sausage-vfs: layers (host, memory, generated, mounts), process guards, wasi:filesystem adapter

Checkpoint. More tests and the review findings follow.
2026-10-23 00:08:02 +01:00
parent 01712e745a
commit 0a479b5800
15 changed files with 1932 additions and 1 deletions
@@ -0,0 +1,67 @@
+//! Exercises adapter streams with the shared WASI resource table.
+use sausage_vfs::{
+    adapter::{Adapter, View},
+    *,
+};
+use std::sync::Arc;
+use wasmtime::component::{Resource, ResourceTable};
+use wasmtime_wasi::p2::{
+    StreamError,
+    bindings::filesystem::{
+        preopens::Host,
+        types::{DescriptorFlags, HostDescriptor, OpenFlags, PathFlags},
+    },
+};
+#[tokio::test]
+async fn adapter_streams() {
+    let mut mounts = Mounts::default();
+    mounts.mount("/", Arc::new(Memory::default()), false);
+    let mut adapter = Adapter::new(mounts);
+    let mut table = ResourceTable::new();
+    let mut view = View {
+        adapter: &mut adapter,
+        table: &mut table,
+    };
+    let root = view.get_directories().unwrap().remove(0).0;
+    let fd = view
+        .open_at(
+            root,
+            PathFlags::empty(),
+            "file".into(),
+            OpenFlags::CREATE,
+            DescriptorFlags::READ | DescriptorFlags::WRITE,
+        )
+        .await
+        .unwrap();
+    let output = view
+        .write_via_stream(Resource::new_borrow(fd.rep()), 2)
+        .unwrap();
+    {
+        let stream = view.table.get_mut(&output).unwrap();
+        assert!(stream.check_write().unwrap() > 0);
+        stream.write(b"abc".as_slice().to_vec().into()).unwrap();
+        stream.flush().unwrap();
+        stream.ready().await;
+        assert!(stream.check_write().unwrap() > 0);
+    }
+    let append = view
+        .append_via_stream(Resource::new_borrow(fd.rep()))
+        .unwrap();
+    {
+        let stream = view.table.get_mut(&append).unwrap();
+        stream.write(b"!".as_slice().to_vec().into()).unwrap();
+        stream.ready().await;
+    }
+    let input = view
+        .read_via_stream(Resource::new_borrow(fd.rep()), 0)
+        .unwrap();
+    let stream = view.table.get_mut(&input).unwrap();
+    assert_eq!(
+        stream.blocking_read(100).await.unwrap().as_ref(),
+        b"\0\0abc!"
+    );
+    assert!(matches!(
+        stream.blocking_read(100).await,
+        Err(StreamError::Closed)
+    ));
+}