aboutsummaryrefslogtreecommitdiffstats
path: root/les/server.go
blob: bc5dd0837a0717d5c66d71ea963c2d1b5588750e (plain) (blame)
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
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
// Copyright 2015 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 les implements the Light Ethereum Subprotocol.
package les

import (
    "encoding/binary"
    "fmt"
    "math"
    "sync"
    "time"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/eth"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/les/flowcontrol"
    "github.com/ethereum/go-ethereum/light"
    "github.com/ethereum/go-ethereum/p2p"
    "github.com/ethereum/go-ethereum/rlp"
    "github.com/ethereum/go-ethereum/trie"
)

type LesServer struct {
    protocolManager *ProtocolManager
    fcManager       *flowcontrol.ClientManager // nil if our node is client only
    fcCostStats     *requestCostStats
    defParams       *flowcontrol.ServerParams
}

func NewLesServer(eth *eth.Ethereum, config *eth.Config) (*LesServer, error) {
    pm, err := NewProtocolManager(config.ChainConfig, false, config.NetworkId, eth.EventMux(), eth.Pow(), eth.BlockChain(), eth.TxPool(), eth.ChainDb(), nil, nil)
    if err != nil {
        return nil, err
    }
    pm.blockLoop()

    srv := &LesServer{protocolManager: pm}
    pm.server = srv

    srv.defParams = &flowcontrol.ServerParams{
        BufLimit:    300000000,
        MinRecharge: 50000,
    }
    srv.fcManager = flowcontrol.NewClientManager(uint64(config.LightServ), 10, 1000000000)
    srv.fcCostStats = newCostStats(eth.ChainDb())
    return srv, nil
}

func (s *LesServer) Protocols() []p2p.Protocol {
    return s.protocolManager.SubProtocols
}

func (s *LesServer) Start() {
    s.protocolManager.Start()
}

func (s *LesServer) Stop() {
    s.fcCostStats.store()
    s.fcManager.Stop()
    go func() {
        <-s.protocolManager.noMorePeers
    }()
    s.protocolManager.Stop()
}

type requestCosts struct {
    baseCost, reqCost uint64
}

type requestCostTable map[uint64]*requestCosts

type RequestCostList []struct {
    MsgCode, BaseCost, ReqCost uint64
}

func (list RequestCostList) decode() requestCostTable {
    table := make(requestCostTable)
    for _, e := range list {
        table[e.MsgCode] = &requestCosts{
            baseCost: e.BaseCost,
            reqCost:  e.ReqCost,
        }
    }
    return table
}

func (table requestCostTable) encode() RequestCostList {
    list := make(RequestCostList, len(table))
    for idx, code := range reqList {
        list[idx].MsgCode = code
        list[idx].BaseCost = table[code].baseCost
        list[idx].ReqCost = table[code].reqCost
    }
    return list
}

type linReg struct {
    sumX, sumY, sumXX, sumXY float64
    cnt                      uint64
}

const linRegMaxCnt = 100000

func (l *linReg) add(x, y float64) {
    if l.cnt >= linRegMaxCnt {
        sub := float64(l.cnt+1-linRegMaxCnt) / linRegMaxCnt
        l.sumX -= l.sumX * sub
        l.sumY -= l.sumY * sub
        l.sumXX -= l.sumXX * sub
        l.sumXY -= l.sumXY * sub
        l.cnt = linRegMaxCnt - 1
    }
    l.cnt++
    l.sumX += x
    l.sumY += y
    l.sumXX += x * x
    l.sumXY += x * y
}

func (l *linReg) calc() (b, m float64) {
    if l.cnt == 0 {
        return 0, 0
    }
    cnt := float64(l.cnt)
    d := cnt*l.sumXX - l.sumX*l.sumX
    if d < 0.001 {
        return l.sumY / cnt, 0
    }
    m = (cnt*l.sumXY - l.sumX*l.sumY) / d
    b = (l.sumY / cnt) - (m * l.sumX / cnt)
    return b, m
}

func (l *linReg) toBytes() []byte {
    var arr [40]byte
    binary.BigEndian.PutUint64(arr[0:8], math.Float64bits(l.sumX))
    binary.BigEndian.PutUint64(arr[8:16], math.Float64bits(l.sumY))
    binary.BigEndian.PutUint64(arr[16:24], math.Float64bits(l.sumXX))
    binary.BigEndian.PutUint64(arr[24:32], math.Float64bits(l.sumXY))
    binary.BigEndian.PutUint64(arr[32:40], l.cnt)
    return arr[:]
}

func linRegFromBytes(data []byte) *linReg {
    if len(data) != 40 {
        return nil
    }
    l := &linReg{}
    l.sumX = math.Float64frombits(binary.BigEndian.Uint64(data[0:8]))
    l.sumY = math.Float64frombits(binary.BigEndian.Uint64(data[8:16]))
    l.sumXX = math.Float64frombits(binary.BigEndian.Uint64(data[16:24]))
    l.sumXY = math.Float64frombits(binary.BigEndian.Uint64(data[24:32]))
    l.cnt = binary.BigEndian.Uint64(data[32:40])
    return l
}

type requestCostStats struct {
    lock  sync.RWMutex
    db    ethdb.Database
    stats map[uint64]*linReg
}

type requestCostStatsRlp []struct {
    MsgCode uint64
    Data    []byte
}

var rcStatsKey = []byte("_requestCostStats")

func newCostStats(db ethdb.Database) *requestCostStats {
    stats := make(map[uint64]*linReg)
    for _, code := range reqList {
        stats[code] = &linReg{cnt: 100}
    }

    if db != nil {
        data, err := db.Get(rcStatsKey)
        var statsRlp requestCostStatsRlp
        if err == nil {
            err = rlp.DecodeBytes(data, &statsRlp)
        }
        if err == nil {
            for _, r := range statsRlp {
                if stats[r.MsgCode] != nil {
                    if l := linRegFromBytes(r.Data); l != nil {
                        stats[r.MsgCode] = l
                    }
                }
            }
        }
    }

    return &requestCostStats{
        db:    db,
        stats: stats,
    }
}

func (s *requestCostStats) store() {
    s.lock.Lock()
    defer s.lock.Unlock()

    statsRlp := make(requestCostStatsRlp, len(reqList))
    for i, code := range reqList {
        statsRlp[i].MsgCode = code
        statsRlp[i].Data = s.stats[code].toBytes()
    }

    if data, err := rlp.EncodeToBytes(statsRlp); err == nil {
        s.db.Put(rcStatsKey, data)
    }
}

func (s *requestCostStats) getCurrentList() RequestCostList {
    s.lock.Lock()
    defer s.lock.Unlock()

    list := make(RequestCostList, len(reqList))
    //fmt.Println("RequestCostList")
    for idx, code := range reqList {
        b, m := s.stats[code].calc()
        //fmt.Println(code, s.stats[code].cnt, b/1000000, m/1000000)
        if m < 0 {
            b += m
            m = 0
        }
        if b < 0 {
            b = 0
        }

        list[idx].MsgCode = code
        list[idx].BaseCost = uint64(b * 2)
        list[idx].ReqCost = uint64(m * 2)
    }
    return list
}

func (s *requestCostStats) update(msgCode, reqCnt, cost uint64) {
    s.lock.Lock()
    defer s.lock.Unlock()

    c, ok := s.stats[msgCode]
    if !ok || reqCnt == 0 {
        return
    }
    c.add(float64(reqCnt), float64(cost))
}

func (pm *ProtocolManager) blockLoop() {
    pm.wg.Add(1)
    sub := pm.eventMux.Subscribe(core.ChainHeadEvent{})
    newCht := make(chan struct{}, 10)
    newCht <- struct{}{}
    go func() {
        var mu sync.Mutex
        var lastHead *types.Header
        lastBroadcastTd := common.Big0
        for {
            select {
            case ev := <-sub.Chan():
                peers := pm.peers.AllPeers()
                if len(peers) > 0 {
                    header := ev.Data.(core.ChainHeadEvent).Block.Header()
                    hash := header.Hash()
                    number := header.GetNumberU64()
                    td := core.GetTd(pm.chainDb, hash, number)
                    if td != nil && td.Cmp(lastBroadcastTd) > 0 {
                        var reorg uint64
                        if lastHead != nil {
                            reorg = lastHead.GetNumberU64() - core.FindCommonAncestor(pm.chainDb, header, lastHead).GetNumberU64()
                        }
                        lastHead = header
                        lastBroadcastTd = td
                        //fmt.Println("BROADCAST", number, hash, td, reorg)
                        announce := announceData{Hash: hash, Number: number, Td: td, ReorgDepth: reorg}
                        for _, p := range peers {
                            select {
                            case p.announceChn <- announce:
                            default:
                                pm.removePeer(p.id)
                            }
                        }
                    }
                }
                newCht <- struct{}{}
            case <-newCht:
                go func() {
                    mu.Lock()
                    more := makeCht(pm.chainDb)
                    mu.Unlock()
                    if more {
                        time.Sleep(time.Millisecond * 10)
                        newCht <- struct{}{}
                    }
                }()
            case <-pm.quitSync:
                sub.Unsubscribe()
                pm.wg.Done()
                return
            }
        }
    }()
}

var (
    lastChtKey       = []byte("LastChtNumber") // chtNum (uint64 big endian)
    chtPrefix        = []byte("cht")           // chtPrefix + chtNum (uint64 big endian) -> trie root hash
    chtConfirmations = light.ChtFrequency / 2
)

func getChtRoot(db ethdb.Database, num uint64) common.Hash {
    var encNumber [8]byte
    binary.BigEndian.PutUint64(encNumber[:], num)
    data, _ := db.Get(append(chtPrefix, encNumber[:]...))
    return common.BytesToHash(data)
}

func storeChtRoot(db ethdb.Database, num uint64, root common.Hash) {
    var encNumber [8]byte
    binary.BigEndian.PutUint64(encNumber[:], num)
    db.Put(append(chtPrefix, encNumber[:]...), root[:])
}

func makeCht(db ethdb.Database) bool {
    headHash := core.GetHeadBlockHash(db)
    headNum := core.GetBlockNumber(db, headHash)

    var newChtNum uint64
    if headNum > chtConfirmations {
        newChtNum = (headNum - chtConfirmations) / light.ChtFrequency
    }

    var lastChtNum uint64
    data, _ := db.Get(lastChtKey)
    if len(data) == 8 {
        lastChtNum = binary.BigEndian.Uint64(data[:])
    }
    if newChtNum <= lastChtNum {
        return false
    }

    var t *trie.Trie
    if lastChtNum > 0 {
        var err error
        t, err = trie.New(getChtRoot(db, lastChtNum), db)
        if err != nil {
            lastChtNum = 0
        }
    }
    if lastChtNum == 0 {
        t, _ = trie.New(common.Hash{}, db)
    }

    for num := lastChtNum * light.ChtFrequency; num < (lastChtNum+1)*light.ChtFrequency; num++ {
        hash := core.GetCanonicalHash(db, num)
        if hash == (common.Hash{}) {
            panic("Canonical hash not found")
        }
        td := core.GetTd(db, hash, num)
        if td == nil {
            panic("TD not found")
        }
        var encNumber [8]byte
        binary.BigEndian.PutUint64(encNumber[:], num)
        var node light.ChtNode
        node.Hash = hash
        node.Td = td
        data, _ := rlp.EncodeToBytes(node)
        t.Update(encNumber[:], data)
    }

    root, err := t.Commit()
    if err != nil {
        lastChtNum = 0
    } else {
        lastChtNum++
        fmt.Printf("CHT %d %064x\n", lastChtNum, root)
        storeChtRoot(db, lastChtNum, root)
        var data [8]byte
        binary.BigEndian.PutUint64(data[:], lastChtNum)
        db.Put(lastChtKey, data[:])
    }

    return newChtNum > lastChtNum
}