, but it is not supposed to block or fail,
// as the update itself is an unchangeable fact that will never go back
// due to CRDT logic. Typically errors in propagation of info should be logged
// to stderr.
fn updated(&self, _old: Option<&Self::E>, _new: Option<&Self::E>) {}
/// Actions triggered by data changing in a table. If such actions
/// include updates to the local database that should be applied
/// atomically with the item update itself, a db transaction is
/// provided on which these changes should be done.
/// This function can return a DB error but that's all.
fn updated(
&self,
_tx: &mut db::Transaction,
_old: Option<&Self::E>,
_new: Option<&Self::E>,
) -> db::TxOpResult<()> {
Ok(())
}
fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool;
}

16
src/table/sync.rs
View file

@ -258,9 +258,9 @@ where
while !*must_exit.borrow() {
let mut items = Vec::new();
for item in self.data.store.range(begin.to_vec()..end.to_vec()) {
for item in self.data.store.range(begin.to_vec()..end.to_vec())? {
let (key, value) = item?;
items.push((key.to_vec(), Arc::new(ByteBuf::from(value.as_ref()))));
items.push((key.to_vec(), Arc::new(ByteBuf::from(value))));
if items.len() >= 1024 {
break;
@ -603,8 +603,16 @@ impl SyncTodo {
let retain = nodes.contains(&my_id);
if !retain {
// Check if we have some data to send, otherwise skip
if data.store.range(begin..end).next().is_none() {
continue;
match data.store.range(begin..end) {
Ok(mut iter) => {
if iter.next().is_none() {
continue;
}
}
Err(e) => {
warn!("DB error in add_full_sync: {}", e);
continue;
}
}
}

4
src/table/table.rs
View file

@ -13,6 +13,8 @@ use opentelemetry::{
Context,
};
use garage_db as db;
use garage_util::data::*;
use garage_util::error::Error;
use garage_util::metrics::RecordDuration;
@ -69,7 +71,7 @@ where
{
// =============== PUBLIC INTERFACE FUNCTIONS (new, insert, get, etc) ===============
pub fn new(instance: F, replication: R, system: Arc<System>, db: &sled::Db) -> Arc<Self> {
pub fn new(instance: F, replication: R, system: Arc<System>, db: &db::Db) -> Arc<Self> {
let endpoint = system
.netapp
.endpoint(format!("garage_table/table.rs/Rpc:{}", F::TABLE_NAME));

4
src/util/Cargo.toml
View file

@ -14,6 +14,8 @@ path = "lib.rs"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
garage_db = { version = "0.8.0", path = "../db" }
blake2 = "0.9"
err-derive = "0.3"
xxhash-rust = { version = "0.8", default-features = false, features = ["xxh3"] }
@ -22,8 +24,6 @@ tracing = "0.1.30"
rand = "0.8"
sha2 = "0.9"
sled = "0.34"
chrono = "0.4"
rmp-serde = "0.15"
serde = { version = "1.0", default-features = false, features = ["derive", "rc"] }

11
src/util/config.rs
View file

@ -64,14 +64,19 @@ pub struct Config {
#[serde(default)]
pub kubernetes_skip_crd: bool,
// -- DB
/// Database engine to use for metadata (options: sled, sqlite, lmdb)
#[serde(default = "default_db_engine")]
pub db_engine: String,
/// Sled cache size, in bytes
#[serde(default = "default_sled_cache_capacity")]
pub sled_cache_capacity: u64,
/// Sled flush interval in milliseconds
#[serde(default = "default_sled_flush_every_ms")]
pub sled_flush_every_ms: u64,
// -- APIs
/// Configuration for S3 api
pub s3_api: S3ApiConfig,
@ -129,6 +134,10 @@ pub struct AdminConfig {
pub trace_sink: Option<String>,
}
fn default_db_engine() -> String {
"sled".into()
}
fn default_sled_cache_capacity() -> u64 {
128 * 1024 * 1024
}

12
src/util/error.rs
View file

@ -26,8 +26,8 @@ pub enum Error {
#[error(display = "Netapp error: {}", _0)]
Netapp(#[error(source)] netapp::error::Error),
#[error(display = "Sled error: {}", _0)]
Sled(#[error(source)] sled::Error),
#[error(display = "DB error: {}", _0)]
Db(#[error(source)] garage_db::Error),
#[error(display = "Messagepack encode error: {}", _0)]
RmpEncode(#[error(source)] rmp_serde::encode::Error),
@ -78,11 +78,11 @@ impl Error {
}
}
impl From<sled::transaction::TransactionError<Error>> for Error {
fn from(e: sled::transaction::TransactionError<Error>) -> Error {
impl From<garage_db::TxError<Error>> for Error {
fn from(e: garage_db::TxError<Error>) -> Error {
match e {
sled::transaction::TransactionError::Abort(x) => x,
sled::transaction::TransactionError::Storage(x) => Error::Sled(x),
garage_db::TxError::Abort(x) => x,
garage_db::TxError::Db(x) => Error::Db(x),
}
}
}

2
src/util/lib.rs
View file

@ -11,7 +11,7 @@ pub mod error;
pub mod formater;
pub mod metrics;
pub mod persister;
pub mod sled_counter;
//pub mod sled_counter;
pub mod time;
pub mod token_bucket;
pub mod tranquilizer;

100
src/util/sled_counter.rs
View file

@ -1,100 +0,0 @@
use std::sync::{
atomic::{AtomicUsize, Ordering},
Arc,
};
use sled::{CompareAndSwapError, IVec, Iter, Result, Tree};
#[derive(Clone)]
pub struct SledCountedTree(Arc<SledCountedTreeInternal>);
struct SledCountedTreeInternal {
tree: Tree,
len: AtomicUsize,
}
impl SledCountedTree {
pub fn new(tree: Tree) -> Self {
let len = tree.len();
Self(Arc::new(SledCountedTreeInternal {
tree,
len: AtomicUsize::new(len),
}))
}
pub fn len(&self) -> usize {
self.0.len.load(Ordering::Relaxed)
}
pub fn is_empty(&self) -> bool {
self.0.tree.is_empty()
}
pub fn get<K: AsRef<[u8]>>(&self, key: K) -> Result<Option<IVec>> {
self.0.tree.get(key)
}
pub fn iter(&self) -> Iter {
self.0.tree.iter()
}
// ---- writing functions ----
pub fn insert<K, V>(&self, key: K, value: V) -> Result<Option<IVec>>
where
K: AsRef<[u8]>,
V: Into<IVec>,
{
let res = self.0.tree.insert(key, value);
if res == Ok(None) {
self.0.len.fetch_add(1, Ordering::Relaxed);
}
res
}
pub fn remove<K: AsRef<[u8]>>(&self, key: K) -> Result<Option<IVec>> {
let res = self.0.tree.remove(key);
if matches!(res, Ok(Some(_))) {
self.0.len.fetch_sub(1, Ordering::Relaxed);
}
res
}
pub fn pop_min(&self) -> Result<Option<(IVec, IVec)>> {
let res = self.0.tree.pop_min();
if let Ok(Some(_)) = &res {
self.0.len.fetch_sub(1, Ordering::Relaxed);
};
res
}
pub fn compare_and_swap<K, OV, NV>(
&self,
key: K,
old: Option<OV>,
new: Option<NV>,
) -> Result<std::result::Result<(), CompareAndSwapError>>
where
K: AsRef<[u8]>,
OV: AsRef<[u8]>,
NV: Into<IVec>,
{
let old_some = old.is_some();
let new_some = new.is_some();
let res = self.0.tree.compare_and_swap(key, old, new);
if res == Ok(Ok(())) {
match (old_some, new_some) {
(false, true) => {
self.0.len.fetch_add(1, Ordering::Relaxed);
}
(true, false) => {
self.0.len.fetch_sub(1, Ordering::Relaxed);
}
_ => (),
}
}
res
}
}