seaweedfs/weed/storage/erasure_coding/ec_volume.go
2019-05-25 23:23:19 -07:00

122 lines
3.1 KiB
Go

package erasure_coding
import (
"fmt"
"math"
"os"
"path"
"sort"
"strconv"
"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
)
type ShardId uint8
type EcVolumeShard struct {
VolumeId needle.VolumeId
ShardId ShardId
Collection string
dir string
ecdFile *os.File
ecxFile *os.File
}
type EcVolumeShards []*EcVolumeShard
func NewEcVolumeShard(dirname string, collection string, id needle.VolumeId, shardId ShardId) (v *EcVolumeShard, e error) {
v = &EcVolumeShard{dir: dirname, Collection: collection, VolumeId: id, ShardId: shardId}
baseFileName := v.FileName()
if v.ecxFile, e = os.OpenFile(baseFileName+".ecx", os.O_RDONLY, 0644); e != nil {
return nil, fmt.Errorf("cannot read ec volume index %s.ecx: %v", baseFileName, e)
}
if v.ecdFile, e = os.OpenFile(baseFileName+ToExt(int(shardId)), os.O_RDONLY, 0644); e != nil {
return nil, fmt.Errorf("cannot read ec volume shard %s.%s: %v", baseFileName, ToExt(int(shardId)), e)
}
return
}
func (shards *EcVolumeShards) AddEcVolumeShard(ecVolumeShard *EcVolumeShard) bool {
for _, s := range *shards {
if s.ShardId == ecVolumeShard.ShardId {
return false
}
}
*shards = append(*shards, ecVolumeShard)
sort.Slice(shards, func(i, j int) bool {
return (*shards)[i].VolumeId < (*shards)[j].VolumeId ||
(*shards)[i].VolumeId == (*shards)[j].VolumeId && (*shards)[i].ShardId < (*shards)[j].ShardId
})
return true
}
func (shards *EcVolumeShards) DeleteEcVolumeShard(ecVolumeShard *EcVolumeShard) bool {
foundPosition := -1
for i, s := range *shards {
if s.ShardId == ecVolumeShard.ShardId {
foundPosition = i
}
}
if foundPosition < 0 {
return false
}
*shards = append((*shards)[:foundPosition], (*shards)[foundPosition+1:]...)
return true
}
func (shards *EcVolumeShards) Close() {
for _, s := range *shards {
s.Close()
}
}
func (shards *EcVolumeShards) ToVolumeEcShardInformationMessage() (messages []*master_pb.VolumeEcShardInformationMessage) {
prevVolumeId := needle.VolumeId(math.MaxUint32)
var m *master_pb.VolumeEcShardInformationMessage
for _, s := range *shards {
if s.VolumeId != prevVolumeId {
m = &master_pb.VolumeEcShardInformationMessage{
Id: uint32(s.VolumeId),
Collection: s.Collection,
}
messages = append(messages, m)
}
prevVolumeId = s.VolumeId
m.EcIndexBits = uint32(ShardBits(m.EcIndexBits).AddShardId(s.ShardId))
}
return
}
func (v *EcVolumeShard) String() string {
return fmt.Sprintf("ec shard %v:%v, dir:%s, Collection:%s", v.VolumeId, v.ShardId, v.dir, v.Collection)
}
func (v *EcVolumeShard) FileName() (fileName string) {
return EcShardFileName(v.Collection, v.dir, int(v.VolumeId))
}
func EcShardFileName(collection string, dir string, id int) (fileName string) {
idString := strconv.Itoa(id)
if collection == "" {
fileName = path.Join(dir, idString)
} else {
fileName = path.Join(dir, collection+"_"+idString)
}
return
}
func (v *EcVolumeShard) Close() {
if v.ecdFile != nil {
_ = v.ecdFile.Close()
v.ecdFile = nil
}
if v.ecxFile != nil {
_ = v.ecxFile.Close()
v.ecxFile = nil
}
}