feat(core/coretesting): make memDB satisfy db.Db interface

core/testing/memdb.go

@@ -291,12 +291,20 @@ func (bt *MemDB) Set(key, value []byte) error {
 	return bt.kv.Set(key, value)
 }
 
+func (bt *MemDB) SetSync(key, value []byte) error {
+	return bt.Set(key, value)
+}
+
 func (bt *MemDB) Delete(key []byte) error {
 	bt.mtx.Lock()
 	defer bt.mtx.Unlock()
 	return bt.kv.Delete(key)
 }
 
+func (bt *MemDB) DeleteSync(key []byte) error {
+	return bt.Delete(key)
+}
+
 func (bt *MemDB) Iterator(start, end []byte) (store.Iterator, error) {
 	return bt.kv.Iterator(start, end)
 }
@@ -305,6 +313,27 @@ func (bt *MemDB) ReverseIterator(start, end []byte) (store.Iterator, error) {
 	return bt.kv.ReverseIterator(start, end)
 }
 
+func (db *MemDB) Print() error {
+	db.mtx.RLock()
+	defer db.mtx.RUnlock()
+
+	db.kv.tree.Ascend(item{}, func(i item) bool {
+		fmt.Printf("[%X]:\t[%X]\n", i.key, i.value)
+		return true
+	})
+	return nil
+}
+
+func (db *MemDB) Stats() map[string]string {
+	db.mtx.RLock()
+	defer db.mtx.RUnlock()
+
+	stats := make(map[string]string)
+	stats["database.type"] = "memDB"
+	stats["database.size"] = fmt.Sprintf("%d", db.kv.tree.Len())
+	return stats
+}
+
 // Close closes the MemDB, releasing any resources held.
 func (db *MemDB) Close() error {
 	return nil

tests/go.mod

@@ -50,6 +50,7 @@ require (
 	cosmossdk.io/x/slashing v0.0.0-00010101000000-000000000000
 	cosmossdk.io/x/staking v0.0.0-20240226161501-23359a0b6d91
 	github.com/cometbft/cometbft/api v1.0.0-rc.1
+	github.com/cosmos/cosmos-db v1.0.3-0.20240911104526-ddc3f09bfc22
 	github.com/google/go-cmp v0.6.0
 	github.com/google/gofuzz v1.2.0
 	github.com/jhump/protoreflect v1.17.0
@@ -103,7 +104,6 @@ require (
 	github.com/cockroachdb/tokenbucket v0.0.0-20230807174530-cc333fc44b06 // indirect
 	github.com/cometbft/cometbft-db v0.15.0 // indirect
 	github.com/cosmos/btcutil v1.0.5 // indirect
-	github.com/cosmos/cosmos-db v1.0.3-0.20240911104526-ddc3f09bfc22 // indirect
 	github.com/cosmos/crypto v0.1.2 // indirect
 	github.com/cosmos/go-bip39 v1.0.0 // indirect
 	github.com/cosmos/gogogateway v1.2.0 // indirect

tests/integration/type_check.go

@@ -0,0 +1,14 @@
+package integration
+
+import (
+	coretesting "cosmossdk.io/core/testing"
+
+	db "github.com/cosmos/cosmos-db"
+)
+
+// This file contains a list of type checks that are used to ensure that implementations
+// matches the interface. We do not do those type checks directly in the components to
+// avoid to bring in more dependencies than needed.
+var (
+	_ db.DB = (*coretesting.MemDB)(nil)
+)