chore(tvix/store): Use BoxStream type alias

The BoxStream type alias is a more concise and easier to read than
the full `Pin<Box<dyn Stream<Item = ...> + Send + ...>>` type.

Change-Id: I5b7bccfd066ded5557e01f7895f4cf5c4a33bd44
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10677
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: Connor Brewster <cbrewster@hey.com>

tvix/store/src/pathinfoservice/fs/mod.rs

@@ -1,6 +1,5 @@
-use futures::Stream;
+use futures::stream::BoxStream;
 use futures::StreamExt;
-use std::pin::Pin;
 use tonic::async_trait;
 use tvix_castore::fs::{RootNodes, TvixStoreFs};
 use tvix_castore::proto as castorepb;
@@ -66,7 +65,7 @@ where
             }))
     }
 
-    fn list(&self) -> Pin<Box<dyn Stream<Item = Result<castorepb::node::Node, Error>> + Send>> {
+    fn list(&self) -> BoxStream<Result<castorepb::node::Node, Error>> {
         Box::pin(self.0.as_ref().list().map(|result| {
             result.map(|path_info| {
                 path_info

tvix/store/src/pathinfoservice/grpc.rs

@@ -1,8 +1,7 @@
 use super::PathInfoService;
 use crate::proto::{self, ListPathInfoRequest, PathInfo};
 use async_stream::try_stream;
-use futures::Stream;
-use std::pin::Pin;
+use futures::stream::BoxStream;
 use tonic::{async_trait, transport::Channel, Code};
 use tvix_castore::{proto as castorepb, Error};
 
@@ -87,7 +86,7 @@ impl PathInfoService for GRPCPathInfoService {
         Ok((path_info.nar_size, nar_sha256))
     }
 
-    fn list(&self) -> Pin<Box<dyn Stream<Item = Result<PathInfo, Error>> + Send>> {
+    fn list(&self) -> BoxStream<'static, Result<PathInfo, Error>> {
         let mut grpc_client = self.grpc_client.clone();
 
         let stream = try_stream! {

tvix/store/src/pathinfoservice/memory.rs

@@ -1,9 +1,8 @@
 use super::PathInfoService;
 use crate::{nar::calculate_size_and_sha256, proto::PathInfo};
-use futures::{stream::iter, Stream};
+use futures::stream::{iter, BoxStream};
 use std::{
     collections::HashMap,
-    pin::Pin,
     sync::{Arc, RwLock},
 };
 use tonic::async_trait;
@@ -71,7 +70,7 @@ where
             .map_err(|e| Error::StorageError(e.to_string()))
     }
 
-    fn list(&self) -> Pin<Box<dyn Stream<Item = Result<PathInfo, Error>> + Send>> {
+    fn list(&self) -> BoxStream<'static, Result<PathInfo, Error>> {
         let db = self.db.read().unwrap();
 
         // Copy all elements into a list.

tvix/store/src/pathinfoservice/mod.rs

@@ -7,8 +7,7 @@ mod sled;
 #[cfg(any(feature = "fuse", feature = "virtiofs"))]
 mod fs;
 
-use futures::Stream;
-use std::pin::Pin;
+use futures::stream::BoxStream;
 use tonic::async_trait;
 use tvix_castore::proto as castorepb;
 use tvix_castore::Error;
@@ -49,5 +48,5 @@ pub trait PathInfoService: Send + Sync {
     /// and the box allows different underlying stream implementations to be returned since
     /// Rust doesn't support this as a generic in traits yet. This is the same thing that
     /// [async_trait] generates, but for streams instead of futures.
-    fn list(&self) -> Pin<Box<dyn Stream<Item = Result<PathInfo, Error>> + Send>>;
+    fn list(&self) -> BoxStream<'static, Result<PathInfo, Error>>;
 }

tvix/store/src/pathinfoservice/nix_http.rs

@@ -1,10 +1,7 @@
-use std::{
-    io::{self, BufRead, Read, Write},
-    pin::Pin,
-};
+use std::io::{self, BufRead, Read, Write};
 
 use data_encoding::BASE64;
-use futures::{Stream, TryStreamExt};
+use futures::{stream::BoxStream, TryStreamExt};
 use nix_compat::{
     narinfo::{self, NarInfo},
     nixbase32,
@@ -270,7 +267,7 @@ where
         ))
     }
 
-    fn list(&self) -> Pin<Box<dyn Stream<Item = Result<PathInfo, Error>> + Send>> {
+    fn list(&self) -> BoxStream<'static, Result<PathInfo, Error>> {
         Box::pin(futures::stream::once(async {
             Err(Error::InvalidRequest(
                 "list not supported for this backend".to_string(),

tvix/store/src/pathinfoservice/sled.rs

@@ -1,9 +1,10 @@
 use super::PathInfoService;
 use crate::nar::calculate_size_and_sha256;
 use crate::proto::PathInfo;
-use futures::{stream::iter, Stream};
+use futures::stream::iter;
+use futures::stream::BoxStream;
 use prost::Message;
-use std::{path::Path, pin::Pin};
+use std::path::Path;
 use tonic::async_trait;
 use tracing::warn;
 use tvix_castore::proto as castorepb;
@@ -112,7 +113,7 @@ where
             .map_err(|e| Error::StorageError(e.to_string()))
     }
 
-    fn list(&self) -> Pin<Box<dyn Stream<Item = Result<PathInfo, Error>> + Send>> {
+    fn list(&self) -> BoxStream<'static, Result<PathInfo, Error>> {
         Box::pin(iter(self.db.iter().values().map(|v| match v {
             Ok(data) => {
                 // we retrieved some bytes