forked from TrueCloudLab/neoneo-go
f9f1fe03b2
1. `System.Contract.CallNative` expects version on stack. 2. Actual method is determined based on current instruction pointer. 3. Native hashes don't longer depend on NEF checksum.
538 lines
18 KiB
Go
538 lines
18 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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"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/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/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/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 = -5
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defaultMaxBlockSize = 1024 * 256
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defaultMaxTransactionsPerBlock = 512
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defaultExecFeeFactor = interop.DefaultBaseExecFee
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defaultFeePerByte = 1000
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defaultMaxVerificationGas = 50000000
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defaultMaxBlockSystemFee = 9000 * GASFactor
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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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// minBlockSystemFee is the minimum allowed system fee per block.
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minBlockSystemFee = 4007600
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// maxExecFeeFactor is the maximum allowed execution fee factor.
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maxExecFeeFactor = 1000
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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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// 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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// 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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// 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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// 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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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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execFeeFactor uint32
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feePerByte int64
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maxBlockSystemFee 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 _ 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(nativenames.Policy, policyContractID)}
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defer p.UpdateHash()
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desc := newDescriptor("getMaxTransactionsPerBlock", smartcontract.IntegerType)
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md := newMethodAndPrice(p.getMaxTransactionsPerBlock, 1000000, callflag.ReadStates)
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p.AddMethod(md, desc)
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desc = newDescriptor("getMaxBlockSize", smartcontract.IntegerType)
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md = newMethodAndPrice(p.getMaxBlockSize, 1000000, callflag.ReadStates)
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p.AddMethod(md, desc)
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desc = newDescriptor("getFeePerByte", smartcontract.IntegerType)
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md = newMethodAndPrice(p.getFeePerByte, 1000000, 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, 1000000, callflag.ReadStates)
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p.AddMethod(md, desc)
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desc = newDescriptor("getMaxBlockSystemFee", smartcontract.IntegerType)
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md = newMethodAndPrice(p.getMaxBlockSystemFee, 1000000, 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, 1000000, 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, 3000000, 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, 1000000, 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, 3000000, callflag.States)
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p.AddMethod(md, desc)
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desc = newDescriptor("setMaxBlockSize", smartcontract.VoidType,
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manifest.NewParameter("value", smartcontract.IntegerType))
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md = newMethodAndPrice(p.setMaxBlockSize, 3000000, callflag.States)
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p.AddMethod(md, desc)
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desc = newDescriptor("setMaxTransactionsPerBlock", smartcontract.VoidType,
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manifest.NewParameter("value", smartcontract.IntegerType))
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md = newMethodAndPrice(p.setMaxTransactionsPerBlock, 3000000, 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, 3000000, callflag.States)
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p.AddMethod(md, desc)
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desc = newDescriptor("setMaxBlockSystemFee", smartcontract.VoidType,
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manifest.NewParameter("value", smartcontract.IntegerType))
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md = newMethodAndPrice(p.setMaxBlockSystemFee, 3000000, 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, 3000000, 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, 3000000, 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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if err := setIntWithKey(p.ID, ic.DAO, maxTransactionsPerBlockKey, defaultMaxTransactionsPerBlock); err != nil {
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return err
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}
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if err := setIntWithKey(p.ID, ic.DAO, feePerByteKey, defaultFeePerByte); err != nil {
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return err
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}
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if err := setIntWithKey(p.ID, ic.DAO, maxBlockSizeKey, defaultMaxBlockSize); err != nil {
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return err
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}
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if err := setIntWithKey(p.ID, ic.DAO, maxBlockSystemFeeKey, defaultMaxBlockSystemFee); err != nil {
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return err
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}
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if err := setIntWithKey(p.ID, ic.DAO, execFeeFactorKey, defaultExecFeeFactor); err != nil {
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return err
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}
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if err := setIntWithKey(p.ID, ic.DAO, storagePriceKey, DefaultStoragePrice); err != nil {
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return err
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}
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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.execFeeFactor = defaultExecFeeFactor
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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.storagePrice = DefaultStoragePrice
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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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// PostPersist implements Contract interface.
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func (p *Policy) PostPersist(ic *interop.Context) error {
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p.lock.Lock()
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defer p.lock.Unlock()
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if p.isValid {
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return nil
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}
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p.maxTransactionsPerBlock = uint32(getIntWithKey(p.ID, ic.DAO, maxTransactionsPerBlockKey))
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p.maxBlockSize = uint32(getIntWithKey(p.ID, ic.DAO, maxBlockSizeKey))
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p.execFeeFactor = uint32(getIntWithKey(p.ID, ic.DAO, execFeeFactorKey))
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p.feePerByte = getIntWithKey(p.ID, ic.DAO, feePerByteKey)
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p.maxBlockSystemFee = getIntWithKey(p.ID, ic.DAO, maxBlockSystemFeeKey)
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p.maxVerificationGas = defaultMaxVerificationGas
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p.storagePrice = uint32(getIntWithKey(p.ID, ic.DAO, storagePriceKey))
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p.blockedAccounts = make([]util.Uint160, 0)
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siMap, err := ic.DAO.GetStorageItemsWithPrefix(p.ID, []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 uint32(getIntWithKey(p.ID, dao, maxTransactionsPerBlockKey))
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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 uint32(getIntWithKey(p.ID, dao, maxBlockSizeKey))
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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 getIntWithKey(p.ID, dao, feePerByteKey)
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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 getIntWithKey(p.ID, dao, maxBlockSystemFeeKey)
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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.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 int64(p.execFeeFactor)
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}
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return getIntWithKey(p.ID, d, execFeeFactorKey)
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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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p.lock.Lock()
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defer p.lock.Unlock()
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err := setIntWithKey(p.ID, ic.DAO, execFeeFactorKey, int64(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.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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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.ID, key) != nil
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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.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 int64(p.storagePrice)
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}
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return getIntWithKey(p.ID, d, storagePriceKey)
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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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p.lock.Lock()
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defer p.lock.Unlock()
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err := setIntWithKey(p.ID, ic.DAO, storagePriceKey, int64(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.Null{}
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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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if !p.NEO.checkCommittee(ic) {
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panic("invalid committee signature")
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}
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p.lock.Lock()
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defer p.lock.Unlock()
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err := setIntWithKey(p.ID, ic.DAO, maxTransactionsPerBlockKey, int64(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.Null{}
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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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if !p.NEO.checkCommittee(ic) {
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panic("invalid committee signature")
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}
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p.lock.Lock()
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defer p.lock.Unlock()
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err := setIntWithKey(p.ID, ic.DAO, maxBlockSizeKey, int64(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.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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p.lock.Lock()
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defer p.lock.Unlock()
|
|
err := setIntWithKey(p.ID, ic.DAO, feePerByteKey, value)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
p.isValid = false
|
|
return stackitem.Null{}
|
|
}
|
|
|
|
// setMaxBlockSystemFee is Policy contract method and sets the maximum system fee per block.
|
|
func (p *Policy) setMaxBlockSystemFee(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
value := toBigInt(args[0]).Int64()
|
|
if value <= minBlockSystemFee {
|
|
panic(fmt.Errorf("MaxBlockSystemFee cannot be less then %d", minBlockSystemFee))
|
|
}
|
|
if !p.NEO.checkCommittee(ic) {
|
|
panic("invalid committee signature")
|
|
}
|
|
p.lock.Lock()
|
|
defer p.lock.Unlock()
|
|
err := setIntWithKey(p.ID, ic.DAO, maxBlockSystemFeeKey, value)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
p.isValid = false
|
|
return stackitem.Null{}
|
|
}
|
|
|
|
// blockAccount is Policy contract method and adds given account hash to the list
|
|
// of blocked accounts.
|
|
func (p *Policy) blockAccount(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
if !p.NEO.checkCommittee(ic) {
|
|
panic("invalid committee signature")
|
|
}
|
|
hash := toUint160(args[0])
|
|
if p.IsBlockedInternal(ic.DAO, hash) {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
key := append([]byte{blockedAccountPrefix}, hash.BytesBE()...)
|
|
p.lock.Lock()
|
|
defer p.lock.Unlock()
|
|
err := ic.DAO.PutStorageItem(p.ID, key, &state.StorageItem{
|
|
Value: []byte{},
|
|
})
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
p.isValid = false
|
|
return stackitem.NewBool(true)
|
|
}
|
|
|
|
// unblockAccount is Policy contract method and removes given account hash from
|
|
// the list of blocked accounts.
|
|
func (p *Policy) unblockAccount(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
if !p.NEO.checkCommittee(ic) {
|
|
panic("invalid committee signature")
|
|
}
|
|
hash := toUint160(args[0])
|
|
if !p.IsBlockedInternal(ic.DAO, hash) {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
key := append([]byte{blockedAccountPrefix}, hash.BytesBE()...)
|
|
p.lock.Lock()
|
|
defer p.lock.Unlock()
|
|
err := ic.DAO.DeleteStorageItem(p.ID, key)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
p.isValid = false
|
|
return stackitem.NewBool(true)
|
|
}
|
|
|
|
// 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
|
|
}
|