core, consensus: pluggable consensus engines (#3817)

This commit adds pluggable consensus engines to go-ethereum. In short, it
introduces a generic consensus interface, and refactors the entire codebase to
use this interface.

1 files changed, 0 insertions, 58 deletions

diff --git a/pow/pow.go b/pow/pow.go
deleted file mode 100644
index 4849adb3e..000000000
--- a/pow/pow.go
+++ /dev/null
@@ -1,58 +0,0 @@
-// Copyright 2014 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 pow
-
-import (
-	"math/big"
-
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
-)
-
-type Block interface {
-	Difficulty() *big.Int
-	HashNoNonce() common.Hash
-	Nonce() uint64
-	MixDigest() common.Hash
-	NumberU64() uint64
-}
-
-type ChainManager interface {
-	GetBlockByNumber(uint64) *types.Block
-	CurrentBlock() *types.Block
-}
-
-type PoW interface {
-	Verify(block Block) error
-	Search(block Block, stop <-chan struct{}) (uint64, []byte)
-	Hashrate() float64
-}
-
-// FakePow is a non-validating proof of work implementation.
-// It returns true from Verify for any block.
-type FakePow struct{}
-
-// Verify implements PoW, returning a success for an input.
-func (pow FakePow) Verify(block Block) error { return nil }
-
-// Search implements PoW, returning the nonce 0 for any call.
-func (pow FakePow) Search(block Block, stop <-chan struct{}) (uint64, []byte) {
-	return 0, nil
-}
-
-// Hashrate implements PoW, returning 0.
-func (pow FakePow) Hashrate() float64 { return 0 }