نموذج برنامج جديد لسلسلة Hyperledger Fabric

type SimpleContract struct {
	contractapi.Contract
}

type ContractChaincode struct {
	DefaultContract       string
	contracts             map[string]contractChaincodeContract
	metadata              metadata.ContractChaincodeMetadata
	Info                  metadata.InfoMetadata
	TransactionSerializer serializer.TransactionSerializer
}

func (cc *ContractChaincode) Invoke(stub shim.ChaincodeStubInterface) peer.Response {

	nsFcn, params := stub.GetFunctionAndParameters()

	li := strings.LastIndex(nsFcn, ":")

	var ns string
	var fn string

	if li == -1 {
		ns = cc.DefaultContract
		fn = nsFcn
	} else {
		ns = nsFcn[:li]
		fn = nsFcn[li+1:]
	}
       ...
       nsContract := cc.contracts[ns]
       ...
       successReturn, successIFace, errorReturn = nsContract.functions[fn].Call(ctx, transactionSchema, &cc.metadata.Components, serializer, params...)
       ...
       return shim.Success([]byte(successReturn))
}  

func (sc *SimpleContract) Whois(ctx contractapi.TransactionContextInterface) (string, error) {
	return ctx.GetClientIdentity().GetID()
}

func (sc *SimpleContract) Write(ctx contractapi.TransactionContextInterface, key string, value []byte) error {
	return ctx.GetStub().PutState(key, value)
}

func (sc *SimpleContract) Create(ctx CustomTransactionContextInterface, key string, value string) error {
	existing := ctx.GetData()

	if existing != nil {
		return fmt.Errorf("Cannot create world state pair with key %s. Already exists", key)
	}

	err := ctx.GetStub().PutState(key, []byte(value))

	if err != nil {
		return errors.New("Unable to interact with world state")
	}

	return nil
}

type CustomTransactionContextInterface interface {
	contractapi.TransactionContextInterface
	GetData() []byte
	SetData([]byte)
}

type CustomTransactionContext struct {
	contractapi.TransactionContext
	data []byte
}

// GetData return set data
func (ctc *CustomTransactionContext) GetData() []byte {
	return ctc.data
}

// SetData provide a value for data
func (ctc *CustomTransactionContext) SetData(data []byte) {
	ctc.data = data
}

simpleContract := new(SimpleContract)

simpleContract.TransactionContextHandler = new(CustomTransactionContext)

func GetWorldState(ctx CustomTransactionContextInterface) error {
	_, params := ctx.GetStub().GetFunctionAndParameters()

	if len(params) < 1 {
		return errors.New("Missing key for world state")
	}

	existing, err := ctx.GetStub().GetState(params[0])

	if err != nil {
		return errors.New("Unable to interact with world state")
	}

	ctx.SetData(existing)

	return nil
}

simpleContract.BeforeTransaction = GetWorldState

func (sc *SimpleContract) Read(ctx CustomTransactionContextInterface, key string) (string, error) {
	existing := ctx.GetData()

	if existing == nil {
		return "", fmt.Errorf("Cannot read world state pair with key %s. Does not exist", key)
	}

	return string(existing), nil
}

func After(ctx contractapi.TransactionContextInterface, beforeValue interface{}) error {
	fmt.Println(ctx.GetStub().GetTxID())
	fmt.Println("beforeValue", beforeValue)
	return nil
}

e503e98e4c71285722f244a481fbcbf0ff4120adcd2f9067089104e5c3ed0efe # txid
beforeValue مرحبًا # القيمة من الطريقة السابقة

func UnknownTransactionHandler(ctx CustomTransactionContextInterface) error {
	fcn, args := ctx.GetStub().GetFunctionAndParameters()
	return fmt.Errorf("Invalid function %s passed with args %v", fcn, args)
}

simpleContract.UnknownTransaction = UnknownTransactionHandler

خطأ: فشل المصادقة أثناء الاستعلام. الاستجابة: الحالة: 500 رسالة: "تم تمرير وظيفة غير صالحة BadRequest مع args [BadKey]"

cc, err := contractapi.NewChaincode(simpleContract, yetAnotherContract)

	if err != nil {
		panic(err.Error())
	}

	if err := cc.Start(); err != nil {
		panic(err.Error())
	}

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