log: Hide timestamp if the program is not run in TTY

Signed-off-by: Tatiana Nesterenko <tatiana@nspcc.io>

cmd/neofs-rest-gw/config.go

@@ -25,6 +25,7 @@ import (
 	"github.com/spf13/viper"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
+	"golang.org/x/term"
 )
 
 const (
@@ -437,7 +438,12 @@ func newLogger(v *viper.Viper) *zap.Logger {
 	c := zap.NewProductionConfig()
 	c.Level = zap.NewAtomicLevelAt(lvl)
 	c.Encoding = "console"
-	c.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
+	// If the program is run in TTY, the logger adds a timestamp to its entries.
+	if term.IsTerminal(int(os.Stdout.Fd())) {
+		c.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
+	} else {
+		c.EncoderConfig.EncodeTime = func(t time.Time, encoder zapcore.PrimitiveArrayEncoder) {}
+	}
 
 	l, err := c.Build(
 		zap.AddStacktrace(zap.NewAtomicLevelAt(zap.FatalLevel)),

go.mod

@@ -109,7 +109,7 @@ require (
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/crypto v0.21.0 // indirect
 	golang.org/x/sys v0.18.0 // indirect
-	golang.org/x/term v0.18.0 // indirect
+	golang.org/x/term v0.18.0
 	golang.org/x/text v0.14.0 // indirect
 	google.golang.org/grpc v1.62.0 // indirect
 	google.golang.org/protobuf v1.33.0 // indirect