Laravel Project using Web3 Issue
Published: 2024-04-06 16:00:15

Hello people, I am new here and I am currently working on my final year project, however I have faced some programming issue while trying to interact with smart contract that I have deployed onto the Ganache Blockchain, the objective is simple, i wanted to store some data such as amount, amount_type and description onto the smart contract storage and I could be able to retrieve the data from it. The code below is my smart contract function using Solidity. And i have successfully deployed onto Ganache Network.

```
// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.9.0;
pragma experimental ABIEncoderV2;

contract CompanyData {
    struct Data {
        uint256 amount;
        string amount_type;
        string cid;
    }

    address public admin;
    Data[] public dataList;
    uint256 public dataCount = 0;

    constructor() public {
        admin = msg.sender;
    }

    modifier onlyAdmin() {
        require(msg.sender == admin, "Only admin can call this function.");
        _;
    }

    function storeData( uint256 _amount, string memory _amount_type, string memory _cid) public onlyAdmin 
    {
        Data memory localData = Data(_amount, _amount_type, _cid);
        dataList.push(localData);
        dataCount++;
    }

    function getAllData() public view returns (Data[] memory) {
        return dataList;
    }

    function getDataCount() public view returns (uint){
        return dataCount;
    }
}

```
In my Laravel project, I have installed the Web3p/web3.php from Github, based on my understanding, for my scenario, i probably going to be using the contract->send() and contract->call() functions only right? I did specified all the requirements needed like sender address, contract address, arguments and callback functions. The function below is used to interact with the smart contract storedata function.

```
function storeData(Request $req)
  {
    $response = $this->addStatement($req);
    $contractAddress = '0x972b3c22070e2786039bAf93a1C90727D683DD7c';
    $adminAddress = "0x6c0d19425c4c226f1c107ff3606eb1b21ca44370";
    $cid = $response->getData()->cid;
    $amount = intval($req->input('amount'));
    $amount_type = $req->input('amount_type');
    ($this->contract)->at($contractAddress)->send('storeData', $amount, $amount_type, $cid, function ($err, $transaction) {
      if ($err !== null) {
        // Handle error
        echo 'Error: ' . $err;
        return;
      }

      // Handle successful transaction
      echo 'Transaction hash: ' . $transaction;
    });
    return redirect('/');
  }
```
The function below is to call the getdata function in smart contract

```
function retrieveData()
  {
    $contractAddress = '0x972b3c22070e2786039bAf93a1C90727D683DD7c';
    $this->contract->at($contractAddress)->call('getAllData', function ($err, $transaction) {
      if ($err !== null) {
        // Handle error
        echo 'Error: ' . $err;
        return;
      }
      // Handle successful transaction
      dd($transaction);
    });
  }
```
Basically, i could create a transaction and the transaction will be mined into a block in the Ganache network, however, I do not think the data is being stored into the smart contract storage.

I might need brothers and sisters help for this because I have been stucked for 2 weeks :(