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dtc.go
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/
dtc.go
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package main
import (
"flag"
"io"
"labix.org/v2/mgo"
"log"
"os"
"regexp"
"runtime"
"strings"
"sync"
"time"
)
var (
session *mgo.Session
db *mgo.Database
gridFS *mgo.GridFS
url string
dbName string
gridFSName string
dirName string
w sync.WaitGroup
)
type StructFile struct {
Name string
File *os.File
}
func main() {
var (
channelFile chan StructFile
)
runtime.GOMAXPROCS(runtime.NumCPU())
channelFile = make(chan StructFile, 1000)
readFlag()
connect()
w.Add(1)
go scanDirByName(dirName, channelFile)
w.Wait()
close(channelFile)
// display(channelFile)
launchToServer(channelFile)
db.Logout()
}
func display(cIn chan StructFile) {
var (
sf StructFile
notClosed bool
)
notClosed = true
// for f, ok = <-cIn; ok; {
for notClosed {
sf, notClosed = <-cIn
log.Println(sf.Name)
}
}
func readFlag() {
flag.StringVar(&url, "url", "localhost", "url of mongo server")
flag.StringVar(&dbName, "db", "default", "name of the database")
flag.StringVar(&gridFSName, "gridName", "fs", "name of the gridFS collection")
flag.StringVar(&dirName, "dir", ".", "path to dir to send to the db")
flag.Parse()
if ok, _ := regexp.Match("/$", []byte(dirName)); !ok {
dirName = dirName + "/"
}
}
func connect() {
var err error
session, err = mgo.Dial(url)
check(err)
db = session.DB(dbName)
gridFS = db.GridFS(gridFSName)
}
func check(err error) {
if err != nil {
panic(err)
}
}
func isDir(dir *os.File) bool {
var (
err error
fi os.FileInfo
)
fi, err = dir.Stat()
check(err)
return fi.IsDir()
}
func open(name string) (*os.File, error) {
var (
f *os.File
err error
nbRedirect uint
)
for nbRedirect = 0; nbRedirect < 10; nbRedirect++ {
f, err = os.Open(name)
if err == nil {
return f, nil
}
name, err = os.Readlink(name)
check(err)
}
return nil, err
}
func scanDirByName(dirName string, cOut chan StructFile) {
var (
isD bool
sf StructFile
err error
)
sf.Name = dirName
sf.File, err = open(dirName)
check(err)
isD = isDir(sf.File)
if !isD {
panic("not a directory")
}
scanDir(sf, cOut)
}
func scanDir(sf StructFile, cOut chan StructFile) {
var (
fileNames []string
fileName string
err error
isD bool
newSf StructFile
)
fileNames, err = sf.File.Readdirnames(0)
check(err)
if ok, _ := regexp.Match("/$", []byte(sf.Name)); !ok {
sf.Name = sf.Name + "/"
}
for _, fileName = range fileNames {
fileName = sf.Name + fileName
newSf.Name = fileName
newSf.File, err = open(fileName)
check(err)
isD = isDir(newSf.File)
if isD {
w.Add(1)
go scanDir(newSf, cOut)
} else {
cOut <- newSf
}
}
w.Done()
}
func GetGridFile(name string) *mgo.GridFile {
var (
err error
result *mgo.GridFile
)
result, err = gridFS.Open(name)
if err == mgo.ErrNotFound {
return nil
}
check(err)
return result
}
func SetGridFile(sf StructFile) {
var (
dbFile *mgo.GridFile
err error
)
dbFile, err = gridFS.Create(sf.Name)
check(err)
io.Copy(dbFile, sf.File)
check(err)
err = dbFile.Close()
check(err)
}
func DeleteGridFile(sf StructFile) error {
return gridFS.Remove(sf.Name)
}
func UpdateGridFile(sf StructFile) {
var (
err error
)
err = DeleteGridFile(sf)
check(err)
SetGridFile(sf)
}
func GetFileData(name string) []byte {
var (
result []byte
file *mgo.GridFile
err error
)
file = GetGridFile(name)
result = make([]byte, file.Size())
_, err = file.Read(result)
check(err)
return result
}
func launchToServer(cIn chan StructFile) {
var (
err error
sf StructFile
dbF *mgo.GridFile
fi os.FileInfo
notClosed bool
dbTime time.Time
fsTime time.Time
)
for notClosed = true; notClosed; sf, notClosed = <-cIn {
sf.Name = strings.Replace(sf.Name, dirName, "", 1)
dbF = GetGridFile(sf.Name)
if dbF == nil {
log.Println("add : " + sf.Name)
SetGridFile(sf)
} else {
dbTime = dbF.UploadDate()
fi, err = sf.File.Stat()
check(err)
fsTime = fi.ModTime()
if fsTime.After(dbTime) {
log.Println("update : " + sf.Name)
UpdateGridFile(sf)
}
}
}
}