aboutsummaryrefslogtreecommitdiffstats
path: root/light/postprocess.go
blob: 702eb53c8637e4980fe56fafd4ce80339b38f5fb (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
// Copyright 2017 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 light

import (
    "encoding/binary"
    "errors"
    "math/big"
    "time"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/common/bitutil"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/log"
    "github.com/ethereum/go-ethereum/params"
    "github.com/ethereum/go-ethereum/rlp"
    "github.com/ethereum/go-ethereum/trie"
)

const (
    // CHTFrequencyClient is the block frequency for creating CHTs on the client side.
    CHTFrequencyClient = 32768

    // CHTFrequencyServer is the block frequency for creating CHTs on the server side.
    // Eventually this can be merged back with the client version, but that requires a
    // full database upgrade, so that should be left for a suitable moment.
    CHTFrequencyServer = 4096

    HelperTrieConfirmations        = 2048 // number of confirmations before a server is expected to have the given HelperTrie available
    HelperTrieProcessConfirmations = 256  // number of confirmations before a HelperTrie is generated
)

// trustedCheckpoint represents a set of post-processed trie roots (CHT and BloomTrie) associated with
// the appropriate section index and head hash. It is used to start light syncing from this checkpoint
// and avoid downloading the entire header chain while still being able to securely access old headers/logs.
type trustedCheckpoint struct {
    name                                string
    sectionIdx                          uint64
    sectionHead, chtRoot, bloomTrieRoot common.Hash
}

var (
    mainnetCheckpoint = trustedCheckpoint{
        name:          "mainnet",
        sectionIdx:    165,
        sectionHead:   common.HexToHash("21028acf9cd9ce80257221adc437c3c58ce046c4d43c21c3e9b1d1349059ec73"),
        chtRoot:       common.HexToHash("26b2458cb7d0080d3a39311c914be92c368777a65ec074e1893b8bdc79e3910a"),
        bloomTrieRoot: common.HexToHash("5d06908769179186165a72db7fc3473b25c28ed27efe78a392a9ff2c3fa67f84"),
    }

    ropstenCheckpoint = trustedCheckpoint{
        name:          "ropsten",
        sectionIdx:    92,
        sectionHead:   common.HexToHash("21a158f9cc643da13a237cafceb37381072649f7278cf98c5820bfbced7cfcec"),
        chtRoot:       common.HexToHash("1a8ddb8b086d7a33ca90eea90730225948fa504ae0283b15aff3c15c0e089bf9"),
        bloomTrieRoot: common.HexToHash("fd192f92afbcdd0020c81ca0625116b5995509659653b10123bd986fe5129cc1"),
    }
)

// trustedCheckpoints associates each known checkpoint with the genesis hash of the chain it belongs to
var trustedCheckpoints = map[common.Hash]trustedCheckpoint{
    params.MainnetGenesisHash: mainnetCheckpoint,
    params.TestnetGenesisHash: ropstenCheckpoint,
}

var (
    ErrNoTrustedCht       = errors.New("No trusted canonical hash trie")
    ErrNoTrustedBloomTrie = errors.New("No trusted bloom trie")
    ErrNoHeader           = errors.New("Header not found")
    chtPrefix             = []byte("chtRoot-") // chtPrefix + chtNum (uint64 big endian) -> trie root hash
    ChtTablePrefix        = "cht-"
)

// ChtNode structures are stored in the Canonical Hash Trie in an RLP encoded format
type ChtNode struct {
    Hash common.Hash
    Td   *big.Int
}

// GetChtRoot reads the CHT root assoctiated to the given section from the database
// Note that sectionIdx is specified according to LES/1 CHT section size
func GetChtRoot(db ethdb.Database, sectionIdx uint64, sectionHead common.Hash) common.Hash {
    var encNumber [8]byte
    binary.BigEndian.PutUint64(encNumber[:], sectionIdx)
    data, _ := db.Get(append(append(chtPrefix, encNumber[:]...), sectionHead.Bytes()...))
    return common.BytesToHash(data)
}

// GetChtV2Root reads the CHT root assoctiated to the given section from the database
// Note that sectionIdx is specified according to LES/2 CHT section size
func GetChtV2Root(db ethdb.Database, sectionIdx uint64, sectionHead common.Hash) common.Hash {
    return GetChtRoot(db, (sectionIdx+1)*(CHTFrequencyClient/CHTFrequencyServer)-1, sectionHead)
}

// StoreChtRoot writes the CHT root assoctiated to the given section into the database
// Note that sectionIdx is specified according to LES/1 CHT section size
func StoreChtRoot(db ethdb.Database, sectionIdx uint64, sectionHead, root common.Hash) {
    var encNumber [8]byte
    binary.BigEndian.PutUint64(encNumber[:], sectionIdx)
    db.Put(append(append(chtPrefix, encNumber[:]...), sectionHead.Bytes()...), root.Bytes())
}

// ChtIndexerBackend implements core.ChainIndexerBackend
type ChtIndexerBackend struct {
    diskdb               ethdb.Database
    triedb               *trie.Database
    section, sectionSize uint64
    lastHash             common.Hash
    trie                 *trie.Trie
}

// NewBloomTrieIndexer creates a BloomTrie chain indexer
func NewChtIndexer(db ethdb.Database, clientMode bool) *core.ChainIndexer {
    var sectionSize, confirmReq uint64
    if clientMode {
        sectionSize = CHTFrequencyClient
        confirmReq = HelperTrieConfirmations
    } else {
        sectionSize = CHTFrequencyServer
        confirmReq = HelperTrieProcessConfirmations
    }
    idb := ethdb.NewTable(db, "chtIndex-")
    backend := &ChtIndexerBackend{
        diskdb:      db,
        triedb:      trie.NewDatabase(ethdb.NewTable(db, ChtTablePrefix)),
        sectionSize: sectionSize,
    }
    return core.NewChainIndexer(db, idb, backend, sectionSize, confirmReq, time.Millisecond*100, "cht")
}

// Reset implements core.ChainIndexerBackend
func (c *ChtIndexerBackend) Reset(section uint64, lastSectionHead common.Hash) error {
    var root common.Hash
    if section > 0 {
        root = GetChtRoot(c.diskdb, section-1, lastSectionHead)
    }
    var err error
    c.trie, err = trie.New(root, c.triedb)
    c.section = section
    return err
}

// Process implements core.ChainIndexerBackend
func (c *ChtIndexerBackend) Process(header *types.Header) {
    hash, num := header.Hash(), header.Number.Uint64()
    c.lastHash = hash

    td := core.GetTd(c.diskdb, hash, num)
    if td == nil {
        panic(nil)
    }
    var encNumber [8]byte
    binary.BigEndian.PutUint64(encNumber[:], num)
    data, _ := rlp.EncodeToBytes(ChtNode{hash, td})
    c.trie.Update(encNumber[:], data)
}

// Commit implements core.ChainIndexerBackend
func (c *ChtIndexerBackend) Commit() error {
    root, err := c.trie.Commit(nil)
    if err != nil {
        return err
    }
    c.triedb.Commit(root, false)

    if ((c.section+1)*c.sectionSize)%CHTFrequencyClient == 0 {
        log.Info("Storing CHT", "section", c.section*c.sectionSize/CHTFrequencyClient, "head", c.lastHash, "root", root)
    }
    StoreChtRoot(c.diskdb, c.section, c.lastHash, root)
    return nil
}

const (
    BloomTrieFrequency        = 32768
    ethBloomBitsSection       = 4096
    ethBloomBitsConfirmations = 256
)

var (
    bloomTriePrefix      = []byte("bltRoot-") // bloomTriePrefix + bloomTrieNum (uint64 big endian) -> trie root hash
    BloomTrieTablePrefix = "blt-"
)

// GetBloomTrieRoot reads the BloomTrie root assoctiated to the given section from the database
func GetBloomTrieRoot(db ethdb.Database, sectionIdx uint64, sectionHead common.Hash) common.Hash {
    var encNumber [8]byte
    binary.BigEndian.PutUint64(encNumber[:], sectionIdx)
    data, _ := db.Get(append(append(bloomTriePrefix, encNumber[:]...), sectionHead.Bytes()...))
    return common.BytesToHash(data)
}

// StoreBloomTrieRoot writes the BloomTrie root assoctiated to the given section into the database
func StoreBloomTrieRoot(db ethdb.Database, sectionIdx uint64, sectionHead, root common.Hash) {
    var encNumber [8]byte
    binary.BigEndian.PutUint64(encNumber[:], sectionIdx)
    db.Put(append(append(bloomTriePrefix, encNumber[:]...), sectionHead.Bytes()...), root.Bytes())
}

// BloomTrieIndexerBackend implements core.ChainIndexerBackend
type BloomTrieIndexerBackend struct {
    diskdb                                     ethdb.Database
    triedb                                     *trie.Database
    section, parentSectionSize, bloomTrieRatio uint64
    trie                                       *trie.Trie
    sectionHeads                               []common.Hash
}

// NewBloomTrieIndexer creates a BloomTrie chain indexer
func NewBloomTrieIndexer(db ethdb.Database, clientMode bool) *core.ChainIndexer {
    backend := &BloomTrieIndexerBackend{
        diskdb: db,
        triedb: trie.NewDatabase(ethdb.NewTable(db, BloomTrieTablePrefix)),
    }
    idb := ethdb.NewTable(db, "bltIndex-")

    var confirmReq uint64
    if clientMode {
        backend.parentSectionSize = BloomTrieFrequency
        confirmReq = HelperTrieConfirmations
    } else {
        backend.parentSectionSize = ethBloomBitsSection
        confirmReq = HelperTrieProcessConfirmations
    }
    backend.bloomTrieRatio = BloomTrieFrequency / backend.parentSectionSize
    backend.sectionHeads = make([]common.Hash, backend.bloomTrieRatio)
    return core.NewChainIndexer(db, idb, backend, BloomTrieFrequency, confirmReq-ethBloomBitsConfirmations, time.Millisecond*100, "bloomtrie")
}

// Reset implements core.ChainIndexerBackend
func (b *BloomTrieIndexerBackend) Reset(section uint64, lastSectionHead common.Hash) error {
    var root common.Hash
    if section > 0 {
        root = GetBloomTrieRoot(b.diskdb, section-1, lastSectionHead)
    }
    var err error
    b.trie, err = trie.New(root, b.triedb)
    b.section = section
    return err
}

// Process implements core.ChainIndexerBackend
func (b *BloomTrieIndexerBackend) Process(header *types.Header) {
    num := header.Number.Uint64() - b.section*BloomTrieFrequency
    if (num+1)%b.parentSectionSize == 0 {
        b.sectionHeads[num/b.parentSectionSize] = header.Hash()
    }
}

// Commit implements core.ChainIndexerBackend
func (b *BloomTrieIndexerBackend) Commit() error {
    var compSize, decompSize uint64

    for i := uint(0); i < types.BloomBitLength; i++ {
        var encKey [10]byte
        binary.BigEndian.PutUint16(encKey[0:2], uint16(i))
        binary.BigEndian.PutUint64(encKey[2:10], b.section)
        var decomp []byte
        for j := uint64(0); j < b.bloomTrieRatio; j++ {
            data, err := core.GetBloomBits(b.diskdb, i, b.section*b.bloomTrieRatio+j, b.sectionHeads[j])
            if err != nil {
                return err
            }
            decompData, err2 := bitutil.DecompressBytes(data, int(b.parentSectionSize/8))
            if err2 != nil {
                return err2
            }
            decomp = append(decomp, decompData...)
        }
        comp := bitutil.CompressBytes(decomp)

        decompSize += uint64(len(decomp))
        compSize += uint64(len(comp))
        if len(comp) > 0 {
            b.trie.Update(encKey[:], comp)
        } else {
            b.trie.Delete(encKey[:])
        }
    }
    root, err := b.trie.Commit(nil)
    if err != nil {
        return err
    }
    b.triedb.Commit(root, false)

    sectionHead := b.sectionHeads[b.bloomTrieRatio-1]
    log.Info("Storing bloom trie", "section", b.section, "head", sectionHead, "root", root, "compression", float64(compSize)/float64(decompSize))
    StoreBloomTrieRoot(b.diskdb, b.section, sectionHead, root)

    return nil
}