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improvement: log slow requests that return zero results

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This commit is contained in:
Greg Heartsfield 2022-12-18 13:42:31 -06:00
parent b24d2f9aaa
commit 677b7d39e9
1 changed files with 32 additions and 27 deletions
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25
src/db.rs
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@ -636,9 +636,11 @@ pub async fn db_query(
query_tx: tokio::sync::mpsc::Sender<QueryResult>,
mut abandon_query_rx: tokio::sync::oneshot::Receiver<()>,
) {
task::spawn_blocking(move || {
let mut row_count: usize = 0;
let start = Instant::now();
task::spawn_blocking(move || {
debug!("moved DB query to thread in {:?}", start.elapsed());
let start = Instant::now();
let mut row_count: usize = 0;
// generate SQL query
let (q, p) = query_from_sub(&sub);
debug!("SQL generated in {:?}", start.elapsed());
@ -647,16 +649,25 @@ pub async fn db_query(
// cutoff for displaying slow queries
let slow_cutoff = Duration::from_millis(1000);
let start = Instant::now();
let mut slow_first_event;
if let Ok(conn) = pool.get() {
// execute the query. Don't cache, since queries vary so much.
let mut stmt = conn.prepare(&q)?;
let mut event_rows = stmt.query(rusqlite::params_from_iter(p))?;
let mut first_result = true;
while let Some(row) = event_rows.next()? {
let first_event_elapsed = start.elapsed();
slow_first_event = first_event_elapsed >= slow_cutoff;
if first_result {
let first_result_elapsed = start.elapsed();
debug!(
"first result in {:?} (cid: {}, sub: {:?})",
first_event_elapsed, client_id, sub.id
);
first_result = false;
}
// logging for slow queries; show sub and SQL
if first_result_elapsed >= slow_cutoff {
//
if slow_first_event {
info!(
"query req (slow): {:?} (cid: {}, sub: {:?})",
sub, client_id, sub.id
@ -679,12 +690,6 @@ pub async fn db_query(
sub.id
);
}
debug!(
"first result in {:?} (cid: {}, sub: {:?})",
first_result_elapsed, client_id, sub.id
);
first_result = false;
}
// check if this is still active
// TODO: check every N rows
if abandon_query_rx.try_recv().is_ok() {