path: root/ethchain/block.go

package ethchain

import (
    "bytes"
    "fmt"
    "math/big"
    _ "strconv"
    "time"

    "github.com/ethereum/eth-go/ethcrypto"
    "github.com/ethereum/eth-go/ethstate"
    "github.com/ethereum/eth-go/ethtrie"
    "github.com/ethereum/eth-go/ethutil"
)

type BlockInfo struct {
    Number uint64
    Hash   []byte
    Parent []byte
}

func (bi *BlockInfo) RlpDecode(data []byte) {
    decoder := ethutil.NewValueFromBytes(data)

    bi.Number = decoder.Get(0).Uint()
    bi.Hash = decoder.Get(1).Bytes()
    bi.Parent = decoder.Get(2).Bytes()
}

func (bi *BlockInfo) RlpEncode() []byte {
    return ethutil.Encode([]interface{}{bi.Number, bi.Hash, bi.Parent})
}

type Block struct {
    // Hash to the previous block
    PrevHash []byte
    // Uncles of this block
    Uncles   []*Block
    UncleSha []byte
    // The coin base address
    Coinbase []byte
    // Block Trie state
    //state *ethutil.Trie
    state *ethstate.State
    // Difficulty for the current block
    Difficulty *big.Int
    // Creation time
    Time int64
    // The block number
    Number *big.Int
    // Minimum Gas Price
    MinGasPrice *big.Int
    // Gas limit
    GasLimit *big.Int
    // Gas used
    GasUsed *big.Int
    // Extra data
    Extra string
    // Block Nonce for verification
    Nonce []byte
    // List of transactions and/or contracts
    transactions []*Transaction
    receipts     []*Receipt
    TxSha        []byte
}

func NewBlockFromBytes(raw []byte) *Block {
    block := &Block{}
    block.RlpDecode(raw)

    return block
}

// New block takes a raw encoded string
func NewBlockFromRlpValue(rlpValue *ethutil.Value) *Block {
    block := &Block{}
    block.RlpValueDecode(rlpValue)

    return block
}

func CreateBlock(root interface{},
    prevHash []byte,
    base []byte,
    Difficulty *big.Int,
    Nonce []byte,
    extra string) *Block {

    block := &Block{
        PrevHash:    prevHash,
        Coinbase:    base,
        Difficulty:  Difficulty,
        Nonce:       Nonce,
        Time:        time.Now().Unix(),
        Extra:       extra,
        UncleSha:    EmptyShaList,
        GasUsed:     new(big.Int),
        MinGasPrice: new(big.Int),
        GasLimit:    new(big.Int),
    }
    block.SetUncles([]*Block{})

    block.state = ethstate.NewState(ethtrie.NewTrie(ethutil.Config.Db, root))

    return block
}

// Returns a hash of the block
func (block *Block) Hash() []byte {
    return ethcrypto.Sha3Bin(block.Value().Encode())
}

func (block *Block) HashNoNonce() []byte {
    return ethcrypto.Sha3Bin(ethutil.Encode([]interface{}{block.PrevHash,
        block.UncleSha, block.Coinbase, block.state.Trie.Root,
        block.TxSha, block.Difficulty, block.Number, block.MinGasPrice,
        block.GasLimit, block.GasUsed, block.Time, block.Extra}))
}

func (block *Block) State() *ethstate.State {
    return block.state
}

func (block *Block) Transactions() []*Transaction {
    return block.transactions
}

func (block *Block) PayFee(addr []byte, fee *big.Int) bool {
    contract := block.state.GetStateObject(addr)
    // If we can't pay the fee return
    if contract == nil || contract.Amount.Cmp(fee) < 0 /* amount < fee */ {
        fmt.Println("Contract has insufficient funds", contract.Amount, fee)

        return false
    }

    base := new(big.Int)
    contract.Amount = base.Sub(contract.Amount, fee)
    block.state.Trie.Update(string(addr), string(contract.RlpEncode()))

    data := block.state.Trie.Get(string(block.Coinbase))

    // Get the ether (Coinbase) and add the fee (gief fee to miner)
    account := ethstate.NewStateObjectFromBytes(block.Coinbase, []byte(data))

    base = new(big.Int)
    account.Amount = base.Add(account.Amount, fee)

    //block.state.Trie.Update(string(block.Coinbase), string(ether.RlpEncode()))
    block.state.UpdateStateObject(account)

    return true
}

func (block *Block) CalcGasLimit(parent *Block) *big.Int {
    if block.Number.Cmp(big.NewInt(0)) == 0 {
        return ethutil.BigPow(10, 6)
    }

    previous := new(big.Int).Mul(big.NewInt(1023), parent.GasLimit)
    current := new(big.Rat).Mul(new(big.Rat).SetInt(block.GasUsed), big.NewRat(6, 5))
    curInt := new(big.Int).Div(current.Num(), current.Denom())

    result := new(big.Int).Add(previous, curInt)
    result.Div(result, big.NewInt(1024))

    min := big.NewInt(125000)

    return ethutil.BigMax(min, result)
    /*
        base := new(big.Int)
        base2 := new(big.Int)
        parentGL := bc.CurrentBlock.GasLimit
        parentUsed := bc.CurrentBlock.GasUsed

        base.Mul(parentGL, big.NewInt(1024-1))
        base2.Mul(parentUsed, big.NewInt(6))
        base2.Div(base2, big.NewInt(5))
        base.Add(base, base2)
        base.Div(base, big.NewInt(1024))
    */

}

func (block *Block) BlockInfo() BlockInfo {
    bi := BlockInfo{}
    data, _ := ethutil.Config.Db.Get(append(block.Hash(), []byte("Info")...))
    bi.RlpDecode(data)

    return bi
}

func (self *Block) GetTransaction(hash []byte) *Transaction {
    for _, receipt := range self.receipts {
        if bytes.Compare(receipt.Tx.Hash(), hash) == 0 {
            return receipt.Tx
        }
    }

    return nil
}

// Sync the block's state and contract respectively
func (block *Block) Sync() {
    block.state.Sync()
}

func (block *Block) Undo() {
    // Sync the block state itself
    block.state.Reset()
}

/////// Block Encoding
func (block *Block) rlpReceipts() interface{} {
    // Marshal the transactions of this block
    encR := make([]interface{}, len(block.receipts))
    for i, r := range block.receipts {
        // Cast it to a string (safe)
        encR[i] = r.RlpData()
    }

    return encR
}

func (block *Block) rlpUncles() interface{} {
    // Marshal the transactions of this block
    uncles := make([]interface{}, len(block.Uncles))
    for i, uncle := range block.Uncles {
        // Cast it to a string (safe)
        uncles[i] = uncle.header()
    }

    return uncles
}

func (block *Block) SetUncles(uncles []*Block) {
    block.Uncles = uncles

    // Sha of the concatenated uncles
    block.UncleSha = ethcrypto.Sha3Bin(ethutil.Encode(block.rlpUncles()))
}

func (self *Block) SetReceipts(receipts []*Receipt, txs []*Transaction) {
    self.receipts = receipts
    self.setTransactions(txs)
}

func (block *Block) setTransactions(txs []*Transaction) {
    block.transactions = txs

    /*
        trie := ethtrie.NewTrie(ethutil.Config.Db, "")
        for i, tx := range txs {
            trie.Update(strconv.Itoa(i), string(tx.RlpEncode()))
        }

        switch trie.Root.(type) {
        case string:
            block.TxSha = []byte(trie.Root.(string))
        case []byte:
            block.TxSha = trie.Root.([]byte)
        default:
            panic(fmt.Sprintf("invalid root type %T", trie.Root))
        }
    */
}

func CreateTxSha(receipts Receipts) (sha []byte) {
    trie := ethtrie.NewTrie(ethutil.Config.Db, "")
    for i, receipt := range receipts {
        trie.Update(string(ethutil.NewValue(i).Encode()), string(ethutil.NewValue(receipt.RlpData()).Encode()))
    }

    switch trie.Root.(type) {
    case string:
        sha = []byte(trie.Root.(string))
    case []byte:
        sha = trie.Root.([]byte)
    default:
        panic(fmt.Sprintf("invalid root type %T", trie.Root))
    }

    return sha
}

func (self *Block) SetTxHash(receipts Receipts) {
    self.TxSha = CreateTxSha(receipts)
}

func (block *Block) Value() *ethutil.Value {
    return ethutil.NewValue([]interface{}{block.header(), block.rlpReceipts(), block.rlpUncles()})
}

func (block *Block) RlpEncode() []byte {
    // Encode a slice interface which contains the header and the list of
    // transactions.
    return block.Value().Encode()
}

func (block *Block) RlpDecode(data []byte) {
    rlpValue := ethutil.NewValueFromBytes(data)
    block.RlpValueDecode(rlpValue)
}

func (block *Block) RlpValueDecode(decoder *ethutil.Value) {
    header := decoder.Get(0)

    block.PrevHash = header.Get(0).Bytes()
    block.UncleSha = header.Get(1).Bytes()
    block.Coinbase = header.Get(2).Bytes()
    block.state = ethstate.NewState(ethtrie.NewTrie(ethutil.Config.Db, header.Get(3).Val))
    block.TxSha = header.Get(4).Bytes()
    block.Difficulty = header.Get(5).BigInt()
    block.Number = header.Get(6).BigInt()
    //fmt.Printf("#%v : %x\n", block.Number, block.Coinbase)
    block.MinGasPrice = header.Get(7).BigInt()
    block.GasLimit = header.Get(8).BigInt()
    block.GasUsed = header.Get(9).BigInt()
    block.Time = int64(header.Get(10).BigInt().Uint64())
    block.Extra = header.Get(11).Str()
    block.Nonce = header.Get(12).Bytes()

    // Tx list might be empty if this is an uncle. Uncles only have their
    // header set.
    if decoder.Get(1).IsNil() == false { // Yes explicitness
        receipts := decoder.Get(1)
        block.transactions = make([]*Transaction, receipts.Len())
        block.receipts = make([]*Receipt, receipts.Len())
        for i := 0; i < receipts.Len(); i++ {
            receipt := NewRecieptFromValue(receipts.Get(i))
            block.transactions[i] = receipt.Tx
            block.receipts[i] = receipt
        }

    }

    if decoder.Get(2).IsNil() == false { // Yes explicitness
        uncles := decoder.Get(2)
        block.Uncles = make([]*Block, uncles.Len())
        for i := 0; i < uncles.Len(); i++ {
            block.Uncles[i] = NewUncleBlockFromValue(uncles.Get(i))
        }
    }

}

func NewUncleBlockFromValue(header *ethutil.Value) *Block {
    block := &Block{}

    block.PrevHash = header.Get(0).Bytes()
    block.UncleSha = header.Get(1).Bytes()
    block.Coinbase = header.Get(2).Bytes()
    block.state = ethstate.NewState(ethtrie.NewTrie(ethutil.Config.Db, header.Get(3).Val))
    block.TxSha = header.Get(4).Bytes()
    block.Difficulty = header.Get(5).BigInt()
    block.Number = header.Get(6).BigInt()
    block.MinGasPrice = header.Get(7).BigInt()
    block.GasLimit = header.Get(8).BigInt()
    block.GasUsed = header.Get(9).BigInt()
    block.Time = int64(header.Get(10).BigInt().Uint64())
    block.Extra = header.Get(11).Str()
    block.Nonce = header.Get(12).Bytes()

    return block
}

func (block *Block) GetRoot() interface{} {
    return block.state.Trie.Root
}

func (self *Block) Receipts() []*Receipt {
    return self.receipts
}

func (block *Block) header() []interface{} {
    return []interface{}{
        // Sha of the previous block
        block.PrevHash,
        // Sha of uncles
        block.UncleSha,
        // Coinbase address
        block.Coinbase,
        // root state
        block.state.Trie.Root,
        // Sha of tx
        block.TxSha,
        // Current block Difficulty
        block.Difficulty,
        // The block number
        block.Number,
        // Block minimum gas price
        block.MinGasPrice,
        // Block upper gas bound
        block.GasLimit,
        // Block gas used
        block.GasUsed,
        // Time the block was found?
        block.Time,
        // Extra data
        block.Extra,
        // Block's Nonce for validation
        block.Nonce,
    }
}

func (block *Block) String() string {
    return fmt.Sprintf(`
    BLOCK(%x):
    PrevHash:   %x
    UncleSha:   %x
    Coinbase:   %x
    Root:       %x
    TxSha:      %x
    Difficulty: %v
    Number:     %v
    MinGas:     %v
    MaxLimit:   %v
    GasUsed:    %v
    Time:       %v
    Extra:      %v
    Nonce:      %x
    NumTx:      %v
`,
        block.Hash(),
        block.PrevHash,
        block.UncleSha,
        block.Coinbase,
        block.state.Trie.Root,
        block.TxSha,
        block.Difficulty,
        block.Number,
        block.MinGasPrice,
        block.GasLimit,
        block.GasUsed,
        block.Time,
        block.Extra,
        block.Nonce,
        len(block.transactions),
    )
}