chore(logger): add otel handler (#26)

Author: raf555

go.mod

@@ -96,6 +96,7 @@ require (
 	github.com/puzpuzpuz/xsync/v3 v3.5.1 // indirect
 	github.com/quic-go/qpack v0.6.0 // indirect
 	github.com/quic-go/quic-go v0.59.0 // indirect
+	github.com/remychantenay/slog-otel v1.3.4 // indirect
 	github.com/rs/zerolog v1.26.1 // indirect
 	github.com/russross/blackfriday/v2 v2.0.1 // indirect
 	github.com/samber/slog-common v0.19.0 // indirect

go.sum

@@ -215,6 +215,8 @@ github.com/quic-go/quic-go v0.59.0 h1:OLJkp1Mlm/aS7dpKgTc6cnpynnD2Xg7C1pwL6vy/SA
 github.com/quic-go/quic-go v0.59.0/go.mod h1:upnsH4Ju1YkqpLXC305eW3yDZ4NfnNbmQRCMWS58IKU=
 github.com/raf555/salome v0.0.0-20260217024826-a3f86dff4827 h1:Nu5jXZHarRG64nQqNZJajm9/3DNEYrh0ap1AYzUVgt8=
 github.com/raf555/salome v0.0.0-20260217024826-a3f86dff4827/go.mod h1:1gLJUtlTPmadZFDnTp4LYJibpvUAjULSS5kTWOJ7ANA=
+github.com/remychantenay/slog-otel v1.3.4 h1:xoM41ayLff2U8zlK5PH31XwD7Lk3W9wKfl4+RcmKom4=
+github.com/remychantenay/slog-otel v1.3.4/go.mod h1:ZkazuFMICKGDrO0r1njxKRdjTt/YcXKn6v2+0q/b0+U=
 github.com/rogpeppe/go-internal v1.14.1 h1:UQB4HGPB6osV0SQTLymcB4TgvyWu6ZyliaW0tI/otEQ=
 github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7so1lCWt35ZSgc=
 github.com/rs/xid v1.3.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=

internal/logger/loggerfx/logger.go

@@ -18,7 +18,4 @@ var Provider = fx.Module(
 			return logger.WithContext(ctx, log)
 		}
 	}),
-	fx.Invoke(func(l *slog.Logger) {
-		slog.SetDefault(l)
-	}),
 )

internal/logger/slog.go

@@ -4,16 +4,18 @@ import (
 	"log/slog"
 	"os"
 
+	"github.com/raf555/salome/melt/log"
 	slogformatter "github.com/samber/slog-formatter"
 )
 
 func New() *slog.Logger {
-	timeDurationFormatter := slogformatter.FormatByKind(slog.KindDuration, func(v slog.Value) slog.Value {
+	var handler slog.Handler
+
+	handler = slog.NewJSONHandler(os.Stdout, nil)
+	handler = log.WithOtelHandler(handler)
+	handler = log.WithFormatter(handler, slogformatter.FormatByKind(slog.KindDuration, func(v slog.Value) slog.Value {
 		return slog.StringValue(v.Duration().String())
-	})
-	return slog.New(
-		slogformatter.NewFormatterHandler(timeDurationFormatter)(
-			slog.NewJSONHandler(os.Stdout, nil),
-		),
-	)
+	}))
+
+	return log.New(handler)
 }