5b283663b4
Assuming the following scenario where a miner has 15% of all hashing power and the ability to exert a moderate control over the network to the point where if the attacker sees a message A, it can't stop A from propagating, but what it **can** do is send a message B and ensure that most nodes see B before A. The attacker can then selfish mine and augment selfish mining strategy by giving his own blocks an advantage. This change makes the time at which a block is received less relevant and so the level of control an attacker has over the network no longer makes a difference. This change changes the current td algorithm `B_td > C_td` to the new algorithm `B_td > C_td || B_td == C_td && rnd < 0.5`.
123 lines
3.3 KiB
Go
123 lines
3.3 KiB
Go
// Copyright 2014 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 tests implements execution of Ethereum JSON tests.
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package tests
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import (
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"path/filepath"
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"github.com/ethereum/go-ethereum/core"
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)
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var (
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baseDir = filepath.Join(".", "files")
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blockTestDir = filepath.Join(baseDir, "BlockchainTests")
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stateTestDir = filepath.Join(baseDir, "StateTests")
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transactionTestDir = filepath.Join(baseDir, "TransactionTests")
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vmTestDir = filepath.Join(baseDir, "VMTests")
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rlpTestDir = filepath.Join(baseDir, "RLPTests")
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BlockSkipTests = []string{
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// These tests are not valid, as they are out of scope for RLP and
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// the consensus protocol.
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"BLOCK__RandomByteAtTheEnd",
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"TRANSCT__RandomByteAtTheEnd",
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"BLOCK__ZeroByteAtTheEnd",
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"TRANSCT__ZeroByteAtTheEnd",
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"ChainAtoChainB_blockorder2",
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"ChainAtoChainB_blockorder1",
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}
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/* Go client does not support transaction (account) nonces above 2^64. This
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technically breaks consensus but is regarded as "reasonable
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engineering constraint" as accounts cannot easily reach such high
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nonce values in practice
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*/
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TransSkipTests = []string{"TransactionWithHihghNonce256"}
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StateSkipTests = []string{}
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VmSkipTests = []string{}
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)
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// Disable reporting bad blocks for the tests
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func init() {
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core.DisableBadBlockReporting = true
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}
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func readJson(reader io.Reader, value interface{}) error {
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data, err := ioutil.ReadAll(reader)
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if err != nil {
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return fmt.Errorf("Error reading JSON file", err.Error())
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}
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if err = json.Unmarshal(data, &value); err != nil {
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if syntaxerr, ok := err.(*json.SyntaxError); ok {
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line := findLine(data, syntaxerr.Offset)
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return fmt.Errorf("JSON syntax error at line %v: %v", line, err)
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}
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return fmt.Errorf("JSON unmarshal error: %v", err)
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}
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return nil
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}
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func readJsonHttp(uri string, value interface{}) error {
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resp, err := http.Get(uri)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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err = readJson(resp.Body, value)
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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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func readJsonFile(fn string, value interface{}) error {
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file, err := os.Open(fn)
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if err != nil {
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return err
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}
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defer file.Close()
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err = readJson(file, value)
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if err != nil {
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return fmt.Errorf("%s in file %s", err.Error(), fn)
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}
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return nil
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}
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// findLine returns the line number for the given offset into data.
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func findLine(data []byte, offset int64) (line int) {
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line = 1
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for i, r := range string(data) {
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if int64(i) >= offset {
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return
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}
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if r == '\n' {
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line++
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}
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}
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return
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}
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