refactor(tvix/store/directorysvc): move from Vec<u8> to B3Digest r/6177

This introduces a new struct, B3Digest, which internally holds a
Vec<u8>, but only allows construction with 32 bytes.

It also implements display, which will print the base64 representation.
This should reduce some boilerplate when parsing Vec<u8>.

Change-Id: Ia91aa40cb691916773abc8f93e6ed79a5fd34863
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8592
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

1 files changed, 7 insertions, 3 deletions

diff --git a/tvix/store/src/proto/tests/directory.rs b/tvix/store/src/proto/tests/directory.rs
index 03572629e606..8d6ca7241d7a 100644
--- a/tvix/store/src/proto/tests/directory.rs
+++ b/tvix/store/src/proto/tests/directory.rs
@@ -1,4 +1,7 @@
-use crate::proto::{Directory, DirectoryNode, FileNode, SymlinkNode, ValidateDirectoryError};
+use crate::{
+    proto::{Directory, DirectoryNode, FileNode, SymlinkNode, ValidateDirectoryError},
+    B3Digest,
+};
 use lazy_static::lazy_static;
 
 lazy_static! {
@@ -66,11 +69,12 @@ fn digest() {
 
     assert_eq!(
         d.digest(),
-        [
+        B3Digest::from_vec(vec![
             0xaf, 0x13, 0x49, 0xb9, 0xf5, 0xf9, 0xa1, 0xa6, 0xa0, 0x40, 0x4d, 0xea, 0x36, 0xdc,
             0xc9, 0x49, 0x9b, 0xcb, 0x25, 0xc9, 0xad, 0xc1, 0x12, 0xb7, 0xcc, 0x9a, 0x93, 0xca,
             0xe4, 0x1f, 0x32, 0x62
-        ]
+        ])
+        .unwrap()
     )
 }