forked from cerc-io/plugeth
tests: add helper functions for block tests
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9326541820
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240
tests/blocktest.go
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240
tests/blocktest.go
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package tests
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import (
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"bytes"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"math/big"
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"runtime"
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"strconv"
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"strings"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/ethutil"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/state"
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)
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// Block Test JSON Format
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type btJSON struct {
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Blocks []btBlock
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GenesisBlockHeader btHeader
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Pre map[string]btAccount
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}
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type btAccount struct {
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Balance string
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Code string
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Nonce string
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Storage map[string]string
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}
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type btHeader struct {
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Bloom string
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Coinbase string
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MixHash string
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Nonce string
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Number string
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ParentHash string
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ReceiptTrie string
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SeedHash string
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StateRoot string
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TransactionsTrie string
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UncleHash string
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ExtraData string
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Difficulty string
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GasLimit string
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GasUsed string
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Timestamp string
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}
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type btTransaction struct {
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Data string
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GasLimit string
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GasPrice string
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Nonce string
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R string
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S string
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To string
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V string
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Value string
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}
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type btBlock struct {
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BlockHeader *btHeader
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Rlp string
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Transactions []btTransaction
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UncleHeaders []string
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}
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type BlockTest struct {
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Genesis *types.Block
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Blocks []*types.Block
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preAccounts map[string]btAccount
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}
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// LoadBlockTests loads a block test JSON file.
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func LoadBlockTests(file string) (map[string]*BlockTest, error) {
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bt := make(map[string]*btJSON)
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if err := loadJSON(file, &bt); err != nil {
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return nil, err
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}
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out := make(map[string]*BlockTest)
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for name, in := range bt {
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var err error
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if out[name], err = convertTest(in); err != nil {
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return nil, fmt.Errorf("bad test %q: %v", err)
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}
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}
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return out, nil
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}
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// InsertPreState populates the given database with the genesis
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// accounts defined by the test.
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func (t *BlockTest) InsertPreState(db ethutil.Database) error {
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statedb := state.New(nil, db)
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for addrString, acct := range t.preAccounts {
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// XXX: is is worth it checking for errors here?
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addr, _ := hex.DecodeString(addrString)
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code, _ := hex.DecodeString(strings.TrimPrefix(acct.Code, "0x"))
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balance, _ := new(big.Int).SetString(acct.Balance, 0)
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nonce, _ := strconv.ParseUint(acct.Nonce, 16, 64)
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obj := statedb.NewStateObject(addr)
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obj.SetCode(code)
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obj.SetBalance(balance)
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obj.SetNonce(nonce)
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// for k, v := range acct.Storage {
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// obj.SetState(k, v)
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// }
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}
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// sync objects to trie
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statedb.Update(nil)
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// sync trie to disk
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statedb.Sync()
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if !bytes.Equal(t.Genesis.Root(), statedb.Root()) {
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return errors.New("computed state root does not match genesis block")
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}
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return nil
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}
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func convertTest(in *btJSON) (out *BlockTest, err error) {
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// the conversion handles errors by catching panics.
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// you might consider this ugly, but the alternative (passing errors)
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// would be much harder to read.
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defer func() {
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if recovered := recover(); recovered != nil {
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buf := make([]byte, 64<<10)
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buf = buf[:runtime.Stack(buf, false)]
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err = fmt.Errorf("%v\n%s", recovered, buf)
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}
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}()
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out = &BlockTest{preAccounts: in.Pre}
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out.Genesis = mustConvertGenesis(in.GenesisBlockHeader)
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out.Blocks = mustConvertBlocks(in.Blocks)
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return out, err
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}
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func mustConvertGenesis(testGenesis btHeader) *types.Block {
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hdr := mustConvertHeader(testGenesis)
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hdr.Number = big.NewInt(0)
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b := types.NewBlockWithHeader(hdr)
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b.Td = new(big.Int)
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b.Reward = new(big.Int)
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return b
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}
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func mustConvertHeader(in btHeader) *types.Header {
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// hex decode these fields
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return &types.Header{
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SeedHash: mustConvertBytes(in.SeedHash),
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MixDigest: mustConvertBytes(in.MixHash),
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Bloom: mustConvertBytes(in.Bloom),
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ReceiptHash: mustConvertBytes(in.ReceiptTrie),
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TxHash: mustConvertBytes(in.TransactionsTrie),
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Root: mustConvertBytes(in.StateRoot),
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Coinbase: mustConvertBytes(in.Coinbase),
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UncleHash: mustConvertBytes(in.UncleHash),
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ParentHash: mustConvertBytes(in.ParentHash),
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Nonce: mustConvertBytes(in.Nonce),
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Extra: string(mustConvertBytes(in.ExtraData)),
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GasUsed: mustConvertBigInt10(in.GasUsed),
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GasLimit: mustConvertBigInt10(in.GasLimit),
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Difficulty: mustConvertBigInt10(in.Difficulty),
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Time: mustConvertUint(in.Timestamp),
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}
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}
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func mustConvertBlocks(testBlocks []btBlock) []*types.Block {
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var out []*types.Block
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for i, inb := range testBlocks {
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var b types.Block
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r := bytes.NewReader(mustConvertBytes(inb.Rlp))
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if err := rlp.Decode(r, &b); err != nil {
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panic(fmt.Errorf("invalid block %d: %q", i, inb.Rlp))
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}
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out = append(out, &b)
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}
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return out
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}
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func mustConvertBytes(in string) []byte {
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out, err := hex.DecodeString(strings.TrimPrefix(in, "0x"))
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if err != nil {
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panic(fmt.Errorf("invalid hex: %q", in))
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}
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return out
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}
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func mustConvertBigInt10(in string) *big.Int {
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out, ok := new(big.Int).SetString(in, 10)
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if !ok {
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panic(fmt.Errorf("invalid integer: %q", in))
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}
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return out
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}
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func mustConvertUint(in string) uint64 {
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out, err := strconv.ParseUint(in, 0, 64)
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if err != nil {
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panic(fmt.Errorf("invalid integer: %q", in))
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}
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return out
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}
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// loadJSON reads the given file and unmarshals its content.
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func loadJSON(file string, val interface{}) error {
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content, err := ioutil.ReadFile(file)
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if err != nil {
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return err
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}
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if err := json.Unmarshal(content, val); err != nil {
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if syntaxerr, ok := err.(*json.SyntaxError); ok {
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line := findLine(content, syntaxerr.Offset)
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return fmt.Errorf("JSON syntax error at %v:%v: %v", file, line, err)
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}
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return fmt.Errorf("JSON unmarshal error in %v: %v", file, err)
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}
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return nil
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}
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// findLine returns the line number for the given offset into data.
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func findLine(data []byte, offset int64) (line int) {
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line = 1
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for i, r := range string(data) {
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if int64(i) >= offset {
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return
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}
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if r == '\n' {
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line++
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}
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}
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return
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}
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