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Merge pull request #7 from trinhdn2/refactor/state-account
Move statedb.Account struct to types.StateAccount
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package types | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "math/big" | ||
|
|
||
| "github.com/tomochain/tomochain/common" | ||
| "github.com/tomochain/tomochain/rlp" | ||
| ) | ||
|
|
||
| // StateAccount is the Ethereum consensus representation of accounts. | ||
| // These objects are stored in the main account trie. | ||
| type StateAccount struct { | ||
| Nonce uint64 | ||
| Balance *big.Int | ||
| Root common.Hash // merkle root of the storage trie | ||
| CodeHash []byte | ||
| } | ||
|
|
||
| // NewEmptyStateAccount constructs an empty state account. | ||
| func NewEmptyStateAccount() *StateAccount { | ||
| return &StateAccount{ | ||
| Balance: new(big.Int), | ||
| Root: EmptyRootHash, | ||
| CodeHash: EmptyCodeHash.Bytes(), | ||
| } | ||
| } | ||
|
|
||
| // Copy returns a deep-copied state account object. | ||
| func (acct *StateAccount) Copy() *StateAccount { | ||
| var balance *big.Int | ||
| if acct.Balance != nil { | ||
| balance = new(big.Int).Set(acct.Balance) | ||
| } | ||
| return &StateAccount{ | ||
| Nonce: acct.Nonce, | ||
| Balance: balance, | ||
| Root: acct.Root, | ||
| CodeHash: common.CopyBytes(acct.CodeHash), | ||
| } | ||
| } | ||
|
|
||
| // SlimAccount is a modified version of an Account, where the root is replaced | ||
| // with a byte slice. This format can be used to represent full-consensus format | ||
| // or slim format which replaces the empty root and code hash as nil byte slice. | ||
| type SlimAccount struct { | ||
| Nonce uint64 | ||
| Balance *big.Int | ||
| Root []byte // Nil if root equals to types.EmptyRootHash | ||
| CodeHash []byte // Nil if hash equals to types.EmptyCodeHash | ||
| } | ||
|
|
||
| // SlimAccountRLP encodes the state account in 'slim RLP' format. | ||
| func SlimAccountRLP(account StateAccount) []byte { | ||
| slim := SlimAccount{ | ||
| Nonce: account.Nonce, | ||
| Balance: account.Balance, | ||
| } | ||
| if account.Root != EmptyRootHash { | ||
| slim.Root = account.Root[:] | ||
| } | ||
| if !bytes.Equal(account.CodeHash, EmptyCodeHash[:]) { | ||
| slim.CodeHash = account.CodeHash | ||
| } | ||
| data, err := rlp.EncodeToBytes(slim) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return data | ||
| } | ||
|
|
||
| // FullAccount decodes the data on the 'slim RLP' format and return | ||
| // the consensus format account. | ||
| func FullAccount(data []byte) (*StateAccount, error) { | ||
| var slim SlimAccount | ||
| if err := rlp.DecodeBytes(data, &slim); err != nil { | ||
| return nil, err | ||
| } | ||
| var account StateAccount | ||
| account.Nonce, account.Balance = slim.Nonce, slim.Balance | ||
|
|
||
| // Interpret the storage root and code hash in slim format. | ||
| if len(slim.Root) == 0 { | ||
| account.Root = EmptyRootHash | ||
| } else { | ||
| account.Root = common.BytesToHash(slim.Root) | ||
| } | ||
| if len(slim.CodeHash) == 0 { | ||
| account.CodeHash = EmptyCodeHash[:] | ||
| } else { | ||
| account.CodeHash = slim.CodeHash | ||
| } | ||
| return &account, nil | ||
| } | ||
|
|
||
| // FullAccountRLP converts data on the 'slim RLP' format into the full RLP-format. | ||
| func FullAccountRLP(data []byte) ([]byte, error) { | ||
| account, err := FullAccount(data) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return rlp.EncodeToBytes(account) | ||
| } |
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