286 lines
8.5 KiB
Go
286 lines
8.5 KiB
Go
package interop
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"sort"
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"strings"
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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/blockchainer"
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"github.com/nspcc-dev/neo-go/pkg/core/dao"
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"github.com/nspcc-dev/neo-go/pkg/core/interop/interopnames"
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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/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/io"
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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/smartcontract/nef"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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"go.uber.org/zap"
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)
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const (
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// DefaultBaseExecFee specifies default multiplier for opcode and syscall prices.
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DefaultBaseExecFee = 30
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)
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// Context represents context in which interops are executed.
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type Context struct {
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Chain blockchainer.Blockchainer
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Container hash.Hashable
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Network uint32
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Natives []Contract
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Trigger trigger.Type
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Block *block.Block
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NonceData [16]byte
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Tx *transaction.Transaction
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DAO dao.DAO
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Notifications []state.NotificationEvent
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Log *zap.Logger
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VM *vm.VM
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Functions []Function
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getContract func(dao.DAO, util.Uint160) (*state.Contract, error)
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}
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// NewContext returns new interop context.
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func NewContext(trigger trigger.Type, bc blockchainer.Blockchainer, d dao.DAO,
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getContract func(dao.DAO, util.Uint160) (*state.Contract, error), natives []Contract,
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block *block.Block, tx *transaction.Transaction, log *zap.Logger) *Context {
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dao := d.GetWrapped()
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nes := make([]state.NotificationEvent, 0)
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return &Context{
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Chain: bc,
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Network: uint32(bc.GetConfig().Magic),
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Natives: natives,
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Trigger: trigger,
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Block: block,
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Tx: tx,
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DAO: dao,
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Notifications: nes,
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Log: log,
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// Functions is a slice of interops sorted by ID.
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Functions: []Function{},
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getContract: getContract,
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}
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}
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// InitNonceData initializes nonce to be used in `GetRandom` calculations.
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func (ic *Context) InitNonceData() {
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if tx, ok := ic.Container.(*transaction.Transaction); ok {
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copy(ic.NonceData[:], tx.Hash().BytesBE())
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}
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if ic.Block != nil {
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nonce := ic.Block.Nonce
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nonce ^= binary.LittleEndian.Uint64(ic.NonceData[:])
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binary.LittleEndian.PutUint64(ic.NonceData[:], nonce)
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}
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}
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// Function binds function name, id with the function itself and price,
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// it's supposed to be inited once for all interopContexts, so it doesn't use
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// vm.InteropFuncPrice directly.
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type Function struct {
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ID uint32
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Name string
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Func func(*Context) error
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// ParamCount is a number of function parameters.
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ParamCount int
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Price int64
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// RequiredFlags is a set of flags which must be set during script invocations.
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// Default value is NoneFlag i.e. no flags are required.
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RequiredFlags callflag.CallFlag
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}
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// Method is a signature for a native method.
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type Method = func(ic *Context, args []stackitem.Item) stackitem.Item
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// MethodAndPrice is a native-contract method descriptor.
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type MethodAndPrice struct {
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Func Method
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MD *manifest.Method
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CPUFee int64
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StorageFee int64
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SyscallOffset int
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RequiredFlags callflag.CallFlag
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}
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// Contract is an interface for all native contracts.
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type Contract interface {
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Initialize(*Context) error
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Metadata() *ContractMD
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OnPersist(*Context) error
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PostPersist(*Context) error
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}
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// ContractMD represents native contract instance.
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type ContractMD struct {
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state.NativeContract
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Name string
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Methods []MethodAndPrice
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}
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// NewContractMD returns Contract with the specified list of methods.
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func NewContractMD(name string, id int32) *ContractMD {
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c := &ContractMD{Name: name}
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c.ID = id
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// NEF is now stored in contract state and affects state dump.
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// Therefore values are taken from C# node.
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c.NEF.Header.Compiler = "neo-core-v3.0"
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c.NEF.Header.Magic = nef.Magic
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c.Hash = state.CreateContractHash(util.Uint160{}, 0, c.Name)
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c.Manifest = *manifest.DefaultManifest(name)
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return c
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}
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// UpdateHash creates native contract script and updates hash.
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func (c *ContractMD) UpdateHash() {
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w := io.NewBufBinWriter()
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for i := range c.Methods {
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offset := w.Len()
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c.Methods[i].MD.Offset = offset
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c.Manifest.ABI.Methods[i].Offset = offset
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emit.Int(w.BinWriter, 0)
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c.Methods[i].SyscallOffset = w.Len()
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emit.Syscall(w.BinWriter, interopnames.SystemContractCallNative)
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emit.Opcodes(w.BinWriter, opcode.RET)
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}
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if w.Err != nil {
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panic(fmt.Errorf("can't create native contract script: %w", w.Err))
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}
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c.NEF.Script = w.Bytes()
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c.NEF.Checksum = c.NEF.CalculateChecksum()
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}
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// AddMethod adds new method to a native contract.
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func (c *ContractMD) AddMethod(md *MethodAndPrice, desc *manifest.Method) {
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md.MD = desc
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desc.Safe = md.RequiredFlags&(callflag.All^callflag.ReadOnly) == 0
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index := sort.Search(len(c.Manifest.ABI.Methods), func(i int) bool {
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md := c.Manifest.ABI.Methods[i]
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if md.Name != desc.Name {
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return md.Name >= desc.Name
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}
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return len(md.Parameters) > len(desc.Parameters)
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})
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c.Manifest.ABI.Methods = append(c.Manifest.ABI.Methods, manifest.Method{})
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copy(c.Manifest.ABI.Methods[index+1:], c.Manifest.ABI.Methods[index:])
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c.Manifest.ABI.Methods[index] = *desc
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// Cache follows the same order.
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c.Methods = append(c.Methods, MethodAndPrice{})
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copy(c.Methods[index+1:], c.Methods[index:])
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c.Methods[index] = *md
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}
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// GetMethodByOffset returns with the provided offset.
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// Offset is offset of `System.Contract.CallNative` syscall.
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func (c *ContractMD) GetMethodByOffset(offset int) (MethodAndPrice, bool) {
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for k := range c.Methods {
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if c.Methods[k].SyscallOffset == offset {
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return c.Methods[k], true
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}
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}
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return MethodAndPrice{}, false
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}
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// GetMethod returns method `name` with specified number of parameters.
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func (c *ContractMD) GetMethod(name string, paramCount int) (MethodAndPrice, bool) {
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index := sort.Search(len(c.Methods), func(i int) bool {
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md := c.Methods[i]
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res := strings.Compare(name, md.MD.Name)
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switch res {
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case -1, 1:
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return res == -1
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default:
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return paramCount <= len(md.MD.Parameters)
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}
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})
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if index < len(c.Methods) {
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md := c.Methods[index]
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if md.MD.Name == name && (paramCount == -1 || len(md.MD.Parameters) == paramCount) {
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return md, true
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}
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}
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return MethodAndPrice{}, false
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}
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// AddEvent adds new event to a native contract.
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func (c *ContractMD) AddEvent(name string, ps ...manifest.Parameter) {
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c.Manifest.ABI.Events = append(c.Manifest.ABI.Events, manifest.Event{
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Name: name,
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Parameters: ps,
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})
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}
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// IsActive returns true iff the contract was deployed by the specified height.
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func (c *ContractMD) IsActive(height uint32) bool {
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history := c.UpdateHistory
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return len(history) != 0 && history[0] <= height
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}
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// Sort sorts interop functions by id.
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func Sort(fs []Function) {
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sort.Slice(fs, func(i, j int) bool { return fs[i].ID < fs[j].ID })
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}
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// GetContract returns contract by its hash in current interop context.
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func (ic *Context) GetContract(hash util.Uint160) (*state.Contract, error) {
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return ic.getContract(ic.DAO, hash)
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}
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// GetFunction returns metadata for interop with the specified id.
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func (ic *Context) GetFunction(id uint32) *Function {
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n := sort.Search(len(ic.Functions), func(i int) bool {
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return ic.Functions[i].ID >= id
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})
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if n < len(ic.Functions) && ic.Functions[n].ID == id {
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return &ic.Functions[n]
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}
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return nil
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}
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// BaseExecFee represents factor to multiply syscall prices with.
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func (ic *Context) BaseExecFee() int64 {
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if ic.Chain == nil || (ic.Block != nil && ic.Block.Index == 0) {
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return DefaultBaseExecFee
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}
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return ic.Chain.GetPolicer().GetBaseExecFee()
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}
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// SyscallHandler handles syscall with id.
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func (ic *Context) SyscallHandler(_ *vm.VM, id uint32) error {
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f := ic.GetFunction(id)
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if f == nil {
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return errors.New("syscall not found")
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}
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cf := ic.VM.Context().GetCallFlags()
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if !cf.Has(f.RequiredFlags) {
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return fmt.Errorf("missing call flags: %05b vs %05b", cf, f.RequiredFlags)
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}
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if !ic.VM.AddGas(f.Price * ic.BaseExecFee()) {
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return errors.New("insufficient amount of gas")
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}
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return f.Func(ic)
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}
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// SpawnVM spawns new VM with the specified gas limit and set context.VM field.
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func (ic *Context) SpawnVM() *vm.VM {
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v := vm.NewWithTrigger(ic.Trigger)
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v.GasLimit = -1
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v.SyscallHandler = ic.SyscallHandler
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ic.VM = v
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return v
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}
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