seaweedfs/go/storage/store.go

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package storage
import (
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"code.google.com/p/weed-fs/go/util"
"encoding/json"
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"fmt"
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"io/ioutil"
"code.google.com/p/weed-fs/go/glog"
"net/url"
"strconv"
"strings"
)
type DiskLocation struct {
directory string
maxVolumeCount int
volumes map[VolumeId]*Volume
}
type Store struct {
Port int
Ip string
PublicUrl string
locations []*DiskLocation
masterNode string
dataCenter string //optional informaton, overwriting master setting if exists
rack string //optional information, overwriting master setting if exists
connected bool
volumeSizeLimit uint64 //read from the master
}
func NewStore(port int, ip, publicUrl string, dirnames []string, maxVolumeCounts []int) (s *Store) {
s = &Store{Port: port, Ip: ip, PublicUrl: publicUrl}
s.locations = make([]*DiskLocation, 0)
for i := 0; i < len(dirnames); i++ {
location := &DiskLocation{directory: dirnames[i], maxVolumeCount: maxVolumeCounts[i]}
location.volumes = make(map[VolumeId]*Volume)
location.loadExistingVolumes()
s.locations = append(s.locations, location)
}
return
}
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func (s *Store) AddVolume(volumeListString string, replicationType string) error {
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rt, e := NewReplicationTypeFromString(replicationType)
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if e != nil {
return e
}
for _, range_string := range strings.Split(volumeListString, ",") {
if strings.Index(range_string, "-") < 0 {
id_string := range_string
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id, err := NewVolumeId(id_string)
if err != nil {
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return fmt.Errorf("Volume Id %s is not a valid unsigned integer!", id_string)
}
e = s.addVolume(VolumeId(id), rt)
} else {
pair := strings.Split(range_string, "-")
start, start_err := strconv.ParseUint(pair[0], 10, 64)
if start_err != nil {
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return fmt.Errorf("Volume Start Id %s is not a valid unsigned integer!", pair[0])
}
end, end_err := strconv.ParseUint(pair[1], 10, 64)
if end_err != nil {
return fmt.Errorf("Volume End Id %s is not a valid unsigned integer!", pair[1])
}
for id := start; id <= end; id++ {
if err := s.addVolume(VolumeId(id), rt); err != nil {
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e = err
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}
}
}
}
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return e
}
func (s *Store) findVolume(vid VolumeId) *Volume {
for _, location := range s.locations {
if v, found := location.volumes[vid]; found {
return v
}
}
return nil
}
func (s *Store) findFreeLocation() (ret *DiskLocation) {
max := 0
for _, location := range s.locations {
currentFreeCount := location.maxVolumeCount - len(location.volumes)
if currentFreeCount > max {
max = currentFreeCount
ret = location
}
}
return ret
}
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func (s *Store) addVolume(vid VolumeId, replicationType ReplicationType) error {
if s.findVolume(vid) != nil {
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return fmt.Errorf("Volume Id %s already exists!", vid)
}
if location := s.findFreeLocation(); location != nil {
glog.V(0).Infoln("In dir", location.directory, "adds volume =", vid, ", replicationType =", replicationType)
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if volume, err := NewVolume(location.directory, vid, replicationType); err == nil {
location.volumes[vid] = volume
return nil
} else {
return err
}
}
return fmt.Errorf("No more free space left")
}
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func (s *Store) CheckCompactVolume(volumeIdString string, garbageThresholdString string) (error, bool) {
vid, err := NewVolumeId(volumeIdString)
if err != nil {
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return fmt.Errorf("Volume Id %s is not a valid unsigned integer!", volumeIdString), false
}
garbageThreshold, e := strconv.ParseFloat(garbageThresholdString, 32)
if e != nil {
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return fmt.Errorf("garbageThreshold %s is not a valid float number!", garbageThresholdString), false
}
if v := s.findVolume(vid); v != nil {
return nil, garbageThreshold < v.garbageLevel()
}
return fmt.Errorf("volume id %s is not found during check compact!", vid), false
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}
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func (s *Store) CompactVolume(volumeIdString string) error {
vid, err := NewVolumeId(volumeIdString)
if err != nil {
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return fmt.Errorf("Volume Id %s is not a valid unsigned integer!", volumeIdString)
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}
if v := s.findVolume(vid); v != nil {
return v.compact()
}
return fmt.Errorf("volume id %s is not found during compact!", vid)
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}
func (s *Store) CommitCompactVolume(volumeIdString string) error {
vid, err := NewVolumeId(volumeIdString)
if err != nil {
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return fmt.Errorf("Volume Id %s is not a valid unsigned integer!", volumeIdString)
}
if v := s.findVolume(vid); v != nil {
return v.commitCompact()
}
return fmt.Errorf("volume id %s is not found during commit compact!", vid)
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}
func (s *Store) FreezeVolume(volumeIdString string) error {
vid, err := NewVolumeId(volumeIdString)
if err != nil {
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return fmt.Errorf("Volume Id %s is not a valid unsigned integer!", volumeIdString)
}
if v := s.findVolume(vid); v != nil {
if v.readOnly {
return fmt.Errorf("Volume %s is already read-only", volumeIdString)
}
return v.freeze()
}
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return fmt.Errorf("volume id %s is not found during freeze!", vid)
}
func (l *DiskLocation) loadExistingVolumes() {
if dirs, err := ioutil.ReadDir(l.directory); err == nil {
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for _, dir := range dirs {
name := dir.Name()
if !dir.IsDir() && strings.HasSuffix(name, ".dat") {
base := name[:len(name)-len(".dat")]
if vid, err := NewVolumeId(base); err == nil {
if l.volumes[vid] == nil {
if v, e := NewVolume(l.directory, vid, CopyNil); e == nil {
l.volumes[vid] = v
glog.V(0).Infoln("In dir", l.directory, "read volume =", vid, "replicationType =", v.ReplicaType, "version =", v.Version(), "size =", v.Size())
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}
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}
}
}
}
}
glog.V(0).Infoln("Store started on dir:", l.directory, "with", len(l.volumes), "volumes", "max", l.maxVolumeCount)
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}
func (s *Store) Status() []*VolumeInfo {
var stats []*VolumeInfo
for _, location := range s.locations {
for k, v := range location.volumes {
s := &VolumeInfo{Id: VolumeId(k), Size: v.ContentSize(),
RepType: v.ReplicaType, Version: v.Version(),
FileCount: v.nm.FileCount(),
DeleteCount: v.nm.DeletedCount(),
DeletedByteCount: v.nm.DeletedSize(),
ReadOnly: v.readOnly}
stats = append(stats, s)
}
}
return stats
}
type JoinResult struct {
VolumeSizeLimit uint64
}
func (s *Store) SetMaster(mserver string) {
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s.masterNode = mserver
}
func (s *Store) SetDataCenter(dataCenter string) {
s.dataCenter = dataCenter
}
func (s *Store) SetRack(rack string) {
s.rack = rack
}
func (s *Store) Join() error {
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stats := new([]*VolumeInfo)
maxVolumeCount := 0
for _, location := range s.locations {
maxVolumeCount = maxVolumeCount + location.maxVolumeCount
for k, v := range location.volumes {
s := &VolumeInfo{Id: VolumeId(k), Size: uint64(v.Size()),
RepType: v.ReplicaType, Version: v.Version(),
FileCount: v.nm.FileCount(),
DeleteCount: v.nm.DeletedCount(),
DeletedByteCount: v.nm.DeletedSize(),
ReadOnly: v.readOnly}
*stats = append(*stats, s)
}
}
bytes, _ := json.Marshal(stats)
values := make(url.Values)
if !s.connected {
values.Add("init", "true")
}
values.Add("port", strconv.Itoa(s.Port))
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values.Add("ip", s.Ip)
values.Add("publicUrl", s.PublicUrl)
values.Add("volumes", string(bytes))
values.Add("maxVolumeCount", strconv.Itoa(maxVolumeCount))
values.Add("dataCenter", s.dataCenter)
values.Add("rack", s.rack)
jsonBlob, err := util.Post("http://"+s.masterNode+"/dir/join", values)
if err != nil {
return err
}
var ret JoinResult
if err := json.Unmarshal(jsonBlob, &ret); err != nil {
return err
}
s.volumeSizeLimit = ret.VolumeSizeLimit
s.connected = true
return nil
}
func (s *Store) Close() {
for _, location := range s.locations {
for _, v := range location.volumes {
v.Close()
}
}
}
func (s *Store) Write(i VolumeId, n *Needle) (size uint32, err error) {
if v := s.findVolume(i); v != nil {
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if v.readOnly {
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err = fmt.Errorf("Volume %s is read only!", i)
return
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} else {
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if s.volumeSizeLimit >= v.ContentSize()+uint64(size) {
size, err = v.write(n)
} else {
err = fmt.Errorf("Volume Size Limit %d Exceeded! Current size is %d", s.volumeSizeLimit, v.ContentSize())
}
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if err != nil && s.volumeSizeLimit < v.ContentSize()+uint64(size) && s.volumeSizeLimit >= v.ContentSize() {
glog.V(0).Infoln("volume", i, "size is", v.ContentSize(), "close to", s.volumeSizeLimit)
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if err = s.Join(); err != nil {
glog.V(0).Infoln("error with Join:", err)
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}
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}
}
return
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}
glog.V(0).Infoln("volume", i, "not found!")
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err = fmt.Errorf("Volume %s not found!", i)
return
}
func (s *Store) Delete(i VolumeId, n *Needle) (uint32, error) {
if v := s.findVolume(i); v != nil && !v.readOnly {
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return v.delete(n)
}
return 0, nil
}
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func (s *Store) Read(i VolumeId, n *Needle) (int, error) {
if v := s.findVolume(i); v != nil {
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return v.read(n)
}
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return 0, fmt.Errorf("Volume %s not found!", i)
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}
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func (s *Store) GetVolume(i VolumeId) *Volume {
return s.findVolume(i)
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}
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func (s *Store) HasVolume(i VolumeId) bool {
v := s.findVolume(i)
return v != nil
}