hotime/context.go

package hotime

import (
	"bytes"
	"encoding/json"
	"errors"
	"io"
	"mime/multipart"
	"net/http"
	"strings"
	"sync"
	"time"

	. "code.hoteas.com/golang/hotime/common"
	. "code.hoteas.com/golang/hotime/db"
)

type Context struct {
	*Application
	Resp         http.ResponseWriter
	Req          *http.Request
	Log          Map //日志有则创建
	RouterString []string
	Config       Map
	Db           *HoTimeDB
	RespData     Map
	RespFunc     func()
	//CacheIns
	SessionIns
	DataSize   int
	HandlerStr string //复写请求url

	// 请求参数缓存
	reqJsonCache Map       // JSON Body 缓存
	reqMu        sync.Once // 确保 JSON 只解析一次
}

// Mtd 唯一标志
func (that *Context) Mtd(router [3]string) Map {
	that.Application.Router[router[0]][router[1]][router[2]](that)
	d := that.RespData
	that.RespData = nil
	return d
}

// 打印
func (that *Context) Display(statu int, data interface{}) {

	resp := Map{"status": statu}
	if statu != 0 {
		temp := Map{}

		tpe := that.Config.GetMap("error").GetString(ObjToStr(statu))
		if tpe == "" {
			//logFmt(errors.New("找不到对应的错误码"), 2, LOG_WARN)
		}

		temp["type"] = tpe
		temp["msg"] = data
		resp["result"] = temp
		//兼容android等需要json转对象的服务
		resp["error"] = temp

		that.Error.SetError(errors.New(resp.ToJsonString()))

	} else {
		resp["result"] = data
	}

	that.RespData = resp

	//that.Data=d;
}

func (that *Context) View() {
	if that.RespFunc != nil {
		that.RespFunc()
	}
	if that.RespData == nil {
		return
	}
	//创建日志
	if that.Log != nil {
		that.Log["time"] = time.Now().Format("2006-01-02 15:04")
		if that.Session("admin_id").Data != nil {
			that.Log["admin_id"] = that.Session("admin_id").ToCeilInt()
		}
		if that.Session("user_id").Data != nil {
			that.Log["user_id"] = that.Session("user_id").ToCeilInt()
		}
		//负载均衡优化
		ipStr := ""
		if that.Req.Header.Get("X-Forwarded-For") != "" {
			ipStr = that.Req.Header.Get("X-Forwarded-For")
		} else if that.Req.Header.Get("X-Real-IP") != "" {
			ipStr = that.Req.Header.Get("X-Real-IP")
		}
		//负载均衡优化
		if ipStr == "" {
			//RemoteAddr := that.Req.RemoteAddr
			ipStr = Substr(that.Req.RemoteAddr, 0, strings.Index(that.Req.RemoteAddr, ":"))
		}
		that.Log["ip"] = ipStr
		that.Db.Insert("logs", that.Log)
	}

	d, err := json.Marshal(that.RespData)
	if err != nil {
		that.Display(1, err.Error())
		that.View()
		return
	}
	that.DataSize = len(d)
	that.RespData = nil
	that.Resp.Write(d)
}

// ==================== 请求参数获取方法 ====================

// ReqParam 获取 URL 查询参数，返回 *Obj 支持链式调用
// 用法: that.ReqParam("id").ToInt()
func (that *Context) ReqParam(key string) *Obj {
	v := that.Req.URL.Query().Get(key)
	if v == "" {
		return &Obj{Data: nil}
	}
	return &Obj{Data: v}
}

// ReqForm 获取表单参数，返回 *Obj 支持链式调用
// 用法: that.ReqForm("name").ToStr()
func (that *Context) ReqForm(key string) *Obj {
	v := that.Req.FormValue(key)
	if v == "" {
		return &Obj{Data: nil}
	}
	return &Obj{Data: v}
}

// ReqJson 获取 JSON Body 中的字段，返回 *Obj 支持链式调用
// 用法: that.ReqJson("data").ToMap()
func (that *Context) ReqJson(key string) *Obj {
	that.parseJsonBody()
	if that.reqJsonCache == nil {
		return &Obj{Data: nil}
	}
	return &Obj{Data: that.reqJsonCache.Get(key)}
}

// parseJsonBody 解析 JSON Body（只解析一次，并发安全）
func (that *Context) parseJsonBody() {
	that.reqMu.Do(func() {
		if that.Req.Body == nil {
			return
		}
		body, err := io.ReadAll(that.Req.Body)
		if err != nil || len(body) == 0 {
			return
		}
		// 恢复 Body 以便后续代码可以再次读取
		that.Req.Body = io.NopCloser(bytes.NewBuffer(body))
		that.reqJsonCache = ObjToMap(string(body))
	})
}

// ReqData 统一获取请求参数，优先级: JSON > Form > URL
// 用法: that.ReqData("id").ToInt()
func (that *Context) ReqData(key string) *Obj {
	// 1. 优先从 JSON Body 获取
	that.parseJsonBody()
	if that.reqJsonCache != nil {
		if v := that.reqJsonCache.Get(key); v != nil {
			return &Obj{Data: v}
		}
	}
	// 2. 其次从 Form 获取
	if v := that.Req.FormValue(key); v != "" {
		return &Obj{Data: v}
	}
	// 3. 最后从 URL 参数获取
	if v := that.Req.URL.Query().Get(key); v != "" {
		return &Obj{Data: v}
	}
	return &Obj{Data: nil}
}

// ReqFile 获取单个上传文件
// 用法: file, header, err := that.ReqFile("avatar")
func (that *Context) ReqFile(name string) (multipart.File, *multipart.FileHeader, error) {
	return that.Req.FormFile(name)
}

// ReqFiles 获取多个同名上传文件（批量上传场景）
// 用法: files, err := that.ReqFiles("images")
func (that *Context) ReqFiles(name string) ([]*multipart.FileHeader, error) {
	if that.Req.MultipartForm == nil {
		if err := that.Req.ParseMultipartForm(32 << 20); err != nil {
			return nil, err
		}
	}
	if that.Req.MultipartForm == nil || that.Req.MultipartForm.File == nil {
		return nil, http.ErrMissingFile
	}
	files, ok := that.Req.MultipartForm.File[name]
	if !ok {
		return nil, http.ErrMissingFile
	}
	return files, nil
}