use std::cmp::min; use std::collections::{BTreeMap, BTreeSet, HashSet}; use std::str::FromStr; use std::time::Instant; use either::Either; use meilisearch_types::{milli, Document}; use milli::tokenizer::TokenizerBuilder; use milli::{ AscDesc, FieldId, FieldsIdsMap, Filter, FormatOptions, Index, MatchBounds, MatcherBuilder, SortError, TermsMatchingStrategy, DEFAULT_VALUES_PER_FACET, }; use regex::Regex; use serde::{Deserialize, Serialize}; use serde_json::{json, Value}; use crate::error::MeilisearchHttpError; type MatchesPosition = BTreeMap>; pub const DEFAULT_SEARCH_LIMIT: fn() -> usize = || 20; pub const DEFAULT_CROP_LENGTH: fn() -> usize = || 10; pub const DEFAULT_CROP_MARKER: fn() -> String = || "…".to_string(); pub const DEFAULT_HIGHLIGHT_PRE_TAG: fn() -> String = || "".to_string(); pub const DEFAULT_HIGHLIGHT_POST_TAG: fn() -> String = || "".to_string(); /// The maximimum number of results that the engine /// will be able to return in one search call. pub const DEFAULT_PAGINATION_MAX_TOTAL_HITS: usize = 1000; #[derive(Deserialize, Debug, Clone, PartialEq, Eq)] #[serde(rename_all = "camelCase", deny_unknown_fields)] pub struct SearchQuery { pub q: Option, pub offset: Option, #[serde(default = "DEFAULT_SEARCH_LIMIT")] pub limit: usize, pub attributes_to_retrieve: Option>, pub attributes_to_crop: Option>, #[serde(default = "DEFAULT_CROP_LENGTH")] pub crop_length: usize, pub attributes_to_highlight: Option>, // Default to false #[serde(default = "Default::default")] pub show_matches_position: bool, pub filter: Option, pub sort: Option>, pub facets: Option>, #[serde(default = "DEFAULT_HIGHLIGHT_PRE_TAG")] pub highlight_pre_tag: String, #[serde(default = "DEFAULT_HIGHLIGHT_POST_TAG")] pub highlight_post_tag: String, #[serde(default = "DEFAULT_CROP_MARKER")] pub crop_marker: String, #[serde(default)] pub matching_strategy: MatchingStrategy, } #[derive(Deserialize, Debug, Clone, PartialEq, Eq)] #[serde(rename_all = "camelCase")] pub enum MatchingStrategy { /// Remove query words from last to first Last, /// All query words are mandatory All, } impl Default for MatchingStrategy { fn default() -> Self { Self::Last } } impl From for TermsMatchingStrategy { fn from(other: MatchingStrategy) -> Self { match other { MatchingStrategy::Last => Self::Last, MatchingStrategy::All => Self::All, } } } #[derive(Debug, Clone, Serialize, PartialEq)] pub struct SearchHit { #[serde(flatten)] pub document: Document, #[serde(rename = "_formatted", skip_serializing_if = "Document::is_empty")] pub formatted: Document, #[serde(rename = "_matchesPosition", skip_serializing_if = "Option::is_none")] pub matches_position: Option, } #[derive(Serialize, Debug, Clone, PartialEq)] #[serde(rename_all = "camelCase")] pub struct SearchResult { pub hits: Vec, pub estimated_total_hits: u64, pub query: String, pub limit: usize, pub offset: usize, pub processing_time_ms: u128, #[serde(skip_serializing_if = "Option::is_none")] pub facet_distribution: Option>>, } pub fn perform_search( index: &Index, query: SearchQuery, ) -> Result { let before_search = Instant::now(); let rtxn = index.read_txn()?; let mut search = index.search(&rtxn); if let Some(ref query) = query.q { search.query(query); } search.terms_matching_strategy(query.matching_strategy.into()); let max_total_hits = index .pagination_max_total_hits(&rtxn) .map_err(milli::Error::from)? .unwrap_or(DEFAULT_PAGINATION_MAX_TOTAL_HITS); // Make sure that a user can't get more documents than the hard limit, // we align that on the offset too. let offset = min(query.offset.unwrap_or(0), max_total_hits); let limit = min(query.limit, max_total_hits.saturating_sub(offset)); search.offset(offset); search.limit(limit); if let Some(ref filter) = query.filter { if let Some(facets) = parse_filter(filter)? { search.filter(facets); } } if let Some(ref sort) = query.sort { let sort = match sort.iter().map(|s| AscDesc::from_str(s)).collect() { Ok(sorts) => sorts, Err(asc_desc_error) => { return Err(milli::Error::from(SortError::from(asc_desc_error)).into()) } }; search.sort_criteria(sort); } let milli::SearchResult { documents_ids, matching_words, candidates, .. } = search.execute()?; let fields_ids_map = index.fields_ids_map(&rtxn).unwrap(); let displayed_ids = index .displayed_fields_ids(&rtxn)? .map(|fields| fields.into_iter().collect::>()) .unwrap_or_else(|| fields_ids_map.iter().map(|(id, _)| id).collect()); let fids = |attrs: &BTreeSet| { let mut ids = BTreeSet::new(); for attr in attrs { if attr == "*" { ids = displayed_ids.clone(); break; } if let Some(id) = fields_ids_map.id(attr) { ids.insert(id); } } ids }; // The attributes to retrieve are the ones explicitly marked as to retrieve (all by default), // but these attributes must be also be present // - in the fields_ids_map // - in the the displayed attributes let to_retrieve_ids: BTreeSet<_> = query .attributes_to_retrieve .as_ref() .map(fids) .unwrap_or_else(|| displayed_ids.clone()) .intersection(&displayed_ids) .cloned() .collect(); let attr_to_highlight = query.attributes_to_highlight.unwrap_or_default(); let attr_to_crop = query.attributes_to_crop.unwrap_or_default(); // Attributes in `formatted_options` correspond to the attributes that will be in `_formatted` // These attributes are: // - the attributes asked to be highlighted or cropped (with `attributesToCrop` or `attributesToHighlight`) // - the attributes asked to be retrieved: these attributes will not be highlighted/cropped // But these attributes must be also present in displayed attributes let formatted_options = compute_formatted_options( &attr_to_highlight, &attr_to_crop, query.crop_length, &to_retrieve_ids, &fields_ids_map, &displayed_ids, ); let tokenizer = TokenizerBuilder::default().build(); let mut formatter_builder = MatcherBuilder::new(matching_words, tokenizer); formatter_builder.crop_marker(query.crop_marker); formatter_builder.highlight_prefix(query.highlight_pre_tag); formatter_builder.highlight_suffix(query.highlight_post_tag); let mut documents = Vec::new(); let documents_iter = index.documents(&rtxn, documents_ids)?; for (_id, obkv) in documents_iter { // First generate a document with all the displayed fields let displayed_document = make_document(&displayed_ids, &fields_ids_map, obkv)?; // select the attributes to retrieve let attributes_to_retrieve = to_retrieve_ids .iter() .map(|&fid| fields_ids_map.name(fid).expect("Missing field name")); let mut document = permissive_json_pointer::select_values(&displayed_document, attributes_to_retrieve); let (matches_position, formatted) = format_fields( &displayed_document, &fields_ids_map, &formatter_builder, &formatted_options, query.show_matches_position, &displayed_ids, )?; if let Some(sort) = query.sort.as_ref() { insert_geo_distance(sort, &mut document); } let hit = SearchHit { document, formatted, matches_position, }; documents.push(hit); } let estimated_total_hits = candidates.len(); let facet_distribution = match query.facets { Some(ref fields) => { let mut facet_distribution = index.facets_distribution(&rtxn); let max_values_by_facet = index .max_values_per_facet(&rtxn) .map_err(milli::Error::from)? .unwrap_or(DEFAULT_VALUES_PER_FACET); facet_distribution.max_values_per_facet(max_values_by_facet); if fields.iter().all(|f| f != "*") { facet_distribution.facets(fields); } let distribution = facet_distribution.candidates(candidates).execute()?; Some(distribution) } None => None, }; let result = SearchResult { hits: documents, estimated_total_hits, query: query.q.clone().unwrap_or_default(), limit: query.limit, offset: query.offset.unwrap_or_default(), processing_time_ms: before_search.elapsed().as_millis(), facet_distribution, }; Ok(result) } fn insert_geo_distance(sorts: &[String], document: &mut Document) { lazy_static::lazy_static! { static ref GEO_REGEX: Regex = Regex::new(r"_geoPoint\(\s*([[:digit:].\-]+)\s*,\s*([[:digit:].\-]+)\s*\)").unwrap(); }; if let Some(capture_group) = sorts.iter().find_map(|sort| GEO_REGEX.captures(sort)) { // TODO: TAMO: milli encountered an internal error, what do we want to do? let base = [ capture_group[1].parse().unwrap(), capture_group[2].parse().unwrap(), ]; let geo_point = &document.get("_geo").unwrap_or(&json!(null)); if let Some((lat, lng)) = geo_point["lat"].as_f64().zip(geo_point["lng"].as_f64()) { let distance = milli::distance_between_two_points(&base, &[lat, lng]); document.insert("_geoDistance".to_string(), json!(distance.round() as usize)); } } } fn compute_formatted_options( attr_to_highlight: &HashSet, attr_to_crop: &[String], query_crop_length: usize, to_retrieve_ids: &BTreeSet, fields_ids_map: &FieldsIdsMap, displayed_ids: &BTreeSet, ) -> BTreeMap { let mut formatted_options = BTreeMap::new(); add_highlight_to_formatted_options( &mut formatted_options, attr_to_highlight, fields_ids_map, displayed_ids, ); add_crop_to_formatted_options( &mut formatted_options, attr_to_crop, query_crop_length, fields_ids_map, displayed_ids, ); // Should not return `_formatted` if no valid attributes to highlight/crop if !formatted_options.is_empty() { add_non_formatted_ids_to_formatted_options(&mut formatted_options, to_retrieve_ids); } formatted_options } fn add_highlight_to_formatted_options( formatted_options: &mut BTreeMap, attr_to_highlight: &HashSet, fields_ids_map: &FieldsIdsMap, displayed_ids: &BTreeSet, ) { for attr in attr_to_highlight { let new_format = FormatOptions { highlight: true, crop: None, }; if attr == "*" { for id in displayed_ids { formatted_options.insert(*id, new_format); } break; } if let Some(id) = fields_ids_map.id(attr) { if displayed_ids.contains(&id) { formatted_options.insert(id, new_format); } } } } fn add_crop_to_formatted_options( formatted_options: &mut BTreeMap, attr_to_crop: &[String], crop_length: usize, fields_ids_map: &FieldsIdsMap, displayed_ids: &BTreeSet, ) { for attr in attr_to_crop { let mut split = attr.rsplitn(2, ':'); let (attr_name, attr_len) = match split.next().zip(split.next()) { Some((len, name)) => { let crop_len = len.parse::().unwrap_or(crop_length); (name, crop_len) } None => (attr.as_str(), crop_length), }; if attr_name == "*" { for id in displayed_ids { formatted_options .entry(*id) .and_modify(|f| f.crop = Some(attr_len)) .or_insert(FormatOptions { highlight: false, crop: Some(attr_len), }); } } if let Some(id) = fields_ids_map.id(attr_name) { if displayed_ids.contains(&id) { formatted_options .entry(id) .and_modify(|f| f.crop = Some(attr_len)) .or_insert(FormatOptions { highlight: false, crop: Some(attr_len), }); } } } } fn add_non_formatted_ids_to_formatted_options( formatted_options: &mut BTreeMap, to_retrieve_ids: &BTreeSet, ) { for id in to_retrieve_ids { formatted_options.entry(*id).or_insert(FormatOptions { highlight: false, crop: None, }); } } fn make_document( displayed_attributes: &BTreeSet, field_ids_map: &FieldsIdsMap, obkv: obkv::KvReaderU16, ) -> Result { let mut document = serde_json::Map::new(); // recreate the original json for (key, value) in obkv.iter() { let value = serde_json::from_slice(value)?; let key = field_ids_map .name(key) .expect("Missing field name") .to_string(); document.insert(key, value); } // select the attributes to retrieve let displayed_attributes = displayed_attributes .iter() .map(|&fid| field_ids_map.name(fid).expect("Missing field name")); let document = permissive_json_pointer::select_values(&document, displayed_attributes); Ok(document) } fn format_fields<'a, A: AsRef<[u8]>>( document: &Document, field_ids_map: &FieldsIdsMap, builder: &MatcherBuilder<'a, A>, formatted_options: &BTreeMap, compute_matches: bool, displayable_ids: &BTreeSet, ) -> Result<(Option, Document), MeilisearchHttpError> { let mut matches_position = compute_matches.then(BTreeMap::new); let mut document = document.clone(); // select the attributes to retrieve let displayable_names = displayable_ids .iter() .map(|&fid| field_ids_map.name(fid).expect("Missing field name")); permissive_json_pointer::map_leaf_values(&mut document, displayable_names, |key, value| { // To get the formatting option of each key we need to see all the rules that applies // to the value and merge them together. eg. If a user said he wanted to highlight `doggo` // and crop `doggo.name`. `doggo.name` needs to be highlighted + cropped while `doggo.age` is only // highlighted. let format = formatted_options .iter() .filter(|(field, _option)| { let name = field_ids_map.name(**field).unwrap(); milli::is_faceted_by(name, key) || milli::is_faceted_by(key, name) }) .map(|(_, option)| *option) .reduce(|acc, option| acc.merge(option)); let mut infos = Vec::new(); *value = format_value( std::mem::take(value), builder, format, &mut infos, compute_matches, ); if let Some(matches) = matches_position.as_mut() { if !infos.is_empty() { matches.insert(key.to_owned(), infos); } } }); let selectors = formatted_options .keys() // This unwrap must be safe since we got the ids from the fields_ids_map just // before. .map(|&fid| field_ids_map.name(fid).unwrap()); let document = permissive_json_pointer::select_values(&document, selectors); Ok((matches_position, document)) } fn format_value<'a, A: AsRef<[u8]>>( value: Value, builder: &MatcherBuilder<'a, A>, format_options: Option, infos: &mut Vec, compute_matches: bool, ) -> Value { match value { Value::String(old_string) => { let mut matcher = builder.build(&old_string); if compute_matches { let matches = matcher.matches(); infos.extend_from_slice(&matches[..]); } match format_options { Some(format_options) => { let value = matcher.format(format_options); Value::String(value.into_owned()) } None => Value::String(old_string), } } Value::Array(values) => Value::Array( values .into_iter() .map(|v| { format_value( v, builder, format_options.map(|format_options| FormatOptions { highlight: format_options.highlight, crop: None, }), infos, compute_matches, ) }) .collect(), ), Value::Object(object) => Value::Object( object .into_iter() .map(|(k, v)| { ( k, format_value( v, builder, format_options.map(|format_options| FormatOptions { highlight: format_options.highlight, crop: None, }), infos, compute_matches, ), ) }) .collect(), ), Value::Number(number) => { let s = number.to_string(); let mut matcher = builder.build(&s); if compute_matches { let matches = matcher.matches(); infos.extend_from_slice(&matches[..]); } match format_options { Some(format_options) => { let value = matcher.format(format_options); Value::String(value.into_owned()) } None => Value::Number(number), } } value => value, } } fn parse_filter(facets: &Value) -> Result, MeilisearchHttpError> { match facets { Value::String(expr) => { let condition = Filter::from_str(expr)?; Ok(condition) } Value::Array(arr) => parse_filter_array(arr), v => Err(MeilisearchHttpError::InvalidExpression(&["Array"], v.clone()).into()), } } fn parse_filter_array(arr: &[Value]) -> Result, MeilisearchHttpError> { let mut ands = Vec::new(); for value in arr { match value { Value::String(s) => ands.push(Either::Right(s.as_str())), Value::Array(arr) => { let mut ors = Vec::new(); for value in arr { match value { Value::String(s) => ors.push(s.as_str()), v => { return Err(MeilisearchHttpError::InvalidExpression( &["String"], v.clone(), ) .into()) } } } ands.push(Either::Left(ors)); } v => { return Err(MeilisearchHttpError::InvalidExpression( &["String", "[String]"], v.clone(), ) .into()) } } } Ok(Filter::from_array(ands)?) } #[cfg(test)] mod test { use super::*; #[test] fn test_insert_geo_distance() { let value: Document = serde_json::from_str( r#"{ "_geo": { "lat": 50.629973371633746, "lng": 3.0569447399419567 }, "city": "Lille", "id": "1" }"#, ) .unwrap(); let sorters = &["_geoPoint(50.629973371633746,3.0569447399419567):desc".to_string()]; let mut document = value.clone(); insert_geo_distance(sorters, &mut document); assert_eq!(document.get("_geoDistance"), Some(&json!(0))); let sorters = &["_geoPoint(50.629973371633746, 3.0569447399419567):asc".to_string()]; let mut document = value.clone(); insert_geo_distance(sorters, &mut document); assert_eq!(document.get("_geoDistance"), Some(&json!(0))); let sorters = &["_geoPoint( 50.629973371633746 , 3.0569447399419567 ):desc".to_string()]; let mut document = value.clone(); insert_geo_distance(sorters, &mut document); assert_eq!(document.get("_geoDistance"), Some(&json!(0))); let sorters = &[ "prix:asc", "villeneuve:desc", "_geoPoint(50.629973371633746, 3.0569447399419567):asc", "ubu:asc", ] .map(|s| s.to_string()); let mut document = value.clone(); insert_geo_distance(sorters, &mut document); assert_eq!(document.get("_geoDistance"), Some(&json!(0))); // only the first geoPoint is used to compute the distance let sorters = &[ "chien:desc", "_geoPoint(50.629973371633746, 3.0569447399419567):asc", "pangolin:desc", "_geoPoint(100.0, -80.0):asc", "chat:asc", ] .map(|s| s.to_string()); let mut document = value.clone(); insert_geo_distance(sorters, &mut document); assert_eq!(document.get("_geoDistance"), Some(&json!(0))); // there was no _geoPoint so nothing is inserted in the document let sorters = &["chien:asc".to_string()]; let mut document = value; insert_geo_distance(sorters, &mut document); assert_eq!(document.get("_geoDistance"), None); } }