Rene Nochebuena
3667b92fab
Structured logger backed by log/slog with request-context enrichment, extra-field context helpers, and duck-typed automatic error enrichment. What's included: - `Logger` interface with Debug / Info / Warn / Error / With / WithContext; `New(Options)` constructor writing to os.Stdout - `WithRequestID` / `GetRequestID` and `WithField` / `WithFields` context helpers — package owns both context keys - Automatic error_code and context-field enrichment in Logger.Error via duck-typed errorWithCode / errorWithContext interfaces (no xerrors import) Tested-via: todo-api POC integration Reviewed-against: docs/adr/
31 lines
3.0 KiB
Markdown
31 lines
3.0 KiB
Markdown
# Changelog
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All notable changes to this module will be documented in this file.
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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
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and this module adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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## [0.9.0] - 2026-03-18
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### Added
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- `Logger` interface — `Debug(msg string, args ...any)`, `Info(msg string, args ...any)`, `Warn(msg string, args ...any)`, `Error(msg string, err error, args ...any)`, `With(args ...any) Logger`, `WithContext(ctx context.Context) Logger`
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- `Options` struct — `Level slog.Level` (minimum log level; default `slog.LevelInfo`), `JSON bool` (JSON vs text output; default text), `StaticArgs []any` (key-value pairs attached to every record); zero value is valid
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- `New(opts Options) Logger` — constructs a `Logger` backed by `log/slog`, writing to `os.Stdout`; returns the `Logger` interface, never the concrete type
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- `WithRequestID(ctx context.Context, id string) context.Context` — stores a request correlation ID in the context under a private unexported key owned by this package
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- `GetRequestID(ctx context.Context) string` — retrieves the correlation ID; returns `""` if absent or if ctx is nil
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- `WithField(ctx context.Context, key string, value any) context.Context` — adds a single key-value logging field to the context
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- `WithFields(ctx context.Context, fields map[string]any) context.Context` — merges multiple key-value fields into the context without overwriting existing fields
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- `Logger.WithContext(ctx context.Context) Logger` — returns a child logger pre-enriched with `request_id` and any extra fields stored in the context via `WithRequestID` / `WithField` / `WithFields`; returns the same logger unchanged if ctx is nil or carries no relevant values
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- `Logger.With(args ...any) Logger` — returns a child logger with the given key-value attributes permanently attached to every subsequent record
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- Automatic `error_code` field enrichment in `Logger.Error` when `err` satisfies the private `errorWithCode` duck-type interface (`ErrorCode() string`)
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- Automatic context-field enrichment in `Logger.Error` when `err` satisfies the private `errorWithContext` duck-type interface (`ErrorContext() map[string]any`)
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### Design Notes
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- `New` returns the `Logger` interface (not `*slogLogger`), and `With` likewise returns `Logger`; the concrete type is never exported, making the interface the only public surface and enabling safe local re-declaration in downstream libraries without importing this package.
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- This package owns the context keys `ctxRequestIDKey{}` and `ctxExtraFieldsKey{}` as unexported struct types, preventing collisions; any module that needs to attach a request ID to logs imports only `logz`.
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- The xerrors integration is zero-import: `Logger.Error` uses `errors.As` against two private interfaces (`errorWithCode`, `errorWithContext`) that `xerrors.Err` satisfies — no import between the two packages is required in either direction.
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[0.9.0]: https://code.nochebuena.dev/go/logz/releases/tag/v0.9.0
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