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series_iterator_builder.go
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/
series_iterator_builder.go
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// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package parser
import (
"io"
"time"
"github.com/m3db/m3/src/dbnode/encoding"
"github.com/m3db/m3/src/dbnode/encoding/m3tsz"
"github.com/m3db/m3/src/dbnode/namespace"
"github.com/m3db/m3/src/dbnode/ts"
"github.com/m3db/m3/src/dbnode/x/xio"
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/x/ident"
xtime "github.com/m3db/m3/src/x/time"
)
const sep rune = '!'
const tagSep rune = '.'
// Data is a set of datapoints.
type Data []ts.Datapoint
// IngestSeries is a series that can be ingested by the parser.
type IngestSeries struct {
Datapoints []Data
Tags Tags
}
var iterAlloc = func(r io.Reader, _ namespace.SchemaDescr) encoding.ReaderIterator {
return m3tsz.NewReaderIterator(r, m3tsz.DefaultIntOptimizationEnabled, encoding.NewOptions())
}
func buildBlockReader(
block Data,
start time.Time,
blockSize time.Duration,
opts Options,
) ([]xio.BlockReader, error) {
encoder := opts.EncoderPool.Get()
encoder.Reset(time.Now(), len(block), nil)
for _, dp := range block {
err := encoder.Encode(dp, xtime.Second, nil)
if err != nil {
encoder.Close()
return nil, err
}
}
segment := encoder.Discard()
return []xio.BlockReader{
{
SegmentReader: xio.NewSegmentReader(segment),
Start: start,
BlockSize: blockSize,
},
}, nil
}
func buildTagIteratorAndID(
parsedTags Tags,
opts models.TagOptions,
) (ident.TagIterator, ident.ID) {
var (
tags = ident.Tags{}
modelTags = models.NewTags(len(parsedTags), opts)
)
for _, tag := range parsedTags {
name := tag.Name()
value := tag.Value()
modelTags = modelTags.AddOrUpdateTag(models.Tag{
Name: []byte(name),
Value: []byte(value),
})
tags.Append(ident.StringTag(name, value))
}
id := string(modelTags.ID())
return ident.NewTagsIterator(tags), ident.StringID(id)
}
func buildSeriesIterator(
series IngestSeries,
start time.Time,
blockSize time.Duration,
opts Options,
) (encoding.SeriesIterator, error) {
var (
points = series.Datapoints
tags = series.Tags
readers = make([][]xio.BlockReader, 0, len(points))
)
blockStart := start
for _, block := range points {
seriesBlock, err := buildBlockReader(block, blockStart, blockSize, opts)
if err != nil {
return nil, err
}
readers = append(readers, seriesBlock)
blockStart = blockStart.Add(blockSize)
}
multiReader := encoding.NewMultiReaderIterator(
iterAlloc,
opts.IteratorPools.MultiReaderIterator(),
)
sliceOfSlicesIter := xio.NewReaderSliceOfSlicesFromBlockReadersIterator(readers)
multiReader.ResetSliceOfSlices(sliceOfSlicesIter, nil)
end := start.Add(blockSize)
if len(points) > 0 {
lastBlock := points[len(points)-1]
end = lastBlock[len(lastBlock)-1].Timestamp
}
tagIter, id := buildTagIteratorAndID(tags, opts.TagOptions)
return encoding.NewSeriesIterator(
encoding.SeriesIteratorOptions{
ID: id,
Namespace: ident.StringID("ns"),
Tags: tagIter,
StartInclusive: xtime.ToUnixNano(start),
EndExclusive: xtime.ToUnixNano(end),
Replicas: []encoding.MultiReaderIterator{
multiReader,
},
}, nil), nil
}
// BuildSeriesIterators builds series iterators from parser data.
func BuildSeriesIterators(
series []IngestSeries,
start time.Time,
blockSize time.Duration,
opts Options,
) (encoding.SeriesIterators, error) {
iters := make([]encoding.SeriesIterator, 0, len(series))
for _, s := range series {
iter, err := buildSeriesIterator(s, start, blockSize, opts)
if err != nil {
return nil, err
}
iters = append(iters, iter)
}
return encoding.NewSeriesIterators(
iters,
opts.IteratorPools.MutableSeriesIterators(),
), nil
}