DB 시간포멧 수정. access log 추가

cmd/server/main.go

@@ -3,13 +3,18 @@ package main
 import (
 	"context"
 	"errors"
+	"fmt"
 	"log"
 	"net/url"
 	"os"
+	"path/filepath"
+	"strconv"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/middleware/logger"
 
 	"geoip-rest/internal/geo"
 	"geoip-rest/internal/schedule"
@@ -45,6 +50,8 @@ func main() {
 		ReadBufferSize:        16 * 1024, // allow larger request headers (e.g., proxy cookies)
 	})
 
+	app.Use(newFileLogger(env("ACCESS_LOG_PATH", "/log/api-access.log")))
+
 	app.Get("/", func(c *fiber.Ctx) error {
 		return c.JSON(fiber.Map{
 			"service": "geoip-rest",
@@ -107,6 +114,86 @@ func main() {
 	}
 }
 
+func newFileLogger(path string) fiber.Handler {
+	if path == "" {
+		return func(c *fiber.Ctx) error { return c.Next() }
+	}
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		log.Printf("access log disabled (mkdir failed: %v)", err)
+		return func(c *fiber.Ctx) error { return c.Next() }
+	}
+	maxBytes := int64(envInt("ACCESS_LOG_MAX_BYTES", 10*1024*1024))
+	writer, err := newRotatingWriter(path, maxBytes)
+	if err != nil {
+		log.Printf("access log disabled (open failed: %v)", err)
+		return func(c *fiber.Ctx) error { return c.Next() }
+	}
+
+	format := "${time} ${ip} ${method} ${path} ${protocol} ${status} ${latency_human} headers=${reqHeaders}\n"
+	cfg := logger.Config{
+		Format:     format,
+		TimeFormat: time.RFC3339,
+		TimeZone:   "Asia/Seoul",
+		Output:     writer,
+	}
+	return logger.New(cfg)
+}
+
+type rotatingWriter struct {
+	mu       sync.Mutex
+	path     string
+	maxBytes int64
+	file     *os.File
+}
+
+func newRotatingWriter(path string, maxBytes int64) (*rotatingWriter, error) {
+	f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o644)
+	if err != nil {
+		return nil, err
+	}
+	return &rotatingWriter{
+		path:     path,
+		maxBytes: maxBytes,
+		file:     f,
+	}, nil
+}
+
+func (w *rotatingWriter) Write(p []byte) (int, error) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	if err := w.rotateIfNeeded(len(p)); err != nil {
+		return 0, err
+	}
+	return w.file.Write(p)
+}
+
+func (w *rotatingWriter) rotateIfNeeded(incoming int) error {
+	info, err := w.file.Stat()
+	if err != nil {
+		return err
+	}
+	if info.Size()+int64(incoming) <= w.maxBytes {
+		return nil
+	}
+	_ = w.file.Close()
+
+	ts := time.Now().Format("20060102-150405")
+	rotated := fmt.Sprintf("%s.%s", w.path, ts)
+	if err := os.Rename(w.path, rotated); err != nil {
+		// attempt to reopen original to keep logging
+		w.file, _ = os.OpenFile(w.path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o644)
+		return err
+	}
+
+	f, err := os.OpenFile(w.path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o644)
+	if err != nil {
+		return err
+	}
+	w.file = f
+	return nil
+}
+
 func env(key, fallback string) string {
 	if val := os.Getenv(key); val != "" {
 		return val
@@ -129,6 +216,18 @@ func envBool(key string, fallback bool) bool {
 	}
 }
 
+func envInt(key string, fallback int) int {
+	val := os.Getenv(key)
+	if val == "" {
+		return fallback
+	}
+	parsed, err := strconv.Atoi(val)
+	if err != nil {
+		return fallback
+	}
+	return parsed
+}
+
 func sanitizeDBURL(raw string) string {
 	u, err := url.Parse(raw)
 	if err != nil {