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await the mutex in db_run and use block_in_place for it's contents

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pull/2276/head
Daniel García 3 years ago
parent f38926d666
commit fd9693b961
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GPG Key ID: FC8A7D14C3CD543A
1 changed files with 28 additions and 71 deletions
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59
src/db/mod.rs
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@ -206,87 +206,44 @@ macro_rules! db_run {
// Different code for each db
( $conn:ident: $( $($db:ident),+ $body:block )+ ) => {{
#[allow(unused)] use diesel::prelude::*;
#[allow(unused)] use crate::db::FromDb;
// It is important that this inner Arc<Mutex<>> (or the OwnedMutexGuard
// derived from it) never be a variable on the stack at an await point,
// where Drop might be called at any time. This causes (synchronous)
// Drop to be called from asynchronous code, which some database
// wrappers do not or can not handle.
let conn = $conn.conn.clone();
// Since connection can't be on the stack in an async fn during an
// await, we have to spawn a new blocking-safe thread...
/*
run_blocking(move || {
// And then re-enter the runtime to wait on the async mutex, but in
// a blocking fashion.
let mut conn = tokio::runtime::Handle::current().block_on(conn.lock_owned());
let conn = conn.as_mut().expect("internal invariant broken: self.connection is Some");
*/
let mut __conn_mutex = conn.try_lock_owned().unwrap();
let conn = __conn_mutex.as_mut().unwrap();
match conn {
let mut conn = conn.lock_owned().await;
match conn.as_mut().expect("internal invariant broken: self.connection is Some") {
$($(
#[cfg($db)]
crate::db::DbConnInner::$db($conn) => {
paste::paste! {
#[allow(unused)] use crate::db::[<__ $db _schema>]::{self as schema, *};
#[allow(unused)] use [<__ $db _model>]::*;
#[allow(unused)] use crate::db::FromDb;
}
/*
// Since connection can't be on the stack in an async fn during an
// await, we have to spawn a new blocking-safe thread...
run_blocking(move || {
// And then re-enter the runtime to wait on the async mutex, but in
// a blocking fashion.
let mut conn = tokio::runtime::Handle::current().block_on(async {
conn.lock_owned().await
});
let conn = conn.as_mut().expect("internal invariant broken: self.connection is Some");
f(conn)
}).await;*/
$body
tokio::task::block_in_place(move || { $body }) // Run blocking can't be used due to the 'static limitation, use block_in_place instead
},
)+)+
}
// }).await
}};
( @raw $conn:ident: $( $($db:ident),+ $body:block )+ ) => {{
#[allow(unused)] use diesel::prelude::*;
#[allow(unused)] use crate::db::FromDb;
// It is important that this inner Arc<Mutex<>> (or the OwnedMutexGuard
// derived from it) never be a variable on the stack at an await point,
// where Drop might be called at any time. This causes (synchronous)
// Drop to be called from asynchronous code, which some database
// wrappers do not or can not handle.
let conn = $conn.conn.clone();
// Since connection can't be on the stack in an async fn during an
// await, we have to spawn a new blocking-safe thread...
run_blocking(move || {
// And then re-enter the runtime to wait on the async mutex, but in
// a blocking fashion.
let mut conn = tokio::runtime::Handle::current().block_on(conn.lock_owned());
let mut conn = conn.lock_owned().await;
match conn.as_mut().expect("internal invariant broken: self.connection is Some") {
$($(
#[cfg($db)]
crate::db::DbConnInner::$db($conn) => {
paste::paste! {
#[allow(unused)] use crate::db::[<__ $db _schema>]::{self as schema, *};
// @RAW: #[allow(unused)] use [<__ $db _model>]::*;
#[allow(unused)] use crate::db::FromDb;
// @ RAW: #[allow(unused)] use [<__ $db _model>]::*;
}
$body
tokio::task::block_in_place(move || { $body }) // Run blocking can't be used due to the 'static limitation, use block_in_place instead
},
)+)+
}
}).await
}};
}

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