package tests
import (
"bytes"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"math/big"
"runtime"
"strconv"
"strings"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/core/state"
)
// Block Test JSON Format
type btJSON struct {
Blocks []btBlock
GenesisBlockHeader btHeader
Pre map[string]btAccount
PostState map[string]btAccount
}
type btAccount struct {
Balance string
Code string
Nonce string
Storage map[string]string
}
type btHeader struct {
Bloom string
Coinbase string
MixHash string
Nonce string
Number string
ParentHash string
ReceiptTrie string
SeedHash string
StateRoot string
TransactionsTrie string
UncleHash string
ExtraData string
Difficulty string
GasLimit string
GasUsed string
Timestamp string
}
type btTransaction struct {
Data string
GasLimit string
GasPrice string
Nonce string
R string
S string
To string
V string
Value string
}
type btBlock struct {
BlockHeader *btHeader
Rlp string
Transactions []btTransaction
UncleHeaders []string
}
type BlockTest struct {
Genesis *types.Block
Blocks []*types.Block
preAccounts map[string]btAccount
}
// LoadBlockTests loads a block test JSON file.
func LoadBlockTests(file string) (map[string]*BlockTest, error) {
bt := make(map[string]*btJSON)
if err := loadJSON(file, &bt); err != nil {
return nil, err
}
out := make(map[string]*BlockTest)
for name, in := range bt {
var err error
if out[name], err = convertTest(in); err != nil {
return nil, fmt.Errorf("bad test %q: %v", err)
}
}
return out, nil
}
// InsertPreState populates the given database with the genesis
// accounts defined by the test.
func (t *BlockTest) InsertPreState(db common.Database) (*state.StateDB, error) {
statedb := state.New(common.Hash{}, db)
for addrString, acct := range t.preAccounts {
// XXX: is is worth it checking for errors here?
//addr, _ := hex.DecodeString(addrString)
code, _ := hex.DecodeString(strings.TrimPrefix(acct.Code, "0x"))
balance, _ := new(big.Int).SetString(acct.Balance, 0)
nonce, _ := strconv.ParseUint(acct.Nonce, 16, 64)
obj := statedb.NewStateObject(common.HexToAddress(addrString))
obj.SetCode(code)
obj.SetBalance(balance)
obj.SetNonce(nonce)
// for k, v := range acct.Storage {
// obj.SetState(k, v)
// }
}
// sync objects to trie
statedb.Update(nil)
// sync trie to disk
statedb.Sync()
if !bytes.Equal(t.Genesis.Root().Bytes(), statedb.Root().Bytes()) {
return nil, errors.New("computed state root does not match genesis block")
}
return statedb, nil
}
func (t *BlockTest) ValidatePostState(statedb *state.StateDB) error {
for addrString, acct := range t.preAccounts {
// XXX: is is worth it checking for errors here?
addr, _ := hex.DecodeString(addrString)
code, _ := hex.DecodeString(strings.TrimPrefix(acct.Code, "0x"))
balance, _ := new(big.Int).SetString(acct.Balance, 0)
nonce, _ := strconv.ParseUint(acct.Nonce, 16, 64)
// address is indirectly verified by the other fields, as it's the db key
code2 := statedb.GetCode(common.BytesToAddress(addr))
balance2 := statedb.GetBalance(common.BytesToAddress(addr))
nonce2 := statedb.GetNonce(common.BytesToAddress(addr))
if !bytes.Equal(code2, code) {
return fmt.Errorf("account code mismatch, addr, found, expected: ", addrString, hex.EncodeToString(code2), hex.EncodeToString(code))
}
if balance2.Cmp(balance) != 0 {
return fmt.Errorf("account balance mismatch, addr, found, expected: ", addrString, balance2, balance)
}
if nonce2 != nonce {
return fmt.Errorf("account nonce mismatch, addr, found, expected: ", addrString, nonce2, nonce)
}
}
return nil
}
func convertTest(in *btJSON) (out *BlockTest, err error) {
// the conversion handles errors by catching panics.
// you might consider this ugly, but the alternative (passing errors)
// would be much harder to read.
defer func() {
if recovered := recover(); recovered != nil {
buf := make([]byte, 64<<10)
buf = buf[:runtime.Stack(buf, false)]
err = fmt.Errorf("%v\n%s", recovered, buf)
}
}()
out = &BlockTest{preAccounts: in.Pre}
out.Genesis = mustConvertGenesis(in.GenesisBlockHeader)
out.Blocks = mustConvertBlocks(in.Blocks)
return out, err
}
func mustConvertGenesis(testGenesis btHeader) *types.Block {
hdr := mustConvertHeader(testGenesis)
hdr.Number = big.NewInt(0)
b := types.NewBlockWithHeader(hdr)
b.Td = new(big.Int)
b.Reward = new(big.Int)
return b
}
func mustConvertHeader(in btHeader) *types.Header {
// hex decode these fields
header := &types.Header{
//SeedHash: mustConvertBytes(in.SeedHash),
MixDigest: mustConvertHash(in.MixHash),
Bloom: mustConvertBloom(in.Bloom),
ReceiptHash: mustConvertHash(in.ReceiptTrie),
TxHash: mustConvertHash(in.TransactionsTrie),
Root: mustConvertHash(in.StateRoot),
Coinbase: mustConvertAddress(in.Coinbase),
UncleHash: mustConvertHash(in.UncleHash),
ParentHash: mustConvertHash(in.ParentHash),
Extra: string(mustConvertBytes(in.ExtraData)),
GasUsed: mustConvertBigInt10(in.GasUsed),
GasLimit: mustConvertBigInt10(in.GasLimit),
Difficulty: mustConvertBigInt10(in.Difficulty),
Time: mustConvertUint(in.Timestamp),
}
// XXX cheats? :-)
header.SetNonce(common.BytesToHash(mustConvertBytes(in.Nonce)).Big().Uint64())
return header
}
func mustConvertBlocks(testBlocks []btBlock) []*types.Block {
var out []*types.Block
for i, inb := range testBlocks {
var b types.Block
r := bytes.NewReader(mustConvertBytes(inb.Rlp))
if err := rlp.Decode(r, &b); err != nil {
panic(fmt.Errorf("invalid block %d: %q", i, inb.Rlp))
}
out = append(out, &b)
}
return out
}
func mustConvertBytes(in string) []byte {
out, err := hex.DecodeString(strings.TrimPrefix(in, "0x"))
if err != nil {
panic(fmt.Errorf("invalid hex: %q", in))
}
return out
}
func mustConvertHash(in string) common.Hash {
out, err := hex.DecodeString(strings.TrimPrefix(in, "0x"))
if err != nil {
panic(fmt.Errorf("invalid hex: %q", in))
}
return common.BytesToHash(out)
}
func mustConvertAddress(in string) common.Address {
out, err := hex.DecodeString(strings.TrimPrefix(in, "0x"))
if err != nil {
panic(fmt.Errorf("invalid hex: %q", in))
}
return common.BytesToAddress(out)
}
func mustConvertBloom(in string) types.Bloom {
out, err := hex.DecodeString(strings.TrimPrefix(in, "0x"))
if err != nil {
panic(fmt.Errorf("invalid hex: %q", in))
}
return types.BytesToBloom(out)
}
func mustConvertBigInt10(in string) *big.Int {
out, ok := new(big.Int).SetString(in, 10)
if !ok {
panic(fmt.Errorf("invalid integer: %q", in))
}
return out
}
func mustConvertUint(in string) uint64 {
out, err := strconv.ParseUint(in, 0, 64)
if err != nil {
panic(fmt.Errorf("invalid integer: %q", in))
}
return out
}
// loadJSON reads the given file and unmarshals its content.
func loadJSON(file string, val interface{}) error {
content, err := ioutil.ReadFile(file)
if err != nil {
return err
}
if err := json.Unmarshal(content, val); err != nil {
if syntaxerr, ok := err.(*json.SyntaxError); ok {
line := findLine(content, syntaxerr.Offset)
return fmt.Errorf("JSON syntax error at %v:%v: %v", file, line, err)
}
return fmt.Errorf("JSON unmarshal error in %v: %v", file, err)
}
return nil
}
// findLine returns the line number for the given offset into data.
func findLine(data []byte, offset int64) (line int) {
line = 1
for i, r := range string(data) {
if int64(i) >= offset {
return
}
if r == '\n' {
line++
}
}
return
}
