mirror of
https://github.com/seaweedfs/seaweedfs.git
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87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
package storage
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import (
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"fmt"
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"io/ioutil"
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"os"
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"sync"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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"github.com/chrislusf/seaweedfs/weed/util"
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)
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type NeedleMapType int
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const (
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NeedleMapInMemory NeedleMapType = iota
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NeedleMapLevelDb
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NeedleMapBoltDb
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NeedleMapBtree
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)
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const (
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NeedleIndexSize = 16
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)
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type NeedleMapper interface {
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Put(key uint64, offset uint32, size uint32) error
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Get(key uint64) (element *needle.NeedleValue, ok bool)
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Delete(key uint64, offset uint32) error
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Close()
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Destroy() error
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ContentSize() uint64
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DeletedSize() uint64
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FileCount() int
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DeletedCount() int
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MaxFileKey() uint64
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IndexFileSize() uint64
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IndexFileContent() ([]byte, error)
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IndexFileName() string
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}
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type baseNeedleMapper struct {
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indexFile *os.File
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indexFileAccessLock sync.Mutex
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mapMetric
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}
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func (nm *baseNeedleMapper) IndexFileSize() uint64 {
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stat, err := nm.indexFile.Stat()
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if err == nil {
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return uint64(stat.Size())
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}
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return 0
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}
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func (nm *baseNeedleMapper) IndexFileName() string {
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return nm.indexFile.Name()
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}
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func idxFileEntry(bytes []byte) (key uint64, offset uint32, size uint32) {
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key = util.BytesToUint64(bytes[:8])
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offset = util.BytesToUint32(bytes[8:12])
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size = util.BytesToUint32(bytes[12:16])
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return
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}
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func (nm *baseNeedleMapper) appendToIndexFile(key uint64, offset uint32, size uint32) error {
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bytes := make([]byte, 16)
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util.Uint64toBytes(bytes[0:8], key)
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util.Uint32toBytes(bytes[8:12], offset)
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util.Uint32toBytes(bytes[12:16], size)
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nm.indexFileAccessLock.Lock()
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defer nm.indexFileAccessLock.Unlock()
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if _, err := nm.indexFile.Seek(0, 2); err != nil {
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return fmt.Errorf("cannot seek end of indexfile %s: %v",
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nm.indexFile.Name(), err)
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}
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_, err := nm.indexFile.Write(bytes)
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return err
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}
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func (nm *baseNeedleMapper) IndexFileContent() ([]byte, error) {
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nm.indexFileAccessLock.Lock()
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defer nm.indexFileAccessLock.Unlock()
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return ioutil.ReadFile(nm.indexFile.Name())
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}
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