forked from ovh/svfs
/
root.go
186 lines (156 loc) · 4.52 KB
/
root.go
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package svfs
import (
"regexp"
"strings"
"golang.org/x/net/context"
"bazil.org/fuse"
"bazil.org/fuse/fs"
"github.com/xlucas/swift"
)
const (
segmentContainerSuffix = "_segments"
storagePolicyHeader = "X-Storage-Policy"
)
var (
segmentRegex = regexp.MustCompile("^.+" + segmentContainerSuffix + "$")
)
// Root is a fake root node used to hold a list of container nodes.
type Root struct {
*Directory
}
// Create is not supported on a root node since we can only create directories (i.e. containers).
func (r *Root) Create(ctx context.Context, req *fuse.CreateRequest, resp *fuse.CreateResponse) (fs.Node, fs.Handle, error) {
return nil, nil, fuse.ENOTSUP
}
// Mkdir creates a new container.
func (r *Root) Mkdir(ctx context.Context, req *fuse.MkdirRequest) (fs.Node, error) {
var (
segmentContainer = req.Name + segmentContainerSuffix
containers = make(map[string]*swift.Container)
)
for _, name := range []string{req.Name, segmentContainer} {
headers := make(map[string]string)
if StoragePolicy != "" {
headers[storagePolicyHeader] = StoragePolicy
}
err := SwiftConnection.ContainerCreate(name, headers)
if err != nil {
return nil, err
}
containers[name] = &swift.Container{Name: name}
}
container := &Directory{
c: containers[req.Name],
cs: containers[segmentContainer],
name: req.Name,
}
directoryCache.Set("", r.path, req.Name, container)
return container, nil
}
// Remove deletes a container.
func (r *Root) Remove(ctx context.Context, req *fuse.RemoveRequest) error {
if !req.Dir {
return fuse.ENOTSUP
}
for _, container := range []string{req.Name + segmentContainerSuffix, req.Name} {
if err := SwiftConnection.ContainerDelete(container); err != nil {
if err == swift.ContainerNotEmpty {
return fuse.ENOTEMPTY
}
if err != swift.ContainerNotFound {
return err
}
}
}
directoryCache.Delete("", r.path, req.Name)
return nil
}
// Rename is not supported on a root node.
func (r *Root) Rename(ctx context.Context, req *fuse.RenameRequest, newDir fs.Node) error {
return fuse.ENOTSUP
}
// ReadDirAll retrieves all containers within the current Openstack tenant, as direntries.
// Segment containers are not shown and created if missing.
func (r *Root) ReadDirAll(ctx context.Context) (direntries []fuse.Dirent, err error) {
var (
baseContainers = make(map[string]*swift.Container)
segmentContainers = make(map[string]*swift.Container)
children = make(map[string]Node)
)
// Cache hit
if _, nodes := directoryCache.GetAll("", r.path); nodes != nil {
for _, node := range nodes {
direntries = append(direntries, node.Export())
}
return direntries, nil
}
// Retrieve all containers
cs, err := SwiftConnection.ContainersAll(nil)
if err != nil {
return nil, err
}
// Sort base and segment containers
for _, segmentContainer := range cs {
s := segmentContainer
if StoragePolicy != "" {
_, headers, err := SwiftConnection.Container(s.Name)
if err != nil {
return nil, err
}
if headers[storagePolicyHeader] != StoragePolicy {
continue
}
}
if !segmentRegex.Match([]byte(s.Name)) {
baseContainers[s.Name] = &s
continue
}
if segmentRegex.Match([]byte(s.Name)) {
segmentContainers[strings.TrimSuffix(s.Name, segmentContainerSuffix)] = &s
continue
}
}
for _, baseContainer := range baseContainers {
c := baseContainer
// Create segment container if missing
if segmentContainers[c.Name] == nil {
segmentContainers[c.Name], err = createContainer(c.Name + segmentContainerSuffix)
if err != nil {
return nil, err
}
}
// Register direntries and cache entries
child := &Directory{
c: c,
cs: segmentContainers[c.Name],
name: c.Name,
}
children[c.Name] = child
direntries = append(direntries, child.Export())
}
directoryCache.AddAll("", r.path, r, children)
return direntries, nil
}
// Lookup gets a container node if its name matches the request
// name within the current context.
func (r *Root) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.LookupResponse) (fs.Node, error) {
// Fill cache if expired
if _, found := directoryCache.Peek("", r.path); !found {
r.ReadDirAll(ctx)
}
// Find matching child
if item := directoryCache.Get("", r.path, req.Name); item != nil {
if n, ok := item.(fs.Node); ok {
return n, nil
}
}
return nil, fuse.ENOENT
}
var (
_ Node = (*Root)(nil)
_ fs.Node = (*Root)(nil)
_ fs.NodeCreater = (*Root)(nil)
_ fs.NodeMkdirer = (*Root)(nil)
_ fs.NodeRemover = (*Root)(nil)
_ fs.NodeRenamer = (*Root)(nil)
)