mirror of
https://github.com/prometheus/prometheus.git
synced 2024-09-20 15:57:31 -07:00
8fa18d564a
This extracts Querier as an instantiateable and closeable object rather than just defining extending methods of the storage interface. This improves composability and allows abstracting query transactions, which can be useful for transaction-level caches, consistent data views, and encapsulating teardown.
98 lines
2.8 KiB
Go
98 lines
2.8 KiB
Go
// Copyright 2016 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 local
|
|
|
|
import (
|
|
"time"
|
|
|
|
"github.com/prometheus/common/model"
|
|
"golang.org/x/net/context"
|
|
|
|
"github.com/prometheus/prometheus/storage/metric"
|
|
)
|
|
|
|
// NoopStorage is a dummy storage for use when Prometheus's local storage is
|
|
// disabled. It throws away any appended samples and returns empty results.
|
|
type NoopStorage struct{}
|
|
|
|
// Start implements Storage.
|
|
func (s *NoopStorage) Start() (err error) {
|
|
return nil
|
|
}
|
|
|
|
// Stop implements Storage.
|
|
func (s *NoopStorage) Stop() error {
|
|
return nil
|
|
}
|
|
|
|
// WaitForIndexing implements Storage.
|
|
func (s *NoopStorage) WaitForIndexing() {
|
|
}
|
|
|
|
// Querier implements Storage.
|
|
func (s *NoopStorage) Querier() (Querier, error) {
|
|
return &NoopQuerier{}, nil
|
|
}
|
|
|
|
type NoopQuerier struct{}
|
|
|
|
// Close implements Querier.
|
|
func (s *NoopQuerier) Close() error {
|
|
return nil
|
|
}
|
|
|
|
// LastSampleForLabelMatchers implements Querier.
|
|
func (s *NoopQuerier) LastSampleForLabelMatchers(ctx context.Context, cutoff model.Time, matcherSets ...metric.LabelMatchers) (model.Vector, error) {
|
|
return nil, nil
|
|
}
|
|
|
|
// QueryRange implements Querier
|
|
func (s *NoopQuerier) QueryRange(ctx context.Context, from, through model.Time, matchers ...*metric.LabelMatcher) ([]SeriesIterator, error) {
|
|
return nil, nil
|
|
}
|
|
|
|
// QueryInstant implements Querier.
|
|
func (s *NoopQuerier) QueryInstant(ctx context.Context, ts model.Time, stalenessDelta time.Duration, matchers ...*metric.LabelMatcher) ([]SeriesIterator, error) {
|
|
return nil, nil
|
|
}
|
|
|
|
// MetricsForLabelMatchers implements Querier.
|
|
func (s *NoopQuerier) MetricsForLabelMatchers(
|
|
ctx context.Context,
|
|
from, through model.Time,
|
|
matcherSets ...metric.LabelMatchers,
|
|
) ([]metric.Metric, error) {
|
|
return nil, nil
|
|
}
|
|
|
|
// LabelValuesForLabelName implements Querier.
|
|
func (s *NoopQuerier) LabelValuesForLabelName(ctx context.Context, labelName model.LabelName) (model.LabelValues, error) {
|
|
return nil, nil
|
|
}
|
|
|
|
// DropMetricsForLabelMatchers implements Storage.
|
|
func (s *NoopStorage) DropMetricsForLabelMatchers(ctx context.Context, matchers ...*metric.LabelMatcher) (int, error) {
|
|
return 0, nil
|
|
}
|
|
|
|
// Append implements Storage.
|
|
func (s *NoopStorage) Append(sample *model.Sample) error {
|
|
return nil
|
|
}
|
|
|
|
// NeedsThrottling implements Storage.
|
|
func (s *NoopStorage) NeedsThrottling() bool {
|
|
return false
|
|
}
|