Obtenir tout le temps un «avertissement de gaz infini» dans la fonction Approuver et appeler – Pourquoi?

Adrian49

Obtenir tout le temps un «avertissement de gaz infini» dans la fonction Approuver et appeler – Pourquoi?


Je suis nouveau dans le développement des smartcontracts.

J’ai cette erreur:

 { "Creation": { "codeDepositCost": "856200", "executionCost": "41158", "totalCost": "897358" }, "External": { "FerrumToken()": "80511", "allowance(address,address)": "861", "approve(address,uint256)": "20492", "approveAndCall(address,uint256,bytes4)": "infinite", "balanceOf(address)": "634", "burn(uint256)": "42675", "burnFrom(address,uint256)": "63577", "decimals()": "522", "name()": "404", "symbol()": "580", "totalSupply()": "430", "transferFrom(address,address,uint256)": "65901", "transferTEST(address,uint256)": "41978", "verID()": "672" }, "Internal": { "_transfer(address,address,uint256)": "infinite" } } 

Code source:

 pragma solidity ^0.4.19; interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; } contract Ferrum { // Public variables of the token bytes32 public name; bytes32 public symbol; uint8 public decimals = 5; uint256 public totalSupply; uint256 public verID = 1.0; // This creates an array with all balances mapping (address => uint256) public balanceOf; mapping (address => mapping (address => uint256)) public allowance; // This generates a public event on the blockchain that will notify clients event Transfer(address indexed from, address indexed to, uint256 value); // This notifies clients about the amount burnt event Burn(address indexed from, uint256 value); /** * Constrctor function * * Initializes contract with initial supply tokens to the creator of the contract */ function TrainingToken( ) public { totalSupply = 15800000000000; // Update total supply with the decimal amount balanceOf[msg.sender] = 15800000000000; // Give the creator all initial tokens name = "TrainingToken"; // Set the name for display purposes symbol = "TT"; // Set the symbol for display purposes } /** * Internal transfer, only can be called by this contract */ function _transfer(address _from, address _to, uint _value) internal { // Prevent transfer to 0x0 address. Use burn() instead require(_to != 0x0); // Check if the sender has enough require(balanceOf[_from] >= _value); // Check for overflows require(balanceOf[_to] + _value > balanceOf[_to]); // Save this for an assertion in the future uint previousBalances = balanceOf[_from] + balanceOf[_to]; // Subtract from the sender balanceOf[_from] -= _value; // Add the same to the recipient balanceOf[_to] += _value; Transfer(_from, _to, _value); // Asserts are used to use static analysis to find bugs in your code. They should never fail assert(balanceOf[_from] + balanceOf[_to] == previousBalances); } /** * Transfer tokens * * Send `_value` tokens to `_to` from your account * * @param _to The address of the recipient * @param _value the amount to send */ function transfer(address _to, uint256 _value) public { _transfer(msg.sender, _to, _value); } function transferTEST(address _to, uint256 _value) public { require(balanceOf[msg.sender] >= _value); // Check if the sender has enough require(balanceOf[_to] + _value >= balanceOf[_to]); // Check for overflows balanceOf[msg.sender] -= _value; // Subtract from the sender balanceOf[_to] += _value; // Add the same to the recipient } /** * Transfer tokens from other address * * Send `_value` tokens to `_to` on behalf of `_from` * * @param _from The address of the sender * @param _to The address of the recipient * @param _value the amount to send */ function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) { require(_value <= allowance[_from][msg.sender]); // Check allowance allowance[_from][msg.sender] -= _value; _transfer(_from, _to, _value); return true; } /** * Set allowance for other address * * Allows `_spender` to spend no more than `_value` tokens on your behalf * * @param _spender The address authorized to spend * @param _value the max amount they can spend */ function approve(address _spender, uint256 _value) public returns (bool success) { allowance[msg.sender][_spender] = _value; return true; } /** * Set allowance for other address and notify * * Allows `_spender` to spend no more than `_value` tokens on your behalf, and then ping the contract about it * * @param _spender The address authorized to spend * @param _value the max amount they can spend * @param _extraData some extra information to send to the approved contract */ function approveAndCall(address _spender, uint256 _value, bytes _extraData) public returns (bool success) { tokenRecipient spender = tokenRecipient(_spender); if (approve(_spender, _value)) { spender.receiveApproval(msg.sender, _value, this, _extraData); return true; } } /** * Destroy tokens * * Remove `_value` tokens from the system irreversibly * * @param _value the amount of money to burn */ function burn(uint256 _value) public returns (bool success) { require(balanceOf[msg.sender] >= _value); // Check if the sender has enough balanceOf[msg.sender] -= _value; // Subtract from the sender totalSupply -= _value; // Updates totalSupply Burn(msg.sender, _value); return true; } /** * Destroy tokens from other account * * Remove `_value` tokens from the system irreversibly on behalf of `_from`. * * @param _from the address of the sender * @param _value the amount of money to burn */ function burnFrom(address _from, uint256 _value) public returns (bool success) { require(balanceOf[_from] >= _value); // Check if the targeted balance is enough require(_value <= allowance[_from][msg.sender]); // Check allowance balanceOf[_from] -= _value; // Subtract from the targeted balance allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance totalSupply -= _value; // Update totalSupply Burn(_from, _value); return true; } } 

dans la section « approveandcall » j’ai tout le temps ces avertissements, que je ne peux pas comprendre, pourquoi:

Gaz d'avertissement

Quelqu’un peut-il me dire pourquoi cela se produit avec un échantillon de code?

Merci à tous pour votre aide

Réponses


 smarx

J’ai cette erreur:

Mais vous n’avez aucune erreur. Vous avez deux avertissements.

L’une concerne l’utilisation potentiellement illimitée de gaz d’ approveAndCall . Le compilateur n’a aucune idée de la quantité de gaz qui sera consommée car cela dépend du contrat tokenRecipient qui sera appelé. Il n’y a rien de mal à obtenir une estimation de gaz comme celle-ci; cela signifie simplement que l’utilisation de gaz de la fonction ne peut pas être connue au moment de la compilation.

Le deuxième avertissement est un message qui apparaît chaque fois que vous utilisez require ou assert . Il vous indique quand vous devez utiliser lequel.

Les deux avertissements ont du sens compte tenu de votre code. Maintenant que vous les avez lus et compris, vous pouvez les ignorer.

 

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