How to charge percentage of transaction cost?
Example:
uint public createPostCost = 0.0003 ether;
function createPost(bytes32 _post)
public payable {
require(msg.value >= createPostCost);
Post memory newPost;
newPost.post = _post;
}
Within a discussion forum dapp, the current implementation charges users a set fee per post created. I would like the charge to be dynamic, say 10% of the gas cost of the transaction. Is this possible to implement in the contract? Or is this something for front-end web3 to handle?
solidity web3js contract-development gas gas-limit
edited 3 hours ago
shane
2,4524832
asked 3 hours ago
Jaren LJaren L
335
add a comment |
Example:
uint public createPostCost = 0.0003 ether;
function createPost(bytes32 _post)
public payable {
require(msg.value >= createPostCost);
Post memory newPost;
newPost.post = _post;
}
Within a discussion forum dapp, the current implementation charges users a set fee per post created. I would like the charge to be dynamic, say 10% of the gas cost of the transaction. Is this possible to implement in the contract? Or is this something for front-end web3 to handle?
solidity web3js contract-development gas gas-limit
edited 3 hours ago
shane
2,4524832
asked 3 hours ago
Jaren LJaren L
335
add a comment |
Example:
uint public createPostCost = 0.0003 ether;
function createPost(bytes32 _post)
public payable {
require(msg.value >= createPostCost);
Post memory newPost;
newPost.post = _post;
}
Within a discussion forum dapp, the current implementation charges users a set fee per post created. I would like the charge to be dynamic, say 10% of the gas cost of the transaction. Is this possible to implement in the contract? Or is this something for front-end web3 to handle?
solidity web3js contract-development gas gas-limit
edited 3 hours ago
shane
2,4524832
asked 3 hours ago
Jaren LJaren L
335
Example:
uint public createPostCost = 0.0003 ether;
function createPost(bytes32 _post)
public payable {
require(msg.value >= createPostCost);
Post memory newPost;
newPost.post = _post;
}
Within a discussion forum dapp, the current implementation charges users a set fee per post created. I would like the charge to be dynamic, say 10% of the gas cost of the transaction. Is this possible to implement in the contract? Or is this something for front-end web3 to handle?
solidity web3js contract-development gas gas-limit
solidity web3js contract-development gas gas-limit
edited 3 hours ago
shane
2,4524832
asked 3 hours ago
Jaren LJaren L
335
edited 3 hours ago
shane
2,4524832
asked 3 hours ago
Jaren LJaren L
335
edited 3 hours ago
shane
2,4524832
edited 3 hours ago
shane
2,4524832
edited 3 hours ago
shane
2,4524832
2,4524832
asked 3 hours ago
Jaren LJaren L
335
asked 3 hours ago
Jaren LJaren L
335
asked 3 hours ago
Jaren LJaren L
335
335
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Yes, you can let the charge be a function of the gas of the transaction. You would do something like this:
uint256 charge = gasleft() / 10;
This is sensitive and you should know that gasleft() returns the amount of gas available at that point in the execution. Therefore, if you call gasleft() at the beginning of a function, the number will be higher than at the end of the function.
Additionally, someone may send a lot of unnecessary gas, so they could end up paying a lot.
My opinion is that it is best to handle this on the front-end.
Edit
If you are trying to take into account the gasPrice, you can use tx.gasprice. See here for more information.
answered 3 hours ago
shaneshane
2,4524832
2
Psst,msg.gashas been removed and replaced bygasleftas per solidity.readthedocs.io/en/latest/…
– Lauri Peltonen
3 hours ago
Ahh yes. Thank you.
– shane
3 hours ago
Ah that makes sense. If I made a require to check the msg.value >= 10% of tx.gasprice, would that work? Would there be discrepancies between generating the web3 function call price + value and the contract value?
– Jaren L
27 mins ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Yes, you can let the charge be a function of the gas of the transaction. You would do something like this:
uint256 charge = gasleft() / 10;
This is sensitive and you should know that gasleft() returns the amount of gas available at that point in the execution. Therefore, if you call gasleft() at the beginning of a function, the number will be higher than at the end of the function.
Additionally, someone may send a lot of unnecessary gas, so they could end up paying a lot.
My opinion is that it is best to handle this on the front-end.
Edit
If you are trying to take into account the gasPrice, you can use tx.gasprice. See here for more information.
answered 3 hours ago
shaneshane
2,4524832
2
Psst,msg.gashas been removed and replaced bygasleftas per solidity.readthedocs.io/en/latest/…
– Lauri Peltonen
3 hours ago
Ahh yes. Thank you.
– shane
3 hours ago
Ah that makes sense. If I made a require to check the msg.value >= 10% of tx.gasprice, would that work? Would there be discrepancies between generating the web3 function call price + value and the contract value?
– Jaren L
27 mins ago
add a comment |
Yes, you can let the charge be a function of the gas of the transaction. You would do something like this:
uint256 charge = gasleft() / 10;
This is sensitive and you should know that gasleft() returns the amount of gas available at that point in the execution. Therefore, if you call gasleft() at the beginning of a function, the number will be higher than at the end of the function.
Additionally, someone may send a lot of unnecessary gas, so they could end up paying a lot.
My opinion is that it is best to handle this on the front-end.
Edit
If you are trying to take into account the gasPrice, you can use tx.gasprice. See here for more information.
answered 3 hours ago
shaneshane
2,4524832
2
Psst,msg.gashas been removed and replaced bygasleftas per solidity.readthedocs.io/en/latest/…
– Lauri Peltonen
3 hours ago
Ahh yes. Thank you.
– shane
3 hours ago
Ah that makes sense. If I made a require to check the msg.value >= 10% of tx.gasprice, would that work? Would there be discrepancies between generating the web3 function call price + value and the contract value?
– Jaren L
27 mins ago
add a comment |
Yes, you can let the charge be a function of the gas of the transaction. You would do something like this:
uint256 charge = gasleft() / 10;
This is sensitive and you should know that gasleft() returns the amount of gas available at that point in the execution. Therefore, if you call gasleft() at the beginning of a function, the number will be higher than at the end of the function.
Additionally, someone may send a lot of unnecessary gas, so they could end up paying a lot.
My opinion is that it is best to handle this on the front-end.
Edit
If you are trying to take into account the gasPrice, you can use tx.gasprice. See here for more information.
answered 3 hours ago
shaneshane
2,4524832
Yes, you can let the charge be a function of the gas of the transaction. You would do something like this:
uint256 charge = gasleft() / 10;
This is sensitive and you should know that gasleft() returns the amount of gas available at that point in the execution. Therefore, if you call gasleft() at the beginning of a function, the number will be higher than at the end of the function.
Additionally, someone may send a lot of unnecessary gas, so they could end up paying a lot.
My opinion is that it is best to handle this on the front-end.
Edit
If you are trying to take into account the gasPrice, you can use tx.gasprice. See here for more information.
answered 3 hours ago
shaneshane
2,4524832
edited 3 hours ago
answered 3 hours ago
shaneshane
2,4524832
answered 3 hours ago
shaneshane
2,4524832
answered 3 hours ago
shaneshane
2,4524832
2,4524832
2
Psst,msg.gashas been removed and replaced bygasleftas per solidity.readthedocs.io/en/latest/…
– Lauri Peltonen
3 hours ago
Ahh yes. Thank you.
– shane
3 hours ago
Ah that makes sense. If I made a require to check the msg.value >= 10% of tx.gasprice, would that work? Would there be discrepancies between generating the web3 function call price + value and the contract value?
– Jaren L
27 mins ago
add a comment |
2
Psst,msg.gashas been removed and replaced bygasleftas per solidity.readthedocs.io/en/latest/…
– Lauri Peltonen
3 hours ago
Ahh yes. Thank you.
– shane
3 hours ago
Ah that makes sense. If I made a require to check the msg.value >= 10% of tx.gasprice, would that work? Would there be discrepancies between generating the web3 function call price + value and the contract value?
– Jaren L
27 mins ago
2
2
Psst,
msg.gas has been removed and replaced by gasleft as per solidity.readthedocs.io/en/latest/…– Lauri Peltonen
3 hours ago
Psst,
msg.gas has been removed and replaced by gasleft as per solidity.readthedocs.io/en/latest/…– Lauri Peltonen
3 hours ago
Ahh yes. Thank you.
– shane
3 hours ago
Ahh yes. Thank you.
– shane
3 hours ago
Ah that makes sense. If I made a require to check the msg.value >= 10% of tx.gasprice, would that work? Would there be discrepancies between generating the web3 function call price + value and the contract value?
– Jaren L
27 mins ago
Ah that makes sense. If I made a require to check the msg.value >= 10% of tx.gasprice, would that work? Would there be discrepancies between generating the web3 function call price + value and the contract value?
– Jaren L
27 mins ago
add a comment |
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