Write format version in commit

turbofish-org · Nov 14, 2024 · 16de2df · 16de2df
1 parent b92b97a
commit 16de2df
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/src/merk/mod.rs b/src/merk/mod.rs
@@ -17,9 +17,12 @@ use crate::tree::{Batch, Commit, Fetch, GetResult, Hash, Op, RefWalker, Tree, Wa
 pub use self::snapshot::Snapshot;
 
 const ROOT_KEY_KEY: &[u8] = b"root";
+const FORMAT_VERSION_KEY: &[u8] = b"format";
 const AUX_CF_NAME: &str = "aux";
 const INTERNAL_CF_NAME: &str = "internal";
 
+const FORMAT_VERSION: u64 = 1;
+
 fn column_families() -> Vec<ColumnFamilyDescriptor> {
     vec![
         // TODO: clone opts or take args
@@ -391,6 +394,14 @@ impl Merk {
             };
         }
 
+        // update format version
+        // TODO: shouldn't need a write per commit
+        batch.put_cf(
+            internal_cf,
+            FORMAT_VERSION_KEY,
+            &FORMAT_VERSION.to_be_bytes(),
+        );
+
         // write to db
         self.write(batch)?;