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129 lines
3.7 KiB
Go
129 lines
3.7 KiB
Go
package interop
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import (
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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/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"
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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"
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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/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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"go.uber.org/zap"
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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 crypto.Verifiable
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Natives []Contract
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Trigger trigger.Type
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Block *block.Block
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Tx *transaction.Transaction
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DAO *dao.Cached
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Notifications []state.NotificationEvent
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Log *zap.Logger
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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, natives []Contract, block *block.Block, tx *transaction.Transaction, log *zap.Logger) *Context {
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dao := dao.NewCached(d)
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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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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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}
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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, *vm.VM) error
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Price int
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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 []vm.StackItem) vm.StackItem
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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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Price int64
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RequiredFlags smartcontract.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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}
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// ContractMD represents native contract instance.
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type ContractMD struct {
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Manifest manifest.Manifest
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ServiceName string
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ServiceID uint32
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Script []byte
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Hash util.Uint160
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Methods map[string]MethodAndPrice
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}
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// GetContract returns script of the contract with the specified hash.
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func (ic *Context) GetContract(h util.Uint160) ([]byte, bool) {
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cs, err := ic.DAO.GetContractState(h)
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if err != nil {
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return nil, false
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}
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hasDynamicInvoke := (cs.Properties & smartcontract.HasDynamicInvoke) != 0
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return cs.Script, hasDynamicInvoke
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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) *ContractMD {
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c := &ContractMD{
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ServiceName: name,
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ServiceID: emit.InteropNameToID([]byte(name)),
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Methods: make(map[string]MethodAndPrice),
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}
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w := io.NewBufBinWriter()
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emit.Syscall(w.BinWriter, c.ServiceName)
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c.Script = w.Bytes()
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c.Hash = hash.Hash160(c.Script)
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c.Manifest = *manifest.DefaultManifest(c.Hash)
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return c
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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, safe bool) {
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c.Manifest.ABI.Methods = append(c.Manifest.ABI.Methods, *desc)
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c.Methods[desc.Name] = *md
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if safe {
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c.Manifest.SafeMethods.Add(desc.Name)
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}
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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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