348 lines
12 KiB
Go
348 lines
12 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"bytes"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/rlp"
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)
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var (
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headHeaderKey = []byte("LastHeader")
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headBlockKey = []byte("LastBlock")
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blockPrefix = []byte("block-")
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blockNumPrefix = []byte("block-num-")
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headerSuffix = []byte("-header")
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bodySuffix = []byte("-body")
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tdSuffix = []byte("-td")
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ExpDiffPeriod = big.NewInt(100000)
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blockHashPre = []byte("block-hash-") // [deprecated by eth/63]
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)
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// CalcDifficulty is the difficulty adjustment algorithm. It returns
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// the difficulty that a new block b should have when created at time
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// given the parent block's time and difficulty.
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func CalcDifficulty(time, parentTime uint64, parentNumber, parentDiff *big.Int) *big.Int {
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diff := new(big.Int)
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adjust := new(big.Int).Div(parentDiff, params.DifficultyBoundDivisor)
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bigTime := new(big.Int)
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bigParentTime := new(big.Int)
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bigTime.SetUint64(time)
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bigParentTime.SetUint64(parentTime)
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if bigTime.Sub(bigTime, bigParentTime).Cmp(params.DurationLimit) < 0 {
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diff.Add(parentDiff, adjust)
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} else {
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diff.Sub(parentDiff, adjust)
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}
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if diff.Cmp(params.MinimumDifficulty) < 0 {
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diff = params.MinimumDifficulty
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}
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periodCount := new(big.Int).Add(parentNumber, common.Big1)
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periodCount.Div(periodCount, ExpDiffPeriod)
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if periodCount.Cmp(common.Big1) > 0 {
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// diff = diff + 2^(periodCount - 2)
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expDiff := periodCount.Sub(periodCount, common.Big2)
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expDiff.Exp(common.Big2, expDiff, nil)
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diff.Add(diff, expDiff)
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diff = common.BigMax(diff, params.MinimumDifficulty)
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}
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return diff
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}
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// CalcGasLimit computes the gas limit of the next block after parent.
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// The result may be modified by the caller.
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// This is miner strategy, not consensus protocol.
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func CalcGasLimit(parent *types.Block) *big.Int {
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// contrib = (parentGasUsed * 3 / 2) / 1024
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contrib := new(big.Int).Mul(parent.GasUsed(), big.NewInt(3))
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contrib = contrib.Div(contrib, big.NewInt(2))
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contrib = contrib.Div(contrib, params.GasLimitBoundDivisor)
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// decay = parentGasLimit / 1024 -1
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decay := new(big.Int).Div(parent.GasLimit(), params.GasLimitBoundDivisor)
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decay.Sub(decay, big.NewInt(1))
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/*
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strategy: gasLimit of block-to-mine is set based on parent's
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gasUsed value. if parentGasUsed > parentGasLimit * (2/3) then we
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increase it, otherwise lower it (or leave it unchanged if it's right
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at that usage) the amount increased/decreased depends on how far away
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from parentGasLimit * (2/3) parentGasUsed is.
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*/
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gl := new(big.Int).Sub(parent.GasLimit(), decay)
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gl = gl.Add(gl, contrib)
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gl.Set(common.BigMax(gl, params.MinGasLimit))
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// however, if we're now below the target (GenesisGasLimit) we increase the
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// limit as much as we can (parentGasLimit / 1024 -1)
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if gl.Cmp(params.GenesisGasLimit) < 0 {
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gl.Add(parent.GasLimit(), decay)
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gl.Set(common.BigMin(gl, params.GenesisGasLimit))
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}
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return gl
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}
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// GetCanonicalHash retrieves a hash assigned to a canonical block number.
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func GetCanonicalHash(db common.Database, number uint64) common.Hash {
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data, _ := db.Get(append(blockNumPrefix, big.NewInt(int64(number)).Bytes()...))
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if len(data) == 0 {
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return common.Hash{}
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}
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return common.BytesToHash(data)
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}
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// GetHeadHeaderHash retrieves the hash of the current canonical head block's
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// header. The difference between this and GetHeadBlockHash is that whereas the
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// last block hash is only updated upon a full block import, the last header
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// hash is updated already at header import, allowing head tracking for the
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// fast synchronization mechanism.
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func GetHeadHeaderHash(db common.Database) common.Hash {
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data, _ := db.Get(headHeaderKey)
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if len(data) == 0 {
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return common.Hash{}
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}
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return common.BytesToHash(data)
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}
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// GetHeadBlockHash retrieves the hash of the current canonical head block.
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func GetHeadBlockHash(db common.Database) common.Hash {
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data, _ := db.Get(headBlockKey)
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if len(data) == 0 {
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return common.Hash{}
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}
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return common.BytesToHash(data)
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}
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// GetHeaderRLP retrieves a block header in its raw RLP database encoding, or nil
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// if the header's not found.
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func GetHeaderRLP(db common.Database, hash common.Hash) rlp.RawValue {
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data, _ := db.Get(append(append(blockPrefix, hash[:]...), headerSuffix...))
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return data
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}
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// GetHeader retrieves the block header corresponding to the hash, nil if none
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// found.
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func GetHeader(db common.Database, hash common.Hash) *types.Header {
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data := GetHeaderRLP(db, hash)
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if len(data) == 0 {
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return nil
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}
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header := new(types.Header)
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if err := rlp.Decode(bytes.NewReader(data), header); err != nil {
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glog.V(logger.Error).Infof("invalid block header RLP for hash %x: %v", hash, err)
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return nil
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}
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return header
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}
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// GetBodyRLP retrieves the block body (transactions and uncles) in RLP encoding.
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func GetBodyRLP(db common.Database, hash common.Hash) rlp.RawValue {
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data, _ := db.Get(append(append(blockPrefix, hash[:]...), bodySuffix...))
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return data
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}
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// GetBody retrieves the block body (transactons, uncles) corresponding to the
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// hash, nil if none found.
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func GetBody(db common.Database, hash common.Hash) *types.Body {
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data := GetBodyRLP(db, hash)
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if len(data) == 0 {
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return nil
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}
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body := new(types.Body)
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if err := rlp.Decode(bytes.NewReader(data), body); err != nil {
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glog.V(logger.Error).Infof("invalid block body RLP for hash %x: %v", hash, err)
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return nil
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}
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return body
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}
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// GetTd retrieves a block's total difficulty corresponding to the hash, nil if
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// none found.
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func GetTd(db common.Database, hash common.Hash) *big.Int {
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data, _ := db.Get(append(append(blockPrefix, hash.Bytes()...), tdSuffix...))
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if len(data) == 0 {
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return nil
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}
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td := new(big.Int)
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if err := rlp.Decode(bytes.NewReader(data), td); err != nil {
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glog.V(logger.Error).Infof("invalid block total difficulty RLP for hash %x: %v", hash, err)
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return nil
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}
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return td
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}
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// GetBlock retrieves an entire block corresponding to the hash, assembling it
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// back from the stored header and body.
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func GetBlock(db common.Database, hash common.Hash) *types.Block {
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// Retrieve the block header and body contents
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header := GetHeader(db, hash)
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if header == nil {
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return nil
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}
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body := GetBody(db, hash)
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if body == nil {
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return nil
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}
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// Reassemble the block and return
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return types.NewBlockWithHeader(header).WithBody(body.Transactions, body.Uncles)
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}
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// WriteCanonicalHash stores the canonical hash for the given block number.
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func WriteCanonicalHash(db common.Database, hash common.Hash, number uint64) error {
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key := append(blockNumPrefix, big.NewInt(int64(number)).Bytes()...)
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if err := db.Put(key, hash.Bytes()); err != nil {
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glog.Fatalf("failed to store number to hash mapping into database: %v", err)
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return err
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}
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return nil
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}
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// WriteHeadHeaderHash stores the head header's hash.
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func WriteHeadHeaderHash(db common.Database, hash common.Hash) error {
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if err := db.Put(headHeaderKey, hash.Bytes()); err != nil {
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glog.Fatalf("failed to store last header's hash into database: %v", err)
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return err
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}
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return nil
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}
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// WriteHeadBlockHash stores the head block's hash.
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func WriteHeadBlockHash(db common.Database, hash common.Hash) error {
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if err := db.Put(headBlockKey, hash.Bytes()); err != nil {
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glog.Fatalf("failed to store last block's hash into database: %v", err)
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return err
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}
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return nil
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}
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// WriteHeader serializes a block header into the database.
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func WriteHeader(db common.Database, header *types.Header) error {
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data, err := rlp.EncodeToBytes(header)
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if err != nil {
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return err
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}
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key := append(append(blockPrefix, header.Hash().Bytes()...), headerSuffix...)
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if err := db.Put(key, data); err != nil {
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glog.Fatalf("failed to store header into database: %v", err)
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return err
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}
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glog.V(logger.Debug).Infof("stored header #%v [%x…]", header.Number, header.Hash().Bytes()[:4])
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return nil
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}
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// WriteBody serializes the body of a block into the database.
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func WriteBody(db common.Database, hash common.Hash, body *types.Body) error {
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data, err := rlp.EncodeToBytes(body)
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if err != nil {
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return err
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}
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key := append(append(blockPrefix, hash.Bytes()...), bodySuffix...)
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if err := db.Put(key, data); err != nil {
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glog.Fatalf("failed to store block body into database: %v", err)
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return err
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}
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glog.V(logger.Debug).Infof("stored block body [%x…]", hash.Bytes()[:4])
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return nil
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}
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// WriteTd serializes the total difficulty of a block into the database.
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func WriteTd(db common.Database, hash common.Hash, td *big.Int) error {
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data, err := rlp.EncodeToBytes(td)
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if err != nil {
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return err
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}
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key := append(append(blockPrefix, hash.Bytes()...), tdSuffix...)
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if err := db.Put(key, data); err != nil {
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glog.Fatalf("failed to store block total difficulty into database: %v", err)
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return err
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}
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glog.V(logger.Debug).Infof("stored block total difficulty [%x…]: %v", hash.Bytes()[:4], td)
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return nil
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}
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// WriteBlock serializes a block into the database, header and body separately.
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func WriteBlock(db common.Database, block *types.Block) error {
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// Store the body first to retain database consistency
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if err := WriteBody(db, block.Hash(), &types.Body{block.Transactions(), block.Uncles()}); err != nil {
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return err
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}
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// Store the header too, signaling full block ownership
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if err := WriteHeader(db, block.Header()); err != nil {
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return err
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}
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return nil
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}
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// DeleteCanonicalHash removes the number to hash canonical mapping.
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func DeleteCanonicalHash(db common.Database, number uint64) {
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db.Delete(append(blockNumPrefix, big.NewInt(int64(number)).Bytes()...))
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}
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// DeleteHeader removes all block header data associated with a hash.
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func DeleteHeader(db common.Database, hash common.Hash) {
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db.Delete(append(append(blockPrefix, hash.Bytes()...), headerSuffix...))
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}
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// DeleteBody removes all block body data associated with a hash.
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func DeleteBody(db common.Database, hash common.Hash) {
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db.Delete(append(append(blockPrefix, hash.Bytes()...), bodySuffix...))
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}
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// DeleteTd removes all block total difficulty data associated with a hash.
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func DeleteTd(db common.Database, hash common.Hash) {
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db.Delete(append(append(blockPrefix, hash.Bytes()...), tdSuffix...))
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}
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// DeleteBlock removes all block data associated with a hash.
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func DeleteBlock(db common.Database, hash common.Hash) {
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DeleteHeader(db, hash)
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DeleteBody(db, hash)
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DeleteTd(db, hash)
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}
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// [deprecated by eth/63]
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// GetBlockByHashOld returns the old combined block corresponding to the hash
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// or nil if not found. This method is only used by the upgrade mechanism to
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// access the old combined block representation. It will be dropped after the
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// network transitions to eth/63.
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func GetBlockByHashOld(db common.Database, hash common.Hash) *types.Block {
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data, _ := db.Get(append(blockHashPre, hash[:]...))
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if len(data) == 0 {
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return nil
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}
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var block types.StorageBlock
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if err := rlp.Decode(bytes.NewReader(data), &block); err != nil {
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glog.V(logger.Error).Infof("invalid block RLP for hash %x: %v", hash, err)
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return nil
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}
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return (*types.Block)(&block)
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}
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