neoneo-go/pkg/core/interop/context.go

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package interop
import (
"github.com/nspcc-dev/neo-go/pkg/core/block"
"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
"github.com/nspcc-dev/neo-go/pkg/core/dao"
"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/crypto"
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
"github.com/nspcc-dev/neo-go/pkg/io"
"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/trigger"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm"
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
"go.uber.org/zap"
)
// Context represents context in which interops are executed.
type Context struct {
Chain blockchainer.Blockchainer
Container crypto.Verifiable
Natives []Contract
Trigger trigger.Type
Block *block.Block
Tx *transaction.Transaction
DAO *dao.Cached
Notifications []state.NotificationEvent
Log *zap.Logger
}
// NewContext returns new interop context.
func NewContext(trigger trigger.Type, bc blockchainer.Blockchainer, d dao.DAO, natives []Contract, block *block.Block, tx *transaction.Transaction, log *zap.Logger) *Context {
dao := dao.NewCached(d)
nes := make([]state.NotificationEvent, 0)
return &Context{
Chain: bc,
Natives: natives,
Trigger: trigger,
Block: block,
Tx: tx,
DAO: dao,
Notifications: nes,
Log: log,
}
}
// Function binds function name, id with the function itself and price,
// it's supposed to be inited once for all interopContexts, so it doesn't use
// vm.InteropFuncPrice directly.
type Function struct {
ID uint32
Name string
Func func(*Context, *vm.VM) error
Price int
}
// Method is a signature for a native method.
type Method = func(ic *Context, args []vm.StackItem) vm.StackItem
// MethodAndPrice is a native-contract method descriptor.
type MethodAndPrice struct {
Func Method
Price int64
RequiredFlags smartcontract.CallFlag
}
// Contract is an interface for all native contracts.
type Contract interface {
Initialize(*Context) error
Metadata() *ContractMD
OnPersist(*Context) error
}
// ContractMD represents native contract instance.
type ContractMD struct {
Manifest manifest.Manifest
ServiceName string
ServiceID uint32
Script []byte
Hash util.Uint160
Methods map[string]MethodAndPrice
}
// GetContract returns script of the contract with the specified hash.
func (ic *Context) GetContract(h util.Uint160) ([]byte, bool) {
cs, err := ic.DAO.GetContractState(h)
if err != nil {
return nil, false
}
hasDynamicInvoke := (cs.Properties & smartcontract.HasDynamicInvoke) != 0
return cs.Script, hasDynamicInvoke
}
// NewContractMD returns Contract with the specified list of methods.
func NewContractMD(name string) *ContractMD {
c := &ContractMD{
ServiceName: name,
ServiceID: emit.InteropNameToID([]byte(name)),
Methods: make(map[string]MethodAndPrice),
}
w := io.NewBufBinWriter()
emit.Syscall(w.BinWriter, c.ServiceName)
c.Script = w.Bytes()
c.Hash = hash.Hash160(c.Script)
c.Manifest = *manifest.DefaultManifest(c.Hash)
return c
}
// AddMethod adds new method to a native contract.
func (c *ContractMD) AddMethod(md *MethodAndPrice, desc *manifest.Method, safe bool) {
c.Manifest.ABI.Methods = append(c.Manifest.ABI.Methods, *desc)
c.Methods[desc.Name] = *md
if safe {
c.Manifest.SafeMethods.Add(desc.Name)
}
}
// AddEvent adds new event to a native contract.
func (c *ContractMD) AddEvent(name string, ps ...manifest.Parameter) {
c.Manifest.ABI.Events = append(c.Manifest.ABI.Events, manifest.Event{
Name: name,
Parameters: ps,
})
}