opengsn/workshop

About A sample project to how how to add GSN to a simple Web3 project. See the PRs to see the needed changes. NOTE: the video was created for a previous version

workshop's Issues

Truffle config file is missing and due to that it does not deploy and throws an error

Error

yarn run v1.22.19
$ truffle deploy && yarn build && yarn serve ./build/html
Could not find suitable configuration file.
Truffle v5.9.0 (core: 5.9.0)
Node v18.15.0
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Failed to relay call

@drortirosh, after successfully running yarn gsn-with-ganache and yarn start

When I click on Capture the flag button, I receive errors in the browser console

Console output

calling sendAsync{"method":"eth_sendTransaction","params":[{"gas":"0xb1bb","gasPrice":"0x4a817c800","from":"0x90f8bf6a479f320ead074411a4b0e7944ea8c9c1","to":"0xfc628dd79137395f3c9744e33b1c5de554d94882","data":"0x239e26f2"}],"id":66,"jsonrpc":"2.0"} bundle.js:61918 fetchRelaysAdded: found 1 relays bundle.js:47566 Sending in view mode: {"jsonrpc":"2.0","id":1,"method":"eth_call","params":[{"from":"0x0000000000000000000000000000000000000000","to":"0xC89Ce4735882C9F0f0FE26686c53074E09B0D550","gas":"0xb71b00","data":"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","gasPrice":"0x4a817c800"},"latest"]} encoded data: {"relayRequest":{"request":{"to":"0xfc628dd79137395f3c9744e33b1c5de554d94882","data":"0x239e26f2","from":"0x90f8bf6a479f320ead074411a4b0e7944ea8c9c1","value":"0","nonce":"0","gas":"45499","validUntilTime":"1675692252"},"relayData":{"relayWorker":"0x0000000000000000000000000000000000000000","transactionCalldataGasUsed":"0x176c","paymasterData":"0x","maxFeePerGas":"20000000000","maxPriorityFeePerGas":"20000000000","paymaster":"0xD833215cBcc3f914bD1C9ece3EE7BF8B14f841bb","clientId":"1","forwarder":"0x254dffcd3277C0b1660F6d42EFbB754edaBAbC2B"}},"signature":"0x","approvalData":"0x","maxAcceptanceBudget":"12000000"} bundle.js:47584 relayCall res=0x0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000f142fc1e9c000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000000 bundle.js:63097 nextRelay: find fastest relay from: [{"relayManager":"0xc6232031bF6C4858e7BC9eb3e253dBB45C58ef7D","relayUrl":"http://127.0.0.1:36869"}] bundle.js:63153 getRelayAddressPing URL: http://127.0.0.1:36869 bundle.js:63099 race finished with a result: {"errors":{"dataType":"Map","value":[["http://127.0.0.1:36869",{"message":"Network Error","name":"Error","stack":"Error: Network Error\n at createError (http://localhost:3000/bundle.js:68018:15)\n at XMLHttpRequest.handleError (http://localhost:3000/bundle.js:67537:14)","config":{"url":"http://127.0.0.1:36869/getaddr?paymaster=0xD833215cBcc3f914bD1C9ece3EE7BF8B14f841bb","method":"get","headers":{"Accept":"application/json, text/plain, */*"},"transformRequest":[null],"transformResponse":[null],"timeout":15000,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","maxContentLength":-1,"maxBodyLength":-1,"transitional":{"silentJSONParsing":true,"forcedJSONParsing":true,"clarifyTimeoutError":false}}}]]},"results":[]}

Error

Prevsiously when running yarn start command I was facing below error
Public state variable has override specified but does not override anything. solidity

Becauase in line# 18 string public override versionRecipient = "3.0.0"; the override specifier is used.

To eliminate this error I removed the override specifier because compiler says that I am not overriding anything

So now line# 18 is: string public versionRecipient = "3.0.0";

Than yarn start worked fine.

Below is CaptureTheFlag.sol

/**
 * SPDX-License-Identifier:MIT
 */
pragma solidity ^0.8.7;

import "@opengsn/contracts/src/ERC2771Recipient.sol";

contract CaptureTheFlag is ERC2771Recipient {

    event FlagCaptured(address previousHolder, address currentHolder);

    address public currentHolder = address(0);

    constructor(address forwarder) {
        _setTrustedForwarder(forwarder);
    }

    string public versionRecipient = "3.0.0";

    function captureTheFlag() external {
        address previousHolder = currentHolder;

        currentHolder = _msgSender();

        emit FlagCaptured(previousHolder, currentHolder);
    }
}

Unable to start GSN

Hi,

I try to make npx gsn start and returns me this error:

...
Naive Paymaster successfully funded, balance: 1
Error: error:0308010C:digital envelope routines::unsupported
    at new Hash (node:internal/crypto/hash:71:19)
    at Object.createHash (node:crypto:133:10)
    at hash160 (/home/ivanmmurcia/Desktop/workshop-GSN/node_modules/ethereum-cryptography/vendor/hdkey-without-crypto.js:249:21)
    at HDKey.set (/home/ivanmmurcia/Desktop/workshop-GSN/node_modules/ethereum-cryptography/vendor/hdkey-without-crypto.js:50:24)
    at Function.HDKey.fromMasterSeed (/home/ivanmmurcia/Desktop/workshop-GSN/node_modules/ethereum-cryptography/vendor/hdkey-without-crypto.js:194:20)
    at Function.EthereumHDKey.fromMasterSeed (/home/ivanmmurcia/Desktop/workshop-GSN/node_modules/ethereumjs-wallet/hdkey.js:20:26)
    at new KeyManager (/home/ivanmmurcia/Desktop/workshop-GSN/node_modules/@opengsn/relay/src/KeyManager.ts:60:26)
    at GsnTestEnvironmentClass._runServer (/home/ivanmmurcia/Desktop/workshop-GSN/node_modules/@opengsn/cli/src/GsnTestEnvironment.ts:174:31)
    at GsnTestEnvironmentClass.startGsn (/home/ivanmmurcia/Desktop/workshop-GSN/node_modules/@opengsn/cli/src/GsnTestEnvironment.ts:86:16)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at /home/ivanmmurcia/Desktop/workshop-GSN/node_modules/@opengsn/cli/src/commands/gsn-start.ts:18:17 {
  opensslErrorStack: [ 'error:03000086:digital envelope routines::initialization error' ],
  library: 'digital envelope routines',
  reason: 'unsupported',
  code: 'ERR_OSSL_EVP_UNSUPPORTED'

Manjaro Linux; Build ID: rolling 64 bits
Truffle v5.6.0 (core: 5.6.0)
Ganache v7.4.3
Solidity - 0.8.17 (solc-js)
Node v18.10.0
Web3.js v1.7.4

Missing second argument when using WhitelistPaymaster.sol

Hi Open GSN team,
I just want you to fix a bug when using whitelistpaymaster.

on line 18 on migrations\2_deploy_contracts.js the address 0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1 is expected to be whitelisted but a second boolean argument must be sent which is missing.
It is fixed on my side, let me know if I can create a pull request. I will be happy to do it :D.

Fail to relay calls:

Hi,
I'm trying to relay calls on polygon using a custom paymaster which already been funded however i get the following error:

Relaying errors (1):
https://polygon.3-0-0-beta-3.opengsn.org/v3 => local view call to 'relayCall()' reverted: view call to 'relayCall' reverted in client: {"code":-32603,"message":"Internal JSON-RPC error.","data":{"code":-32000,"message":"err: insufficient funds for gas * price + value: address 0x434EFBCA662f6F846f8DeC3fdE52Fac4c8792e03 have 2550816605859437982 want 3273095523480000000 (supplied gas 12000000)"}} stack:Error: local view call to 'relayCall()' reverted: view call to 'relayCall' reverted in client: {"code":-32603,"message":"Internal JSON-RPC error.","data":{"code":-32000,"message":"err: insufficient funds for gas * price + value: address 0x434EFBCA662f6F846f8DeC3fdE52Fac4c8792e03 have 2550816605859437982 want 3273095523480000000 (supplied gas 12000000)"}}

I'm using the following configuration:
{logLevel: 'debug'},
paymasterAddress: '0xFcA1200C2f42197539b70d17714eEf98D1af8204',
performDryRunViewRelayCall: false,
minMaxPriorityFeePerGas: 82716215680,
// maxViewableGasLimit: '3157770248985000000',

        }

I've tried to set the maxViewableGasLimit but nothing helped.

Unable to Start Server

Gas shop

Failed to execute `yarn gsn-with-ganache`

$ yarn gsn-with-ganache
...
Setting minimum stake of 1 TestWeth on Hub
Setting minimum stake of 0.000000000000000001 wEth
Naive Paymaster successfully funded, balance: 1
Registering GSN relayer at http://127.0.0.1:35287
Error: Request failed with status code 503
    at createError (/home/aping/git/workshop/node_modules/axios/lib/core/createError.js:16:15)
    at settle (/home/aping/git/workshop/node_modules/axios/lib/core/settle.js:17:12)
    at IncomingMessage.handleStreamEnd (/home/aping/git/workshop/node_modules/axios/lib/adapters/http.js:269:11)
    at IncomingMessage.emit (node:events:525:35)
    at endReadableNT (node:internal/streams/readable:1359:12)
    at processTicksAndRejections (node:internal/process/task_queues:82:21) {
  config: {
    url: 'http://127.0.0.1:35287/getaddr',
    method: 'get',
    headers: {
      Accept: 'application/json, text/plain, */*',
      'Content-Type': 'application/json',
      'User-Agent': 'axios/0.21.4',
      host: '127.0.0.1:35287'
  

feat: using this hardhat plugin to bootstrap examples.

I have build a hardhat plugin allows developer to deploy contracts without paying gas using GSN. This can be used for wrapping up a quick workshop for GSN.

The plugin is published here and this is a working example.