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core/state: add code to state reader #30808

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core/state: add code to state reader #30808

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2 changes: 1 addition & 1 deletion core/state/database.go
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Original file line number Diff line number Diff line change
Expand Up @@ -193,7 +193,7 @@ func (db *CachingDB) Reader(stateRoot common.Hash) (Reader, error) {
}
// Set up the trie reader, which is expected to always be available
// as the gatekeeper unless the state is corrupted.
tr, err := newTrieReader(stateRoot, db.triedb, db.pointCache)
tr, err := newTrieReader(stateRoot, db.triedb, db, db.pointCache)
if err != nil {
return nil, err
}
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85 changes: 72 additions & 13 deletions core/state/reader.go
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,19 @@ type Reader interface {
// - The returned storage slot is safe to modify after the call
Storage(addr common.Address, slot common.Hash) (common.Hash, error)

// ContractCode returns the code associated with a particular account.
//
// - Returns an empty code if it does not exist
// - It can return an error to indicate code doesn't exist
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This breaks consistency to the rest of the interface. I have done this to avoid any semantics change in this PR.

I am a bit puzzled why the statedb is recording "not found" errors for code but not for storage or account.

// - The returned code is safe to modify after the call
ContractCode(addr common.Address, codeHash common.Hash) ([]byte, error)

// ContractCodeSize returns the size of the code associated with a particular account.
//
// - Returns 0 if the code does not exist
// - It can return an error to indicate code doesn't exist
ContractCodeSize(addr common.Address, codeHash common.Hash) (int, error)

// Copy returns a deep-copied state reader.
Copy() Reader
}
Expand Down Expand Up @@ -123,6 +136,16 @@ func (r *stateReader) Storage(addr common.Address, key common.Hash) (common.Hash
return value, nil
}

// ContractCode implements Reader, retrieving the code associated with a particular account.
func (r *stateReader) ContractCode(addr common.Address, codeHash common.Hash) ([]byte, error) {
return nil, nil
}

// ContractCodeSize implements Reader, returning the size of the code associated with a particular account.
func (r *stateReader) ContractCodeSize(addr common.Address, codeHash common.Hash) (int, error) {
return 0, nil
}

// Copy implements Reader, returning a deep-copied snap reader.
func (r *stateReader) Copy() Reader {
return &stateReader{
Expand All @@ -134,17 +157,18 @@ func (r *stateReader) Copy() Reader {
// trieReader implements the Reader interface, providing functions to access
// state from the referenced trie.
type trieReader struct {
root common.Hash // State root which uniquely represent a state
db *triedb.Database // Database for loading trie
buff crypto.KeccakState // Buffer for keccak256 hashing
mainTrie Trie // Main trie, resolved in constructor
subRoots map[common.Address]common.Hash // Set of storage roots, cached when the account is resolved
subTries map[common.Address]Trie // Group of storage tries, cached when it's resolved
root common.Hash // State root which uniquely represent a state
db *triedb.Database // Database for loading trie
contractDB Database // Database for loading code
buff crypto.KeccakState // Buffer for keccak256 hashing
mainTrie Trie // Main trie, resolved in constructor
subRoots map[common.Address]common.Hash // Set of storage roots, cached when the account is resolved
subTries map[common.Address]Trie // Group of storage tries, cached when it's resolved
}

// trieReader constructs a trie reader of the specific state. An error will be
// returned if the associated trie specified by root is not existent.
func newTrieReader(root common.Hash, db *triedb.Database, cache *utils.PointCache) (*trieReader, error) {
func newTrieReader(root common.Hash, db *triedb.Database, contractDB Database, cache *utils.PointCache) (*trieReader, error) {
var (
tr Trie
err error
Expand All @@ -158,12 +182,13 @@ func newTrieReader(root common.Hash, db *triedb.Database, cache *utils.PointCach
return nil, err
}
return &trieReader{
root: root,
db: db,
buff: crypto.NewKeccakState(),
mainTrie: tr,
subRoots: make(map[common.Address]common.Hash),
subTries: make(map[common.Address]Trie),
root: root,
db: db,
contractDB: contractDB,
buff: crypto.NewKeccakState(),
mainTrie: tr,
subRoots: make(map[common.Address]common.Hash),
subTries: make(map[common.Address]Trie),
}, nil
}

Expand Down Expand Up @@ -227,6 +252,16 @@ func (r *trieReader) Storage(addr common.Address, key common.Hash) (common.Hash,
return value, nil
}

// ContractCode implements Reader, retrieving the code associated with a particular account.
func (r *trieReader) ContractCode(addr common.Address, codeHash common.Hash) ([]byte, error) {
return r.contractDB.ContractCode(addr, codeHash)
}

// ContractCodeSize implements Reader, returning the size of the code associated with a particular account.
func (r *trieReader) ContractCodeSize(addr common.Address, codeHash common.Hash) (int, error) {
return r.contractDB.ContractCodeSize(addr, codeHash)
}

// Copy implements Reader, returning a deep-copied trie reader.
func (r *trieReader) Copy() Reader {
tries := make(map[common.Address]Trie)
Expand Down Expand Up @@ -298,6 +333,30 @@ func (r *multiReader) Storage(addr common.Address, slot common.Hash) (common.Has
return common.Hash{}, errors.Join(errs...)
}

// ContractCode implements Reader, retrieving the code associated with a particular account.
func (r *multiReader) ContractCode(addr common.Address, codeHash common.Hash) ([]byte, error) {
var errs []error
for _, reader := range r.readers {
code, err := reader.ContractCode(addr, codeHash)
if err == nil {
return code, nil
}
}
return nil, errors.Join(errs...)
}

// ContractCodeSize implements Reader, returning the size of the code associated with a particular account.
func (r *multiReader) ContractCodeSize(addr common.Address, codeHash common.Hash) (int, error) {
var errs []error
for _, reader := range r.readers {
size, err := reader.ContractCodeSize(addr, codeHash)
if err == nil {
return size, nil
}
}
return 0, errors.Join(errs...)
}

// Copy implementing Reader interface, returning a deep-copied state reader.
func (r *multiReader) Copy() Reader {
var readers []Reader
Expand Down
4 changes: 2 additions & 2 deletions core/state/state_object.go
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Original file line number Diff line number Diff line change
Expand Up @@ -510,7 +510,7 @@ func (s *stateObject) Code() []byte {
if bytes.Equal(s.CodeHash(), types.EmptyCodeHash.Bytes()) {
return nil
}
code, err := s.db.db.ContractCode(s.address, common.BytesToHash(s.CodeHash()))
code, err := s.db.reader.ContractCode(s.address, common.BytesToHash(s.CodeHash()))
if err != nil {
s.db.setError(fmt.Errorf("can't load code hash %x: %v", s.CodeHash(), err))
}
Expand All @@ -528,7 +528,7 @@ func (s *stateObject) CodeSize() int {
if bytes.Equal(s.CodeHash(), types.EmptyCodeHash.Bytes()) {
return 0
}
size, err := s.db.db.ContractCodeSize(s.address, common.BytesToHash(s.CodeHash()))
size, err := s.db.reader.ContractCodeSize(s.address, common.BytesToHash(s.CodeHash()))
if err != nil {
s.db.setError(fmt.Errorf("can't load code size %x: %v", s.CodeHash(), err))
}
Expand Down
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