be.ems/lib/file/file.go

package file

import (
	"encoding/json"
	"fmt"
	"io"
	"net"
	"net/http"
	"os"
	"time"

	"ems.agt/lib/dborm"
	"ems.agt/lib/global"
	"ems.agt/lib/log"
	"ems.agt/lib/services"
	"ems.agt/restagent/config"
	"github.com/gorilla/mux"
)

const (
	//经过测试，linux下，延时需要大于100ms
	TIME_DELAY_AFTER_WRITE = 200
)

type Response struct {
	Data []string `json:"data"`
}

type MMLRequest struct {
	MML []string `json:"mml"`
}

func GetFile(w http.ResponseWriter, r *http.Request) {
	log.Debug("PostMMLToNF processing... ")

	vars := mux.Vars(r)
	neType := vars["elementTypeValue"]
	params := r.URL.Query()
	neId := params["ne_id"]
	log.Debug("neType:", neType, "neId", neId)

	neInfo := new(dborm.NeInfo)
	var err error
	if len(neId) == 0 {
		log.Error("ne_id NOT FOUND")
		services.ResponseBadRequest400WrongParamValue(w)
		return
	}
	neInfo, err = dborm.XormGetNeInfo(neType, neId[0])
	if err != nil {
		log.Error("dborm.XormGetNeInfo is failed:", err)
		services.ResponseInternalServerError500DatabaseOperationFailed(w)
		return
	}

	var buf [8192]byte
	var n int
	var mmlResult []string

	if neInfo != nil {
		hostMML := fmt.Sprintf("%s:%d", neInfo.Ip, config.GetYamlConfig().MML.Port)
		conn, err := net.Dial("tcp", hostMML)
		if err != nil {
			errMsg := fmt.Sprintf("Failed to dial %s: %v", hostMML, err)
			log.Error(errMsg)
			mmlResult = append(mmlResult, errMsg)
			response := Response{mmlResult}
			services.ResponseWithJson(w, http.StatusOK, response)
			return
		}

		loginStr := fmt.Sprintf("%s\n%s\n", config.GetYamlConfig().MML.User, config.GetYamlConfig().MML.Password)
		n, err = conn.Write([]byte(loginStr))
		if err != nil {
			log.Errorf("Error: %s", err.Error())
			return
		}

		time.Sleep(time.Millisecond * TIME_DELAY_AFTER_WRITE)

		n, err = conn.Read(buf[0:])
		if err != nil {
			log.Errorf("Error: %s", err.Error())
			return
		}
		log.Debug(string(buf[0:n]))

		body, err := io.ReadAll(io.LimitReader(r.Body, global.RequestBodyMaxLen))
		if err != nil {
			log.Error("io.ReadAll is failed:", err)
			services.ResponseNotFound404UriNotExist(w, r)
			return
		}
		log.Debug("Body:", string(body))

		mmlRequest := new(MMLRequest)
		_ = json.Unmarshal(body, mmlRequest)

		for _, mml := range mmlRequest.MML {
			mmlCommand := fmt.Sprintf("%s\n", mml)
			log.Debug("mml command:", mmlCommand)
			n, err = conn.Write([]byte(mmlCommand))
			if err != nil {
				log.Errorf("Error: %s", err.Error())
				return
			}
			time.Sleep(time.Millisecond * TIME_DELAY_AFTER_WRITE)

			n, err = conn.Read(buf[0:])
			if err != nil {
				log.Errorf("Error: %s", err.Error())
				return
			}
			log.Debug(string(buf[0 : n-len(neType)-2]))
			mmlResult = append(mmlResult, string(buf[0:n-len(neType)-2]))
		}
	}

	response := Response{mmlResult}
	services.ResponseWithJson(w, http.StatusOK, response)
}

// 格式文件大小单位
func FormatFileSize(fileSize float64) (size string) {
	if fileSize < 1024 {
		return fmt.Sprintf("%.2fB", fileSize/float64(1))
	} else if fileSize < (1024 * 1024) {
		return fmt.Sprintf("%.2fKB", fileSize/float64(1024))
	} else if fileSize < (1024 * 1024 * 1024) {
		return fmt.Sprintf("%.2fMB", fileSize/float64(1024*1024))
	} else if fileSize < (1024 * 1024 * 1024 * 1024) {
		return fmt.Sprintf("%.2fGB", fileSize/float64(1024*1024*1024))
	} else if fileSize < (1024 * 1024 * 1024 * 1024 * 1024) {
		return fmt.Sprintf("%.2fTB", fileSize/float64(1024*1024*1024*1024))
	} else {
		return fmt.Sprintf("%.2fEB", fileSize/float64(1024*1024*1024*1024*1024))
	}
}

func IsSymlink(mode os.FileMode) bool {
	return mode&os.ModeSymlink != 0
}

const dotCharacter = 46

func IsHidden(path string) bool {
	return path[0] == dotCharacter
}

func GetMimeType(path string) string {
	file, err := os.Open(path)
	if err != nil {
		return ""
	}
	defer file.Close()

	buffer := make([]byte, 512)
	_, err = file.Read(buffer)
	if err != nil {
		return ""
	}
	mimeType := http.DetectContentType(buffer)
	return mimeType
}

func GetSymlink(path string) string {
	linkPath, err := os.Readlink(path)
	if err != nil {
		return ""
	}
	return linkPath
}