The [wasmtime v37
release](https://github.com/bytecodealliance/wasmtime/releases/tag/v37.0.0)
"now fully implements the WebAssembly exception-handling proposal."
Support for exception-handling is disabled by default, but will be made
default in the future (according to the release notes).
To use this new wasmtime feature, we do two things at a high level:
1. Update wasmtime dependency to version 37
2. Add a "wasmtime-exceptions" Extism feature, disabled by default.
Updating to the new wasmtime dependency required some semantical changes
to how the cache is configured.
There is also a new `ExternType` to match on when handling invalid
imports.
My use case for this feature is being able to execute Lua code from
Extism. In actuality, I'm running a Rust plugin, which is using
[mlua](https://github.com/mlua-rs/mlua) to execute the Lua. I have it
working locally with this change. Fwiw, mlua recently added [support to
compile to wasi](https://github.com/mlua-rs/mlua/issues/366), which
should make this all work end-to-end with no special patches if we can
get this merged.
This is my first time working on the Extism codebase, so please let me
know if I missed anything.
Updates the requirements on
[criterion](https://github.com/bheisler/criterion.rs) to permit the
latest version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/bheisler/criterion.rs/blob/master/CHANGELOG.md">criterion's
changelog</a>.</em></p>
<blockquote>
<h2>[0.7.0] - 2025-07-25</h2>
<ul>
<li>Bump version of criterion-plot to align dependencies.</li>
</ul>
<h2>[0.6.0] - 2025-05-17</h2>
<h3>Changed</h3>
<ul>
<li>MSRV bumped to 1.80</li>
<li>The <code>real_blackbox</code> feature no longer has any impact.
Criterion always uses <code>std::hint::black_box()</code> now.
Users of <code>criterion::black_box()</code> should switch to
<code>std::hint::black_box()</code>.</li>
<li><code>clap</code> dependency unpinned.</li>
</ul>
<h3>Fixed</h3>
<ul>
<li>gnuplot version is now correctly detected when using certain Windows
binaries/configurations that used to fail</li>
</ul>
<h3>Added</h3>
<ul>
<li>Async benchmarking with Tokio may be done via a
<code>tokio::runtime::Handle</code>, not only a
<code>tokio::runtime::Runtime</code></li>
</ul>
<h2>[0.5.1] - 2023-05-26</h2>
<h3>Fixed</h3>
<ul>
<li>Quick mode (--quick) no longer crashes with measured times over 5
seconds when --noplot is not active</li>
</ul>
<h2>[0.5.0] - 2023-05-23</h2>
<h3>Changed</h3>
<ul>
<li>Replaced lazy_static dependency with once_cell</li>
<li>Improved documentation of the <code>html_reports</code> feature</li>
<li>Replaced atty dependency with is-terminal</li>
<li>MSRV bumped to 1.64</li>
<li>Upgraded clap dependency to v4</li>
<li>Upgraded tempfile dependency to v3.5.0</li>
</ul>
<h3>Fixed</h3>
<ul>
<li>Quick mode (<code>--quick</code>) no longer outputs 1ms for measured
times over 5 seconds</li>
<li>Documentation updates</li>
</ul>
<h2>[0.4.0] - 2022-09-10</h2>
<h3>Removed</h3>
<ul>
<li>The <code>Criterion::can_plot</code> function has been removed.</li>
<li>The <code>Criterion::bench_function_over_inputs</code> function has
been removed.</li>
<li>The <code>Criterion::bench_functions</code> function has been
removed.</li>
<li>The <code>Criterion::bench</code> function has been removed.</li>
</ul>
<h3>Changed</h3>
<ul>
<li>HTML report hidden behind non-default feature flag:
'html_reports'</li>
<li>Standalone support (ie without cargo-criterion) feature flag:
'cargo_bench_support'</li>
<li>MSRV bumped to 1.57</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
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<li><a
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release: bump criterion and criterion-plot versions (<a
href="https://redirect.github.com/bheisler/criterion.rs/issues/878">#878</a>)</li>
<li><a
href="ccccbcc152"><code>ccccbcc</code></a>
fix: deal with throughput in bits (<a
href="https://redirect.github.com/bheisler/criterion.rs/issues/861">#861</a>)</li>
<li><a
href="deb0eb021d"><code>deb0eb0</code></a>
feat: support throughput reports in bits (<a
href="https://redirect.github.com/bheisler/criterion.rs/issues/833">#833</a>)</li>
<li><a
href="d4fd7cc478"><code>d4fd7cc</code></a>
Add CI job checking library builds with oldest allowed dependencies (<a
href="https://redirect.github.com/bheisler/criterion.rs/issues/854">#854</a>)</li>
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Updates the requirements on [toml](https://github.com/toml-rs/toml) to
permit the latest version.
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This PR makes it possible to disable all default dependencies for wasmtime
---------
Co-authored-by: zach <zachshipko@gmail.com>
Co-authored-by: zach <zach@dylibso.com>
This wrapper caches the result of `plugin.function_exists`, to avoid
having to load a plugin from the pool every single time just to find out
if the given function exists. It can improve performance if there are
many plugin hooks without corresponding plugin functions.
---------
Co-authored-by: zach <zach@dylibso.com>
Updates the requirements on [prost](https://github.com/tokio-rs/prost)
to permit the latest version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/tokio-rs/prost/blob/master/CHANGELOG.md">prost's
changelog</a>.</em></p>
<blockquote>
<h1>Prost version 0.14.1</h1>
<p><em>PROST!</em> is a <a
href="https://developers.google.com/protocol-buffers/">Protocol
Buffers</a> implementation for the <a
href="https://www.rust-lang.org/">Rust Language</a>. <code>prost</code>
generates simple, idiomatic Rust code from <code>proto2</code> and
<code>proto3</code> files.</p>
<h2>⚠️ Revert emission of <code>rerun</code> commands</h2>
<p>Version 0.14.1 reverts the emission of <code>rerun</code> commands.
Other than this change, it is identical to 0.14.0.</p>
<p>In version 0.14.0, <code>prost-build</code> began emitting
<code>rerun</code> commands. While intended to improve build
correctness, this change caused regressions for some users—for example,
those generating <code>protos</code> from an <code>includes</code>
directory. These edge cases are difficult to address reliably, so the
change has been rolled back in 0.14.1.</p>
<p>For more details, see [issue <a
href="https://redirect.github.com/tokio-rs/prost/issues/1296">#1296</a>](<a
href="https://redirect.github.com/tokio-rs/prost/issues/1296">tokio-rs/prost#1296</a>).</p>
<h2>Breaking changes</h2>
<ul>
<li>
<p>prost: Relax Message Debug trait bound (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1147">#1147</a>)</p>
<p>BREAKING CHANGE: <code>trait Debug</code> was a supertrait of
<code>trait Message</code>. This is no longer required by
<code>prost</code>. If your code relies on <code>trait Debug</code>
being implemented for every <code>impl Message</code>, you must now
explicitly state that you require both Debug and Message. For example:
<code>where M: Debug + Message</code></p>
</li>
<li>
<p>prost: Remove prost-derive feature (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1247">#1247</a>)</p>
<p>BREAKING CHANGE: Feature flag <code>prost-derive</code> is renamed to
<code>derive</code>. Please rename any usage of
<code>prost-derive</code> feature in your <code>Cargo.toml</code>.</p>
</li>
<li>
<p>prost-build: Prevent repeated fields to be boxed (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1237">#1237</a>)</p>
<p>BREAKING CHANGE: A repeated field that is manually marked as boxed
was typed as <code>Vec<Box<T>></code>. Those fields are now
simply typed as <code>Vec<T></code> to prevent double indirection.
The <code>boxed</code> configuration is effectively ignored for repeated
fields.</p>
</li>
<li>
<p>prost-build: Make <code>type_name_domain</code> cumulative (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1228">#1228</a>)</p>
<p>BREAKING CHANGE: The configuration for domain names of messages is
now cumulative. All calls to
<code>prost_build::Config::type_name_domain</code> are now concatenated.
The previous behavior was that only the arguments of the last call were
used. If you do multiple calls to type_name_domain, you need to remove
all but the last call to maintain the same behavior.</p>
</li>
<li>
<p>prost-build: Derive Eq and Hash trait for messages where possible (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1175">#1175</a>)</p>
<p>BREAKING CHANGE: <code>prost-build</code> will automatically derive
<code>trait Eq</code> and <code>trait Hash</code> for types where all
field support those as well. If you manually <code>impl Eq</code> and/or
<code>impl Hash</code> for generated types, then you need to remove the
manual implementation. If you use <code>type_attribute</code> to
<code>derive(Eq)</code> and/or <code>derive(Hash)</code>, then you need
to remove those.</p>
</li>
</ul>
<h2>Features</h2>
<ul>
<li>prost-types: Implement conversion <code>Duration</code> to/from
<code>chrono::TimeDelta</code> (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1236">#1236</a>)</li>
<li>prost-build: Prepare for 2024 keyword <code>gen</code> (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1257">#1257</a>)</li>
</ul>
<h2>Dependencies</h2>
<ul>
<li><em>(deps)</em> Update pulldown-cmark to 0.13 (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1259">#1259</a>)</li>
<li><em>(deps)</em> update criterion requirement from 0.5 to 0.6 (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1280">#1280</a>)</li>
</ul>
<h2>Documentation</h2>
<ul>
<li>Update dead link LICENSE in <code>prost-types/README.md</code> (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1262">#1262</a>)</li>
</ul>
<h2>Styling</h2>
<ul>
<li>Use DoubleEndedIterator::next_back (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1255">#1255</a>)</li>
<li>Fix typo (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1260">#1260</a>)</li>
</ul>
<!-- raw HTML omitted -->
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chore: Release version 0.14.1 (<a
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<li><a
href="0caca2977d"><code>0caca29</code></a>
Revert "feat(prost-build): emit <code>rerun</code> commands (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1140">#1140</a>)"
(<a
href="https://redirect.github.com/tokio-rs/prost/issues/1297">#1297</a>)</li>
<li><a
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chore: Release version 0.14.0 (<a
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<li><a
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build(deps): update criterion requirement from 0.5 to 0.6 (<a
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<li><a
href="bdd03fcb8d"><code>bdd03fc</code></a>
Update config.rs (<a
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<li><a
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<li><a
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docs: update dead link LICENSE in <code>prost-types/README.md</code> (<a
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<li><a
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href="https://redirect.github.com/tokio-rs/prost/issues/1260">#1260</a>)</li>
<li><a
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build(deps): Update pulldown-cmark to 0.13 (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1259">#1259</a>)</li>
<li><a
href="db871b4e71"><code>db871b4</code></a>
harden <code>ref mut</code> according to edition 2024 (<a
href="https://redirect.github.com/tokio-rs/prost/issues/1248">#1248</a>)</li>
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Hello,
I encountered an error when trying to enable caching in my project, I
could not compile any Plugins due to a bad configuration file used by
the wasmtime crate (`failed to parse config file`). I managed to find
understand the error after seeing [some changes made by
wasmtime](https://github.com/bytecodealliance/wasmtime/pull/10859) and
its documentation. I was simply missing the `enabled` key from the
configuration, that has been removed from `wasmtime` (and its [cache
sister
crate](https://github.com/bytecodealliance/wasmtime/tree/main/crates/cache)).
So I added more information in the README regarding this specific issue,
and some extra behaviour that I noticed would happen regarding caching
configuration.
Hopefully this is helpful!
It seems like at some point we changed the `release.yml` workflow to
create multiple artifacts instead of one `release-artifacts` tarball. I
changed the .NET Nuget workflow to be more like Python
Updates the requirements on
[cbindgen](https://github.com/mozilla/cbindgen) to permit the latest
version.
<details>
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<blockquote>
<h1>0.29.0</h1>
<ul>
<li>Support no-export annotation for statics and functions.</li>
<li>Fixed conditional fields of constexpr literal structs</li>
<li>Add rename rule for generated associated constant</li>
<li>Upgrade heck to 0.5</li>
<li>Add support for an optional nullable attribute</li>
<li>docs.md: Fix deprecated_with_note and deprecated_variant_with_note
being spelled as 'notes'</li>
<li>Fix generic with "void" default</li>
<li>Fixed error generation of structures using the keyword as inside
arrays</li>
<li>Added test for unsafe(no_mangle) attribute</li>
<li>Fixed handling of trait methods containing the unsafe attribute</li>
<li>Rename -Zparse-only</li>
</ul>
<h1>0.28.0</h1>
<ul>
<li>Parse unsafe attributes in <a
href="https://redirect.github.com/mozilla/cbindgen/pull/1020">mozilla/cbindgen#1020</a></li>
<li>Fix local override of enum prefix-with-name by jsgf in <a
href="https://redirect.github.com/mozilla/cbindgen/pull/1006">mozilla/cbindgen#1006</a></li>
<li>Add rename-all=prefix in <a
href="https://redirect.github.com/mozilla/cbindgen/pull/1021">mozilla/cbindgen#1021</a></li>
<li>ir: add support for UnsafeCell and SyncUnsafeCell by alekitto in <a
href="https://redirect.github.com/mozilla/cbindgen/pull/1003">mozilla/cbindgen#1003</a></li>
<li>Implement mangling for arrays in <a
href="https://redirect.github.com/mozilla/cbindgen/pull/1022">mozilla/cbindgen#1022</a></li>
<li>Fix: Ignore <code>CARGO_BUILD_TARGET</code> in tests by bryango in
<a
href="https://redirect.github.com/mozilla/cbindgen/pull/1010">mozilla/cbindgen#1010</a></li>
<li>Newline for each field for constexpr field constants by youknowone
in <a
href="https://redirect.github.com/mozilla/cbindgen/pull/988">mozilla/cbindgen#988</a></li>
<li>Fix clippy warnings by youknowone in <a
href="https://redirect.github.com/mozilla/cbindgen/pull/1026">mozilla/cbindgen#1026</a></li>
<li>Add aarch64/arm64 to CI by NickeZ in <a
href="https://redirect.github.com/mozilla/cbindgen/pull/1036">mozilla/cbindgen#1036</a></li>
<li>Add <code>unstable_ir</code> feature flag that makes the ir pub by
heesooy in <a
href="https://redirect.github.com/mozilla/cbindgen/pull/1011">mozilla/cbindgen#1011</a></li>
<li>Support generated a symbols file by TheElectronWill in <a
href="https://redirect.github.com/mozilla/cbindgen/pull/916">mozilla/cbindgen#916</a></li>
</ul>
<h1>0.27.0</h1>
<ul>
<li>Revert: The <code>Config</code> struct now has a private
member.</li>
<li>Allow users to specify a crate version for bindings generation (<a
href="https://redirect.github.com/mozilla/cbindgen/issues/901">#901</a>).</li>
<li>Update MSRV to 1.74 (<a
href="https://redirect.github.com/mozilla/cbindgen/issues/912">#912</a>,
<a
href="https://redirect.github.com/mozilla/cbindgen/issues/987">#987</a>).</li>
<li>Support #[deprecated] on enum variants (<a
href="https://redirect.github.com/mozilla/cbindgen/issues/933">#933</a>).</li>
<li>Support integrating the package_version information in a header file
comment (<a
href="https://redirect.github.com/mozilla/cbindgen/issues/939">#939</a>).</li>
<li>Add a language backend (<a
href="https://redirect.github.com/mozilla/cbindgen/issues/942">#942</a>).</li>
<li>Support generics with defaulted args (<a
href="https://redirect.github.com/mozilla/cbindgen/issues/959">#959</a>).</li>
<li>Add <code>VaList</code> compatibility (<a
href="https://redirect.github.com/mozilla/cbindgen/issues/970">#970</a>).</li>
</ul>
<h1>0.26.0</h1>
<ul>
<li>Fix swapping of <code>>>=</code> and <code><<=</code> in
constants.</li>
<li>Add support for #[deprecated] (<a
href="https://redirect.github.com/mozilla/cbindgen/issues/860">#860</a>).</li>
<li>Built-in support for bitflags 2.0.</li>
<li>Support for "C-unwind" ABI.</li>
<li>Generate bindings for non-public extern items if they are
#[no_mangle].</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/mozilla/cbindgen/blob/master/CHANGES">cbindgen's
changelog</a>.</em></p>
<blockquote>
<h1>0.29.0</h1>
<pre><code> * Support no-export annotation for statics and functions.
* Fixed conditional fields of constexpr literal structs
* Add rename rule for generated associated constant
* Upgrade heck to 0.5
* Add support for an optional nullable attribute
* docs.md: Fix deprecated_with_note and deprecated_variant_with_note
being spelled as 'notes'
* Fix generic with "void" default
* Fixed error generation of structures using the keyword as inside
arrays
* Added test for unsafe(no_mangle) attribute
* Fixed handling of trait methods containing the unsafe attribute
* Rename -Zparse-only
</code></pre>
<h1>0.28.0</h1>
<pre><code> * Parse unsafe attributes in
https://github.com/mozilla/cbindgen/pull/1020
* Fix local override of enum prefix-with-name by jsgf in
https://github.com/mozilla/cbindgen/pull/1006
* Add rename-all=prefix in https://github.com/mozilla/cbindgen/pull/1021
* ir: add support for UnsafeCell and SyncUnsafeCell by alekitto in
https://github.com/mozilla/cbindgen/pull/1003
* Implement mangling for arrays in
https://github.com/mozilla/cbindgen/pull/1022
* Fix: Ignore `CARGO_BUILD_TARGET` in tests by bryango in
https://github.com/mozilla/cbindgen/pull/1010
* Newline for each field for constexpr field constants by youknowone in
https://github.com/mozilla/cbindgen/pull/988
* Fix clippy warnings by youknowone in
https://github.com/mozilla/cbindgen/pull/1026
* Add aarch64/arm64 to CI by NickeZ in
https://github.com/mozilla/cbindgen/pull/1036
* Add `unstable_ir` feature flag that makes the ir pub by heesooy in
https://github.com/mozilla/cbindgen/pull/1011
* Support generated a symbols file by TheElectronWill in
https://github.com/mozilla/cbindgen/pull/916
</code></pre>
<h1>0.27.0</h1>
<pre><code> * Revert: The `Config` struct now has a private member.
* Allow users to specify a crate version for bindings generation
([#901](https://github.com/mozilla/cbindgen/issues/901)).
* Update MSRV to 1.74
([#912](https://github.com/mozilla/cbindgen/issues/912),
[#987](https://github.com/mozilla/cbindgen/issues/987)).
* Support #[deprecated] on enum variants
([#933](https://github.com/mozilla/cbindgen/issues/933)).
* Support integrating the package_version information in a header file
comment ([#939](https://github.com/mozilla/cbindgen/issues/939)).
* Add a language backend
([#942](https://github.com/mozilla/cbindgen/issues/942)).
* Support generics with defaulted args
([#959](https://github.com/mozilla/cbindgen/issues/959)).
* Add `VaList` compatibility
([#970](https://github.com/mozilla/cbindgen/issues/970)).
</code></pre>
<h1>0.26.0</h1>
<pre><code> * Fix swapping of `>>=` and `<<=` in constants.
* Add support for #[deprecated]
([#860](https://github.com/mozilla/cbindgen/issues/860)).
* Built-in support for bitflags 2.0.
* Support for "C-unwind" ABI.
* Generate bindings for non-public extern items if they are
#[no_mangle].
</code></pre>
<h2>0.25.0</h2>
<pre><code> * Re-release of yanked 0.24.6 as a major release
</code></pre>
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docs.md: Fix deprecated_with_note and deprecated_variant_with_note being
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Fix generic with "void" default</li>
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Updates the requirements on
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latest version.
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<h2>[0.6.0] - 2025-05-17</h2>
<h3>Changed</h3>
<ul>
<li>MSRV bumped to 1.80</li>
<li>The <code>real_blackbox</code> feature no longer has any impact.
Criterion always uses <code>std::hint::black_box()</code> now.
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<ul>
<li>Async benchmarking with Tokio may be done via a
<code>tokio::runtime::Handle</code>, not only a
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<h2>[0.5.1] - 2023-05-26</h2>
<h3>Fixed</h3>
<ul>
<li>Quick mode (--quick) no longer crashes with measured times over 5
seconds when --noplot is not active</li>
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<h2>[0.5.0] - 2023-05-23</h2>
<h3>Changed</h3>
<ul>
<li>Replaced lazy_static dependency with once_cell</li>
<li>Improved documentation of the <code>html_reports</code> feature</li>
<li>Replaced atty dependency with is-terminal</li>
<li>MSRV bumped to 1.64</li>
<li>Upgraded clap dependency to v4</li>
<li>Upgraded tempfile dependency to v3.5.0</li>
</ul>
<h3>Fixed</h3>
<ul>
<li>Quick mode (<code>--quick</code>) no longer outputs 1ms for measured
times over 5 seconds</li>
<li>Documentation updates</li>
</ul>
<h2>[0.4.0] - 2022-09-10</h2>
<h3>Removed</h3>
<ul>
<li>The <code>Criterion::can_plot</code> function has been removed.</li>
<li>The <code>Criterion::bench_function_over_inputs</code> function has
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<li>The <code>Criterion::bench_functions</code> function has been
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<li>The <code>Criterion::bench</code> function has been removed.</li>
</ul>
<h3>Changed</h3>
<ul>
<li>HTML report hidden behind non-default feature flag:
'html_reports'</li>
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'cargo_bench_support'</li>
<li>MSRV bumped to 1.57</li>
<li><code>rayon</code> and <code>plotters</code> are optional (and
default) dependencies.</li>
<li>Status messages ('warming up', 'analyzing', etc) are printed to
stderr, benchmark results are printed to stdout.</li>
<li>Accept subsecond durations for <code>--warm-up-time</code>,
<code>--measurement-time</code> and <code>--profile-time</code>.</li>
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Co-authored-by: zach <zach@dylibso.com>
Here is a code snippet that demonstrates the issue:
```rust
use extism_pdk::{encoding, plugin_fn, FnResult, FromBytes, Json, ToBytes};
use serde::{Serialize, Deserialize};
#[derive(Deserialize,FromBytes)]
pub struct Input {
value:String
}
#[derive(Serialize, ToBytes)]
pub struct Output {
value: f64,
}
#[plugin_fn]
pub fn convert(in_value: Input) -> FnResult<Output> {
Ok(Output { value: in_value.value.parse().expect("Conversion failed") })
}
```
Because the structs don't derive `encoding` the rust-analyzer gives this
suggestion:
```
encoding needs to be specified
= try: `#[encoding(ToJson)]`
```
I don't think this suggestion is correct because i could not find
`ToJson` anywhere. Adding `#[encoding(Json)]` solves the issue (as
described in the docs).
The final code would look as follows:
```rust
use extism_pdk::{encoding, plugin_fn, FnResult, FromBytes, Json, ToBytes};
use serde::{Serialize, Deserialize};
#[derive(Deserialize,FromBytes)]
#[encoding(Json)]
pub struct Input {
value:String
}
#[derive(Serialize, ToBytes)]
#[encoding(Json)]
pub struct Output {
value: f64,
}
#[plugin_fn]
pub fn convert(in_value: Input) -> FnResult<Output> {
Ok(Output { value: in_value.value.parse().expect("Conversion failed") })
}
```
And compiles perfectly.
I think the suggestion given by the rust-analyzer is incorrect so i am
proposing a fix for this.
Since I'm new to the project, any feedback is appreciated.
Thanks!
_Alessandro Ruggiero_
I know that there is already a logging example in
`runtime/examples/log_callback.rs` but I think that's not where people
go to look to figure out how the logging functionality works. At least
for me that wasn't the case :)
Previously, code that called a plugin that called a host function that
called back into the plugin would hang in an attempt to attain the lock.
Switch to `try_lock` so we can surface the error.
Upgrades from wasmtime 26 to wasmtime 27-29, allowing us to support more
versions (including the possibility of supporting future releases
without changes)
This PR adds a function to get the fuel consumed by a plugin. This is
useful for systems that want to fairly balance compute. It's my first
time doing anything in rust so let me know if something needs
improvements!
---------
Co-authored-by: zach <zach@dylibso.com>
Closes https://github.com/extism/extism/issues/801
Updates the error from:
```
Unable to compile Extism plugin: incompatible import type for `extism:host/user::wrong_type`
```
to:
```
Unable to compile Extism plugin: types incompatible: expected type `(func (result i32))`, found type `(func (result i64))`
```
I wrap the `Plugin` instance in a `RwLock` and because `function_exists`
requires `&mut self`, I have to acquire a write lock everytime to just
check if a function exists, which causes lock contention.
This changes it to `&self` since it doesn't need to mutate.
`extism_compiled_plugin_new` would panic on bad manifest input (there's
a test in the python sdk [1] that hits this directly.) Catch the error and
set `errmsg` appropriately instead.
Additionally: golf the function pointer casting for the various `plugin_new` calls,
with the goal of reducing the number of allocations by leaning on iterator size
hints (and reducing the scope of `unsafe{}` use.) This part can be severed: it
introduces a breaking change. Previously `NULL` values were silently accepted in
the `functions**` list; now they fail. This maintains consistency with behavior on
"consumed" `ExtismFunction` pointer.
[1]: https://github.com/extism/python-sdk/blob/main/tests/test_extism.py#L50-L53
