mirror of
https://github.com/meilisearch/MeiliSearch
synced 2024-06-09 22:29:51 +02:00
437 lines
17 KiB
Rust
437 lines
17 KiB
Rust
use std::borrow::Cow;
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use std::collections::hash_map::Entry;
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use std::hash::Hash;
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use fxhash::FxHashMap;
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use heed::types::ByteSlice;
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use heed::{BytesDecode, BytesEncode, Database, RoTxn};
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use roaring::RoaringBitmap;
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use super::interner::Interned;
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use super::Word;
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use crate::heed_codec::StrBEU16Codec;
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use crate::{
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CboRoaringBitmapCodec, CboRoaringBitmapLenCodec, Result, RoaringBitmapCodec, SearchContext,
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};
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/// A cache storing pointers to values in the LMDB databases.
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///
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/// Used for performance reasons only. By using this cache, we avoid performing a
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/// database lookup and instead get a direct reference to the value using a fast
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/// local HashMap lookup.
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#[derive(Default)]
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pub struct DatabaseCache<'ctx> {
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pub word_pair_proximity_docids:
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FxHashMap<(u8, Interned<String>, Interned<String>), Option<&'ctx [u8]>>,
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pub word_prefix_pair_proximity_docids:
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FxHashMap<(u8, Interned<String>, Interned<String>), Option<&'ctx [u8]>>,
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pub prefix_word_pair_proximity_docids:
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FxHashMap<(u8, Interned<String>, Interned<String>), Option<&'ctx [u8]>>,
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pub word_docids: FxHashMap<Interned<String>, Option<&'ctx [u8]>>,
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pub exact_word_docids: FxHashMap<Interned<String>, Option<&'ctx [u8]>>,
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pub word_prefix_docids: FxHashMap<Interned<String>, Option<&'ctx [u8]>>,
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pub exact_word_prefix_docids: FxHashMap<Interned<String>, Option<&'ctx [u8]>>,
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pub words_fst: Option<fst::Set<Cow<'ctx, [u8]>>>,
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pub word_position_docids: FxHashMap<(Interned<String>, u16), Option<&'ctx [u8]>>,
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pub word_prefix_position_docids: FxHashMap<(Interned<String>, u16), Option<&'ctx [u8]>>,
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pub word_positions: FxHashMap<Interned<String>, Vec<u16>>,
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pub word_prefix_positions: FxHashMap<Interned<String>, Vec<u16>>,
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pub word_fid_docids: FxHashMap<(Interned<String>, u16), Option<&'ctx [u8]>>,
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pub word_prefix_fid_docids: FxHashMap<(Interned<String>, u16), Option<&'ctx [u8]>>,
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pub word_fids: FxHashMap<Interned<String>, Vec<u16>>,
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pub word_prefix_fids: FxHashMap<Interned<String>, Vec<u16>>,
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}
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impl<'ctx> DatabaseCache<'ctx> {
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fn get_value<'v, K1, KC>(
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txn: &'ctx RoTxn,
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cache_key: K1,
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db_key: &'v KC::EItem,
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cache: &mut FxHashMap<K1, Option<&'ctx [u8]>>,
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db: Database<KC, ByteSlice>,
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) -> Result<Option<&'ctx [u8]>>
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where
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K1: Copy + Eq + Hash,
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KC: BytesEncode<'v>,
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{
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let bitmap_ptr = match cache.entry(cache_key) {
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Entry::Occupied(bitmap_ptr) => *bitmap_ptr.get(),
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Entry::Vacant(entry) => {
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let bitmap_ptr = db.get(txn, db_key)?;
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entry.insert(bitmap_ptr);
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bitmap_ptr
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}
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};
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Ok(bitmap_ptr)
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}
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}
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impl<'ctx> SearchContext<'ctx> {
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pub fn get_words_fst(&mut self) -> Result<fst::Set<Cow<'ctx, [u8]>>> {
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if let Some(fst) = self.db_cache.words_fst.clone() {
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Ok(fst)
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} else {
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let fst = self.index.words_fst(self.txn)?;
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self.db_cache.words_fst = Some(fst.clone());
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Ok(fst)
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}
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}
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pub fn word_docids(&mut self, word: Word) -> Result<Option<RoaringBitmap>> {
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match word {
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Word::Original(word) => {
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let exact = self.get_db_exact_word_docids(word)?;
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let tolerant = self.get_db_word_docids(word)?;
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Ok(match (exact, tolerant) {
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(None, None) => None,
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(None, Some(tolerant)) => Some(tolerant),
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(Some(exact), None) => Some(exact),
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(Some(exact), Some(tolerant)) => {
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let mut both = exact;
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both |= tolerant;
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Some(both)
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}
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})
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}
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Word::Derived(word) => self.get_db_word_docids(word),
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}
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}
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/// Retrieve or insert the given value in the `word_docids` database.
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fn get_db_word_docids(&mut self, word: Interned<String>) -> Result<Option<RoaringBitmap>> {
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DatabaseCache::get_value(
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self.txn,
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word,
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self.word_interner.get(word).as_str(),
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&mut self.db_cache.word_docids,
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self.index.word_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| RoaringBitmapCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into()))
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.transpose()
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}
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fn get_db_exact_word_docids(
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&mut self,
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word: Interned<String>,
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) -> Result<Option<RoaringBitmap>> {
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DatabaseCache::get_value(
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self.txn,
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word,
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self.word_interner.get(word).as_str(),
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&mut self.db_cache.exact_word_docids,
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self.index.exact_word_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| RoaringBitmapCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into()))
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.transpose()
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}
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pub fn word_prefix_docids(&mut self, prefix: Word) -> Result<Option<RoaringBitmap>> {
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match prefix {
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Word::Original(prefix) => {
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let exact = self.get_db_exact_word_prefix_docids(prefix)?;
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let tolerant = self.get_db_word_prefix_docids(prefix)?;
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Ok(match (exact, tolerant) {
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(None, None) => None,
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(None, Some(tolerant)) => Some(tolerant),
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(Some(exact), None) => Some(exact),
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(Some(exact), Some(tolerant)) => {
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let mut both = exact;
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both |= tolerant;
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Some(both)
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}
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})
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}
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Word::Derived(prefix) => self.get_db_word_prefix_docids(prefix),
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}
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}
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/// Retrieve or insert the given value in the `word_prefix_docids` database.
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fn get_db_word_prefix_docids(
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&mut self,
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prefix: Interned<String>,
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) -> Result<Option<RoaringBitmap>> {
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DatabaseCache::get_value(
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self.txn,
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prefix,
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self.word_interner.get(prefix).as_str(),
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&mut self.db_cache.word_prefix_docids,
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self.index.word_prefix_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| RoaringBitmapCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into()))
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.transpose()
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}
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fn get_db_exact_word_prefix_docids(
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&mut self,
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prefix: Interned<String>,
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) -> Result<Option<RoaringBitmap>> {
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DatabaseCache::get_value(
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self.txn,
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prefix,
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self.word_interner.get(prefix).as_str(),
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&mut self.db_cache.exact_word_prefix_docids,
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self.index.exact_word_prefix_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| RoaringBitmapCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into()))
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.transpose()
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}
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pub fn get_db_word_pair_proximity_docids(
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&mut self,
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word1: Interned<String>,
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word2: Interned<String>,
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proximity: u8,
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) -> Result<Option<RoaringBitmap>> {
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DatabaseCache::get_value(
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self.txn,
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(proximity, word1, word2),
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&(
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proximity,
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self.word_interner.get(word1).as_str(),
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self.word_interner.get(word2).as_str(),
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),
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&mut self.db_cache.word_pair_proximity_docids,
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self.index.word_pair_proximity_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| CboRoaringBitmapCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into()))
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.transpose()
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}
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pub fn get_db_word_pair_proximity_docids_len(
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&mut self,
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word1: Interned<String>,
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word2: Interned<String>,
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proximity: u8,
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) -> Result<Option<u64>> {
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DatabaseCache::get_value(
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self.txn,
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(proximity, word1, word2),
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&(
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proximity,
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self.word_interner.get(word1).as_str(),
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self.word_interner.get(word2).as_str(),
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),
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&mut self.db_cache.word_pair_proximity_docids,
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self.index.word_pair_proximity_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| {
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CboRoaringBitmapLenCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into())
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})
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.transpose()
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}
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pub fn get_db_word_prefix_pair_proximity_docids(
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&mut self,
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word1: Interned<String>,
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prefix2: Interned<String>,
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proximity: u8,
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) -> Result<Option<RoaringBitmap>> {
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DatabaseCache::get_value(
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self.txn,
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(proximity, word1, prefix2),
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&(
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proximity,
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self.word_interner.get(word1).as_str(),
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self.word_interner.get(prefix2).as_str(),
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),
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&mut self.db_cache.word_prefix_pair_proximity_docids,
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self.index.word_prefix_pair_proximity_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| CboRoaringBitmapCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into()))
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.transpose()
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}
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pub fn get_db_prefix_word_pair_proximity_docids(
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&mut self,
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left_prefix: Interned<String>,
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right: Interned<String>,
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proximity: u8,
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) -> Result<Option<RoaringBitmap>> {
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DatabaseCache::get_value(
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self.txn,
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(proximity, left_prefix, right),
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&(
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proximity,
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self.word_interner.get(left_prefix).as_str(),
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self.word_interner.get(right).as_str(),
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),
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&mut self.db_cache.prefix_word_pair_proximity_docids,
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self.index.prefix_word_pair_proximity_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| CboRoaringBitmapCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into()))
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.transpose()
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}
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pub fn get_db_word_fid_docids(
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&mut self,
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word: Interned<String>,
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fid: u16,
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) -> Result<Option<RoaringBitmap>> {
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DatabaseCache::get_value(
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self.txn,
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(word, fid),
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&(self.word_interner.get(word).as_str(), fid),
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&mut self.db_cache.word_fid_docids,
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self.index.word_fid_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| CboRoaringBitmapCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into()))
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.transpose()
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}
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pub fn get_db_word_prefix_fid_docids(
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&mut self,
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word_prefix: Interned<String>,
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fid: u16,
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) -> Result<Option<RoaringBitmap>> {
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DatabaseCache::get_value(
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self.txn,
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(word_prefix, fid),
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&(self.word_interner.get(word_prefix).as_str(), fid),
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&mut self.db_cache.word_prefix_fid_docids,
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self.index.word_prefix_fid_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| CboRoaringBitmapCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into()))
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.transpose()
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}
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pub fn get_db_word_fids(&mut self, word: Interned<String>) -> Result<Vec<u16>> {
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let fids = match self.db_cache.word_fids.entry(word) {
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Entry::Occupied(fids) => fids.get().clone(),
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Entry::Vacant(entry) => {
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let mut key = self.word_interner.get(word).as_bytes().to_owned();
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key.push(0);
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let mut fids = vec![];
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let remap_key_type = self
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.index
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.word_fid_docids
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.remap_types::<ByteSlice, ByteSlice>()
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.prefix_iter(self.txn, &key)?
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.remap_key_type::<StrBEU16Codec>();
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for result in remap_key_type {
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let ((_, fid), value) = result?;
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// filling other caches to avoid searching for them again
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self.db_cache.word_fid_docids.insert((word, fid), Some(value));
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fids.push(fid);
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}
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entry.insert(fids.clone());
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fids
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}
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};
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Ok(fids)
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}
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pub fn get_db_word_prefix_fids(&mut self, word_prefix: Interned<String>) -> Result<Vec<u16>> {
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let fids = match self.db_cache.word_prefix_fids.entry(word_prefix) {
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Entry::Occupied(fids) => fids.get().clone(),
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Entry::Vacant(entry) => {
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let mut key = self.word_interner.get(word_prefix).as_bytes().to_owned();
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key.push(0);
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let mut fids = vec![];
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let remap_key_type = self
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.index
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.word_prefix_fid_docids
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.remap_types::<ByteSlice, ByteSlice>()
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.prefix_iter(self.txn, &key)?
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.remap_key_type::<StrBEU16Codec>();
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for result in remap_key_type {
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let ((_, fid), value) = result?;
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// filling other caches to avoid searching for them again
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self.db_cache.word_prefix_fid_docids.insert((word_prefix, fid), Some(value));
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fids.push(fid);
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}
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entry.insert(fids.clone());
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fids
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}
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};
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Ok(fids)
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}
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pub fn get_db_word_position_docids(
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&mut self,
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word: Interned<String>,
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position: u16,
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) -> Result<Option<RoaringBitmap>> {
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DatabaseCache::get_value(
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self.txn,
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(word, position),
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&(self.word_interner.get(word).as_str(), position),
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&mut self.db_cache.word_position_docids,
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self.index.word_position_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| CboRoaringBitmapCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into()))
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.transpose()
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}
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pub fn get_db_word_prefix_position_docids(
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&mut self,
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word_prefix: Interned<String>,
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position: u16,
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) -> Result<Option<RoaringBitmap>> {
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DatabaseCache::get_value(
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self.txn,
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(word_prefix, position),
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&(self.word_interner.get(word_prefix).as_str(), position),
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&mut self.db_cache.word_prefix_position_docids,
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self.index.word_prefix_position_docids.remap_data_type::<ByteSlice>(),
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)?
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.map(|bytes| CboRoaringBitmapCodec::bytes_decode(bytes).ok_or(heed::Error::Decoding.into()))
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.transpose()
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}
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pub fn get_db_word_positions(&mut self, word: Interned<String>) -> Result<Vec<u16>> {
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let positions = match self.db_cache.word_positions.entry(word) {
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Entry::Occupied(positions) => positions.get().clone(),
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Entry::Vacant(entry) => {
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let mut key = self.word_interner.get(word).as_bytes().to_owned();
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key.push(0);
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let mut positions = vec![];
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let remap_key_type = self
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.index
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.word_position_docids
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.remap_types::<ByteSlice, ByteSlice>()
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.prefix_iter(self.txn, &key)?
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.remap_key_type::<StrBEU16Codec>();
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for result in remap_key_type {
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let ((_, position), value) = result?;
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// filling other caches to avoid searching for them again
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self.db_cache.word_position_docids.insert((word, position), Some(value));
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positions.push(position);
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}
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entry.insert(positions.clone());
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positions
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}
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};
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Ok(positions)
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}
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pub fn get_db_word_prefix_positions(
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&mut self,
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word_prefix: Interned<String>,
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) -> Result<Vec<u16>> {
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let positions = match self.db_cache.word_prefix_positions.entry(word_prefix) {
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Entry::Occupied(positions) => positions.get().clone(),
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Entry::Vacant(entry) => {
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let mut key = self.word_interner.get(word_prefix).as_bytes().to_owned();
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key.push(0);
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let mut positions = vec![];
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let remap_key_type = self
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.index
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.word_prefix_position_docids
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.remap_types::<ByteSlice, ByteSlice>()
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.prefix_iter(self.txn, &key)?
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.remap_key_type::<StrBEU16Codec>();
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for result in remap_key_type {
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let ((_, position), value) = result?;
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// filling other caches to avoid searching for them again
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self.db_cache
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.word_prefix_position_docids
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.insert((word_prefix, position), Some(value));
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positions.push(position);
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}
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entry.insert(positions.clone());
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positions
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}
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};
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Ok(positions)
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}
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}
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