we are doomed with static types

src/mail/incoming.rs

@@ -23,6 +23,7 @@ use crate::mail::unique_ident::*;
 use crate::mail::user::User;
 use crate::mail::IMF;
 use crate::time::now_msec;
+use crate::storage::Sto;
 
 const INCOMING_PK: &str = "incoming";
 const INCOMING_LOCK_SK: &str = "lock";
@@ -139,14 +140,14 @@ async fn incoming_mail_watch_process_internal(
     Ok(())
 }
 
-async fn handle_incoming_mail(
+async fn handle_incoming_mail<X: Sto>(
     user: &Arc<User>,
     s3: &S3Client,
     inbox: &Arc<Mailbox>,
     lock_held: &watch::Receiver<bool>,
 ) -> Result<()> {
     let lor = ListObjectsV2Request {
-        bucket: user.creds.storage.bucket.clone(),
+        bucket: user.creds.storage.engine::<X>().bucket.clone(),
         max_keys: Some(1000),
         prefix: Some("incoming/".into()),
         ..Default::default()

src/mail/user.rs

@@ -30,8 +30,6 @@ pub const INBOX: &str = "INBOX";
 const MAILBOX_LIST_PK: &str = "mailboxes";
 const MAILBOX_LIST_SK: &str = "list";
 
-use crate::storage::*;
-
 pub struct User {
     pub username: String,
     pub creds: Credentials,

src/storage/mod.rs

@@ -36,8 +36,8 @@ pub trait Sto: Sized {
 }
 
 pub struct Engine<T: Sto> {
-    bucket: String,
-    row: T::Builder,
+    pub bucket: String,
+    pub row: T::Builder,
 }
 
 pub enum AnyEngine {
@@ -45,7 +45,7 @@ pub enum AnyEngine {
     Garage(Engine<garage::GrgTypes>),
 }
 impl AnyEngine {
-    fn engine<X: Sto>(&self) -> &Engine<X> {
+    pub fn engine<X: Sto>(&self) -> &Engine<X> {
         match self {
             Self::InMemory(x) => x,
             Self::Garage(x) => x,