/
filesystem.go
161 lines (135 loc) · 3.16 KB
/
filesystem.go
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package octavius
import (
"errors"
"fmt"
log "github.com/sirupsen/logrus"
"io"
"net"
"net/http"
"os"
"path"
"path/filepath"
"sync"
)
type FileSystem struct {
root string
baseAddr string
addr string
countLock sync.Mutex
fileCount map[string]int
}
var dfs *FileSystem
func InitFileSystem(root string, addr string) {
dfs = &FileSystem{root: root, baseAddr: addr, fileCount: make(map[string]int)}
CreateFileDir(root)
go dfs.StartServer()
}
type Handler struct{ root string }
func (h Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
f, err := os.Open(filepath.Join(h.root, req.RequestURI))
if err != nil {
io.WriteString(w, "Error 500")
return
}
defer f.Close()
_, err = io.Copy(w, f)
if err != nil {
io.WriteString(w, "Error 500")
return
}
}
func (fs *FileSystem) GetHTTPAddr() string {
return fs.addr
}
func GetHTTPAddr() string {
return dfs.GetHTTPAddr()
}
func (fs *FileSystem) StartServer() {
listener, err := net.Listen("tcp", ":0")
if err != nil {
log.Fatalf("Unable to set up HTTP Listener: %v", err)
}
port := listener.Addr().(*net.TCPAddr).Port
log.Debugf("Starting HTTP File Server on Port %v", port)
fs.addr = fmt.Sprintf("%v:%v", fs.baseAddr, port)
err = http.Serve(listener, Handler{root: fs.root})
if err != nil {
log.Fatal(err)
}
}
func (fs *FileSystem) Open(filename string) (*os.File, error) {
return os.Open(path.Join(fs.root, filename))
}
func Open(filename string) (*os.File, error) {
return dfs.Open(filename)
}
func (fs *FileSystem) Create(filename string) (*os.File, error) {
f, err := os.Create(fs.abs(filename))
if err != nil {
return nil, err
}
if filename != "NULL" {
fs.countLock.Lock()
defer fs.countLock.Unlock()
fs.fileCount[fs.abs(filename)] = 1
}
return f, err
}
func Create(filename string) (*os.File, error) {
return dfs.Create(filename)
}
func (fs *FileSystem) abs(filename string) string {
return path.Join(fs.root, filename)
}
func (fs *FileSystem) CopyFile(srcFile, dstFile string) error {
return copyFile(path.Join(fs.root, srcFile), path.Join(fs.root, dstFile))
}
func CopyFile(srcFile, dstFile string) error {
return dfs.CopyFile(srcFile, dstFile)
}
func (fs *FileSystem) CreateCopy(filename string) {
if filename != "NULL" {
fs.countLock.Lock()
defer fs.countLock.Unlock()
if _, ok := fs.fileCount[fs.abs(filename)]; ok {
fs.fileCount[fs.abs(filename)] += 1
}
}
}
func CreateCopy(filename string) {
dfs.CreateCopy(filename)
}
func (fs *FileSystem) FileSize(filename string) int {
fi, err := os.Stat(path.Join(fs.root, filename))
if err != nil {
log.Fatal(err)
return -1
}
return int(fi.Size())
}
func FileSize(filename string) int {
return dfs.FileSize(filename)
}
func (fs *FileSystem) Delete(filename string) error {
fs.countLock.Lock()
defer fs.countLock.Unlock()
if filename == "NULL" {
return nil
}
abs := fs.abs(filename)
if _, ok := fs.fileCount[abs]; ok {
fs.fileCount[abs] -= 1
if fs.fileCount[abs] == 0 {
err := os.Remove(abs)
delete(fs.fileCount, abs)
return err
}
return nil
} else {
return errors.New("file does not exist")
}
return nil
}
func Delete(filename string) error {
return dfs.Delete(filename)
}