path: root/tests/blocktest.go

package tests

import (
    "bytes"
    "encoding/hex"
    "encoding/json"
    "errors"
    "fmt"
    "io/ioutil"
    "math/big"
    "runtime"
    "strconv"
    "strings"

    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/rlp"
    "github.com/ethereum/go-ethereum/state"
)

// Block Test JSON Format

type btJSON struct {
    Blocks             []btBlock
    GenesisBlockHeader btHeader
    Pre                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) error {
    statedb := state.New(nil, 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(addr)
        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(), statedb.Root()) {
        return errors.New("computed state root does not match genesis block")
    }
    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
    return &types.Header{
        //SeedHash:    mustConvertBytes(in.SeedHash),
        MixDigest:   mustConvertBytes(in.MixHash),
        Bloom:       mustConvertBytes(in.Bloom),
        ReceiptHash: mustConvertBytes(in.ReceiptTrie),
        TxHash:      mustConvertBytes(in.TransactionsTrie),
        Root:        mustConvertBytes(in.StateRoot),
        Coinbase:    mustConvertBytes(in.Coinbase),
        UncleHash:   mustConvertBytes(in.UncleHash),
        ParentHash:  mustConvertBytes(in.ParentHash),
        Nonce:       mustConvertBytes(in.Nonce),
        Extra:       string(mustConvertBytes(in.ExtraData)),
        GasUsed:     mustConvertBigInt10(in.GasUsed),
        GasLimit:    mustConvertBigInt10(in.GasLimit),
        Difficulty:  mustConvertBigInt10(in.Difficulty),
        Time:        mustConvertUint(in.Timestamp),
    }
}

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 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
}