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Code Issues Releases Wiki Activity

handle the case of a queue of zero elements

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This commit is contained in:
Tamo 2024-03-26 19:04:39 +01:00
parent e7704f1fc1
commit 8127c9a115
2 changed files with 46 additions and 2 deletions
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11
meilisearch/src/search_queue.rs
View File

@ -47,14 +47,21 @@ impl SearchQueue {
loop {
tokio::select! {
search_request = receive_new_searches.recv() => {
// this unwrap is safe because we're sure the `SearchQueue` still lives somewhere in actix-web
let search_request = search_request.unwrap();
if searches_running < usize::from(parallelism) && queue.is_empty() {
searches_running += 1;
// if the search requests die it's not a hard error on our side
let _ = search_request.send(Permit { sender: sender.clone() });
continue;
}
if queue.len() >= capacity {
} else if capacity == 0 {
// in the very specific case where we have a capacity of zero
// we must refuse the request straight away without going through
// the queue stuff.
drop(search_request);
continue;
} else if queue.len() >= capacity {
let remove = rng.gen_range(0..queue.len());
let thing = queue.swap_remove(remove); // this will drop the channel and notify the search that it won't be processed
drop(thing);

37
meilisearch/tests/search/search_queue.rs
View File

@ -131,3 +131,40 @@ async fn search_request_crashes_while_holding_permits() {
.expect("I should get a permit straight away")
.unwrap();
}
#[actix_rt::test]
async fn works_with_capacity_of_zero() {
let queue = Arc::new(SearchQueue::new(0, NonZeroUsize::new(1).unwrap()));
// First, use the whole capacity of the
let permit1 = tokio::time::timeout(Duration::from_secs(1), queue.try_get_search_permit())
.await
.expect("I should get a permit straight away")
.unwrap();
// then we should get an error if we try to register a second search request.
let permit2 = tokio::time::timeout(Duration::from_secs(1), queue.try_get_search_permit())
.await
.expect("I should get a result straight away");
let err = meilisearch_types::error::ResponseError::from(permit2.unwrap_err());
let http_response = err.error_response();
snapshot!(format!("{:?}", http_response.headers()), @r###"HeaderMap { inner: {"content-type": Value { inner: ["application/json"] }, "retry-after": Value { inner: ["10"] }} }"###);
let err = serde_json::to_string_pretty(&err).unwrap();
snapshot!(err, @r###"
{
"message": "Too many search requests running at the same time: 0. Retry after 10s.",
"code": "too_many_search_requests",
"type": "system",
"link": "https://docs.meilisearch.com/errors#too_many_search_requests"
}
"###);
drop(permit1);
// After dropping the first permit we should be able to get a new permit
let _permit3 = tokio::time::timeout(Duration::from_secs(1), queue.try_get_search_permit())
.await
.expect("I should get a permit straight away")
.unwrap();
}