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fix(config): read an empty document as the defaults - #166
serde-saphyr 2.1 refuses YAML null where a struct is expected, and a document without any node (empty, only comments, a bare ---) reads as null: every config reader refused a file with nothing set yet (unexpected end of input at line 1, column 1).
The shared reader tries the target type first and, only when the type refuses a document that holds no node, reads it from an empty mapping. A document with content reads as before; an explicit null/~ keeps its meaning (an optional reads it as absent, an untyped value as null).
serde-saphyr requirement 2.1.
Testing
cargo nextest run --all-features: 953 passed.
an_empty_document_is_the_default_config failed on serde-saphyr 2.1.0 before the change; an_explicit_null_document_keeps_its_meaning and an_empty_document_keeps_an_optional_absent failed with the first fallback.
- serde-saphyr 2.1 refuses YAML null where a struct is expected, and a
document without content (empty, only comments, a bare `---`) is null:
every config reader refused a file with nothing set yet
- the shared reader reads the document as an optional value and an
absent one as an empty mapping; a document with content reads as before
- serde-saphyr requirement 2.1; `an_empty_document_is_the_default_config`
failed on 2.1.0 before the change
Closes#165
parse_yaml now deserializes documents as Option<T> and parses {} when the document is null. Non-null documents use the existing deserialization path, moved to parse_yaml_document. The serde-saphyr minimum version changes to 2.1; its feature settings remain unchanged.
Empty configurations gain the intended default behavior, but explicit null values also change meaning. The compatibility risk is bounded; preserve explicit-null behavior or explicitly accept that change before merging.
Pre-merge checks: 4 · 1
Failed checks: 1 inconclusive
Check name
Status
Explanation
Resolution
Linked Issues check
The implementation matches #165: parse_yaml reads Option<T>, maps None to {}, and keeps content parsing and key-path error handling in parse_yaml_document. The dependency is set to `serde-sa…
Provide the post-change test results, including config::tests::an_empty_document_is_the_default_config, and the required CI status for main and the open Dependabot PR.
Passed checks: 4 passed
Check name
Status
Explanation
Title check
The title clearly and concisely identifies the main change: treating empty configuration documents as defaults.
Out of Scope Changes check
The changes stay within #165. The serde-saphyr 2.1 requirement and the shared YAML reader update directly implement the issue. The comment update documents the same behavior. No unrelated product be…
Docstring Coverage
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Description check
The description directly explains the serde-saphyr 2.1 update and the empty-document handling changes in src/config.rs. It also describes expected behavior for explicit null values and optional values…
Full details: Out of Scope Changes check
Explanation
The changes stay within #165. The serde-saphyr 2.1 requirement and the shared YAML reader update directly implement the issue. The comment update documents the same behavior. No unrelated product behavior or public API changes appear in the reviewed diff.
Full details: Docstring Coverage
Explanation
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 1 functions across 1 files. (1 skipped: 1 unsupported.)
Full details: Description check
Explanation
The description directly explains the serde-saphyr 2.1 update and the empty-document handling changes in src/config.rs. It also describes expected behavior for explicit null values and optional values.
Full details: Linked Issues check
Explanation
The implementation matches #165: parse_yaml reads Option<T>, maps None to {}, and keeps content parsing and key-path error handling in parse_yaml_document. The dependency is set to serde-saphyr 2.1. The reviewed evidence does not include post-change test results or CI status for main and the open Dependabot PR. Therefore, the automated-test and CI acceptance requirement cannot be confirmed.
Resolution
Provide the post-change test results, including config::tests::an_empty_document_is_the_default_config, and the required CI status for main and the open Dependabot PR.
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[Medium impact] The PR appears safe to merge; no actionable issues remain.
Summary
Makes empty YAML files load with the default settings while preserving explicit null values.
Empty YAML documents now load as defaults without changing explicit null.
Both earlier, unnumbered findings are addressed by the current code. Successful reads are preserved, and empty-looking input must pass the reader's checks before the fallback applies. No new actionable issues were found. Tests were inspected but not run.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/config.rs:
- Around line 347-349: Update parse_yaml’s fallback so it applies only when the
YAML document has no node, not whenever parsing as Option<T> yields None.
Preserve explicit null and ~ as YAML null through deserialization, including via
from_yaml, while retaining the existing fallback for node-less documents.
After applying the fix, consider running `coderabbit review --agent` for local
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- the reader tries the target type first and falls back to an empty
mapping only when the type refuses a document that holds no node, so an
optional reads `null` and an empty document as absent and an untyped
value reads `null` as null
- tests: an explicit null keeps its meaning, an empty document keeps an
optional absent (both failed with the earlier fallback)
- the empty-mapping reading also accepted text that only looked empty:
two documents (`---\n---\n`) or a broken directive (`%YAML\n---\n`)
became the default config instead of an error
- it now needs the reader to accept the input as one document holding
nothing, besides the text holding no explicit `null`
- test: a malformed empty-looking document is refused (failed before)
## 🤖 New release
* `structured-proxy`: 8.1.5 -> 8.1.6 (✓ API compatible changes)
<details><summary><i><b>Changelog</b></i></summary><p>
<blockquote>
##
[8.1.6](v8.1.5...v8.1.6)
- 2026-11-04
### Fixed
- *(config)* read an empty document as the defaults
([#166](#166))
</blockquote>
</p></details>
---
This PR was generated with
[release-plz](https://github.com/release-plz/release-plz/).
Co-authored-by: sw-release-bot[bot] <255865126+sw-release-bot[bot]@users.noreply.github.com>
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Summary
---) reads as null: every config reader refused a file with nothing set yet (unexpected end of input at line 1, column 1).null/~keeps its meaning (an optional reads it as absent, an untyped value as null).Testing
cargo nextest run --all-features: 953 passed.an_empty_document_is_the_default_configfailed on serde-saphyr 2.1.0 before the change;an_explicit_null_document_keeps_its_meaningandan_empty_document_keeps_an_optional_absentfailed with the first fallback.-D warningsand fmt clean.Closes #165