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c187308366
This is based on https://github.com/prometheus/prometheus/pull/1997. This adds contexts to the relevant Storage methods and already passes PromQL's new per-query context into the storage's query methods. The immediate motivation supporting multi-tenancy in Frankenstein, but this could also be used by Prometheus's normal local storage to support cancellations and timeouts at some point.
86 lines
2.6 KiB
Go
86 lines
2.6 KiB
Go
// Copyright 2016 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 local
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import (
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"time"
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"github.com/prometheus/common/model"
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"golang.org/x/net/context"
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"github.com/prometheus/prometheus/storage/metric"
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)
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// NoopStorage is a dummy storage for use when Prometheus's local storage is
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// disabled. It throws away any appended samples and returns empty results.
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type NoopStorage struct{}
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// Start implements Storage.
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func (s *NoopStorage) Start() (err error) {
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return nil
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}
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// Stop implements Storage.
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func (s *NoopStorage) Stop() error {
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return nil
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}
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// WaitForIndexing implements Storage.
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func (s *NoopStorage) WaitForIndexing() {
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}
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// LastSampleForLabelMatchers implements Storage.
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func (s *NoopStorage) LastSampleForLabelMatchers(ctx context.Context, cutoff model.Time, matcherSets ...metric.LabelMatchers) (model.Vector, error) {
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return nil, nil
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}
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// QueryRange implements Storage.
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func (s *NoopStorage) QueryRange(ctx context.Context, from, through model.Time, matchers ...*metric.LabelMatcher) ([]SeriesIterator, error) {
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return nil, nil
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}
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// QueryInstant implements Storage.
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func (s *NoopStorage) QueryInstant(ctx context.Context, ts model.Time, stalenessDelta time.Duration, matchers ...*metric.LabelMatcher) ([]SeriesIterator, error) {
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return nil, nil
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}
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// MetricsForLabelMatchers implements Storage.
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func (s *NoopStorage) MetricsForLabelMatchers(
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ctx context.Context,
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from, through model.Time,
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matcherSets ...metric.LabelMatchers,
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) ([]metric.Metric, error) {
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return nil, nil
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}
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// LabelValuesForLabelName implements Storage.
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func (s *NoopStorage) LabelValuesForLabelName(ctx context.Context, labelName model.LabelName) (model.LabelValues, error) {
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return nil, nil
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}
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// DropMetricsForLabelMatchers implements Storage.
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func (s *NoopStorage) DropMetricsForLabelMatchers(ctx context.Context, matchers ...*metric.LabelMatcher) (int, error) {
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return 0, nil
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}
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// Append implements Storage.
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func (s *NoopStorage) Append(sample *model.Sample) error {
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return nil
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}
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// NeedsThrottling implements Storage.
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func (s *NoopStorage) NeedsThrottling() bool {
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return false
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}
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