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improvement: move reader mutex closer to DB connection acquisition

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This commit is contained in:
Greg Heartsfield 2022-12-27 10:28:56 -06:00
parent d2adddaee4
commit 27902bc5f4
2 changed files with 6 additions and 6 deletions
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5
src/db.rs
View File

@ -762,9 +762,14 @@ pub async fn db_query(
pool: SqlitePool, pool: SqlitePool,
query_tx: tokio::sync::mpsc::Sender<QueryResult>, query_tx: tokio::sync::mpsc::Sender<QueryResult>,
mut abandon_query_rx: tokio::sync::oneshot::Receiver<()>, mut abandon_query_rx: tokio::sync::oneshot::Receiver<()>,
safe_to_read: Arc<Mutex<u64>>,
) { ) {
let pre_spawn_start = Instant::now(); let pre_spawn_start = Instant::now();
task::spawn_blocking(move || { task::spawn_blocking(move || {
{
// if we are waiting on a checkpoint, stop until it is complete
let _ = safe_to_read.blocking_lock();
}
let db_queue_time = pre_spawn_start.elapsed(); let db_queue_time = pre_spawn_start.elapsed();
// if the queue time was very long (>5 seconds), spare the DB and abort. // if the queue time was very long (>5 seconds), spare the DB and abort.
if db_queue_time > Duration::from_secs(5) { if db_queue_time > Duration::from_secs(5) {

7
src/server.rs
View File

@ -687,13 +687,8 @@ async fn nostr_server(
previous_query.send(()).ok(); previous_query.send(()).ok();
} }
if s.needs_historical_events() { if s.needs_historical_events() {
{
// acquire and immediately release lock; this ensures we do not start new queries during a wal checkpoint.
let _ = safe_to_read.lock().await;
trace!("passed safe_to_read lock");
}
// start a database query. this spawns a blocking database query on a worker thread. // start a database query. this spawns a blocking database query on a worker thread.
db::db_query(s, cid.to_owned(), pool.clone(), query_tx.clone(), abandon_query_rx).await; db::db_query(s, cid.to_owned(), pool.clone(), query_tx.clone(), abandon_query_rx,safe_to_read.clone()).await;
} }
}, },
Err(e) => { Err(e) => {