mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-01 14:47:38 +00:00
130 lines
3.5 KiB
Go
130 lines
3.5 KiB
Go
package mergeset
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import (
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"encoding/hex"
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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)
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type partHeader struct {
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// The number of items the part contains.
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itemsCount uint64
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// The number of blocks the part contains.
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blocksCount uint64
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// The first item in the part.
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firstItem []byte
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// The last item in the part.
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lastItem []byte
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}
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type partHeaderJSON struct {
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ItemsCount uint64
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BlocksCount uint64
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FirstItem hexString
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LastItem hexString
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}
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type hexString []byte
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func (hs hexString) MarshalJSON() ([]byte, error) {
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h := hex.EncodeToString(hs)
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b := make([]byte, 0, len(h)+2)
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b = append(b, '"')
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b = append(b, h...)
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b = append(b, '"')
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return b, nil
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}
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func (hs *hexString) UnmarshalJSON(data []byte) error {
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if len(data) < 2 {
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return fmt.Errorf("too small data string: got %q; must be at least 2 bytes", data)
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}
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if data[0] != '"' || data[len(data)-1] != '"' {
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return fmt.Errorf("missing heading and/or tailing quotes in the data string %q", data)
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}
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data = data[1 : len(data)-1]
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b, err := hex.DecodeString(string(data))
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if err != nil {
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return fmt.Errorf("cannot hex-decode %q: %w", data, err)
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}
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*hs = b
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return nil
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}
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func (ph *partHeader) Reset() {
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ph.itemsCount = 0
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ph.blocksCount = 0
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ph.firstItem = ph.firstItem[:0]
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ph.lastItem = ph.lastItem[:0]
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}
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func (ph *partHeader) String() string {
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return fmt.Sprintf("partHeader{itemsCount: %d, blocksCount: %d, firstItem: %X, lastItem: %X}",
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ph.itemsCount, ph.blocksCount, ph.firstItem, ph.lastItem)
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}
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func (ph *partHeader) CopyFrom(src *partHeader) {
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ph.itemsCount = src.itemsCount
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ph.blocksCount = src.blocksCount
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ph.firstItem = append(ph.firstItem[:0], src.firstItem...)
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ph.lastItem = append(ph.lastItem[:0], src.lastItem...)
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}
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func (ph *partHeader) MustReadMetadata(partPath string) {
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ph.Reset()
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// Read ph fields from metadata.
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metadataPath := filepath.Join(partPath, metadataFilename)
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metadata, err := os.ReadFile(metadataPath)
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if err != nil {
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logger.Panicf("FATAL: cannot read %q: %s", metadataPath, err)
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}
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var phj partHeaderJSON
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if err := json.Unmarshal(metadata, &phj); err != nil {
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logger.Panicf("FATAL: cannot parse %q: %s", metadataPath, err)
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}
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if phj.ItemsCount <= 0 {
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logger.Panicf("FATAL: part %q cannot contain zero items", partPath)
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}
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ph.itemsCount = phj.ItemsCount
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if phj.BlocksCount <= 0 {
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logger.Panicf("FATAL: part %q cannot contain zero blocks", partPath)
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}
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if phj.BlocksCount > phj.ItemsCount {
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logger.Panicf("FATAL: the number of blocks cannot exceed the number of items in the part %q; got blocksCount=%d, itemsCount=%d",
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partPath, phj.BlocksCount, phj.ItemsCount)
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}
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ph.blocksCount = phj.BlocksCount
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ph.firstItem = append(ph.firstItem[:0], phj.FirstItem...)
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ph.lastItem = append(ph.lastItem[:0], phj.LastItem...)
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}
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func (ph *partHeader) MustWriteMetadata(partPath string) {
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phj := &partHeaderJSON{
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ItemsCount: ph.itemsCount,
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BlocksCount: ph.blocksCount,
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FirstItem: append([]byte{}, ph.firstItem...),
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LastItem: append([]byte{}, ph.lastItem...),
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}
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metadata, err := json.Marshal(&phj)
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if err != nil {
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logger.Panicf("BUG: cannot marshal partHeader metadata: %s", err)
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}
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metadataPath := filepath.Join(partPath, metadataFilename)
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// There is no need in calling fs.MustWriteAtomic() here,
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// since the file is created only once during part creation
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// and the part directory is synced afterward.
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fs.MustWriteSync(metadataPath, metadata)
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}
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