137 lines
4.8 KiB
Go
137 lines
4.8 KiB
Go
// Copyright 2016 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 miner
|
|
|
|
import (
|
|
"container/ring"
|
|
"sync"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
"github.com/ethereum/go-ethereum/log"
|
|
)
|
|
|
|
// chainRetriever is used by the unconfirmed block set to verify whether a previously
|
|
// mined block is part of the canonical chain or not.
|
|
type chainRetriever interface {
|
|
// GetHeaderByNumber retrieves the canonical header associated with a block number.
|
|
GetHeaderByNumber(number uint64) *types.Header
|
|
|
|
// GetBlockByNumber retrieves the canonical block associated with a block number.
|
|
GetBlockByNumber(number uint64) *types.Block
|
|
}
|
|
|
|
// unconfirmedBlock is a small collection of metadata about a locally mined block
|
|
// that is placed into a unconfirmed set for canonical chain inclusion tracking.
|
|
type unconfirmedBlock struct {
|
|
index uint64
|
|
hash common.Hash
|
|
}
|
|
|
|
// unconfirmedBlocks implements a data structure to maintain locally mined blocks
|
|
// have not yet reached enough maturity to guarantee chain inclusion. It is
|
|
// used by the miner to provide logs to the user when a previously mined block
|
|
// has a high enough guarantee to not be reorged out of the canonical chain.
|
|
type unconfirmedBlocks struct {
|
|
chain chainRetriever // Blockchain to verify canonical status through
|
|
depth uint // Depth after which to discard previous blocks
|
|
blocks *ring.Ring // Block infos to allow canonical chain cross checks
|
|
lock sync.Mutex // Protects the fields from concurrent access
|
|
}
|
|
|
|
// newUnconfirmedBlocks returns new data structure to track currently unconfirmed blocks.
|
|
func newUnconfirmedBlocks(chain chainRetriever, depth uint) *unconfirmedBlocks {
|
|
return &unconfirmedBlocks{
|
|
chain: chain,
|
|
depth: depth,
|
|
}
|
|
}
|
|
|
|
// Insert adds a new block to the set of unconfirmed ones.
|
|
func (set *unconfirmedBlocks) Insert(index uint64, hash common.Hash) {
|
|
// If a new block was mined locally, shift out any old enough blocks
|
|
set.Shift(index)
|
|
|
|
// Create the new item as its own ring
|
|
item := ring.New(1)
|
|
item.Value = &unconfirmedBlock{
|
|
index: index,
|
|
hash: hash,
|
|
}
|
|
// Set as the initial ring or append to the end
|
|
set.lock.Lock()
|
|
defer set.lock.Unlock()
|
|
|
|
if set.blocks == nil {
|
|
set.blocks = item
|
|
} else {
|
|
set.blocks.Move(-1).Link(item)
|
|
}
|
|
// Display a log for the user to notify of a new mined block unconfirmed
|
|
log.Info("🔨 mined potential block", "number", index, "hash", hash)
|
|
}
|
|
|
|
// Shift drops all unconfirmed blocks from the set which exceed the unconfirmed sets depth
|
|
// allowance, checking them against the canonical chain for inclusion or staleness
|
|
// report.
|
|
func (set *unconfirmedBlocks) Shift(height uint64) {
|
|
set.lock.Lock()
|
|
defer set.lock.Unlock()
|
|
|
|
for set.blocks != nil {
|
|
// Retrieve the next unconfirmed block and abort if too fresh
|
|
next := set.blocks.Value.(*unconfirmedBlock)
|
|
if next.index+uint64(set.depth) > height {
|
|
break
|
|
}
|
|
// Block seems to exceed depth allowance, check for canonical status
|
|
header := set.chain.GetHeaderByNumber(next.index)
|
|
switch {
|
|
case header == nil:
|
|
log.Warn("Failed to retrieve header of mined block", "number", next.index, "hash", next.hash)
|
|
case header.Hash() == next.hash:
|
|
log.Info("🔗 block reached canonical chain", "number", next.index, "hash", next.hash)
|
|
default:
|
|
// Block is not canonical, check whether we have an uncle or a lost block
|
|
included := false
|
|
for number := next.index; !included && number < next.index+uint64(set.depth) && number <= height; number++ {
|
|
if block := set.chain.GetBlockByNumber(number); block != nil {
|
|
for _, uncle := range block.Uncles() {
|
|
if uncle.Hash() == next.hash {
|
|
included = true
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if included {
|
|
log.Info("⑂ block became an uncle", "number", next.index, "hash", next.hash)
|
|
} else {
|
|
log.Info("😱 block lost", "number", next.index, "hash", next.hash)
|
|
}
|
|
}
|
|
// Drop the block out of the ring
|
|
if set.blocks.Value == set.blocks.Next().Value {
|
|
set.blocks = nil
|
|
} else {
|
|
set.blocks = set.blocks.Move(-1)
|
|
set.blocks.Unlink(1)
|
|
set.blocks = set.blocks.Move(1)
|
|
}
|
|
}
|
|
}
|