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