retrieve update status

src/data/search.rs

@@ -0,0 +1,156 @@
+use std::borrow::Cow;
+use std::collections::HashSet;
+use std::mem;
+use std::time::Instant;
+
+use serde_json::{Value, Map};
+use serde::{Deserialize, Serialize};
+use milli::{SearchResult as Results, obkv_to_json};
+use meilisearch_tokenizer::{Analyzer, AnalyzerConfig};
+
+use super::Data;
+
+const DEFAULT_SEARCH_LIMIT: usize = 20;
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase", deny_unknown_fields)]
+#[allow(dead_code)]
+pub struct SearchQuery {
+    q: Option<String>,
+    offset: Option<usize>,
+    limit: Option<usize>,
+    attributes_to_retrieve: Option<Vec<String>>,
+    attributes_to_crop: Option<Vec<String>>,
+    crop_length: Option<usize>,
+    attributes_to_highlight: Option<Vec<String>>,
+    filters: Option<String>,
+    matches: Option<bool>,
+    facet_filters: Option<Value>,
+    facets_distribution: Option<Vec<String>>,
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SearchResult {
+    hits: Vec<Map<String, Value>>,
+    nb_hits: usize,
+    query: String,
+    limit: usize,
+    offset: usize,
+    processing_time_ms: u128,
+}
+
+struct Highlighter<'a, A> {
+    analyzer: Analyzer<'a, A>,
+}
+
+impl<'a, A: AsRef<[u8]>> Highlighter<'a, A> {
+    fn new(stop_words: &'a fst::Set<A>) -> Self {
+        let analyzer = Analyzer::new(AnalyzerConfig::default_with_stopwords(stop_words));
+        Self { analyzer }
+    }
+
+    fn highlight_value(&self, value: Value, words_to_highlight: &HashSet<String>) -> Value {
+        match value {
+            Value::Null => Value::Null,
+            Value::Bool(boolean) => Value::Bool(boolean),
+            Value::Number(number) => Value::Number(number),
+            Value::String(old_string) => {
+                let mut string = String::new();
+                let analyzed = self.analyzer.analyze(&old_string);
+                for (word, token) in analyzed.reconstruct() {
+                    if token.is_word() {
+                        let to_highlight = words_to_highlight.contains(token.text());
+                        if to_highlight { string.push_str("<mark>") }
+                        string.push_str(word);
+                        if to_highlight { string.push_str("</mark>") }
+                    } else {
+                        string.push_str(word);
+                    }
+                }
+                Value::String(string)
+            },
+            Value::Array(values) => {
+                Value::Array(values.into_iter()
+                    .map(|v| self.highlight_value(v, words_to_highlight))
+                    .collect())
+            },
+            Value::Object(object) => {
+                Value::Object(object.into_iter()
+                    .map(|(k, v)| (k, self.highlight_value(v, words_to_highlight)))
+                    .collect())
+            },
+        }
+    }
+
+    fn highlight_record(
+        &self,
+        object: &mut Map<String, Value>,
+        words_to_highlight: &HashSet<String>,
+        attributes_to_highlight: &HashSet<String>,
+    ) {
+        // TODO do we need to create a string for element that are not and needs to be highlight?
+        for (key, value) in object.iter_mut() {
+            if attributes_to_highlight.contains(key) {
+                let old_value = mem::take(value);
+                *value = self.highlight_value(old_value, words_to_highlight);
+            }
+        }
+    }
+}
+
+impl Data {
+        pub fn search<S: AsRef<str>>(&self, _index: S, search_query: SearchQuery) -> anyhow::Result<SearchResult> {
+        let start =  Instant::now();
+        let index = &self.indexes;
+        let rtxn = index.read_txn()?;
+
+        let mut search = index.search(&rtxn);
+        if let Some(query) = &search_query.q {
+            search.query(query);
+        }
+
+        if let Some(offset) = search_query.offset {
+            search.offset(offset);
+        }
+
+        let limit = search_query.limit.unwrap_or(DEFAULT_SEARCH_LIMIT);
+            search.limit(limit);
+
+        let Results { found_words, documents_ids, nb_hits, .. } = search.execute().unwrap();
+
+        let fields_ids_map = index.fields_ids_map(&rtxn).unwrap();
+
+        let displayed_fields = match index.displayed_fields(&rtxn).unwrap() {
+            Some(fields) => Cow::Borrowed(fields),
+            None => Cow::Owned(fields_ids_map.iter().map(|(id, _)| id).collect()),
+        };
+
+        let attributes_to_highlight = match search_query.attributes_to_highlight {
+            Some(fields) => fields.iter().map(ToOwned::to_owned).collect(),
+            None => HashSet::new(),
+        };
+
+        let stop_words = fst::Set::default();
+        let highlighter = Highlighter::new(&stop_words);
+        let mut documents = Vec::new();
+        for (_id, obkv) in index.documents(&rtxn, documents_ids).unwrap() {
+            let mut object = obkv_to_json(&displayed_fields, &fields_ids_map, obkv).unwrap();
+            highlighter.highlight_record(&mut object, &found_words, &attributes_to_highlight);
+            documents.push(object);
+        }
+
+        let processing_time_ms = start.elapsed().as_millis();
+
+        let result = SearchResult {
+            hits: documents,
+            nb_hits,
+            query: search_query.q.unwrap_or_default(),
+            offset: search_query.offset.unwrap_or(0),
+            limit,
+            processing_time_ms,
+        };
+
+        Ok(result)
+    }
+}