364 lines
12 KiB
Go
364 lines
12 KiB
Go
package native
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import (
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"fmt"
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"math/big"
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"sort"
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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/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/core/transaction"
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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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const (
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policyContractID = -7
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defaultExecFeeFactor = interop.DefaultBaseExecFee
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defaultFeePerByte = 1000
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defaultMaxVerificationGas = 1_50000000
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// DefaultStoragePrice is the price to pay for 1 byte of storage.
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DefaultStoragePrice = 100000
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// maxExecFeeFactor is the maximum allowed execution fee factor.
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maxExecFeeFactor = 100
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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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// maxStoragePrice is the maximum allowed price for a byte of storage.
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maxStoragePrice = 10000000
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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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// execFeeFactorKey is a key used to store execution fee factor.
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execFeeFactorKey = []byte{18}
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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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// storagePriceKey is a key used to store storage price.
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storagePriceKey = []byte{19}
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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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NEO *NEO
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}
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type PolicyCache struct {
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execFeeFactor uint32
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feePerByte int64
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maxVerificationGas int64
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storagePrice uint32
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blockedAccounts []util.Uint160
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}
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var (
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_ interop.Contract = (*Policy)(nil)
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_ storage.NativeContractCache = (*PolicyCache)(nil)
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)
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// Copy implements NativeContractCache interface.
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func (c *PolicyCache) Copy() storage.NativeContractCache {
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cp := &PolicyCache{}
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copyPolicyCache(c, cp)
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return cp
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}
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func copyPolicyCache(src, dst *PolicyCache) {
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*dst = *src
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dst.blockedAccounts = make([]util.Uint160, len(src.blockedAccounts))
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copy(dst.blockedAccounts, src.blockedAccounts)
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}
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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(nativenames.Policy, policyContractID)}
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defer p.UpdateHash()
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desc := newDescriptor("getFeePerByte", smartcontract.IntegerType)
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md := newMethodAndPrice(p.getFeePerByte, 1<<15, callflag.ReadStates)
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p.AddMethod(md, desc)
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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, 1<<15, callflag.ReadStates)
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p.AddMethod(md, desc)
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desc = newDescriptor("getExecFeeFactor", smartcontract.IntegerType)
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md = newMethodAndPrice(p.getExecFeeFactor, 1<<15, callflag.ReadStates)
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p.AddMethod(md, desc)
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desc = newDescriptor("setExecFeeFactor", smartcontract.VoidType,
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manifest.NewParameter("value", smartcontract.IntegerType))
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md = newMethodAndPrice(p.setExecFeeFactor, 1<<15, callflag.States)
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p.AddMethod(md, desc)
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desc = newDescriptor("getStoragePrice", smartcontract.IntegerType)
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md = newMethodAndPrice(p.getStoragePrice, 1<<15, callflag.ReadStates)
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p.AddMethod(md, desc)
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desc = newDescriptor("setStoragePrice", smartcontract.VoidType,
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manifest.NewParameter("value", smartcontract.IntegerType))
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md = newMethodAndPrice(p.setStoragePrice, 1<<15, callflag.States)
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p.AddMethod(md, desc)
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desc = newDescriptor("setFeePerByte", smartcontract.VoidType,
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manifest.NewParameter("value", smartcontract.IntegerType))
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md = newMethodAndPrice(p.setFeePerByte, 1<<15, callflag.States)
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p.AddMethod(md, desc)
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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, 1<<15, callflag.States)
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p.AddMethod(md, desc)
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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, 1<<15, callflag.States)
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p.AddMethod(md, desc)
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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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setIntWithKey(p.ID, ic.DAO, feePerByteKey, defaultFeePerByte)
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setIntWithKey(p.ID, ic.DAO, execFeeFactorKey, defaultExecFeeFactor)
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setIntWithKey(p.ID, ic.DAO, storagePriceKey, DefaultStoragePrice)
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cache := &PolicyCache{
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execFeeFactor: defaultExecFeeFactor,
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feePerByte: defaultFeePerByte,
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maxVerificationGas: defaultMaxVerificationGas,
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storagePrice: DefaultStoragePrice,
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blockedAccounts: make([]util.Uint160, 0),
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}
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ic.DAO.Store.SetCache(p.ID, cache)
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return nil
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}
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func (p *Policy) InitializeCache(d *dao.Simple) error {
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cache := &PolicyCache{}
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err := p.fillCacheFromDAO(cache, d)
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if err != nil {
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return err
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}
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d.Store.SetCache(p.ID, cache)
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return nil
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}
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func (p *Policy) fillCacheFromDAO(cache *PolicyCache, d *dao.Simple) error {
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cache.execFeeFactor = uint32(getIntWithKey(p.ID, d, execFeeFactorKey))
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cache.feePerByte = getIntWithKey(p.ID, d, feePerByteKey)
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cache.maxVerificationGas = defaultMaxVerificationGas
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cache.storagePrice = uint32(getIntWithKey(p.ID, d, storagePriceKey))
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cache.blockedAccounts = make([]util.Uint160, 0)
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var fErr error
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d.Seek(p.ID, storage.SeekRange{Prefix: []byte{blockedAccountPrefix}}, func(k, _ []byte) bool {
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hash, err := util.Uint160DecodeBytesBE(k)
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if err != nil {
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fErr = fmt.Errorf("failed to decode blocked account hash: %w", err)
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return false
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}
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cache.blockedAccounts = append(cache.blockedAccounts, hash)
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return true
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})
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if fErr != nil {
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return fmt.Errorf("failed to initialize blocked accounts: %w", fErr)
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}
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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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// PostPersist implements Contract interface.
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func (p *Policy) PostPersist(ic *interop.Context) error {
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return nil
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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.Simple) int64 {
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cache := dao.Store.GetROCache(p.ID).(*PolicyCache)
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return cache.feePerByte
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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.Simple) int64 {
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cache := dao.Store.GetROCache(p.ID).(*PolicyCache)
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return cache.maxVerificationGas
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}
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func (p *Policy) getExecFeeFactor(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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return stackitem.NewBigInteger(big.NewInt(int64(p.GetExecFeeFactorInternal(ic.DAO))))
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}
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// GetExecFeeFactorInternal returns current execution fee factor.
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func (p *Policy) GetExecFeeFactorInternal(d *dao.Simple) int64 {
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cache := d.Store.GetROCache(p.ID).(*PolicyCache)
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return int64(cache.execFeeFactor)
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}
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func (p *Policy) setExecFeeFactor(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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value := toUint32(args[0])
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if value <= 0 || maxExecFeeFactor < value {
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panic(fmt.Errorf("ExecFeeFactor must be between 0 and %d", maxExecFeeFactor))
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}
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if !p.NEO.checkCommittee(ic) {
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panic("invalid committee signature")
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}
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setIntWithKey(p.ID, ic.DAO, execFeeFactorKey, int64(value))
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cache := ic.DAO.Store.GetRWCache(p.ID).(*PolicyCache)
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cache.execFeeFactor = value
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return stackitem.Null{}
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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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_, blocked := p.isBlockedInternal(ic.DAO, hash)
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return stackitem.NewBool(blocked)
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}
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// IsBlocked checks whether provided account is blocked.
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func (p *Policy) IsBlocked(dao *dao.Simple, hash util.Uint160) bool {
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_, isBlocked := p.isBlockedInternal(dao, hash)
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return isBlocked
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}
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// isBlockedInternal checks whether provided account is blocked. It returns position
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// of the blocked account in the blocked accounts list (or the position it should be
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// put at).
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func (p *Policy) isBlockedInternal(dao *dao.Simple, hash util.Uint160) (int, bool) {
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cache := dao.Store.GetROCache(p.ID).(*PolicyCache)
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length := len(cache.blockedAccounts)
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i := sort.Search(length, func(i int) bool {
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return !cache.blockedAccounts[i].Less(hash)
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})
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if length != 0 && i != length && cache.blockedAccounts[i].Equals(hash) {
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return i, true
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}
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return i, false
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}
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func (p *Policy) getStoragePrice(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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return stackitem.NewBigInteger(big.NewInt(p.GetStoragePriceInternal(ic.DAO)))
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}
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// GetStoragePriceInternal returns current execution fee factor.
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func (p *Policy) GetStoragePriceInternal(d *dao.Simple) int64 {
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cache := d.Store.GetROCache(p.ID).(*PolicyCache)
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return int64(cache.storagePrice)
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}
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func (p *Policy) setStoragePrice(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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value := toUint32(args[0])
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if value <= 0 || maxStoragePrice < value {
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panic(fmt.Errorf("StoragePrice must be between 0 and %d", maxStoragePrice))
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}
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if !p.NEO.checkCommittee(ic) {
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panic("invalid committee signature")
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}
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setIntWithKey(p.ID, ic.DAO, storagePriceKey, int64(value))
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cache := ic.DAO.Store.GetRWCache(p.ID).(*PolicyCache)
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cache.storagePrice = value
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return stackitem.Null{}
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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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if !p.NEO.checkCommittee(ic) {
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panic("invalid committee signature")
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}
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setIntWithKey(p.ID, ic.DAO, feePerByteKey, value)
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cache := ic.DAO.Store.GetRWCache(p.ID).(*PolicyCache)
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cache.feePerByte = value
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return stackitem.Null{}
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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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if !p.NEO.checkCommittee(ic) {
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panic("invalid committee signature")
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}
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hash := toUint160(args[0])
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for i := range ic.Natives {
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if ic.Natives[i].Metadata().Hash == hash {
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panic("cannot block native contract")
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}
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}
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i, blocked := p.isBlockedInternal(ic.DAO, hash)
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if blocked {
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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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ic.DAO.PutStorageItem(p.ID, key, state.StorageItem{})
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cache := ic.DAO.Store.GetRWCache(p.ID).(*PolicyCache)
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if len(cache.blockedAccounts) == i {
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cache.blockedAccounts = append(cache.blockedAccounts, hash)
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} else {
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cache.blockedAccounts = append(cache.blockedAccounts[:i+1], cache.blockedAccounts[i:]...)
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cache.blockedAccounts[i] = hash
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}
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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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if !p.NEO.checkCommittee(ic) {
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panic("invalid committee signature")
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}
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hash := toUint160(args[0])
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i, blocked := p.isBlockedInternal(ic.DAO, hash)
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if !blocked {
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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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ic.DAO.DeleteStorageItem(p.ID, key)
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cache := ic.DAO.Store.GetRWCache(p.ID).(*PolicyCache)
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cache.blockedAccounts = append(cache.blockedAccounts[:i], cache.blockedAccounts[i+1:]...)
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return stackitem.NewBool(true)
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}
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// CheckPolicy checks whether transaction conforms to current policy restrictions
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// like not being signed by blocked account or not exceeding block-level system
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// fee limit.
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func (p *Policy) CheckPolicy(d *dao.Simple, tx *transaction.Transaction) error {
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for _, signer := range tx.Signers {
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if _, isBlocked := p.isBlockedInternal(d, signer.Account); isBlocked {
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return fmt.Errorf("account %s is blocked", signer.Account.StringLE())
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}
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}
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return nil
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}
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