prometheus/storage/noop.go
Alin Sinpalean e3b775b78b Simplify BufferedSeriesIterator usage (#4294)
* Allow for BufferedSeriesIterator instances to be created without an underlying iterator, to simplify their usage.

Signed-off-by: Alin Sinpalean <alin.sinpalean@gmail.com>
2018-07-18 05:10:28 +01:00

80 lines
1.7 KiB
Go

// 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 (
"math"
"github.com/prometheus/prometheus/pkg/labels"
)
type noopQuerier struct{}
// NoopQuerier is a Querier that does nothing.
func NoopQuerier() Querier {
return noopQuerier{}
}
func (noopQuerier) Select(*SelectParams, ...*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
}
type noopSeriesIterator struct{}
// NoopSeriesIt is a SeriesIterator that does nothing.
var NoopSeriesIt = noopSeriesIterator{}
func (noopSeriesIterator) At() (int64, float64) {
return math.MinInt64, 0
}
func (noopSeriesIterator) Seek(t int64) bool {
return false
}
func (noopSeriesIterator) Next() bool {
return false
}
func (noopSeriesIterator) Err() error {
return nil
}