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/
temp.go
260 lines (214 loc) · 5.33 KB
/
temp.go
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package temp
import (
"errors"
"fmt"
"sync"
"golang.org/x/net/context"
"github.com/alternative-storage/torus"
"github.com/alternative-storage/torus/blockset"
"github.com/alternative-storage/torus/metadata"
"github.com/alternative-storage/torus/models"
"github.com/alternative-storage/torus/ring"
)
func init() {
torus.RegisterMetadataService("temp", NewTemp)
}
type Server struct {
mut sync.RWMutex
inode map[torus.VolumeID]torus.INodeID
vol torus.VolumeID
volIndex map[string]*models.Volume
global torus.GlobalMetadata
peers torus.PeerInfoList
ring torus.Ring
newRing torus.Ring
keys map[string]interface{}
ringListeners []chan torus.Ring
}
type Client struct {
cfg torus.Config
uuid string
srv *Server
leader bool
}
func NewServer() *Server {
r, err := ring.CreateRing(&models.Ring{
Type: uint32(ring.Empty),
Version: 1,
})
if err != nil {
panic(err)
}
return &Server{
volIndex: make(map[string]*models.Volume),
global: torus.GlobalMetadata{
BlockSize: 256,
DefaultBlockSpec: blockset.MustParseBlockLayerSpec("crc,base"),
},
ring: r,
keys: make(map[string]interface{}),
inode: make(map[torus.VolumeID]torus.INodeID),
}
}
func NewClient(cfg torus.Config, srv *Server) *Client {
return &Client{
cfg: cfg,
uuid: metadata.MakeUUID(),
srv: srv,
}
}
func NewTemp(cfg torus.Config) (torus.MetadataService, error) {
return NewClient(cfg, NewServer()), nil
}
func (t *Client) Kind() torus.MetadataKind {
return torus.TempMetadata
}
func (t *Client) GlobalMetadata() torus.GlobalMetadata {
return t.srv.global
}
func (t *Client) UUID() string {
return t.uuid
}
func (t *Client) GetLease() (int64, error) { return 1, nil }
func (t *Client) RenewLease(lease int64) error { return nil }
func (t *Client) GetLockStatus(vid uint64) string { return "" }
func (t *Client) GetPeers() (torus.PeerInfoList, error) {
t.srv.mut.RLock()
defer t.srv.mut.RUnlock()
peers := make(torus.PeerInfoList, len(t.srv.peers))
copy(peers, t.srv.peers)
return peers, nil
}
func (t *Client) RegisterPeer(_ int64, pi *models.PeerInfo) error {
t.srv.mut.Lock()
defer t.srv.mut.Unlock()
for i, p := range t.srv.peers {
if p.UUID == pi.UUID {
t.srv.peers[i] = pi
return nil
}
}
t.srv.peers = append(t.srv.peers, pi)
return nil
}
func (t *Client) NewVolumeID() (torus.VolumeID, error) {
t.srv.mut.Lock()
defer t.srv.mut.Unlock()
t.srv.vol++
return t.srv.vol, nil
}
func (t *Client) CommitINodeIndex(vol torus.VolumeID) (torus.INodeID, error) {
t.srv.mut.Lock()
defer t.srv.mut.Unlock()
t.srv.inode[vol]++
return t.srv.inode[vol], nil
}
func (t *Client) GetVolumes() ([]*models.Volume, torus.VolumeID, error) {
t.srv.mut.RLock()
defer t.srv.mut.RUnlock()
var out []*models.Volume
for _, v := range t.srv.volIndex {
out = append(out, v)
}
return out, t.srv.vol, nil
}
func (t *Client) CreateVolume(volume *models.Volume) error {
t.srv.volIndex[volume.Name] = volume
t.srv.inode[torus.VolumeID(volume.Id)] = 1
return nil
}
func (t *Client) GetVolume(volume string) (*models.Volume, error) {
t.srv.mut.RLock()
defer t.srv.mut.RUnlock()
if vol, ok := t.srv.volIndex[volume]; ok {
return vol, nil
}
return nil, errors.New(fmt.Sprintf("temp: volume %q not found", volume))
}
func (t *Client) GetRing() (torus.Ring, error) {
t.srv.mut.RLock()
defer t.srv.mut.RUnlock()
return t.srv.ring, nil
}
func (t *Client) SubscribeNewRings(ch chan torus.Ring) {
t.srv.SubscribeNewRings(ch)
}
func (t *Client) UnsubscribeNewRings(ch chan torus.Ring) {
t.srv.UnsubscribeNewRings(ch)
}
func (s *Server) SubscribeNewRings(ch chan torus.Ring) {
s.mut.Lock()
defer s.mut.Unlock()
s.ringListeners = append(s.ringListeners, ch)
}
func (s *Server) UnsubscribeNewRings(ch chan torus.Ring) {
s.mut.Lock()
defer s.mut.Unlock()
for i, c := range s.ringListeners {
if ch == c {
s.ringListeners = append(s.ringListeners[:i], s.ringListeners[i+1:]...)
return
}
}
panic("couldn't remove channel")
}
func (t *Client) Close() error {
t.srv.mut.Lock()
defer t.srv.mut.Unlock()
return nil
}
func (t *Client) SetRing(ring torus.Ring) error {
return t.srv.SetRing(ring)
}
func (s *Server) SetRing(ring torus.Ring) error {
s.mut.Lock()
defer s.mut.Unlock()
if ring.Version()-1 != s.ring.Version() {
return torus.ErrNonSequentialRing
}
s.ring = ring
for _, c := range s.ringListeners {
c <- s.ring
}
return nil
}
func (t *Client) GetINodeIndex(volume torus.VolumeID) (torus.INodeID, error) {
t.srv.mut.RLock()
defer t.srv.mut.RUnlock()
return t.srv.inode[volume], nil
}
func (t *Client) GetINodeIndexes() (map[torus.VolumeID]torus.INodeID, error) {
t.srv.mut.RLock()
defer t.srv.mut.RUnlock()
out := make(map[torus.VolumeID]torus.INodeID)
for k, v := range t.srv.inode {
out[k] = v
}
return out, nil
}
func (s *Server) Close() error {
return nil
}
func (t *Client) WithContext(_ context.Context) torus.MetadataService {
return t
}
func (t *Client) LockData() {
t.srv.mut.Lock()
}
func (t *Client) UnlockData() {
t.srv.mut.Unlock()
}
func (t *Client) GetData(x string) (interface{}, bool) {
out, exists := t.srv.keys[x]
return out, exists
}
func (t *Client) SetData(x string, v interface{}) {
t.srv.keys[x] = v
}
func (t *Client) DeleteVolume(name string) error {
t.srv.mut.Lock()
defer t.srv.mut.Unlock()
delete(t.srv.keys, name)
delete(t.srv.volIndex, name)
return nil
}