148 lines
3.6 KiB
Go
148 lines
3.6 KiB
Go
package main
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import (
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"context"
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"errors"
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"io"
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"log"
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"os"
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"path"
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"strings"
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"time"
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"github.com/minio/minio-go/v7"
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"golang.org/x/net/webdav"
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)
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/*
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* S3FS lifetime is limited to a single request
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* Conversely, Golang's abstraction has been thought to be shared between users
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* Sharing an instance between users would be very dangerous (as we would need many checks between shared values)
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*/
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type S3FS struct {
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cache map[string]*S3Stat
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mc *minio.Client
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ctx context.Context
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}
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func NewS3FS(mc *minio.Client) S3FS {
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return S3FS{
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cache: make(map[string]*S3Stat),
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mc: mc,
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}
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}
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func (s S3FS) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
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s.ctx = ctx
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p := NewS3Path(name)
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if p.class == ROOT {
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return errors.New("Unable to create another root folder")
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} else if p.class == BUCKET {
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log.Println("Creating bucket is not implemented yet")
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return nil
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}
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f, err := NewS3File(&s, path.Join(name, ".bagage"))
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if err != nil {
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return err
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}
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defer f.Close()
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_, err = io.Copy(f, strings.NewReader("This is a placeholder"))
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return nil
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}
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func (s S3FS) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
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s.ctx = ctx
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// If the file does not exist when opening it, we create a stub
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if _, ok := s.cache[name]; !ok {
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st := new(S3Stat)
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st.fs = &s
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st.path = NewS3Path(name)
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st.path.class = OBJECT
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st.obj.Key = st.path.key
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st.obj.LastModified = time.Now()
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s.cache[name] = st
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}
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return NewS3File(&s, name)
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}
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func (s S3FS) RemoveAll(ctx context.Context, name string) error {
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//@FIXME nautilus deletes files one by one, at the end, it does not find its folder as it is "already deleted"
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s.ctx = ctx
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p := NewS3Path(name)
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if p.class == ROOT {
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return errors.New("Unable to create another root folder")
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} else if p.class == BUCKET {
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log.Println("Deleting bucket is not implemented yet")
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return nil
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}
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objCh := s.mc.ListObjects(s.ctx, p.bucket, minio.ListObjectsOptions{Prefix: p.key, Recursive: true})
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rmCh := s.mc.RemoveObjects(s.ctx, p.bucket, objCh, minio.RemoveObjectsOptions{})
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for rErr := range rmCh {
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return rErr.Err
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}
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return nil
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}
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func (s S3FS) Rename(ctx context.Context, oldName, newName string) error {
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s.ctx = ctx
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po := NewS3Path(oldName)
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pn := NewS3Path(newName)
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if po.class == ROOT || pn.class == ROOT {
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return errors.New("Unable to rename root folder")
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} else if po.class == BUCKET || pn.class == BUCKET {
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log.Println("Moving a bucket is not implemented yet")
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return nil
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}
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//Check that newName is not inside oldName
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if len(newName) > len(oldName) && newName[:len(oldName)] == oldName {
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return errors.New("Cannot move an entity inside itself (eg. moving /data in /data/test is impossible)")
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}
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//Gather all keys, copy the object, delete the original
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objCh := s.mc.ListObjects(s.ctx, po.bucket, minio.ListObjectsOptions{Prefix: po.key, Recursive: true})
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for obj := range objCh {
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src := minio.CopySrcOptions{
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Bucket: po.bucket,
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Object: obj.Key,
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}
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dst := minio.CopyDestOptions{
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Bucket: pn.bucket,
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Object: path.Join(pn.key, obj.Key[len(po.key):]),
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}
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_, err := s.mc.CopyObject(s.ctx, dst, src)
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if err != nil {
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return err
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}
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err = s.mc.RemoveObject(s.ctx, po.bucket, obj.Key, minio.RemoveObjectOptions{})
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var e minio.ErrorResponse
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log.Println(errors.As(err, &e))
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log.Println(e)
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if errors.As(err, &e) && e.StatusCode == 200 {
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/* @FIXME workaround for garage's bug #98 */
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} else if err != nil {
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return err
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}
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}
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return nil
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}
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func (s S3FS) Stat(ctx context.Context, name string) (os.FileInfo, error) {
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s.ctx = ctx
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return NewS3Stat(&s, name)
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}
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