aboutsummaryrefslogtreecommitdiffstats
path: root/core/genesis.go
blob: 8f55d3a37e6ad52ba8390c02ef6f964dcb878ff5 (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
// Copyright 2014 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 core

import (
    "errors"
    "fmt"
    "math/big"
    "strings"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/common/hexutil"
    "github.com/ethereum/go-ethereum/common/math"
    "github.com/ethereum/go-ethereum/core/state"
    "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"
)

//go:generate gencodec -type Genesis -field-override genesisSpecMarshaling -out gen_genesis.go
//go:generate gencodec -type GenesisAccount -field-override genesisAccountMarshaling -out gen_genesis_account.go

var errGenesisNoConfig = errors.New("genesis has no chain configuration")

// Genesis specifies the header fields, state of a genesis block. It also defines hard
// fork switch-over blocks through the chain configuration.
type Genesis struct {
    Config     *params.ChainConfig `json:"config"`
    Nonce      uint64              `json:"nonce"`
    Timestamp  uint64              `json:"timestamp"`
    ParentHash common.Hash         `json:"parentHash"`
    ExtraData  []byte              `json:"extraData"`
    GasLimit   uint64              `json:"gasLimit"   gencodec:"required"`
    Difficulty *big.Int            `json:"difficulty" gencodec:"required"`
    Mixhash    common.Hash         `json:"mixHash"`
    Coinbase   common.Address      `json:"coinbase"`
    Alloc      GenesisAlloc        `json:"alloc"      gencodec:"required"`
}

// GenesisAlloc specifies the initial state that is part of the genesis block.
type GenesisAlloc map[common.Address]GenesisAccount

// GenesisAccount is an account in the state of the genesis block.
type GenesisAccount struct {
    Code    []byte                      `json:"code,omitempty"`
    Storage map[common.Hash]common.Hash `json:"storage,omitempty"`
    Balance *big.Int                    `json:"balance" gencodec:"required"`
    Nonce   uint64                      `json:"nonce,omitempty"`
}

// field type overrides for gencodec
type genesisSpecMarshaling struct {
    Nonce      math.HexOrDecimal64
    Timestamp  math.HexOrDecimal64
    ExtraData  hexutil.Bytes
    GasLimit   math.HexOrDecimal64
    Difficulty *math.HexOrDecimal256
    Alloc      map[common.UnprefixedAddress]GenesisAccount
}
type genesisAccountMarshaling struct {
    Code    hexutil.Bytes
    Balance *math.HexOrDecimal256
    Nonce   math.HexOrDecimal64
}

// GenesisMismatchError is raised when trying to overwrite an existing
// genesis block with an incompatible one.
type GenesisMismatchError struct {
    Stored, New common.Hash
}

func (e *GenesisMismatchError) Error() string {
    return fmt.Sprintf("database already contains an incompatible genesis block (have %x, new %x)", e.Stored[:8], e.New[:8])
}

// SetupGenesisBlock writes or updates the genesis block in db.
// The block that will be used is:
//
//                          genesis == nil       genesis != nil
//                       +------------------------------------------
//     db has no genesis |  main-net default  |  genesis
//     db has genesis    |  from DB           |  genesis (if compatible)
//
// The stored chain configuration will be updated if it is compatible (i.e. does not
// specify a fork block below the local head block). In case of a conflict, the
// error is a *params.ConfigCompatError and the new, unwritten config is returned.
//
// The returned chain configuration is never nil.
func SetupGenesisBlock(db ethdb.Database, genesis *Genesis) (*params.ChainConfig, common.Hash, error) {
    if genesis != nil && genesis.Config == nil {
        return params.AllProtocolChanges, common.Hash{}, errGenesisNoConfig
    }

    // Just commit the new block if there is no stored genesis block.
    stored := GetCanonicalHash(db, 0)
    if (stored == common.Hash{}) {
        if genesis == nil {
            log.Info("Writing default main-net genesis block")
            genesis = DefaultGenesisBlock()
        } else {
            log.Info("Writing custom genesis block")
        }
        block, err := genesis.Commit(db)
        return genesis.Config, block.Hash(), err
    }

    // Check whether the genesis block is already written.
    if genesis != nil {
        block, _ := genesis.ToBlock()
        hash := block.Hash()
        if hash != stored {
            return genesis.Config, block.Hash(), &GenesisMismatchError{stored, hash}
        }
    }

    // Get the existing chain configuration.
    newcfg := genesis.configOrDefault(stored)
    storedcfg, err := GetChainConfig(db, stored)
    if err != nil {
        if err == ChainConfigNotFoundErr {
            // This case happens if a genesis write was interrupted.
            log.Warn("Found genesis block without chain config")
            err = WriteChainConfig(db, stored, newcfg)
        }
        return newcfg, stored, err
    }
    // Special case: don't change the existing config of a non-mainnet chain if no new
    // config is supplied. These chains would get AllProtocolChanges (and a compat error)
    // if we just continued here.
    if genesis == nil && stored != params.MainNetGenesisHash {
        return storedcfg, stored, nil
    }

    // Check config compatibility and write the config. Compatibility errors
    // are returned to the caller unless we're already at block zero.
    height := GetBlockNumber(db, GetHeadHeaderHash(db))
    if height == missingNumber {
        return newcfg, stored, fmt.Errorf("missing block number for head header hash")
    }
    compatErr := storedcfg.CheckCompatible(newcfg, height)
    if compatErr != nil && height != 0 && compatErr.RewindTo != 0 {
        return newcfg, stored, compatErr
    }
    return newcfg, stored, WriteChainConfig(db, stored, newcfg)
}

func (g *Genesis) configOrDefault(ghash common.Hash) *params.ChainConfig {
    switch {
    case g != nil:
        return g.Config
    case ghash == params.MainNetGenesisHash:
        return params.MainnetChainConfig
    case ghash == params.TestNetGenesisHash:
        return params.TestnetChainConfig
    default:
        return params.AllProtocolChanges
    }
}

// ToBlock creates the block and state of a genesis specification.
func (g *Genesis) ToBlock() (*types.Block, *state.StateDB) {
    db, _ := ethdb.NewMemDatabase()
    statedb, _ := state.New(common.Hash{}, db)
    for addr, account := range g.Alloc {
        statedb.AddBalance(addr, account.Balance)
        statedb.SetCode(addr, account.Code)
        statedb.SetNonce(addr, account.Nonce)
        for key, value := range account.Storage {
            statedb.SetState(addr, key, value)
        }
    }
    root := statedb.IntermediateRoot(false)
    head := &types.Header{
        Nonce:      types.EncodeNonce(g.Nonce),
        Time:       new(big.Int).SetUint64(g.Timestamp),
        ParentHash: g.ParentHash,
        Extra:      g.ExtraData,
        GasLimit:   new(big.Int).SetUint64(g.GasLimit),
        Difficulty: g.Difficulty,
        MixDigest:  g.Mixhash,
        Coinbase:   g.Coinbase,
        Root:       root,
    }
    if g.GasLimit == 0 {
        head.GasLimit = params.GenesisGasLimit
    }
    if g.Difficulty == nil {
        head.Difficulty = params.GenesisDifficulty
    }
    return types.NewBlock(head, nil, nil, nil), statedb
}

// Commit writes the block and state of a genesis specification to the database.
// The block is committed as the canonical head block.
func (g *Genesis) Commit(db ethdb.Database) (*types.Block, error) {
    block, statedb := g.ToBlock()
    if _, err := statedb.CommitTo(db, false); err != nil {
        return nil, fmt.Errorf("cannot write state: %v", err)
    }
    if err := WriteTd(db, block.Hash(), block.NumberU64(), g.Difficulty); err != nil {
        return nil, err
    }
    if err := WriteBlock(db, block); err != nil {
        return nil, err
    }
    if err := WriteBlockReceipts(db, block.Hash(), block.NumberU64(), nil); err != nil {
        return nil, err
    }
    if err := WriteCanonicalHash(db, block.Hash(), block.NumberU64()); err != nil {
        return nil, err
    }
    if err := WriteHeadBlockHash(db, block.Hash()); err != nil {
        return nil, err
    }
    if err := WriteHeadHeaderHash(db, block.Hash()); err != nil {
        return nil, err
    }
    config := g.Config
    if config == nil {
        config = params.AllProtocolChanges
    }
    return block, WriteChainConfig(db, block.Hash(), config)
}

// MustCommit writes the genesis block and state to db, panicking on error.
// The block is committed as the canonical head block.
func (g *Genesis) MustCommit(db ethdb.Database) *types.Block {
    block, err := g.Commit(db)
    if err != nil {
        panic(err)
    }
    return block
}

// GenesisBlockForTesting creates and writes a block in which addr has the given wei balance.
func GenesisBlockForTesting(db ethdb.Database, addr common.Address, balance *big.Int) *types.Block {
    g := Genesis{Alloc: GenesisAlloc{addr: {Balance: balance}}}
    return g.MustCommit(db)
}

// DefaultGenesisBlock returns the Ethereum main net genesis block.
func DefaultGenesisBlock() *Genesis {
    return &Genesis{
        Config:     params.MainnetChainConfig,
        Nonce:      66,
        ExtraData:  hexutil.MustDecode("0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"),
        GasLimit:   5000,
        Difficulty: big.NewInt(17179869184),
        Alloc:      decodePrealloc(mainnetAllocData),
    }
}

// DefaultTestnetGenesisBlock returns the Ropsten network genesis block.
func DefaultTestnetGenesisBlock() *Genesis {
    return &Genesis{
        Config:     params.TestnetChainConfig,
        Nonce:      66,
        ExtraData:  hexutil.MustDecode("0x3535353535353535353535353535353535353535353535353535353535353535"),
        GasLimit:   16777216,
        Difficulty: big.NewInt(1048576),
        Alloc:      decodePrealloc(testnetAllocData),
    }
}

// DefaultRinkebyGenesisBlock returns the Rinkeby network genesis block.
func DefaultRinkebyGenesisBlock() *Genesis {
    return &Genesis{
        Config:     params.RinkebyChainConfig,
        Timestamp:  1492009146,
        ExtraData:  hexutil.MustDecode("0x52657370656374206d7920617574686f7269746168207e452e436172746d616e42eb768f2244c8811c63729a21a3569731535f067ffc57839b00206d1ad20c69a1981b489f772031b279182d99e65703f0076e4812653aab85fca0f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"),
        GasLimit:   4700000,
        Difficulty: big.NewInt(1),
        Alloc:      decodePrealloc(rinkebyAllocData),
    }
}

// DevGenesisBlock returns the 'geth --dev' genesis block.
func DevGenesisBlock() *Genesis {
    return &Genesis{
        Config:     params.AllProtocolChanges,
        Nonce:      42,
        GasLimit:   4712388,
        Difficulty: big.NewInt(131072),
        Alloc:      decodePrealloc(devAllocData),
    }
}

func decodePrealloc(data string) GenesisAlloc {
    var p []struct{ Addr, Balance *big.Int }
    if err := rlp.NewStream(strings.NewReader(data), 0).Decode(&p); err != nil {
        panic(err)
    }
    ga := make(GenesisAlloc, len(p))
    for _, account := range p {
        ga[common.BigToAddress(account.Addr)] = GenesisAccount{Balance: account.Balance}
    }
    return ga
}