forked from TrueCloudLab/neoneo-go
ac527650eb
But don't change the way we process/store transactions and blocks. Effectively it's just an interface for smart contracts that replaces old syscalls. Transaction definition is moved temporarily to runtime package and Block definition is removed (till we solve #1691 properly).
932 lines
27 KiB
Go
932 lines
27 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/io"
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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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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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}
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const (
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neoContractID = -3
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// NEOTotalSupply is the total amount of NEO in the system.
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NEOTotalSupply = 100000000
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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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// 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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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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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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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, 3000000, 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.ByteArrayType))
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md = newMethodAndPrice(n.registerCandidate, 1000_00000000, callflag.WriteStates)
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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.ByteArrayType))
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md = newMethodAndPrice(n.unregisterCandidate, 5000000, callflag.WriteStates)
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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("pubkey", smartcontract.ByteArrayType))
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md = newMethodAndPrice(n.vote, 5000000, callflag.WriteStates)
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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, 100000000, callflag.ReadStates)
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n.AddMethod(md, desc)
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desc = newDescriptor("getСommittee", smartcontract.ArrayType)
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md = newMethodAndPrice(n.getCommittee, 100000000, 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, 100000000, 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, 100_0000, 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, 500_0000, callflag.WriteStates)
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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.ContractID, prefixCommittee, &state.StorageItem{Value: 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.ContractID, []byte{prefixVotersCount}, &state.StorageItem{Value: []byte{}})
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if err != nil {
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return err
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}
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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.ContractID, prefixCommittee)
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if err := committee.DecodeBytes(si.Value); 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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si := &state.StorageItem{Value: committee.Bytes()}
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return ic.DAO.PutStorageItem(n.ContractID, prefixCommittee, si)
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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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si := &state.StorageItem{Value: cvs.Bytes()}
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return ic.DAO.PutStorageItem(n.ContractID, prefixCommittee, si)
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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 si = new(state.StorageItem)
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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 reward = n.getGASPerVote(ic.DAO, key[:34], ic.Block.Index+1)
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tmp.Add(tmp, &reward[0])
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binary.BigEndian.PutUint32(key[34:], ic.Block.Index+1)
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si.Value = bigint.ToBytes(tmp)
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if err := ic.DAO.PutStorageItem(n.ContractID, key, si); 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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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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var si state.StorageItem
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d.Seek(n.ContractID, 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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r := io.NewBinReaderFromBuf(v)
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si.DecodeBinary(r)
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if r.Err != nil {
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return
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}
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reward[i] = *bigint.FromBytes(si.Value)
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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) error {
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acc, err := state.NEOBalanceStateFromBytes(si.Value)
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if err != nil {
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return err
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}
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if amount.Sign() == -1 && acc.Balance.Cmp(new(big.Int).Neg(amount)) == -1 {
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return errors.New("insufficient funds")
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}
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if err := n.distributeGas(ic, h, acc); err != nil {
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return err
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}
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if amount.Sign() == 0 {
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si.Value = acc.Bytes()
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return nil
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}
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if err := n.ModifyAccountVotes(acc, ic.DAO, amount, false); err != nil {
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return err
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}
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if acc.VoteTo != nil {
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if err := n.modifyVoterTurnout(ic.DAO, amount); err != nil {
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return err
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}
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}
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acc.Balance.Add(&acc.Balance, amount)
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if acc.Balance.Sign() != 0 {
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si.Value = acc.Bytes()
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} else {
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si.Value = nil
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}
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return nil
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}
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func (n *NEO) distributeGas(ic *interop.Context, h util.Uint160, acc *state.NEOBalanceState) error {
|
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if ic.Block == nil || ic.Block.Index == 0 {
|
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return nil
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}
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gen, err := n.calculateBonus(ic.DAO, acc.VoteTo, &acc.Balance, acc.BalanceHeight, ic.Block.Index)
|
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if err != nil {
|
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return err
|
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}
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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
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}
|
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|
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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)
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}
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return stackitem.NewBigInteger(gen)
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}
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|
|
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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)
|
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}
|
|
|
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func (n *NEO) getSortedGASRecordFromDAO(d dao.DAO) (gasRecord, error) {
|
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grMap, err := d.GetStorageItemsWithPrefix(n.ContractID, []byte{prefixGASPerBlock})
|
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if err != nil {
|
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return gasRecord{}, fmt.Errorf("failed to get gas records from storage: %w", err)
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|
}
|
|
var (
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i int
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gr = make(gasRecord, len(grMap))
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|
)
|
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for indexBytes, gasValue := range grMap {
|
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gr[i] = gasIndexPair{
|
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Index: binary.BigEndian.Uint32([]byte(indexBytes)),
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GASPerBlock: *bigint.FromBytes(gasValue.Value),
|
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}
|
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i++
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}
|
|
sort.Slice(gr, func(i, j int) bool {
|
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return gr[i].Index < gr[j].Index
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})
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|
return gr, nil
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|
}
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|
|
// GetGASPerBlock returns gas generated for block with provided index.
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|
func (n *NEO) GetGASPerBlock(d dao.DAO, index uint32) *big.Int {
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var (
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gr gasRecord
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err error
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)
|
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if n.gasPerBlockChanged.Load().(bool) {
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gr, err = n.getSortedGASRecordFromDAO(d)
|
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if err != nil {
|
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panic(err)
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}
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} else {
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gr = n.gasPerBlock.Load().(gasRecord)
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}
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for i := len(gr) - 1; i >= 0; i-- {
|
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if gr[i].Index <= index {
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g := gr[i].GASPerBlock
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return &g
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}
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}
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panic("contract not initialized")
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|
}
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|
|
// GetCommitteeAddress returns address of the committee.
|
|
func (n *NEO) GetCommitteeAddress() util.Uint160 {
|
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return n.committeeHash.Load().(util.Uint160)
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}
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|
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func (n *NEO) checkCommittee(ic *interop.Context) bool {
|
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ok, err := runtime.CheckHashedWitness(ic, n.GetCommitteeAddress())
|
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if err != nil {
|
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panic(err)
|
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}
|
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return ok
|
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}
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|
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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) 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.ContractID, makeValidatorKey(pub)); err != nil {
|
|
return true, err
|
|
}
|
|
|
|
var toRemove []string
|
|
d.Seek(n.ContractID, makeVoterKey(pub.Bytes()), func(k, v []byte) {
|
|
toRemove = append(toRemove, string(k))
|
|
})
|
|
for i := range toRemove {
|
|
if err := d.DeleteStorageItem(n.ContractID, []byte(toRemove[i])); err != nil {
|
|
return true, err
|
|
}
|
|
}
|
|
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.ContractID, key)
|
|
if si == nil {
|
|
return nil, storage.ErrKeyNotFound
|
|
}
|
|
st, err := state.NEOBalanceStateFromBytes(si.Value)
|
|
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)
|
|
}
|
|
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.ContractID, key)
|
|
if si == nil {
|
|
c := &candidate{Registered: true}
|
|
si = &state.StorageItem{Value: c.Bytes()}
|
|
} else {
|
|
c := new(candidate).FromBytes(si.Value)
|
|
c.Registered = true
|
|
si.Value = c.Bytes()
|
|
}
|
|
return ic.DAO.PutStorageItem(n.ContractID, key, si)
|
|
}
|
|
|
|
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.ContractID, key)
|
|
if si == nil {
|
|
return nil
|
|
}
|
|
n.validators.Store(keys.PublicKeys(nil))
|
|
c := new(candidate).FromBytes(si.Value)
|
|
c.Registered = false
|
|
ok, err := n.dropCandidateIfZero(ic.DAO, pub, c)
|
|
if ok {
|
|
return err
|
|
}
|
|
si.Value = c.Bytes()
|
|
return ic.DAO.PutStorageItem(n.ContractID, key, si)
|
|
}
|
|
|
|
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.ContractID, key)
|
|
if si == nil {
|
|
return errors.New("invalid account")
|
|
}
|
|
acc, err := state.NEOBalanceStateFromBytes(si.Value)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
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
|
|
}
|
|
si.Value = acc.Bytes()
|
|
return ic.DAO.PutStorageItem(n.ContractID, key, si)
|
|
}
|
|
|
|
// 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.NEOBalanceState, 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.ContractID, key)
|
|
if si == nil {
|
|
return errors.New("invalid validator")
|
|
}
|
|
cd := new(candidate).FromBytes(si.Value)
|
|
cd.Votes.Add(&cd.Votes, value)
|
|
if !isNewVote {
|
|
ok, err := n.dropCandidateIfZero(d, acc.VoteTo, cd)
|
|
if ok {
|
|
return err
|
|
}
|
|
} else if !cd.Registered {
|
|
return errors.New("validator must be registered")
|
|
}
|
|
n.validators.Store(keys.PublicKeys(nil))
|
|
si.Value = cd.Bytes()
|
|
return d.PutStorageItem(n.ContractID, key, si)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *NEO) getCandidates(d dao.DAO, sortByKey bool) ([]keyWithVotes, error) {
|
|
siMap, err := d.GetStorageItemsWithPrefix(n.ContractID, []byte{prefixCandidate})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
arr := make([]keyWithVotes, 0, len(siMap))
|
|
for key, si := range siMap {
|
|
c := new(candidate).FromBytes(si.Value)
|
|
if c.Registered {
|
|
arr = append(arr, keyWithVotes{Key: key, Votes: &c.Votes})
|
|
}
|
|
}
|
|
if sortByKey {
|
|
sort.Slice(arr, func(i, j int) bool { return strings.Compare(arr[i].Key[1:], arr[j].Key[1:]) == -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 public keys.
|
|
return strings.Compare(arr[i].Key[1:], arr[j].Key[1:]) == -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)
|
|
}
|
|
|
|
// 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.ContractID, key)
|
|
if si == nil {
|
|
return errors.New("voters count not found")
|
|
}
|
|
votersCount := bigint.FromBytes(si.Value)
|
|
votersCount.Add(votersCount, amount)
|
|
si.Value = bigint.ToBytes(votersCount)
|
|
return d.PutStorageItem(n.ContractID, 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.ContractID, key)
|
|
if si == nil {
|
|
return nil, nil, errors.New("voters count not found")
|
|
}
|
|
votersCount := bigint.FromBytes(si.Value)
|
|
// 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()
|
|
}
|
|
|
|
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)
|
|
si := &state.StorageItem{
|
|
Value: bigint.ToBytes(value),
|
|
IsConst: false,
|
|
}
|
|
return dao.PutStorageItem(n.ContractID, key, si)
|
|
}
|