mirror of https://github.com/ethereum/go-ethereum
`geth recover` now accepts both hashes and numbers using "#" and no longer requires the ethereum instance.pull/1373/head
Jeffrey Wilcke
9 years ago
parent
bb418a43c1
commit
70d5d791cc
@ -0,0 +1,98 @@ |
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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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// 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 int64, parentTime int64, 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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if big.NewInt(time-parentTime).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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return params.MinimumDifficulty |
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} |
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return diff |
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} |
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// CalcTD computes the total difficulty of block.
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func CalcTD(block, parent *types.Block) *big.Int { |
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if parent == nil { |
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return block.Difficulty() |
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} |
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d := block.Difficulty() |
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d.Add(d, parent.Td) |
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return d |
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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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func CalcGasLimit(parent *types.Block) *big.Int { |
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decay := new(big.Int).Div(parent.GasLimit(), params.GasLimitBoundDivisor) |
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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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gl := new(big.Int).Sub(parent.GasLimit(), decay) |
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gl = gl.Add(gl, contrib) |
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gl = gl.Add(gl, big.NewInt(1)) |
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gl.Set(common.BigMax(gl, params.MinGasLimit)) |
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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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// GetBlockByHash returns the block corresponding to the hash or nil if not found
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func GetBlockByHash(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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// GetBlockByHash returns the canonical block by number or nil if not found
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func GetBlockByNumber(db common.Database, number uint64) *types.Block { |
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key, _ := db.Get(append(blockNumPre, big.NewInt(int64(number)).Bytes()...)) |
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if len(key) == 0 { |
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return nil |
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} |
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return GetBlockByHash(db, common.BytesToHash(key)) |
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} |
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// WriteHead force writes the current head
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func WriteHead(db common.Database, block *types.Block) error { |
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key := append(blockNumPre, block.Number().Bytes()...) |
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err := db.Put(key, block.Hash().Bytes()) |
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if err != nil { |
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return err |
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} |
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err = db.Put([]byte("LastBlock"), block.Hash().Bytes()) |
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if 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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