ethereum/solidity

The Solidity Contract-Oriented Programming Language - By chatting here you agree to the https://github.com/ethereum/solidity/blob/develop/CODE_OF_CONDUCT.md

Gernot Pokorny

@gernotpokorny

Can somebody explain me where the satte of a state variable is stored?

is it stored on the blockchain or on the RAM of the node?

Gernot Pokorny

@gernotpokorny

Can somebody tell me when the contract is compiled to bytecode and is on the blockchain how can somebody verify what the smart contract code is and check where he wants to use the smart contract or not?

Is it necessary to include the source code somewhere + compiler information? Does this then deterministically compile everytime to the same bytecode?

Manish Ranjan

@bit-warrior

@gernotpokorny state of state variable is saved into state trie/tree. its not saved in RAM of node , it goes in blockchain datastore.

SkyClean

@SkyClean

Hello

I have Error: gas required exceeds allowance or always failing transaction when creating smart contract on remix.

Gernot Pokorny

@gernotpokorny

@bit-warrior what is meant with blockchain datastore? It is part of the blockchain?

SkyClean

@SkyClean

please give me tips

how to make contract with avoiding gas exceeds?

@gernotpokorny smart contract will be saved on blockchain.

Gernot Pokorny

@gernotpokorny

@SkyClean what is this datastorage?

Manish Ranjan

@bit-warrior

@gernotpokorny

Like for Geth, all the data related to the blockchain are saved in levelDB in form of different tries, like transaction trie, state tries, transaction receipt trrie. Level db is key-value database developed by Google.

SkyClean

@SkyClean

@bit-warrior can you give me some tips?

Gernot Pokorny

@gernotpokorny

@bit-warrior Ok so that means something like variable-states are generated by the txs and stored on the harddrive of the node. Once a new tx comes in the db on the harddrive of the node gets modified. So erc20 tokens are essentially stored in a database on the node?

Manish Ranjan

@bit-warrior

@SkyClean where are you deploying ur contract local EVM or a outside network?

Manish Ranjan

@bit-warrior

@gernotpokorny ecr tokens are contract to hold assets(something xyz coin) . So for example, u own 100 xyz coin at an ethereum address , this fact that you own 100 coin would be stored in the state trie, but ability to spend it will be controlled private key that hold.

Gernot Pokorny

@gernotpokorny

@bit-warrior ok and it is stored in thos levelDB? The blockchain is it also a db or does the blockchain consist of simple txt files?

SkyClean

@SkyClean

@bit-warrior I"m deploying contract to rospen test Net

with metamask

Gernot Pokorny

@gernotpokorny

On the blockchain contracts are stored as binary code?

Manish Ranjan

@bit-warrior

@gernotpokorny I have not seen anywhere in Ethereum specification any kind of recommendation about saving data in db vs file system. As long as you comply to the data structure recommended by specification , i guess u can choose to save anywhere you like.

Gernot Pokorny

@gernotpokorny

@bit-warrior I mean how does the geth implementation store the blockchain?

Manish Ranjan

@bit-warrior

Geth uses leveldb

Parity i guess uses Rocksdb

SkyClean

@SkyClean

@bit-warrior I"m deploying contract to rospen test Net
with metamask

but the contract has some big code amount.

so gas exceed error occurred

how can I avoid this error to make smart contract @bit-warrior

Destinatis

@destinatis

can someone help me

i deploy a smart contract, pass an address into a constructor

and store it

then i retrieve the address and its diffferent

are we not able to pass address type to constructor or something from remix?

Fatih Altuntaş

@altuntasfatih

in remix,you can do it like in picture

Destinatis

@destinatis

i see i need quotes

thanks man

Gernot Pokorny

@gernotpokorny

@bit-warrior Is information about accounts like balance and nonce etc also stored in the levelDB?

vasudev

@patelvasu

"gas required exceeds allowance or always failing transaction " this error get in remix

bluemoon2014

@bluemoon2014

what happened when i user new someContract? Does this deploy a new contract?

KarzanBotani

@KarzanBotani

Hey! Has anyone used React for their project? I'm having a very simple issue which is annyoing me a bit...

I'm trying to set one of my states to web3.eth.getAccounts() at 0. But it refuses.

class UserProfile extends Component {

  state = {
    accountAddress: ''
  };

  async getAccounts() {
    const accounts = await web3.eth.getAccounts();
    this.setState({ accountAddress: accounts[0] });

    console.log(accounts);

    return {};
  }

  render() {
    return (
      <Layout>
        <h3>UserProfile</h3>

        <h5>{this.state.accountAddress}</h5>
      </Layout>
    );
  };

};

export default UserProfile;

Mateja Trifunovski

@Matko95

@botanki AFAIK state should be declared like this

constructor(props) {
    super(props)
    this.state = {
      accountAddress: ''
    }
  }

KarzanBotani

@KarzanBotani

@Matko95 thx, I solved it! :) used componentDidMount instead

Ayush Gupta

@ayushgupta0610_twitter

How can I check and execute a transaction on the basis of a date (say like Dec 31st 2020) in my smart contract. If the date does not match the required date, the transaction should throw error.

Daniel

@DanielRX

Look up unix ts @ayushgupta0610_twitter

Then compare now to something in that form

Ayush Gupta

@ayushgupta0610_twitter

How exactly should I play with dates in my smart contract (being the right question)?

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