|
| 1 | +package cmd |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "log/slog" |
| 6 | + |
| 7 | + "github.com/sirupsen/logrus" |
| 8 | +) |
| 9 | + |
| 10 | +// logrusSlogHandler is a slog.Handler that forwards to a logrus logger. |
| 11 | +// Attribute keys are namespaced with any active group path (e.g. "group.key"). |
| 12 | +type logrusSlogHandler struct { |
| 13 | + logger *logrus.Logger //nolint:forbidigo |
| 14 | + attrs []slog.Attr // pre-qualified attrs (keys already include group prefix) |
| 15 | + groupPath string // dot-joined group names from outer to inner, e.g. "a.b" |
| 16 | +} |
| 17 | + |
| 18 | +func newLogrusSlogHandler(logger *logrus.Logger) slog.Handler { //nolint:forbidigo |
| 19 | + return &logrusSlogHandler{logger: logger} |
| 20 | +} |
| 21 | + |
| 22 | +func (h *logrusSlogHandler) Enabled(_ context.Context, level slog.Level) bool { |
| 23 | + switch { |
| 24 | + case level >= slog.LevelError: |
| 25 | + return h.logger.IsLevelEnabled(logrus.ErrorLevel) |
| 26 | + case level >= slog.LevelWarn: |
| 27 | + return h.logger.IsLevelEnabled(logrus.WarnLevel) |
| 28 | + case level >= slog.LevelInfo: |
| 29 | + return h.logger.IsLevelEnabled(logrus.InfoLevel) |
| 30 | + default: |
| 31 | + return h.logger.IsLevelEnabled(logrus.DebugLevel) |
| 32 | + } |
| 33 | +} |
| 34 | + |
| 35 | +func (h *logrusSlogHandler) Handle(_ context.Context, r slog.Record) error { |
| 36 | + fields := make(logrus.Fields, len(h.attrs)+r.NumAttrs()) |
| 37 | + for _, a := range h.attrs { |
| 38 | + fields[a.Key] = a.Value.Any() |
| 39 | + } |
| 40 | + r.Attrs(func(a slog.Attr) bool { |
| 41 | + flattenAttr(h.groupPath, a, fields) |
| 42 | + return true |
| 43 | + }) |
| 44 | + |
| 45 | + entry := h.logger.WithFields(fields) |
| 46 | + switch { |
| 47 | + case r.Level >= slog.LevelError: |
| 48 | + entry.Error(r.Message) |
| 49 | + case r.Level >= slog.LevelWarn: |
| 50 | + entry.Warn(r.Message) |
| 51 | + case r.Level >= slog.LevelInfo: |
| 52 | + entry.Info(r.Message) |
| 53 | + default: |
| 54 | + entry.Debug(r.Message) |
| 55 | + } |
| 56 | + return nil |
| 57 | +} |
| 58 | + |
| 59 | +func (h *logrusSlogHandler) WithAttrs(attrs []slog.Attr) slog.Handler { |
| 60 | + // Flatten and pre-qualify keys now so Handle doesn't repeat the work. |
| 61 | + fields := make(logrus.Fields, len(attrs)) |
| 62 | + for _, a := range attrs { |
| 63 | + flattenAttr(h.groupPath, a, fields) |
| 64 | + } |
| 65 | + qualified := make([]slog.Attr, 0, len(fields)) |
| 66 | + for k, v := range fields { |
| 67 | + qualified = append(qualified, slog.Any(k, v)) |
| 68 | + } |
| 69 | + combined := make([]slog.Attr, len(h.attrs)+len(qualified)) |
| 70 | + copy(combined, h.attrs) |
| 71 | + copy(combined[len(h.attrs):], qualified) |
| 72 | + return &logrusSlogHandler{logger: h.logger, attrs: combined, groupPath: h.groupPath} |
| 73 | +} |
| 74 | + |
| 75 | +func (h *logrusSlogHandler) WithGroup(name string) slog.Handler { |
| 76 | + if name == "" { |
| 77 | + return h |
| 78 | + } |
| 79 | + path := name |
| 80 | + if h.groupPath != "" { |
| 81 | + path = h.groupPath + "." + name |
| 82 | + } |
| 83 | + return &logrusSlogHandler{logger: h.logger, attrs: h.attrs, groupPath: path} |
| 84 | +} |
| 85 | + |
| 86 | +// flattenAttr writes a into fields with keys qualified by prefix. |
| 87 | +// If a is a group-kind attr, it recurses into its children. |
| 88 | +func flattenAttr(prefix string, a slog.Attr, fields logrus.Fields) { |
| 89 | + key := a.Key |
| 90 | + if prefix != "" { |
| 91 | + key = prefix + "." + key |
| 92 | + } |
| 93 | + if a.Value.Kind() == slog.KindGroup { |
| 94 | + for _, child := range a.Value.Group() { |
| 95 | + flattenAttr(key, child, fields) |
| 96 | + } |
| 97 | + return |
| 98 | + } |
| 99 | + if fields != nil { |
| 100 | + fields[key] = a.Value.Any() |
| 101 | + } |
| 102 | +} |
0 commit comments