mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-03 18:19:04 +08:00
127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
package storage
|
|
|
|
import (
|
|
"io"
|
|
"os"
|
|
|
|
"github.com/chrislusf/seaweedfs/go/glog"
|
|
"github.com/chrislusf/seaweedfs/go/util"
|
|
)
|
|
|
|
type NeedleMap struct {
|
|
indexFile *os.File
|
|
m CompactMap
|
|
|
|
mapMetric
|
|
}
|
|
|
|
func NewNeedleMap(file *os.File) *NeedleMap {
|
|
nm := &NeedleMap{
|
|
m: NewCompactMap(),
|
|
indexFile: file,
|
|
}
|
|
return nm
|
|
}
|
|
|
|
const (
|
|
RowsToRead = 1024
|
|
)
|
|
|
|
func LoadNeedleMap(file *os.File) (*NeedleMap, error) {
|
|
nm := NewNeedleMap(file)
|
|
e := WalkIndexFile(file, func(key uint64, offset, size uint32) error {
|
|
if key > nm.MaximumFileKey {
|
|
nm.MaximumFileKey = key
|
|
}
|
|
nm.FileCounter++
|
|
nm.FileByteCounter = nm.FileByteCounter + uint64(size)
|
|
if offset > 0 {
|
|
oldSize := nm.m.Set(Key(key), offset, size)
|
|
glog.V(3).Infoln("reading key", key, "offset", offset*NeedlePaddingSize, "size", size, "oldSize", oldSize)
|
|
if oldSize > 0 {
|
|
nm.DeletionCounter++
|
|
nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(oldSize)
|
|
}
|
|
} else {
|
|
oldSize := nm.m.Delete(Key(key))
|
|
glog.V(3).Infoln("removing key", key, "offset", offset*NeedlePaddingSize, "size", size, "oldSize", oldSize)
|
|
nm.DeletionCounter++
|
|
nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(oldSize)
|
|
}
|
|
return nil
|
|
})
|
|
glog.V(1).Infoln("max file key:", nm.MaximumFileKey)
|
|
return nm, e
|
|
}
|
|
|
|
// walks through the index file, calls fn function with each key, offset, size
|
|
// stops with the error returned by the fn function
|
|
func WalkIndexFile(r *os.File, fn func(key uint64, offset, size uint32) error) error {
|
|
var readerOffset int64
|
|
bytes := make([]byte, 16*RowsToRead)
|
|
count, e := r.ReadAt(bytes, readerOffset)
|
|
glog.V(3).Infoln("file", r.Name(), "readerOffset", readerOffset, "count", count, "e", e)
|
|
readerOffset += int64(count)
|
|
var (
|
|
key uint64
|
|
offset, size uint32
|
|
i int
|
|
)
|
|
|
|
for count > 0 && e == nil || e == io.EOF {
|
|
for i = 0; i+16 <= count; i += 16 {
|
|
key = util.BytesToUint64(bytes[i : i+8])
|
|
offset = util.BytesToUint32(bytes[i+8 : i+12])
|
|
size = util.BytesToUint32(bytes[i+12 : i+16])
|
|
if e = fn(key, offset, size); e != nil {
|
|
return e
|
|
}
|
|
}
|
|
if e == io.EOF {
|
|
return nil
|
|
}
|
|
count, e = r.ReadAt(bytes, readerOffset)
|
|
glog.V(3).Infoln("file", r.Name(), "readerOffset", readerOffset, "count", count, "e", e)
|
|
readerOffset += int64(count)
|
|
}
|
|
return e
|
|
}
|
|
|
|
func (nm *NeedleMap) Put(key uint64, offset uint32, size uint32) error {
|
|
oldSize := nm.m.Set(Key(key), offset, size)
|
|
nm.logPut(key, oldSize, size)
|
|
return appendToIndexFile(nm.indexFile, key, offset, size)
|
|
}
|
|
func (nm *NeedleMap) Get(key uint64) (element *NeedleValue, ok bool) {
|
|
element, ok = nm.m.Get(Key(key))
|
|
return
|
|
}
|
|
func (nm *NeedleMap) Delete(key uint64) error {
|
|
deletedBytes := nm.m.Delete(Key(key))
|
|
nm.logDelete(deletedBytes)
|
|
return appendToIndexFile(nm.indexFile, key, 0, 0)
|
|
}
|
|
func (nm *NeedleMap) Close() {
|
|
_ = nm.indexFile.Close()
|
|
}
|
|
func (nm *NeedleMap) Destroy() error {
|
|
nm.Close()
|
|
return os.Remove(nm.indexFile.Name())
|
|
}
|
|
func (nm NeedleMap) ContentSize() uint64 {
|
|
return nm.FileByteCounter
|
|
}
|
|
func (nm NeedleMap) DeletedSize() uint64 {
|
|
return nm.DeletionByteCounter
|
|
}
|
|
func (nm NeedleMap) FileCount() int {
|
|
return nm.FileCounter
|
|
}
|
|
func (nm NeedleMap) DeletedCount() int {
|
|
return nm.DeletionCounter
|
|
}
|
|
|
|
func (nm NeedleMap) MaxFileKey() uint64 {
|
|
return nm.MaximumFileKey
|
|
}
|