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Created March 10, 2021 09:21
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ZGEN coding test
Raw
senior_rust.md

Senior Rust coding test

The motivation behind the coding test is the measurement of the qualification and testing the learning attitude of the candidate.

Task

Create a simple ABI parser library. Please do NOT use any library you can find on the internet only certain exceptions detailed later.

  • Rust

Details

  • The library should accept a file (contains the abi of an Ethereum based smart contract), and a function signature with parameters depends on necessity.
  • The library should NOT use any external library except the one responsible for keccak256 hashing.
  • The library should be as simple as possible so the user doesn’t have pray for the undefined gods to make it work.

Test-cases

The ABI file will be provided which should satisfy the following test scenarios:

Function name Parameters Result transaction data
balanceOf [0x30E7d7FfF85C8d0E775140b1aD93C230D5595207] 0x70a0823100000000000000000000000030e7d7fff85c8d0e775140b1ad93c230d5595207
transfer [0x30E7d7FfF85C8d0E775140b1aD93C230D5595207, 20000000000] 0xa9059cbb00000000000000000000000030e7d7fff85c8d0e775140b1ad93c230d559520700000000000000000000000000000000000000000000000000000004a817c800
allowance [0x30E7d7FfF85C8d0E775140b1aD93C230D5595207, 0x81Fbae3C693624FEc9eF1a86626228980bEB1C71] 0xdd62ed3e00000000000000000000000030e7d7fff85c8d0e775140b1ad93c230d559520700000000000000000000000081fbae3c693624fec9ef1a86626228980beb1c71
  • So it should accept the function name and the parameters and should return the Transaction data.
  • If the candidate familiar with Solidity the library can return whether it should be an eth_call or an eth_sendTransaction next to the data.

Any other information should be researched by the candidate. In case of questions please contact us.

Links

Note

  • senior_rust_abi.json should be contained.
Raw
senior_rust_abi.json
[
{
"constant": true,
"inputs": [],
"name": "name",
"outputs": [
{
"name": "",
"type": "string"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "_spender",
"type": "address"
},
{
"name": "_value",
"type": "uint256"
}
],
"name": "approve",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "totalSupply",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "_from",
"type": "address"
},
{
"name": "_to",
"type": "address"
},
{
"name": "_value",
"type": "uint256"
}
],
"name": "transferFrom",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "decimals",
"outputs": [
{
"name": "",
"type": "uint8"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "_owner",
"type": "address"
}
],
"name": "balanceOf",
"outputs": [
{
"name": "balance",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "symbol",
"outputs": [
{
"name": "",
"type": "string"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "_to",
"type": "address"
},
{
"name": "_value",
"type": "uint256"
}
],
"name": "transfer",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "_owner",
"type": "address"
},
{
"name": "_spender",
"type": "address"
}
],
"name": "allowance",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"payable": true,
"stateMutability": "payable",
"type": "fallback"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "owner",
"type": "address"
},
{
"indexed": true,
"name": "spender",
"type": "address"
},
{
"indexed": false,
"name": "value",
"type": "uint256"
}
],
"name": "Approval",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "from",
"type": "address"
},
{
"indexed": true,
"name": "to",
"type": "address"
},
{
"indexed": false,
"name": "value",
"type": "uint256"
}
],
"name": "Transfer",
"type": "event"
}
]
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