Questions tagged [smart-contract]
Everything smart contract related, either WASM or EVM based.
271
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unable to map abi string to array to object with known keys source, contract
I am trying to use the ContractPromise from @polkadot/api-contract to interact with a published smart contract on the moonriver network but when I try and create a new ContractPromise object I get the ...
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2
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1
answer
144
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How to get contract's code owner
Can the information about the owner of the actual contract code blob (the account that deployed the code) be accessed from the contract environment?
- 331
3
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1
answer
73
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Getting ink! contract metadata from the chain
I am playing around with ink! and invoking contract pallets. After uploading the contract to the chain from the polkadot extension, I get a JSON file back describing the metadata for the contract, ...
- 277
2
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2
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97
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How to receive multiple parameters of different types in chain extension
As ink chain-extension example https://github.com/paritytech/ink/blob/master/examples/rand-extension/runtime/chain-extension-example.rs#L32 .
It show how to receive one param.
But if I want receive ...
- 21
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36
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How to run multiple Integration tests at once in Redspot Ink!
I am currently writing integration tests for my contracts using redspot, I can't seem to run all my integration tests at once, I can only run integration test by using the keyword it.only. Anytime I ...
- 419
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64
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How to Send Additional Text Payload to Contract?
I need to send a string of a digit and a letter like "2F" to a contract deployed on a running contracts node. This payload is to be processed in the contract then.
How can I include ...
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3
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1
answer
201
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How can I determine the native Balance of an Account/Address in Ink!
One can know the contract's native balance by using ink_env::balance()
But, How can one know the native balance of a particular address/account in ink?
For example, knowing the native balance of Alice,...
- 419
2
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2
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285
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Manipulate block timestamp for ink! integration tests?
I'm using redspot for integration tests. I have some contracts features involving with block timestamp. How can I manipulate the block timestamp in substrate-contracts-node?
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3
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240
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Are there blockchains based on substrates that use smart contracts and are on mainnet?
I'd like to know if there's a chain that smart contract is being in mainnet use of it.
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3
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325
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cargo contract throws error about supplied arguments in ` #[ink(constructor)]` for version 3.0.1
In my smart contract, all the ink dependencies are set to =3.0.1 because of this issue:
Cargo contract 3.0.1
When I tried to execute the cargo contract build or even cargo +nightly contract build to ...
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1
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112
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How to receive input for mocked ink_env::test::ChainExtension
I'm trying to write an off-chain test for an ink! smart-contract that uses chain extensions. The example showing how to mock an extension for tests is never using the supplied _input argument.
The ...
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95
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Build Issues when implementing PSP22 token standard for ink! contract
I am trying to implement the PSP22 token standard but getting errors when building my contract.
The errors are:
#[brush::contract]
| ^^^^^^^^^^^^^^^^^^ use of undeclared crate or module ...
- 419
7
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1
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128
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Is the WASM blob created from ink! contract always deterministic
The contract's source code is provided during the contract verification on a block explorer (or some other source verifier).
The block explorer needs to compile that source and verify if the generated ...
- 659
1
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1
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83
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Outdated contract-api documentation
Trying to follow these examples:
https://polkadot.js.org/docs/api-contract/start/code#create-a-blueprint
which fails with:
createBlueprint is not a function
Seems like the examples in the ...
- 331
4
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263
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What is the best way to make a cross contract call on Ink!
I found 2 ways to make cross contract calls on ink!.
The first is in this link here where another contract is called directly,
The second is in this link here where a reference(ref) is being used.
I ...
- 419
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1
answer
150
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Instantiating and Calling a contract using the Contracts Pallet
I find myself needing to do two things with the Contracts pallet, which each raise a question:
I want to call the instantiate_with_code extrinsic from another Rust function.
What is the correct way ...
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4
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1
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121
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cargo-contract throws on a valid WS URl
Most recent version (v1.3.0) of cargo-contract does not parse a valid WS url:
cargo +nightly contract upload --suri '//Alice' --url 'wss://ws-smartnet.test.azero.dev:443'
ERROR: Rpc error: Networking ...
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1
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1
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231
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Make token/nft transfer within smart contract
I want to make token/nft transfer inside smart contracts.
I saw some examples of token transfers and taking that reference, I tried to replicate something similar to that. here is the code.
#![no_std]
...
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1
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1
answer
34
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Non-uint256 TokenID for 721/1155 NFTs? (arbitrary var types)
I'm using an InkLang implementation for 721Light/1155 (undecided)
For my purpose, the contract is offering domain-like NFTs. So an infinite amount of IDs, but a max balance of 1 for any ID.
From what ...
- 11
0
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1
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163
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Ink contract deployment out of gas [duplicate]
When deploying a smart contract on local-net, polkadot.js fails with:
system.ExtrinsicFailed, contracts.OutOfGas
This seems to be due to having the following enum in the contract storage:
#[cfg_attr(...
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3
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1
answer
301
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Ink cannot derive SpreadLayout and SpreadAllocate for simple struct and enum
When developing Ink! smart contracts I found that SpreadLayout and SpreadAllocate cannot be derived for simple structs or enums that are members variables of the contract and I have to implement the ...
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2
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206
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How to iterate over Mapping<K,V>?
I have a very basic question - ink! now has a Mapping struct for key-value pairs. It seems it does not implement the Iterator trait?
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1
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27
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Is it feasible to modify the contracts pallet to integrate it into a non-substrate rust-based blockchain?
Is it feasible to modify the contracts pallet to integrate it into a non-substrate rust-based blockchain? Say one that runs on Tendermint.
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54
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Are there any tools available for creating a mock version of a contract in JS/TS?
Currently, we use "live" versions of our contracts running on a substrate contracts node in our JavaScript tests. This makes them integration tests and difficult to include in simple GitHub ...
- 1,462
3
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2
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485
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Panic in Ink! Smart Contracts
I want to find out how exactly "revert" works in ink! smart contracts:
What happen if we panic!() in ink! contracts? IIRC we shouldn't use panic!() in runtime.
Is there any difference ...
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2
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1
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177
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Rust ink! Utc::now() from chrono libary returns : function or associated item not found in `chrono::Utc'
as the title suggests.
I imported chrono 0.4 just like in the documentation Here
And when i ever i call Utc::now() to get current UTC time, i get error that the function now() doesn't not exists.
Here ...
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1
answer
101
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Standards for PSP34 thumbnail/image and resource url?
Are there some standard attributes to use for URLs for images and other meta-information on PSP-34?
I see that RMRK has that but it is only on Kusama.
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3
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1
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148
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Contract call returns error "Found input with 28 bits, expected 8". Polkadot.js and ink contracts
as the title suggest, Im trying to call PSP22 token contract and read balanceOf() function, but i get error that im passing a too big of a input (27 instead of 8)
Im trying to invoke balanceOf() PSP22 ...
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114
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Ink! ink_env::debug_println! does not work if message is payable
Adding #[ink(payable)] to a #[ink(message)] prevents ink_env::debug_println! messages to be logged in console when executing the smart contract call.
Any additional config needed in this case to have ...
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2
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1
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158
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Can we mint/burn Statemint assets on other parachains?
My goal is to create an interoperable NFT collection in the Polkadot native ecosystem and allow its holders to interact with it on a parachain's smart contract. In that smart contract, the holder can ...
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1
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95
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Can we write bridge smart contract using ink?
I was reading about ink smart contracts and was curious is it possible to make bridge using ink, as there is already parity-common-bridges present. It would be very helpful if someone knows about this ...
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229
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Parsing JSON in ink based Smart Contracts
Currently I am developing a Fat Contract (Native to Phala Network) that also supports Ink Based Smart Contracts to be written within the Fat Contracts which is what my example is doing.
To describe ...
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How to retrieve dynamic type size data from chain extension in ink? [duplicate]
my example looks like this :
#[ink(extension = 1111]
fn asset_name(asset_id: u32) -> Result<[u8], PalletAssetErr>
or this
fn asset_name(asset_id: u32) -> Result<[u8], PalletAssetErr>...
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1
vote
1
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112
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Fetch storage data and convert it to primitive types with subxt
I want to get the bool value from the flipper contract. I use Rust and subxt. But I cannot convert it to a primitive type.
let value: bool = api
.metadata()
.pallet("...
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3
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144
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How do I find the gas consumed by a contracts extrinsic?
I am querying extrinsic data and I am able to fetch gasLimit and gasPrice out of Extrinsic.method.args. But how do I fetch the amount of gas used from an extrinsic?
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How to enable chain extensions?
I have a chain extension implemented on substrate-contracts-node and in my ink! smart contract according to this tutorial. When I try to instantiate my contract on a local contracts-ui I get the ...
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2
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141
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How do I get the code hash of a smart contract using Polkadot{.js} API?
I know polkadot{.js} has an API to access contract storage here:
https://polkadot.js.org/docs/substrate/storage#contracts
How do I get the code hash via the account?
- 8,140
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1
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162
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How to call runtime functions from a contract
A chain_extension is one way to call into the runtime from a smart contract on the contracts pallet.
What other methods exist, and why might you use them instead of the extension pattern?
- 1,707
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1
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89
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How to return error from chain extension?
I saw how to handle error from chain extension on smart contract side
https://paritytech.github.io/ink-docs/macros-attributes/chain-extension#error-code
But I can't find example
and can't understand ...
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5
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1
answer
100
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How to benchmark a chain extension?
I would like to know the recommended way to benchmark a chain extension, and then how to charge the calculated weight. According to this document, we need to write benchmarks.
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68
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Is there a substrate node that contains pallet-contracts and uses instant seal consensus?
I've seen instant seal mentioned as a way to get transactions sealed by the substrate node upon receipt.
I also know that moonbeam have this in their node.
Is there a substrate node that includes ...
- 1,462
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97
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How to access environmental information about a contract from within a chain extension?
When we have an Ink! smart contract code calling a chain extension, how do we receive this information from within the chain extension:
The calling smart contract address/ID
The original caller of ...
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560
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How to have a mapping in a custom structure inside an ink! contract?
I'm a newbie with rust and substrate. I'm currently trying to build a PSP34 compatible smart contract (NFT) for documents. In this contract, I'd like to have the following structure:
#[derive(Default, ...
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11
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2
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183
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Wasm interpreter in pallet-contracts
I have a question about how pallet-contracts interprets a Wasm contract. Are the following assumptions correct?
pallet-contracts interprets contracts through the simple wasmi interpreter
gas metering ...
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3
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2
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143
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How to get AccountId from compressed public key in an ink! contract?
I'm trying to do the signature verification in an ink! contract. I'm using ink_env::ecdsa_recover for this purpose.
It is returning Compressed Public Key of type [u8; 33].
I have the AccountId of the ...
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9
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1
answer
73
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Incorrect display name for smart contracts numeric return types
When I deploy an ERC20 on Polkadot JS Apps, i can see that the return type of total_supply is u128, however according to the contract metadata it should display Balance.
Noticed also for ERC1155 ...
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8
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92
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Performance of same logic with a contract using pallet-contracts vs. a native pallet (excluding metering)
I'm wondering what is current state of the art of Substrate's pallet-contracts performance as compared to the same functional implementation as a pallet.
I acknowledge that different logic can have ...
- 539
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2
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192
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How do I test a chain extension used in the runtime?
I am aware of this example that shows how to create a mock chain extension and test that. However, I do not know how to test the chain extension that is used by the runtime and calling functions from ...
- 206
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4
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1k
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How to resolve duplicate lang item error?
I couldn't compile ink_env when doing cargo contract build. Tried cargo update by referencing this other [post] (error: duplicate lang item in crate `std` (which `arrayvec` depends on): `panic_impl`). ...
10
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3
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368
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Why is it a bad idea to use String in an ink! smart contract?
I've heard that it is a bad idea to use Rust's String type in an ink! smart contract.
Why is this so? And what is your recommendation to use instead for typical use cases of String ‒ so parsing input ...
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