Major Subsystem Rewrite (Reconciler Mk5) (#217)

server/src/snapshot_middleware/middleware.rs

@@ -0,0 +1,39 @@
+use std::{
+    path::{PathBuf, Path},
+};
+
+use rbx_dom_weak::{RbxTree, RbxId};
+
+use crate::{
+    imfs::{
+        FsResult,
+        new::{
+            Imfs,
+            ImfsEntry,
+            ImfsFetcher,
+            ImfsSnapshot,
+        },
+    },
+    snapshot::InstanceSnapshot,
+};
+
+pub type SnapshotInstanceResult<'a> = FsResult<Option<InstanceSnapshot<'a>>>;
+pub type SnapshotFileResult = Option<(String, ImfsSnapshot)>;
+
+pub trait SnapshotMiddleware {
+    fn from_imfs<F: ImfsFetcher>(
+        imfs: &mut Imfs<F>,
+        entry: &ImfsEntry,
+    ) -> SnapshotInstanceResult<'static>;
+
+    fn from_instance(
+        tree: &RbxTree,
+        id: RbxId,
+    ) -> SnapshotFileResult;
+
+    fn change_affects_paths(
+        path: &Path
+    ) -> Vec<PathBuf> {
+        vec![path.to_path_buf()]
+    }
+}