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filesystem.go
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filesystem.go
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package storage
import (
"io"
"os"
"path"
"path/filepath"
log "github.com/sirupsen/logrus"
)
type Filesystem struct {
prefix string
}
func NewFilesystemStorage(pth string) Storage {
return &Filesystem{
prefix: pth,
}
}
func (b *Filesystem) GetFile(pth string) (io.ReadCloser, error) {
return os.Open(path.Join(b.prefix, pth))
}
func (b *Filesystem) Exists(pth string) (bool, error) {
pth = path.Join(b.prefix, pth)
log.WithField("path", pth).Trace("fs: check exists")
_, err := os.Stat(pth)
if err != nil {
if os.IsNotExist(err) {
log.WithField("path", pth).WithField("exists", false).Trace("fs: check exists")
return false, nil
} else {
log.WithField("path", pth).WithError(err).Error("fs: check exists")
return false, err
}
}
log.WithField("path", pth).WithField("exists", true).Trace("fs: check exists")
return true, nil
}
func (b *Filesystem) Size(pth string) (int64, error) {
pth = path.Join(b.prefix, pth)
log.WithField("path", pth).Trace("fs: get size")
fi, err := os.Stat(pth)
if err != nil {
if os.IsNotExist(err) {
log.WithField("path", pth).WithError(err).Warn("fs: get size")
return 0, nil
} else {
log.WithField("path", pth).WithError(err).Error("fs: get size")
return 0, err
}
}
log.WithField("path", pth).WithField("size", fi.Size()).Trace("fs: got size")
return fi.Size(), nil
}
func (b *Filesystem) PutFile(pth string, in io.ReadCloser) error {
dir := path.Join(b.prefix, path.Dir(pth))
log.WithField("path", pth).Trace("fs: put file")
exists, err := b.Exists(dir)
if err != nil {
log.WithField("path", pth).WithError(err).Error("fs: put file (check exists)")
return err
}
if !exists {
if e := os.MkdirAll(dir, 0755); e != nil {
log.WithField("path", pth).WithError(err).Error("fs: put file (mkdir)")
return e
}
}
pth = path.Join(b.prefix, pth)
out, e := os.Create(pth)
if e != nil {
log.WithField("path", pth).WithError(err).Error("fs: put file (create)")
return e
}
defer in.Close()
defer out.Close()
_, e = io.Copy(out, in)
if e != nil {
log.WithField("path", pth).WithError(err).Error("fs: put file (copy)")
}
return e
}
func (b *Filesystem) ListFiles(pth string) (chan string, chan error) {
ch := make(chan string)
errs := make(chan error)
go func() {
log.WithField("path", pth).Trace("fs: list files")
exists, err := b.Exists(pth)
if err != nil {
errs <- err
return
}
if exists {
filepath.Walk(path.Join(b.prefix, pth),
func(p string, info os.FileInfo, err error) error {
if err != nil {
log.WithField("path", pth).WithError(err).Error("fs: list files (walk)")
errs <- err
return nil
}
if info != nil && !info.IsDir() {
log.WithField("found", p).Trace("fs: list files (walk)")
ch <- p
}
return nil
})
}
close(ch)
close(errs)
}()
return ch, errs
}
func (b *Filesystem) CanListFiles() bool {
return true
}
func (b *Filesystem) Close() error {
return nil
}