prometheus/storage/tsdb/tsdb.go

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// Copyright 2017 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tsdb
import (
"context"
"sync"
"time"
"unsafe"
"github.com/alecthomas/units"
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"github.com/go-kit/kit/log"
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"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/storage"
"github.com/prometheus/prometheus/tsdb"
tsdbLabels "github.com/prometheus/prometheus/tsdb/labels"
)
// ErrNotReady is returned if the underlying storage is not ready yet.
var ErrNotReady = errors.New("TSDB not ready")
// ReadyStorage implements the Storage interface while allowing to set the actual
// storage at a later point in time.
type ReadyStorage struct {
mtx sync.RWMutex
a *adapter
}
// Set the storage.
func (s *ReadyStorage) Set(db *tsdb.DB, startTimeMargin int64) {
s.mtx.Lock()
defer s.mtx.Unlock()
s.a = &adapter{db: db, startTimeMargin: startTimeMargin}
}
// Get the storage.
func (s *ReadyStorage) Get() *tsdb.DB {
if x := s.get(); x != nil {
return x.db
}
return nil
}
func (s *ReadyStorage) get() *adapter {
s.mtx.RLock()
x := s.a
s.mtx.RUnlock()
return x
}
// StartTime implements the Storage interface.
func (s *ReadyStorage) StartTime() (int64, error) {
if x := s.get(); x != nil {
return x.StartTime()
}
return int64(model.Latest), ErrNotReady
}
// Querier implements the Storage interface.
func (s *ReadyStorage) Querier(ctx context.Context, mint, maxt int64) (storage.Querier, error) {
if x := s.get(); x != nil {
return x.Querier(ctx, mint, maxt)
}
return nil, ErrNotReady
}
// Appender implements the Storage interface.
func (s *ReadyStorage) Appender() (storage.Appender, error) {
if x := s.get(); x != nil {
return x.Appender()
}
return nil, ErrNotReady
}
// Close implements the Storage interface.
func (s *ReadyStorage) Close() error {
if x := s.Get(); x != nil {
return x.Close()
}
return nil
}
// Adapter return an adapter as storage.Storage.
func Adapter(db *tsdb.DB, startTimeMargin int64) storage.Storage {
return &adapter{db: db, startTimeMargin: startTimeMargin}
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}
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// adapter implements a storage.Storage around TSDB.
type adapter struct {
db *tsdb.DB
startTimeMargin int64
}
// Options of the DB storage.
type Options struct {
// The timestamp range of head blocks after which they get persisted.
// It's the minimum duration of any persisted block.
MinBlockDuration model.Duration
// The maximum timestamp range of compacted blocks.
MaxBlockDuration model.Duration
// The maximum size of each WAL segment file.
WALSegmentSize units.Base2Bytes
// Duration for how long to retain data.
RetentionDuration model.Duration
// Maximum number of bytes to be retained.
MaxBytes units.Base2Bytes
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// Disable creation and consideration of lockfile.
NoLockfile bool
// When true it disables the overlapping blocks check.
// This in-turn enables vertical compaction and vertical query merge.
AllowOverlappingBlocks bool
// When true records in the WAL will be compressed.
WALCompression bool
}
var (
startTime prometheus.GaugeFunc
headMaxTime prometheus.GaugeFunc
headMinTime prometheus.GaugeFunc
)
func registerMetrics(db *tsdb.DB, r prometheus.Registerer) {
startTime = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Name: "prometheus_tsdb_lowest_timestamp_seconds",
Help: "Lowest timestamp value stored in the database.",
}, func() float64 {
bb := db.Blocks()
if len(bb) == 0 {
return float64(db.Head().MinTime()) / 1000
}
return float64(db.Blocks()[0].Meta().MinTime) / 1000
})
headMinTime = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Name: "prometheus_tsdb_head_min_time_seconds",
Help: "Minimum time bound of the head block.",
}, func() float64 {
return float64(db.Head().MinTime()) / 1000
})
headMaxTime = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Name: "prometheus_tsdb_head_max_time_seconds",
Help: "Maximum timestamp of the head block.",
}, func() float64 {
return float64(db.Head().MaxTime()) / 1000
})
if r != nil {
r.MustRegister(
startTime,
headMaxTime,
headMinTime,
)
}
}
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// Open returns a new storage backed by a TSDB database that is configured for Prometheus.
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func Open(path string, l log.Logger, r prometheus.Registerer, opts *Options) (*tsdb.DB, error) {
if opts.MinBlockDuration > opts.MaxBlockDuration {
opts.MaxBlockDuration = opts.MinBlockDuration
}
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// Start with smallest block duration and create exponential buckets until the exceed the
// configured maximum block duration.
rngs := tsdb.ExponentialBlockRanges(int64(time.Duration(opts.MinBlockDuration).Seconds()*1000), 10, 3)
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for i, v := range rngs {
if v > int64(time.Duration(opts.MaxBlockDuration).Seconds()*1000) {
rngs = rngs[:i]
break
}
}
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db, err := tsdb.Open(path, l, r, &tsdb.Options{
WALSegmentSize: int(opts.WALSegmentSize),
RetentionDuration: uint64(time.Duration(opts.RetentionDuration).Seconds() * 1000),
MaxBytes: int64(opts.MaxBytes),
BlockRanges: rngs,
NoLockfile: opts.NoLockfile,
AllowOverlappingBlocks: opts.AllowOverlappingBlocks,
WALCompression: opts.WALCompression,
})
if err != nil {
return nil, err
}
registerMetrics(db, r)
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return db, nil
}
// StartTime implements the Storage interface.
func (a adapter) StartTime() (int64, error) {
var startTime int64
if len(a.db.Blocks()) > 0 {
startTime = a.db.Blocks()[0].Meta().MinTime
} else {
startTime = time.Now().Unix() * 1000
}
// Add a safety margin as it may take a few minutes for everything to spin up.
return startTime + a.startTimeMargin, nil
}
func (a adapter) Querier(_ context.Context, mint, maxt int64) (storage.Querier, error) {
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q, err := a.db.Querier(mint, maxt)
if err != nil {
return nil, err
}
return querier{q: q}, nil
}
// Appender returns a new appender against the storage.
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func (a adapter) Appender() (storage.Appender, error) {
return appender{a: a.db.Appender()}, nil
}
// Close closes the storage and all its underlying resources.
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func (a adapter) Close() error {
return a.db.Close()
}
type querier struct {
q tsdb.Querier
}
func (q querier) Select(_ *storage.SelectParams, oms ...*labels.Matcher) (storage.SeriesSet, storage.Warnings, error) {
ms := make([]tsdbLabels.Matcher, 0, len(oms))
for _, om := range oms {
ms = append(ms, convertMatcher(om))
}
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set, err := q.q.Select(ms...)
if err != nil {
return nil, nil, err
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}
return seriesSet{set: set}, nil, nil
}
func (q querier) LabelValues(name string) ([]string, storage.Warnings, error) {
v, err := q.q.LabelValues(name)
return v, nil, err
}
func (q querier) LabelNames() ([]string, storage.Warnings, error) {
v, err := q.q.LabelNames()
return v, nil, err
}
func (q querier) Close() error { return q.q.Close() }
type seriesSet struct {
set tsdb.SeriesSet
}
func (s seriesSet) Next() bool { return s.set.Next() }
func (s seriesSet) Err() error { return s.set.Err() }
func (s seriesSet) At() storage.Series { return series{s: s.set.At()} }
type series struct {
s tsdb.Series
}
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func (s series) Labels() labels.Labels { return toLabels(s.s.Labels()) }
func (s series) Iterator() storage.SeriesIterator { return storage.SeriesIterator(s.s.Iterator()) }
type appender struct {
a tsdb.Appender
}
func (a appender) Add(lset labels.Labels, t int64, v float64) (uint64, error) {
ref, err := a.a.Add(toTSDBLabels(lset), t, v)
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switch errors.Cause(err) {
case tsdb.ErrNotFound:
return 0, storage.ErrNotFound
case tsdb.ErrOutOfOrderSample:
return 0, storage.ErrOutOfOrderSample
case tsdb.ErrAmendSample:
return 0, storage.ErrDuplicateSampleForTimestamp
case tsdb.ErrOutOfBounds:
return 0, storage.ErrOutOfBounds
}
return ref, err
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}
func (a appender) AddFast(_ labels.Labels, ref uint64, t int64, v float64) error {
err := a.a.AddFast(ref, t, v)
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switch errors.Cause(err) {
case tsdb.ErrNotFound:
return storage.ErrNotFound
case tsdb.ErrOutOfOrderSample:
return storage.ErrOutOfOrderSample
case tsdb.ErrAmendSample:
return storage.ErrDuplicateSampleForTimestamp
case tsdb.ErrOutOfBounds:
return storage.ErrOutOfBounds
}
return err
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}
func (a appender) Commit() error { return a.a.Commit() }
func (a appender) Rollback() error { return a.a.Rollback() }
func convertMatcher(m *labels.Matcher) tsdbLabels.Matcher {
switch m.Type {
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case labels.MatchEqual:
return tsdbLabels.NewEqualMatcher(m.Name, m.Value)
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case labels.MatchNotEqual:
return tsdbLabels.Not(tsdbLabels.NewEqualMatcher(m.Name, m.Value))
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case labels.MatchRegexp:
res, err := tsdbLabels.NewRegexpMatcher(m.Name, "^(?:"+m.Value+")$")
if err != nil {
panic(err)
}
return res
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case labels.MatchNotRegexp:
res, err := tsdbLabels.NewRegexpMatcher(m.Name, "^(?:"+m.Value+")$")
if err != nil {
panic(err)
}
return tsdbLabels.Not(res)
}
panic("storage.convertMatcher: invalid matcher type")
}
func toTSDBLabels(l labels.Labels) tsdbLabels.Labels {
return *(*tsdbLabels.Labels)(unsafe.Pointer(&l))
}
func toLabels(l tsdbLabels.Labels) labels.Labels {
return *(*labels.Labels)(unsafe.Pointer(&l))
}