mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-27 03:58:06 +00:00
377 lines
11 KiB
Go
377 lines
11 KiB
Go
package native
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import (
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"encoding/json"
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"errors"
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"fmt"
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"math"
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"math/big"
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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/contract"
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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/encoding/bigint"
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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/smartcontract/nef"
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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/stackitem"
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)
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// Management is contract-managing native contract.
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type Management struct {
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interop.ContractMD
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}
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// StoragePrice is the price to pay for 1 byte of storage.
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const StoragePrice = 100000
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const (
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prefixContract = 8
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)
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var errGasLimitExceeded = errors.New("gas limit exceeded")
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var keyNextAvailableID = []byte{15}
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// makeContractKey creates a key from account script hash.
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func makeContractKey(h util.Uint160) []byte {
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return makeUint160Key(prefixContract, h)
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}
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// newManagement creates new Management native contract.
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func newManagement() *Management {
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var m = &Management{ContractMD: *interop.NewContractMD(nativenames.Management)}
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desc := newDescriptor("getContract", smartcontract.ArrayType,
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manifest.NewParameter("hash", smartcontract.Hash160Type))
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md := newMethodAndPrice(m.getContract, 1000000, smartcontract.ReadStates)
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m.AddMethod(md, desc)
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desc = newDescriptor("deploy", smartcontract.ArrayType,
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manifest.NewParameter("script", smartcontract.ByteArrayType),
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manifest.NewParameter("manifest", smartcontract.ByteArrayType))
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md = newMethodAndPrice(m.deploy, 0, smartcontract.WriteStates)
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m.AddMethod(md, desc)
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desc = newDescriptor("update", smartcontract.VoidType,
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manifest.NewParameter("script", smartcontract.ByteArrayType),
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manifest.NewParameter("manifest", smartcontract.ByteArrayType))
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md = newMethodAndPrice(m.update, 0, smartcontract.WriteStates)
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m.AddMethod(md, desc)
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desc = newDescriptor("destroy", smartcontract.VoidType)
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md = newMethodAndPrice(m.destroy, 10000000, smartcontract.WriteStates)
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m.AddMethod(md, desc)
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return m
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}
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// getContract is an implementation of public getContract method, it's run under
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// VM protections, so it's OK for it to panic instead of returning errors.
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func (m *Management) getContract(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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hashBytes, err := args[0].TryBytes()
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if err != nil {
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panic(err)
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}
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hash, err := util.Uint160DecodeBytesBE(hashBytes)
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if err != nil {
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panic(err)
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}
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ctr, err := m.GetContract(ic.DAO, hash)
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if err != nil {
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panic(err)
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}
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return contractToStack(ctr)
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}
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// GetContract returns contract with given hash from given DAO.
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func (m *Management) GetContract(d dao.DAO, hash util.Uint160) (*state.Contract, error) {
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contract := new(state.Contract)
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key := makeContractKey(hash)
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err := getSerializableFromDAO(m.ContractID, d, key, contract)
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if err != nil {
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return nil, err
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}
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return contract, nil
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}
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func getLimitedSlice(arg stackitem.Item, max int) ([]byte, error) {
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_, isNull := arg.(stackitem.Null)
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if isNull {
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return nil, nil
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}
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b, err := arg.TryBytes()
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if err != nil {
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return nil, err
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}
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l := len(b)
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if l == 0 {
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return nil, errors.New("empty")
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} else if l > max {
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return nil, fmt.Errorf("len is %d (max %d)", l, max)
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}
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return b, nil
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}
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// getNefAndManifestFromItems converts input arguments into NEF and manifest
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// adding appropriate deployment GAS price and sanitizing inputs.
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func getNefAndManifestFromItems(args []stackitem.Item, v *vm.VM) (*nef.File, *manifest.Manifest, error) {
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nefBytes, err := getLimitedSlice(args[0], math.MaxInt32) // Upper limits are checked during NEF deserialization.
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if err != nil {
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return nil, nil, fmt.Errorf("invalid NEF file: %w", err)
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}
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manifestBytes, err := getLimitedSlice(args[1], manifest.MaxManifestSize)
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if err != nil {
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return nil, nil, fmt.Errorf("invalid manifest: %w", err)
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}
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if !v.AddGas(int64(StoragePrice * (len(nefBytes) + len(manifestBytes)))) {
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return nil, nil, errGasLimitExceeded
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}
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var resManifest *manifest.Manifest
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var resNef *nef.File
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if nefBytes != nil {
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nf, err := nef.FileFromBytes(nefBytes)
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if err != nil {
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return nil, nil, fmt.Errorf("invalid NEF file: %w", err)
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}
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resNef = &nf
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}
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if manifestBytes != nil {
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resManifest = new(manifest.Manifest)
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err := json.Unmarshal(manifestBytes, resManifest)
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if err != nil {
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return nil, nil, fmt.Errorf("invalid manifest: %w", err)
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}
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}
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return resNef, resManifest, nil
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}
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// deploy is an implementation of public deploy method, it's run under
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// VM protections, so it's OK for it to panic instead of returning errors.
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func (m *Management) deploy(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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neff, manif, err := getNefAndManifestFromItems(args, ic.VM)
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if err != nil {
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panic(err)
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}
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if neff == nil {
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panic(errors.New("no valid NEF provided"))
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}
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if manif == nil {
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panic(errors.New("no valid manifest provided"))
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}
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if ic.Tx == nil {
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panic(errors.New("no transaction provided"))
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}
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newcontract, err := m.Deploy(ic.DAO, ic.Tx.Sender(), neff, manif)
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if err != nil {
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panic(err)
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}
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callDeploy(ic, newcontract, false)
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return contractToStack(newcontract)
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}
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// Deploy creates contract's hash/ID and saves new contract into the given DAO.
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// It doesn't run _deploy method.
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func (m *Management) Deploy(d dao.DAO, sender util.Uint160, neff *nef.File, manif *manifest.Manifest) (*state.Contract, error) {
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h := state.CreateContractHash(sender, neff.Script)
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key := makeContractKey(h)
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si := d.GetStorageItem(m.ContractID, key)
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if si != nil {
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return nil, errors.New("contract already exists")
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}
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id, err := m.getNextContractID(d)
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if err != nil {
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return nil, err
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}
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if !manif.IsValid(h) {
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return nil, errors.New("invalid manifest for this contract")
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}
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newcontract := &state.Contract{
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ID: id,
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Hash: h,
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Script: neff.Script,
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Manifest: *manif,
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}
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err = m.PutContractState(d, newcontract)
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if err != nil {
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return nil, err
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}
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return newcontract, nil
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}
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// update is an implementation of public update method, it's run under
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// VM protections, so it's OK for it to panic instead of returning errors.
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func (m *Management) update(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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neff, manif, err := getNefAndManifestFromItems(args, ic.VM)
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if err != nil {
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panic(err)
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}
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if neff == nil && manif == nil {
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panic(errors.New("both NEF and manifest are nil"))
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}
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contract, err := m.Update(ic.DAO, ic.VM.GetCallingScriptHash(), neff, manif)
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if err != nil {
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panic(err)
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}
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callDeploy(ic, contract, true)
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return stackitem.Null{}
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}
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// Update updates contract's script and/or manifest in the given DAO.
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// It doesn't run _deploy method.
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func (m *Management) Update(d dao.DAO, hash util.Uint160, neff *nef.File, manif *manifest.Manifest) (*state.Contract, error) {
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contract, err := m.GetContract(d, hash)
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if err != nil {
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return nil, errors.New("contract doesn't exist")
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}
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// if NEF was provided, update the contract script
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if neff != nil {
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contract.Script = neff.Script
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}
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// if manifest was provided, update the contract manifest
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if manif != nil {
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contract.Manifest = *manif
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if !contract.Manifest.IsValid(contract.Hash) {
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return nil, errors.New("invalid manifest for this contract")
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}
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}
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contract.UpdateCounter++
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err = m.PutContractState(d, contract)
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if err != nil {
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return nil, err
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}
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return contract, nil
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}
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// destroy is an implementation of destroy update method, it's run under
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// VM protections, so it's OK for it to panic instead of returning errors.
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func (m *Management) destroy(ic *interop.Context, sis []stackitem.Item) stackitem.Item {
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hash := ic.VM.GetCallingScriptHash()
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err := m.Destroy(ic.DAO, hash)
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if err != nil {
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panic(err)
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}
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return stackitem.Null{}
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}
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// Destroy drops given contract from DAO along with its storage.
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func (m *Management) Destroy(d dao.DAO, hash util.Uint160) error {
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contract, err := m.GetContract(d, hash)
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if err != nil {
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return err
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}
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key := makeContractKey(hash)
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err = d.DeleteStorageItem(m.ContractID, key)
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if err != nil {
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return err
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}
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err = d.DeleteContractID(contract.ID)
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if err != nil {
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return err
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}
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siMap, err := d.GetStorageItems(contract.ID)
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if err != nil {
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return err
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}
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for k := range siMap {
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err := d.DeleteStorageItem(contract.ID, []byte(k))
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if err != nil {
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return err
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}
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}
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return nil
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}
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func callDeploy(ic *interop.Context, cs *state.Contract, isUpdate bool) {
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md := cs.Manifest.ABI.GetMethod(manifest.MethodDeploy)
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if md != nil {
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err := contract.CallExInternal(ic, cs, manifest.MethodDeploy,
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[]stackitem.Item{stackitem.NewBool(isUpdate)}, smartcontract.All, vm.EnsureIsEmpty)
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if err != nil {
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panic(err)
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}
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}
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}
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func contractToStack(cs *state.Contract) stackitem.Item {
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si, err := cs.ToStackItem()
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if err != nil {
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panic(fmt.Errorf("contract to stack item: %w", err))
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}
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return si
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}
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// Metadata implements Contract interface.
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func (m *Management) Metadata() *interop.ContractMD {
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return &m.ContractMD
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}
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// OnPersist implements Contract interface.
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func (m *Management) OnPersist(ic *interop.Context) error {
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if ic.Block.Index != 0 { // We're only deploying at 0 at the moment.
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return nil
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}
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for _, native := range ic.Natives {
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md := native.Metadata()
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cs := &state.Contract{
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ID: md.ContractID,
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Hash: md.Hash,
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Script: md.Script,
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Manifest: md.Manifest,
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}
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err := m.PutContractState(ic.DAO, cs)
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if err != nil {
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return err
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}
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if err := native.Initialize(ic); err != nil {
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return fmt.Errorf("initializing %s native contract: %w", md.Name, err)
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}
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}
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return nil
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}
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// PostPersist implements Contract interface.
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func (m *Management) PostPersist(_ *interop.Context) error {
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return nil
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}
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// Initialize implements Contract interface.
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func (m *Management) Initialize(_ *interop.Context) error {
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return nil
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}
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// PutContractState saves given contract state into given DAO.
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func (m *Management) PutContractState(d dao.DAO, cs *state.Contract) error {
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key := makeContractKey(cs.Hash)
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if err := putSerializableToDAO(m.ContractID, d, key, cs); err != nil {
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return err
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}
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if cs.UpdateCounter != 0 { // Update.
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return nil
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}
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return d.PutContractID(cs.ID, cs.Hash)
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}
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func (m *Management) getNextContractID(d dao.DAO) (int32, error) {
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var id = big.NewInt(1)
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si := d.GetStorageItem(m.ContractID, keyNextAvailableID)
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if si != nil {
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id = bigint.FromBytes(si.Value)
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} else {
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si = new(state.StorageItem)
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si.Value = make([]byte, 0, 2)
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}
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ret := int32(id.Int64())
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id.Add(id, big.NewInt(1))
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si.Value = bigint.ToPreallocatedBytes(id, si.Value)
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return ret, d.PutStorageItem(m.ContractID, keyNextAvailableID, si)
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}
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