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Introduce multiple functions to clean up the code

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Kerollmops 2020-07-01 17:24:55 +02:00
parent ac5cc7ddad
commit a3ac2623d5
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GPG Key ID: 92ADA4E935E71FA4
1 changed files with 43 additions and 32 deletions
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75
src/bin/indexer.rs
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@ -1,6 +1,7 @@
use std::collections::hash_map::Entry;
use std::collections::{HashMap, BTreeSet};
use std::convert::{TryFrom, TryInto};
use std::hash::{Hash, BuildHasher};
use std::io;
use std::path::PathBuf;
use std::sync::atomic::{AtomicUsize, Ordering};
@ -43,6 +44,39 @@ struct Opt {
csv_file: Option<PathBuf>,
}
fn put_evicted_into_heed<I>(wtxn: &mut heed::RwTxn, index: &Index, iter: I) -> anyhow::Result<()>
where
I: IntoIterator<Item = (String, (RoaringBitmap, FastMap4<u32, RoaringBitmap>))>
{
for (word, (positions, positions_docids)) in iter {
index.word_positions.put(wtxn, &word, &positions)?;
for (position, docids) in positions_docids {
let mut key = word.as_bytes().to_vec();
key.extend_from_slice(&position.to_be_bytes());
index.word_position_docids.put(wtxn, &key, &docids)?;
}
}
Ok(())
}
fn merge_hashmaps<K, V, S, F>(mut a: HashMap<K, V, S>, mut b: HashMap<K, V, S>, mut merge: F) -> HashMap<K, V, S>
where
K: Hash + Eq,
S: BuildHasher,
F: FnMut(&K, &mut V, V)
{
for (k, v) in a.iter_mut() {
if let Some(vb) = b.remove(k) {
(merge)(k, v, vb)
}
}
a.extend(b);
a
}
fn index_csv<R: io::Read>(wtxn: &mut heed::RwTxn, mut rdr: csv::Reader<R>, index: &Index) -> anyhow::Result<()> {
eprintln!("Indexing into LMDB...");
@ -67,11 +101,13 @@ fn index_csv<R: io::Read>(wtxn: &mut heed::RwTxn, mut rdr: csv::Reader<R>, index
let position = (attr * 1000 + pos) as u32;
match words_cache.get_mut(&word) {
Some((ids, positions)) => {
(Some(entry), evicted) => {
let (ids, positions) = entry;
ids.insert(position);
positions.entry(position).or_default().insert(document_id);
put_evicted_into_heed(wtxn, index, evicted)?;
},
None => {
(None, _evicted) => {
let mut key = word.as_bytes().to_vec();
key.extend_from_slice(&position.to_be_bytes());
@ -85,28 +121,11 @@ fn index_csv<R: io::Read>(wtxn: &mut heed::RwTxn, mut rdr: csv::Reader<R>, index
map.insert(position, words_position_docids);
let value = (words_positions, map);
// TODO clean this up
let merge = |(pa, mut pda): (_, FastMap4<_, RoaringBitmap>), (pb, mut pdb): (_, FastMap4<_, RoaringBitmap>)| {
for (pos, dia) in &mut pda {
if let Some(dib) = pdb.remove(pos) {
dia.union_with(&dib);
}
}
let evicted = words_cache.insert(word.clone(), value, |(pa, pda), (pb, pdb)| {
(pa | pb, merge_hashmaps(pda, pdb, |_, a, b| RoaringBitmap::union_with(a, &b)))
});
pdb.into_iter().for_each(|(pos, map)| drop(pda.insert(pos, map)));
(pa | pb, pda)
};
for (word, (positions, positions_docids)) in words_cache.insert(word.clone(), value, merge) {
index.word_positions.put(wtxn, &word, &positions)?;
for (position, docids) in positions_docids {
let mut key = word.as_bytes().to_vec();
key.extend_from_slice(&position.to_be_bytes());
index.word_position_docids.put(wtxn, &key, &docids)?;
}
}
put_evicted_into_heed(wtxn, index, evicted)?;
}
}
}
@ -120,15 +139,7 @@ fn index_csv<R: io::Read>(wtxn: &mut heed::RwTxn, mut rdr: csv::Reader<R>, index
index.documents.put(wtxn, &BEU32::new(document_id), &document)?;
}
for (word, (positions, positions_docids)) in &words_cache {
index.word_positions.put(wtxn, &word, &positions)?;
for (position, docids) in positions_docids {
let mut key = word.as_bytes().to_vec();
key.extend_from_slice(&position.to_be_bytes());
index.word_position_docids.put(wtxn, &key, &docids)?;
}
}
put_evicted_into_heed(wtxn, index, words_cache)?;
// We store the words from the postings.
let mut new_words = BTreeSet::default();