491 lines
16 KiB
Go
491 lines
16 KiB
Go
package native
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import (
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"encoding/binary"
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"fmt"
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"math/big"
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"sort"
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"sync"
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"github.com/nspcc-dev/neo-go/pkg/core/block"
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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/state"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/network/payload"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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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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const (
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policyName = "Policy"
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policyContractID = -3
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defaultMaxBlockSize = 1024 * 256
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defaultMaxTransactionsPerBlock = 512
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defaultFeePerByte = 1000
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defaultMaxVerificationGas = 50000000
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defaultMaxBlockSystemFee = 9000 * GASFactor
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// minBlockSystemFee is the minimum allowed system fee per block.
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minBlockSystemFee = 4007600
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// maxFeePerByte is the maximum allowed fee per byte value.
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maxFeePerByte = 100_000_000
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// blockedAccountPrefix is a prefix used to store blocked account.
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blockedAccountPrefix = 15
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)
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var (
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// maxTransactionsPerBlockKey is a key used to store the maximum number of
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// transactions allowed in block.
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maxTransactionsPerBlockKey = []byte{23}
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// feePerByteKey is a key used to store the minimum fee per byte for
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// transaction.
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feePerByteKey = []byte{10}
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// maxBlockSizeKey is a key used to store the maximum block size value.
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maxBlockSizeKey = []byte{12}
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// maxBlockSystemFeeKey is a key used to store the maximum block system fee value.
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maxBlockSystemFeeKey = []byte{17}
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)
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// Policy represents Policy native contract.
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type Policy struct {
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interop.ContractMD
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lock sync.RWMutex
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// isValid defies whether cached values were changed during the current
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// consensus iteration. If false, these values will be updated after
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// blockchain DAO persisting. If true, we can safely use cached values.
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isValid bool
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maxTransactionsPerBlock uint32
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maxBlockSize uint32
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feePerByte int64
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maxBlockSystemFee int64
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maxVerificationGas int64
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blockedAccounts []util.Uint160
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}
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var _ interop.Contract = (*Policy)(nil)
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// newPolicy returns Policy native contract.
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func newPolicy() *Policy {
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p := &Policy{ContractMD: *interop.NewContractMD(policyName)}
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p.ContractID = policyContractID
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desc := newDescriptor("getMaxTransactionsPerBlock", smartcontract.IntegerType)
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md := newMethodAndPrice(p.getMaxTransactionsPerBlock, 1000000, smartcontract.AllowStates)
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p.AddMethod(md, desc, true)
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desc = newDescriptor("getMaxBlockSize", smartcontract.IntegerType)
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md = newMethodAndPrice(p.getMaxBlockSize, 1000000, smartcontract.AllowStates)
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p.AddMethod(md, desc, true)
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desc = newDescriptor("getFeePerByte", smartcontract.IntegerType)
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md = newMethodAndPrice(p.getFeePerByte, 1000000, smartcontract.AllowStates)
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p.AddMethod(md, desc, true)
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desc = newDescriptor("isBlocked", smartcontract.BoolType,
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manifest.NewParameter("account", smartcontract.Hash160Type))
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md = newMethodAndPrice(p.isBlocked, 1000000, smartcontract.AllowStates)
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p.AddMethod(md, desc, true)
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desc = newDescriptor("getMaxBlockSystemFee", smartcontract.IntegerType)
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md = newMethodAndPrice(p.getMaxBlockSystemFee, 1000000, smartcontract.AllowStates)
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p.AddMethod(md, desc, true)
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desc = newDescriptor("setMaxBlockSize", smartcontract.BoolType,
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manifest.NewParameter("value", smartcontract.IntegerType))
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md = newMethodAndPrice(p.setMaxBlockSize, 3000000, smartcontract.AllowModifyStates)
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p.AddMethod(md, desc, false)
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desc = newDescriptor("setMaxTransactionsPerBlock", smartcontract.BoolType,
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manifest.NewParameter("value", smartcontract.IntegerType))
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md = newMethodAndPrice(p.setMaxTransactionsPerBlock, 3000000, smartcontract.AllowModifyStates)
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p.AddMethod(md, desc, false)
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desc = newDescriptor("setFeePerByte", smartcontract.BoolType,
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manifest.NewParameter("value", smartcontract.IntegerType))
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md = newMethodAndPrice(p.setFeePerByte, 3000000, smartcontract.AllowModifyStates)
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p.AddMethod(md, desc, false)
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desc = newDescriptor("setMaxBlockSystemFee", smartcontract.BoolType,
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manifest.NewParameter("value", smartcontract.IntegerType))
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md = newMethodAndPrice(p.setMaxBlockSystemFee, 3000000, smartcontract.AllowModifyStates)
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p.AddMethod(md, desc, false)
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desc = newDescriptor("blockAccount", smartcontract.BoolType,
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manifest.NewParameter("account", smartcontract.Hash160Type))
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md = newMethodAndPrice(p.blockAccount, 3000000, smartcontract.AllowModifyStates)
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p.AddMethod(md, desc, false)
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desc = newDescriptor("unblockAccount", smartcontract.BoolType,
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manifest.NewParameter("account", smartcontract.Hash160Type))
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md = newMethodAndPrice(p.unblockAccount, 3000000, smartcontract.AllowModifyStates)
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p.AddMethod(md, desc, false)
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desc = newDescriptor("onPersist", smartcontract.VoidType)
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md = newMethodAndPrice(getOnPersistWrapper(p.OnPersist), 0, smartcontract.AllowModifyStates)
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p.AddMethod(md, desc, false)
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desc = newDescriptor("postPersist", smartcontract.VoidType)
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md = newMethodAndPrice(getOnPersistWrapper(postPersistBase), 0, smartcontract.AllowModifyStates)
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p.AddMethod(md, desc, false)
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return p
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}
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// Metadata implements Contract interface.
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func (p *Policy) Metadata() *interop.ContractMD {
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return &p.ContractMD
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}
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// Initialize initializes Policy native contract and implements Contract interface.
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func (p *Policy) Initialize(ic *interop.Context) error {
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p.isValid = true
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p.maxTransactionsPerBlock = defaultMaxTransactionsPerBlock
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p.maxBlockSize = defaultMaxBlockSize
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p.feePerByte = defaultFeePerByte
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p.maxBlockSystemFee = defaultMaxBlockSystemFee
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p.maxVerificationGas = defaultMaxVerificationGas
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p.blockedAccounts = make([]util.Uint160, 0)
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return nil
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}
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// OnPersist implements Contract interface.
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func (p *Policy) OnPersist(ic *interop.Context) error {
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return nil
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}
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// OnPersistEnd updates cached Policy values if they've been changed
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func (p *Policy) OnPersistEnd(dao dao.DAO) error {
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if p.isValid {
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return nil
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}
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p.lock.Lock()
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defer p.lock.Unlock()
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p.maxTransactionsPerBlock = p.getUint32WithKey(dao, maxTransactionsPerBlockKey, defaultMaxTransactionsPerBlock)
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p.maxBlockSize = p.getUint32WithKey(dao, maxBlockSizeKey, defaultMaxBlockSize)
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p.feePerByte = p.getInt64WithKey(dao, feePerByteKey, defaultFeePerByte)
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p.maxBlockSystemFee = p.getInt64WithKey(dao, maxBlockSystemFeeKey, defaultMaxBlockSystemFee)
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p.maxVerificationGas = defaultMaxVerificationGas
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p.blockedAccounts = make([]util.Uint160, 0)
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siMap, err := dao.GetStorageItemsWithPrefix(p.ContractID, []byte{blockedAccountPrefix})
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if err != nil {
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return fmt.Errorf("failed to get blocked accounts from storage: %w", err)
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}
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for key := range siMap {
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hash, err := util.Uint160DecodeBytesBE([]byte(key))
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if err != nil {
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return fmt.Errorf("failed to decode blocked account hash: %w", err)
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}
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p.blockedAccounts = append(p.blockedAccounts, hash)
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}
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sort.Slice(p.blockedAccounts, func(i, j int) bool {
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return p.blockedAccounts[i].Less(p.blockedAccounts[j])
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})
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p.isValid = true
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return nil
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}
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// getMaxTransactionsPerBlock is Policy contract method and returns the upper
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// limit of transactions per block.
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func (p *Policy) getMaxTransactionsPerBlock(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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return stackitem.NewBigInteger(big.NewInt(int64(p.GetMaxTransactionsPerBlockInternal(ic.DAO))))
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}
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// GetMaxTransactionsPerBlockInternal returns the upper limit of transactions per
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// block.
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func (p *Policy) GetMaxTransactionsPerBlockInternal(dao dao.DAO) uint32 {
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p.lock.RLock()
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defer p.lock.RUnlock()
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if p.isValid {
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return p.maxTransactionsPerBlock
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}
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return p.getUint32WithKey(dao, maxTransactionsPerBlockKey, defaultMaxTransactionsPerBlock)
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}
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// getMaxBlockSize is Policy contract method and returns maximum block size.
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func (p *Policy) getMaxBlockSize(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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return stackitem.NewBigInteger(big.NewInt(int64(p.GetMaxBlockSizeInternal(ic.DAO))))
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}
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// GetMaxBlockSizeInternal returns maximum block size.
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func (p *Policy) GetMaxBlockSizeInternal(dao dao.DAO) uint32 {
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p.lock.RLock()
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defer p.lock.RUnlock()
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if p.isValid {
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return p.maxBlockSize
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}
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return p.getUint32WithKey(dao, maxBlockSizeKey, defaultMaxBlockSize)
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}
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// getFeePerByte is Policy contract method and returns required transaction's fee
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// per byte.
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func (p *Policy) getFeePerByte(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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return stackitem.NewBigInteger(big.NewInt(p.GetFeePerByteInternal(ic.DAO)))
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}
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// GetFeePerByteInternal returns required transaction's fee per byte.
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func (p *Policy) GetFeePerByteInternal(dao dao.DAO) int64 {
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p.lock.RLock()
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defer p.lock.RUnlock()
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if p.isValid {
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return p.feePerByte
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}
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return p.getInt64WithKey(dao, feePerByteKey, defaultFeePerByte)
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}
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// GetMaxVerificationGas returns maximum gas allowed to be burned during verificaion.
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func (p *Policy) GetMaxVerificationGas(_ dao.DAO) int64 {
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if p.isValid {
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return p.maxVerificationGas
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}
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return defaultMaxVerificationGas
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}
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// getMaxBlockSystemFee is Policy contract method and returns the maximum overall
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// system fee per block.
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func (p *Policy) getMaxBlockSystemFee(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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return stackitem.NewBigInteger(big.NewInt(p.GetMaxBlockSystemFeeInternal(ic.DAO)))
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}
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// GetMaxBlockSystemFeeInternal the maximum overall system fee per block.
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func (p *Policy) GetMaxBlockSystemFeeInternal(dao dao.DAO) int64 {
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p.lock.RLock()
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defer p.lock.RUnlock()
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if p.isValid {
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return p.maxBlockSystemFee
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}
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return p.getInt64WithKey(dao, maxBlockSystemFeeKey, defaultMaxBlockSystemFee)
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}
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// isBlocked is Policy contract method and checks whether provided account is blocked.
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func (p *Policy) isBlocked(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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hash := toUint160(args[0])
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return stackitem.NewBool(p.IsBlockedInternal(ic.DAO, hash))
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}
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// IsBlockedInternal checks whether provided account is blocked
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func (p *Policy) IsBlockedInternal(dao dao.DAO, hash util.Uint160) bool {
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p.lock.RLock()
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defer p.lock.RUnlock()
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if p.isValid {
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length := len(p.blockedAccounts)
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i := sort.Search(length, func(i int) bool {
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return !p.blockedAccounts[i].Less(hash)
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})
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if length != 0 && i != length && p.blockedAccounts[i].Equals(hash) {
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return true
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}
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return false
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}
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key := append([]byte{blockedAccountPrefix}, hash.BytesBE()...)
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return dao.GetStorageItem(p.ContractID, key) != nil
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}
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// setMaxTransactionsPerBlock is Policy contract method and sets the upper limit
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// of transactions per block.
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func (p *Policy) setMaxTransactionsPerBlock(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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value := uint32(toBigInt(args[0]).Int64())
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if value > block.MaxTransactionsPerBlock {
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panic(fmt.Errorf("MaxTransactionsPerBlock cannot exceed the maximum allowed transactions per block = %d", block.MaxTransactionsPerBlock))
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}
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ok, err := p.checkValidators(ic)
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if err != nil {
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panic(err)
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}
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if !ok {
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return stackitem.NewBool(false)
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}
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p.lock.Lock()
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defer p.lock.Unlock()
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err = p.setUint32WithKey(ic.DAO, maxTransactionsPerBlockKey, value)
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if err != nil {
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panic(err)
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}
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p.isValid = false
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return stackitem.NewBool(true)
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}
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// setMaxBlockSize is Policy contract method and sets maximum block size.
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func (p *Policy) setMaxBlockSize(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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value := uint32(toBigInt(args[0]).Int64())
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if value > payload.MaxSize {
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panic(fmt.Errorf("MaxBlockSize cannot be more than the maximum payload size = %d", payload.MaxSize))
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}
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ok, err := p.checkValidators(ic)
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if err != nil {
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panic(err)
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}
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if !ok {
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return stackitem.NewBool(false)
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}
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p.lock.Lock()
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defer p.lock.Unlock()
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err = p.setUint32WithKey(ic.DAO, maxBlockSizeKey, value)
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if err != nil {
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panic(err)
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}
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p.isValid = false
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return stackitem.NewBool(true)
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}
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// setFeePerByte is Policy contract method and sets transaction's fee per byte.
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func (p *Policy) setFeePerByte(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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value := toBigInt(args[0]).Int64()
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if value < 0 || value > maxFeePerByte {
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panic(fmt.Errorf("FeePerByte shouldn't be negative or greater than %d", maxFeePerByte))
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}
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ok, err := p.checkValidators(ic)
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if err != nil {
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panic(err)
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}
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if !ok {
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return stackitem.NewBool(false)
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}
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p.lock.Lock()
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defer p.lock.Unlock()
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err = p.setInt64WithKey(ic.DAO, feePerByteKey, value)
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if err != nil {
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panic(err)
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}
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p.isValid = false
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return stackitem.NewBool(true)
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}
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// setMaxBlockSystemFee is Policy contract method and sets the maximum system fee per block.
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func (p *Policy) setMaxBlockSystemFee(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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value := toBigInt(args[0]).Int64()
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if value <= minBlockSystemFee {
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panic(fmt.Errorf("MaxBlockSystemFee cannot be less then %d", minBlockSystemFee))
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}
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ok, err := p.checkValidators(ic)
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if err != nil {
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panic(err)
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}
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if !ok {
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return stackitem.NewBool(false)
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}
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p.lock.Lock()
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defer p.lock.Unlock()
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err = p.setInt64WithKey(ic.DAO, maxBlockSystemFeeKey, value)
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if err != nil {
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panic(err)
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}
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p.isValid = false
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return stackitem.NewBool(true)
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}
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// blockAccount is Policy contract method and adds given account hash to the list
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// of blocked accounts.
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func (p *Policy) blockAccount(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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ok, err := p.checkValidators(ic)
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if err != nil {
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panic(err)
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}
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if !ok {
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return stackitem.NewBool(false)
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}
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hash := toUint160(args[0])
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if p.IsBlockedInternal(ic.DAO, hash) {
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return stackitem.NewBool(false)
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}
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key := append([]byte{blockedAccountPrefix}, hash.BytesBE()...)
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p.lock.Lock()
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defer p.lock.Unlock()
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err = ic.DAO.PutStorageItem(p.ContractID, key, &state.StorageItem{
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Value: []byte{0x01},
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})
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if err != nil {
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panic(err)
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}
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p.isValid = false
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return stackitem.NewBool(true)
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}
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// unblockAccount is Policy contract method and removes given account hash from
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// the list of blocked accounts.
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func (p *Policy) unblockAccount(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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ok, err := p.checkValidators(ic)
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if err != nil {
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panic(err)
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}
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if !ok {
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return stackitem.NewBool(false)
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}
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hash := toUint160(args[0])
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if !p.IsBlockedInternal(ic.DAO, hash) {
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return stackitem.NewBool(false)
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}
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key := append([]byte{blockedAccountPrefix}, hash.BytesBE()...)
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p.lock.Lock()
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defer p.lock.Unlock()
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err = ic.DAO.DeleteStorageItem(p.ContractID, key)
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if err != nil {
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panic(err)
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}
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p.isValid = false
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return stackitem.NewBool(true)
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}
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func (p *Policy) getUint32WithKey(dao dao.DAO, key []byte, defaultValue uint32) uint32 {
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si := dao.GetStorageItem(p.ContractID, key)
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if si == nil {
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return defaultValue
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}
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return binary.LittleEndian.Uint32(si.Value)
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}
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func (p *Policy) setUint32WithKey(dao dao.DAO, key []byte, value uint32) error {
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si := &state.StorageItem{
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Value: make([]byte, 4),
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}
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binary.LittleEndian.PutUint32(si.Value, value)
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return dao.PutStorageItem(p.ContractID, key, si)
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}
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func (p *Policy) getInt64WithKey(dao dao.DAO, key []byte, defaultValue int64) int64 {
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si := dao.GetStorageItem(p.ContractID, key)
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if si == nil {
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return defaultValue
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}
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return int64(binary.LittleEndian.Uint64(si.Value))
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}
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func (p *Policy) setInt64WithKey(dao dao.DAO, key []byte, value int64) error {
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si := &state.StorageItem{
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Value: make([]byte, 8),
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}
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binary.LittleEndian.PutUint64(si.Value, uint64(value))
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return dao.PutStorageItem(p.ContractID, key, si)
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}
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func (p *Policy) checkValidators(ic *interop.Context) (bool, error) {
|
|
prevBlock, err := ic.Chain.GetBlock(ic.Block.PrevHash)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
return runtime.CheckHashedWitness(ic, prevBlock.NextConsensus)
|
|
}
|
|
|
|
// CheckPolicy checks whether transaction conforms to current policy restrictions
|
|
// like not being signed by blocked account or not exceeding block-level system
|
|
// fee limit.
|
|
func (p *Policy) CheckPolicy(d dao.DAO, tx *transaction.Transaction) error {
|
|
for _, signer := range tx.Signers {
|
|
if p.IsBlockedInternal(d, signer.Account) {
|
|
return fmt.Errorf("account %s is blocked", signer.Account.StringLE())
|
|
}
|
|
}
|
|
maxBlockSystemFee := p.GetMaxBlockSystemFeeInternal(d)
|
|
if maxBlockSystemFee < tx.SystemFee {
|
|
return fmt.Errorf("transaction's fee can't exceed maximum block system fee %d", maxBlockSystemFee)
|
|
}
|
|
return nil
|
|
}
|