mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-12-11 05:30:07 +00:00
301 lines
11 KiB
Go
301 lines
11 KiB
Go
/*
|
|
Package management provides an RPC wrapper for the native ContractManagement contract.
|
|
|
|
Safe methods are encapsulated in the ContractReader structure while Contract provides
|
|
various methods to perform state-changing calls.
|
|
*/
|
|
package management
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"encoding/json"
|
|
"fmt"
|
|
"math/big"
|
|
|
|
"github.com/google/uuid"
|
|
"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
|
|
"github.com/nspcc-dev/neo-go/pkg/core/state"
|
|
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
|
|
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
|
|
"github.com/nspcc-dev/neo-go/pkg/rpcclient/unwrap"
|
|
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
|
|
"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
|
|
"github.com/nspcc-dev/neo-go/pkg/smartcontract/nef"
|
|
"github.com/nspcc-dev/neo-go/pkg/util"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
|
|
)
|
|
|
|
// Invoker is used by ContractReader to call various methods.
|
|
type Invoker interface {
|
|
Call(contract util.Uint160, operation string, params ...interface{}) (*result.Invoke, error)
|
|
CallAndExpandIterator(contract util.Uint160, method string, maxItems int, params ...interface{}) (*result.Invoke, error)
|
|
TerminateSession(sessionID uuid.UUID) error
|
|
TraverseIterator(sessionID uuid.UUID, iterator *result.Iterator, num int) ([]stackitem.Item, error)
|
|
}
|
|
|
|
// Actor is used by Contract to create and send transactions.
|
|
type Actor interface {
|
|
Invoker
|
|
|
|
MakeCall(contract util.Uint160, method string, params ...interface{}) (*transaction.Transaction, error)
|
|
MakeRun(script []byte) (*transaction.Transaction, error)
|
|
MakeUnsignedCall(contract util.Uint160, method string, attrs []transaction.Attribute, params ...interface{}) (*transaction.Transaction, error)
|
|
MakeUnsignedRun(script []byte, attrs []transaction.Attribute) (*transaction.Transaction, error)
|
|
SendCall(contract util.Uint160, method string, params ...interface{}) (util.Uint256, uint32, error)
|
|
SendRun(script []byte) (util.Uint256, uint32, error)
|
|
}
|
|
|
|
// ContractReader provides an interface to call read-only ContractManagement
|
|
// contract's methods.
|
|
type ContractReader struct {
|
|
invoker Invoker
|
|
}
|
|
|
|
// Contract represents a ContractManagement contract client that can be used to
|
|
// invoke all of its methods except 'update' and 'destroy' because they can be
|
|
// called successfully only from the contract itself (that is doing an update
|
|
// or self-destruction).
|
|
type Contract struct {
|
|
ContractReader
|
|
|
|
actor Actor
|
|
}
|
|
|
|
// IDHash is an ID/Hash pair returned by the iterator from the GetContractHashes method.
|
|
type IDHash struct {
|
|
ID int32
|
|
Hash util.Uint160
|
|
}
|
|
|
|
// HashesIterator is used for iterating over GetContractHashes results.
|
|
type HashesIterator struct {
|
|
client Invoker
|
|
session uuid.UUID
|
|
iterator result.Iterator
|
|
}
|
|
|
|
// Hash stores the hash of the native ContractManagement contract.
|
|
var Hash = state.CreateNativeContractHash(nativenames.Management)
|
|
|
|
// Event is the event emitted on contract deployment/update/destroy.
|
|
// Even though these events are different they all have the same field inside.
|
|
type Event struct {
|
|
Hash util.Uint160
|
|
}
|
|
|
|
const setMinFeeMethod = "setMinimumDeploymentFee"
|
|
|
|
// NewReader creates an instance of ContractReader that can be used to read
|
|
// data from the contract.
|
|
func NewReader(invoker Invoker) *ContractReader {
|
|
return &ContractReader{invoker}
|
|
}
|
|
|
|
// New creates an instance of Contract to perform actions using
|
|
// the given Actor.
|
|
func New(actor Actor) *Contract {
|
|
return &Contract{*NewReader(actor), actor}
|
|
}
|
|
|
|
// GetContract allows to get contract data from its hash. This method is mostly
|
|
// useful for historic invocations since for current contracts there is a direct
|
|
// getcontractstate RPC API that has more options and works faster than going
|
|
// via contract invocation.
|
|
func (c *ContractReader) GetContract(hash util.Uint160) (*state.Contract, error) {
|
|
return unwrapContract(c.invoker.Call(Hash, "getContract", hash))
|
|
}
|
|
|
|
// GetContractByID allows to get contract data from its ID.
|
|
func (c *ContractReader) GetContractByID(id int32) (*state.Contract, error) {
|
|
return unwrapContract(c.invoker.Call(Hash, "getContractById", id))
|
|
}
|
|
|
|
func unwrapContract(r *result.Invoke, err error) (*state.Contract, error) {
|
|
itm, err := unwrap.Item(r, err)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
res := new(state.Contract)
|
|
err = res.FromStackItem(itm)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return res, nil
|
|
}
|
|
|
|
// GetContractHashes returns an iterator that allows to retrieve all ID-hash
|
|
// mappings for non-native contracts. It depends on the server to provide proper
|
|
// session-based iterator, but can also work with expanded one.
|
|
func (c *ContractReader) GetContractHashes() (*HashesIterator, error) {
|
|
sess, iter, err := unwrap.SessionIterator(c.invoker.Call(Hash, "getContractHashes"))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &HashesIterator{
|
|
client: c.invoker,
|
|
iterator: iter,
|
|
session: sess,
|
|
}, nil
|
|
}
|
|
|
|
// GetContractHashesExpanded is similar to GetContractHashes (uses the same
|
|
// contract method), but can be useful if the server used doesn't support
|
|
// sessions and doesn't expand iterators. It creates a script that will get num
|
|
// of result items from the iterator right in the VM and return them to you. It's
|
|
// only limited by VM stack and GAS available for RPC invocations.
|
|
func (c *ContractReader) GetContractHashesExpanded(num int) ([]IDHash, error) {
|
|
arr, err := unwrap.Array(c.invoker.CallAndExpandIterator(Hash, "getContractHashes", num))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return itemsToIDHashes(arr)
|
|
}
|
|
|
|
// Next returns the next set of elements from the iterator (up to num of them).
|
|
// It can return less than num elements in case iterator doesn't have that many
|
|
// or zero elements if the iterator has no more elements or the session is
|
|
// expired.
|
|
func (h *HashesIterator) Next(num int) ([]IDHash, error) {
|
|
items, err := h.client.TraverseIterator(h.session, &h.iterator, num)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return itemsToIDHashes(items)
|
|
}
|
|
|
|
// Terminate closes the iterator session used by HashesIterator (if it's
|
|
// session-based).
|
|
func (h *HashesIterator) Terminate() error {
|
|
if h.iterator.ID == nil {
|
|
return nil
|
|
}
|
|
return h.client.TerminateSession(h.session)
|
|
}
|
|
|
|
func itemsToIDHashes(arr []stackitem.Item) ([]IDHash, error) {
|
|
res := make([]IDHash, len(arr))
|
|
for i, itm := range arr {
|
|
str, ok := itm.Value().([]stackitem.Item)
|
|
if !ok {
|
|
return nil, fmt.Errorf("item #%d is not a structure %T", i, itm.Value())
|
|
}
|
|
if len(str) != 2 {
|
|
return nil, fmt.Errorf("item #%d has wrong length", i)
|
|
}
|
|
bi, err := str[0].TryBytes()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("item #%d has wrong ID: %w", i, err)
|
|
}
|
|
if len(bi) != 4 {
|
|
return nil, fmt.Errorf("item #%d has wrong ID: bad length", i)
|
|
}
|
|
id := int32(binary.BigEndian.Uint32(bi))
|
|
hb, err := str[1].TryBytes()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("item #%d has wrong hash: %w", i, err)
|
|
}
|
|
u160, err := util.Uint160DecodeBytesBE(hb)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("item #%d has wrong hash: %w", i, err)
|
|
}
|
|
res[i].ID = id
|
|
res[i].Hash = u160
|
|
}
|
|
return res, nil
|
|
}
|
|
|
|
// GetMinimumDeploymentFee returns the minimal amount of GAS needed to deploy a
|
|
// contract on the network.
|
|
func (c *ContractReader) GetMinimumDeploymentFee() (*big.Int, error) {
|
|
return unwrap.BigInt(c.invoker.Call(Hash, "getMinimumDeploymentFee"))
|
|
}
|
|
|
|
// HasMethod checks if the contract specified has a method with the given name
|
|
// and number of parameters.
|
|
func (c *ContractReader) HasMethod(hash util.Uint160, method string, pcount int) (bool, error) {
|
|
return unwrap.Bool(c.invoker.Call(Hash, "hasMethod", hash, method, pcount))
|
|
}
|
|
|
|
// Deploy creates and sends to the network a transaction that deploys the given
|
|
// contract (with the manifest provided), if data is not nil then it also added
|
|
// to the invocation and will be used for "_deploy" method invocation done by
|
|
// the ContractManagement contract. If successful, this method returns deployed
|
|
// contract state that can be retrieved from the stack after execution.
|
|
func (c *Contract) Deploy(exe *nef.File, manif *manifest.Manifest, data interface{}) (util.Uint256, uint32, error) {
|
|
script, err := mkDeployScript(exe, manif, data)
|
|
if err != nil {
|
|
return util.Uint256{}, 0, err
|
|
}
|
|
return c.actor.SendRun(script)
|
|
}
|
|
|
|
// DeployTransaction creates and returns a transaction that deploys the given
|
|
// contract (with the manifest provided), if data is not nil then it also added
|
|
// to the invocation and will be used for "_deploy" method invocation done by
|
|
// the ContractManagement contract. If successful, this method returns deployed
|
|
// contract state that can be retrieved from the stack after execution.
|
|
func (c *Contract) DeployTransaction(exe *nef.File, manif *manifest.Manifest, data interface{}) (*transaction.Transaction, error) {
|
|
script, err := mkDeployScript(exe, manif, data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return c.actor.MakeRun(script)
|
|
}
|
|
|
|
// DeployUnsigned creates and returns an unsigned transaction that deploys the given
|
|
// contract (with the manifest provided), if data is not nil then it also added
|
|
// to the invocation and will be used for "_deploy" method invocation done by
|
|
// the ContractManagement contract. If successful, this method returns deployed
|
|
// contract state that can be retrieved from the stack after execution.
|
|
func (c *Contract) DeployUnsigned(exe *nef.File, manif *manifest.Manifest, data interface{}) (*transaction.Transaction, error) {
|
|
script, err := mkDeployScript(exe, manif, data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return c.actor.MakeUnsignedRun(script, nil)
|
|
}
|
|
|
|
func mkDeployScript(exe *nef.File, manif *manifest.Manifest, data interface{}) ([]byte, error) {
|
|
exeB, err := exe.Bytes()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("bad NEF: %w", err)
|
|
}
|
|
manifB, err := json.Marshal(manif)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("bad manifest: %w", err)
|
|
}
|
|
if data != nil {
|
|
return smartcontract.CreateCallScript(Hash, "deploy", exeB, manifB, data)
|
|
}
|
|
return smartcontract.CreateCallScript(Hash, "deploy", exeB, manifB)
|
|
}
|
|
|
|
// SetMinimumDeploymentFee creates and sends a transaction that changes the
|
|
// minimum GAS amount required to deploy a contract. This method can be called
|
|
// successfully only by the network's committee, so make sure you're using an
|
|
// appropriate Actor. This invocation returns nothing and is successful when
|
|
// transactions ends up in the HALT state.
|
|
func (c *Contract) SetMinimumDeploymentFee(value *big.Int) (util.Uint256, uint32, error) {
|
|
return c.actor.SendCall(Hash, setMinFeeMethod, value)
|
|
}
|
|
|
|
// SetMinimumDeploymentFeeTransaction creates a transaction that changes the
|
|
// minimum GAS amount required to deploy a contract. This method can be called
|
|
// successfully only by the network's committee, so make sure you're using an
|
|
// appropriate Actor. This invocation returns nothing and is successful when
|
|
// transactions ends up in the HALT state. The transaction returned is signed,
|
|
// but not sent to the network.
|
|
func (c *Contract) SetMinimumDeploymentFeeTransaction(value *big.Int) (*transaction.Transaction, error) {
|
|
return c.actor.MakeCall(Hash, setMinFeeMethod, value)
|
|
}
|
|
|
|
// SetMinimumDeploymentFeeUnsigned creates a transaction that changes the
|
|
// minimum GAS amount required to deploy a contract. This method can be called
|
|
// successfully only by the network's committee, so make sure you're using an
|
|
// appropriate Actor. This invocation returns nothing and is successful when
|
|
// transactions ends up in the HALT state. The transaction returned is not
|
|
// signed.
|
|
func (c *Contract) SetMinimumDeploymentFeeUnsigned(value *big.Int) (*transaction.Transaction, error) {
|
|
return c.actor.MakeUnsignedCall(Hash, setMinFeeMethod, nil, value)
|
|
}
|