Improve logging

internal/logging/logger.go

@@ -5,6 +5,8 @@ import (
 	"log"
 	"log/slog"
 	"os"
+	"path"
+	"time"
 
 	"git.a71.su/Andrew71/hibiscus-txt/internal/config"
 	"github.com/go-chi/chi/v5/middleware"
@@ -12,19 +14,30 @@ import (
 
 var DebugMode = false
 
+// File returns the appropriate filename for log
+// (log_dir/hibiscus_YYYY-MM-DD_HH:MM:SS.log)
+func File() string {
+	return config.Cfg.LogDir + "/hibiscus_" + time.Now().In(config.Cfg.Timezone).Format("2006-01-02_15:04:05") + ".log"
+}
+
 // LogInit makes slog output to both os.Stdout and a file if needed, and sets slog.LevelDebug if enabled.
 func LogInit() {
-	var w io.Writer
+	logFile := File()
+	var w io.Writer = os.Stdout
 	if config.Cfg.LogToFile {
-		f, err := os.OpenFile(config.Cfg.LogFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+		// Create dir in case it doesn't exist yet to avoid errors
+		err := os.MkdirAll(path.Dir(logFile), 0755)
 		if err != nil {
-			slog.Error("error opening log file, logging to stdout only", "path", config.Cfg.LogFile, "error", err)
-			return
+			slog.Error("error creating log dir, logging to stdout only", "path", path.Dir(logFile), "error", err)
+		} else {
+			f, err := os.OpenFile(logFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+			if err != nil {
+				slog.Error("error opening log file, logging to stdout only", "path", logFile, "error", err)
+				return
+			}
+			// No defer f.Close() because that breaks the MultiWriter
+			w = io.MultiWriter(f, os.Stdout)
 		}
-		// No defer f.Close() because that breaks the MultiWriter
-		w = io.MultiWriter(f, os.Stdout)
-	} else {
-		w = os.Stdout
 	}
 
 	// Make slog and chi use intended format
@@ -34,4 +47,5 @@ func LogInit() {
 	}
 	slog.SetDefault(slog.New(slog.NewTextHandler(w, opts)))
 	middleware.DefaultLogger = middleware.RequestLogger(&middleware.DefaultLogFormatter{Logger: log.Default(), NoColor: true})
+	slog.Debug("Debug mode enabled")  // This string is only shown if debugging
 }