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noop.go
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noop.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 storage
import "github.com/prometheus/prometheus/pkg/labels"
type noopQuerier struct{}
// NoopQuerier is a Querier that does nothing.
func NoopQuerier() Querier {
return noopQuerier{}
}
func (noopQuerier) Select(...*labels.Matcher) (SeriesSet, error) {
return NoopSeriesSet(), nil
}
func (noopQuerier) LabelValues(name string) ([]string, error) {
return nil, nil
}
func (noopQuerier) Close() error {
return nil
}
type noopSeriesSet struct{}
// NoopSeriesSet is a SeriesSet that does nothing.
func NoopSeriesSet() SeriesSet {
return noopSeriesSet{}
}
func (noopSeriesSet) Next() bool {
return false
}
func (noopSeriesSet) At() Series {
return nil
}
func (noopSeriesSet) Err() error {
return nil
}