I had a backend golang project built and ran already in AWS, and I added geth to achieve part of the blockchain functionality. So far, I had a smart contract written with its go file auto-generated by geth called orderContract.go. Now, I need to run the code. Right below is my current project file struct
H&H
/main.go(package main)
/controller(folder, package controller)
____/A.go
____/B.go
____/orderContract.go(auto generated using abi)
A.go calls a function from orderContract.go, which will set values to a struct object defined in orderContract. Below is my code
orderContract.sol
pragma solidity ^0.8.5;
contract OrderContract {
struct OrderInfo{
uint64 _orderId;
string _orderName;
uint64 _addressId;
string _pickUpTime;
string _status;
string _orderType;
}
OrderInfo _orderInfo;
event SetOrderInfo(OrderInfo orderInfo);
function setOrderInfo(uint64 orderId, string memory orderName, uint64 addressId, string memory pickUpTime, string memory status, string memory orderType) external {
_orderInfo._orderId = orderId;
_orderInfo._orderName = orderName;
_orderInfo._addressId = addressId;
_orderInfo._pickUpTime = pickUpTime;
_orderInfo._status = status;
_orderInfo._orderType = orderType;
emit SetOrderInfo(_orderInfo);
}
function getOrderInfo() public view returns(OrderInfo memory) {
return _orderInfo;
}
}
snap code from A.go
conn, err := ethclient.Dial("HTTP://127.0.0.1:7545")
if err != nil {
log.Fatal(err)
}
privateKey, err := crypto.HexToECDSA("90df3126cb5b982d72d9909dea5a5e93306be0df4197c40b5f33b565ad950ee5")
if err != nil {
log.Fatal(err)
}
publicKey := privateKey.Public()
publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
if !ok {
log.Fatal("error casting public key to ECDSA")
}
fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)
nonce, err := conn.PendingNonceAt(context.Background(), fromAddress)
if err != nil {
log.Fatal(err)
}
gasPrice, err := conn.SuggestGasPrice(context.Background())
if err != nil {
log.Fatal(err)
}
auth := bind.NewKeyedTransactor(privateKey)
auth.Nonce = big.NewInt(int64(nonce))
auth.Value = big.NewInt(0) // in wei
auth.GasLimit = uint64(300000) // in units
auth.GasPrice = gasPrice
contract, err := NewController1(common.HexToAddress("0x902eb38dFab584EBef7570D33978b3D644bcfce7"), conn)
if err != nil {
log.Fatalf("Failed to instantiate contract : %v", err)
}
//set order info
tx, err := contract.SetOrderInfo(&bind.TransactOpts{}, 1, "orderName1", 1, "2019-11-10", "approved", "donation")
if err != nil {
fmt.Println("Here we go")
log.Fatal(err)
}
fmt.Printf("tx sent: %s", tx.Hash().Hex())
I m using Ganache to hold a local blockchain environment, and this project is backend project. A.go contains API that will be called, and the snap code of A.go shown above is part of an API.
When I run go run main.go everything seems fine, but when I call the API in A.go that contains the snap code part, it gives me error showing
net/http: nil Context
at line
tx, err := contract.SetOrderInfo(&bind.TransactOpts{}, 1, "orderName1", 1, "2019-11-10", "approved", "donation")
Could someone help me ? Thanks!
