70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
package tsdb
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import (
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"math"
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"sync"
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"github.com/fabxc/tsdb/chunks"
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)
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// HeadBlock handles reads and writes of time series data within a time window.
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type HeadBlock struct {
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mtx sync.RWMutex
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descs map[uint64][]*chunkDesc // labels hash to possible chunks descs
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index *memIndex
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samples uint64 // total samples in the block
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highTimestamp int64 // highest timestamp of any sample
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baseTimestamp int64 // all samples are strictly later
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}
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// NewHeadBlock creates a new empty head block.
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func NewHeadBlock(baseTime int64) *HeadBlock {
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return &HeadBlock{
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descs: make(map[uint64][]*chunkDesc, 2048),
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index: newMemIndex(),
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baseTimestamp: baseTime,
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}
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}
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// get retrieves the chunk with the hash and label set and creates
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// a new one if it doesn't exist yet.
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func (h *HeadBlock) get(hash uint64, lset Labels) *chunkDesc {
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cds := h.descs[hash]
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for _, cd := range cds {
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if cd.lset.Equals(lset) {
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return cd
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}
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}
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// None of the given chunks was for the series, create a new one.
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cd := &chunkDesc{
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lset: lset,
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chunk: chunks.NewXORChunk(int(math.MaxInt64)),
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}
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h.index.add(cd)
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h.descs[hash] = append(cds, cd)
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return cd
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}
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// append adds the sample to the headblock.
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func (h *HeadBlock) append(hash uint64, lset Labels, ts int64, v float64) error {
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if err := h.get(hash, lset).append(ts, v); err != nil {
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return err
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}
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h.samples++
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return nil
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}
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type blockStats struct {
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chunks uint32
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samples uint64
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}
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func (h *HeadBlock) stats() *blockStats {
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return &blockStats{
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chunks: uint32(h.index.numSeries()),
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samples: h.samples,
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}
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}
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