1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
// 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"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
)
// pendingBlock is a small collection of metadata about a locally mined block
// that is placed into a pending set for canonical chain inclusion tracking.
type pendingBlock struct {
index uint64
hash common.Hash
}
// pendingBlockSet implements a data structure to maintain locally mined blocks
// have 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 te canonical chain.
type pendingBlockSet struct {
chain *core.BlockChain // 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.RWMutex // Protects the fields from concurrent access
}
// newPendingBlockSet returns new data structure to track currently pending blocks.
func newPendingBlockSet(chain *core.BlockChain, depth uint) *pendingBlockSet {
return &pendingBlockSet{
chain: chain,
depth: depth,
}
}
// Insert adds a new block to the set of pending ones.
func (set *pendingBlockSet) 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 = &pendingBlock{
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 pending
glog.V(logger.Info).Infof("🔨 mined potential block #%d [%x…], waiting for %d blocks to confirm", index, hash.Bytes()[:4], set.depth)
}
// Shift drops all pending blocks from the set which exceed the pending sets depth
// allowance, checking them against the canonical chain for inclusion or staleness
// report.
func (set *pendingBlockSet) Shift(height uint64) {
set.lock.Lock()
defer set.lock.Unlock()
// Short circuit if there are no pending blocks to shift
if set.blocks == nil {
return
}
// Otherwise shift all blocks below the depth allowance
for set.blocks != nil {
// Retrieve the next pending block and abort if too fresh
next := set.blocks.Value.(*pendingBlock)
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:
glog.V(logger.Warn).Infof("failed to retrieve header of mined block #%d [%x…]", next.index, next.hash.Bytes()[:4])
case header.Hash() == next.hash:
glog.V(logger.Info).Infof("🔗 mined block #%d [%x…] reached canonical chain", next.index, next.hash.Bytes()[:4])
default:
glog.V(logger.Info).Infof("⑂ mined block #%d [%x…] became a side fork", next.index, next.hash.Bytes()[:4])
}
// 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)
}
}
}
|
