chore: logger: seperate error log output (#249)

server/cmd/main.go

@@ -6,14 +6,14 @@ import (
 	"github.com/bufbuild/protovalidate-go"
 	"github.com/joho/godotenv"
 	"go.uber.org/fx"
-	"go.uber.org/zap"
 
 	"github.com/crlssn/getstronger/server/bus"
 	"github.com/crlssn/getstronger/server/pkg/config"
 	"github.com/crlssn/getstronger/server/pkg/cookies"
 	"github.com/crlssn/getstronger/server/pkg/db"
 	"github.com/crlssn/getstronger/server/pkg/email"
 	"github.com/crlssn/getstronger/server/pkg/jwt"
+	"github.com/crlssn/getstronger/server/pkg/logger"
 	"github.com/crlssn/getstronger/server/pkg/repo"
 	"github.com/crlssn/getstronger/server/pkg/stream"
 	"github.com/crlssn/getstronger/server/pkg/trace"
@@ -33,9 +33,9 @@ func options() []fx.Option {
 		db.Module(),
 		bus.Module(),
 		jwt.Module(),
+		logger.Module(),
 		server.Module(),
 		fx.Provide(
-			zap.NewDevelopment,
 			repo.New,
 			email.New,
 			trace.New,

server/pkg/logger/module.go

@@ -0,0 +1,30 @@
+package logger
+
+import (
+	"go.uber.org/fx"
+	"go.uber.org/zap"
+)
+
+func Module() fx.Option {
+	return fx.Module("logger", fx.Options(
+		fx.Provide(
+			func() zap.Config {
+				return zap.Config{
+					Level:       zap.NewAtomicLevelAt(zap.InfoLevel),
+					Development: false,
+					Sampling: &zap.SamplingConfig{
+						Initial:    100, //nolint:mnd
+						Thereafter: 100, //nolint:mnd
+					},
+					Encoding:         "json",
+					EncoderConfig:    zap.NewProductionEncoderConfig(),
+					OutputPaths:      []string{"stdout"},
+					ErrorOutputPaths: []string{"stderr"},
+				}
+			},
+			func(config zap.Config) (*zap.Logger, error) {
+				return config.Build()
+			},
+		),
+	))
+}