Questions tagged [no-std]
The no-std tag has no usage guidance.
24
questions
3
votes
1
answer
40
views
Is there a way to use a crate that depends on the `std` in substrate OCW?
from what I've learned so far, the OCW is designed specifically for executing heavy and time-consuming computations outside of the runtime. As the OCW is not a part of runtime/wasm, I guess the OCW ...
- 197
1
vote
1
answer
172
views
Why is serde always std-gated in substrate?
I regularly see serde implemented for various structs across the substrate ecosystem, usually in the single-liner form below. Why is that gated behind the std feature? In serde's documentation, it's ...
- 418
0
votes
1
answer
67
views
Bech32 encode/decode library for no_std to convert bytes32 into string address in runtime pallet?
I want to convert bytes into string address.
I have only two options because of Junction limitation: bytes32 or bytes20.
pub enum Junction {
...
AccountId32 { network: Option<NetworkId>, ...
- 529
2
votes
2
answers
100
views
Calling std-based host function from a pallet
Based on:
Use std only rust library to extend substrate runtime interface？
How to understand [runtime-interface] and `Externalities`?
I understand that I should be able to:
have a crate that is not ...
- 269
4
votes
1
answer
114
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 ...
- 1,201
2
votes
1
answer
39
views
Why not implement the sp_std::fmt::Debug for AccountId32 in non-std
https://github.com/paritytech/substrate/blob/d443f148ce0aa6a51798b86c6b3ae54113786f94/primitives/core/src/crypto.rs#L584-L595
Why not implement the sp_std::fmt::Debug for AccountId32 in non-std like ...
- 21
5
votes
0
answers
197
views
How to check if a pallet can be compiled to no-std/WASM?
How to check if a pallet can be compiled to no-std/WASM?
I ran:
cargo build --no-default-features --target wasm32-unknown-unknown
But this didn't work. IIUC, we need some ENV to build the pallet to ...
- 10.8k
1
vote
1
answer
111
views
Why `features = ["std"]` is not necessary in the `[dev-dependencies]` some crates like `sp-io`?
We often use some basic substrate crates such as sp-core, and sp-io while doing pallet tests. In general, those dependencies are put under [dev-dependencies]. But I have an issue with whether we ...
- 703
1
vote
1
answer
33
views
Using Valico JSON validator in my pallet
Currently I have problem that Valico is using std based packages like serde and serde_json. Is there any workaround to use this package?
UPDATE1:
I managed to fork repo and fix some dependencies but ...
- 11
0
votes
0
answers
41
views
How to TRACE "duplicated lang item in crate std: ..."
I have an error of duplicated std, I know there is a lot of questions with the same problem, that's why I'm asking how to search for the problem.
I basically have an error of this form (I'm trying to ...
- 454
0
votes
1
answer
44
views
fail to use a no_std friendly dependence in smart contract
I try to use barebones-x509 which is no_std friendly to parse x509 certificate. But encounter the mistake. Will you have some advice?
error: duplicate lang item in crate `std` (which `barebones_x509` ...
0
votes
2
answers
125
views
How to set timestamp in benchmarks?
Is it possible to use std for benchmarks? If not, how can I get timestamps in a benchmark?
I tried using this but it didn't compile:
#[cfg(feature = "runtime-benchmarks")] extern crate std;...
- 540
0
votes
1
answer
57
views
Use std only rust library to extend substrate runtime interface？
I have some rust libraries and they have don't have a no_std implementation.
Can I use runtime interface to call those libraries？
3
votes
2
answers
73
views
Get results of some std operations in benchmarks
We faced a situation the other day where we needed some result of std operations inside of our benchmarks. Specifically, we were looking to generate key pairs and signatures from types given by ...
- 556
2
votes
1
answer
2k
views
error: `#[panic_handler]` function required, but not found
I'm trying to add Substrate to my project and am encountering this error when trying to compile. Do I need to set this explicitly somewhere in my runtime? I see there is an implementation in sp_io but ...
