chore(deps): bump subxt from 0.41.0 to 0.42.1

[dependabot]

Bumps subxt from 0.41.0 to 0.42.1.

Release notes

Sourced from subxt's releases.

v0.42.1

[0.42.1] - 2025-05-12

This patch release reduces the rust-version to 1.85.0, given that we don't use any features newer than this at the moment.

v0.42.0

[0.42.0] - 2025-05-09

The primary benefit of this release is introducing support for the about-to-be-stabilised-in-polkadot-sdk V16 metadata, and with that, support for calling Pallet View Functions on runtimes which will support this. Pallet View Functions are used much like Runtime APIs, except that they are declared in specific pallets and not declared at the runtime-wide level, allowing pallets to carry their own APIs with them.

Pallet View Functions

Calling a Pallet View Function in this Subxt release will look like:

use runtime::proxy::view_functions::check_permissions::{Call, ProxyType};
// Construct the call, providing the two arguments.
let view_function_call = runtime::view_functions()
.proxy()
.check_permissions(
Call::System(runtime::system::Call::remark { remark: b"hi".to_vec() }),
ProxyType::Any
);
// Submit the call and get back a result.
let _is_call_allowed = api
.view_functions()
.at_latest()
.await?
.call(view_function_call)
.await?;

Like Runtime APIs and others, the dynamic API can also be used to call into Pallet View Functions, which has the advantage of not needing the statically generated interface, but the downside of not being strongly typed. This looks like the following:

use scale_value::value;
let metadata = api.metadata();
// Look up the query ID for the View Function in the node metadata:
let query_id = metadata
.pallet_by_name("Proxy")
.unwrap()
.view_function_by_name("check_permissions")
.unwrap()
.query_id();
// Construct the call, providing the two arguments.
</tr></table>

... (truncated)

Changelog

Sourced from subxt's changelog.

[0.42.1] - 2025-05-12

This patch release reduces the rust-version to 1.85.0, given that we don't use any features newer than this at the moment.

[0.42.0] - 2025-05-09

The primary benefit of this release is introducing support for the about-to-be-stabilised-in-polkadot-sdk V16 metadata, and with that, support for calling Pallet View Functions on runtimes which will support this. Pallet View Functions are used much like Runtime APIs, except that they are declared in specific pallets and not declared at the runtime-wide level, allowing pallets to carry their own APIs with them.

Pallet View Functions

Calling a Pallet View Function in this Subxt release will look like:

use runtime::proxy::view_functions::check_permissions::{Call, ProxyType};
// Construct the call, providing the two arguments.
let view_function_call = runtime::view_functions()
.proxy()
.check_permissions(
Call::System(runtime::system::Call::remark { remark: b"hi".to_vec() }),
ProxyType::Any
);
// Submit the call and get back a result.
let _is_call_allowed = api
.view_functions()
.at_latest()
.await?
.call(view_function_call)
.await?;

Like Runtime APIs and others, the dynamic API can also be used to call into Pallet View Functions, which has the advantage of not needing the statically generated interface, but the downside of not being strongly typed. This looks like the following:

use scale_value::value;
let metadata = api.metadata();
// Look up the query ID for the View Function in the node metadata:
let query_id = metadata
.pallet_by_name("Proxy")
.unwrap()
.view_function_by_name("check_permissions")
.unwrap()
.query_id();
// Construct the call, providing the two arguments.
let view_function_call = subxt::dynamic::view_function_call(
*query_id,
</tr></table>

... (truncated)

Commits

• 0473cfd Prep to release 0.42.1: Reduce rust-version to Rustc 1.85.0 (#2005)
• f8c333f Update release notes to include strip-metadata util
• 77f8355 Actually bump Cargo.toml to 0.42.0
• 7de8d36 Prep to release v0.42.0 (#2003)
• 23c62f3 Update to 2024 edition (#2001)
• 98c1d15 Update Smoldot to latest version (#1991)
• a033076 Update native test timeout to 45 mins (#2002)
• 411a807 chore: fix some typos (#1997)
• 9ba89e3 Support v16 metadata and use it by default if it's available (#1999)
• 4524590 Metadata V16: Implement support for Pallet View Functions (#1981)
• Additional commits viewable in compare view

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[seadanda]

@dependabot rebase

[sigurpol]

I will bump it manually once I update the metadata to deal with the pallet renaming. There is a breaking change in 0.42 vs 0.41 related to the hasher function that needs to be handled, that's why this PR fails.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.