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use std::collections::Bound;
use std::iter::*;
extern crate owning_ref;
extern crate rand;
extern crate libc;
extern crate fnv;
mod disk;
use disk::*;
mod encoding;
mod error;
use error::*;
mod iter;
use iter::*;
mod memstore;
use memstore::*;
mod toc;
use toc::*;
mod util;
use util::*;
pub struct Store {
memstores: Vec<MemStore>,
threshold: usize,
directory: String,
toc_file: std::fs::File,
toc: Toc,
}
pub struct StoreIter<'a> {
interval: Interval<Buf>,
iters: MergeIterator<'a>,
direction: Direction,
}
impl Store {
pub fn create(dir: &str) -> Result<()> {
std::fs::create_dir(dir)?;
create_toc(dir)?;
return Ok(());
}
pub fn open(dir: &str, threshold: usize) -> Result<Store> {
let (toc_file, toc) = read_toc(dir)?;
return Ok(Store::make_existing(threshold, dir.to_string(), toc_file, toc, MemStore::new()));
}
fn make_existing(threshold: usize, directory: String, toc_file: std::fs::File, toc: Toc, ms: MemStore) -> Store {
return Store{
memstores: vec![MemStore::new(), ms],
threshold: threshold,
directory: directory,
toc_file: toc_file,
toc: toc,
}
}
pub fn insert(&mut self, key: &[u8], val: &[u8]) -> Result<bool> {
if !self.exists(key)? {
self.put(key, val)?;
return Ok(true);
}
return Ok(false);
}
pub fn replace(&mut self, key: &[u8], val: &[u8]) -> Result<bool> {
if self.exists(key)? {
self.put(key, val)?;
return Ok(true);
}
return Ok(false);
}
pub fn put(&mut self, key: &[u8], val: &[u8]) -> Result<()> {
self.memstores[0].apply(key.to_vec(), Mutation::Set(val.to_vec()));
return self.consider_split();
}
pub fn remove(&mut self, key: &[u8]) -> Result<bool> {
if self.exists(key)? {
self.memstores[0].apply(key.to_vec(), Mutation::Delete);
self.consider_split()?;
return Ok(true);
}
return Ok(false);
}
pub fn sync(&mut self) -> Result<()> {
use libc;
self.flush()?;
unsafe {
libc::sync();
}
return Ok(());
}
pub fn flush(&mut self) -> Result<()> {
let ms: MemStore = self.memstores.remove(0);
self.flush_and_record(0, &ms)?;
self.rebalance()?;
self.memstores.insert(0, MemStore::new());
return Ok(());
}
fn rebalance(&mut self) -> Result<()> {
if self.toc.level_infos.get(&0).map_or(false, |lz| lz.len() > 4) {
let table_ids: Vec<TableId>
= self.toc.level_infos.get(&0).unwrap().iter().rev().skip(1).map(|&x| x).collect();
self.relevel(0, table_ids)?;
return Ok(());
}
let max_level: LevelNumber
= self.toc.level_infos.iter().map(|(&level, _)| level).max().expect("at least one level");
for level in 1..max_level {
let to_relevel: (LevelNumber, TableId);
if let Some(table_ids) = self.toc.level_infos.get(&level) {
if table_ids.len() <= 4 * 10usize.pow(level as u32 - 1) {
continue;
}
let mut smallest_overlap = usize::max_value();
let mut smallest_overlap_table_id: TableId = TableId(0);
for &id in table_ids.iter() {
let infos: [TableInfo; 1]
= [self.toc.table_infos.get(&id).expect("toc valid in rebalance").clone()];
let lower_overlapping_ids: Vec<_> = Store::get_overlapping_tables(&self.toc, &infos, level + 1);
let overlap = lower_overlapping_ids.len();
if overlap < smallest_overlap {
smallest_overlap = overlap;
smallest_overlap_table_id = id;
}
}
assert!(smallest_overlap != usize::max_value());
to_relevel = (level, smallest_overlap_table_id);
} else {
continue;
}
self.relevel(to_relevel.0, vec![to_relevel.1])?;
}
return Ok(());
}
fn relevel<'a>(&'a mut self, level: LevelNumber, tables: Vec<TableId>) -> Result<()> {
assert!(if level == 0 { tables.len() > 0 } else { tables.len() == 1 });
let table_infos: Vec<TableInfo>
= tables.iter().map(|id| self.toc.table_infos.get(id).expect("toc valid in relevel").clone()).collect();
let lower_overlapping_ids: Vec<TableId> = Store::get_overlapping_tables(&self.toc, &table_infos, level + 1);
if lower_overlapping_ids.is_empty() && !Store::self_overlaps(&table_infos) {
let additions: Vec<TableInfo>
= table_infos.into_iter().map(|x: TableInfo| TableInfo{level: level, .. x}).collect();
let entry = Entry{
removals: tables,
additions: additions,
};
append_toc(&mut self.toc, &mut self.toc_file, entry)?;
return Ok(());
} else {
let mut iters: Vec<Box<MutationIterator + 'a>> = Vec::new();
for table_id in tables.iter().chain(lower_overlapping_ids.iter()) {
let interval = Interval{lower: Bound::Unbounded, upper: Bound::Unbounded};
self.add_table_iter_to_iters(&mut iters, *table_id, &interval, Direction::Forward)?;
}
let mut iter = MergeIterator::make(iters, Direction::Forward)?;
let mut additions: Vec<TableInfo> = Vec::new();
'outer: loop {
let mut builder = TableBuilder::new();
'inner: loop {
if let Some(key) = iter.current_key()?.map(|x| x.to_vec()) {
let mutation = iter.current_value()?;
builder.add_mutation(&key, &mutation);
iter.step()?;
if builder.lowerbound_file_size() > self.threshold {
break 'inner;
}
} else {
if builder.is_empty() {
break 'outer;
} else {
break 'inner;
}
}
}
let table_id = TableId(self.toc.next_table_id);
self.toc.next_table_id += 1;
let mut f = std::fs::File::create(table_filepath(&self.directory, table_id))?;
let (keys_offset, file_size, smallest, biggest) = builder.finish(&mut f)?;
additions.push(TableInfo{
id: table_id,
level: level + 1,
keys_offset: keys_offset,
file_size: file_size,
smallest_key: smallest,
biggest_key: biggest,
});
}
let removals: Vec<TableId>
= tables.iter().chain(lower_overlapping_ids.iter()).map(|&x| x).collect();
let entry = Entry{
additions: additions,
removals: removals,
};
let to_delete = append_toc(&mut self.toc, &mut self.toc_file, entry)?;
for table_id in to_delete {
std::fs::remove_file(table_filepath(&self.directory, table_id))?;
}
return Ok(());
}
}
fn table_overlaps_interval(x: &TableInfo, y: &Interval<Buf>) -> bool {
return !(!above_lower_bound(&x.biggest_key, &y.lower) || !below_upper_bound(&x.smallest_key, &y.upper));
}
fn self_overlaps(xs: &[TableInfo]) -> bool {
for i in 0..xs.len() {
for j in i+1..xs.len() {
if Store::tables_overlap(&xs[i], &xs[j]) {
return true;
}
}
}
return false;
}
fn tables_overlap(x: &TableInfo, y: &TableInfo) -> bool {
return !(x.biggest_key < y.smallest_key || y.biggest_key < x.smallest_key);
}
fn get_overlapping_tables(toc: &Toc, tables: &[TableInfo], level: LevelNumber) -> Vec<TableId> {
if let Some(level_tables) = toc.level_infos.get(&level) {
let mut ret: Vec<TableId> = Vec::new();
for id in level_tables {
for info in tables {
if Store::tables_overlap(toc.table_infos.get(id).expect("toc valid in get_overlapping_tables"), info) {
ret.push(*id);
break;
}
}
}
return ret;
} else {
return Vec::new();
}
}
fn consider_split(&mut self) -> Result<()> {
if self.memstores[0].mem_usage >= self.threshold {
self.flush()?;
}
return Ok(());
}
fn flush_and_record(&mut self, level: LevelNumber, ms: &MemStore) -> Result<()> {
if ms.entries.is_empty() {
return Ok(());
}
let table_id = TableId(self.toc.next_table_id);
self.toc.next_table_id += 1;
let (keys_offset, file_size, smallest, biggest) = flush_to_disk(&self.directory, table_id, &ms)?;
let ti = TableInfo{
id: table_id,
level: level,
keys_offset: keys_offset,
file_size: file_size,
smallest_key: smallest,
biggest_key: biggest,
};
append_toc(&mut self.toc, &mut self.toc_file, Entry{additions: vec![ti], removals: vec![]})?;
return Ok(());
}
pub fn exists(&mut self, key: &[u8]) -> Result<bool> {
for store in self.memstores.iter() {
if let Some(m) = store.lookup(key) {
return Ok(match m {
&Mutation::Set(_) => true,
&Mutation::Delete => false,
});
}
}
for (_level, table_ids) in self.toc.level_infos.iter() {
for table_id in table_ids.iter().rev() {
let ti: &TableInfo = self.toc.table_infos.get(table_id).expect("invalid toc");
if key >= &ti.smallest_key && key <= &ti.biggest_key {
let opt_mut = lookup_table(&self.directory, ti, key)?;
if let Some(m) = opt_mut {
return Ok(match m {
Mutation::Set(_) => true,
Mutation::Delete => false,
});
}
}
}
}
return Ok(false);
}
pub fn get(&mut self, key: &[u8]) -> Result<Option<Buf>> {
for store in self.memstores.iter() {
if let Some(m) = store.lookup(key) {
return Ok(match m {
&Mutation::Set(ref x) => Some(x.clone()),
&Mutation::Delete => None,
});
}
}
for (_level, table_ids) in self.toc.level_infos.iter() {
for table_id in table_ids.iter().rev() {
let ti: &TableInfo = self.toc.table_infos.get(table_id).expect("invalid toc");
if key >= &ti.smallest_key && key <= &ti.biggest_key {
let opt_mut = lookup_table(&self.directory, ti, key)?;
if let Some(m) = opt_mut {
return Ok(match m {
Mutation::Set(x) => Some(x),
Mutation::Delete => None,
});
}
}
}
}
return Ok(None);
}
fn add_table_iter_to_iters<'a>(
&self, iters: &mut Vec<Box<MutationIterator + 'a>>, table_id: TableId, interval: &Interval<Buf>,
direction: Direction
) -> Result<()> {
let ti: &TableInfo = self.toc.table_infos.get(&table_id).expect("invalid toc");
let iter = TableIterator::make(&self.directory, ti, interval, direction)?;
iters.push(Box::new(iter));
return Ok(());
}
pub fn range_directed<'a>(&'a self, interval: &Interval<Buf>, direction: Direction
) -> Result<StoreIter<'a>> {
let mut iters: Vec<Box<MutationIterator + 'a>> = Vec::new();
for store in self.memstores.iter() {
iters.push(Box::new(MemStoreIterator::<'a>::make(store, interval, direction)));
}
for (level, table_ids) in self.toc.level_infos.iter() {
if *level == 0 {
for table_id in table_ids.iter().rev() {
self.add_table_iter_to_iters(&mut iters, *table_id, &interval, direction)?;
}
} else {
let mut table_infos: Vec<&'a TableInfo> = Vec::new();
for table_id in table_ids.iter() {
let table_info: &TableInfo = self.toc.table_infos.get(table_id).expect("valid toc in range");
if Store::table_overlaps_interval(table_info, interval) {
table_infos.push(table_info);
}
}
table_infos.sort_unstable_by(|x, y| {
let res = x.smallest_key.cmp(&y.smallest_key);
match direction { Direction::Forward => res, Direction::Backward => res.reverse() }
});
let interval = interval.clone();
let mut ti_index = 0;
iters.push(Box::new(ConcatIterator::<'a>::make(Box::new(move || {
Ok(if ti_index == table_infos.len() {
None
} else {
let ti: &TableInfo = table_infos[ti_index];
ti_index += 1;
Some(Box::new(TableIterator::make(&self.directory, ti, &interval, direction)?))
})
}))?));
}
}
return Ok(StoreIter{
interval: interval.clone(),
iters: MergeIterator::make(iters, direction)?,
direction: direction,
});
}
pub fn range<'a>(&'a self, interval: &Interval<Buf>) -> Result<StoreIter<'a>> {
return self.range_directed(interval, Direction::Forward);
}
pub fn range_descending<'a>(&'a self, interval: &Interval<Buf>) -> Result<StoreIter<'a>> {
return self.range_directed(interval, Direction::Backward);
}
pub fn next(&self, iter: &mut StoreIter) -> Result<Option<(Buf, Buf)>> {
loop {
let keyvec: Vec<u8>;
if let Some(key) = iter.iters.current_key()? {
let abandon = match iter.direction {
Direction::Forward => !below_upper_bound(key, &iter.interval.upper),
Direction::Backward => !above_lower_bound(key, &iter.interval.lower),
};
if abandon {
return Ok(None);
}
keyvec = key.to_vec();
} else {
return Ok(None);
}
let mutation: Mutation = iter.iters.current_value()?;
iter.iters.step()?;
match mutation {
Mutation::Set(value) => {
return Ok(Some((keyvec, value)));
},
Mutation::Delete => {
continue;
}
}
}
}
}
#[cfg(test)]
mod tests {
use std::collections::Bound;
use super::*;
use rand::*;
struct TestStore {
store: Option<Store>,
directory: String,
}
fn random_testdir() -> String {
let mut rng = rand::thread_rng();
let mut x: u32 = rng.gen();
let mut ret = "testdir-".to_string();
for _ in 0..6 {
ret.push(std::char::from_u32(97 + (x % 26)).unwrap());
x /= 26;
}
return ret;
}
impl Drop for TestStore {
fn drop(&mut self) {
self.close();
std::fs::remove_dir_all(&self.directory).expect("remove_dir_all");
}
}
impl TestStore {
fn create(threshold: usize) -> TestStore {
let dir: String = random_testdir();
Store::create(&dir).unwrap();
let mut ts = TestStore{store: None, directory: dir};
ts.open(threshold);
return ts;
}
fn open(&mut self, threshold: usize) {
assert!(self.store.is_none());
let store: Store = Store::open(&self.directory, threshold).unwrap();
self.store = Some(store);
}
fn close(&mut self) -> Option<()> {
return self.store.take().map(|_| ());
}
fn kv(&mut self) -> &mut Store {
return self.store.as_mut().unwrap();
}
}
fn b(s: &str) -> &[u8] {
return s.as_bytes();
}
#[test]
fn putget() {
let mut ts = TestStore::create(100);
let kv = ts.kv();
kv.put(b("foo"), b("Hey")).unwrap();
let x: Option<Buf> = kv.get(b("foo")).unwrap();
assert_eq!(Some(b("Hey").to_vec()), x);
assert!(kv.exists(b("foo")).unwrap());
assert_eq!(None, kv.get(b("bar")).unwrap());
assert!(!kv.exists(b("bar")).unwrap());
}
#[test]
fn range() {
let mut ts = TestStore::create(100);
let kv = ts.kv();
kv.put(b("a"), b("alpha")).unwrap();
kv.put(b("b"), b("beta")).unwrap();
kv.put(b("c"), b("charlie")).unwrap();
kv.put(b("d"), b("delta")).unwrap();
let interval = Interval::<Buf>{lower: Bound::Unbounded, upper: Bound::Excluded(b("d").to_vec())};
{
let mut it: StoreIter = kv.range(&interval).expect("range");
assert_eq!(Some((b("a").to_vec(), b("alpha").to_vec())), kv.next(&mut it).unwrap());
assert_eq!(Some((b("b").to_vec(), b("beta").to_vec())), kv.next(&mut it).unwrap());
assert_eq!(Some((b("c").to_vec(), b("charlie").to_vec())), kv.next(&mut it).unwrap());
assert_eq!(None, kv.next(&mut it).unwrap());
}
{
let mut it: StoreIter = kv.range_descending(&interval).expect("range");
assert_eq!(Some((b("c").to_vec(), b("charlie").to_vec())), kv.next(&mut it).unwrap());
assert_eq!(Some((b("b").to_vec(), b("beta").to_vec())), kv.next(&mut it).unwrap());
assert_eq!(Some((b("a").to_vec(), b("alpha").to_vec())), kv.next(&mut it).unwrap());
assert_eq!(None, kv.next(&mut it).unwrap());
}
}
#[test]
fn overwrite() {
let mut ts = TestStore::create(100);
let kv = ts.kv();
kv.put(b("a"), b("alpha")).unwrap();
kv.put(b("a"), b("alpha-2")).unwrap();
assert_eq!(Some(b("alpha-2").to_vec()), kv.get(b("a")).unwrap());
let inserted: bool = kv.insert(b("a"), b("alpha-3")).unwrap();
assert!(!inserted);
let overwrote: bool = kv.replace(b("a"), b("alpha-4")).unwrap();
assert!(overwrote);
assert_eq!(Some(b("alpha-4").to_vec()), kv.get(b("a")).unwrap());
}
fn write_basic_kv(ts: &mut TestStore) {
let kv = ts.kv();
for i in (0..102).rev() {
kv.put(b(&i.to_string()), b(&format!("value-{}", i.to_string()))).unwrap();
}
let removed: bool = kv.remove(b("11")).unwrap();
assert!(removed);
assert!(1 < kv.memstores.len());
}
fn verify_basic_kv(ts: &mut TestStore) {
let kv = ts.kv();
{
let interval = Interval::<Buf>{lower: Bound::Excluded(b("1").to_vec()), upper: Bound::Unbounded};
let mut it: StoreIter = kv.range(&interval).expect("range");
assert_eq!(Some((b("10").to_vec(), b("value-10").to_vec())), kv.next(&mut it).unwrap());
assert_eq!(Some((b("100").to_vec(), b("value-100").to_vec())), kv.next(&mut it).unwrap());
assert_eq!(Some((b("101").to_vec(), b("value-101").to_vec())), kv.next(&mut it).unwrap());
assert_eq!(Some((b("12").to_vec(), b("value-12").to_vec())), kv.next(&mut it).unwrap());
assert_eq!(Some((b("13").to_vec(), b("value-13").to_vec())), kv.next(&mut it).unwrap());
}
{
let interval = Interval::<Buf>{lower: Bound::Unbounded, upper: Bound::Excluded(b("99").to_vec())};
let mut it: StoreIter = kv.range_descending(&interval).expect("range descending");
assert_eq!(Some((b("98").to_vec(), b("value-98").to_vec())), kv.next(&mut it).unwrap());
assert_eq!(Some((b("97").to_vec(), b("value-97").to_vec())), kv.next(&mut it).unwrap());
}
}
#[test]
fn many() {
let mut ts = TestStore::create(100);
write_basic_kv(&mut ts);
verify_basic_kv(&mut ts);
}
#[test]
fn disk() {
let mut ts = TestStore::create(100);
write_basic_kv(&mut ts);
ts.kv().flush().unwrap();
assert!(ts.close().is_some());
ts.open(100);
verify_basic_kv(&mut ts);
}
#[test]
fn disk_missing_key() {
let mut ts = TestStore::create(100);
write_basic_kv(&mut ts);
ts.kv().flush().unwrap();
assert!(ts.close().is_some());
ts.open(100);
assert_eq!(None, ts.kv().get(b("bogus")).unwrap());
}
fn big_key(num: u64) -> Buf { format!("{:08}", num).as_bytes().to_vec() }
fn big_value(num: u64) -> Buf { format!("value-{}", num).as_bytes().to_vec() }
fn write_big_kv(ts: &mut TestStore, n: u64) {
let kv = ts.kv();
for i in 0..n {
kv.put(&big_key(i), &big_value(i)).unwrap();
}
for j in 0..n/2 {
let i = j * 2 + 1;
let removed: bool = kv.remove(&big_key(i)).unwrap();
assert!(removed);
}
}
fn verify_big_kv_range(kv: &mut Store, low: u64, high: u64) {
let interval = Interval::<Buf>{
lower: Bound::Included(big_key(low)),
upper: Bound::Included(big_key(high)),
};
{
let mut i = low;
if i % 2 == 1 {
i += 1;
}
let mut it: StoreIter = kv.range(&interval).expect("range");
while let Some((k, v)) = kv.next(&mut it).expect("next") {
assert_eq!(&big_key(i), &k);
assert_eq!(&big_value(i), &v);
i += 2;
}
if high % 2 == 0 {
assert_eq!(high + 2, i);
} else {
assert_eq!(high + 1, i);
}
}
{
let mut i = high;
if i % 2 == 1 {
i -= 1;
}
let mut it: StoreIter = kv.range_descending(&interval).expect("range_descending");
while let Some((k, v)) = kv.next(&mut it).expect("next desc") {
assert_eq!(&big_key(i), &k);
assert_eq!(&big_value(i), &v);
i -= 2;
}
if low % 2 == 0 {
assert_eq!(low - 2, i);
} else {
assert_eq!(low - 1, i);
}
}
}
fn verify_big_kv(ts: &mut TestStore) {
let kv = ts.kv();
verify_big_kv_range(kv, 145, 346);
}
#[test]
fn big_many() {
let mut ts = TestStore::create(100);
write_big_kv(&mut ts, 1000);
verify_big_kv(&mut ts);
}
#[test]
fn big_many_disk() {
let mut ts = TestStore::create(100);
write_big_kv(&mut ts, 1000);
ts.kv().flush().unwrap();
assert!(ts.close().is_some());
ts.open(100);
verify_big_kv(&mut ts);
}
#[test]
fn big_many_threshold() {
let mut ts = TestStore::create(2000000);
write_big_kv(&mut ts, 1000);
ts.kv().flush().unwrap();
assert!(ts.close().is_some());
ts.open(100);
verify_big_kv(&mut ts);
}
#[test]
fn sync() {
let mut ts = TestStore::create(100);
write_basic_kv(&mut ts);
ts.kv().sync().expect("sync to succeed");
}
}