Issue detected: data exceeds limits (length=3, offset=32, code=BUFFER_OVERRUN, version=abi/5.0.7) within next-js and ethereum

While working on my Ethereum and Next.js project, I encountered an error during the initialization of the project:

Error: data out-of-bounds (length=3, offset=32, code=BUFFER_OVERRUN, version=abi/5.0.7)
    at Logger.makeError (/home/Documents/projects/ethereum/kickstarter/node_modules/@ethersproject/logger/lib/index.js:199:21)
    at Logger.throwError (/home/Documents/projects/ethereum/kickstarter/node_modules/@ethersproject/logger/lib/index.js:208:20)
    at Reader._peekBytes (/home/Documents/projects/ethereum/kickstarter/node_modules/@ethersproject/abi/lib/coders/abstract-coder.js:149:24)
    at Reader.readBytes (/home/Documents/projects/ethereum/kickstarter/node_modules/@ethersproject/abi/lib/coders/abstract-coder.js:161:26)
    at Reader.readValue (/home/Documents/projects/ethereum/kickstarter/node_modules/@ethersproject/abi/lib/coders/abstract-coder.js:167:48)
    at NumberCoder.decode (/home/Documents/projects/ethereum/kickstarter/node_modules/@ethersproject/abi/lib/coders/number.js:49:28)
    at /home/Documents/projects/ethereum/kickstarter/node_modules/@ethersproject/abi/lib/coders/array.js:106:31
    at Array.forEach (<anonymous>)
    at Object.unpack (/home/Documents/projects/ethereum/kickstarter/node_modules/@ethersproject/abi/lib/coders/array.js:85:12)
    at TupleCoder.decode (/home/Documents/projects/ethereum/kickstarter/node_modules/@ethersproject/abi/lib/coders/tuple.js:39:49)
    at AbiCoder.decode (/home/Documents/projects/ethereum/kickstarter/node_modules/@ethersproject/abi/lib/abi-coder.js:93:22)
    at ABICoder.decodeParametersWith (/home/Documents/projects/ethereum/kickstarter/node_modules/web3-eth-abi/lib/index.js:303:30)
    at ABICoder.decodeParameters (/home/Documents/projects/ethereum/kickstarter/node_modules/web3-eth-abi/lib/index.js:284:17)
    at Contract._decodeMethodReturn (/home/Documents/projects/ethereum/kickstarter/node_modules/web3-eth-contract/lib/index.js:469:22)
    at Method.outputFormatter (/home/Documents/projects/ethereum/kickstarter/node_modules/web3-eth-contract/lib/index.js:759:42)
    at Method.formatOutput (/home/Documents/projects/ethereum/kickstarter/node_modules/web3-core-method/lib/index.js:146:54) {
  reason: 'data out-of-bounds',
  code: 'BUFFER_OVERRUN',
  length: 3,
  offset: 32
}

The error occurred inside getServerSideProps. Initially, this was my code snippet:

let campaigns;
try {
  // This returns an array of contracts in Solidity contract
  campaigns = await factory.methods.getDeployedCampaign().call();
 
} catch (e) {
  console.log("error in index server", e);
}

Even after thoroughly checking the code, I couldn't find any issue. I suspected that the problem might be related to returning an array of addresses. Although we cannot return arrays of structs from Solidity, arrays of addresses are permissible. Nonetheless, I decided to retrieve each campaign individually. So, I updated the contract code as follows:

contract CampaignFactory{
  address[] public deployedCampaigns;
  uint public campaignsCount;
  
      function createCampaign(uint minimum)public{
          Campaign newCampaign=new Campaign(minimum,msg.sender);
          deployedCampaigns.push(address(newCampaign));
          campaignsCount++;
  
      }
      // Return individual campaign
      function getDeployedCampaign(uint index) public view returns(address ){
          return deployedCampaigns[index];
      }
  
      function getCampaignCounts() public view returns(uint){
          return campaignsCount;
      }
  }

I subsequently corrected the server-side code accordingly:

export async function getServerSideProps(context) {
  let campaigns;
  let campaignsCount;
  try {
    // Get the number of campaigns
    campaignsCount = await factory.methods.getCampaignCounts().call();
    campaigns = await Promise.all(
      Array(parseInt(campaignsCount))
        .fill()
        .map((element, index) => {
          return factory.methods.getDeployedCampaign(index).call();
        })
    );
    console.log("camapigns in index", campaigns);
  } catch (e) {
    console.log("error in index server", e);
  }
  return {
    props: { campaigns: campaigns || [] },
  };
}

After making these changes, the same error persisted. However, upon refreshing the page, the errors vanished, and I could see the data displayed on the UI. This made me believe that there were no issues with the contract itself but rather with the interaction between JavaScript.

javascriptnext.jsethereumsoliditysmartcontracts

Answer №1

During my time working with Polygon, I encountered a similar issue that required me to switch the rpc url from wss to https. It's worth a try if you haven't already considered it.

Answer №2

Here's a helpful tip: Always verify your ABI.

In my specific scenario, I encountered an issue where my function was supposed to return a tuple consisting of 1 uint256 and 3 strings. However, upon inspecting my ABI, I discovered that it was actually set up to return 4 strings within this tuple.

For instance:

struct Contact{
        uint256 id;
        string symbol;
        string address_;
        string nickname;
    }


     function getContacts(address from, string calldata symbol, uint256 fromId, uint256 length) external view returns (Contact[] memory) {
     ...
     }

Upon further examination of the ABI, I noticed the discrepancy:

  {"inputs": [{"internalType": "address","name": "from","type": "address"},
                {"internalType": "string","name": "symbol","type": "string"},
                {"internalType": "uint256","name": "fromId","type": "uint256"},
                {"internalType": "uint256","name": "length","type": "uint256"}],
            "name": "getContacts",
            "outputs": [{"components": [{"internalType": "uint256","name": "id","type": "uint256"},
                        {"internalType": "string","name": "symbol","type": "string"},
                        {"internalType": "string","name": "address_","type": "string"},
                    {"internalType": "string","name": "nickname","type": "string"},
                    {"internalType": "string","name": "OTHERTHING","type": "string"}],//<-- ERROR
                    "internalType": "struct Contacts.Contact[]","name": "","type": "tuple[]"}],
            "stateMutability": "view", "type": "function"},

Always double-check your ABI details and make sure all values are accurate and valid.

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