init; project structure & bybit provider

internal/logger/logger.go

@@ -0,0 +1,54 @@
+package logger
+
+import (
+	"crypto_alert_bot/internal/config"
+	"fmt"
+	"log/slog"
+	"os"
+
+	prettyLogger "github.com/charmbracelet/log"
+)
+
+var levelAdapter = map[string]slog.Level{
+	"debug": slog.LevelDebug,
+	"info":  slog.LevelInfo,
+	"warn":  slog.LevelWarn,
+	"error": slog.LevelError,
+}
+
+const (
+	encodingConsole = "console"
+	encodingJSON    = "json"
+)
+
+const (
+	serviceNameKey = "service_name"
+)
+
+func NewAppLogger(cfg *config.Logger) *slog.Logger {
+	var log *slog.Logger
+	// select log level
+	level, ok := levelAdapter[cfg.Level]
+	if !ok {
+		panic(fmt.Errorf("logger level not correct: %s", level))
+	}
+	// make handler
+	switch cfg.Encoding {
+	case encodingConsole:
+		handler := prettyLogger.NewWithOptions(os.Stdout, prettyLogger.Options{
+			Level:           prettyLogger.Level(level),
+			ReportTimestamp: true,
+			ReportCaller:    true,
+		})
+		log = slog.New(handler)
+	case encodingJSON:
+		handler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: level})
+		log = slog.New(handler)
+	default:
+		panic(fmt.Errorf("logger encoding is not correct: %s", cfg.Encoding))
+	}
+	// add field with service name
+	log = log.With(serviceNameKey, cfg.ServiceName)
+
+	return log
+}