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params: reduce extra data to 32 bytes

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This commit is contained in:
Jeffrey Wilcke
2015-07-26 12:24:52 +02:00
parent 73a576c9af
commit 1e241e84f7
3 changed files with 13 additions and 4 deletions
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5
eth/backend.go
View File

@@ -45,6 +45,7 @@ import (
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/nat"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/whisper"
)
@@ -370,8 +371,8 @@ func New(config *Config) (*Ethereum, error) {
eth.miner.SetGasPrice(config.GasPrice)
extra := config.Name
if len(extra) > 1024 {
extra = extra[:1024]
if uint64(len(extra)) > params.MaximumExtraDataSize.Uint64() {
extra = extra[:params.MaximumExtraDataSize.Uint64()]
}
eth.miner.SetExtra([]byte(extra))

4
params/protocol_params.go
View File

@@ -22,7 +22,7 @@ package params
import "math/big"
var (
MaximumExtraDataSize = big.NewInt(1024) // Maximum size extra data may be after Genesis.
MaximumExtraDataSize = big.NewInt(32) // Maximum size extra data may be after Genesis.
ExpByteGas = big.NewInt(10) // Times ceil(log256(exponent)) for the EXP instruction.
SloadGas = big.NewInt(50) // Multiplied by the number of 32-byte words that are copied (round up) for any *COPY operation and added.
CallValueTransferGas = big.NewInt(9000) // Paid for CALL when the value transfor is non-zero.
@@ -32,7 +32,7 @@ var (
DifficultyBoundDivisor = big.NewInt(2048) // The bound divisor of the difficulty, used in the update calculations.
QuadCoeffDiv = big.NewInt(512) // Divisor for the quadratic particle of the memory cost equation.
GenesisDifficulty = big.NewInt(131072) // Difficulty of the Genesis block.
DurationLimit = big.NewInt(8) // The decision boundary on the blocktime duration used to determine whether difficulty should go up or not.
DurationLimit = big.NewInt(13) // The decision boundary on the blocktime duration used to determine whether difficulty should go up or not.
SstoreSetGas = big.NewInt(20000) // Once per SLOAD operation.
LogDataGas = big.NewInt(8) // Per byte in a LOG* operation's data.
CallStipend = big.NewInt(2300) // Free gas given at beginning of call.

8
rpc/api/miner.go
View File

@@ -17,9 +17,12 @@
package api
import (
"fmt"
"github.com/ethereum/ethash"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rpc/codec"
"github.com/ethereum/go-ethereum/rpc/shared"
)
@@ -122,6 +125,11 @@ func (self *minerApi) SetExtra(req *shared.Request) (interface{}, error) {
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, err
}
if uint64(len(args.Data)) > params.MaximumExtraDataSize.Uint64()*2 {
return false, fmt.Errorf("extra datasize can be no longer than %v bytes", params.MaximumExtraDataSize)
}
self.ethereum.Miner().SetExtra([]byte(args.Data))
return true, nil
}