mirror of
https://github.com/prometheus/prometheus
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132 lines
3.5 KiB
Go
132 lines
3.5 KiB
Go
// Copyright 2020 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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// This file holds boilerplate adapters for generic MergeSeriesSet and MergeQuerier functions, so we can have one optimized
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// solution that works for both ChunkSeriesSet as well as SeriesSet.
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package storage
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import "github.com/prometheus/prometheus/pkg/labels"
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type genericQuerier interface {
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baseQuerier
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Select(bool, *SelectHints, ...*labels.Matcher) (genericSeriesSet, Warnings, error)
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}
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type genericSeriesSet interface {
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Next() bool
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At() Labels
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Err() error
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}
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type genericSeriesMergeFunc func(...Labels) Labels
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type genericSeriesSetAdapter struct {
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SeriesSet
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}
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func (a *genericSeriesSetAdapter) At() Labels {
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return a.SeriesSet.At()
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}
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type genericChunkSeriesSetAdapter struct {
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ChunkSeriesSet
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}
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func (a *genericChunkSeriesSetAdapter) At() Labels {
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return a.ChunkSeriesSet.At()
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}
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type genericQuerierAdapter struct {
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baseQuerier
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// One-of. If both are set, Querier will be used.
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q Querier
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cq ChunkQuerier
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}
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func (q *genericQuerierAdapter) Select(sortSeries bool, hints *SelectHints, matchers ...*labels.Matcher) (genericSeriesSet, Warnings, error) {
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if q.q != nil {
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s, w, err := q.q.Select(sortSeries, hints, matchers...)
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return &genericSeriesSetAdapter{s}, w, err
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}
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s, w, err := q.cq.Select(sortSeries, hints, matchers...)
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return &genericChunkSeriesSetAdapter{s}, w, err
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}
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func newGenericQuerierFrom(q Querier) genericQuerier {
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return &genericQuerierAdapter{baseQuerier: q, q: q}
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}
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func newGenericQuerierFromChunk(cq ChunkQuerier) genericQuerier {
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return &genericQuerierAdapter{baseQuerier: cq, cq: cq}
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}
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type querierAdapter struct {
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genericQuerier
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}
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type seriesSetAdapter struct {
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genericSeriesSet
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}
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func (a *seriesSetAdapter) At() Series {
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return a.genericSeriesSet.At().(Series)
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}
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func (q *querierAdapter) Select(sortSeries bool, hints *SelectHints, matchers ...*labels.Matcher) (SeriesSet, Warnings, error) {
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s, w, err := q.genericQuerier.Select(sortSeries, hints, matchers...)
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return &seriesSetAdapter{s}, w, err
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}
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type chunkQuerierAdapter struct {
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genericQuerier
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}
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type chunkSeriesSetAdapter struct {
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genericSeriesSet
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}
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func (a *chunkSeriesSetAdapter) At() ChunkSeries {
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return a.genericSeriesSet.At().(ChunkSeries)
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}
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func (q *chunkQuerierAdapter) Select(sortSeries bool, hints *SelectHints, matchers ...*labels.Matcher) (ChunkSeriesSet, Warnings, error) {
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s, w, err := q.genericQuerier.Select(sortSeries, hints, matchers...)
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return &chunkSeriesSetAdapter{s}, w, err
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}
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type seriesMergerAdapter struct {
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VerticalSeriesMergeFunc
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}
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func (a *seriesMergerAdapter) Merge(s ...Labels) Labels {
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buf := make([]Series, 0, len(s))
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for _, ser := range s {
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buf = append(buf, ser.(Series))
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}
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return a.VerticalSeriesMergeFunc(buf...)
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}
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type chunkSeriesMergerAdapter struct {
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VerticalChunkSeriesMergerFunc
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}
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func (a *chunkSeriesMergerAdapter) Merge(s ...Labels) Labels {
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buf := make([]ChunkSeries, 0, len(s))
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for _, ser := range s {
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buf = append(buf, ser.(ChunkSeries))
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}
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return a.VerticalChunkSeriesMergerFunc(buf...)
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}
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