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package main
import (
"context"
"sync"
"github.com/docker-archive/go-p9p"
)
// Session implements the p9p.Session interface.
type Session struct {
mu sync.Mutex
fids map[p9p.Fid]Fid
*Root
}
type Fid struct {
File
uname string
}
type File interface {
Qid() p9p.Qid
Stat() (p9p.Dir, error)
Open(mode p9p.Flag) error
Remove() error
Read(ctx context.Context, p []byte, offset int64) (n int, err error)
Write(ctx context.Context, p []byte, offset int64) (n int, err error)
}
type Dir interface {
File
Create(ctx context.Context, name string, perm uint32, mode p9p.Flag) (File, error)
Walk(ctx context.Context, name string) (File, error)
}
func NewSession(root *Root) p9p.Session {
return &Session{
fids: make(map[p9p.Fid]Fid),
Root: root,
}
}
func (s *Session) Auth(ctx context.Context, afid p9p.Fid, uname, aname string) (p9p.Qid, error) {
return p9p.Qid{}, p9p.MessageRerror{"authfs: no authentication required"}
}
func (s *Session) Attach(ctx context.Context, fid, afid p9p.Fid, uname, aname string) (p9p.Qid, error) {
s.mu.Lock()
defer s.mu.Unlock()
if _, exists := s.fids[fid]; exists {
return p9p.Qid{}, p9p.ErrDupfid
}
f := Fid{s.root, uname}
s.fids[fid] = f
return f.Qid(), nil
}
func (s *Session) Clunk(ctx context.Context, fid p9p.Fid) error {
s.mu.Lock()
defer s.mu.Unlock()
if _, ok := s.fids[fid]; ok {
delete(s.fids, fid)
return nil
} else {
return p9p.ErrUnknownfid
}
}
func (s *Session) Remove(ctx context.Context, fid p9p.Fid) error {
s.mu.Lock()
defer s.mu.Unlock()
f, ok := s.fids[fid]
if !ok {
return p9p.ErrUnknownfid
}
delete(s.fids, fid) // clunk
return f.Remove()
}
func (s *Session) Walk(ctx context.Context, fid, newfid p9p.Fid, names ...string) ([]p9p.Qid, error) {
s.mu.Lock()
defer s.mu.Unlock()
f, ok := s.fids[fid]
if !ok {
return nil, p9p.ErrUnknownfid
}
if _, exists := s.fids[newfid]; exists {
return nil, p9p.ErrDupfid
}
var (
qids []p9p.Qid
err error
dot = f
)
defer func() { s.fids[newfid] = dot }()
for _, name := range names {
dir, ok := dot.File.(Dir)
if !ok {
return qids, p9p.ErrWalknodir
}
dot.File, err = dir.Walk(ctx, name)
if err != nil {
return qids, err
}
qids = append(qids, dot.File.Qid())
}
return qids, nil
}
func (s *Session) Read(ctx context.Context, fid p9p.Fid, p []byte, offset int64) (n int, err error) {
s.mu.Lock()
defer s.mu.Unlock()
if f, ok := s.fids[fid]; ok {
return f.File.Read(ctx, p, offset)
} else {
return 0, p9p.ErrUnknownfid
}
}
func (s *Session) Write(ctx context.Context, fid p9p.Fid, p []byte, offset int64) (n int, err error) {
s.mu.Lock()
defer s.mu.Unlock()
if f, ok := s.fids[fid]; ok {
return f.File.Write(ctx, p, offset)
} else {
return 0, p9p.ErrUnknownfid
}
}
func (s *Session) Open(ctx context.Context, fid p9p.Fid, mode p9p.Flag) (p9p.Qid, uint32, error) {
s.mu.Lock()
defer s.mu.Unlock()
f, ok := s.fids[fid]
if !ok {
return p9p.Qid{}, 0, p9p.ErrUnknownfid
}
if err := f.Open(mode); err != nil {
return p9p.Qid{}, 0, err
}
return f.File.Qid(), 0, nil
}
func (s *Session) Create(ctx context.Context, parent p9p.Fid, name string, perm uint32, mode p9p.Flag) (p9p.Qid, uint32, error) {
s.mu.Lock()
defer s.mu.Unlock()
f, ok := s.fids[parent]
if !ok {
return p9p.Qid{}, 0, p9p.ErrUnknownfid
}
dir, ok := f.File.(Dir)
if !ok {
return p9p.Qid{}, 0, p9p.ErrCreatenondir
}
child, err := dir.Create(ctx, name, perm, mode)
return child.Qid(), 0, err
}
func (s *Session) Stat(ctx context.Context, fid p9p.Fid) (p9p.Dir, error) {
s.mu.Lock()
defer s.mu.Unlock()
if f, ok := s.fids[fid]; ok {
return f.File.Stat()
} else {
return p9p.Dir{}, p9p.ErrUnknownfid
}
}
func (s *Session) WStat(ctx context.Context, fid p9p.Fid, dir p9p.Dir) error {
return p9p.ErrPerm
}
func (s *Session) Version() (msize int, version string) {
return p9p.DefaultMSize, p9p.DefaultVersion
}
|