Changes to multi_search route

meilisearch/src/routes/multi_search.rs

@@ -10,12 +10,14 @@ use serde::Serialize;
 use tracing::debug;
 
 use crate::analytics::{Analytics, MultiSearchAggregator};
+use crate::error::MeilisearchHttpError;
 use crate::extractors::authentication::policies::ActionPolicy;
 use crate::extractors::authentication::{AuthenticationError, GuardedData};
 use crate::extractors::sequential_extractor::SeqHandler;
 use crate::routes::indexes::search::search_kind;
 use crate::search::{
-    add_search_rules, perform_search, RetrieveVectors, SearchQueryWithIndex, SearchResultWithIndex,
+    add_search_rules, perform_federated_search, perform_search, FederatedSearch, RetrieveVectors,
+    SearchQueryWithIndex, SearchResultWithIndex,
 };
 use crate::search_queue::SearchQueue;
 
@@ -28,46 +30,86 @@ struct SearchResults {
     results: Vec<SearchResultWithIndex>,
 }
 
-#[derive(Debug, deserr::Deserr)]
-#[deserr(error = DeserrJsonError, rename_all = camelCase, deny_unknown_fields)]
-pub struct SearchQueries {
-    queries: Vec<SearchQueryWithIndex>,
-}
-
 pub async fn multi_search_with_post(
     index_scheduler: GuardedData<ActionPolicy<{ actions::SEARCH }>, Data<IndexScheduler>>,
     search_queue: Data<SearchQueue>,
-    params: AwebJson<SearchQueries, DeserrJsonError>,
+    params: AwebJson<FederatedSearch, DeserrJsonError>,
     req: HttpRequest,
     analytics: web::Data<dyn Analytics>,
 ) -> Result<HttpResponse, ResponseError> {
-    let queries = params.into_inner().queries;
-
-    let mut multi_aggregate = MultiSearchAggregator::from_queries(&queries, &req);
-    let features = index_scheduler.features();
-
     // Since we don't want to process half of the search requests and then get a permit refused
     // we're going to get one permit for the whole duration of the multi-search request.
     let _permit = search_queue.try_get_search_permit().await?;
 
+    let federated_search = params.into_inner();
+
+    let mut multi_aggregate = MultiSearchAggregator::from_federated_search(&federated_search, &req);
+
+    let FederatedSearch { mut queries, federation } = federated_search;
+
+    let features = index_scheduler.features();
+
+    // regardless of federation, check authorization and apply search rules
+    let auth = 'check_authorization: {
+        for (query_index, federated_query) in queries.iter_mut().enumerate() {
+            let index_uid = federated_query.index_uid.as_str();
+            // Check index from API key
+            if !index_scheduler.filters().is_index_authorized(index_uid) {
+                break 'check_authorization Err(AuthenticationError::InvalidToken)
+                    .with_index(query_index);
+            }
+            // Apply search rules from tenant token
+            if let Some(search_rules) = index_scheduler.filters().get_index_search_rules(index_uid)
+            {
+                add_search_rules(&mut federated_query.filter, search_rules);
+            }
+        }
+        Ok(())
+    };
+
+    auth.map_err(|(mut err, query_index)| {
+        // Add the query index that failed as context for the error message.
+        // We're doing it only here and not directly in the `WithIndex` trait so that the `with_index` function returns a different type
+        // of result and we can benefit from static typing.
+        err.message = format!("Inside `.queries[{query_index}]`: {}", err.message);
+        err
+    })?;
+
+    let response = match federation {
+        Some(federation) => {
+            let search_result = tokio::task::spawn_blocking(move || {
+                perform_federated_search(&index_scheduler, queries, federation, features)
+            })
+            .await;
+
+            if let Ok(Ok(_)) = search_result {
+                multi_aggregate.succeed();
+            }
+
+            analytics.post_multi_search(multi_aggregate);
+            HttpResponse::Ok().json(search_result??)
+        }
+        None => {
             // Explicitly expect a `(ResponseError, usize)` for the error type rather than `ResponseError` only,
             // so that `?` doesn't work if it doesn't use `with_index`, ensuring that it is not forgotten in case of code
             // changes.
             let search_results: Result<_, (ResponseError, usize)> = async {
                 let mut search_results = Vec::with_capacity(queries.len());
-        for (query_index, (index_uid, mut query)) in
-            queries.into_iter().map(SearchQueryWithIndex::into_index_query).enumerate()
+                for (query_index, (index_uid, query, federation_options)) in queries
+                    .into_iter()
+                    .map(SearchQueryWithIndex::into_index_query_federation)
+                    .enumerate()
                 {
                     debug!(on_index = query_index, parameters = ?query, "Multi-search");
 
-            // Check index from API key
-            if !index_scheduler.filters().is_index_authorized(&index_uid) {
-                return Err(AuthenticationError::InvalidToken).with_index(query_index);
-            }
-            // Apply search rules from tenant token
-            if let Some(search_rules) = index_scheduler.filters().get_index_search_rules(&index_uid)
-            {
-                add_search_rules(&mut query.filter, search_rules);
+                    if federation_options.is_some() {
+                        return Err((
+                            MeilisearchHttpError::FederationOptionsInNonFederatedRequest(
+                                query_index,
+                            )
+                            .into(),
+                            query_index,
+                        ));
                     }
 
                     let index = index_scheduler
@@ -81,10 +123,11 @@ pub async fn multi_search_with_post(
                         })
                         .with_index(query_index)?;
 
-            let search_kind = search_kind(&query, index_scheduler.get_ref(), &index, features)
+                    let search_kind =
+                        search_kind(&query, index_scheduler.get_ref(), &index, features)
+                            .with_index(query_index)?;
+                    let retrieve_vector = RetrieveVectors::new(query.retrieve_vectors, features)
                         .with_index(query_index)?;
-            let retrieve_vector =
-                RetrieveVectors::new(query.retrieve_vectors, features).with_index(query_index)?;
 
                     let search_result = tokio::task::spawn_blocking(move || {
                         perform_search(&index, query, search_kind, retrieve_vector)
@@ -116,7 +159,11 @@ pub async fn multi_search_with_post(
 
             debug!(returns = ?search_results, "Multi-search");
 
-    Ok(HttpResponse::Ok().json(SearchResults { results: search_results }))
+            HttpResponse::Ok().json(SearchResults { results: search_results })
+        }
+    };
+
+    Ok(response)
 }
 
 /// Local `Result` extension trait to avoid `map_err` boilerplate.