fix: add an empty freeze db

cmd/geth/dbcmd.go

@@ -508,7 +508,7 @@ func ancientInspect(ctx *cli.Context) error {
 	stack, _ := makeConfigNode(ctx)
 	defer stack.Close()
 
-	db := utils.MakeChainDatabase(ctx, stack, true, true)
+	db := utils.MakeChainDatabase(ctx, stack, true, false)
 	defer db.Close()
 	return rawdb.AncientInspect(db)
 }

core/rawdb/database.go

@@ -61,7 +61,7 @@ func (frdb *freezerdb) BlockStoreReader() ethdb.Reader {
 }
 
 func (frdb *freezerdb) BlockStoreWriter() ethdb.Writer {
-	//TODO implement me
+	// TODO implement me
 	panic("implement me")
 }
 
@@ -318,6 +318,137 @@ func NewDatabase(db ethdb.KeyValueStore) ethdb.Database {
 	return &nofreezedb{KeyValueStore: db}
 }
 
+type emptyfreezedb struct {
+	ethdb.KeyValueStore
+}
+
+// HasAncient returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) HasAncient(kind string, number uint64) (bool, error) {
+	return false, nil
+}
+
+// Ancient returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) Ancient(kind string, number uint64) ([]byte, error) {
+	return nil, nil
+}
+
+// AncientRange returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) AncientRange(kind string, start, max, maxByteSize uint64) ([][]byte, error) {
+	return nil, nil
+}
+
+// Ancients returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) Ancients() (uint64, error) {
+	return 0, nil
+}
+
+// Ancients returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) ItemAmountInAncient() (uint64, error) {
+	return 0, nil
+}
+
+// Tail returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) Tail() (uint64, error) {
+	return 0, nil
+}
+
+// AncientSize returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) AncientSize(kind string) (uint64, error) {
+	return 0, nil
+}
+
+// ModifyAncients returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) ModifyAncients(func(ethdb.AncientWriteOp) error) (int64, error) {
+	return 0, nil
+}
+
+// TruncateHead returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) TruncateHead(items uint64) (uint64, error) {
+	return 0, nil
+}
+
+// TruncateTail returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) TruncateTail(items uint64) (uint64, error) {
+	return 0, nil
+}
+
+// TruncateTableTail returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) TruncateTableTail(kind string, tail uint64) (uint64, error) {
+	return 0, nil
+}
+
+// ResetTable returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) ResetTable(kind string, startAt uint64, onlyEmpty bool) error {
+	return nil
+}
+
+// Sync returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) Sync() error {
+	return nil
+}
+
+func (db *emptyfreezedb) DiffStore() ethdb.KeyValueStore {
+	return db
+}
+
+func (db *emptyfreezedb) SetDiffStore(diff ethdb.KeyValueStore) {
+}
+
+func (db *emptyfreezedb) StateStore() ethdb.Database {
+	return db
+}
+
+func (db *emptyfreezedb) SetStateStore(state ethdb.Database) {
+}
+
+func (db *emptyfreezedb) StateStoreReader() ethdb.Reader {
+	return db
+}
+
+func (db *emptyfreezedb) BlockStore() ethdb.Database {
+	return db
+}
+
+func (db *emptyfreezedb) SetBlockStore(block ethdb.Database) {
+}
+
+func (db *emptyfreezedb) BlockStoreReader() ethdb.Reader {
+	return db
+}
+
+func (db *emptyfreezedb) BlockStoreWriter() ethdb.Writer {
+	return db
+}
+
+func (db *emptyfreezedb) ReadAncients(fn func(reader ethdb.AncientReaderOp) error) (err error) {
+	return nil
+}
+
+func (db *emptyfreezedb) AncientOffSet() uint64 {
+	return 0
+}
+
+// MigrateTable returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) MigrateTable(kind string, convert convertLegacyFn) error {
+	return nil
+}
+
+// AncientDatadir returns nil for pruned db that we don't have a backing chain freezer.
+func (db *emptyfreezedb) AncientDatadir() (string, error) {
+	return "", nil
+}
+
+func (db *emptyfreezedb) SetupFreezerEnv(env *ethdb.FreezerEnv) error {
+	return nil
+}
+
+// NewEmptyFreezeDB is used for CLI such as `geth db inspect` in pruned db that we don't
+// have a backing chain freezer.
+// WARNING: it must be only used in the above case.
+func NewEmptyFreezeDB(db ethdb.KeyValueStore) ethdb.Database {
+	return &emptyfreezedb{KeyValueStore: db}
+}
+
 // NewFreezerDb only create a freezer without statedb.
 func NewFreezerDb(db ethdb.KeyValueStore, frz, namespace string, readonly bool, newOffSet uint64) (*Freezer, error) {
 	// Create the idle freezer instance, this operation should be atomic to avoid mismatch between offset and acientDB.
@@ -367,6 +498,12 @@ func NewDatabaseWithFreezer(db ethdb.KeyValueStore, ancient string, namespace st
 		offset = ReadOffSetOfCurrentAncientFreezer(db)
 	}
 
+	// This case is used for someone who wants to execute geth db inspect CLI in a pruned db
+	if !disableFreeze && readonly && ReadAncientType(db) == PruneFreezerType {
+		log.Warn("Disk db is pruned, return an empty freezer db which is used for CLI")
+		return NewEmptyFreezeDB(db), nil
+	}
+
 	if pruneAncientData && !disableFreeze && !readonly {
 		frdb, err := newPrunedFreezer(resolveChainFreezerDir(ancient), db, offset)
 		if err != nil {
@@ -619,7 +756,7 @@ func Open(o OpenOptions) (ethdb.Database, error) {
 	}
 	if ReadAncientType(kvdb) == PruneFreezerType {
 		if !o.PruneAncientData {
-			log.Warn("Disk db is pruned")
+			log.Warn("NOTICE: You're opening a disk db is pruned!")
 		}
 	}
 	if len(o.AncientsDirectory) == 0 {