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encoded_block.go
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encoded_block.go
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// Copyright (c) 2018 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 m3
import (
"github.com/m3db/m3/src/dbnode/encoding"
"github.com/m3db/m3/src/query/block"
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/query/storage/m3/consolidators"
xtime "github.com/m3db/m3/src/x/time"
)
type consolidationSettings struct {
consolidationFn consolidators.ConsolidationFunc
currentTime xtime.UnixNano
bounds models.Bounds
}
type encodedBlock struct {
// There is slightly different execution for the last block in the series.
lastBlock bool
meta block.Metadata
consolidation consolidationSettings
seriesMetas []block.SeriesMeta
seriesBlockIterators []encoding.SeriesIterator
options Options
resultMeta block.ResultMetadata
}
// NewEncodedBlock builds an encoded block.
func NewEncodedBlock(
result consolidators.SeriesFetchResult,
bounds models.Bounds,
lastBlock bool,
opts Options,
) (block.Block, error) {
if err := result.Verify(); err != nil {
return nil, err
}
consolidation := consolidationSettings{
consolidationFn: consolidators.TakeLast,
currentTime: bounds.Start,
bounds: bounds,
}
bl, err := newEncodedBlock(
result,
consolidation,
lastBlock,
opts,
)
if err != nil {
return nil, err
}
return bl, nil
}
func newEncodedBlock(
result consolidators.SeriesFetchResult,
consolidation consolidationSettings,
lastBlock bool,
options Options,
) (*encodedBlock, error) {
count := result.Count()
seriesMetas := make([]block.SeriesMeta, 0, count)
for i := 0; i < count; i++ {
iter, tags, err := result.IterTagsAtIndex(i, options.TagOptions())
if err != nil {
return nil, err
}
seriesMetas = append(seriesMetas, block.SeriesMeta{
Name: iter.ID().Bytes(),
Tags: tags,
})
}
return &encodedBlock{
seriesBlockIterators: result.SeriesIterators(),
consolidation: consolidation,
lastBlock: lastBlock,
resultMeta: result.Metadata,
options: options,
seriesMetas: seriesMetas,
meta: block.Metadata{
Tags: models.NewTags(0, options.TagOptions()),
Bounds: consolidation.bounds,
ResultMetadata: result.Metadata,
},
}, nil
}
func (b *encodedBlock) Close() error {
for _, bl := range b.seriesBlockIterators {
bl.Close()
}
return nil
}
func (b *encodedBlock) Meta() block.Metadata {
return b.meta
}
func (b *encodedBlock) Info() block.BlockInfo {
return block.NewBlockInfo(block.BlockM3TSZCompressed)
}