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refactor(config): extract BindSourcesToStructs into pkg/config/binder - #3270

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extract-config-binder
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refactor(config): extract BindSourcesToStructs into pkg/config/binder#3270
dschmidt wants to merge 2 commits into
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extract-config-binder

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@dschmidt

@dschmidt dschmidt commented Aug 7, 2026

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Move BindSourcesToStructs into a new leaf package pkg/config/binder (depends only on gookit + pkg/config/defaults), so code that only needs to bind a yaml config file can import it without pulling in the aggregate service config in pkg/config.

pkg/config keeps a backward-compatible re-export, so existing callers are unchanged.

Why

This lets third-party services, like my opencloud-music, adopt the exact same config pattern as OpenCloud itself (config structs + yaml/env binding) without pulling in the whole OpenCloud dependency tree.

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codacy-production Bot commented Aug 7, 2026

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Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity · 0 duplication

Metric Results
Complexity 0
Duplication 0

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🟢 Coverage 66.67% diff coverage · 0.00% coverage variation

Metric Results
Coverage variation 0.00% coverage variation (-1.00%)
Diff coverage 66.67% diff coverage

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Coverage variation details
Coverable lines Covered lines Coverage
Common ancestor commit (ab0b3c5) 88027 20575 23.37%
Head commit (eba5e87) 88030 (+3) 20575 (+0) 23.37% (0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details
Coverable lines Covered lines Diff coverage
Pull request (#3270) 27 18 66.67%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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@dschmidt
dschmidt marked this pull request as ready for review August 7, 2026 23:33
dschmidt added a commit to dschmidt/libre-graph-adapter-kit that referenced this pull request Aug 7, 2026
dschmidt added a commit to dschmidt/immichframe-opencloud that referenced this pull request Aug 8, 2026
Load the yaml config file via opencloud/pkg/config.BindSourcesToStructs (env
vars still via opencloud/pkg/config/envdecode), so immichframe depends only on
regular released opencloud (pinned to the v7.4.0 commit) and not on the adapter
kit. This pulls in opencloud's service configs; opencloud-eu/opencloud#3270
extracts BindSourcesToStructs into a leaf package to drop those again.
@dschmidt
dschmidt requested review from aduffeck and fschade August 8, 2026 01:04
@dschmidt
dschmidt force-pushed the extract-config-binder branch from 1af19e3 to 2966708 Compare August 18, 2026 15:52
dragotin pushed a commit to dragotin/opencloud-immichframe that referenced this pull request Aug 25, 2026
Load the yaml config file via opencloud/pkg/config.BindSourcesToStructs (env
vars still via opencloud/pkg/config/envdecode), so immichframe depends only on
regular released opencloud (pinned to the v7.4.0 commit) and not on the adapter
kit. This pulls in opencloud's service configs; opencloud-eu/opencloud#3270
extracts BindSourcesToStructs into a leaf package to drop those again.
@dschmidt
dschmidt requested a lite review from Copilot September 1, 2026 07:37

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🟡 Changes recommended

It introduces an API-breaking re-export shape (function → assignable exported var) and contains a binder implementation issue (ignored YAML parse error + indirect binding target) plus a potentially flaky env-dependent test.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR refactors configuration binding by moving BindSourcesToStructs into a new leaf package (pkg/config/binder) so external/third-party services can reuse OpenCloud’s YAML/env binding without importing the aggregate pkg/config dependency tree.

Changes:

  • Introduces pkg/config/binder with BindSourcesToStructs and a test-friendly BindSourcesToStructsFS.
  • Keeps backward compatibility by exposing BindSourcesToStructs from pkg/config.
  • Moves/adjusts unit tests accordingly (including new package-level binder tests).
File summaries
File Description
pkg/config/helpers.go Re-exports BindSourcesToStructs from the new leaf binder package.
pkg/config/helpers_test.go Updates tests to call binder FS-binding helper directly.
pkg/config/binder/binder.go New leaf implementation for YAML/env binding into config structs.
pkg/config/binder/binder_test.go New unit tests for binder package behavior.
Review details
  • Files reviewed: 4/4 changed files
  • Comments generated: 4
  • Review effort level: Lite

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Comment thread pkg/config/binder/binder.go Outdated
Comment thread pkg/config/helpers.go Outdated
Comment thread pkg/config/binder/binder_test.go Outdated
Comment on lines +45 to +50
_ = cnf.LoadSources("yaml", yamlContent)

err = cnf.BindStruct("", &dst)
if err != nil {
return err
}

@dschmidt dschmidt Sep 1, 2026

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Deliberate: both are verbatim pre-extraction behavior and this is a pure move. Handling the error would make unparseable yaml fail the startup instead of binding nothing; marked the ignore as deliberate in code. The other three findings are addressed.

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🔵 Needs a closer look

pkg/config/binder.BindSourcesToStructsFS passes &dst to BindStruct, which provides a *interface{} rather than the caller’s destination and can yield incorrect or confusing binding behavior.

Review details

Suppressed comments (1)

pkg/config/binder/binder.go:49

  • dst is already the destination provided by callers (typically a pointer to a struct). Passing &dst here hands BindStruct a *interface{} instead, which is inconsistent with other usages in the repo (e.g. services/proxy/pkg/middleware/security.go:54) and can lead to confusing behavior if a caller accidentally passes a non-pointer value.
	err = cnf.BindStruct("", &dst)
  • Files reviewed: 4/4 changed files
  • Comments generated: 0 new
  • Review effort level: Lite

@dschmidt
dschmidt requested a review from micbar September 1, 2026 09:35
New leaf package (only gookit + pkg/config/defaults) so callers can bind a
yaml config file without importing the aggregate service config. pkg/config
keeps a backward-compatible re-export.
@dschmidt
dschmidt force-pushed the extract-config-binder branch from 4372c34 to eba5e87 Compare September 2, 2026 23:43
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