ADD: added dockerfiles and a logger for the backend

backend/internal/logger/logger.go

@@ -0,0 +1,46 @@
+// internal/logger/logger.go
+package logger
+
+import (
+	"io"
+	"os"
+	"time"
+
+	"github.com/rs/zerolog"
+)
+
+var Log zerolog.Logger
+
+// Init initializes the global logger.
+// It configures console output, timestamps, and log level from environment.
+func Init() {
+	// Determine output writer
+	consoleWriter := zerolog.ConsoleWriter{
+		Out:        os.Stdout,
+		TimeFormat: time.RFC3339,
+	}
+
+	// You can switch to JSON output by replacing with os.Stdout directly:
+	// writer := os.Stdout
+
+	// Create the global logger
+	Log = zerolog.New(consoleWriter).
+		Level(zerolog.TraceLevel).With().Caller().Logger().
+		With().
+		Timestamp().
+		Logger()
+
+	// Set log level from environment variable, default to InfoLevel
+	level := zerolog.InfoLevel
+	if lvlStr, ok := os.LookupEnv("LOG_LEVEL"); ok {
+		if parsedLevel, err := zerolog.ParseLevel(lvlStr); err == nil {
+			level = parsedLevel
+		}
+	}
+	zerolog.SetGlobalLevel(level)
+}
+
+// SetOutput allows changing output (e.g., to a file)
+func SetOutput(w io.Writer) {
+	Log = Log.Output(w)
+}