relax the restriction of delete latest version

Closes: #482 Update nodedb.go changelog
cosmos · Mar 11, 2022 · de3e0a4 · de3e0a4
1 parent ccfb418
commit de3e0a4
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Improvements
+
+- [#483](https://github.com/cosmos/iavl/pull/483) Allow delete latest version.
+
 ## 0.18.0 (March 10, 2022)
 
 ### Breaking Changes

diff --git a/mutable_tree.go b/mutable_tree.go
@@ -566,13 +566,10 @@ func (tree *MutableTree) deleteVersion(version int64) error {
 	if version <= 0 {
 		return errors.New("version must be greater than 0")
 	}
-	if version == tree.version {
-		return errors.Errorf("cannot delete latest saved version (%d)", version)
-	}
 	if !tree.VersionExists(version) {
 		return errors.Wrap(ErrVersionDoesNotExist, "")
 	}
-	if err := tree.ndb.DeleteVersion(version, true); err != nil {
+	if err := tree.ndb.DeleteVersion(version, false); err != nil {
 		return err
 	}
 

diff --git a/nodedb.go b/nodedb.go
@@ -281,8 +281,8 @@ func (ndb *nodeDB) DeleteVersionsRange(fromVersion, toVersion int64) error {
 	defer ndb.mtx.Unlock()
 
 	latest := ndb.getLatestVersion()
-	if latest < toVersion {
-		return errors.Errorf("cannot delete latest saved version (%d)", latest)
+	if latest+1 < toVersion {
+		return errors.Errorf("cannot delete future versions [%d..%d)", latest+1, toVersion)
 	}
 
 	predecessor := ndb.getPreviousVersion(fromVersion)