fix nil pointer error

README.md

@@ -1,3 +1,77 @@
 # gologger
 
-a logger used in go
+GoLogger 是一个简单但功能强大的 Go 语言日志库，提供灵活的日志记录功能。它支持多种日志输出方式（控制台、文件等），并允许自定义日志格式。
+
+## 特性
+- 支持多种日志级别：ERROR, WARN, INFO, DEBUG, TRACE
+- 支持多种输出方式：控制台、文件（支持滚动策略）
+- 可定制日志格式
+- 支持按类别记录日志
+
+## 安装
+```bash
+go get github.com/yourusername/gologger
+```
+
+## 快速开始
+```go
+package main
+
+import (
+	"github.com/yourusername/gologger"
+)
+
+func main() {
+	// 获取默认logger
+	logger := gologger.GetLogger("main")
+
+	// 设置全局日志级别
+	gologger.Configure(gologger.LoggersConfig{
+		Level: "info",
+		Appenders: []gologger.LogAppenderConfig{
+			{
+				Type: "console",
+			},
+			{
+				Type: "file",
+				Options: map[string]interface{}{
+					"filePath": "app.log",
+					"EnableRolling": true,
+					"MaxSize": 1024 * 1024 * 10, // 10MB
+				},
+			},
+		},
+	})
+
+	// 记录日志
+	logger.Info("Application started")
+	logger.Error("An error occurred")
+}
+```
+
+## 配置说明
+
+### 日志级别
+支持的级别包括：off, error, warn, info, debug, trace
+
+### 输出方式（Appenders）
+
+1. **ConsoleAppender** - 控制台输出
+   配置示例：
+   ```go
+   {
+	Type: "console",
+   }
+   ```
+
+2. **FileAppender** - 文件输出，支持滚动策略
+   配置参数：
+   - filePath: 日志文件路径
+   - EnableRolling: 是否启用滚动（默认true）
+   - MaxSize: 单个文件最大大小（字节，默认10MB）
+   - MaxAge: 文件最大保存时间（秒，默认86400秒=24小时）
+
+### 格式化器
+可以通过SelectFormatter选择不同的日志格式：
+- simple: 简单格式 `[timestamp] level : category - message`
+- json: JSON 格式输出

console.go

@@ -4,6 +4,18 @@ import (
 	"fmt"
 )
 
+// ConsoleAppender implements the LoggerAppender interface for console output.
+// It uses color-coded templates for different log levels.
+// Example:
+//  appender := &ConsoleAppender{
+//    formatter: NewSimpleFormatter(),
+//  }
+//  appender.Append(event)
+//  appender.Close()
+type ConsoleAppender struct {
+	formatter LogFormatter
+}
+
 const (
 	ErrorTemplate = "\033[1;31m%s\033[0m"
 	WarnTemplate  = "\033[1;33m%s\033[0m"
@@ -12,10 +24,6 @@ const (
 	TraceTemplate = "\033[1;35m%s\033[0m"
 )
 
-type ConsoleAppender struct {
-	formatter LogFormatter
-}
-
 // Close implements LoggerAppender.
 func (c *ConsoleAppender) Close() {
 

file.go

@@ -8,6 +8,17 @@ import (
 	"time"
 )
 
+// FileAppender implements the LoggerAppender interface for file output.
+// It supports log rotation based on file size and age.
+// Example:
+//  appender := &FileAppender{
+//    formatter: NewSimpleFormatter(),
+//    filePath: "app.log",
+//    EnableRolling: true,
+//    MaxSize: 1024 * 1024 * 10, // 10MB
+//  }
+//  appender.Append(event)
+//  appender.Close()
 type FileAppender struct {
 	formatter LogFormatter
 	filePath  string

format.go

@@ -1,3 +1,5 @@
+// Package gologger provides a simple logging implementation with multiple appenders and formatters.
+// It supports console, file, and HTTP logging with customizable formats.
 package gologger
 
 import (
@@ -6,10 +8,19 @@ import (
 	"strings"
 )
 
-const logTemplate = "[%s] %s : %s - %s\n"
-
+// LogFormatter is a function type that formats a LogEvent into a string.
+// Example:
+//
+//	formatter := func(event LogEvent) string {
+//	  return fmt.Sprintf("[%s] %s: %v", event.Ts.Format("2006-01-02"), event.Level, event.Data)
+//	}
 type LogFormatter = func(LogEvent) string
 
+const logTemplate = "[%s] %s : %s - %s\n"
+
+// format is the default formatter that converts a LogEvent to a string using the default template.
+// It handles both simple values and formatted strings.
+// Template: "[timestamp] level : category - data"
 func format(logEvent LogEvent) string {
 	data := logEvent.Ts.Format("2006-01-02 15:04:05")
 	msg := ""

main.go

@@ -1,3 +1,5 @@
+// Package gologger provides a simple logging implementation with multiple appenders and formatters.
+// It supports console, file, and HTTP logging with customizable formats.
 package gologger
 
 import (
@@ -25,7 +27,21 @@ var logLevelMap map[string]int = map[string]int{
 var loggerMap map[string]*Logger = map[string]*Logger{}
 var appenderFactoryMap map[string]func(LogAppenderConfig) *LoggerAppender = map[string]func(LogAppenderConfig) *LoggerAppender{}
 var appenders map[string]*LoggerAppender = map[string]*LoggerAppender{}
-var loggerConfig LoggersConfig
+var loggerConfig LoggersConfig = LoggersConfig{
+	Appenders: map[string]LogAppenderConfig{
+		"console": {
+			Type:      "console",
+			Formatter: "text",
+			Options:   map[string]interface{}{},
+		},
+	},
+	Categories: map[string]LogConfig{
+		"default": {
+			Level:     "error",
+			Appenders: []string{"console"},
+		},
+	},
+}
 
 type LogAppenderConfig struct {
 	Type      string                 `json:"type"`
@@ -41,6 +57,14 @@ type LoggersConfig struct {
 	Appenders  map[string]LogAppenderConfig `json:"appenders"`
 	Categories map[string]LogConfig         `json:"categories"`
 }
+
+// Logger represents a logger instance for a specific category.
+// It maintains the log level and appenders for that category.
+// Example:
+//
+//	logger := GetLogger("mycategory")
+//	logger.Info("This is an info message")
+//	logger.Error("This is an error message")
 type Logger struct {
 	category  string
 	level     int
@@ -107,13 +131,11 @@ func GetLogger(name string) *Logger {
 		if ok {
 			return makeLogger(name, logConfig)
 		}
-		if name == "default" {
-			return defaultLogger
-		}
-		l := *GetLogger("default")
+		logConfig, ok = loggerConfig.Categories["default"]
+		l := makeLogger(name, logConfig)
 		l.category = name
-		loggerMap[name] = &l
-		return &l
+		loggerMap[name] = l
+		return l
 	}
 }
 
@@ -133,9 +155,15 @@ func makeLogger(name string, config LogConfig) *Logger {
 	loggerMap[name] = logger
 	return logger
 }
-func Configure(config LoggersConfig) {
+
+func ReconfigLoggers(config LoggersConfig) {
+	validateConfig(config)
 	loggerConfig = config
 	for name, appenderConfig := range loggerConfig.Appenders {
+		oldappender, ok := appenders[name]
+		if ok {
+			(*oldappender).Close()
+		}
 		appenderFactory, ok := appenderFactoryMap[appenderConfig.Type]
 		if ok {
 			appenders[name] = appenderFactory(appenderConfig)
@@ -143,12 +171,39 @@ func Configure(config LoggersConfig) {
 			appenders[name] = &consoleAppender
 		}
 	}
-	for name, _ := range loggerConfig.Categories {
-		GetLogger(name)
+	for name, logger := range loggerMap {
+		logConfig, ok := loggerConfig.Categories[name]
+		if !ok {
+			logConfig, _ = loggerConfig.Categories["default"]
+		}
+		logger.level = logLevelMap[strings.ToLower(logConfig.Level)]
+		if len(logConfig.Appenders) == 0 {
+			logger.appenders = []*LoggerAppender{&consoleAppender}
+		} else {
+			logger.appenders = make([]*LoggerAppender, len(logConfig.Appenders))
+			for i, appenderName := range logConfig.Appenders {
+				logger.appenders[i] = appenders[appenderName]
+			}
+		}
 	}
 }
+func validateConfig(config LoggersConfig) {
+	_, ok := loggerConfig.Categories["default"]
+	if !ok {
+		panic("default logger config not found")
+	}
+}
+func Configure(config LoggersConfig) {
+	validateConfig(config)
+	ReconfigLoggers(config)
+}
 
 func RegistAppender(typeName string, appenderCreatCb func(LogAppenderConfig) *LoggerAppender) {
 
 	appenderFactoryMap[typeName] = appenderCreatCb
 }
+
+func init() {
+	loggerMap["default"] = defaultLogger
+	appenders["console"] = &consoleAppender
+}

main_test.go

@@ -5,6 +5,12 @@ import "testing"
 
 func TestGetLogger(t *testing.T) {
 	// Initialize loggerMap and loggerConfig
+
+	dl := GetLogger("default")
+	if dl != defaultLogger {
+		t.Errorf("GetLogger(\"defult\") should return defaultLogger")
+	}
+	dl.Error("test")
 	Configure(LoggersConfig{
 		Appenders: map[string]LogAppenderConfig{
 			"console": {
@@ -24,12 +30,10 @@ func TestGetLogger(t *testing.T) {
 			},
 		},
 	})
-	dl := GetLogger("default")
-	// if dl != defaultLogger {
-	// 	t.Errorf("GetLogger(\"defult\") should return defaultLogger")
-	// }
-	dl.Error("test")
-
+	dl.Info("test")
+	if dl.level != Info {
+		t.Errorf("GetLogger(\"default\") should return defaultLogger")
+	}
 	al := GetLogger("app")
 
 	if al == dl {