feat(native-spans)!: change buffer foundation#2046
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## yannham/span-vec-fields-integration #2046 +/- ##
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+ Coverage 72.91% 73.00% +0.09%
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Files 460 465 +5
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Artifact Size Benchmark Reportaarch64-alpine-linux-musl
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The trace_buffer benchmark was still using HashMap for Span meta, metrics, and meta_struct fields after the VecMap migration. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The decoder functions were returning Vec<(K, V)> which callers immediately converted to VecMap via .into(). Return VecMap directly to avoid the unnecessary intermediate type. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Add the supporting types for the change-buffer module behind a `change-buffer` feature flag: ChangeBuffer (raw memory wrapper), OpCode/BufferedOperation, SpanHeader (repr(C)), SmallTraceMap, Trace, and error types. These are the building blocks for ChangeBufferState which follows in the next commit. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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| //! | ||
| //! The change buffer is currently designed and used for dd-trace-js, but the idea could be extended | ||
| //! to other runtime where the FFI cost is high. | ||
| #[allow(unused)] |
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With the change-buffer feature enabled, this outer attribute only applies to the following ChangeBufferError enum, so the rest of the new module still emits unused-import and dead-code warnings. I checked RUSTFLAGS='-D warnings' cargo check -p libdd-trace-utils --features change-buffer, and it fails on the unused imports/helpers and BufferedOperation; the required all-features clippy invocation also promotes these warnings to errors. Make this an inner module attribute (or remove the unused items) so the feature can pass CI.
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| /// A handle to a change buffer shared with another runtime. The memory is shared, meaning that | ||
| /// cloning is cheap (copying the pointer and length). | ||
| #[derive(Clone, Copy)] |
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Would it be better for this to be only Clone to prevent any accidental implicit copying?
Actually, does this need to even be clone?
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I would tend to think cloning/copying should be ok, since ChangeBuffer is effectively just a shared pointer (and a length). It's not needed on the libdatadog side (it compiles if I remove it), but not sure about the code on libdatadog-nodejs side though.
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Co-authored-by: Edmund Kump <edmund.kump@datadoghq.com>
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What does this PR do?
Add foundation types for dd-trace-js change buffer: buffer, opcodes and trace. Follow up of #2043.
Motivation
See #2022. Required for the integration of native spans into dd-trace-js.
Additional Notes
This PR just introduces the types and doesn't use them yet, hence the
allow(unused).How to test the change?
Unit tests provided.