嵌入式linux之go语言开发（六）几行代码实现终端的远程日志诊断
日志是应用的镜子，可以发现应用中的问题，重要性不言而喻。
以往设备有问题了，是如何诊断的？我们是现场人员到现场，又是配合抓包，又是配合提供机器日志，效率极其低下。
如今都物联网时代了，能让数据跑路的还让人去跑路，不合适吧。
日志应能实现手工触发上送，或应用中出现严重问题时主动上送，或者远程控制其是否上送。
试想，如果能让问题出现在被客户发现之前，提前被开发人员获知，主动的解决问题，那么无疑提高了产品的竞争力和口碑。为杜绝问题造成的严重性而未及时发现提供先机。
当某天发现一机器偶然吐出一异常的bug日志时，且这日志暴露的问题若不解决将造成严重后果，而你恰好在你的邮箱里看到，这就在不知不觉中主动发现了问题。不用运维人员去找你，客户去找你，机器向你求救了。那么，救救它吧。
以下为在嵌入式linux上实现的一小功能，对终端产生的日志文件进行zip压缩并上送到后台FTP服务器中。
几行代码，轻松实现。又一次体现使用 go开发嵌入式linux应用的强大之处。
若要用c去做，那么呵呵，可以试试。
package main
import (
"archive/zip"
"flag"
"fmt"
"io"
"log"
"os"
"strings"
"github.com/dutchcoders/goftp"
"github.com/larspensjo/config"
)
var (
ftp *goftp.FTP
conFile = flag.String("ftpcfg", "/ftpcfg.ini", "config file")
Server string = "127.0.0.1:21"
User string = ""
Pwd string = ""
)
func checkErr(err error) {
if err != nil {
fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error())
}
}
/**
@files：需要压缩的文件
@compreFile：压缩之后的文件
*/
func CompressZip(files []*os.File, zipfileName string) (err error) {
zipfile, err := os.Create(zipfileName)
if err != nil {
return err
}
defer zipfile.Close()
zw := zip.NewWriter(zipfile)
defer zw.Close()
for _, file := range files {
err := compressZip(file, zw)
if err != nil {
return err
}
file.Close()
}
return nil
}
/**
功能：压缩文件
@file:压缩文件
@prefix：压缩文件内部的路径
@tw：写入压缩文件的流
*/
func compressZip(file *os.File, zw *zip.Writer) error {
info, err := file.Stat()
if err != nil {
log.Println("压缩文件失败：", err.Error())
return err
}
log.Println("filesize:", info.Size()/1024, "kb")
// 获取压缩头信息
head, err := zip.FileInfoHeader(info)
if err != nil {
log.Println("压缩文件失败：", err.Error())
return err
}
// 指定文件压缩方式 默认为 Store 方式 该方式不压缩文件 只是转换为zip保存
head.Method = zip.Deflate
fw, err := zw.CreateHeader(head)
if err != nil {
log.Println("压缩文件失败：", err.Error())
return err
}
// 写入文件到压缩包中
_, err = io.Copy(fw, file)
file.Close()
if err != nil {
log.Println("压缩文件失败：", err.Error())
return err
}
return nil
}
func main() {
log.Println("Hello Go")
defer func() {
if r := recover(); r != nil {
log.Printf("crash occurred!capture：%s\n", r)
}
}()
var fname string
flag.StringVar(&fname, "fname", "", "file name")
flag.Parse()
flag.Usage()
//获取当前路径
file, _ := os.Getwd()
cfg, err := config.ReadDefault(file + *conFile)
checkErr(err)
//获取配置文件中的配置项
Server, err = cfg.String("SERVERCONFIG", "Server")
User, err = cfg.String("USER", "User")
Pwd, err = cfg.String("USER", "Pwd")
//压缩ZIP
var filezips []*os.File
var filezip *os.File
if filezip, err = os.Open(fname); err != nil {
panic(err)
}
filezips = append(filezips, filezip)
log.Println("begin compressZip...")
err = CompressZip(filezips, fname+".zip")
if err != nil {
panic(err)
}
log.Println("compressZip ok!,name=" + fname + ".zip")
log.Println("User:" + User)
log.Println("->begin connect server:" + Server)
// For debug messages: goftp.ConnectDbg("ftp.server.com:21")
if ftp, err = goftp.ConnectDbg(Server); err != nil {
panic(err)
}
//ftp.debug = true
defer ftp.Close()
log.Println("->Successfully connected !!")
// Username / password authentication
if err = ftp.Login(User, Pwd); err != nil {
panic(err)
}
log.Println("->Login success!")
if err = ftp.Cwd("/"); err != nil {
panic(err)
}
var curpath string
if curpath, err = ftp.Pwd(); err != nil {
panic(err)
}
log.Printf("Current path: %s\n", curpath)
// Upload a file
var fileup *os.File
if fileup, err = os.Open(fname + ".zip"); err != nil {
panic(err)
}
log.Println("->begin upload file...")
info, err := fileup.Stat()
if err != nil {
panic(err)
}
log.Println("upload filesize:", info.Size()/1024, "kb")
fpath := fname + ".zip"
lastidx := strings.LastIndex(fname+".zip", "/")
if lastidx != -1 {
fpath = fname[lastidx:] + ".zip"
}
log.Printf("fpath:%s\n", fpath)
if err := ftp.Stor(fpath, fileup); err != nil {
panic(err)
}
log.Println("->upload file over!")
err = os.Remove(fname + ".zip") //上传成功，删除zip文件
if err != nil {
log.Println("file remove Error!")
panic(err)
}
}
编译与使用：
GOOS=linux GOARCH=arm GOARM=7 go build ftp.go
ftp -fname=/log/log_b503_20190730.log
root@b_lcd:/app/opt
./ftp -fname=/log/log_b503_20190730.log
Hello Go
Usage of ./ftp:
-fname string
file name
-ftpcfg string
config file (default "/ftpcfg.ini")
User:qq8864
->begin connect server:015.3vftp.com:21
2019/07/30 17:44:08 begin receiveLine...
2019/07/30 17:44:09 < 220 Serv-U FTP Server v6.4 for WinSock ready...
2019/07/30 17:44:09 receiveLine over!
2019/07/30 17:44:09 220 Serv-U FTP Server v6.4 for WinSock ready...
->Successfully connected !!
2019/07/30 17:44:09 > USER qq8864
2019/07/30 17:44:09 begin receiveLine...
2019/07/30 17:44:09 < 331 User name okay, need password.
2019/07/30 17:44:09 receiveLine over!
2019/07/30 17:44:09 > PASS sars1212
2019/07/30 17:44:09 begin receiveLine...
2019/07/30 17:44:09 < 230 User logged in, proceed.
2019/07/30 17:44:09 receiveLine over!
->Login success!
2019/07/30 17:44:09 > CWD /
2019/07/30 17:44:09 begin receiveLine...
2019/07/30 17:44:09 < 250 Directory changed to /
2019/07/30 17:44:09 receiveLine over!
2019/07/30 17:44:09 > PWD
2019/07/30 17:44:09 begin receiveLine...
2019/07/30 17:44:09 < 257 "/" is current directory.
2019/07/30 17:44:09 receiveLine over!
Current path: /
->begin upload file...
fpath:/log_b503_20190730.log
2019/07/30 17:44:09 > TYPE I
2019/07/30 17:44:09 begin receiveLine...
2019/07/30 17:44:11 < 200 Type set to I.
2019/07/30 17:44:11 receiveLine over!
2019/07/30 17:44:11 > PASV
2019/07/30 17:44:11 begin receiveLine...
2019/07/30 17:44:11 < 227 Entering Passive Mode (52,128,243,181,6,1)
2019/07/30 17:44:11 receiveLine over!
2019/07/30 17:44:11 > STOR /log_b503_20190730.log
2019/07/30 17:44:11 Connecting to 015.3vftp.com:1537
2019/07/30 17:44:11 begin receiveLine...
2019/07/30 17:44:11 < 150 Opening BINARY mode data connection for log_b503_20190730.log.
2019/07/30 17:44:11 receiveLine over!
2019/07/30 17:44:11 a1:150 Opening BINARY mode data connection for log_b503_20190730.log.
2019/07/30 17:44:11 begin receiveLine...
2019/07/30 17:44:13 < 226-Maximum disk quota limited to 102400 kBytes
2019/07/30 17:44:13 receiveLine over!
2019/07/30 17:44:13 begin receiveLine...
2019/07/30 17:44:13 < Used disk quota 64 kBytes, available 102335 kBytes
2019/07/30 17:44:13 receiveLine over!
2019/07/30 17:44:13 begin receiveLine...
2019/07/30 17:44:13 < 226 Transfer complete.
2019/07/30 17:44:13 receiveLine over!
2019/07/30 17:44:13 a2:226-Maximum disk quota limited to 102400 kBytes
Used disk quota 64 kBytes, available 102335 kBytes
226 Transfer complete.
->upload file over!