github.com/nnlgsakib/mind-dpos@v0.0.0-20230606105614-f3c8ca06f808/params/config.go (about)

     1  // Copyright 2016 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package params
    18  
    19  import (
    20  	"fmt"
    21  	"github.com/TTCECO/gttc/common"
    22  	"github.com/TTCECO/gttc/rpc"
    23  	"math/big"
    24  )
    25  
    26  var (
    27  	MainnetGenesisHash = common.HexToHash("t0c6f20167950874a396ca06b717df8cd96597bc849b4935003cda98598c5e98be") // Mainnet genesis hash to enforce below configs on
    28  	TestnetGenesisHash = common.HexToHash("t01fa3701d9164c47b587e335e9d4c2a34360dd77c84859c818ba7ea684bdf6ee1") // Testnet genesis hash to enforce below configs on
    29  )
    30  
    31  var (
    32  	// MainnetChainConfig is the chain parameters to run a node on the main network.
    33  	MainnetChainConfig = &ChainConfig{
    34  		ChainId:             big.NewInt(8848),
    35  		HomesteadBlock:      big.NewInt(1),
    36  		EIP150Block:         big.NewInt(2),
    37  		EIP150Hash:          common.HexToHash("0x0000000000000000000000000000000000000000000000000000000000000000"),
    38  		EIP155Block:         big.NewInt(3),
    39  		EIP158Block:         big.NewInt(3),
    40  		ByzantiumBlock:      big.NewInt(4),
    41  		ConstantinopleBlock: nil,
    42  		Alien: &AlienConfig{
    43  			Period:           3,
    44  			Epoch:            201600,
    45  			MaxSignerCount:   21,
    46  			TrantorBlock:     new(big.Int).SetUint64(2968888),
    47  			MinVoterBalance:  new(big.Int).Mul(big.NewInt(100), big.NewInt(1e+18)),
    48  			GenesisTimestamp: 1554004800,
    49  			SelfVoteSigners: []common.UnprefixedAddress{
    50  				common.UnprefixedAddress(common.HexToAddress("t06e83430ca56ee33a26e5ce87239cb251981ccc2b")),
    51  				common.UnprefixedAddress(common.HexToAddress("t01807efcb4dc252ff6958eaab770c8b3936a5378f")),
    52  				common.UnprefixedAddress(common.HexToAddress("t0350fccf36124cecd26318e9931414ce872bdb68c")),
    53  				common.UnprefixedAddress(common.HexToAddress("t009cbad80e089754f610cb8771d9eca05e4e22bdb")),
    54  				common.UnprefixedAddress(common.HexToAddress("t09d507c10960531c9adc0ffdc9d9c735167275caf")),
    55  				common.UnprefixedAddress(common.HexToAddress("t0c252c0f4d460554c679532072c8dbecd8d9ee89b")),
    56  				common.UnprefixedAddress(common.HexToAddress("t0d8f68e2af8a061f0ea5e57ab7aca1b7fa96dab8a")),
    57  				common.UnprefixedAddress(common.HexToAddress("t00c58019b9c8e293e3be8d3fd50f77af5f2e84bb7")),
    58  				common.UnprefixedAddress(common.HexToAddress("t065dd958f7433cbe8353401d131c925e0424330b6")),
    59  				common.UnprefixedAddress(common.HexToAddress("t0076c15f06f36b15544f1e97b4aacbd358d60cdf0")),
    60  				common.UnprefixedAddress(common.HexToAddress("t0ecfd032885b4b9e69ab732e800c72296733165d7")),
    61  				common.UnprefixedAddress(common.HexToAddress("t01a7910fe43b49b8bc33c04cb138cb2a8e1842f32")),
    62  				common.UnprefixedAddress(common.HexToAddress("t0f52fe2e8decbbb3b00ebec7a1a50a41055d784ea")),
    63  				common.UnprefixedAddress(common.HexToAddress("t035ef874a0f12581fd01fd2b178da7472475e253c")),
    64  				common.UnprefixedAddress(common.HexToAddress("t090d4a9e77bf64b58f7c07d3bc19f8bb5e9d49031")),
    65  				common.UnprefixedAddress(common.HexToAddress("t07bd38c427c685fbecbbe0daf49cda466b6475cc6")),
    66  				common.UnprefixedAddress(common.HexToAddress("t0db1f586092917033e15298663594abb01eb98e39")),
    67  				common.UnprefixedAddress(common.HexToAddress("t049574ad7832ff9a9214eb462cce2accf35f9118c")),
    68  				common.UnprefixedAddress(common.HexToAddress("t0c8a7ca612be71d84c82c2c1fefbd035517df6745")),
    69  				common.UnprefixedAddress(common.HexToAddress("t07e13706bab4bfae1f856d75e96676ab27eeea083")),
    70  				common.UnprefixedAddress(common.HexToAddress("t0c5981e7fb6726be96345a732de6206bb1d66b963")),
    71  				common.UnprefixedAddress(common.HexToAddress("t0ba99e0bb3fb9537db76a8ac1e76ebca5177954c9")),
    72  				common.UnprefixedAddress(common.HexToAddress("t0d039d1feb6b13c3abe5089da9157fd41104c1aee")),
    73  				common.UnprefixedAddress(common.HexToAddress("t0532c8772925e4b55a6bc99e954aa4cacc7d152b3")),
    74  				common.UnprefixedAddress(common.HexToAddress("t0b464963fcb52b4666577987538a45e68876dc4e7")),
    75  				common.UnprefixedAddress(common.HexToAddress("t08967f6d04ce36683ebe08c55caa15a177447f983")),
    76  				common.UnprefixedAddress(common.HexToAddress("t005f39bfe9588f9297b8f3b019a3ee336efe47c47")),
    77  				common.UnprefixedAddress(common.HexToAddress("t00c59dd1a15c3d5db4b4297cd79bfe72b60affc3e")),
    78  				common.UnprefixedAddress(common.HexToAddress("t08f05387c4d637288dd197e26d5bdd3cb7087793c")),
    79  				common.UnprefixedAddress(common.HexToAddress("t002289f35b60c97e27141c6aeb2691d25b531c755")),
    80  				common.UnprefixedAddress(common.HexToAddress("t039e18521278e5121fdb0b691e84869bd4c645241")),
    81  				common.UnprefixedAddress(common.HexToAddress("t04b4a0c8cb17b50d8d22610b307c349b63560ca4b")),
    82  				common.UnprefixedAddress(common.HexToAddress("t09b25f97fa4e3892d9a86ac035a338b36dace5c4b")),
    83  				common.UnprefixedAddress(common.HexToAddress("t0c520c15d943603dc333ebf6b5e39eb4d509fc1f8")),
    84  				common.UnprefixedAddress(common.HexToAddress("t0da863ba260a36a11e3ea953b61de4a0eeffaa6f5")),
    85  				common.UnprefixedAddress(common.HexToAddress("t03692048ef49479294bcfe9ee7e97508633756f3f")),
    86  				common.UnprefixedAddress(common.HexToAddress("t027f7fcf7938618dfb0fc3668cd6fe7c1f7315870")),
    87  				common.UnprefixedAddress(common.HexToAddress("t0f34961e5654a76335e0480bd7c7d370ad41ac74f")),
    88  				common.UnprefixedAddress(common.HexToAddress("t092918ee96f529fdabab1a1ffda627c3d6b442ad9")),
    89  				common.UnprefixedAddress(common.HexToAddress("t02024cc8d89f7cbd09a4085fbc729e3b9ee92c1be")),
    90  				common.UnprefixedAddress(common.HexToAddress("t01b5887157beff2e2eff9ea9b8409f3ca1b6a052f")),
    91  				common.UnprefixedAddress(common.HexToAddress("t0ad11612be2d9811ffe80f9e9ec1bbdc0ff34067c")),
    92  				common.UnprefixedAddress(common.HexToAddress("t04e3011ab5b261cff133f4e8fb597dd0980814a94")),
    93  				common.UnprefixedAddress(common.HexToAddress("t02834dc6b4b054fcf9cb206df4cce17fa0044826b")),
    94  				common.UnprefixedAddress(common.HexToAddress("t07a2da45fd12d9bd44227ec58a5f0c3085ef18bf1")),
    95  				common.UnprefixedAddress(common.HexToAddress("t0e8ae4d470fb87381f34a77c992a1de53fc2d2a3c")),
    96  				common.UnprefixedAddress(common.HexToAddress("t0777689118d95751e1d709d7134adddd387226ac3")),
    97  				common.UnprefixedAddress(common.HexToAddress("t00d6556b96b2b7cd095bf42aa2c287df99f22fc87")),
    98  				common.UnprefixedAddress(common.HexToAddress("t0b97b279af3aa97655e6592b320e94505b41631ec")),
    99  				common.UnprefixedAddress(common.HexToAddress("t0bce13d77339971d1f5f00c38f523ba7ee44c95ed")),
   100  			},
   101  		},
   102  	}
   103  
   104  	// TestnetChainConfig contains the chain parameters to run a node on the Ropsten test network.
   105  	TestnetChainConfig = &ChainConfig{
   106  		ChainId:             big.NewInt(8341),
   107  		HomesteadBlock:      big.NewInt(1),
   108  		EIP150Block:         big.NewInt(2),
   109  		EIP150Hash:          common.HexToHash("0x0000000000000000000000000000000000000000000000000000000000000000"),
   110  		EIP155Block:         big.NewInt(3),
   111  		EIP158Block:         big.NewInt(3),
   112  		ByzantiumBlock:      big.NewInt(4),
   113  		ConstantinopleBlock: nil,
   114  		Alien: &AlienConfig{
   115  			Period:           3,
   116  			Epoch:            201600,
   117  			MaxSignerCount:   21,
   118  			MinVoterBalance:  new(big.Int).Mul(big.NewInt(100), big.NewInt(1e+18)),
   119  			TrantorBlock:     big.NewInt(695000),
   120  			GenesisTimestamp: 1554004800,
   121  			SelfVoteSigners: []common.UnprefixedAddress{
   122  				common.UnprefixedAddress(common.HexToAddress("t0be6865ffcbbe5f9746bef5c84b912f2ad9e52075")),
   123  				common.UnprefixedAddress(common.HexToAddress("t04909b4e54395de9e313ad8a2254fe2dcda99e91c")),
   124  				common.UnprefixedAddress(common.HexToAddress("t0a034350c8e80eb4d15ac62310657b29c711bb3d5")),
   125  			},
   126  		},
   127  	}
   128  
   129  	// SideChainConfig contains the chain parameters to run a node on the Ropsten test network.
   130  	SideChainConfig = &ChainConfig{
   131  		ChainId:             big.NewInt(8123),
   132  		HomesteadBlock:      big.NewInt(1),
   133  		EIP150Block:         big.NewInt(2),
   134  		EIP150Hash:          common.HexToHash("0x0000000000000000000000000000000000000000000000000000000000000000"),
   135  		EIP155Block:         big.NewInt(3),
   136  		EIP158Block:         big.NewInt(3),
   137  		ByzantiumBlock:      big.NewInt(4),
   138  		ConstantinopleBlock: nil,
   139  		Alien: &AlienConfig{
   140  			Period:           1,
   141  			Epoch:            201600,
   142  			MaxSignerCount:   21,
   143  			TrantorBlock:     big.NewInt(5),
   144  			MinVoterBalance:  new(big.Int).Mul(big.NewInt(100), big.NewInt(1e+18)),
   145  			GenesisTimestamp: 1554004800,
   146  			SelfVoteSigners:  []common.UnprefixedAddress{},
   147  		},
   148  	}
   149  
   150  	// RinkebyChainConfig contains the chain parameters to run a node on the Rinkeby test network.
   151  	RinkebyChainConfig = &ChainConfig{
   152  		ChainId:             big.NewInt(4),
   153  		HomesteadBlock:      big.NewInt(1),
   154  		EIP150Block:         big.NewInt(2),
   155  		EIP150Hash:          common.HexToHash("0x9b095b36c15eaf13044373aef8ee0bd3a382a5abb92e402afa44b8249c3a90e9"),
   156  		EIP155Block:         big.NewInt(3),
   157  		EIP158Block:         big.NewInt(3),
   158  		ByzantiumBlock:      big.NewInt(1035301),
   159  		ConstantinopleBlock: nil,
   160  		Clique: &CliqueConfig{
   161  			Period: 15,
   162  			Epoch:  30000,
   163  		},
   164  	}
   165  
   166  	// AllEthashProtocolChanges contains every protocol change (EIPs) introduced
   167  	// and accepted by the Ethereum core developers into the Ethash consensus.
   168  	//
   169  	// This configuration is intentionally not using keyed fields to force anyone
   170  	// adding flags to the config to also have to set these fields.
   171  	AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil, nil}
   172  
   173  	// AllCliqueProtocolChanges contains every protocol change (EIPs) introduced
   174  	// and accepted by the Ethereum core developers into the Clique consensus.
   175  	//
   176  	// This configuration is intentionally not using keyed fields to force anyone
   177  	// adding flags to the config to also have to set these fields.
   178  	AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}, nil}
   179  
   180  	// AllAlienProtocolChanges contains every protocol change (EIPs) introduced
   181  	// and accepted by the Ethereum core developers into the Alien consensus.
   182  	//
   183  	// This configuration is intentionally not using keyed fields to force anyone
   184  	// adding flags to the config to also have to set these fields.
   185  	AllAlienProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, &AlienConfig{Period: 3, Epoch: 30000, MaxSignerCount: 21, MinVoterBalance: new(big.Int).Mul(big.NewInt(10000), big.NewInt(1000000000000000000)), GenesisTimestamp: 0, SelfVoteSigners: []common.UnprefixedAddress{}}}
   186  
   187  	TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil, nil}
   188  	TestRules       = TestChainConfig.Rules(new(big.Int))
   189  )
   190  
   191  // ChainConfig is the core config which determines the blockchain settings.
   192  //
   193  // ChainConfig is stored in the database on a per block basis. This means
   194  // that any network, identified by its genesis block, can have its own
   195  // set of configuration options.
   196  type ChainConfig struct {
   197  	ChainId *big.Int `json:"chainId"` // Chain id identifies the current chain and is used for replay protection
   198  
   199  	HomesteadBlock *big.Int `json:"homesteadBlock,omitempty"` // Homestead switch block (nil = no fork, 0 = already homestead)
   200  
   201  	// EIP150 implements the Gas price changes (https://github.com/ethereum/EIPs/issues/150)
   202  	EIP150Block *big.Int    `json:"eip150Block,omitempty"` // EIP150 HF block (nil = no fork)
   203  	EIP150Hash  common.Hash `json:"eip150Hash,omitempty"`  // EIP150 HF hash (needed for header only clients as only gas pricing changed)
   204  
   205  	EIP155Block *big.Int `json:"eip155Block,omitempty"` // EIP155 HF block
   206  	EIP158Block *big.Int `json:"eip158Block,omitempty"` // EIP158 HF block
   207  
   208  	ByzantiumBlock      *big.Int `json:"byzantiumBlock,omitempty"`      // Byzantium switch block (nil = no fork, 0 = already on byzantium)
   209  	ConstantinopleBlock *big.Int `json:"constantinopleBlock,omitempty"` // Constantinople switch block (nil = no fork, 0 = already activated)
   210  
   211  	// Various consensus engines
   212  	Ethash *EthashConfig `json:"ethash,omitempty"`
   213  	Clique *CliqueConfig `json:"clique,omitempty"`
   214  	Alien  *AlienConfig  `json:"alien,omitempty"`
   215  }
   216  
   217  // EthashConfig is the consensus engine configs for proof-of-work based sealing.
   218  type EthashConfig struct{}
   219  
   220  // String implements the stringer interface, returning the consensus engine details.
   221  func (c *EthashConfig) String() string {
   222  	return "ethash"
   223  }
   224  
   225  // CliqueConfig is the consensus engine configs for proof-of-authority based sealing.
   226  type CliqueConfig struct {
   227  	Period uint64 `json:"period"` // Number of seconds between blocks to enforce
   228  	Epoch  uint64 `json:"epoch"`  // Epoch length to reset votes and checkpoint
   229  }
   230  
   231  // String implements the stringer interface, returning the consensus engine details.
   232  func (c *CliqueConfig) String() string {
   233  	return "clique"
   234  }
   235  
   236  type GenesisAccount struct {
   237  	Balance string `json:"balance"`
   238  }
   239  
   240  // AlienLightConfig is the config for light node of alien
   241  type AlienLightConfig struct {
   242  	Alloc map[common.UnprefixedAddress]GenesisAccount `json:"alloc"`
   243  }
   244  
   245  // AlienConfig is the consensus engine configs for delegated-proof-of-stake based sealing.
   246  type AlienConfig struct {
   247  	Period           uint64                     `json:"period"`           // Number of seconds between blocks to enforce
   248  	Epoch            uint64                     `json:"epoch"`            // Epoch length to reset votes and checkpoint
   249  	MaxSignerCount   uint64                     `json:"maxSignersCount"`  // Max count of signers
   250  	MinVoterBalance  *big.Int                   `json:"minVoterBalance"`  // Min voter balance to valid this vote
   251  	GenesisTimestamp uint64                     `json:"genesisTimestamp"` // The LoopStartTime of first Block
   252  	SelfVoteSigners  []common.UnprefixedAddress `json:"signers"`          // Signers vote by themselves to seal the block, make sure the signer accounts are pre-funded
   253  	SideChain        bool                       `json:"sideChain"`        // If side chain or not
   254  	MCRPCClient      *rpc.Client                // Main chain rpc client for side chain
   255  	PBFTEnable       bool                       `json:"pbft"` //
   256  
   257  	TrantorBlock  *big.Int          `json:"trantorBlock,omitempty"`  // Trantor switch block (nil = no fork)
   258  	TerminusBlock *big.Int          `json:"terminusBlock,omitempty"` // Terminus switch block (nil = no fork)
   259  	LightConfig   *AlienLightConfig `json:"lightConfig,omitempty"`
   260  }
   261  
   262  // String implements the stringer interface, returning the consensus engine details.
   263  func (a *AlienConfig) String() string {
   264  	return "alien"
   265  }
   266  
   267  // IsTrantor returns whether num is either equal to the Trantor block or greater.
   268  func (a *AlienConfig) IsTrantor(num *big.Int) bool {
   269  	return isForked(a.TrantorBlock, num)
   270  }
   271  
   272  // IsTerminus returns whether num is either equal to the Terminus block or greater.
   273  func (a *AlienConfig) IsTerminus(num *big.Int) bool {
   274  	return isForked(a.TerminusBlock, num)
   275  }
   276  
   277  // String implements the fmt.Stringer interface.
   278  func (c *ChainConfig) String() string {
   279  	var engine interface{}
   280  	switch {
   281  	case c.Ethash != nil:
   282  		engine = c.Ethash
   283  	case c.Clique != nil:
   284  		engine = c.Clique
   285  	case c.Alien != nil:
   286  		engine = c.Alien
   287  	default:
   288  		engine = "unknown"
   289  	}
   290  	return fmt.Sprintf("{ChainID: %v Homestead: %v EIP150: %v EIP155: %v EIP158: %v Byzantium: %v Constantinople: %v Engine: %v}",
   291  		c.ChainId,
   292  		c.HomesteadBlock,
   293  		c.EIP150Block,
   294  		c.EIP155Block,
   295  		c.EIP158Block,
   296  		c.ByzantiumBlock,
   297  		c.ConstantinopleBlock,
   298  		engine,
   299  	)
   300  }
   301  
   302  // IsHomestead returns whether num is either equal to the homestead block or greater.
   303  func (c *ChainConfig) IsHomestead(num *big.Int) bool {
   304  	return isForked(c.HomesteadBlock, num)
   305  }
   306  
   307  func (c *ChainConfig) IsEIP150(num *big.Int) bool {
   308  	return isForked(c.EIP150Block, num)
   309  }
   310  
   311  func (c *ChainConfig) IsEIP155(num *big.Int) bool {
   312  	return isForked(c.EIP155Block, num)
   313  }
   314  
   315  func (c *ChainConfig) IsEIP158(num *big.Int) bool {
   316  	return isForked(c.EIP158Block, num)
   317  }
   318  
   319  func (c *ChainConfig) IsByzantium(num *big.Int) bool {
   320  	return isForked(c.ByzantiumBlock, num)
   321  }
   322  
   323  func (c *ChainConfig) IsConstantinople(num *big.Int) bool {
   324  	return isForked(c.ConstantinopleBlock, num)
   325  }
   326  
   327  // GasTable returns the gas table corresponding to the current phase (homestead or homestead reprice).
   328  //
   329  // The returned GasTable's fields shouldn't, under any circumstances, be changed.
   330  func (c *ChainConfig) GasTable(num *big.Int) GasTable {
   331  	if num == nil {
   332  		return GasTableHomestead
   333  	}
   334  	switch {
   335  	case c.IsEIP158(num):
   336  		return GasTableEIP158
   337  	case c.IsEIP150(num):
   338  		return GasTableEIP150
   339  	default:
   340  		return GasTableHomestead
   341  	}
   342  }
   343  
   344  // CheckCompatible checks whether scheduled fork transitions have been imported
   345  // with a mismatching chain configuration.
   346  func (c *ChainConfig) CheckCompatible(newcfg *ChainConfig, height uint64) *ConfigCompatError {
   347  	bhead := new(big.Int).SetUint64(height)
   348  
   349  	// Iterate checkCompatible to find the lowest conflict.
   350  	var lasterr *ConfigCompatError
   351  	for {
   352  		err := c.checkCompatible(newcfg, bhead)
   353  		if err == nil || (lasterr != nil && err.RewindTo == lasterr.RewindTo) {
   354  			break
   355  		}
   356  		lasterr = err
   357  		bhead.SetUint64(err.RewindTo)
   358  	}
   359  	return lasterr
   360  }
   361  
   362  func (c *ChainConfig) checkCompatible(newcfg *ChainConfig, head *big.Int) *ConfigCompatError {
   363  	if isForkIncompatible(c.HomesteadBlock, newcfg.HomesteadBlock, head) {
   364  		return newCompatError("Homestead fork block", c.HomesteadBlock, newcfg.HomesteadBlock)
   365  	}
   366  	if isForkIncompatible(c.EIP150Block, newcfg.EIP150Block, head) {
   367  		return newCompatError("EIP150 fork block", c.EIP150Block, newcfg.EIP150Block)
   368  	}
   369  	if isForkIncompatible(c.EIP155Block, newcfg.EIP155Block, head) {
   370  		return newCompatError("EIP155 fork block", c.EIP155Block, newcfg.EIP155Block)
   371  	}
   372  	if isForkIncompatible(c.EIP158Block, newcfg.EIP158Block, head) {
   373  		return newCompatError("EIP158 fork block", c.EIP158Block, newcfg.EIP158Block)
   374  	}
   375  	if c.IsEIP158(head) && !configNumEqual(c.ChainId, newcfg.ChainId) {
   376  		return newCompatError("EIP158 chain ID", c.EIP158Block, newcfg.EIP158Block)
   377  	}
   378  	if isForkIncompatible(c.ByzantiumBlock, newcfg.ByzantiumBlock, head) {
   379  		return newCompatError("Byzantium fork block", c.ByzantiumBlock, newcfg.ByzantiumBlock)
   380  	}
   381  	if isForkIncompatible(c.ConstantinopleBlock, newcfg.ConstantinopleBlock, head) {
   382  		return newCompatError("Constantinople fork block", c.ConstantinopleBlock, newcfg.ConstantinopleBlock)
   383  	}
   384  	return nil
   385  }
   386  
   387  // isForkIncompatible returns true if a fork scheduled at s1 cannot be rescheduled to
   388  // block s2 because head is already past the fork.
   389  func isForkIncompatible(s1, s2, head *big.Int) bool {
   390  	return (isForked(s1, head) || isForked(s2, head)) && !configNumEqual(s1, s2)
   391  }
   392  
   393  // isForked returns whether a fork scheduled at block s is active at the given head block.
   394  func isForked(s, head *big.Int) bool {
   395  	if s == nil || head == nil {
   396  		return false
   397  	}
   398  	return s.Cmp(head) <= 0
   399  }
   400  
   401  func configNumEqual(x, y *big.Int) bool {
   402  	if x == nil {
   403  		return y == nil
   404  	}
   405  	if y == nil {
   406  		return x == nil
   407  	}
   408  	return x.Cmp(y) == 0
   409  }
   410  
   411  // ConfigCompatError is raised if the locally-stored blockchain is initialised with a
   412  // ChainConfig that would alter the past.
   413  type ConfigCompatError struct {
   414  	What string
   415  	// block numbers of the stored and new configurations
   416  	StoredConfig, NewConfig *big.Int
   417  	// the block number to which the local chain must be rewound to correct the error
   418  	RewindTo uint64
   419  }
   420  
   421  func newCompatError(what string, storedblock, newblock *big.Int) *ConfigCompatError {
   422  	var rew *big.Int
   423  	switch {
   424  	case storedblock == nil:
   425  		rew = newblock
   426  	case newblock == nil || storedblock.Cmp(newblock) < 0:
   427  		rew = storedblock
   428  	default:
   429  		rew = newblock
   430  	}
   431  	err := &ConfigCompatError{what, storedblock, newblock, 0}
   432  	if rew != nil && rew.Sign() > 0 {
   433  		err.RewindTo = rew.Uint64() - 1
   434  	}
   435  	return err
   436  }
   437  
   438  func (err *ConfigCompatError) Error() string {
   439  	return fmt.Sprintf("mismatching %s in database (have %d, want %d, rewindto %d)", err.What, err.StoredConfig, err.NewConfig, err.RewindTo)
   440  }
   441  
   442  // Rules wraps ChainConfig and is merely syntatic sugar or can be used for functions
   443  // that do not have or require information about the block.
   444  //
   445  // Rules is a one time interface meaning that it shouldn't be used in between transition
   446  // phases.
   447  type Rules struct {
   448  	ChainId                                   *big.Int
   449  	IsHomestead, IsEIP150, IsEIP155, IsEIP158 bool
   450  	IsByzantium                               bool
   451  }
   452  
   453  func (c *ChainConfig) Rules(num *big.Int) Rules {
   454  	chainId := c.ChainId
   455  	if chainId == nil {
   456  		chainId = new(big.Int)
   457  	}
   458  	return Rules{ChainId: new(big.Int).Set(chainId), IsHomestead: c.IsHomestead(num), IsEIP150: c.IsEIP150(num), IsEIP155: c.IsEIP155(num), IsEIP158: c.IsEIP158(num), IsByzantium: c.IsByzantium(num)}
   459  }