typosquat: Asyncify all the things

src/typosquat/cache.rs

@@ -1,6 +1,5 @@
+use diesel_async::AsyncPgConnection;
 use std::sync::Arc;
-
-use crate::util::diesel::Conn;
 use thiserror::Error;
 use typomania::{
     checks::{Bitflips, Omitted, SwappedWords, Typos},
@@ -28,7 +27,7 @@ impl Cache {
     /// addresses to send notifications to, then invokes [`Cache::new`] to read popular crates from
     /// the database.
     #[instrument(skip_all, err)]
-    pub fn from_env(conn: &mut impl Conn) -> Result<Self, Error> {
+    pub async fn from_env(conn: &mut AsyncPgConnection) -> Result<Self, Error> {
         let emails: Vec<String> = crates_io_env_vars::var(NOTIFICATION_EMAILS_ENV)
             .map_err(|e| Error::Environment {
                 name: NOTIFICATION_EMAILS_ENV.into(),
@@ -49,15 +48,15 @@ impl Cache {
             })
         } else {
             // Otherwise, let's go get the top crates and build a corpus.
-            Self::new(emails, conn)
+            Self::new(emails, conn).await
         }
     }
 
     /// Instantiates a cache by querying popular crates and building them into a typomania harness.
     ///
     /// This relies on configuration in the `super::config` module.
-    pub fn new(emails: Vec<String>, conn: &mut impl Conn) -> Result<Self, Error> {
-        let top = TopCrates::new(conn, config::TOP_CRATES)?;
+    pub async fn new(emails: Vec<String>, conn: &mut AsyncPgConnection) -> Result<Self, Error> {
+        let top = TopCrates::new(conn, config::TOP_CRATES).await?;
 
         Ok(Self {
             emails,

src/typosquat/database.rs

@@ -5,8 +5,9 @@
     collections::{BTreeMap, HashMap, HashSet},
 };
 
-use crate::util::diesel::Conn;
-use diesel::{connection::DefaultLoadingMode, QueryResult};
+use crate::util::diesel::prelude::*;
+use diesel_async::{AsyncPgConnection, RunQueryDsl};
+use futures_util::TryStreamExt;
 use typomania::{AuthorSet, Corpus, Package};
 
 /// A corpus of the current top crates on crates.io, as determined by their download counts, along
@@ -18,12 +19,11 @@
 
 impl TopCrates {
     /// Retrieves the `num` top crates from the database.
-    pub fn new(conn: &mut impl Conn, num: i64) -> QueryResult<Self> {
+    pub async fn new(conn: &mut AsyncPgConnection, num: i64) -> QueryResult<Self> {
         use crate::{
             models,
             schema::{crate_downloads, crate_owners},
         };
-        use diesel::prelude::*;
 
         // We have to build up a data structure that contains the top crates, their owners in some
         // form that is easily compared, and that can be indexed by the crate name.
@@ -42,45 +42,51 @@
         // Once we have the results of those queries, we can glom it all together into one happy
         // data structure.
 
-        let mut crates: BTreeMap<i32, (String, Crate)> = BTreeMap::new();
-        for result in models::Crate::all()
+        let crates: BTreeMap<i32, (String, Crate)> = BTreeMap::new();
+        let crates = models::Crate::all()
             .inner_join(crate_downloads::table)
             .order(crate_downloads::downloads.desc())
             .limit(num)
-            .load_iter::<models::Crate, DefaultLoadingMode>(conn)?
-        {
-            let krate = result?;
-            crates.insert(
-                krate.id,
-                (
-                    krate.name,
-                    Crate {
-                        owners: HashSet::new(),
-                    },
-                ),
-            );
-        }
+            .load_stream::<models::Crate>(conn)
+            .await?
+            .try_fold(crates, |mut crates, krate| {
+                crates.insert(
+                    krate.id,
+                    (
+                        krate.name,
+                        Crate {
+                            owners: HashSet::new(),
+                        },
+                    ),
+                );
+
+                futures_util::future::ready(Ok(crates))
+            })
+            .await?;
 
         // This query might require more low level knowledge of crate_owners than we really want
         // outside of the models module. It would probably make more sense in the long term to have
         // this live in the Owner type, but for now I want to keep the typosquatting logic as
         // self-contained as possible in case we decide not to go ahead with this in the longer
         // term.
-        for result in crate_owners::table
+        let crates = crate_owners::table
             .filter(crate_owners::deleted.eq(false))
             .filter(crate_owners::crate_id.eq_any(crates.keys().cloned().collect::<Vec<_>>()))
             .select((
                 crate_owners::crate_id,
                 crate_owners::owner_id,
                 crate_owners::owner_kind,
             ))
-            .load_iter::<(i32, i32, i32), DefaultLoadingMode>(conn)?
-        {
-            let (crate_id, owner_id, owner_kind) = result?;
-            crates.entry(crate_id).and_modify(|(_name, krate)| {
-                krate.owners.insert(Owner::new(owner_id, owner_kind));
-            });
-        }
+            .load_stream::<(i32, i32, i32)>(conn)
+            .await?
+            .try_fold(crates, |mut crates, (crate_id, owner_id, owner_kind)| {
+                crates.entry(crate_id).and_modify(|(_name, krate)| {
+                    krate.owners.insert(Owner::new(owner_id, owner_kind));
+                });
+
+                futures_util::future::ready(Ok(crates))
+            })
+            .await?;
 
         Ok(Self {
             crates: crates.into_values().collect(),
@@ -104,12 +110,16 @@
 
 impl Crate {
     /// Hydrates a crate and its owners from the database given the crate name.
-    pub fn from_name(conn: &mut impl Conn, name: &str) -> QueryResult<Self> {
+    pub async fn from_name(conn: &mut AsyncPgConnection, name: &str) -> QueryResult<Self> {
         use crate::models;
-        use diesel::prelude::*;
 
-        let krate = models::Crate::by_exact_name(name).first(conn)?;
-        let owners = krate.owners(conn)?.into_iter().map(Owner::from).collect();
+        let krate = models::Crate::by_exact_name(name).first(conn).await?;
+        let owners = krate
+            .async_owners(conn)
+            .await?
+            .into_iter()
+            .map(Owner::from)
+            .collect();
 
         Ok(Self { owners })
     }
@@ -166,10 +176,11 @@
     use super::*;
     use crate::typosquat::test_util::faker;
     use crates_io_test_db::TestDatabase;
+    use diesel_async::AsyncConnection;
     use thiserror::Error;
 
-    #[test]
-    fn top_crates() -> Result<(), Error> {
+    #[tokio::test]
+    async fn top_crates() -> Result<(), Error> {
         let test_db = TestDatabase::new();
         let mut conn = test_db.connect();
 
@@ -187,7 +198,8 @@
         faker::add_crate_to_team(&mut conn, &user_b, &top_b, &not_the_a_team)?;
         faker::add_crate_to_team(&mut conn, &user_b, &not_top_c, &not_the_a_team)?;
 
-        let top_crates = TopCrates::new(&mut conn, 2)?;
+        let mut async_conn = AsyncPgConnection::establish(test_db.url()).await?;
+        let top_crates = TopCrates::new(&mut async_conn, 2).await?;
 
         // Let's ensure the top crates include what we expect (which is a and b, since we asked for
         // 2 crates and they're the most downloaded).
@@ -201,7 +213,7 @@
         assert!(!pkg_a.shared_authors(pkg_b.authors()));
 
         // Now let's go get package c and pretend it's a new package.
-        let pkg_c = Crate::from_name(&mut conn, "c")?;
+        let pkg_c = Crate::from_name(&mut async_conn, "c").await?;
 
         // c _does_ have an author in common with a.
         assert!(pkg_a.shared_authors(pkg_c.authors()));
@@ -227,5 +239,8 @@
 
         #[error(transparent)]
         Diesel(#[from] diesel::result::Error),
+
+        #[error(transparent)]
+        Connection(#[from] ConnectionError),
     }
 }

src/worker/environment.rs

@@ -2,7 +2,6 @@
 use crate::fastly::Fastly;
 use crate::storage::Storage;
 use crate::typosquat;
-use crate::util::diesel::Conn;
 use crate::Emails;
 use anyhow::Context;
 use bon::Builder;
@@ -13,8 +12,9 @@
 use object_store::ObjectStore;
 use parking_lot::{Mutex, MutexGuard};
 use std::ops::{Deref, DerefMut};
-use std::sync::{Arc, OnceLock};
+use std::sync::Arc;
 use std::time::Instant;
+use tokio::sync::OnceCell;
 
 #[derive(Builder)]
 pub struct Environment {
@@ -33,7 +33,7 @@
 
     /// A lazily initialised cache of the most popular crates ready to use in typosquatting checks.
     #[builder(skip)]
-    typosquat_cache: OnceLock<Result<typosquat::Cache, typosquat::CacheError>>,
+    typosquat_cache: OnceCell<Result<typosquat::Cache, typosquat::CacheError>>,
 }
 
 impl Environment {
@@ -78,9 +78,9 @@
     }
 
     /// Returns the typosquatting cache, initialising it if required.
-    pub(crate) fn typosquat_cache(
+    pub(crate) async fn typosquat_cache(
         &self,
-        conn: &mut impl Conn,
+        conn: &mut AsyncPgConnection,
     ) -> Result<&typosquat::Cache, typosquat::CacheError> {
         // We have to pass conn back in here because the caller might be in a transaction, and
         // getting a new connection here to query crates can result in a deadlock.
@@ -90,6 +90,7 @@
         // generated if initialising the cache fails.
         self.typosquat_cache
             .get_or_init(|| typosquat::Cache::from_env(conn))
+            .await
             .as_ref()
             .map_err(|e| e.clone())
     }

src/worker/jobs/typosquat.rs

@@ -1,12 +1,10 @@
 use std::sync::Arc;
 
 use crates_io_worker::BackgroundJob;
-use diesel_async::async_connection_wrapper::AsyncConnectionWrapper;
+use diesel_async::AsyncPgConnection;
 use typomania::Package;
 
 use crate::email::Email;
-use crate::tasks::spawn_blocking;
-use crate::util::diesel::Conn;
 use crate::{
     typosquat::{Cache, Crate},
     worker::Environment,
@@ -36,22 +34,23 @@ impl BackgroundJob for CheckTyposquat {
     async fn run(&self, env: Self::Context) -> anyhow::Result<()> {
         let crate_name = self.name.clone();
 
-        let conn = env.deadpool.get().await?;
-        spawn_blocking(move || {
-            let conn: &mut AsyncConnectionWrapper<_> = &mut conn.into();
+        let mut conn = env.deadpool.get().await?;
 
-            let cache = env.typosquat_cache(conn)?;
-            check(&env.emails, cache, conn, &crate_name)
-        })
-        .await
+        let cache = env.typosquat_cache(&mut conn).await?;
+        check(&env.emails, cache, &mut conn, &crate_name).await
     }
 }
 
-fn check(emails: &Emails, cache: &Cache, conn: &mut impl Conn, name: &str) -> anyhow::Result<()> {
+async fn check(
+    emails: &Emails,
+    cache: &Cache,
+    conn: &mut AsyncPgConnection,
+    name: &str,
+) -> anyhow::Result<()> {
     if let Some(harness) = cache.get_harness() {
         info!(name, "Checking new crate for potential typosquatting");
 
-        let krate: Box<dyn Package> = Box::new(Crate::from_name(conn, name)?);
+        let krate: Box<dyn Package> = Box::new(Crate::from_name(conn, name).await?);
         let squats = harness.check_package(name, krate)?;
         if !squats.is_empty() {
             // Well, well, well. For now, the only action we'll take is to e-mail people who
@@ -65,7 +64,7 @@ fn check(emails: &Emails, cache: &Cache, conn: &mut impl Conn, name: &str) -> an
             };
 
             for recipient in cache.iter_emails() {
-                if let Err(error) = emails.send(recipient, email.clone()) {
+                if let Err(error) = emails.async_send(recipient, email.clone()).await {
                     error!(
                         ?error,
                         ?recipient,
@@ -125,6 +124,7 @@ mod tests {
     use super::*;
     use crate::typosquat::test_util::faker;
     use crates_io_test_db::TestDatabase;
+    use diesel_async::AsyncConnection;
     use lettre::Address;
 
     #[tokio::test]
@@ -138,7 +138,8 @@ mod tests {
         faker::crate_and_version(&mut conn, "my-crate", "It's awesome", &user, 100)?;
 
         // Prime the cache so it only includes the crate we just created.
-        let cache = Cache::new(vec!["admin@example.com".to_string()], &mut conn)?;
+        let mut async_conn = AsyncPgConnection::establish(test_db.url()).await?;
+        let cache = Cache::new(vec!["admin@example.com".to_string()], &mut async_conn).await?;
         let cache = Arc::new(cache);
 
         // Now we'll create new crates: one problematic, one not so.
@@ -159,24 +160,11 @@ mod tests {
         )?;
 
         // Run the check with a crate that shouldn't cause problems.
-        let mut conn = spawn_blocking({
-            let emails = emails.clone();
-            let cache = cache.clone();
-            move || {
-                check(&emails, &cache, &mut conn, &angel.name)?;
-                Ok::<_, anyhow::Error>(conn)
-            }
-        })
-        .await?;
+        check(&emails, &cache, &mut async_conn, &angel.name).await?;
         assert!(emails.mails_in_memory().await.unwrap().is_empty());
 
         // Now run the check with a less innocent crate.
-        spawn_blocking({
-            let emails = emails.clone();
-            let cache = cache.clone();
-            move || check(&emails, &cache, &mut conn, &demon.name)
-        })
-        .await?;
+        check(&emails, &cache, &mut async_conn, &demon.name).await?;
         let sent_mail = emails.mails_in_memory().await.unwrap();
         assert!(!sent_mail.is_empty());
         let sent = sent_mail.into_iter().next().unwrap();