mirror of https://github.com/ethereum/go-ethereum
Péter Szilágyi
8 years ago
committed by
Felix Lange
parent
df72e20cc5
commit
b7d93500f1
@ -1,14 +0,0 @@ |
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cmake_minimum_required(VERSION 2.8.7) |
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project(ethash) |
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|
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set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/modules/") |
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set(ETHHASH_LIBS ethash) |
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|
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if (WIN32 AND WANT_CRYPTOPP) |
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add_subdirectory(cryptopp) |
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endif() |
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add_subdirectory(src/libethash) |
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add_subdirectory(src/benchmark EXCLUDE_FROM_ALL) |
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add_subdirectory(test/c) |
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@ -1,17 +0,0 @@ |
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include setup.py |
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# C sources |
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include src/libethash/internal.c |
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include src/libethash/sha3.c |
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include src/libethash/util.c |
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include src/python/core.c |
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|
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# Headers |
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include src/libethash/compiler.h |
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include src/libethash/data_sizes.h |
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include src/libethash/endian.h |
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include src/libethash/ethash.h |
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include src/libethash/fnv.h |
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include src/libethash/internal.h |
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include src/libethash/sha3.h |
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include src/libethash/util.h |
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@ -1,6 +0,0 @@ |
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.PHONY: clean test |
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test: |
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./test/test.sh
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clean: |
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rm -rf *.so pyethash.egg-info/ build/ test/python/python-virtual-env/ test/c/build/ pyethash.so test/python/*.pyc dist/ MANIFEST
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@ -1,22 +0,0 @@ |
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[](https://travis-ci.org/ethereum/ethash) |
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[](https://ci.appveyor.com/project/debris/ethash-nr37r/branch/master) |
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# Ethash |
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For details on this project, please see the Ethereum wiki: |
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https://github.com/ethereum/wiki/wiki/Ethash |
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### Coding Style for C++ code: |
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Follow the same exact style as in [cpp-ethereum](https://github.com/ethereum/cpp-ethereum/blob/develop/CodingStandards.txt) |
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### Coding Style for C code: |
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The main thing above all is code consistency. |
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- Tabs for indentation. A tab is 4 spaces |
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- Try to stick to the [K&R](http://en.wikipedia.org/wiki/Indent_style#K.26R_style), |
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especially for the C code. |
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- Keep the line lengths reasonable. No hard limit on 80 characters but don't go further |
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than 110. Some people work with multiple buffers next to each other. |
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Make them like you :) |
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@ -1,7 +0,0 @@ |
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# -*- mode: ruby -*- |
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# vi: set ft=ruby : |
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Vagrant.configure(2) do |config| |
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config.vm.box = "Ubuntu 12.04" |
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config.vm.box_url = "https://cloud-images.ubuntu.com/vagrant/precise/current/precise-server-cloudimg-amd64-vagrant-disk1.box" |
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end |
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@ -1,43 +0,0 @@ |
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version: 1.0.0.{build} |
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environment: |
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BOOST_ROOT: "c:/projects/ethash/deps/boost" |
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branches: |
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only: |
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- master |
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- develop |
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os: Windows Server 2012 R2 |
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clone_folder: c:\projects\ethash |
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#platform: Any CPU |
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#configuration: Debug |
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install: |
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# by default, all script lines are interpreted as batch |
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# scripts to run before build |
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before_build: |
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- echo "Downloading boost..." |
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- mkdir c:\projects\ethash\deps |
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- cd c:\projects\ethash\deps |
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- curl -O https://build.ethdev.com/builds/windows-precompiled/boost.tar.gz |
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- echo "Unzipping boost..." |
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- 7z x boost.tar.gz > nul |
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- 7z x boost.tar > nul |
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- ls |
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- echo "Running cmake..." |
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- cd c:\projects\ethash |
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- cmake . |
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build: |
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project: ALL_BUILD.vcxproj # path to Visual Studio solution or project |
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after_build: |
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- echo "Running tests..." |
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- cd c:\projects\ethash\test\c\Debug |
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- Test.exe |
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- echo "Finished!" |
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@ -1,440 +0,0 @@ |
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// Copyright 2015 The go-ethereum Authors
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// Copyright 2015 Lefteris Karapetsas <lefteris@refu.co>
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// Copyright 2015 Matthew Wampler-Doty <matthew.wampler.doty@gmail.com>
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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 ethash |
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/* |
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#include "src/libethash/internal.h" |
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int ethashGoCallback_cgo(unsigned); |
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*/ |
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import "C" |
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import ( |
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"errors" |
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"fmt" |
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"io/ioutil" |
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"math/big" |
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"math/rand" |
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"os" |
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"os/user" |
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"path/filepath" |
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"runtime" |
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"sync" |
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"sync/atomic" |
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"time" |
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"unsafe" |
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/crypto" |
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"github.com/ethereum/go-ethereum/log" |
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"github.com/ethereum/go-ethereum/pow" |
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) |
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var ( |
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maxUint256 = new(big.Int).Exp(big.NewInt(2), big.NewInt(256), big.NewInt(0)) |
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sharedLight = new(Light) |
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) |
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const ( |
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epochLength uint64 = 30000 |
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cacheSizeForTesting C.uint64_t = 1024 |
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dagSizeForTesting C.uint64_t = 1024 * 32 |
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) |
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var DefaultDir = defaultDir() |
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func defaultDir() string { |
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home := os.Getenv("HOME") |
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if user, err := user.Current(); err == nil { |
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home = user.HomeDir |
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} |
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if runtime.GOOS == "windows" { |
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return filepath.Join(home, "AppData", "Ethash") |
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} |
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return filepath.Join(home, ".ethash") |
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} |
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// cache wraps an ethash_light_t with some metadata
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// and automatic memory management.
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type cache struct { |
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epoch uint64 |
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used time.Time |
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test bool |
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gen sync.Once // ensures cache is only generated once.
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ptr *C.struct_ethash_light |
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} |
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// generate creates the actual cache. it can be called from multiple
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// goroutines. the first call will generate the cache, subsequent
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// calls wait until it is generated.
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func (cache *cache) generate() { |
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cache.gen.Do(func() { |
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started := time.Now() |
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seedHash := makeSeedHash(cache.epoch) |
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log.Debug(fmt.Sprintf("Generating cache for epoch %d (%x)", cache.epoch, seedHash)) |
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size := C.ethash_get_cachesize(C.uint64_t(cache.epoch * epochLength)) |
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if cache.test { |
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size = cacheSizeForTesting |
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} |
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cache.ptr = C.ethash_light_new_internal(size, (*C.ethash_h256_t)(unsafe.Pointer(&seedHash[0]))) |
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runtime.SetFinalizer(cache, freeCache) |
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log.Debug(fmt.Sprintf("Done generating cache for epoch %d, it took %v", cache.epoch, time.Since(started))) |
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}) |
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} |
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func freeCache(cache *cache) { |
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C.ethash_light_delete(cache.ptr) |
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cache.ptr = nil |
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} |
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func (cache *cache) compute(dagSize uint64, hash common.Hash, nonce uint64) (ok bool, mixDigest, result common.Hash) { |
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ret := C.ethash_light_compute_internal(cache.ptr, C.uint64_t(dagSize), hashToH256(hash), C.uint64_t(nonce)) |
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// Make sure cache is live until after the C call.
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// This is important because a GC might happen and execute
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// the finalizer before the call completes.
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_ = cache |
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return bool(ret.success), h256ToHash(ret.mix_hash), h256ToHash(ret.result) |
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} |
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// Light implements the Verify half of the proof of work. It uses a few small
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// in-memory caches to verify the nonces found by Full.
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type Light struct { |
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test bool // If set, use a smaller cache size
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mu sync.Mutex // Protects the per-epoch map of verification caches
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caches map[uint64]*cache // Currently maintained verification caches
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future *cache // Pre-generated cache for the estimated future DAG
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NumCaches int // Maximum number of caches to keep before eviction (only init, don't modify)
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} |
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// Verify checks whether the block's nonce is valid.
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func (l *Light) Verify(block pow.Block) bool { |
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// TODO: do ethash_quick_verify before getCache in order
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// to prevent DOS attacks.
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blockNum := block.NumberU64() |
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if blockNum >= epochLength*2048 { |
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log.Debug(fmt.Sprintf("block number %d too high, limit is %d", epochLength*2048)) |
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return false |
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} |
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difficulty := block.Difficulty() |
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/* Cannot happen if block header diff is validated prior to PoW, but can |
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happen if PoW is checked first due to parallel PoW checking. |
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We could check the minimum valid difficulty but for SoC we avoid (duplicating) |
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Ethereum protocol consensus rules here which are not in scope of Ethash |
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*/ |
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if difficulty.Cmp(common.Big0) == 0 { |
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log.Debug(fmt.Sprintf("invalid block difficulty")) |
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return false |
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} |
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cache := l.getCache(blockNum) |
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dagSize := C.ethash_get_datasize(C.uint64_t(blockNum)) |
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if l.test { |
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dagSize = dagSizeForTesting |
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} |
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// Recompute the hash using the cache.
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ok, mixDigest, result := cache.compute(uint64(dagSize), block.HashNoNonce(), block.Nonce()) |
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if !ok { |
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return false |
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} |
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// avoid mixdigest malleability as it's not included in a block's "hashNononce"
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if block.MixDigest() != mixDigest { |
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return false |
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} |
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// The actual check.
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target := new(big.Int).Div(maxUint256, difficulty) |
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return result.Big().Cmp(target) <= 0 |
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} |
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func h256ToHash(in C.ethash_h256_t) common.Hash { |
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return *(*common.Hash)(unsafe.Pointer(&in.b)) |
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} |
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func hashToH256(in common.Hash) C.ethash_h256_t { |
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return C.ethash_h256_t{b: *(*[32]C.uint8_t)(unsafe.Pointer(&in[0]))} |
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} |
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func (l *Light) getCache(blockNum uint64) *cache { |
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var c *cache |
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epoch := blockNum / epochLength |
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// If we have a PoW for that epoch, use that
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l.mu.Lock() |
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if l.caches == nil { |
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l.caches = make(map[uint64]*cache) |
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} |
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if l.NumCaches == 0 { |
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l.NumCaches = 3 |
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} |
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c = l.caches[epoch] |
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if c == nil { |
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// No cached DAG, evict the oldest if the cache limit was reached
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if len(l.caches) >= l.NumCaches { |
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var evict *cache |
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for _, cache := range l.caches { |
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if evict == nil || evict.used.After(cache.used) { |
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evict = cache |
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} |
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} |
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log.Debug(fmt.Sprintf("Evicting DAG for epoch %d in favour of epoch %d", evict.epoch, epoch)) |
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delete(l.caches, evict.epoch) |
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} |
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// If we have the new DAG pre-generated, use that, otherwise create a new one
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if l.future != nil && l.future.epoch == epoch { |
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log.Debug(fmt.Sprintf("Using pre-generated DAG for epoch %d", epoch)) |
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c, l.future = l.future, nil |
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} else { |
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log.Debug(fmt.Sprintf("No pre-generated DAG available, creating new for epoch %d", epoch)) |
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c = &cache{epoch: epoch, test: l.test} |
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} |
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l.caches[epoch] = c |
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// If we just used up the future cache, or need a refresh, regenerate
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if l.future == nil || l.future.epoch <= epoch { |
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log.Debug(fmt.Sprintf("Pre-generating DAG for epoch %d", epoch+1)) |
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l.future = &cache{epoch: epoch + 1, test: l.test} |
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go l.future.generate() |
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} |
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} |
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c.used = time.Now() |
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l.mu.Unlock() |
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// Wait for generation finish and return the cache
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c.generate() |
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return c |
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} |
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// dag wraps an ethash_full_t with some metadata
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// and automatic memory management.
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type dag struct { |
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epoch uint64 |
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test bool |
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dir string |
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gen sync.Once // ensures DAG is only generated once.
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ptr *C.struct_ethash_full |
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} |
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// generate creates the actual DAG. it can be called from multiple
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// goroutines. the first call will generate the DAG, subsequent
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// calls wait until it is generated.
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func (d *dag) generate() { |
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d.gen.Do(func() { |
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var ( |
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started = time.Now() |
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seedHash = makeSeedHash(d.epoch) |
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blockNum = C.uint64_t(d.epoch * epochLength) |
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cacheSize = C.ethash_get_cachesize(blockNum) |
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dagSize = C.ethash_get_datasize(blockNum) |
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) |
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if d.test { |
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cacheSize = cacheSizeForTesting |
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dagSize = dagSizeForTesting |
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} |
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if d.dir == "" { |
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d.dir = DefaultDir |
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} |
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log.Info(fmt.Sprintf("Generating DAG for epoch %d (size %d) (%x)", d.epoch, dagSize, seedHash)) |
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// Generate a temporary cache.
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// TODO: this could share the cache with Light
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cache := C.ethash_light_new_internal(cacheSize, (*C.ethash_h256_t)(unsafe.Pointer(&seedHash[0]))) |
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defer C.ethash_light_delete(cache) |
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// Generate the actual DAG.
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d.ptr = C.ethash_full_new_internal( |
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C.CString(d.dir), |
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hashToH256(seedHash), |
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dagSize, |
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cache, |
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(C.ethash_callback_t)(unsafe.Pointer(C.ethashGoCallback_cgo)), |
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) |
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if d.ptr == nil { |
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panic("ethash_full_new IO or memory error") |
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} |
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runtime.SetFinalizer(d, freeDAG) |
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log.Info(fmt.Sprintf("Done generating DAG for epoch %d, it took %v", d.epoch, time.Since(started))) |
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}) |
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} |
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func freeDAG(d *dag) { |
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C.ethash_full_delete(d.ptr) |
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d.ptr = nil |
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} |
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func (d *dag) Ptr() unsafe.Pointer { |
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return unsafe.Pointer(d.ptr.data) |
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} |
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//export ethashGoCallback
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func ethashGoCallback(percent C.unsigned) C.int { |
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log.Info(fmt.Sprintf("Generating DAG: %d%%", percent)) |
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return 0 |
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} |
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// MakeDAG pre-generates a DAG file for the given block number in the
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// given directory. If dir is the empty string, the default directory
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// is used.
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func MakeDAG(blockNum uint64, dir string) error { |
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d := &dag{epoch: blockNum / epochLength, dir: dir} |
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if blockNum >= epochLength*2048 { |
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return fmt.Errorf("block number too high, limit is %d", epochLength*2048) |
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} |
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d.generate() |
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if d.ptr == nil { |
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return errors.New("failed") |
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} |
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return nil |
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} |
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// Full implements the Search half of the proof of work.
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type Full struct { |
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Dir string // use this to specify a non-default DAG directory
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test bool // if set use a smaller DAG size
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turbo bool |
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hashRate int32 |
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mu sync.Mutex // protects dag
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current *dag // current full DAG
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} |
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func (pow *Full) getDAG(blockNum uint64) (d *dag) { |
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epoch := blockNum / epochLength |
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pow.mu.Lock() |
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if pow.current != nil && pow.current.epoch == epoch { |
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d = pow.current |
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} else { |
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d = &dag{epoch: epoch, test: pow.test, dir: pow.Dir} |
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pow.current = d |
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} |
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pow.mu.Unlock() |
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// wait for it to finish generating.
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d.generate() |
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return d |
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} |
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func (pow *Full) Search(block pow.Block, stop <-chan struct{}, index int) (nonce uint64, mixDigest []byte) { |
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dag := pow.getDAG(block.NumberU64()) |
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r := rand.New(rand.NewSource(time.Now().UnixNano())) |
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diff := block.Difficulty() |
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i := int64(0) |
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starti := i |
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start := time.Now().UnixNano() |
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previousHashrate := int32(0) |
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nonce = uint64(r.Int63()) |
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hash := hashToH256(block.HashNoNonce()) |
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target := new(big.Int).Div(maxUint256, diff) |
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for { |
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select { |
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case <-stop: |
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atomic.AddInt32(&pow.hashRate, -previousHashrate) |
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return 0, nil |
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default: |
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i++ |
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// we don't have to update hash rate on every nonce, so update after
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// first nonce check and then after 2^X nonces
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if i == 2 || ((i % (1 << 16)) == 0) { |
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elapsed := time.Now().UnixNano() - start |
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hashes := (float64(1e9) / float64(elapsed)) * float64(i-starti) |
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hashrateDiff := int32(hashes) - previousHashrate |
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previousHashrate = int32(hashes) |
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atomic.AddInt32(&pow.hashRate, hashrateDiff) |
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} |
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ret := C.ethash_full_compute(dag.ptr, hash, C.uint64_t(nonce)) |
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result := h256ToHash(ret.result).Big() |
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// TODO: disagrees with the spec https://github.com/ethereum/wiki/wiki/Ethash#mining
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if ret.success && result.Cmp(target) <= 0 { |
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mixDigest = C.GoBytes(unsafe.Pointer(&ret.mix_hash), C.int(32)) |
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atomic.AddInt32(&pow.hashRate, -previousHashrate) |
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return nonce, mixDigest |
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} |
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nonce += 1 |
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} |
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if !pow.turbo { |
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time.Sleep(20 * time.Microsecond) |
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} |
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} |
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} |
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func (pow *Full) GetHashrate() int64 { |
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return int64(atomic.LoadInt32(&pow.hashRate)) |
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} |
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func (pow *Full) Turbo(on bool) { |
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// TODO: this needs to use an atomic operation.
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pow.turbo = on |
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} |
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// Ethash combines block verification with Light and
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// nonce searching with Full into a single proof of work.
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type Ethash struct { |
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*Light |
||||
*Full |
||||
} |
||||
|
||||
// New creates an instance of the proof of work.
|
||||
func New() *Ethash { |
||||
return &Ethash{new(Light), &Full{turbo: true}} |
||||
} |
||||
|
||||
// NewShared creates an instance of the proof of work., where a single instance
|
||||
// of the Light cache is shared across all instances created with NewShared.
|
||||
func NewShared() *Ethash { |
||||
return &Ethash{sharedLight, &Full{turbo: true}} |
||||
} |
||||
|
||||
// NewForTesting creates a proof of work for use in unit tests.
|
||||
// It uses a smaller DAG and cache size to keep test times low.
|
||||
// DAG files are stored in a temporary directory.
|
||||
//
|
||||
// Nonces found by a testing instance are not verifiable with a
|
||||
// regular-size cache.
|
||||
func NewForTesting() (*Ethash, error) { |
||||
dir, err := ioutil.TempDir("", "ethash-test") |
||||
if err != nil { |
||||
return nil, err |
||||
} |
||||
return &Ethash{&Light{test: true}, &Full{Dir: dir, test: true}}, nil |
||||
} |
||||
|
||||
func GetSeedHash(blockNum uint64) ([]byte, error) { |
||||
if blockNum >= epochLength*2048 { |
||||
return nil, fmt.Errorf("block number too high, limit is %d", epochLength*2048) |
||||
} |
||||
sh := makeSeedHash(blockNum / epochLength) |
||||
return sh[:], nil |
||||
} |
||||
|
||||
func makeSeedHash(epoch uint64) (sh common.Hash) { |
||||
for ; epoch > 0; epoch-- { |
||||
sh = crypto.Sha3Hash(sh[:]) |
||||
} |
||||
return sh |
||||
} |
||||
@ -1,51 +0,0 @@ |
||||
// Copyright 2015 The go-ethereum Authors
|
||||
// This file is part of the go-ethereum library.
|
||||
//
|
||||
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// The go-ethereum library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
package ethash |
||||
|
||||
/* |
||||
-mno-stack-arg-probe disables stack probing which avoids the function |
||||
__chkstk_ms being linked. this avoids a clash of this symbol as we also |
||||
separately link the secp256k1 lib which ends up defining this symbol |
||||
|
||||
1. https://gcc.gnu.org/onlinedocs/gccint/Stack-Checking.html
|
||||
2. https://groups.google.com/forum/#!msg/golang-dev/v1bziURSQ4k/88fXuJ24e-gJ
|
||||
3. https://groups.google.com/forum/#!topic/golang-nuts/VNP6Mwz_B6o
|
||||
|
||||
*/ |
||||
|
||||
/* |
||||
#cgo CFLAGS: -std=gnu99 -Wall |
||||
#cgo windows CFLAGS: -mno-stack-arg-probe |
||||
#cgo LDFLAGS: -lm |
||||
|
||||
#include "src/libethash/internal.c" |
||||
#include "src/libethash/sha3.c" |
||||
#include "src/libethash/io.c" |
||||
|
||||
#ifdef _WIN32 |
||||
# include "src/libethash/io_win32.c" |
||||
# include "src/libethash/mmap_win32.c" |
||||
#else |
||||
# include "src/libethash/io_posix.c" |
||||
#endif |
||||
|
||||
// 'gateway function' for calling back into go.
|
||||
extern int ethashGoCallback(unsigned); |
||||
int ethashGoCallback_cgo(unsigned percent) { return ethashGoCallback(percent); } |
||||
|
||||
*/ |
||||
import "C" |
||||
@ -1,47 +0,0 @@ |
||||
#!/usr/bin/env python |
||||
import os |
||||
from distutils.core import setup, Extension |
||||
sources = [ |
||||
'src/python/core.c', |
||||
'src/libethash/io.c', |
||||
'src/libethash/internal.c', |
||||
'src/libethash/sha3.c'] |
||||
if os.name == 'nt': |
||||
sources += [ |
||||
'src/libethash/util_win32.c', |
||||
'src/libethash/io_win32.c', |
||||
'src/libethash/mmap_win32.c', |
||||
] |
||||
else: |
||||
sources += [ |
||||
'src/libethash/io_posix.c' |
||||
] |
||||
depends = [ |
||||
'src/libethash/ethash.h', |
||||
'src/libethash/compiler.h', |
||||
'src/libethash/data_sizes.h', |
||||
'src/libethash/endian.h', |
||||
'src/libethash/ethash.h', |
||||
'src/libethash/io.h', |
||||
'src/libethash/fnv.h', |
||||
'src/libethash/internal.h', |
||||
'src/libethash/sha3.h', |
||||
'src/libethash/util.h', |
||||
] |
||||
pyethash = Extension('pyethash', |
||||
sources=sources, |
||||
depends=depends, |
||||
extra_compile_args=["-Isrc/", "-std=gnu99", "-Wall"]) |
||||
|
||||
setup( |
||||
name='pyethash', |
||||
author="Matthew Wampler-Doty", |
||||
author_email="matthew.wampler.doty@gmail.com", |
||||
license='GPL', |
||||
version='0.1.23', |
||||
url='https://github.com/ethereum/ethash', |
||||
download_url='https://github.com/ethereum/ethash/tarball/v23', |
||||
description=('Python wrappers for ethash, the ethereum proof of work' |
||||
'hashing function'), |
||||
ext_modules=[pyethash], |
||||
) |
||||
Loading…
Reference in new issue