forked from TrueCloudLab/neoneo-go
5c65d33439
Which duplicates the check, but deduplicates error path. This check forced double balance deserialization which is quite costly operation, so we better do it once. It's hardly noticeable as of TPS metrics though, maybe some 1-2%%.
1064 lines
31 KiB
Go
1064 lines
31 KiB
Go
package native
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import (
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"crypto/elliptic"
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"encoding/binary"
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"errors"
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"fmt"
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"math/big"
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"sort"
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"strings"
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"sync/atomic"
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"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
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"github.com/nspcc-dev/neo-go/pkg/core/dao"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/core/interop/runtime"
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"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/core/storage"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// NEO represents NEO native contract.
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type NEO struct {
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nep17TokenNative
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GAS *GAS
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// gasPerBlock represents current value of generated gas per block.
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// It is append-only and doesn't need to be copied when used.
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gasPerBlock atomic.Value
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gasPerBlockChanged atomic.Value
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registerPrice atomic.Value
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registerPriceChanged atomic.Value
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votesChanged atomic.Value
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nextValidators atomic.Value
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validators atomic.Value
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// committee contains cached committee members and their votes.
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// It is updated once in a while depending on committee size
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// (every 28 blocks for mainnet). It's value
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// is always equal to value stored by `prefixCommittee`.
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committee atomic.Value
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// committeeHash contains script hash of the committee.
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committeeHash atomic.Value
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// gasPerVoteCache contains last updated value of GAS per vote reward for candidates.
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// It is set in state-modifying methods only and read in `PostPersist` thus is not protected
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// by any mutex.
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gasPerVoteCache map[string]big.Int
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}
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const (
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neoContractID = -5
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// NEOTotalSupply is the total amount of NEO in the system.
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NEOTotalSupply = 100000000
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// DefaultRegisterPrice is default price for candidate register.
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DefaultRegisterPrice = 1000 * GASFactor
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// prefixCandidate is a prefix used to store validator's data.
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prefixCandidate = 33
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// prefixVotersCount is a prefix for storing total amount of NEO of voters.
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prefixVotersCount = 1
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// prefixVoterRewardPerCommittee is a prefix for storing committee GAS reward.
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prefixVoterRewardPerCommittee = 23
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// voterRewardFactor is a factor by which voter reward per committee is multiplied
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// to make calculations more precise.
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voterRewardFactor = 100_000_000
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// prefixGASPerBlock is a prefix for storing amount of GAS generated per block.
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prefixGASPerBlock = 29
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// prefixRegisterPrice is a prefix for storing candidate register price.
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prefixRegisterPrice = 13
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// effectiveVoterTurnout represents minimal ratio of total supply to total amount voted value
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// which is require to use non-standby validators.
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effectiveVoterTurnout = 5
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// neoHolderRewardRatio is a percent of generated GAS that is distributed to NEO holders.
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neoHolderRewardRatio = 10
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// neoHolderRewardRatio is a percent of generated GAS that is distributed to committee.
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committeeRewardRatio = 10
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// neoHolderRewardRatio is a percent of generated GAS that is distributed to voters.
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voterRewardRatio = 80
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)
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var (
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// prefixCommittee is a key used to store committee.
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prefixCommittee = []byte{14}
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)
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// makeValidatorKey creates a key from account script hash.
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func makeValidatorKey(key *keys.PublicKey) []byte {
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b := key.Bytes()
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// Don't create a new buffer.
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b = append(b, 0)
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copy(b[1:], b[0:])
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b[0] = prefixCandidate
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return b
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}
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// newNEO returns NEO native contract.
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func newNEO() *NEO {
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n := &NEO{}
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defer n.UpdateHash()
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nep17 := newNEP17Native(nativenames.Neo, neoContractID)
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nep17.symbol = "NEO"
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nep17.decimals = 0
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nep17.factor = 1
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nep17.incBalance = n.increaseBalance
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nep17.balFromBytes = n.balanceFromBytes
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n.nep17TokenNative = *nep17
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n.votesChanged.Store(true)
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n.nextValidators.Store(keys.PublicKeys(nil))
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n.validators.Store(keys.PublicKeys(nil))
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n.committee.Store(keysWithVotes(nil))
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n.committeeHash.Store(util.Uint160{})
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n.registerPriceChanged.Store(true)
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n.gasPerVoteCache = make(map[string]big.Int)
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desc := newDescriptor("unclaimedGas", smartcontract.IntegerType,
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manifest.NewParameter("account", smartcontract.Hash160Type),
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manifest.NewParameter("end", smartcontract.IntegerType))
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md := newMethodAndPrice(n.unclaimedGas, 1<<17, callflag.ReadStates)
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n.AddMethod(md, desc)
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desc = newDescriptor("registerCandidate", smartcontract.BoolType,
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manifest.NewParameter("pubkey", smartcontract.PublicKeyType))
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md = newMethodAndPrice(n.registerCandidate, 0, callflag.States)
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n.AddMethod(md, desc)
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desc = newDescriptor("unregisterCandidate", smartcontract.BoolType,
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manifest.NewParameter("pubkey", smartcontract.PublicKeyType))
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md = newMethodAndPrice(n.unregisterCandidate, 1<<16, callflag.States)
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n.AddMethod(md, desc)
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desc = newDescriptor("vote", smartcontract.BoolType,
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manifest.NewParameter("account", smartcontract.Hash160Type),
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manifest.NewParameter("voteTo", smartcontract.PublicKeyType))
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md = newMethodAndPrice(n.vote, 1<<16, callflag.States)
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n.AddMethod(md, desc)
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desc = newDescriptor("getCandidates", smartcontract.ArrayType)
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md = newMethodAndPrice(n.getCandidatesCall, 1<<22, callflag.ReadStates)
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n.AddMethod(md, desc)
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desc = newDescriptor("getAccountState", smartcontract.ArrayType,
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manifest.NewParameter("account", smartcontract.Hash160Type))
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md = newMethodAndPrice(n.getAccountState, 1<<15, callflag.ReadStates)
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n.AddMethod(md, desc)
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desc = newDescriptor("getCommittee", smartcontract.ArrayType)
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md = newMethodAndPrice(n.getCommittee, 1<<16, callflag.ReadStates)
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n.AddMethod(md, desc)
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desc = newDescriptor("getNextBlockValidators", smartcontract.ArrayType)
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md = newMethodAndPrice(n.getNextBlockValidators, 1<<16, callflag.ReadStates)
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n.AddMethod(md, desc)
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desc = newDescriptor("getGasPerBlock", smartcontract.IntegerType)
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md = newMethodAndPrice(n.getGASPerBlock, 1<<15, callflag.ReadStates)
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n.AddMethod(md, desc)
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desc = newDescriptor("setGasPerBlock", smartcontract.VoidType,
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manifest.NewParameter("gasPerBlock", smartcontract.IntegerType))
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md = newMethodAndPrice(n.setGASPerBlock, 1<<15, callflag.States)
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n.AddMethod(md, desc)
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desc = newDescriptor("getRegisterPrice", smartcontract.IntegerType)
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md = newMethodAndPrice(n.getRegisterPrice, 1<<15, callflag.ReadStates)
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n.AddMethod(md, desc)
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desc = newDescriptor("setRegisterPrice", smartcontract.VoidType,
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manifest.NewParameter("registerPrice", smartcontract.IntegerType))
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md = newMethodAndPrice(n.setRegisterPrice, 1<<15, callflag.States)
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n.AddMethod(md, desc)
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return n
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}
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// Initialize initializes NEO contract.
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func (n *NEO) Initialize(ic *interop.Context) error {
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if err := n.nep17TokenNative.Initialize(ic); err != nil {
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return err
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}
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if n.nep17TokenNative.getTotalSupply(ic.DAO).Sign() != 0 {
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return errors.New("already initialized")
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}
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committee := ic.Chain.GetStandByCommittee()
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cvs := toKeysWithVotes(committee)
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err := n.updateCache(cvs, ic.Chain)
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if err != nil {
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return err
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}
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err = ic.DAO.PutStorageItem(n.ID, prefixCommittee, cvs.Bytes())
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if err != nil {
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return err
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}
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h, err := getStandbyValidatorsHash(ic)
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if err != nil {
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return err
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}
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n.mint(ic, h, big.NewInt(NEOTotalSupply), false)
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var index uint32 = 0
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value := big.NewInt(5 * GASFactor)
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err = n.putGASRecord(ic.DAO, index, value)
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if err != nil {
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return err
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}
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gr := &gasRecord{{Index: index, GASPerBlock: *value}}
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n.gasPerBlock.Store(*gr)
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n.gasPerBlockChanged.Store(false)
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err = ic.DAO.PutStorageItem(n.ID, []byte{prefixVotersCount}, state.StorageItem{})
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if err != nil {
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return err
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}
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err = setIntWithKey(n.ID, ic.DAO, []byte{prefixRegisterPrice}, DefaultRegisterPrice)
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if err != nil {
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return err
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}
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n.registerPrice.Store(int64(DefaultRegisterPrice))
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n.registerPriceChanged.Store(false)
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return nil
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}
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// InitializeCache initializes all NEO cache with the proper values from storage.
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// Cache initialisation should be done apart from Initialize because Initialize is
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// called only when deploying native contracts.
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func (n *NEO) InitializeCache(bc blockchainer.Blockchainer, d dao.DAO) error {
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var committee = keysWithVotes{}
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si := d.GetStorageItem(n.ID, prefixCommittee)
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if err := committee.DecodeBytes(si); err != nil {
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return err
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}
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if err := n.updateCache(committee, bc); err != nil {
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return err
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}
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gr, err := n.getSortedGASRecordFromDAO(d)
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if err != nil {
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return err
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}
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n.gasPerBlock.Store(gr)
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n.gasPerBlockChanged.Store(false)
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return nil
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}
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func (n *NEO) updateCache(cvs keysWithVotes, bc blockchainer.Blockchainer) error {
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n.committee.Store(cvs)
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var committee = n.GetCommitteeMembers()
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script, err := smartcontract.CreateMajorityMultiSigRedeemScript(committee.Copy())
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if err != nil {
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return err
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}
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n.committeeHash.Store(hash.Hash160(script))
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nextVals := committee[:bc.GetConfig().ValidatorsCount].Copy()
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sort.Sort(nextVals)
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n.nextValidators.Store(nextVals)
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return nil
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}
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func (n *NEO) updateCommittee(ic *interop.Context) error {
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votesChanged := n.votesChanged.Load().(bool)
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if !votesChanged {
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// We need to put in storage anyway, as it affects dumps
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committee := n.committee.Load().(keysWithVotes)
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return ic.DAO.PutStorageItem(n.ID, prefixCommittee, committee.Bytes())
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}
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_, cvs, err := n.computeCommitteeMembers(ic.Chain, ic.DAO)
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if err != nil {
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return err
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}
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if err := n.updateCache(cvs, ic.Chain); err != nil {
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return err
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}
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n.votesChanged.Store(false)
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return ic.DAO.PutStorageItem(n.ID, prefixCommittee, cvs.Bytes())
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}
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// ShouldUpdateCommittee returns true if committee is updated at block h.
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func ShouldUpdateCommittee(h uint32, bc blockchainer.Blockchainer) bool {
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cfg := bc.GetConfig()
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r := len(cfg.StandbyCommittee)
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return h%uint32(r) == 0
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}
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// OnPersist implements Contract interface.
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func (n *NEO) OnPersist(ic *interop.Context) error {
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if ShouldUpdateCommittee(ic.Block.Index, ic.Chain) {
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if err := n.updateCommittee(ic); err != nil {
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return err
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}
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}
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return nil
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}
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// PostPersist implements Contract interface.
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func (n *NEO) PostPersist(ic *interop.Context) error {
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gas := n.GetGASPerBlock(ic.DAO, ic.Block.Index)
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pubs := n.GetCommitteeMembers()
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committeeSize := len(ic.Chain.GetConfig().StandbyCommittee)
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index := int(ic.Block.Index) % committeeSize
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committeeReward := new(big.Int).Mul(gas, big.NewInt(committeeRewardRatio))
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n.GAS.mint(ic, pubs[index].GetScriptHash(), committeeReward.Div(committeeReward, big.NewInt(100)), false)
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if ShouldUpdateCommittee(ic.Block.Index, ic.Chain) {
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var voterReward = big.NewInt(voterRewardRatio)
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voterReward.Mul(voterReward, gas)
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voterReward.Mul(voterReward, big.NewInt(voterRewardFactor*int64(committeeSize)))
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var validatorsCount = ic.Chain.GetConfig().ValidatorsCount
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voterReward.Div(voterReward, big.NewInt(int64(committeeSize+validatorsCount)))
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voterReward.Div(voterReward, big.NewInt(100))
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var cs = n.committee.Load().(keysWithVotes)
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var key = make([]byte, 38)
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for i := range cs {
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if cs[i].Votes.Sign() > 0 {
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tmp := big.NewInt(1)
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if i < validatorsCount {
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tmp = big.NewInt(2)
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}
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tmp.Mul(tmp, voterReward)
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tmp.Div(tmp, cs[i].Votes)
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key = makeVoterKey([]byte(cs[i].Key), key)
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var r *big.Int
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if g, ok := n.gasPerVoteCache[cs[i].Key]; ok {
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r = &g
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} else {
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reward := n.getGASPerVote(ic.DAO, key[:34], ic.Block.Index+1)
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r = &reward[0]
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}
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tmp.Add(tmp, r)
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binary.BigEndian.PutUint32(key[34:], ic.Block.Index+1)
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n.gasPerVoteCache[cs[i].Key] = *tmp
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if err := ic.DAO.PutStorageItem(n.ID, key, bigint.ToBytes(tmp)); err != nil {
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return err
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}
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}
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}
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}
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if n.gasPerBlockChanged.Load().(bool) {
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gr, err := n.getSortedGASRecordFromDAO(ic.DAO)
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if err != nil {
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panic(err)
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}
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n.gasPerBlock.Store(gr)
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n.gasPerBlockChanged.Store(false)
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}
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if n.registerPriceChanged.Load().(bool) {
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p := getIntWithKey(n.ID, ic.DAO, []byte{prefixRegisterPrice})
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n.registerPrice.Store(p)
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n.registerPriceChanged.Store(false)
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}
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return nil
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}
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func (n *NEO) getGASPerVote(d dao.DAO, key []byte, index ...uint32) []big.Int {
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var max = make([]uint32, len(index))
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var reward = make([]big.Int, len(index))
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d.Seek(n.ID, key, func(k, v []byte) {
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if len(k) == 4 {
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num := binary.BigEndian.Uint32(k)
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for i, ind := range index {
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if max[i] < num && num <= ind {
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max[i] = num
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reward[i] = *bigint.FromBytes(v)
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}
|
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}
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}
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})
|
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return reward
|
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}
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func (n *NEO) increaseBalance(ic *interop.Context, h util.Uint160, si *state.StorageItem, amount *big.Int, checkBal *big.Int) error {
|
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acc, err := state.NEOBalanceFromBytes(*si)
|
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if err != nil {
|
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return err
|
|
}
|
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if (amount.Sign() == -1 && acc.Balance.Cmp(new(big.Int).Neg(amount)) == -1) ||
|
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(amount.Sign() == 0 && checkBal != nil && acc.Balance.Cmp(checkBal) == -1) {
|
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return errors.New("insufficient funds")
|
|
}
|
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if err := n.distributeGas(ic, h, acc); err != nil {
|
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return err
|
|
}
|
|
if amount.Sign() == 0 {
|
|
*si = acc.Bytes()
|
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return nil
|
|
}
|
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if err := n.ModifyAccountVotes(acc, ic.DAO, amount, false); err != nil {
|
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return err
|
|
}
|
|
if acc.VoteTo != nil {
|
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if err := n.modifyVoterTurnout(ic.DAO, amount); err != nil {
|
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return err
|
|
}
|
|
}
|
|
acc.Balance.Add(&acc.Balance, amount)
|
|
if acc.Balance.Sign() != 0 {
|
|
*si = acc.Bytes()
|
|
} else {
|
|
*si = nil
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *NEO) balanceFromBytes(si *state.StorageItem) (*big.Int, error) {
|
|
acc, err := state.NEOBalanceFromBytes(*si)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &acc.Balance, err
|
|
}
|
|
|
|
func (n *NEO) distributeGas(ic *interop.Context, h util.Uint160, acc *state.NEOBalance) error {
|
|
if ic.Block == nil || ic.Block.Index == 0 {
|
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return nil
|
|
}
|
|
gen, err := n.calculateBonus(ic.DAO, acc.VoteTo, &acc.Balance, acc.BalanceHeight, ic.Block.Index)
|
|
if err != nil {
|
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return err
|
|
}
|
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acc.BalanceHeight = ic.Block.Index
|
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n.GAS.mint(ic, h, gen, true)
|
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return nil
|
|
}
|
|
|
|
func (n *NEO) unclaimedGas(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
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u := toUint160(args[0])
|
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end := uint32(toBigInt(args[1]).Int64())
|
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gen, err := n.CalculateBonus(ic.DAO, u, end)
|
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if err != nil {
|
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panic(err)
|
|
}
|
|
return stackitem.NewBigInteger(gen)
|
|
}
|
|
|
|
func (n *NEO) getGASPerBlock(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
|
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gas := n.GetGASPerBlock(ic.DAO, ic.Block.Index)
|
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return stackitem.NewBigInteger(gas)
|
|
}
|
|
|
|
func (n *NEO) getSortedGASRecordFromDAO(d dao.DAO) (gasRecord, error) {
|
|
grMap, err := d.GetStorageItemsWithPrefix(n.ID, []byte{prefixGASPerBlock})
|
|
if err != nil {
|
|
return gasRecord{}, fmt.Errorf("failed to get gas records from storage: %w", err)
|
|
}
|
|
var (
|
|
i int
|
|
gr = make(gasRecord, len(grMap))
|
|
)
|
|
for indexBytes, gasValue := range grMap {
|
|
gr[i] = gasIndexPair{
|
|
Index: binary.BigEndian.Uint32([]byte(indexBytes)),
|
|
GASPerBlock: *bigint.FromBytes(gasValue),
|
|
}
|
|
i++
|
|
}
|
|
sort.Slice(gr, func(i, j int) bool {
|
|
return gr[i].Index < gr[j].Index
|
|
})
|
|
return gr, nil
|
|
}
|
|
|
|
// GetGASPerBlock returns gas generated for block with provided index.
|
|
func (n *NEO) GetGASPerBlock(d dao.DAO, index uint32) *big.Int {
|
|
var (
|
|
gr gasRecord
|
|
err error
|
|
)
|
|
if n.gasPerBlockChanged.Load().(bool) {
|
|
gr, err = n.getSortedGASRecordFromDAO(d)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
} else {
|
|
gr = n.gasPerBlock.Load().(gasRecord)
|
|
}
|
|
for i := len(gr) - 1; i >= 0; i-- {
|
|
if gr[i].Index <= index {
|
|
g := gr[i].GASPerBlock
|
|
return &g
|
|
}
|
|
}
|
|
panic("contract not initialized")
|
|
}
|
|
|
|
// GetCommitteeAddress returns address of the committee.
|
|
func (n *NEO) GetCommitteeAddress() util.Uint160 {
|
|
return n.committeeHash.Load().(util.Uint160)
|
|
}
|
|
|
|
func (n *NEO) checkCommittee(ic *interop.Context) bool {
|
|
ok, err := runtime.CheckHashedWitness(ic, n.GetCommitteeAddress())
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return ok
|
|
}
|
|
|
|
func (n *NEO) setGASPerBlock(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
gas := toBigInt(args[0])
|
|
err := n.SetGASPerBlock(ic, ic.Block.Index+1, gas)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return stackitem.Null{}
|
|
}
|
|
|
|
// SetGASPerBlock sets gas generated for blocks after index.
|
|
func (n *NEO) SetGASPerBlock(ic *interop.Context, index uint32, gas *big.Int) error {
|
|
if gas.Sign() == -1 || gas.Cmp(big.NewInt(10*GASFactor)) == 1 {
|
|
return errors.New("invalid value for GASPerBlock")
|
|
}
|
|
if !n.checkCommittee(ic) {
|
|
return errors.New("invalid committee signature")
|
|
}
|
|
n.gasPerBlockChanged.Store(true)
|
|
return n.putGASRecord(ic.DAO, index, gas)
|
|
}
|
|
|
|
func (n *NEO) getRegisterPrice(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
|
|
return stackitem.NewBigInteger(big.NewInt(n.getRegisterPriceInternal(ic.DAO)))
|
|
}
|
|
|
|
func (n *NEO) getRegisterPriceInternal(d dao.DAO) int64 {
|
|
if !n.registerPriceChanged.Load().(bool) {
|
|
return n.registerPrice.Load().(int64)
|
|
}
|
|
return getIntWithKey(n.ID, d, []byte{prefixRegisterPrice})
|
|
}
|
|
|
|
func (n *NEO) setRegisterPrice(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
price := toBigInt(args[0])
|
|
if price.Sign() <= 0 || !price.IsInt64() {
|
|
panic("invalid register price")
|
|
}
|
|
if !n.checkCommittee(ic) {
|
|
panic("invalid committee signature")
|
|
}
|
|
|
|
err := setIntWithKey(n.ID, ic.DAO, []byte{prefixRegisterPrice}, price.Int64())
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
n.registerPriceChanged.Store(true)
|
|
return stackitem.Null{}
|
|
}
|
|
|
|
func (n *NEO) dropCandidateIfZero(d dao.DAO, pub *keys.PublicKey, c *candidate) (bool, error) {
|
|
if c.Registered || c.Votes.Sign() != 0 {
|
|
return false, nil
|
|
}
|
|
if err := d.DeleteStorageItem(n.ID, makeValidatorKey(pub)); err != nil {
|
|
return true, err
|
|
}
|
|
|
|
var toRemove []string
|
|
voterKey := makeVoterKey(pub.Bytes())
|
|
d.Seek(n.ID, voterKey, func(k, v []byte) {
|
|
toRemove = append(toRemove, string(k))
|
|
})
|
|
for i := range toRemove {
|
|
if err := d.DeleteStorageItem(n.ID, []byte(toRemove[i])); err != nil {
|
|
return true, err
|
|
}
|
|
}
|
|
delete(n.gasPerVoteCache, string(voterKey))
|
|
|
|
return true, nil
|
|
}
|
|
|
|
func makeVoterKey(pub []byte, prealloc ...[]byte) []byte {
|
|
var key []byte
|
|
if len(prealloc) != 0 {
|
|
key = prealloc[0]
|
|
} else {
|
|
key = make([]byte, 34, 38)
|
|
}
|
|
key[0] = prefixVoterRewardPerCommittee
|
|
copy(key[1:], pub)
|
|
return key
|
|
}
|
|
|
|
// CalculateBonus calculates amount of gas generated for holding value NEO from start to end block
|
|
// and having voted for active committee member.
|
|
func (n *NEO) CalculateBonus(d dao.DAO, acc util.Uint160, end uint32) (*big.Int, error) {
|
|
key := makeAccountKey(acc)
|
|
si := d.GetStorageItem(n.ID, key)
|
|
if si == nil {
|
|
return nil, storage.ErrKeyNotFound
|
|
}
|
|
st, err := state.NEOBalanceFromBytes(si)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return n.calculateBonus(d, st.VoteTo, &st.Balance, st.BalanceHeight, end)
|
|
}
|
|
|
|
func (n *NEO) calculateBonus(d dao.DAO, vote *keys.PublicKey, value *big.Int, start, end uint32) (*big.Int, error) {
|
|
r, err := n.CalculateNEOHolderReward(d, value, start, end)
|
|
if err != nil || vote == nil {
|
|
return r, err
|
|
}
|
|
|
|
var key = makeVoterKey(vote.Bytes())
|
|
var reward = n.getGASPerVote(d, key, start, end)
|
|
var tmp = new(big.Int).Sub(&reward[1], &reward[0])
|
|
tmp.Mul(tmp, value)
|
|
tmp.Div(tmp, big.NewInt(voterRewardFactor))
|
|
tmp.Add(tmp, r)
|
|
return tmp, nil
|
|
}
|
|
|
|
// CalculateNEOHolderReward return GAS reward for holding `value` of NEO from start to end block.
|
|
func (n *NEO) CalculateNEOHolderReward(d dao.DAO, value *big.Int, start, end uint32) (*big.Int, error) {
|
|
if value.Sign() == 0 || start >= end {
|
|
return big.NewInt(0), nil
|
|
} else if value.Sign() < 0 {
|
|
return nil, errors.New("negative value")
|
|
}
|
|
var (
|
|
gr gasRecord
|
|
err error
|
|
)
|
|
if !n.gasPerBlockChanged.Load().(bool) {
|
|
gr = n.gasPerBlock.Load().(gasRecord)
|
|
} else {
|
|
gr, err = n.getSortedGASRecordFromDAO(d)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
var sum, tmp big.Int
|
|
for i := len(gr) - 1; i >= 0; i-- {
|
|
if gr[i].Index >= end {
|
|
continue
|
|
} else if gr[i].Index <= start {
|
|
tmp.SetInt64(int64(end - start))
|
|
tmp.Mul(&tmp, &gr[i].GASPerBlock)
|
|
sum.Add(&sum, &tmp)
|
|
break
|
|
}
|
|
tmp.SetInt64(int64(end - gr[i].Index))
|
|
tmp.Mul(&tmp, &gr[i].GASPerBlock)
|
|
sum.Add(&sum, &tmp)
|
|
end = gr[i].Index
|
|
}
|
|
res := new(big.Int).Mul(value, &sum)
|
|
res.Mul(res, tmp.SetInt64(neoHolderRewardRatio))
|
|
res.Div(res, tmp.SetInt64(100*NEOTotalSupply))
|
|
return res, nil
|
|
}
|
|
|
|
func (n *NEO) registerCandidate(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
pub := toPublicKey(args[0])
|
|
ok, err := runtime.CheckKeyedWitness(ic, pub)
|
|
if err != nil {
|
|
panic(err)
|
|
} else if !ok {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
if !ic.VM.AddGas(n.getRegisterPriceInternal(ic.DAO)) {
|
|
panic("insufficient gas")
|
|
}
|
|
err = n.RegisterCandidateInternal(ic, pub)
|
|
return stackitem.NewBool(err == nil)
|
|
}
|
|
|
|
// RegisterCandidateInternal registers pub as a new candidate.
|
|
func (n *NEO) RegisterCandidateInternal(ic *interop.Context, pub *keys.PublicKey) error {
|
|
key := makeValidatorKey(pub)
|
|
si := ic.DAO.GetStorageItem(n.ID, key)
|
|
var c *candidate
|
|
if si == nil {
|
|
c = &candidate{Registered: true}
|
|
} else {
|
|
c = new(candidate).FromBytes(si)
|
|
c.Registered = true
|
|
}
|
|
return putConvertibleToDAO(n.ID, ic.DAO, key, c)
|
|
}
|
|
|
|
func (n *NEO) unregisterCandidate(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
pub := toPublicKey(args[0])
|
|
ok, err := runtime.CheckKeyedWitness(ic, pub)
|
|
if err != nil {
|
|
panic(err)
|
|
} else if !ok {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
err = n.UnregisterCandidateInternal(ic, pub)
|
|
return stackitem.NewBool(err == nil)
|
|
}
|
|
|
|
// UnregisterCandidateInternal unregisters pub as a candidate.
|
|
func (n *NEO) UnregisterCandidateInternal(ic *interop.Context, pub *keys.PublicKey) error {
|
|
key := makeValidatorKey(pub)
|
|
si := ic.DAO.GetStorageItem(n.ID, key)
|
|
if si == nil {
|
|
return nil
|
|
}
|
|
n.validators.Store(keys.PublicKeys(nil))
|
|
c := new(candidate).FromBytes(si)
|
|
c.Registered = false
|
|
ok, err := n.dropCandidateIfZero(ic.DAO, pub, c)
|
|
if ok {
|
|
return err
|
|
}
|
|
return putConvertibleToDAO(n.ID, ic.DAO, key, c)
|
|
}
|
|
|
|
func (n *NEO) vote(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
acc := toUint160(args[0])
|
|
var pub *keys.PublicKey
|
|
if _, ok := args[1].(stackitem.Null); !ok {
|
|
pub = toPublicKey(args[1])
|
|
}
|
|
err := n.VoteInternal(ic, acc, pub)
|
|
return stackitem.NewBool(err == nil)
|
|
}
|
|
|
|
// VoteInternal votes from account h for validarors specified in pubs.
|
|
func (n *NEO) VoteInternal(ic *interop.Context, h util.Uint160, pub *keys.PublicKey) error {
|
|
ok, err := runtime.CheckHashedWitness(ic, h)
|
|
if err != nil {
|
|
return err
|
|
} else if !ok {
|
|
return errors.New("invalid signature")
|
|
}
|
|
key := makeAccountKey(h)
|
|
si := ic.DAO.GetStorageItem(n.ID, key)
|
|
if si == nil {
|
|
return errors.New("invalid account")
|
|
}
|
|
acc, err := state.NEOBalanceFromBytes(si)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// we should put it in storage anyway as it affects dumps
|
|
err = ic.DAO.PutStorageItem(n.ID, key, si)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if pub != nil {
|
|
valKey := makeValidatorKey(pub)
|
|
valSi := ic.DAO.GetStorageItem(n.ID, valKey)
|
|
if valSi == nil {
|
|
return errors.New("unknown validator")
|
|
}
|
|
cd := new(candidate).FromBytes(valSi)
|
|
// we should put it in storage anyway as it affects dumps
|
|
err = ic.DAO.PutStorageItem(n.ID, valKey, valSi)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !cd.Registered {
|
|
return errors.New("validator must be registered")
|
|
}
|
|
}
|
|
|
|
if (acc.VoteTo == nil) != (pub == nil) {
|
|
val := &acc.Balance
|
|
if pub == nil {
|
|
val = new(big.Int).Neg(val)
|
|
}
|
|
if err := n.modifyVoterTurnout(ic.DAO, val); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if err := n.distributeGas(ic, h, acc); err != nil {
|
|
return err
|
|
}
|
|
if err := n.ModifyAccountVotes(acc, ic.DAO, new(big.Int).Neg(&acc.Balance), false); err != nil {
|
|
return err
|
|
}
|
|
acc.VoteTo = pub
|
|
if err := n.ModifyAccountVotes(acc, ic.DAO, &acc.Balance, true); err != nil {
|
|
return err
|
|
}
|
|
return ic.DAO.PutStorageItem(n.ID, key, acc.Bytes())
|
|
}
|
|
|
|
// ModifyAccountVotes modifies votes of the specified account by value (can be negative).
|
|
// typ specifies if this modify is occurring during transfer or vote (with old or new validator).
|
|
func (n *NEO) ModifyAccountVotes(acc *state.NEOBalance, d dao.DAO, value *big.Int, isNewVote bool) error {
|
|
n.votesChanged.Store(true)
|
|
if acc.VoteTo != nil {
|
|
key := makeValidatorKey(acc.VoteTo)
|
|
si := d.GetStorageItem(n.ID, key)
|
|
if si == nil {
|
|
return errors.New("invalid validator")
|
|
}
|
|
cd := new(candidate).FromBytes(si)
|
|
cd.Votes.Add(&cd.Votes, value)
|
|
if !isNewVote {
|
|
ok, err := n.dropCandidateIfZero(d, acc.VoteTo, cd)
|
|
if ok {
|
|
return err
|
|
}
|
|
}
|
|
n.validators.Store(keys.PublicKeys(nil))
|
|
return putConvertibleToDAO(n.ID, d, key, cd)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *NEO) getCandidates(d dao.DAO, sortByKey bool) ([]keyWithVotes, error) {
|
|
siMap, err := d.GetStorageItemsWithPrefix(n.ID, []byte{prefixCandidate})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
arr := make([]keyWithVotes, 0, len(siMap))
|
|
for key, si := range siMap {
|
|
c := new(candidate).FromBytes(si)
|
|
if c.Registered {
|
|
arr = append(arr, keyWithVotes{Key: key, Votes: &c.Votes})
|
|
}
|
|
}
|
|
if sortByKey {
|
|
// Sort by serialized key bytes (that's the way keys are stored and retrieved from the storage by default).
|
|
sort.Slice(arr, func(i, j int) bool { return strings.Compare(arr[i].Key, arr[j].Key) == -1 })
|
|
} else {
|
|
sort.Slice(arr, func(i, j int) bool {
|
|
// The most-voted validators should end up in the front of the list.
|
|
cmp := arr[i].Votes.Cmp(arr[j].Votes)
|
|
if cmp != 0 {
|
|
return cmp > 0
|
|
}
|
|
// Ties are broken with deserialized public keys.
|
|
// Sort by ECPoint's (X, Y) components: compare X first, and then compare Y.
|
|
cmpX := strings.Compare(arr[i].Key[1:], arr[j].Key[1:])
|
|
if cmpX != 0 {
|
|
return cmpX == -1
|
|
}
|
|
// The case when X components are the same is extremely rare, thus we perform
|
|
// key deserialization only if needed. No error can occur.
|
|
ki, _ := keys.NewPublicKeyFromBytes([]byte(arr[i].Key), elliptic.P256())
|
|
kj, _ := keys.NewPublicKeyFromBytes([]byte(arr[j].Key), elliptic.P256())
|
|
return ki.Y.Cmp(kj.Y) == -1
|
|
})
|
|
}
|
|
return arr, nil
|
|
}
|
|
|
|
// GetCandidates returns current registered validators list with keys
|
|
// and votes.
|
|
func (n *NEO) GetCandidates(d dao.DAO) ([]state.Validator, error) {
|
|
kvs, err := n.getCandidates(d, true)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
arr := make([]state.Validator, len(kvs))
|
|
for i := range kvs {
|
|
arr[i].Key, err = keys.NewPublicKeyFromBytes([]byte(kvs[i].Key), elliptic.P256())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
arr[i].Votes = kvs[i].Votes
|
|
}
|
|
return arr, nil
|
|
}
|
|
|
|
func (n *NEO) getCandidatesCall(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
|
|
validators, err := n.getCandidates(ic.DAO, true)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
arr := make([]stackitem.Item, len(validators))
|
|
for i := range validators {
|
|
arr[i] = stackitem.NewStruct([]stackitem.Item{
|
|
stackitem.NewByteArray([]byte(validators[i].Key)),
|
|
stackitem.NewBigInteger(validators[i].Votes),
|
|
})
|
|
}
|
|
return stackitem.NewArray(arr)
|
|
}
|
|
|
|
func (n *NEO) getAccountState(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
key := makeAccountKey(toUint160(args[0]))
|
|
si := ic.DAO.GetStorageItem(n.ID, key)
|
|
if len(si) == 0 {
|
|
return stackitem.Null{}
|
|
}
|
|
|
|
item, err := stackitem.Deserialize(si)
|
|
if err != nil {
|
|
panic(err) // no errors are expected but we better be sure
|
|
}
|
|
return item
|
|
}
|
|
|
|
// ComputeNextBlockValidators returns an actual list of current validators.
|
|
func (n *NEO) ComputeNextBlockValidators(bc blockchainer.Blockchainer, d dao.DAO) (keys.PublicKeys, error) {
|
|
if vals := n.validators.Load().(keys.PublicKeys); vals != nil {
|
|
return vals.Copy(), nil
|
|
}
|
|
result, _, err := n.computeCommitteeMembers(bc, d)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
result = result[:bc.GetConfig().ValidatorsCount]
|
|
sort.Sort(result)
|
|
n.validators.Store(result)
|
|
return result, nil
|
|
}
|
|
|
|
func (n *NEO) getCommittee(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
|
|
pubs := n.GetCommitteeMembers()
|
|
sort.Sort(pubs)
|
|
return pubsToArray(pubs)
|
|
}
|
|
|
|
func (n *NEO) modifyVoterTurnout(d dao.DAO, amount *big.Int) error {
|
|
key := []byte{prefixVotersCount}
|
|
si := d.GetStorageItem(n.ID, key)
|
|
if si == nil {
|
|
return errors.New("voters count not found")
|
|
}
|
|
votersCount := bigint.FromBytes(si)
|
|
votersCount.Add(votersCount, amount)
|
|
si = bigint.ToPreallocatedBytes(votersCount, si)
|
|
return d.PutStorageItem(n.ID, key, si)
|
|
}
|
|
|
|
// GetCommitteeMembers returns public keys of nodes in committee using cached value.
|
|
func (n *NEO) GetCommitteeMembers() keys.PublicKeys {
|
|
var cvs = n.committee.Load().(keysWithVotes)
|
|
var committee = make(keys.PublicKeys, len(cvs))
|
|
var err error
|
|
for i := range committee {
|
|
committee[i], err = cvs[i].PublicKey()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
}
|
|
return committee
|
|
}
|
|
|
|
func toKeysWithVotes(pubs keys.PublicKeys) keysWithVotes {
|
|
ks := make(keysWithVotes, len(pubs))
|
|
for i := range pubs {
|
|
ks[i].UnmarshaledKey = pubs[i]
|
|
ks[i].Key = string(pubs[i].Bytes())
|
|
ks[i].Votes = big.NewInt(0)
|
|
}
|
|
return ks
|
|
}
|
|
|
|
// computeCommitteeMembers returns public keys of nodes in committee.
|
|
func (n *NEO) computeCommitteeMembers(bc blockchainer.Blockchainer, d dao.DAO) (keys.PublicKeys, keysWithVotes, error) {
|
|
key := []byte{prefixVotersCount}
|
|
si := d.GetStorageItem(n.ID, key)
|
|
if si == nil {
|
|
return nil, nil, errors.New("voters count not found")
|
|
}
|
|
votersCount := bigint.FromBytes(si)
|
|
// votersCount / totalSupply must be >= 0.2
|
|
votersCount.Mul(votersCount, big.NewInt(effectiveVoterTurnout))
|
|
voterTurnout := votersCount.Div(votersCount, n.getTotalSupply(d))
|
|
|
|
sbVals := bc.GetStandByCommittee()
|
|
count := len(sbVals)
|
|
cs, err := n.getCandidates(d, false)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
if voterTurnout.Sign() != 1 || len(cs) < count {
|
|
kvs := make(keysWithVotes, count)
|
|
for i := range kvs {
|
|
kvs[i].UnmarshaledKey = sbVals[i]
|
|
kvs[i].Key = string(sbVals[i].Bytes())
|
|
votes := big.NewInt(0)
|
|
for j := range cs {
|
|
if cs[j].Key == kvs[i].Key {
|
|
votes = cs[j].Votes
|
|
break
|
|
}
|
|
}
|
|
kvs[i].Votes = votes
|
|
}
|
|
return sbVals, kvs, nil
|
|
}
|
|
pubs := make(keys.PublicKeys, count)
|
|
for i := range pubs {
|
|
pubs[i], err = cs[i].PublicKey()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
}
|
|
return pubs, cs[:count], nil
|
|
}
|
|
|
|
func (n *NEO) getNextBlockValidators(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
|
|
result := n.GetNextBlockValidatorsInternal()
|
|
return pubsToArray(result)
|
|
}
|
|
|
|
// GetNextBlockValidatorsInternal returns next block validators.
|
|
func (n *NEO) GetNextBlockValidatorsInternal() keys.PublicKeys {
|
|
return n.nextValidators.Load().(keys.PublicKeys).Copy()
|
|
}
|
|
|
|
// BalanceOf returns native NEO token balance for the acc.
|
|
func (n *NEO) BalanceOf(d dao.DAO, acc util.Uint160) (*big.Int, uint32) {
|
|
key := makeAccountKey(acc)
|
|
si := d.GetStorageItem(n.ID, key)
|
|
if si == nil {
|
|
return big.NewInt(0), 0
|
|
}
|
|
st, err := state.NEOBalanceFromBytes(si)
|
|
if err != nil {
|
|
panic(fmt.Errorf("failed to decode NEO balance state: %w", err))
|
|
}
|
|
return &st.Balance, st.BalanceHeight
|
|
}
|
|
|
|
func pubsToArray(pubs keys.PublicKeys) stackitem.Item {
|
|
arr := make([]stackitem.Item, len(pubs))
|
|
for i := range pubs {
|
|
arr[i] = stackitem.NewByteArray(pubs[i].Bytes())
|
|
}
|
|
return stackitem.NewArray(arr)
|
|
}
|
|
|
|
func toPublicKey(s stackitem.Item) *keys.PublicKey {
|
|
buf, err := s.TryBytes()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
pub := new(keys.PublicKey)
|
|
if err := pub.DecodeBytes(buf); err != nil {
|
|
panic(err)
|
|
}
|
|
return pub
|
|
}
|
|
|
|
// putGASRecord is a helper which creates key and puts GASPerBlock value into the storage.
|
|
func (n *NEO) putGASRecord(dao dao.DAO, index uint32, value *big.Int) error {
|
|
key := make([]byte, 5)
|
|
key[0] = prefixGASPerBlock
|
|
binary.BigEndian.PutUint32(key[1:], index)
|
|
return dao.PutStorageItem(n.ID, key, bigint.ToBytes(value))
|
|
}
|