Drop the external github.com/sirupsen/logrus dependency in favor of Go's
standard log/slog package (available since Go 1.21). The core/logger.Logger
interface is preserved unchanged — this is a pure implementation swap.
Key changes:
- slogLogger replaces logrusLogger, backed by slog.Logger + slog.LevelVar
- Custom levelTrace (-8) and levelFatal (+12) constants extend slog's
built-in 4 levels to cover the 6-level logrus-compatible range
- replaceAttr normalises output: lowercase level names and RFC 3339
timestamps with milliseconds (matches previous logrus JSON format)
- Shared *slog.LevelVar ensures WithFields clones inherit parent level
- Level guard (early return) in log/logf avoids wasted fmt.Sprint/Sprintf
when the message level is below the configured threshold
- Documented the stack depth assumption for the caller skip=3 frame
Test coverage (14 tests, all passing with -race):
- convertLevel/revertLevel round-trip for all 6 levels
- levelString for all levels including custom trace/fatal
- replaceAttr timestamp format, level name, groups passthrough
- caller format, level guard, WithFields, IsLevelEnabled, GetLevel
ginuerzh
219dd51548