func (t *ABstore) Invoke(ctx contractapi.TransactionContextInterface, A, B string, X int) error { var err error var Aval int var Bval int // Get the state from the ledger // TODO: will be nice to have a GetAllState call to ledger Avalbytes, err := ctx.GetStub().GetState(A) if err != nil { return fmt.Errorf("Failed to get state") } if Avalbytes == nil { return fmt.Errorf("Entity not found") } Aval, _ = strconv.Atoi(string(Avalbytes)) Bvalbytes, err := ctx.GetStub().GetState(B) if err != nil { return fmt.Errorf("Failed to get state") } if Bvalbytes == nil { return fmt.Errorf("Entity not found") } Bval, _ = strconv.Atoi(string(Bvalbytes)) // Perform the execution Aval = Aval - X Bval = Bval + X fmt.Printf("Aval = %d, Bval = %d\n", Aval, Bval) // Write the state back to the ledger err = ctx.GetStub().PutState(A, []byte(strconv.Itoa(Aval))) if err != nil { return err } err = ctx.GetStub().PutState(B, []byte(strconv.Itoa(Bval))) if err != nil { return err } return nil }

这是一段Go语言代码，实现了一个区块链智能合约的Invoke函数。该函数的功能是执行A和B的数值的转移，A的数值减去X，B的数值加上X。函数首先从区块链的存储中读取A和B的数值，然后执行数值转移，最后将计算结果写回区块链存储。