forked from AdguardTeam/golibs
/
levelhandler.go
56 lines (46 loc) · 1.65 KB
/
levelhandler.go
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package slogutil
import (
"context"
"log/slog"
)
// A LevelHandler wraps a Handler with an Enabled method that returns false for
// levels below a minimum.
//
// See https://cs.opensource.google/go/x/exp/+/master:slog/example_level_handler_test.go.
type LevelHandler struct {
level slog.Leveler
handler slog.Handler
}
// NewLevelHandler returns a LevelHandler with the given level. All methods
// except Enabled delegate to h.
func NewLevelHandler(level slog.Leveler, h slog.Handler) (lh *LevelHandler) {
// As an optimization, avoid chains of LevelHandlers.
lh, ok := h.(*LevelHandler)
if ok {
h = lh.Handler()
}
return &LevelHandler{level, h}
}
// type check
var _ slog.Handler = (*LevelHandler)(nil)
// Enabled implements the [slog.Handler] interface for *LevelHandler. It
// reports whether level is as high as h's level.
func (h *LevelHandler) Enabled(_ context.Context, level slog.Level) (ok bool) {
return level >= h.level.Level()
}
// Handle implements the [slog.Handler] interface for *LevelHandler.
func (h *LevelHandler) Handle(ctx context.Context, r slog.Record) (err error) {
return h.handler.Handle(ctx, r)
}
// WithAttrs implements the [slog.Handler] interface for *LevelHandler.
func (h *LevelHandler) WithAttrs(attrs []slog.Attr) (res slog.Handler) {
return NewLevelHandler(h.level, h.handler.WithAttrs(attrs))
}
// WithGroup implements the [slog.Handler] interface for *LevelHandler.
func (h *LevelHandler) WithGroup(name string) (res slog.Handler) {
return NewLevelHandler(h.level, h.handler.WithGroup(name))
}
// Handler returns the slog.Handler wrapped by h.
func (h *LevelHandler) Handler() (unwrapped slog.Handler) {
return h.handler
}