Questions tagged [rust]
Questions about the Rust programming language, the primary language used in the Substrate ecosystem.
251
questions
0
votes
1
answer
17
views
MultiAddress to Address String
I am trying to obtain the author address as a string. I have obtained the MultiAdress, as the following code:-
let validator_address = if let Some(author_multi_address) = multi_address {
if let ...
- 157
0
votes
0
answers
38
views
how to remove Mapping storage when tuple is used as input
Lets assume we have an ink! smart contract
On a vanilla Mapping
alpha: Mapping<[u8;32], Astruct>
we can use
self.alpha.remove(&somehash)
My question is this:
if we have the following ...
- 407
1
vote
1
answer
40
views
Calculate Session/Epoch time remaining
I've seen some websites display the estimated time remaining for the current session/epoch. Is there a Rust call for this? Is there a sample of that code?
- 140
0
votes
0
answers
23
views
Rust Compile Error: Unresolved imports crate::pallet, crate::types::Types::Config
I am working on a Rust project where I have multiple modules. I'm facing an issue with unresolved imports when I try to compile my code. Here's the relevant code structure:
types.rs
pub mod Types {
...
- 795
2
votes
1
answer
87
views
Is it permissible to retrieve the value of a private field within a struct from one pallet while working with another pallet?
I am developing a cross-chain NFT transfer pallet that involves transferring both item metadata and collection metadata. To accomplish this, I need to access the data field within the ItemMetadata ...
- 297
0
votes
1
answer
29
views
Deriving Contract Reference from `ink::trait_definition`
Is it possible to create a Contract Reference to perform a Cross-Contract call from ink::trait_definition?
If it is, how can I do so?
If it is not, why it is not possible? It seems strange that we can ...
- 63
0
votes
1
answer
14
views
Get the block timestamp using subxt
I am using subxt to get the block details, including the block number, hash, parent hash, timestamp, events and the extrinsics.
I am able to find most details, except the timestamp. Is there a way to ...
- 157
1
vote
1
answer
25
views
Need help in Ink e2e tests
I need help with that code. Can anyone pls help me out ??
mod p{
#[ink(storage)]
pub struct Foobar {
/// Stores a single `bool` value on the storage.
value: ...
2
votes
1
answer
37
views
panicked at 'assertion failed: `(left == right)`
I am having a setup of relay chain and two parachains are connected to it, I was running some test cases and during that i encounter an error
thread 'test::...
- 297
1
vote
1
answer
21
views
Substrate node template build errors and rustup version
Once in a while, doing a rustup update will break the substrate node template, the challenge then becomes to identify the rustup release compatible with the latest node-template and downgrade.
is this ...
- 385
2
votes
2
answers
40
views
Incompatibility between subxt_signer and subxt
https://github.com/paritytech/subxt/blob/master/subxt/examples/tx_basic.rs
I want to call a function in my substrate pallet. I am using the
substrate-node-template
subxt
subxt_signer
use subxt::{...
- 51
2
votes
1
answer
101
views
Problem with timestamps in governance platform
I have governance platform written in ink!, where I can create poll with pollId, number of options, and with poll_start_time and poll_end_time. And this is fine.
So when poll is started I can't call ...
- 45
1
vote
1
answer
26
views
How to get and modify cross-chain asset in contract?
I am preparing to create a smart-contract on Astar using ink! programming language. The contract's main logic involves modifying the cross-chain asset USDT on the statemint chain. After going through ...
- 11
1
vote
2
answers
77
views
Reading contract value returns null
Facing an issue while trying to query for a value in my contract. The value keeps getting retuned as null with an error. However, it works fine on substrate Contracts UI
Front end Dapp :
const ...
- 119
0
votes
0
answers
30
views
Scalecodec: How can I get the equivalent of Decode in Python, instead of DecodeAll?
When using the Python script:
timestamp = ScaleDecoder.get_decoder_class('Timestamp', ScaleBytes(timestamp_bytes_array)).decode()
it seems that the decoder expects the size of the array to be exactly ...
1
vote
3
answers
45
views
How to call PSP22::approve function from Frontend
Any guidance on how to call my psp22 approve function from the front end ? This is currently how I'm doing it but it doesn't seem to give increased allowance (although its successful) :
import { ...
- 119
0
votes
1
answer
36
views
Encountered incremental compilation error
I have encountered following error from time to time while compiling substrate-node-template
error: internal compiler error: encountered incremental compilation error with mir_built(76e5305fbe3bf3e0-...
0
votes
1
answer
20
views
error: Invalid generic declaration, trait is defined with instance but generic use none
I want to make a storage for the pallet but I'm getting this error
/// The target parachains to ping.
#[pallet::storage]
pub type Targets<T:Config> = StorageValue<
_,
BoundedVec&...
- 572
1
vote
1
answer
26
views
New to Rust: Seeking Clarification on RuntimeEvent Type Resolution in Substrate-Parachain-Template
I'm a newcomer to Rust and have been working with the Substrate-Parachain-Template. So far, I've managed to get everything to compile and run without issue, which is a good start.
However, I've come ...
- 13
0
votes
3
answers
70
views
Get SS58 Address from public key
I have my hex public key, how can I convert it to an SS58 Address?
I have found the snippet to do it using PolkadotJS here: How to convert Public key (hex) to SS58 Address in JavaScript / Polkadot-JS? ...
- 4,839
3
votes
2
answers
153
views
How node and runtime are connected?
When we run a substrate client cargo run -- --dev we run a substrate-node. The business logic is defined on the pallets composed by construct_runtime! inside the runtime. So which part of the node is ...
- 131
3
votes
0
answers
80
views
Not enough data to fill buffer
When running an API function using rust, we get this error:
GenericError { reason: "Failed to get unsigned proposals: FailedToDecodeReturnValue { function: \"DKGApi_get_unsigned_proposals\&...
- 141
4
votes
2
answers
52
views
WebAssembly runtime file into ValidationCode
I have a CLI tool that gets a WebAssembly runtime file:
let validation_code_content = fs::read_to_string(path_validation_code)
.expect("Should have been able to read the validation code ...
- 4,839
3
votes
1
answer
51
views
Persistent overuse of system resources by rust-analyzer
After limiting the number jobs in order to handle the amount of resources used by rust-analyzer it keeps using all cores so my computer ends up hanged out:
In addition, I've noticed that several ...
- 136
2
votes
1
answer
37
views
Why does compiling substrate require nightly toolchain?
rustup target add wasm32-unknown-unknown --toolchain nightly
Why can't the stable toolchain be used to compile, what I beleive is the runtime to WASM? Why is nightly needed?
- 502
3
votes
2
answers
68
views
implement trait on a type
I want to implement pallet-assets on a type which is:
pub trait Config<I: 'static = ()>: Config {
type RuntimeEvent: From<Event<Self, I>> + IsType<<Self as Config>::...
- 55
3
votes
2
answers
160
views
Specialization impl does not specialize any associated items
I'm fairly new to Rust and ink! itself.
I'm trying to compile and build an extremely basic PSP22 Contract.
I get the following error when I compile & build:
(running cargo +nightly contract build)
...
- 119
2
votes
1
answer
79
views
Error while trying to run e2e rust ink! tests
Im getting the following error while trying to run e2e rust ink! smart contracts tests:
#![feature(min_specialization)] using the following command: cargo test --features e2e-tests
Im using the ...
2
votes
1
answer
91
views
How to Implement MaxEncodedLen Trait for Structs Containing Vec<u8> in Rust
i'm trying to create a blockchain runtime module using Substrate. I have defined a few data structures with the #[derive(MaxEncodedLen)] attribute, but I'm running into a problem when trying to ...
- 795
5
votes
2
answers
123
views
"ERROR: Loading of original wasm failed" after upgrading rustup
I'm getting the following error when compiling a rust ink! 4.0;
ERROR: Loading of original wasm failed
It's started happening to me after I rustup update and now my rustc versions are:
stable-...
3
votes
1
answer
99
views
Subxt - Catch Extrinsic Error
I am doing sudo call using this example Making sudo call using subxt:
let found_event = api
.tx()
.sign_and_submit_then_watch_default(&tx, &bob)
.await?
....
- 4,839
4
votes
1
answer
15
views
error[E0282]: type annotations needed --> /libp2p-noise-0.32.0/src/protocol/x25519.rs:221:45
While running this project https://github.com/jimmychu0807/substrate-offchain-worker-demo
I'm geting this error:
error[E0282]: type annotations needed --> /libp2p-noise-0.32.0/src/protocol/x25519....
- 41
4
votes
0
answers
98
views
How to solve this Failed to compact generated WASM binary.: Error(UnknownOpcode(192))
For one assignment I have run the command cargo build --release so that I can build the pallet. After that I was getting the error
After that according to this- Error Building Substrate contract Node(...
1
vote
1
answer
25
views
Calculation gives the wrong result
After doing a simple calculation in rust ink! 4.0 smart contract, the result is incorrect and doesnt match the expected result.
Here is the simple formula:
let a0_balance_mul:U256 = U256::from(...
4
votes
1
answer
32
views
Pallet generate store is deprecated how to avoid this warning and compile the code?
I am getting error in #[pallet::generate_store(pub(super) trait Store)] which is showing deprecated warning due to which I could not compile my custom pallet is there any solution
- 41
1
vote
1
answer
45
views
What is distinction between self (lowercase) and Self (uppercase) In Rust?
I am trying to fetch caller address in ink smart contract to apply some checks.
let owner = self._check_token_exists(&id)?;
let caller = Self::env().caller();
I am confused which one i should use ...
- 392
5
votes
2
answers
62
views
Trying to implement U256 in rust ink! 4.0
I've implemented use primitive_types::U256 and now I'm trying to return a U256 int as a result from one of my functions, but I'm getting the following error: the trait TypeInfo is not implemented for ...
1
vote
1
answer
45
views
Why we use empty struct named as key of particular lib name in mapping while using it in storage of openbrush libraries
When you go through the openbrush smart contract library. You will notice they are using upgradeable smart contract storage and while defining storage they are using some empty struct as key of ...
- 392
1
vote
2
answers
51
views
"the wasm*-unknown-unknown targets are not supported by default" -error while compiling ink smart contract
I am attempting to build a smart contract for an imaginary burger shop. But I keep getting this error when I run the build command.
The test compiles, and cargo check compiles successfully too.
Here ...
- 23
1
vote
1
answer
58
views
unresolved import `amiquip`
I've added new amiquip dependency in the cargo.toml
[package]
name = "sender"
version = "0.1.0"
edition = "2021"
[package.metadata.docs.rs]
targets = ["x86_64-...
- 572
3
votes
0
answers
46
views
Cargo-contract forcibly calls nightly-2022-06-30 regardless of specified toolchain
I am experiencing an issue when using cargo-contract (version 1.5.1) to build a project (command: cargo +nightly contract build). The specified toolchain is not being recognized, and the process is ...
- 31
3
votes
1
answer
29
views
Prevent unused imports from bloating up runtime wasm
I recently wrote a pallet that uses a (non-substrate) Rust crate as a dependency.
This crate conveniently supports no-std and Wasm, but it is also quite extensive and there's a lot of code that my ...
- 1,667
1
vote
1
answer
47
views
the trait bound `Vec<u8>: EncodeLike<u32>` is not satisfied
I was making a function to store the some data in the pallet.
#[pallet::storage]
#[pallet::getter(fn number)]
// Learn more about declaring storage items:
// https://docs.substrate.io/main-docs/build/...
- 572
2
votes
1
answer
94
views
How can I decode this error message {"ok":{"flags":["Revert"],"data":"0x000110"}}?
I'm using polkadotjs to call my ink! smart contracts and I seem to be having trouble with calls that require parameters. For the call below I am getting the revert flag {"ok":{"flags&...
2
votes
0
answers
58
views
Failed to compact generated WASM binary in substrate standalone chain [duplicate]
I'm building the substrate standalone chain with this cargo build --release command and facing the issue:
thread 'main' panicked at 'Failed to compact generated WASM binary.: Error(UnknownOpcode(192))...
1
vote
1
answer
48
views
Creator NFT Royalties on substrate-based blockchains possible?
Coming over from the Ethereum ecosystem and haven't been able to find much information about integrating creator royalties into ERC721 contracts using rust or ink!. I know on Ethereum, the large ...
0
votes
1
answer
33
views
How to deploy smart contract in ink which constructor takes value in params
I have written an erc20 smart contract in ink(Rust). The contract has been compiled successfully. But I got an error while deploying my smart contract. Basically, the contract constructor takes ...
1
vote
3
answers
112
views
Unable to deploy the open-brush contracts build using toolchain nightly-2023-02-07 on substrate node
As you can see in following link . I was not able to build contract using latest rust nighly ( rustc 1.70.0-nightly (17c116721 2023-03-29)) toolchain.
ERROR: Loading of original wasm failed
I got the ...
- 392
4
votes
1
answer
65
views
How to parse an ss58 address in no_std rust
In another question
How do I work with SS58 encoded addresses? the same question was addressed, this is however about how to do it without the std lib.
How to convert an ss58 stored in a String to an ...
- 929
4
votes
2
answers
83
views
Problem with Vec using ink
I'm trying to make some changes to the Flipper contract, trying to use a vector like the documentation say's it should be imported:
#[ink::contract]
pub mod flipper_plus {
use ink::storage::...
