352 lines
7.5 KiB
Go
352 lines
7.5 KiB
Go
package tsdb
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import (
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"encoding/binary"
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"fmt"
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"hash/crc32"
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"io"
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"os"
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"sort"
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"unsafe"
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)
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const (
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// MagicSeries 4 bytes at the head of series file.
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MagicSeries = 0x85BD40DD
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// MagicIndex 4 bytes at the head of an index file.
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MagicIndex = 0xBAAAD700
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)
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// SeriesWriter serializes a time block of chunked series data.
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type SeriesWriter interface {
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// WriteSeries writes the time series data chunks for a single series.
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WriteSeries(Labels, []*chunkDesc) error
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// Size returns the size of the data written so far.
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Size() int64
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// Close writes any required finalization and closes the resources
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// associated with the underlying writer.
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Close() error
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}
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// seriesWriter implements the SeriesWriter interface for the standard
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// serialization format.
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type seriesWriter struct {
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w io.Writer
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n int64
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c int
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baseTimestamp int64
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index IndexWriter
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}
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func newSeriesWriter(w io.Writer, index IndexWriter, base int64) *seriesWriter {
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return &seriesWriter{
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w: w,
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n: 0,
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index: index,
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baseTimestamp: base,
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}
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}
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func (w *seriesWriter) write(wr io.Writer, b []byte) error {
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n, err := wr.Write(b)
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w.n += int64(n)
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return err
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}
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func (w *seriesWriter) writeMeta() error {
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meta := &meta{magic: MagicSeries, flag: flagStd}
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metab := ((*[metaSize]byte)(unsafe.Pointer(meta)))[:]
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return w.write(w.w, metab)
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}
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func (w *seriesWriter) WriteSeries(lset Labels, chks []*chunkDesc) error {
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// Initialize with meta data.
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if w.n == 0 {
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if err := w.writeMeta(); err != nil {
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return err
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}
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}
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// TODO(fabxc): is crc32 enough for chunks of one series?
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h := crc32.NewIEEE()
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wr := io.MultiWriter(h, w.w)
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l := uint32(0)
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for _, cd := range chks {
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l += uint32(len(cd.chunk.Bytes()))
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}
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// For normal reads we don't need the length of the chunk section but
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// it allows us to verify checksums without reading the index file.
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if err := w.write(wr, ((*[4]byte)(unsafe.Pointer(&l)))[:]); err != nil {
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return err
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}
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offsets := make([]ChunkOffset, 0, len(chks))
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lastTimestamp := w.baseTimestamp
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for _, cd := range chks {
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offsets = append(offsets, ChunkOffset{
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Value: lastTimestamp,
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Offset: uint32(w.n),
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})
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if err := w.write(wr, []byte{byte(cd.chunk.Encoding())}); err != nil {
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return err
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}
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if err := w.write(wr, cd.chunk.Bytes()); err != nil {
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return err
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}
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lastTimestamp = cd.lastTimestamp
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}
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if err := w.write(w.w, h.Sum(nil)); err != nil {
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return err
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}
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if w.index != nil {
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w.index.AddOffsets(lset, offsets...)
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}
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return nil
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}
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func (w *seriesWriter) Size() int64 {
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return w.n
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}
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func (w *seriesWriter) Close() error {
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if f, ok := w.w.(*os.File); ok {
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if err := f.Sync(); err != nil {
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return err
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}
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}
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if c, ok := w.w.(io.Closer); ok {
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return c.Close()
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}
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return nil
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}
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type ChunkOffset struct {
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Value int64
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Offset uint32
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}
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type BlockStats struct {
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}
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// IndexWriter serialized the index for a block of series data.
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// The methods must generally be called in order they are specified.
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type IndexWriter interface {
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// AddOffsets populates the index writer with offsets of chunks
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// for a series that the index can reference.
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AddOffsets(Labels, ...ChunkOffset)
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// WriteStats writes final stats for the indexed block.
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WriteStats(*BlockStats) error
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// WriteLabelIndex serializes an index from label names to values.
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// The passed in values chained tuples of strings of the length of names.
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WriteLabelIndex(names []string, values []string) error
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// WritesSeries serializes series identifying labels.
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WriteSeries(ref uint32, ls ...Labels) error
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// WritePostings writes a postings list for a single label pair.
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WritePostings(name, value string, it Iterator) error
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// Size returns the size of the data written so far.
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Size() int64
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// Close writes any finalization and closes theresources associated with
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// the underlying writer.
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Close() error
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}
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// indexWriter implements the IndexWriter interface for the standard
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// serialization format.
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type indexWriter struct {
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w io.Writer
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n int64
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series []Labels
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offsets [][]ChunkOffset
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symbols map[string]uint32 // symbol offsets
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labelIndexes []hashEntry // label index offsets
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}
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func newIndexWriter(w io.Writer) *indexWriter {
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return &indexWriter{
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w: w,
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n: 0,
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symbols: make(map[string]uint32, 4096),
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labelIndexes: make([]hashEntry, 10),
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}
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}
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func (w *indexWriter) write(wr io.Writer, b []byte) error {
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n, err := wr.Write(b)
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w.n += int64(n)
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return err
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}
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func (w *indexWriter) writeMeta() error {
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meta := &meta{magic: MagicSeries, flag: flagStd}
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metab := ((*[metaSize]byte)(unsafe.Pointer(meta)))[:]
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return w.write(w.w, metab)
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}
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func (w *indexWriter) AddOffsets(lset Labels, offsets ...ChunkOffset) {
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w.series = append(w.series, lset)
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w.offsets = append(w.offsets, offsets)
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// Populate the symbol table from all label sets we have to reference.
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for _, l := range lset {
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w.symbols[l.Name] = 0
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w.symbols[l.Value] = 0
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}
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}
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func (w *indexWriter) WriteStats(*BlockStats) error {
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if w.n == 0 {
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if err := w.writeMeta(); err != nil {
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return err
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}
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if err := w.writeSymbols(); err != nil {
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return err
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}
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}
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return nil
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}
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func (w *indexWriter) writeSymbols() error {
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// Generate sorted list of strings we will store as reference table.
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symbols := make([]string, 0, len(w.symbols))
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for s := range w.symbols {
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symbols = append(symbols, s)
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}
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sort.Strings(symbols)
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buf := make([]byte, binary.MaxVarintLen32)
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b := append(make([]byte, 4096), flagStd)
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for _, s := range symbols {
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w.symbols[s] = uint32(w.n) + uint32(len(b))
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n := binary.PutUvarint(buf, uint64(len(s)))
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b = append(b, buf[:n]...)
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b = append(b, s...)
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}
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h := crc32.NewIEEE()
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wr := io.MultiWriter(h, w.w)
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l := len(b)
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if err := w.write(wr, ((*[4]byte)(unsafe.Pointer(&l)))[:]); err != nil {
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return err
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}
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if err := w.write(wr, b); err != nil {
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return err
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}
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return w.write(w.w, h.Sum(nil))
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}
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func (w *indexWriter) WriteLabelIndex(names []string, values []string) error {
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if len(names) != 1 {
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return fmt.Errorf("not supported")
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}
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sort.Strings(values)
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h := crc32.NewIEEE()
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wr := io.MultiWriter(h, w.w)
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w.labelIndexes = append(w.labelIndexes, hashEntry{
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name: names[0],
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offset: uint32(w.n),
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})
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l := 1 + len(values)*4
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if err := w.write(wr, ((*[4]byte)(unsafe.Pointer(&l)))[:]); err != nil {
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return err
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}
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if err := w.write(wr, []byte{flagStd}); err != nil {
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return err
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}
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for _, v := range values {
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o := w.symbols[v]
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b := ((*[4]byte)(unsafe.Pointer(&o)))[:]
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if err := w.write(wr, b); err != nil {
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return err
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}
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}
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return w.write(w.w, h.Sum(nil))
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}
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func (w *indexWriter) WriteSeries(ref uint32, ls ...Labels) error {
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return nil
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}
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func (w *indexWriter) WritePostings(name, value string, it Iterator) error {
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return nil
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}
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func (w *indexWriter) Size() int64 {
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return w.n
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}
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type hashEntry struct {
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name string
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offset uint32
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}
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const hashEntrySize = uint32(unsafe.Sizeof(hashEntry{}))
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func (w *indexWriter) finalize() error {
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l := 1 + uint32(len(w.labelIndexes))*hashEntrySize
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if err := w.write(w.w, ((*[4]byte)(unsafe.Pointer(&l)))[:]); err != nil {
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return err
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}
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if err := w.write(w.w, []byte{flagStd}); err != nil {
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return err
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}
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for _, e := range w.labelIndexes {
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b := ((*[hashEntrySize]byte)(unsafe.Pointer(&e)))[:]
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if err := w.write(w.w, b); err != nil {
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return nil
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}
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}
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return nil
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}
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func (w *indexWriter) Close() error {
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if err := w.finalize(); err != nil {
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return err
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}
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if f, ok := w.w.(*os.File); ok {
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if err := f.Sync(); err != nil {
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return err
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}
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}
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if c, ok := w.w.(io.Closer); ok {
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return c.Close()
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}
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return nil
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}
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