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198 lines
5.0 KiB
198 lines
5.0 KiB
package state
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import (
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acm "github.com/tendermint/tendermint/account"
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. "github.com/tendermint/tendermint/common"
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ptypes "github.com/tendermint/tendermint/permission/types" // for GlobalPermissionAddress ...
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"github.com/tendermint/tendermint/types"
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"github.com/tendermint/tendermint/vm"
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)
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type TxCache struct {
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backend *BlockCache
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accounts map[Word256]vmAccountInfo
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storages map[Tuple256]Word256
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}
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func NewTxCache(backend *BlockCache) *TxCache {
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return &TxCache{
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backend: backend,
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accounts: make(map[Word256]vmAccountInfo),
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storages: make(map[Tuple256]Word256),
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}
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}
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//-------------------------------------
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// TxCache.account
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func (cache *TxCache) GetAccount(addr Word256) *vm.Account {
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acc, removed := cache.accounts[addr].unpack()
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if removed {
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return nil
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} else if acc == nil {
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acc2 := cache.backend.GetAccount(addr.Postfix(20))
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if acc2 != nil {
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return toVMAccount(acc2)
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}
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}
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return acc
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}
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func (cache *TxCache) UpdateAccount(acc *vm.Account) {
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addr := acc.Address
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_, removed := cache.accounts[addr].unpack()
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if removed {
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PanicSanity("UpdateAccount on a removed account")
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}
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cache.accounts[addr] = vmAccountInfo{acc, false}
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}
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func (cache *TxCache) RemoveAccount(acc *vm.Account) {
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addr := acc.Address
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_, removed := cache.accounts[addr].unpack()
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if removed {
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PanicSanity("RemoveAccount on a removed account")
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}
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cache.accounts[addr] = vmAccountInfo{acc, true}
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}
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// Creates a 20 byte address and bumps the creator's nonce.
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func (cache *TxCache) CreateAccount(creator *vm.Account) *vm.Account {
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// Generate an address
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nonce := creator.Nonce
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creator.Nonce += 1
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addr := LeftPadWord256(NewContractAddress(creator.Address.Postfix(20), int(nonce)))
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// Create account from address.
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account, removed := cache.accounts[addr].unpack()
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if removed || account == nil {
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account = &vm.Account{
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Address: addr,
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Balance: 0,
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Code: nil,
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Nonce: 0,
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Permissions: cache.GetAccount(ptypes.GlobalPermissionsAddress256).Permissions,
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Other: vmAccountOther{
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PubKey: nil,
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StorageRoot: nil,
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},
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}
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cache.accounts[addr] = vmAccountInfo{account, false}
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return account
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} else {
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// either we've messed up nonce handling, or sha3 is broken
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PanicSanity(Fmt("Could not create account, address already exists: %X", addr))
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return nil
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}
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}
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// TxCache.account
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//-------------------------------------
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// TxCache.storage
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func (cache *TxCache) GetStorage(addr Word256, key Word256) Word256 {
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// Check cache
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value, ok := cache.storages[Tuple256{addr, key}]
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if ok {
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return value
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}
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// Load from backend
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return cache.backend.GetStorage(addr, key)
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}
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// NOTE: Set value to zero to removed from the trie.
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func (cache *TxCache) SetStorage(addr Word256, key Word256, value Word256) {
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_, removed := cache.accounts[addr].unpack()
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if removed {
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PanicSanity("SetStorage() on a removed account")
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}
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cache.storages[Tuple256{addr, key}] = value
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}
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// TxCache.storage
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//-------------------------------------
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// These updates do not have to be in deterministic order,
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// the backend is responsible for ordering updates.
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func (cache *TxCache) Sync() {
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// Remove or update storage
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for addrKey, value := range cache.storages {
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addr, key := Tuple256Split(addrKey)
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cache.backend.SetStorage(addr, key, value)
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}
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// Remove or update accounts
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for addr, accInfo := range cache.accounts {
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acc, removed := accInfo.unpack()
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if removed {
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cache.backend.RemoveAccount(addr.Postfix(20))
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} else {
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cache.backend.UpdateAccount(toStateAccount(acc))
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}
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}
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}
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//-----------------------------------------------------------------------------
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// Convenience function to return address of new contract
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func NewContractAddress(caller []byte, nonce int) []byte {
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return types.NewContractAddress(caller, nonce)
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}
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// Converts backend.Account to vm.Account struct.
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func toVMAccount(acc *acm.Account) *vm.Account {
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return &vm.Account{
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Address: LeftPadWord256(acc.Address),
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Balance: acc.Balance,
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Code: acc.Code, // This is crazy.
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Nonce: int64(acc.Sequence),
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Permissions: acc.Permissions, // Copy
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Other: vmAccountOther{
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PubKey: acc.PubKey,
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StorageRoot: acc.StorageRoot,
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},
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}
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}
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// Converts vm.Account to backend.Account struct.
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func toStateAccount(acc *vm.Account) *acm.Account {
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var pubKey acm.PubKey
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var storageRoot []byte
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if acc.Other != nil {
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pubKey, storageRoot = acc.Other.(vmAccountOther).unpack()
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}
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return &acm.Account{
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Address: acc.Address.Postfix(20),
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PubKey: pubKey,
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Balance: acc.Balance,
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Code: acc.Code,
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Sequence: int(acc.Nonce),
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StorageRoot: storageRoot,
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Permissions: acc.Permissions, // Copy
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}
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}
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// Everything in acmAccount that doesn't belong in
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// exported vmAccount fields.
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type vmAccountOther struct {
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PubKey acm.PubKey
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StorageRoot []byte
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}
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func (accOther vmAccountOther) unpack() (acm.PubKey, []byte) {
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return accOther.PubKey, accOther.StorageRoot
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}
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type vmAccountInfo struct {
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account *vm.Account
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removed bool
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}
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func (accInfo vmAccountInfo) unpack() (*vm.Account, bool) {
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return accInfo.account, accInfo.removed
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}
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