/
chainmonitor.go
235 lines (206 loc) · 6.53 KB
/
chainmonitor.go
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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
// Copyright (c) 2018, The Decred developers
// Copyright (c) 2017, Jonathan Chappelow
// See LICENSE for details.
package blockdata
import (
"context"
"fmt"
"reflect"
"sync"
"github.com/decred/dcrd/chaincfg/chainhash"
"github.com/decred/dcrd/dcrutil"
"github.com/decred/dcrd/wire"
"github.com/decred/dcrdata/v3/txhelpers"
)
// for getblock, ticketfeeinfo, estimatestakediff, etc.
type chainMonitor struct {
ctx context.Context
collector *Collector
dataSavers []BlockDataSaver
reorgDataSavers []BlockDataSaver
wg *sync.WaitGroup
watchaddrs map[string]txhelpers.TxAction
blockChan chan *chainhash.Hash
recvTxBlockChan chan *txhelpers.BlockWatchedTx
reorgChan chan *txhelpers.ReorgData
ConnectingLock chan struct{}
DoneConnecting chan struct{}
syncConnect sync.Mutex
reorgLock sync.Mutex
}
// NewChainMonitor creates a new chainMonitor.
func NewChainMonitor(ctx context.Context, collector *Collector, savers []BlockDataSaver,
reorgSavers []BlockDataSaver, wg *sync.WaitGroup, addrs map[string]txhelpers.TxAction,
blockChan chan *chainhash.Hash, recvTxBlockChan chan *txhelpers.BlockWatchedTx,
reorgChan chan *txhelpers.ReorgData) *chainMonitor {
return &chainMonitor{
ctx: ctx,
collector: collector,
dataSavers: savers,
reorgDataSavers: reorgSavers,
wg: wg,
watchaddrs: addrs,
blockChan: blockChan,
recvTxBlockChan: recvTxBlockChan,
reorgChan: reorgChan,
ConnectingLock: make(chan struct{}, 1),
DoneConnecting: make(chan struct{}),
}
}
// BlockConnectedSync is the synchronous (blocking call) handler for the newly
// connected block given by the hash.
func (p *chainMonitor) BlockConnectedSync(hash *chainhash.Hash) {
// Connections go one at a time so signals cannot be mixed
p.syncConnect.Lock()
defer p.syncConnect.Unlock()
// lock with buffered channel
p.ConnectingLock <- struct{}{}
p.blockChan <- hash
// wait
<-p.DoneConnecting
}
func (p *chainMonitor) collect(hash *chainhash.Hash) (*wire.MsgBlock, *BlockData, error) {
// getblock RPC
msgBlock, err := p.collector.dcrdChainSvr.GetBlock(hash)
if err != nil {
return nil, nil, fmt.Errorf("failed to get block %v: %v", hash, err)
}
block := dcrutil.NewBlock(msgBlock)
height := block.Height()
log.Infof("Block height %v connected. Collecting data...", height)
if len(p.watchaddrs) > 0 {
// txsForOutpoints := blockConsumesOutpointWithAddresses(block, p.watchaddrs,
// p.collector.dcrdChainSvr)
// if len(txsForOutpoints) > 0 {
// p.spendTxBlockChan <- &BlockWatchedTx{height, txsForOutpoints}
// }
txsForAddrs := txhelpers.BlockReceivesToAddresses(block,
p.watchaddrs, p.collector.netParams)
if len(txsForAddrs) > 0 {
p.recvTxBlockChan <- &txhelpers.BlockWatchedTx{
BlockHeight: height,
TxsForAddress: txsForAddrs}
}
}
// Get node's best block height to see if the block for which we are
// collecting data is the best block.
chainHeight, err := p.collector.dcrdChainSvr.GetBlockCount()
if err != nil {
return nil, nil, fmt.Errorf("failed to get chain height: %v", err)
}
// If new block height not equal to chain height, then we are behind
// on data collection, so specify the hash of the notified, skipping
// stake diff estimates and other stuff for web ui that is only
// relevant for the best block.
var blockData *BlockData
if chainHeight != height {
log.Debugf("Collecting data for block %v (%d), behind tip %d.",
hash, height, chainHeight)
blockData, _, err = p.collector.CollectHash(hash)
if err != nil {
return nil, nil, fmt.Errorf("blockdata.CollectHash(hash) failed: %v", err.Error())
}
} else {
blockData, _, err = p.collector.Collect()
if err != nil {
return nil, nil, fmt.Errorf("blockdata.Collect() failed: %v", err.Error())
}
}
return msgBlock, blockData, nil
}
// blockConnectedHandler handles block connected notifications, which trigger
// data collection and storage.
func (p *chainMonitor) BlockConnectedHandler() {
defer p.wg.Done()
out:
for {
keepon:
select {
case hash, ok := <-p.blockChan:
// Do not handle reorg and block connects simultaneously.
p.reorgLock.Lock()
release := func() { p.reorgLock.Unlock() }
select {
case <-p.ConnectingLock:
// send on unbuffered channel
release = func() { p.reorgLock.Unlock(); p.DoneConnecting <- struct{}{} }
default:
}
if !ok {
log.Warnf("Block connected channel closed.")
release()
break out
}
// Collect block data.
msgBlock, blockData, err := p.collect(hash)
if err != nil {
log.Errorf("Failed to collect data for block %v: %v", hash, err)
release()
break keepon
}
// Store block data with each saver.
for _, s := range p.dataSavers {
if s != nil {
// Save data to wherever the saver wants to put it.
if err = s.Store(blockData, msgBlock); err != nil {
log.Errorf("(%v).Store failed: %v", reflect.TypeOf(s), err)
}
}
}
release()
case <-p.ctx.Done():
log.Debugf("Got quit signal. Exiting block connected handler.")
break out
}
}
}
// ReorgHandler receives notification of a chain reorganization. A reorg is
// handled in blockdata by simply collecting data for the new best block, and
// storing it in the *reorgDataSavers*.
func (p *chainMonitor) ReorgHandler() {
defer p.wg.Done()
out:
for {
keepon:
select {
case reorgData, ok := <-p.reorgChan:
if !ok {
log.Warnf("Reorg channel closed.")
break out
}
if reorgData == nil {
log.Warnf("nil reorg data received!")
break keepon
}
newHeight := reorgData.NewChainHeight
newHash := reorgData.NewChainHead
// Do not handle reorg and block connects simultaneously.
p.reorgLock.Lock()
log.Infof("Reorganize signaled to blockdata. "+
"Collecting data for NEW head block %v at height %d.",
newHash, newHeight)
// Collect data for the new best block.
msgBlock, blockData, err := p.collect(&newHash)
if err != nil {
log.Errorf("ReorgHandler: Failed to collect data for block %v: %v", newHash, err)
p.reorgLock.Unlock()
reorgData.WG.Done()
break keepon
}
// Store block data with each REORG saver.
for _, s := range p.reorgDataSavers {
if s != nil {
// Save data to wherever the saver wants to put it.
if err := s.Store(blockData, msgBlock); err != nil {
log.Errorf("(%v).Store failed: %v", reflect.TypeOf(s), err)
}
}
}
p.reorgLock.Unlock()
reorgData.WG.Done()
case <-p.ctx.Done():
log.Debugf("Got quit signal. Exiting reorg notification handler.")
break out
}
}
}