webapp

internal/config/logging.go

@@ -0,0 +1,34 @@
+package config
+
+import (
+	"io"
+	"os"
+
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+func NewLogger(version Version, output io.Writer, args []string) (*zap.Logger, func()) {
+	parsedCliArgs, _ := ParseArgs(version, os.Exit, args)
+	syncs := []zapcore.WriteSyncer{zapcore.AddSync(output)}
+	encoderConfig := zap.NewProductionEncoderConfig()
+	encoderConfig.EncodeTime = zapcore.RFC3339NanoTimeEncoder
+
+	core := zapcore.NewCore(
+		zapcore.NewJSONEncoder(encoderConfig),
+		zap.CombineWriteSyncers(syncs...),
+		zap.DebugLevel,
+	)
+	logger := zap.New(core).WithOptions(
+		zap.AddStacktrace(zap.ErrorLevel),
+		zap.WithCaller(false),
+	).With(
+		zap.String("version", version.Release),
+		zap.String("environment", *parsedCliArgs.Environment),
+	)
+	finalizer := func() {
+		//  This might fail if logging to console, but we don't care (https://github.com/uber-go/zap/issues/880)
+		_ = logger.Sync()
+	}
+	return logger, finalizer
+}