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fix: retry event writes if DB is busy

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This commit is contained in:
Greg Heartsfield 2023-02-15 18:37:13 -06:00
parent 35a1973a46
commit 136e41d234
1 changed files with 23 additions and 2 deletions
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25
src/repo/sqlite.rs
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@ -1,7 +1,7 @@
//! Event persistence and querying
//use crate::config::SETTINGS;
use crate::config::Settings;
use crate::error::Result;
use crate::error::{Result,Error::SqlError};
use crate::event::{single_char_tagname, Event};
use crate::hexrange::hex_range;
use crate::hexrange::HexSearch;
@ -264,6 +264,8 @@ impl NostrRepo for SqliteRepo {
/// Persist event to database
async fn write_event(&self, e: &Event) -> Result<u64> {
let start = Instant::now();
let max_write_attempts = 10;
let mut attempts = 0;
let _write_guard = self.write_in_progress.lock().await;
// spawn a blocking thread
//let mut conn = self.write_pool.get()?;
@ -271,7 +273,26 @@ impl NostrRepo for SqliteRepo {
let e = e.clone();
let event_count = task::spawn_blocking(move || {
let mut conn = pool.get()?;
SqliteRepo::persist_event(&mut conn, &e)
// this could fail because the database was busy; try
// multiple times before giving up.
loop {
attempts+=1;
let wr = SqliteRepo::persist_event(&mut conn, &e);
match wr {
Err(SqlError(rusqlite::Error::SqliteFailure(e,_))) => {
// this basically means that NIP-05 was
// writing to the database between us reading
// and promoting the connection to a write
// lock.
info!("event write failed, DB locked (attempt: {}); sqlite err: {}",
attempts, e.extended_code);
},
_ => {return wr;},
}
if attempts >= max_write_attempts {
return wr;
}
}
}).await?;
self.metrics
.write_events