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native_service.go
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native_service.go
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/*
* Copyright (C) 2018 The DNA Authors
* This file is part of The DNA library.
*
* The DNA is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The DNA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The DNA. If not, see <http://www.gnu.org/licenses/>.
*/
package native
import (
"fmt"
"github.com/dnaproject2/DNA/common"
"github.com/dnaproject2/DNA/core/types"
"github.com/dnaproject2/DNA/errors"
"github.com/dnaproject2/DNA/smartcontract/context"
"github.com/dnaproject2/DNA/smartcontract/event"
"github.com/dnaproject2/DNA/smartcontract/states"
sstates "github.com/dnaproject2/DNA/smartcontract/states"
"github.com/dnaproject2/DNA/smartcontract/storage"
)
type (
Handler func(native *NativeService) ([]byte, error)
RegisterService func(native *NativeService)
)
var (
Contracts = make(map[common.Address]RegisterService)
)
// Native service struct
// Invoke a native smart contract, new a native service
type NativeService struct {
CacheDB *storage.CacheDB
ServiceMap map[string]Handler
Notifications []*event.NotifyEventInfo
InvokeParam sstates.ContractInvokeParam
Input []byte
Tx *types.Transaction
Height uint32
Time uint32
BlockHash common.Uint256
ContextRef context.ContextRef
}
func (this *NativeService) Register(methodName string, handler Handler) {
this.ServiceMap[methodName] = handler
}
func (this *NativeService) Invoke() (interface{}, error) {
contract := this.InvokeParam
services, ok := Contracts[contract.Address]
if !ok {
return false, fmt.Errorf("Native contract address %x haven't been registered.", contract.Address)
}
services(this)
service, ok := this.ServiceMap[contract.Method]
if !ok {
return false, fmt.Errorf("Native contract %x doesn't support this function %s.",
contract.Address, contract.Method)
}
args := this.Input
this.Input = contract.Args
this.ContextRef.PushContext(&context.Context{ContractAddress: contract.Address})
notifications := this.Notifications
this.Notifications = []*event.NotifyEventInfo{}
result, err := service(this)
if err != nil {
return result, errors.NewDetailErr(err, errors.ErrNoCode, "[Invoke] Native serivce function execute error!")
}
this.ContextRef.PopContext()
this.ContextRef.PushNotifications(this.Notifications)
this.Notifications = notifications
this.Input = args
return result, nil
}
func (this *NativeService) NativeCall(address common.Address, method string, args []byte) (interface{}, error) {
c := states.ContractInvokeParam{
Address: address,
Method: method,
Args: args,
}
this.InvokeParam = c
return this.Invoke()
}