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Formatting revert error objects

See original GitHub issue

When a contract method reverts, it throws an error: “processing response error”.

In the v5, the error.message contains lot of stuff including the actual rpc response from the node. While in v4, error.message contained only the error message string from the JSON RPC error.

try {
    await contract.methodThatReverts()
} catch (err) {
    console.log(err.message); // prints ethers error message containing the json rpc response as it is (along with error stacks from node if sent)
    console.log(err.error.message); // short and sweet error message
}

ethers v5 revert error object:

Error: processing response error (body={"id":247,"jsonrpc":"2.0","error":{"message":"VM Exception while processing transaction: revert invalid start block number","code":-32000,"data":{"stack":"RuntimeError: VM Exception while processing transaction: revert invalid start block number\n    at Function.RuntimeError.fromResults (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/ganache-core/lib/utils/runtimeerror.js:89:13)\n    at module.exports (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/ganache-core/lib/utils/gas/guestimation.js:142:32)","name":"RuntimeError"}}}, error={"code":-32000,"data":{"stack":"RuntimeError: VM Exception while processing transaction: revert invalid start block number\n    at Function.RuntimeError.fromResults (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/ganache-core/lib/utils/runtimeerror.js:89:13)\n    at module.exports (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/ganache-core/lib/utils/gas/guestimation.js:142:32)","name":"RuntimeError"}}, code=SERVER_ERROR, version=web/5.0.0-beta.141)
    at Logger.makeError (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/@ethersproject/logger/lib/index.js:178:21)
    at Logger.throwError (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/@ethersproject/logger/lib/index.js:187:20)
    at /Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/@ethersproject/web/lib/index.js:181:32
    at step (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/@ethersproject/web/lib/index.js:33:23)
    at Object.next (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/@ethersproject/web/lib/index.js:14:53)
    at fulfilled (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/@ethersproject/web/lib/index.js:5:58)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:97:5) {
  reason: 'processing response error',
  code: 'SERVER_ERROR',
  body: {
    id: 247,
    jsonrpc: '2.0',
    error: {
      message: 'VM Exception while processing transaction: revert invalid start block number',
      code: -32000,
      data: [Object]
    }
  },
  error: Error: VM Exception while processing transaction: revert invalid start block number
      at getResult (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/@ethersproject/providers/lib/json-rpc-provider.js:70:21)
      at /Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/@ethersproject/web/lib/index.js:175:46
      at step (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/@ethersproject/web/lib/index.js:33:23)
      at Object.next (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/@ethersproject/web/lib/index.js:14:53)
      at fulfilled (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/@ethersproject/web/lib/index.js:5:58)
      at runMicrotasks (<anonymous>)
      at processTicksAndRejections (internal/process/task_queues.js:97:5) {
    code: -32000,
    data: {
      stack: 'RuntimeError: VM Exception while processing transaction: revert invalid start block number\n' +
        '    at Function.RuntimeError.fromResults (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/ganache-core/lib/utils/runtimeerror.js:89:13)\n' +
        '    at module.exports (/Users/sohamzemse/soham/kmpards/ESNCoreProjects/esn-contracts/node_modules/ganache-core/lib/utils/gas/guestimation.js:142:32)',
      name: 'RuntimeError'
    }
  }
}

ethers v4 revert error object (from a different project) looks like:

Error: VM Exception while processing transaction: revert insufficient balance
    at getResult (/Users/sohamzemse/soham/workspace/blockchain/ethereum/timeally/node_modules/ethers/providers/json-rpc-provider.js:40:21)
    at exports.XMLHttpRequest.request.onreadystatechange (/Users/sohamzemse/soham/workspace/blockchain/ethereum/timeally/node_modules/ethers/utils/web.js:111:30)
    at exports.XMLHttpRequest.dispatchEvent (/Users/sohamzemse/soham/workspace/blockchain/ethereum/timeally/node_modules/xmlhttprequest/lib/XMLHttpRequest.js:591:25)
    at setState (/Users/sohamzemse/soham/workspace/blockchain/ethereum/timeally/node_modules/xmlhttprequest/lib/XMLHttpRequest.js:610:14)
    at IncomingMessage.<anonymous> (/Users/sohamzemse/soham/workspace/blockchain/ethereum/timeally/node_modules/xmlhttprequest/lib/XMLHttpRequest.js:447:13)
    at IncomingMessage.emit (events.js:333:22)
    at endReadableNT (_stream_readable.js:1201:12)
    at processTicksAndRejections (internal/process/task_queues.js:84:21) {
  code: -32000,
  data: {
    stack: 'RuntimeError: VM Exception while processing transaction: revert insufficient balance\n' +
      '    at Function.RuntimeError.fromResults (/Users/sohamzemse/soham/workspace/blockchain/ethereum/timeally/node_modules/ganache-core/lib/utils/runtimeerror.js:89:13)\n' +
      '    at module.exports (/Users/sohamzemse/soham/workspace/blockchain/ethereum/timeally/node_modules/ganache-core/lib/utils/gas/guestimation.js:142:32)',
    name: 'RuntimeError'
  },
  url: 'http://localhost:7566',
  body: '{"method":"eth_estimateGas","params":[{"from":"0x5C2807c2E86ECDdDA3537EdFAA7752Ac9bbF9fcD","to":"0x73f898B5C93115eE95ec02cE0811E4D07fC4aEF0","data":"0xa9059cbb000000000000000000000000ff9861f72d4989a94a20ec19f6005b15b61c1c6b000000000000000000000000000000004b3b4ca85a86c47a098a224000000000"}],"id":50,"jsonrpc":"2.0"}',
  responseText: '{"id":50,"jsonrpc":"2.0","error":{"message":"VM Exception while processing transaction: revert insufficient balance","code":-32000,"data":{"stack":"RuntimeError: VM Exception while processing transaction: revert insufficient balance\\n    at Function.RuntimeError.fromResults (/Users/sohamzemse/soham/workspace/blockchain/ethereum/timeally/node_modules/ganache-core/lib/utils/runtimeerror.js:89:13)\\n    at module.exports (/Users/sohamzemse/soham/workspace/blockchain/ethereum/timeally/node_modules/ganache-core/lib/utils/gas/guestimation.js:142:32)","name":"RuntimeError"}}}'
}

Though I can access the revert message from err.error.message for now, I wanna confirm if reverts will be formatted in future, it might cause tests I’m writing to break.

Issue Analytics

State:
Created 3 years ago
Comments:8 (6 by maintainers)

Top GitHub Comments

1reaction

ricmoocommented, Jun 6, 2020

That part should not change.

The revert reason at some point may be also available in the main error, but this requires a bit more effort, since it isn’t being fed back in a nice machine readable way and each backend seems to choose their own format. 😦

0reactions

ricmoocommented, Aug 24, 2021

I think this issue may be stale, so I’m closing it. If not, please feel free to re-open or start a new issue/discussion.

Thanks! 😃

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