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319 lines
8.3 KiB
319 lines
8.3 KiB
// Copyright 2018 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package record contains the various record types used for encoding various Head block data in the WAL and in-memory snapshot.
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package record
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import (
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"math"
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"sort"
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"github.com/pkg/errors"
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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/storage"
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"github.com/prometheus/prometheus/tsdb/chunks"
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"github.com/prometheus/prometheus/tsdb/encoding"
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"github.com/prometheus/prometheus/tsdb/tombstones"
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)
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// Type represents the data type of a record.
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type Type uint8
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const (
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// Unknown is returned for unrecognised WAL record types.
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Unknown Type = 255
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// Series is used to match WAL records of type Series.
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Series Type = 1
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// Samples is used to match WAL records of type Samples.
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Samples Type = 2
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// Tombstones is used to match WAL records of type Tombstones.
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Tombstones Type = 3
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// Exemplars is used to match WAL records of type Exemplars.
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Exemplars Type = 4
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)
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// ErrNotFound is returned if a looked up resource was not found. Duplicate ErrNotFound from head.go.
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var ErrNotFound = errors.New("not found")
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// RefSeries is the series labels with the series ID.
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type RefSeries struct {
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Ref chunks.HeadSeriesRef
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Labels labels.Labels
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}
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// RefSample is a timestamp/value pair associated with a reference to a series.
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type RefSample struct {
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Ref chunks.HeadSeriesRef
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T int64
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V float64
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}
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// RefExemplar is an exemplar with it's labels, timestamp, value the exemplar was collected/observed with, and a reference to a series.
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type RefExemplar struct {
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Ref chunks.HeadSeriesRef
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T int64
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V float64
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Labels labels.Labels
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}
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// Decoder decodes series, sample, and tombstone records.
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// The zero value is ready to use.
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type Decoder struct{}
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// Type returns the type of the record.
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// Returns RecordUnknown if no valid record type is found.
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func (d *Decoder) Type(rec []byte) Type {
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if len(rec) < 1 {
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return Unknown
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}
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switch t := Type(rec[0]); t {
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case Series, Samples, Tombstones, Exemplars:
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return t
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}
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return Unknown
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}
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// Series appends series in rec to the given slice.
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func (d *Decoder) Series(rec []byte, series []RefSeries) ([]RefSeries, error) {
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dec := encoding.Decbuf{B: rec}
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if Type(dec.Byte()) != Series {
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return nil, errors.New("invalid record type")
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}
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for len(dec.B) > 0 && dec.Err() == nil {
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ref := storage.SeriesRef(dec.Be64())
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lset := make(labels.Labels, dec.Uvarint())
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for i := range lset {
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lset[i].Name = dec.UvarintStr()
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lset[i].Value = dec.UvarintStr()
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}
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sort.Sort(lset)
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series = append(series, RefSeries{
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Ref: chunks.HeadSeriesRef(ref),
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Labels: lset,
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})
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}
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if dec.Err() != nil {
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return nil, dec.Err()
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}
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if len(dec.B) > 0 {
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return nil, errors.Errorf("unexpected %d bytes left in entry", len(dec.B))
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}
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return series, nil
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}
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// Samples appends samples in rec to the given slice.
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func (d *Decoder) Samples(rec []byte, samples []RefSample) ([]RefSample, error) {
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dec := encoding.Decbuf{B: rec}
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if Type(dec.Byte()) != Samples {
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return nil, errors.New("invalid record type")
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}
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if dec.Len() == 0 {
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return samples, nil
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}
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var (
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baseRef = dec.Be64()
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baseTime = dec.Be64int64()
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)
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for len(dec.B) > 0 && dec.Err() == nil {
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dref := dec.Varint64()
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dtime := dec.Varint64()
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val := dec.Be64()
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samples = append(samples, RefSample{
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Ref: chunks.HeadSeriesRef(int64(baseRef) + dref),
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T: baseTime + dtime,
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V: math.Float64frombits(val),
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})
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}
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if dec.Err() != nil {
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return nil, errors.Wrapf(dec.Err(), "decode error after %d samples", len(samples))
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}
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if len(dec.B) > 0 {
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return nil, errors.Errorf("unexpected %d bytes left in entry", len(dec.B))
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}
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return samples, nil
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}
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// Tombstones appends tombstones in rec to the given slice.
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func (d *Decoder) Tombstones(rec []byte, tstones []tombstones.Stone) ([]tombstones.Stone, error) {
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dec := encoding.Decbuf{B: rec}
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if Type(dec.Byte()) != Tombstones {
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return nil, errors.New("invalid record type")
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}
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for dec.Len() > 0 && dec.Err() == nil {
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tstones = append(tstones, tombstones.Stone{
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Ref: storage.SeriesRef(dec.Be64()),
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Intervals: tombstones.Intervals{
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{Mint: dec.Varint64(), Maxt: dec.Varint64()},
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},
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})
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}
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if dec.Err() != nil {
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return nil, dec.Err()
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}
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if len(dec.B) > 0 {
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return nil, errors.Errorf("unexpected %d bytes left in entry", len(dec.B))
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}
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return tstones, nil
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}
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func (d *Decoder) Exemplars(rec []byte, exemplars []RefExemplar) ([]RefExemplar, error) {
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dec := encoding.Decbuf{B: rec}
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t := Type(dec.Byte())
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if t != Exemplars {
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return nil, errors.New("invalid record type")
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}
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return d.ExemplarsFromBuffer(&dec, exemplars)
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}
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func (d *Decoder) ExemplarsFromBuffer(dec *encoding.Decbuf, exemplars []RefExemplar) ([]RefExemplar, error) {
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if dec.Len() == 0 {
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return exemplars, nil
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}
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var (
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baseRef = dec.Be64()
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baseTime = dec.Be64int64()
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)
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for len(dec.B) > 0 && dec.Err() == nil {
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dref := dec.Varint64()
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dtime := dec.Varint64()
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val := dec.Be64()
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lset := make(labels.Labels, dec.Uvarint())
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for i := range lset {
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lset[i].Name = dec.UvarintStr()
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lset[i].Value = dec.UvarintStr()
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}
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sort.Sort(lset)
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exemplars = append(exemplars, RefExemplar{
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Ref: chunks.HeadSeriesRef(baseRef + uint64(dref)),
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T: baseTime + dtime,
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V: math.Float64frombits(val),
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Labels: lset,
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})
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}
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if dec.Err() != nil {
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return nil, errors.Wrapf(dec.Err(), "decode error after %d exemplars", len(exemplars))
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}
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if len(dec.B) > 0 {
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return nil, errors.Errorf("unexpected %d bytes left in entry", len(dec.B))
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}
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return exemplars, nil
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}
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// Encoder encodes series, sample, and tombstones records.
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// The zero value is ready to use.
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type Encoder struct{}
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// Series appends the encoded series to b and returns the resulting slice.
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func (e *Encoder) Series(series []RefSeries, b []byte) []byte {
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buf := encoding.Encbuf{B: b}
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buf.PutByte(byte(Series))
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for _, s := range series {
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buf.PutBE64(uint64(s.Ref))
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buf.PutUvarint(len(s.Labels))
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for _, l := range s.Labels {
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buf.PutUvarintStr(l.Name)
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buf.PutUvarintStr(l.Value)
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}
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}
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return buf.Get()
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}
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// Samples appends the encoded samples to b and returns the resulting slice.
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func (e *Encoder) Samples(samples []RefSample, b []byte) []byte {
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buf := encoding.Encbuf{B: b}
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buf.PutByte(byte(Samples))
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if len(samples) == 0 {
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return buf.Get()
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}
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// Store base timestamp and base reference number of first sample.
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// All samples encode their timestamp and ref as delta to those.
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first := samples[0]
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buf.PutBE64(uint64(first.Ref))
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buf.PutBE64int64(first.T)
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for _, s := range samples {
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buf.PutVarint64(int64(s.Ref) - int64(first.Ref))
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buf.PutVarint64(s.T - first.T)
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buf.PutBE64(math.Float64bits(s.V))
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}
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return buf.Get()
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}
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// Tombstones appends the encoded tombstones to b and returns the resulting slice.
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func (e *Encoder) Tombstones(tstones []tombstones.Stone, b []byte) []byte {
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buf := encoding.Encbuf{B: b}
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buf.PutByte(byte(Tombstones))
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for _, s := range tstones {
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for _, iv := range s.Intervals {
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buf.PutBE64(uint64(s.Ref))
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buf.PutVarint64(iv.Mint)
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buf.PutVarint64(iv.Maxt)
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}
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}
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return buf.Get()
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}
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func (e *Encoder) Exemplars(exemplars []RefExemplar, b []byte) []byte {
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buf := encoding.Encbuf{B: b}
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buf.PutByte(byte(Exemplars))
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if len(exemplars) == 0 {
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return buf.Get()
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}
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e.EncodeExemplarsIntoBuffer(exemplars, &buf)
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return buf.Get()
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}
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func (e *Encoder) EncodeExemplarsIntoBuffer(exemplars []RefExemplar, buf *encoding.Encbuf) {
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// Store base timestamp and base reference number of first sample.
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// All samples encode their timestamp and ref as delta to those.
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first := exemplars[0]
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buf.PutBE64(uint64(first.Ref))
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buf.PutBE64int64(first.T)
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for _, ex := range exemplars {
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buf.PutVarint64(int64(ex.Ref) - int64(first.Ref))
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buf.PutVarint64(ex.T - first.T)
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buf.PutBE64(math.Float64bits(ex.V))
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buf.PutUvarint(len(ex.Labels))
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for _, l := range ex.Labels {
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buf.PutUvarintStr(l.Name)
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buf.PutUvarintStr(l.Value)
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}
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}
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}
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