steffo/distributed-arcade
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Use optimistic locking in Redis

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Fixes #2.
This commit is contained in:
Steffo 2023-02-28 21:18:55 +01:00
parent e7521147f2
commit 9f6381071e
Signed by: steffo
GPG key ID: 2A24051445686895
1 changed files with 8 additions and 5 deletions
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13
src/routes/board.rs
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@ -64,7 +64,7 @@ async fn ensure_key_is_empty(rconn: &mut redis::aio::Connection, key: &str) -> R
.map_err(outcome::redis_cmd_failed)? .map_err(outcome::redis_cmd_failed)?
.eq("none") .eq("none")
.then_some(()) .then_some(())
.ok_or((StatusCode::CONFLICT, outcome::req_error!("Board already exists"))) .ok_or_else(|| (StatusCode::CONFLICT, outcome::req_error!("Board already exists")))
} }
/// Handler for `GET /board/`. /// Handler for `GET /board/`.
@ -140,16 +140,19 @@ pub(crate) async fn route_board_post(
let mut rconn = rclient.get_connection_or_504().await?; let mut rconn = rclient.get_connection_or_504().await?;
log::trace!("Watching board keys...");
redis::cmd("WATCH").arg(&order_key).arg(&token_key).arg(&scores_key).query_async(&mut rconn).await
.map_err(outcome::redis_cmd_failed)?;
log::trace!("Ensuring a board does not already exist..."); log::trace!("Ensuring a board does not already exist...");
ensure_key_is_empty(&mut rconn, &order_key).await?;
ensure_key_is_empty(&mut rconn, &token_key).await?;
ensure_key_is_empty(&mut rconn, &scores_key).await?;
log::trace!("Starting Redis transaction..."); log::trace!("Starting Redis transaction...");
redis::cmd("MULTI").query_async(&mut rconn).await redis::cmd("MULTI").query_async(&mut rconn).await
.map_err(outcome::redis_cmd_failed)?; .map_err(outcome::redis_cmd_failed)?;
ensure_key_is_empty(&mut rconn, &order_key).await?;
ensure_key_is_empty(&mut rconn, &token_key).await?;
ensure_key_is_empty(&mut rconn, &scores_key).await?;
let token = SecureToken::new_or_500()?; let token = SecureToken::new_or_500()?;
log::debug!("Creating board: {name:?}"); log::debug!("Creating board: {name:?}");