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103 lines
4.6 KiB
103 lines
4.6 KiB
// Copyright 2014 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/client_golang/prometheus"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/storage/metric"
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)
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// Storage ingests and manages samples, along with various indexes. All methods
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// are goroutine-safe. Storage implements storage.SampleAppender.
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type Storage interface {
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prometheus.Collector
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// Append stores a sample in the Storage. Multiple samples for the same
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// fingerprint need to be submitted in chronological order, from oldest
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// to newest. When Append has returned, the appended sample might not be
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// queryable immediately. (Use WaitForIndexing to wait for complete
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// processing.) The implementation might remove labels with empty value
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// from the provided Sample as those labels are considered equivalent to
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// a label not present at all.
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Append(*model.Sample)
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// NewPreloader returns a new Preloader which allows preloading and pinning
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// series data into memory for use within a query.
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NewPreloader() Preloader
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// MetricsForLabelMatchers returns the metrics from storage that satisfy the given
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// label matchers. At least one label matcher must be specified that does not
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// match the empty string.
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MetricsForLabelMatchers(...*metric.LabelMatcher) map[model.Fingerprint]metric.Metric
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// LastSamplePairForFingerprint returns the last sample pair for the
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// provided fingerprint. If the respective time series does not exist or
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// has an evicted head chunk, nil is returned.
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LastSamplePairForFingerprint(model.Fingerprint) *model.SamplePair
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// Get all of the label values that are associated with a given label name.
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LabelValuesForLabelName(model.LabelName) model.LabelValues
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// Get the metric associated with the provided fingerprint.
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MetricForFingerprint(model.Fingerprint) metric.Metric
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// Construct an iterator for a given fingerprint.
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// The iterator will never return samples older than retention time,
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// relative to the time NewIterator was called.
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NewIterator(model.Fingerprint) SeriesIterator
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// Drop all time series associated with the given fingerprints. This operation
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// will not show up in the series operations metrics.
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DropMetricsForFingerprints(...model.Fingerprint)
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// Run the various maintenance loops in goroutines. Returns when the
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// storage is ready to use. Keeps everything running in the background
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// until Stop is called.
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Start() error
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// Stop shuts down the Storage gracefully, flushes all pending
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// operations, stops all maintenance loops,and frees all resources.
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Stop() error
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// WaitForIndexing returns once all samples in the storage are
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// indexed. Indexing is needed for FingerprintsForLabelMatchers and
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// LabelValuesForLabelName and may lag behind.
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WaitForIndexing()
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}
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// SeriesIterator enables efficient access of sample values in a series. Its
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// methods are not goroutine-safe. A SeriesIterator iterates over a snapshot of
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// a series, i.e. it is safe to continue using a SeriesIterator after or during
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// modifying the corresponding series, but the iterator will represent the state
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// of the series prior the modification.
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type SeriesIterator interface {
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// Gets the two values that are immediately adjacent to a given time. In
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// case a value exist at precisely the given time, only that single
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// value is returned. Only the first or last value is returned (as a
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// single value), if the given time is before or after the first or last
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// value, respectively.
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ValueAtTime(model.Time) []model.SamplePair
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// Gets the boundary values of an interval: the first and last value
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// within a given interval.
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BoundaryValues(metric.Interval) []model.SamplePair
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// Gets all values contained within a given interval.
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RangeValues(metric.Interval) []model.SamplePair
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}
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// A Preloader preloads series data necessary for a query into memory and pins
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// them until released via Close(). Its methods are generally not
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// goroutine-safe.
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type Preloader interface {
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PreloadRange(
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fp model.Fingerprint,
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from model.Time, through model.Time,
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stalenessDelta time.Duration,
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) error
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// Close unpins any previously requested series data from memory.
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Close()
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}
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