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48a7a00a38
* Fast path the merge querier such that it is completely removed from query path when there is no remote storage. * Add NoopQuerier * Add copyright notice. * Avoid global, use a function.
55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
// Copyright 2017 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 storage
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import "github.com/prometheus/prometheus/pkg/labels"
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type noopQuerier struct{}
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// NoopQuerier is a Querier that does nothing.
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func NoopQuerier() Querier {
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return noopQuerier{}
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}
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func (noopQuerier) Select(...*labels.Matcher) SeriesSet {
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return NoopSeriesSet()
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}
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func (noopQuerier) LabelValues(name string) ([]string, error) {
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return nil, nil
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}
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func (noopQuerier) Close() error {
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return nil
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}
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type noopSeriesSet struct{}
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// NoopSeriesSet is a SeriesSet that does nothing.
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func NoopSeriesSet() SeriesSet {
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return noopSeriesSet{}
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}
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func (noopSeriesSet) Next() bool {
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return false
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}
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func (noopSeriesSet) At() Series {
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return nil
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}
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func (noopSeriesSet) Err() error {
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return nil
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}
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