feat: 日志持久化存储到文件+管理员后台查看/清空日志页面

backend/internal/utils/logger.go

@@ -0,0 +1,94 @@
+package utils
+
+import (
+	"bufio"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+)
+
+var logFilePath = "data/app.log"
+
+func InitLogger() {
+	logDir := filepath.Dir(logFilePath)
+	if logDir != "." && logDir != "/" {
+		if err := os.MkdirAll(logDir, 0755); err != nil {
+			log.Fatalf("Failed to create log directory %s: %v", logDir, err)
+		}
+	}
+
+	file, err := os.OpenFile(logFilePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
+	if err != nil {
+		log.Fatalf("Failed to open log file %s: %v", logFilePath, err)
+	}
+
+	multiWriter := io.MultiWriter(os.Stdout, file)
+	log.SetOutput(multiWriter)
+
+	log.Printf("Logger initialized, log file: %s", logFilePath)
+}
+
+func GetLogs(lines int) ([]string, error) {
+	file, err := os.Open(logFilePath)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	ring := make([]string, 0, lines)
+	idx := 0
+
+	scanner := bufio.NewScanner(file)
+	buf := make([]byte, 0, 64*1024)
+	scanner.Buffer(buf, 1024*1024)
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if len(ring) < cap(ring) {
+			ring = append(ring, line)
+		} else {
+			ring[idx] = line
+		}
+		idx = (idx + 1) % cap(ring)
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	if len(ring) < cap(ring) {
+		return ring, nil
+	}
+
+	result := make([]string, len(ring))
+	for i := 0; i < len(ring); i++ {
+		result[i] = ring[(idx+i)%len(ring)]
+	}
+	return result, nil
+}
+
+func ClearLogs() error {
+	file, err := os.OpenFile(logFilePath, os.O_WRONLY|os.O_TRUNC, 0644)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	return nil
+}
+
+func GetLogSize() (int64, error) {
+	info, err := os.Stat(logFilePath)
+	if err != nil {
+		return 0, err
+	}
+	return info.Size(), nil
+}
+
+func GetLogModTime() (interface{}, error) {
+	info, err := os.Stat(logFilePath)
+	if err != nil {
+		return nil, err
+	}
+	return info.ModTime(), nil
+}