119 lines
4.3 KiB
Go
119 lines
4.3 KiB
Go
// Copyright 2016 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 miner
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import (
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"container/ring"
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"sync"
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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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)
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// headerRetriever is used by the unconfirmed block set to verify whether a previously
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// mined block is part of the canonical chain or not.
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type headerRetriever interface {
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// GetHeaderByNumber retrieves the canonical header associated with a block number.
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GetHeaderByNumber(number uint64) *types.Header
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}
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// unconfirmedBlock is a small collection of metadata about a locally mined block
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// that is placed into a unconfirmed set for canonical chain inclusion tracking.
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type unconfirmedBlock struct {
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index uint64
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hash common.Hash
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}
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// unconfirmedBlocks implements a data structure to maintain locally mined blocks
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// have have not yet reached enough maturity to guarantee chain inclusion. It is
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// used by the miner to provide logs to the user when a previously mined block
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// has a high enough guarantee to not be reorged out of te canonical chain.
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type unconfirmedBlocks struct {
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chain headerRetriever // Blockchain to verify canonical status through
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depth uint // Depth after which to discard previous blocks
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blocks *ring.Ring // Block infos to allow canonical chain cross checks
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lock sync.RWMutex // Protects the fields from concurrent access
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}
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// newUnconfirmedBlocks returns new data structure to track currently unconfirmed blocks.
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func newUnconfirmedBlocks(chain headerRetriever, depth uint) *unconfirmedBlocks {
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return &unconfirmedBlocks{
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chain: chain,
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depth: depth,
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}
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}
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// Insert adds a new block to the set of unconfirmed ones.
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func (set *unconfirmedBlocks) Insert(index uint64, hash common.Hash) {
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// If a new block was mined locally, shift out any old enough blocks
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set.Shift(index)
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// Create the new item as its own ring
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item := ring.New(1)
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item.Value = &unconfirmedBlock{
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index: index,
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hash: hash,
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}
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// Set as the initial ring or append to the end
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set.lock.Lock()
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defer set.lock.Unlock()
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if set.blocks == nil {
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set.blocks = item
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} else {
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set.blocks.Move(-1).Link(item)
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}
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// Display a log for the user to notify of a new mined block unconfirmed
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glog.V(logger.Info).Infof("🔨 mined potential block #%d [%x…], waiting for %d blocks to confirm", index, hash.Bytes()[:4], set.depth)
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}
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// Shift drops all unconfirmed blocks from the set which exceed the unconfirmed sets depth
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// allowance, checking them against the canonical chain for inclusion or staleness
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// report.
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func (set *unconfirmedBlocks) Shift(height uint64) {
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set.lock.Lock()
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defer set.lock.Unlock()
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for set.blocks != nil {
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// Retrieve the next unconfirmed block and abort if too fresh
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next := set.blocks.Value.(*unconfirmedBlock)
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if next.index+uint64(set.depth) > height {
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break
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}
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// Block seems to exceed depth allowance, check for canonical status
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header := set.chain.GetHeaderByNumber(next.index)
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switch {
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case header == nil:
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glog.V(logger.Warn).Infof("failed to retrieve header of mined block #%d [%x…]", next.index, next.hash.Bytes()[:4])
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case header.Hash() == next.hash:
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glog.V(logger.Info).Infof("🔗 mined block #%d [%x…] reached canonical chain", next.index, next.hash.Bytes()[:4])
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default:
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glog.V(logger.Info).Infof("⑂ mined block #%d [%x…] became a side fork", next.index, next.hash.Bytes()[:4])
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}
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// Drop the block out of the ring
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if set.blocks.Value == set.blocks.Next().Value {
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set.blocks = nil
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} else {
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set.blocks = set.blocks.Move(-1)
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set.blocks.Unlink(1)
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set.blocks = set.blocks.Move(1)
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}
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}
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}
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