使用结构体变量保存配置信息

使用结构体变量保存配置信息

package main

import (
	"context"
	"fmt"
	"github.com/spf13/viper"
	"go.uber.org/zap"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"
	"web_app/dao/mysql"
	"web_app/dao/redis"
	"web_app/logger"
	"web_app/routes"
	"web_app/settings"
)

//go web开发的脚手架

func main() {
	//1. 配置加载
	if err := settings.Init(); err != nil {
		fmt.Println("init settings failed:", err)
		return

	}
	//2. 初始化日志
	if err := logger.Init(settings.Conf.LogConfig); err != nil {
		fmt.Println("init logger failed:", err)
		return

	}
	defer zap.L().Sync()
	zap.L().Debug("logger init success...")

	//3. 初始化mysql
	if err := mysql.Init(settings.Conf.MySQLConfig); err != nil {
		fmt.Println("init mysql failed:", err)
		return

	}
	defer mysql.Close()
	//4. 初始化redis
	if err := redis.Init(settings.Conf.RedisConfig); err != nil {
		fmt.Println("init redis failed:", err)
		return

	}
	defer redis.Close()
	//5. 注册路由
	r := routes.SetUp()
	srv := &http.Server{
		Addr:    fmt.Sprintf(":%d", viper.GetInt("app.port")),
		Handler: r,
	}

	go func() {
		// 开启一个goroutine启动服务
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("listen: %s\n", err)
		}
	}()

	// 等待中断信号来优雅地关闭服务器，为关闭服务器操作设置一个5秒的超时
	quit := make(chan os.Signal, 1) // 创建一个接收信号的通道
	// kill 默认会发送 syscall.SIGTERM 信号
	// kill -2 发送 syscall.SIGINT 信号，我们常用的Ctrl+C就是触发系统SIGINT信号
	// kill -9 发送 syscall.SIGKILL 信号，但是不能被捕获，所以不需要添加它
	// signal.Notify把收到的 syscall.SIGINT或syscall.SIGTERM 信号转发给quit
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM) // 此处不会阻塞
	<-quit                                               // 阻塞在此，当接收到上述两种信号时才会往下执行
	zap.L().Info("Shutdown Server ...")
	// 创建一个5秒超时的context
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	// 5秒内优雅关闭服务（将未处理完的请求处理完再关闭服务），超过5秒就超时退出
	if err := srv.Shutdown(ctx); err != nil {
		zap.L().Fatal("Server Shutdown: ", zap.Error(err))
	}

	zap.L().Info("Server exiting")
	//6. 启动服务(优雅关机)

}

logger

package logger

import (
	"net"
	"net/http"
	"net/http/httputil"
	"os"
	"runtime/debug"
	"strings"
	"time"
	"web_app/settings"

	"github.com/gin-gonic/gin"
	"github.com/natefinch/lumberjack"
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

// InitLogger 初始化Logger
func Init(cfg *settings.LogConfig) (err error) {
	writeSyncer := getLogWriter(cfg.Filename, cfg.MaxAge, cfg.MaxBackups, cfg.MaxSize)
	encoder := getEncoder()
	var l = new(zapcore.Level)
	err = l.UnmarshalText([]byte(cfg.Level))
	if err != nil {
		return
	}
	core := zapcore.NewCore(encoder, writeSyncer, l)

	lg := zap.New(core, zap.AddCaller())
	zap.ReplaceGlobals(lg) // 替换zap包中全局的logger实例，后续在其他包中只需使用zap.L()调用即可
	return
}

func getEncoder() zapcore.Encoder {
	encoderConfig := zap.NewProductionEncoderConfig()
	encoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
	encoderConfig.TimeKey = "time"
	encoderConfig.EncodeLevel = zapcore.CapitalLevelEncoder
	encoderConfig.EncodeDuration = zapcore.SecondsDurationEncoder
	encoderConfig.EncodeCaller = zapcore.ShortCallerEncoder
	return zapcore.NewJSONEncoder(encoderConfig)
}

func getLogWriter(filename string, maxSize, maxBackup, maxAge int) zapcore.WriteSyncer {
	lumberJackLogger := &lumberjack.Logger{
		Filename:   filename,
		MaxSize:    maxSize,
		MaxBackups: maxBackup,
		MaxAge:     maxAge,
	}
	return zapcore.AddSync(lumberJackLogger)
}

// GinLogger 接收gin框架默认的日志
func GinLogger() gin.HandlerFunc {
	return func(c *gin.Context) {
		start := time.Now()
		path := c.Request.URL.Path
		query := c.Request.URL.RawQuery
		c.Next()

		cost := time.Since(start)
		zap.L().Info(path,
			zap.Int("status", c.Writer.Status()),
			zap.String("method", c.Request.Method),
			zap.String("path", path),
			zap.String("query", query),
			zap.String("ip", c.ClientIP()),
			zap.String("user-agent", c.Request.UserAgent()),
			zap.String("errors", c.Errors.ByType(gin.ErrorTypePrivate).String()),
			zap.Duration("cost", cost),
		)
	}
}

// GinRecovery recover掉项目可能出现的panic，并使用zap记录相关日志
func GinRecovery(stack bool) gin.HandlerFunc {
	return func(c *gin.Context) {
		defer func() {
			if err := recover(); err != nil {
				// Check for a broken connection, as it is not really a
				// condition that warrants a panic stack trace.
				var brokenPipe bool
				if ne, ok := err.(*net.OpError); ok {
					if se, ok := ne.Err.(*os.SyscallError); ok {
						if strings.Contains(strings.ToLower(se.Error()), "broken pipe") || strings.Contains(strings.ToLower(se.Error()), "connection reset by peer") {
							brokenPipe = true
						}
					}
				}

				httpRequest, _ := httputil.DumpRequest(c.Request, false)
				if brokenPipe {
					zap.L().Error(c.Request.URL.Path,
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
					)
					// If the connection is dead, we can't write a status to it.
					c.Error(err.(error)) // nolint: errcheck
					c.Abort()
					return
				}

				if stack {
					zap.L().Error("[Recovery from panic]",
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
						zap.String("stack", string(debug.Stack())),
					)
				} else {
					zap.L().Error("[Recovery from panic]",
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
					)
				}
				c.AbortWithStatus(http.StatusInternalServerError)
			}
		}()
		c.Next()
	}
}

settings

package settings

import (
	"fmt"
	"github.com/fsnotify/fsnotify"
	"github.com/spf13/viper"
)

var Conf = new(AppConfig)

type AppConfig struct {
	Name         string `mapstructure:"name"`
	Mode         string `mapstructure:"mode"`
	Version      string `mapstructure:"version"`
	Port         int    `mapstructure:"port"`
	*LogConfig   `mapstructure:"log"`
	*MySQLConfig `mapstructure:"mysql"`
	*RedisConfig `mapstructure:"redis"`
}
type LogConfig struct {
	Level      string `mapstructure:"level"`
	Filename   string `mapstructure:"filename"`
	MaxSize    int    `mapstructure:"max_size"`
	MaxBackups int    `mapstructure:"max_backups"`
	MaxAge     int    `mapstructure:"max_age"`
}

type MySQLConfig struct {
	Host         string `mapstructure:"host"`
	Port         int    `mapstructure:"port"`
	User         string `mapstructure:"user"`
	Password     string `mapstructure:"password"`
	Dbname       string `mapstructure:"dbname"`
	MaxOpenConns int    `mapstructure:"max_open_conns"`
	MaxIdleConns int    `mapstructure:"max_idle_conns"`
}
type RedisConfig struct {
	Host     string `mapstructure:"host"`
	Port     int    `mapstructure:"port"`
	Db       int    `mapstructure:"db"`
	Password string `mapstructure:"password"`
	PoolSize int    `mapstructure:"pool_size"`
}

func Init() (err error) {
	viper.SetConfigName("config") //指定配置文件名称
	viper.SetConfigType("yaml")   // 指定配置文件类型
	viper.AddConfigPath(".")      // 指定查找配置文件的路径
	err = viper.ReadInConfig()    // 读取配置信息
	if err != nil {
		// 读取配置信息失败
		fmt.Println(" viper.ReadInConfig failed: ", err)

	}
	//把读取的配置文件信息反序列化到Conf变量中
	if err := viper.Unmarshal(Conf); err != nil {
		fmt.Printf("viper.Unmarshal(Conf) err %s", err)
	}
	// 监控配置文件变化
	viper.WatchConfig()
	viper.OnConfigChange(func(in fsnotify.Event) {
		fmt.Println("配置文件修改...")
		if err := viper.Unmarshal(Conf); err != nil {
			fmt.Printf("viper.Unmarshal(Conf) err %s", err)
		}
	})
	return

}

mysql

package mysql

import (
	"fmt"
	_ "github.com/go-sql-driver/mysql"
	"github.com/jmoiron/sqlx"
	"web_app/settings"
)

var db *sqlx.DB

func Init(cfg *settings.MySQLConfig) (err error) {
	dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True",
		cfg.User, cfg.Password, cfg.Host, cfg.Port, cfg.Dbname)
	// 也可以使用MustConnect连接不成功就panic
	db, err = sqlx.Connect("mysql", dsn)
	if err != nil {
		fmt.Printf("connect DB failed, err:%v\n", err)
		return
	}
	db.SetMaxOpenConns(cfg.MaxOpenConns)
	db.SetMaxIdleConns(cfg.MaxIdleConns)
	return
}
func Close() {
	_ = db.Close()
}

redis

package redis

import (
	"fmt"
	"github.com/go-redis/redis"
	"web_app/settings"
)

// 声明一个全局的rdb变量
var rdb *redis.Client

// 初始化连接
func Init(cfg *settings.RedisConfig) (err error) {
	rdb = redis.NewClient(&redis.Options{
		Addr:     fmt.Sprintf("%s:%d", cfg.Host, cfg.Port),
		Password: cfg.Password, // no password set
		DB:       cfg.Db,       // use default DB
		PoolSize: cfg.PoolSize,
	})

	_, err = rdb.Ping().Result()
	if err != nil {
		return err
	}
	return nil
}
func Close() {
	_ = rdb.Close()
}