interop

package
v0.103.0 Latest Latest
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 Go to latest Published: Oct 20, 2023 License: MIT Imports: 26 Imported by: 0

Documentation

Overview

Package interop contains implementations of Neo interop functions.

This is not the package you use from smart contracts, refer to pkg/interop for that.

Index

Constants

View Source 
const (
	// DefaultBaseExecFee specifies the default multiplier for opcode and syscall prices.
	DefaultBaseExecFee = 30
)

Variables

This section is empty.

Functions

func Sort added in v0.91.0 

func Sort(fs []Function)

Sort sorts interop functions by id.

Types

type Context 

type Context struct {
	Chain         Ledger
	Container     hash.Hashable
	Network       uint32
	Hardforks     map[string]uint32
	Natives       []Contract
	Trigger       trigger.Type
	Block         *block.Block
	NonceData     [16]byte
	Tx            *transaction.Transaction
	DAO           *dao.Simple
	Notifications []state.NotificationEvent
	Log           *zap.Logger
	VM            *vm.VM
	Functions     []Function
	Invocations   map[util.Uint160]int

	GetRandomCounter uint32
	// contains filtered or unexported fields
}

Context represents context in which interops are executed.

func NewContext 

func NewContext(trigger trigger.Type, bc Ledger, d *dao.Simple, baseExecFee, baseStorageFee int64,
	getContract func(*dao.Simple, util.Uint160) (*state.Contract, error), natives []Contract,
	loadTokenFunc func(ic *Context, id int32) error,
	block *block.Block, tx *transaction.Transaction, log *zap.Logger) *Context

NewContext returns new interop context.

func (*Context) AddNotification added in v0.99.0 

func (ic *Context) AddNotification(hash util.Uint160, name string, item *stackitem.Array)

AddNotification creates notification event and appends it to the notification list.

func (*Context) BaseExecFee added in v0.92.0 

func (ic *Context) BaseExecFee() int64

BaseExecFee represents factor to multiply syscall prices with.

func (*Context) BaseStorageFee added in v0.99.0 

func (ic *Context) BaseStorageFee() int64

BaseStorageFee represents price for storing one byte of data in the contract storage.

func (*Context) BlockHeight added in v0.99.0 

func (ic *Context) BlockHeight() uint32

BlockHeight returns current block height got from Context's block if it's set.

func (*Context) CurrentBlockHash added in v0.99.0 

func (ic *Context) CurrentBlockHash() util.Uint256

CurrentBlockHash returns current block hash got from Context's block if it's set.

func (*Context) Exec added in v0.98.0 

func (ic *Context) Exec() error

Exec executes loaded VM script and calls registered finalizers to release the occupied resources.

func (*Context) Finalize added in v0.98.0 

func (ic *Context) Finalize()

Finalize calls all registered cancel functions to release the occupied resources.

func (*Context) GetBlock added in v0.99.0 

func (ic *Context) GetBlock(hash util.Uint256) (*block.Block, error)

GetBlock returns block if it exists and available at the current Context's height.

func (*Context) GetContract added in v0.92.0 

func (ic *Context) GetContract(hash util.Uint160) (*state.Contract, error)

GetContract returns a contract by its hash in the current interop context.

func (*Context) GetFunction added in v0.91.0 

func (ic *Context) GetFunction(id uint32) *Function

GetFunction returns metadata for interop with the specified id.

func (*Context) GetPrice added in v0.93.0 

func (ic *Context) GetPrice(op opcode.Opcode, parameter []byte) int64

GetPrice returns a price for executing op with the provided parameter.

func (*Context) InitNonceData added in v0.96.0 

func (ic *Context) InitNonceData()

InitNonceData initializes nonce to be used in `GetRandom` calculations.

func (*Context) IsHardforkEnabled added in v0.99.0 

func (ic *Context) IsHardforkEnabled(hf config.Hardfork) bool

IsHardforkEnabled tells whether specified hard-fork enabled at the current context height.

func (*Context) LoadToken added in v0.99.1 

func (ic *Context) LoadToken(id int32) error

LoadToken wraps externally provided load-token loading function providing it with context, this function can then be easily used by VM.

func (*Context) RegisterCancelFunc added in v0.98.0 

func (ic *Context) RegisterCancelFunc(f context.CancelFunc)

RegisterCancelFunc adds the given function to the list of functions to be called after the VM finishes script execution.

func (*Context) ReuseVM added in v0.99.1 

func (ic *Context) ReuseVM(v *vm.VM)

ReuseVM resets given VM and allows to reuse it in the current context.

func (*Context) Signers added in v0.98.0 

func (ic *Context) Signers() []transaction.Signer

Signers returns signers witnessing the current execution context.

func (*Context) SpawnVM added in v0.91.0 

func (ic *Context) SpawnVM() *vm.VM

SpawnVM spawns a new VM with the specified gas limit and set context.VM field.

func (*Context) SyscallHandler added in v0.91.0 

func (ic *Context) SyscallHandler(_ *vm.VM, id uint32) error

SyscallHandler handles syscall with id.

func (*Context) UseSigners added in v0.98.0 

func (ic *Context) UseSigners(s []transaction.Signer)

UseSigners allows overriding signers used in this context.

type Contract 

type Contract interface {
	Initialize(*Context) error
	// InitializeCache aimed to initialize contract's cache when the contract has
	// been deployed, but in-memory cached data were lost due to the node reset.
	// It should be called each time after node restart iff the contract was
	// deployed and no Initialize method was called.
	InitializeCache(blockHeight uint32, d *dao.Simple) error
	Metadata() *ContractMD
	OnPersist(*Context) error
	PostPersist(*Context) error
}

Contract is an interface for all native contracts.

type ContractMD 

type ContractMD struct {
	state.NativeContract
	Name    string
	Methods []MethodAndPrice
}

ContractMD represents a native contract instance.

func NewContractMD 

func NewContractMD(name string, id int32) *ContractMD

NewContractMD returns Contract with the specified list of methods.

func (*ContractMD) AddEvent 

func (c *ContractMD) AddEvent(name string, ps ...manifest.Parameter)

AddEvent adds a new event to the native contract.

func (*ContractMD) AddMethod 

func (c *ContractMD) AddMethod(md *MethodAndPrice, desc *manifest.Method)

AddMethod adds a new method to a native contract.

func (*ContractMD) GetMethod added in v0.93.0 

func (c *ContractMD) GetMethod(name string, paramCount int) (MethodAndPrice, bool)

GetMethod returns method `name` with the specified number of parameters.

func (*ContractMD) GetMethodByOffset added in v0.94.0 

func (c *ContractMD) GetMethodByOffset(offset int) (MethodAndPrice, bool)

GetMethodByOffset returns method with the provided offset. Offset is offset of `System.Contract.CallNative` syscall.

func (*ContractMD) IsActive added in v0.94.0 

func (c *ContractMD) IsActive(height uint32) bool

IsActive returns true if the contract was deployed by the specified height.

func (*ContractMD) UpdateHash added in v0.94.0 

func (c *ContractMD) UpdateHash()

UpdateHash creates a native contract script and updates hash.

type Function 

type Function struct {
	ID   uint32
	Name string
	Func func(*Context) error
	// ParamCount is a number of function parameters.
	ParamCount int
	Price      int64
	// RequiredFlags is a set of flags which must be set during script invocations.
	// Default value is NoneFlag i.e. no flags are required.
	RequiredFlags callflag.CallFlag
}

Function binds function name, id with the function itself and the price, it's supposed to be inited once for all interopContexts, so it doesn't use vm.InteropFuncPrice directly.

type Ledger added in v0.98.1 

type Ledger interface {
	BlockHeight() uint32
	CurrentBlockHash() util.Uint256
	GetBlock(hash util.Uint256) (*block.Block, error)
	GetConfig() config.Blockchain
	GetHeaderHash(uint32) util.Uint256
}

Ledger is the interface to Blockchain required for Context functionality.

type Method 

type Method = func(ic *Context, args []stackitem.Item) stackitem.Item

Method is a signature for a native method.

type MethodAndPrice 

type MethodAndPrice struct {
	Func          Method
	MD            *manifest.Method
	CPUFee        int64
	StorageFee    int64
	SyscallOffset int
	RequiredFlags callflag.CallFlag
}

MethodAndPrice is a native-contract method descriptor.

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