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Merge pull request #2019 from zsfelfoldi/light-state 

Light state
This commit is contained in:
Jeffrey Wilcke 2015-12-18 12:40:01 +01:00
parent 2baf1de00d ef422ee1e1
commit fd69d2b7a8
10 changed files with 1091 additions and 15 deletions
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98
light/odr.go Normal file
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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package light implements on-demand retrieval capable state and chain objects
// for the Ethereum Light Client.
package light
import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/rlp"
"golang.org/x/net/context"
)
// OdrBackend is an interface to a backend service that handles odr retrievals
type OdrBackend interface {
Database() ethdb.Database
Retrieve(ctx context.Context, req OdrRequest) error
}
// OdrRequest is an interface for retrieval requests
type OdrRequest interface {
StoreResult(db ethdb.Database)
}
// TrieRequest is the ODR request type for state/storage trie entries
type TrieRequest struct {
OdrRequest
root common.Hash
key []byte
proof []rlp.RawValue
}
// StoreResult stores the retrieved data in local database
func (req *TrieRequest) StoreResult(db ethdb.Database) {
storeProof(db, req.proof)
}
// storeProof stores the new trie nodes obtained from a merkle proof in the database
func storeProof(db ethdb.Database, proof []rlp.RawValue) {
for _, buf := range proof {
hash := crypto.Sha3(buf)
val, _ := db.Get(hash)
if val == nil {
db.Put(hash, buf)
}
}
}
// NodeDataRequest is the ODR request type for node data (used for retrieving contract code)
type NodeDataRequest struct {
OdrRequest
hash common.Hash
data []byte
}
// GetData returns the retrieved node data after a successful request
func (req *NodeDataRequest) GetData() []byte {
return req.data
}
// StoreResult stores the retrieved data in local database
func (req *NodeDataRequest) StoreResult(db ethdb.Database) {
db.Put(req.hash[:], req.GetData())
}
var sha3_nil = crypto.Sha3Hash(nil)
// retrieveNodeData tries to retrieve node data with the given hash from the network
func retrieveNodeData(ctx context.Context, odr OdrBackend, hash common.Hash) ([]byte, error) {
if hash == sha3_nil {
return nil, nil
}
res, _ := odr.Database().Get(hash[:])
if res != nil {
return res, nil
}
r := &NodeDataRequest{hash: hash}
if err := odr.Retrieve(ctx, r); err != nil {
return nil, err
} else {
return r.GetData(), nil
}
}

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light/state.go Normal file
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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package light
import (
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"golang.org/x/net/context"
)
// StartingNonce determines the default nonce when new accounts are being created.
var StartingNonce uint64
// LightState is a memory representation of a state.
// This version is ODR capable, caching only the already accessed part of the
// state, retrieving unknown parts on-demand from the ODR backend. Changes are
// never stored in the local database, only in the memory objects.
type LightState struct {
odr OdrBackend
trie *LightTrie
stateObjects map[string]*StateObject
}
// NewLightState creates a new LightState with the specified root.
// Note that the creation of a light state is always successful, even if the
// root is non-existent. In that case, ODR retrieval will always be unsuccessful
// and every operation will return with an error or wait for the context to be
// cancelled.
func NewLightState(root common.Hash, odr OdrBackend) *LightState {
tr := NewLightTrie(root, odr, true)
return &LightState{
odr: odr,
trie: tr,
stateObjects: make(map[string]*StateObject),
}
}
// HasAccount returns true if an account exists at the given address
func (self *LightState) HasAccount(ctx context.Context, addr common.Address) (bool, error) {
so, err := self.GetStateObject(ctx, addr)
return so != nil, err
}
// GetBalance retrieves the balance from the given address or 0 if the account does
// not exist
func (self *LightState) GetBalance(ctx context.Context, addr common.Address) (*big.Int, error) {
stateObject, err := self.GetStateObject(ctx, addr)
if err != nil {
return common.Big0, err
}
if stateObject != nil {
return stateObject.balance, nil
}
return common.Big0, nil
}
// GetNonce returns the nonce at the given address or 0 if the account does
// not exist
func (self *LightState) GetNonce(ctx context.Context, addr common.Address) (uint64, error) {
stateObject, err := self.GetStateObject(ctx, addr)
if err != nil {
return 0, err
}
if stateObject != nil {
return stateObject.nonce, nil
}
return 0, nil
}
// GetCode returns the contract code at the given address or nil if the account
// does not exist
func (self *LightState) GetCode(ctx context.Context, addr common.Address) ([]byte, error) {
stateObject, err := self.GetStateObject(ctx, addr)
if err != nil {
return nil, err
}
if stateObject != nil {
return stateObject.code, nil
}
return nil, nil
}
// GetState returns the contract storage value at storage address b from the
// contract address a or common.Hash{} if the account does not exist
func (self *LightState) GetState(ctx context.Context, a common.Address, b common.Hash) (common.Hash, error) {
stateObject, err := self.GetStateObject(ctx, a)
if err == nil && stateObject != nil {
return stateObject.GetState(ctx, b)
}
return common.Hash{}, err
}
// IsDeleted returns true if the given account has been marked for deletion
// or false if the account does not exist
func (self *LightState) IsDeleted(ctx context.Context, addr common.Address) (bool, error) {
stateObject, err := self.GetStateObject(ctx, addr)
if err == nil && stateObject != nil {
return stateObject.remove, nil
}
return false, err
}
/*
* SETTERS
*/
// AddBalance adds the given amount to the balance of the specified account
func (self *LightState) AddBalance(ctx context.Context, addr common.Address, amount *big.Int) error {
stateObject, err := self.GetOrNewStateObject(ctx, addr)
if err == nil && stateObject != nil {
stateObject.AddBalance(amount)
}
return err
}
// SetNonce sets the nonce of the specified account
func (self *LightState) SetNonce(ctx context.Context, addr common.Address, nonce uint64) error {
stateObject, err := self.GetOrNewStateObject(ctx, addr)
if err == nil && stateObject != nil {
stateObject.SetNonce(nonce)
}
return err
}
// SetCode sets the contract code at the specified account
func (self *LightState) SetCode(ctx context.Context, addr common.Address, code []byte) error {
stateObject, err := self.GetOrNewStateObject(ctx, addr)
if err == nil && stateObject != nil {
stateObject.SetCode(code)
}
return err
}
// SetState sets the storage value at storage address key of the account addr
func (self *LightState) SetState(ctx context.Context, addr common.Address, key common.Hash, value common.Hash) error {
stateObject, err := self.GetOrNewStateObject(ctx, addr)
if err == nil && stateObject != nil {
stateObject.SetState(key, value)
}
return err
}
// Delete marks an account to be removed and clears its balance
func (self *LightState) Delete(ctx context.Context, addr common.Address) (bool, error) {
stateObject, err := self.GetOrNewStateObject(ctx, addr)
if err == nil && stateObject != nil {
stateObject.MarkForDeletion()
stateObject.balance = new(big.Int)
return true, nil
}
return false, err
}
//
// Get, set, new state object methods
//
// GetStateObject returns the state object of the given account or nil if the
// account does not exist
func (self *LightState) GetStateObject(ctx context.Context, addr common.Address) (stateObject *StateObject, err error) {
stateObject = self.stateObjects[addr.Str()]
if stateObject != nil {
if stateObject.deleted {
stateObject = nil
}
return stateObject, nil
}
data, err := self.trie.Get(ctx, addr[:])
if err != nil {
return nil, err
}
if len(data) == 0 {
return nil, nil
}
stateObject, err = DecodeObject(ctx, addr, self.odr, []byte(data))
if err != nil {
return nil, err
}
self.SetStateObject(stateObject)
return stateObject, nil
}
// SetStateObject sets the state object of the given account
func (self *LightState) SetStateObject(object *StateObject) {
self.stateObjects[object.Address().Str()] = object
}
// GetOrNewStateObject returns the state object of the given account or creates a
// new one if the account does not exist
func (self *LightState) GetOrNewStateObject(ctx context.Context, addr common.Address) (*StateObject, error) {
stateObject, err := self.GetStateObject(ctx, addr)
if err == nil && (stateObject == nil || stateObject.deleted) {
stateObject, err = self.CreateStateObject(ctx, addr)
}
return stateObject, err
}
// newStateObject creates a state object whether it exists in the state or not
func (self *LightState) newStateObject(addr common.Address) *StateObject {
if glog.V(logger.Core) {
glog.Infof("(+) %x\n", addr)
}
stateObject := NewStateObject(addr, self.odr)
stateObject.SetNonce(StartingNonce)
self.stateObjects[addr.Str()] = stateObject
return stateObject
}
// CreateStateObject creates creates a new state object and takes ownership.
// This is different from "NewStateObject"
func (self *LightState) CreateStateObject(ctx context.Context, addr common.Address) (*StateObject, error) {
// Get previous (if any)
so, err := self.GetStateObject(ctx, addr)
if err != nil {
return nil, err
}
// Create a new one
newSo := self.newStateObject(addr)
// If it existed set the balance to the new account
if so != nil {
newSo.balance = so.balance
}
return newSo, nil
}
//
// Setting, copying of the state methods
//
// Copy creates a copy of the state
func (self *LightState) Copy() *LightState {
// ignore error - we assume state-to-be-copied always exists
state := NewLightState(common.Hash{}, self.odr)
state.trie = self.trie
for k, stateObject := range self.stateObjects {
state.stateObjects[k] = stateObject.Copy()
}
return state
}
// Set copies the contents of the given state onto this state, overwriting
// its contents
func (self *LightState) Set(state *LightState) {
self.trie = state.trie
self.stateObjects = state.stateObjects
}

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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package light
import (
"bytes"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/rlp"
"golang.org/x/net/context"
)
var emptyCodeHash = crypto.Sha3(nil)
// Code represents a contract code in binary form
type Code []byte
// String returns a string representation of the code
func (self Code) String() string {
return string(self) //strings.Join(Disassemble(self), " ")
}
// Storage is a memory map cache of a contract storage
type Storage map[string]common.Hash
// String returns a string representation of the storage cache
func (self Storage) String() (str string) {
for key, value := range self {
str += fmt.Sprintf("%X : %X\n", key, value)
}
return
}
// Copy copies the contents of a storage cache
func (self Storage) Copy() Storage {
cpy := make(Storage)
for key, value := range self {
cpy[key] = value
}
return cpy
}
// StateObject is a memory representation of an account or contract and its storage.
// This version is ODR capable, caching only the already accessed part of the
// storage, retrieving unknown parts on-demand from the ODR backend. Changes are
// never stored in the local database, only in the memory objects.
type StateObject struct {
odr OdrBackend
trie *LightTrie
// Address belonging to this account
address common.Address
// The balance of the account
balance *big.Int
// The nonce of the account
nonce uint64
// The code hash if code is present (i.e. a contract)
codeHash []byte
// The code for this account
code Code
// Temporarily initialisation code
initCode Code
// Cached storage (flushed when updated)
storage Storage
// Mark for deletion
// When an object is marked for deletion it will be delete from the trie
// during the "update" phase of the state transition
remove bool
deleted bool
dirty bool
}
// NewStateObject creates a new StateObject of the specified account address
func NewStateObject(address common.Address, odr OdrBackend) *StateObject {
object := &StateObject{
odr: odr,
address: address,
balance: new(big.Int),
dirty: true,
codeHash: emptyCodeHash,
storage: make(Storage),
}
object.trie = NewLightTrie(common.Hash{}, odr, true)
return object
}
// MarkForDeletion marks an account to be removed
func (self *StateObject) MarkForDeletion() {
self.remove = true
self.dirty = true
if glog.V(logger.Core) {
glog.Infof("%x: #%d %v X\n", self.Address(), self.nonce, self.balance)
}
}
// getAddr gets the storage value at the given address from the trie
func (c *StateObject) getAddr(ctx context.Context, addr common.Hash) (common.Hash, error) {
var ret []byte
val, err := c.trie.Get(ctx, addr[:])
if err != nil {
return common.Hash{}, err
}
rlp.DecodeBytes(val, &ret)
return common.BytesToHash(ret), nil
}
// Storage returns the storage cache object of the account
func (self *StateObject) Storage() Storage {
return self.storage
}
// GetState returns the storage value at the given address from either the cache
// or the trie
func (self *StateObject) GetState(ctx context.Context, key common.Hash) (common.Hash, error) {
strkey := key.Str()
value, exists := self.storage[strkey]
if !exists {
var err error
value, err = self.getAddr(ctx, key)
if err != nil {
return common.Hash{}, err
}
if (value != common.Hash{}) {
self.storage[strkey] = value
}
}
return value, nil
}
// SetState sets the storage value at the given address
func (self *StateObject) SetState(k, value common.Hash) {
self.storage[k.Str()] = value
self.dirty = true
}
// AddBalance adds the given amount to the account balance
func (c *StateObject) AddBalance(amount *big.Int) {
c.SetBalance(new(big.Int).Add(c.balance, amount))
if glog.V(logger.Core) {
glog.Infof("%x: #%d %v (+ %v)\n", c.Address(), c.nonce, c.balance, amount)
}
}
// SubBalance subtracts the given amount from the account balance
func (c *StateObject) SubBalance(amount *big.Int) {
c.SetBalance(new(big.Int).Sub(c.balance, amount))
if glog.V(logger.Core) {
glog.Infof("%x: #%d %v (- %v)\n", c.Address(), c.nonce, c.balance, amount)
}
}
// SetBalance sets the account balance to the given amount
func (c *StateObject) SetBalance(amount *big.Int) {
c.balance = amount
c.dirty = true
}
// Copy creates a copy of the state object
func (self *StateObject) Copy() *StateObject {
stateObject := NewStateObject(self.Address(), self.odr)
stateObject.balance.Set(self.balance)
stateObject.codeHash = common.CopyBytes(self.codeHash)
stateObject.nonce = self.nonce
stateObject.trie = self.trie
stateObject.code = common.CopyBytes(self.code)
stateObject.initCode = common.CopyBytes(self.initCode)
stateObject.storage = self.storage.Copy()
stateObject.remove = self.remove
stateObject.dirty = self.dirty
stateObject.deleted = self.deleted
return stateObject
}
//
// Attribute accessors
//
// Balance returns the account balance
func (self *StateObject) Balance() *big.Int {
return self.balance
}
// Address returns the address of the contract/account
func (c *StateObject) Address() common.Address {
return c.address
}
// Code returns the contract code
func (self *StateObject) Code() []byte {
return self.code
}
// SetCode sets the contract code
func (self *StateObject) SetCode(code []byte) {
self.code = code
self.codeHash = crypto.Sha3(code)
self.dirty = true
}
// SetNonce sets the account nonce
func (self *StateObject) SetNonce(nonce uint64) {
self.nonce = nonce
self.dirty = true
}
// Nonce returns the account nonce
func (self *StateObject) Nonce() uint64 {
return self.nonce
}
// Encoding
type extStateObject struct {
Nonce uint64
Balance *big.Int
Root common.Hash
CodeHash []byte
}
// DecodeObject decodes an RLP-encoded state object.
func DecodeObject(ctx context.Context, address common.Address, odr OdrBackend, data []byte) (*StateObject, error) {
var (
obj = &StateObject{address: address, odr: odr, storage: make(Storage)}
ext extStateObject
err error
)
if err = rlp.DecodeBytes(data, &ext); err != nil {
return nil, err
}
obj.trie = NewLightTrie(ext.Root, odr, true)
if !bytes.Equal(ext.CodeHash, emptyCodeHash) {
if obj.code, err = retrieveNodeData(ctx, obj.odr, common.BytesToHash(ext.CodeHash)); err != nil {
return nil, fmt.Errorf("can't find code for hash %x: %v", ext.CodeHash, err)
}
}
obj.nonce = ext.Nonce
obj.balance = ext.Balance
obj.codeHash = ext.CodeHash
return obj, nil
}

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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package light
import (
"bytes"
"math/big"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/trie"
"golang.org/x/net/context"
)
type testOdr struct {
OdrBackend
sdb, ldb ethdb.Database
}
func (odr *testOdr) Database() ethdb.Database {
return odr.ldb
}
func (odr *testOdr) Retrieve(ctx context.Context, req OdrRequest) error {
switch req := req.(type) {
case *TrieRequest:
t, _ := trie.New(req.root, odr.sdb)
req.proof = t.Prove(req.key)
trie.ClearGlobalCache()
case *NodeDataRequest:
req.data, _ = odr.sdb.Get(req.hash[:])
}
req.StoreResult(odr.ldb)
return nil
}
func makeTestState() (common.Hash, ethdb.Database) {
sdb, _ := ethdb.NewMemDatabase()
st, _ := state.New(common.Hash{}, sdb)
for i := byte(0); i < 100; i++ {
so := st.GetOrNewStateObject(common.Address{i})
for j := byte(0); j < 100; j++ {
val := common.Hash{i, j}
so.SetState(common.Hash{j}, val)
so.SetNonce(100)
}
so.AddBalance(big.NewInt(int64(i)))
so.SetCode([]byte{i, i, i})
so.Update()
st.UpdateStateObject(so)
}
root, _ := st.Commit()
return root, sdb
}
func TestLightStateOdr(t *testing.T) {
root, sdb := makeTestState()
ldb, _ := ethdb.NewMemDatabase()
odr := &testOdr{sdb: sdb, ldb: ldb}
ls := NewLightState(root, odr)
ctx := context.Background()
trie.ClearGlobalCache()
for i := byte(0); i < 100; i++ {
addr := common.Address{i}
err := ls.AddBalance(ctx, addr, big.NewInt(1000))
if err != nil {
t.Fatalf("Error adding balance to acc[%d]: %v", i, err)
}
err = ls.SetState(ctx, addr, common.Hash{100}, common.Hash{i, 100})
if err != nil {
t.Fatalf("Error setting storage of acc[%d]: %v", i, err)
}
}
addr := common.Address{100}
_, err := ls.CreateStateObject(ctx, addr)
if err != nil {
t.Fatalf("Error creating state object: %v", err)
}
err = ls.SetCode(ctx, addr, []byte{100, 100, 100})
if err != nil {
t.Fatalf("Error setting code: %v", err)
}
err = ls.AddBalance(ctx, addr, big.NewInt(1100))
if err != nil {
t.Fatalf("Error adding balance to acc[100]: %v", err)
}
for j := byte(0); j < 101; j++ {
err = ls.SetState(ctx, addr, common.Hash{j}, common.Hash{100, j})
if err != nil {
t.Fatalf("Error setting storage of acc[100]: %v", err)
}
}
err = ls.SetNonce(ctx, addr, 100)
if err != nil {
t.Fatalf("Error setting nonce for acc[100]: %v", err)
}
for i := byte(0); i < 101; i++ {
addr := common.Address{i}
bal, err := ls.GetBalance(ctx, addr)
if err != nil {
t.Fatalf("Error getting balance of acc[%d]: %v", i, err)
}
if bal.Int64() != int64(i)+1000 {
t.Fatalf("Incorrect balance at acc[%d]: expected %v, got %v", i, int64(i)+1000, bal.Int64())
}
nonce, err := ls.GetNonce(ctx, addr)
if err != nil {
t.Fatalf("Error getting nonce of acc[%d]: %v", i, err)
}
if nonce != 100 {
t.Fatalf("Incorrect nonce at acc[%d]: expected %v, got %v", i, 100, nonce)
}
code, err := ls.GetCode(ctx, addr)
exp := []byte{i, i, i}
if err != nil {
t.Fatalf("Error getting code of acc[%d]: %v", i, err)
}
if !bytes.Equal(code, exp) {
t.Fatalf("Incorrect code at acc[%d]: expected %v, got %v", i, exp, code)
}
for j := byte(0); j < 101; j++ {
exp := common.Hash{i, j}
val, err := ls.GetState(ctx, addr, common.Hash{j})
if err != nil {
t.Fatalf("Error retrieving acc[%d].storage[%d]: %v", i, j, err)
}
if val != exp {
t.Fatalf("Retrieved wrong value from acc[%d].storage[%d]: expected %04x, got %04x", i, j, exp, val)
}
}
}
}
func TestLightStateSetCopy(t *testing.T) {
root, sdb := makeTestState()
ldb, _ := ethdb.NewMemDatabase()
odr := &testOdr{sdb: sdb, ldb: ldb}
ls := NewLightState(root, odr)
ctx := context.Background()
trie.ClearGlobalCache()
for i := byte(0); i < 100; i++ {
addr := common.Address{i}
err := ls.AddBalance(ctx, addr, big.NewInt(1000))
if err != nil {
t.Fatalf("Error adding balance to acc[%d]: %v", i, err)
}
err = ls.SetState(ctx, addr, common.Hash{100}, common.Hash{i, 100})
if err != nil {
t.Fatalf("Error setting storage of acc[%d]: %v", i, err)
}
}
ls2 := ls.Copy()
for i := byte(0); i < 100; i++ {
addr := common.Address{i}
err := ls2.AddBalance(ctx, addr, big.NewInt(1000))
if err != nil {
t.Fatalf("Error adding balance to acc[%d]: %v", i, err)
}
err = ls2.SetState(ctx, addr, common.Hash{100}, common.Hash{i, 200})
if err != nil {
t.Fatalf("Error setting storage of acc[%d]: %v", i, err)
}
}
lsx := ls.Copy()
ls.Set(ls2)
ls2.Set(lsx)
for i := byte(0); i < 100; i++ {
addr := common.Address{i}
// check balance in ls
bal, err := ls.GetBalance(ctx, addr)
if err != nil {
t.Fatalf("Error getting balance to acc[%d]: %v", i, err)
}
if bal.Int64() != int64(i)+2000 {
t.Fatalf("Incorrect balance at ls.acc[%d]: expected %v, got %v", i, int64(i)+1000, bal.Int64())
}
// check balance in ls2
bal, err = ls2.GetBalance(ctx, addr)
if err != nil {
t.Fatalf("Error getting balance to acc[%d]: %v", i, err)
}
if bal.Int64() != int64(i)+1000 {
t.Fatalf("Incorrect balance at ls.acc[%d]: expected %v, got %v", i, int64(i)+1000, bal.Int64())
}
// check storage in ls
exp := common.Hash{i, 200}
val, err := ls.GetState(ctx, addr, common.Hash{100})
if err != nil {
t.Fatalf("Error retrieving acc[%d].storage[100]: %v", i, err)
}
if val != exp {
t.Fatalf("Retrieved wrong value from acc[%d].storage[100]: expected %04x, got %04x", i, exp, val)
}
// check storage in ls2
exp = common.Hash{i, 100}
val, err = ls2.GetState(ctx, addr, common.Hash{100})
if err != nil {
t.Fatalf("Error retrieving acc[%d].storage[100]: %v", i, err)
}
if val != exp {
t.Fatalf("Retrieved wrong value from acc[%d].storage[100]: expected %04x, got %04x", i, exp, val)
}
}
}
func TestLightStateDelete(t *testing.T) {
root, sdb := makeTestState()
ldb, _ := ethdb.NewMemDatabase()
odr := &testOdr{sdb: sdb, ldb: ldb}
ls := NewLightState(root, odr)
ctx := context.Background()
trie.ClearGlobalCache()
addr := common.Address{42}
b, err := ls.HasAccount(ctx, addr)
if err != nil {
t.Fatalf("HasAccount error: %v", err)
}
if !b {
t.Fatalf("HasAccount returned false, expected true")
}
b, err = ls.IsDeleted(ctx, addr)
if err != nil {
t.Fatalf("IsDeleted error: %v", err)
}
if b {
t.Fatalf("IsDeleted returned true, expected false")
}
ls.Delete(ctx, addr)
b, err = ls.IsDeleted(ctx, addr)
if err != nil {
t.Fatalf("IsDeleted error: %v", err)
}
if !b {
t.Fatalf("IsDeleted returned false, expected true")
}
}

123
light/trie.go Normal file
View File

@ -0,0 +1,123 @@
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package light
import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/trie"
"golang.org/x/net/context"
)
// LightTrie is an ODR-capable wrapper around trie.SecureTrie
type LightTrie struct {
trie *trie.SecureTrie
originalRoot common.Hash
odr OdrBackend
db ethdb.Database
}
// NewLightTrie creates a new LightTrie instance. It doesn't instantly try to
// access the db or network and retrieve the root node, it only initializes its
// encapsulated SecureTrie at the first actual operation.
func NewLightTrie(root common.Hash, odr OdrBackend, useFakeMap bool) *LightTrie {
return &LightTrie{
// SecureTrie is initialized before first request
originalRoot: root,
odr: odr,
db: odr.Database(),
}
}
// retrieveKey retrieves a single key, returns true and stores nodes in local
// database if successful
func (t *LightTrie) retrieveKey(ctx context.Context, key []byte) bool {
r := &TrieRequest{root: t.originalRoot, key: key}
return t.odr.Retrieve(ctx, r) == nil
}
// do tries and retries to execute a function until it returns with no error or
// an error type other than MissingNodeError
func (t *LightTrie) do(ctx context.Context, fallbackKey []byte, fn func() error) error {
err := fn()
for err != nil {
mn, ok := err.(*trie.MissingNodeError)
if !ok {
return err
}
var key []byte
if mn.PrefixLen+mn.SuffixLen > 0 {
key = mn.Key
} else {
key = fallbackKey
}
if !t.retrieveKey(ctx, key) {
break
}
err = fn()
}
return err
}
// Get returns the value for key stored in the trie.
// The value bytes must not be modified by the caller.
func (t *LightTrie) Get(ctx context.Context, key []byte) (res []byte, err error) {
err = t.do(ctx, key, func() (err error) {
if t.trie == nil {
t.trie, err = trie.NewSecure(t.originalRoot, t.db)
}
if err == nil {
res, err = t.trie.TryGet(key)
}
return
})
return
}
// Update associates key with value in the trie. Subsequent calls to
// Get will return value. If value has length zero, any existing value
// is deleted from the trie and calls to Get will return nil.
//
// The value bytes must not be modified by the caller while they are
// stored in the trie.
func (t *LightTrie) Update(ctx context.Context, key, value []byte) (err error) {
err = t.do(ctx, key, func() (err error) {
if t.trie == nil {
t.trie, err = trie.NewSecure(t.originalRoot, t.db)
}
if err == nil {
err = t.trie.TryUpdate(key, value)
}
return
})
return
}
// Delete removes any existing value for key from the trie.
func (t *LightTrie) Delete(ctx context.Context, key []byte) (err error) {
err = t.do(ctx, key, func() (err error) {
if t.trie == nil {
t.trie, err = trie.NewSecure(t.originalRoot, t.db)
}
if err == nil {
err = t.trie.TryDelete(key)
}
return
})
return
}

21
trie/encoding.go
View File

@ -69,6 +69,27 @@ func compactHexDecode(str []byte) []byte {
return nibbles
}
// compactHexEncode encodes a series of nibbles into a byte array
func compactHexEncode(nibbles []byte) []byte {
nl := len(nibbles)
if nl == 0 {
return nil
}
if nibbles[nl-1] == 16 {
nl--
}
l := (nl + 1) / 2
var str = make([]byte, l)
for i, _ := range str {
b := nibbles[i*2] * 16
if nl > i*2 {
b += nibbles[i*2+1]
}
str[i] = b
}
return str
}
func decodeCompact(key []byte) []byte {
l := len(key) / 2
var res = make([]byte, l)

6
trie/encoding_test.go
View File

@ -57,6 +57,12 @@ func (s *TrieEncodingSuite) TestCompactHexDecode(c *checker.C) {
c.Assert(res, checker.DeepEquals, exp)
}
func (s *TrieEncodingSuite) TestCompactHexEncode(c *checker.C) {
exp := []byte("verb")
res := compactHexEncode([]byte{7, 6, 6, 5, 7, 2, 6, 2, 16})
c.Assert(res, checker.DeepEquals, exp)
}
func (s *TrieEncodingSuite) TestCompactDecode(c *checker.C) {
// odd compact decode
exp := []byte{1, 2, 3, 4, 5}

18
trie/errors.go
View File

@ -27,13 +27,23 @@ import (
// information necessary for retrieving the missing node through an ODR service.
//
// NodeHash is the hash of the missing node
//
// RootHash is the original root of the trie that contains the node
// KeyPrefix is the prefix that leads from the root to the missing node (hex encoded)
// KeySuffix (optional) contains the rest of the key we were looking for, gives a
// hint on which further nodes should also be retrieved (hex encoded)
//
// Key is a binary-encoded key that contains the prefix that leads to the first
// missing node and optionally a suffix that hints on which further nodes should
// also be retrieved
//
// PrefixLen is the nibble length of the key prefix that leads from the root to
// the missing node
//
// SuffixLen is the nibble length of the remaining part of the key that hints on
// which further nodes should also be retrieved (can be zero when there are no
// such hints in the error message)
type MissingNodeError struct {
RootHash, NodeHash common.Hash
KeyPrefix, KeySuffix []byte
Key []byte
PrefixLen, SuffixLen int
}
func (err *MissingNodeError) Error() string {

20
trie/proof.go
View File

@ -17,29 +17,30 @@ import (
// also included in the last node and can be retrieved by verifying
// the proof.
//
// The returned proof is nil if the trie does not contain a value for key.
// For existing keys, the proof will have at least one element.
// If the trie does not contain a value for key, the returned proof
// contains all nodes of the longest existing prefix of the key
// (at least the root node), ending with the node that proves the
// absence of the key.
func (t *Trie) Prove(key []byte) []rlp.RawValue {
// Collect all nodes on the path to key.
key = compactHexDecode(key)
nodes := []node{}
tn := t.root
for len(key) > 0 {
for len(key) > 0 && tn != nil {
switch n := tn.(type) {
case shortNode:
if len(key) < len(n.Key) || !bytes.Equal(n.Key, key[:len(n.Key)]) {
// The trie doesn't contain the key.
return nil
}
tn = nil
} else {
tn = n.Val
key = key[len(n.Key):]
}
nodes = append(nodes, n)
case fullNode:
tn = n[key[0]]
key = key[1:]
nodes = append(nodes, n)
case nil:
return nil
case hashNode:
var err error
tn, err = t.resolveHash(n, nil, nil)
@ -93,7 +94,12 @@ func VerifyProof(rootHash common.Hash, key []byte, proof []rlp.RawValue) (value
keyrest, cld := get(n, key)
switch cld := cld.(type) {
case nil:
if i != len(proof)-1 {
return nil, fmt.Errorf("key mismatch at proof node %d", i)
} else {
// The trie doesn't contain the key.
return nil, nil
}
case hashNode:
key = keyrest
wantHash = cld

5
trie/trie.go
View File

@ -394,8 +394,9 @@ func (t *Trie) resolveHash(n hashNode, prefix, suffix []byte) (node, error) {
return nil, &MissingNodeError{
RootHash: t.originalRoot,
NodeHash: common.BytesToHash(n),
KeyPrefix: prefix,
KeySuffix: suffix,
Key: compactHexEncode(append(prefix, suffix...)),
PrefixLen: len(prefix),
SuffixLen: len(suffix),
}
}
dec := mustDecodeNode(n, enc)