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90 lines
3.8 KiB
90 lines
3.8 KiB
// Copyright 2014 Prometheus Team
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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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clientmodel "github.com/prometheus/client_golang/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.
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type Storage interface {
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prometheus.Collector
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// AppendSamples stores a group of new samples. Multiple samples for the same
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// fingerprint need to be submitted in chronological order, from oldest to
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// newest (both in the same call to AppendSamples and across multiple calls).
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AppendSamples(clientmodel.Samples)
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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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// Get all of the metric fingerprints that are associated with the
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// provided label matchers.
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GetFingerprintsForLabelMatchers(metric.LabelMatchers) clientmodel.Fingerprints
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// Get all of the label values that are associated with a given label name.
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GetLabelValuesForLabelName(clientmodel.LabelName) clientmodel.LabelValues
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// Get the metric associated with the provided fingerprint.
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GetMetricForFingerprint(clientmodel.Fingerprint) clientmodel.COWMetric
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// Construct an iterator for a given fingerprint.
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NewIterator(clientmodel.Fingerprint) SeriesIterator
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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()
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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 GetFingerprintsForLabelMatchers and
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// GetLabelValuesForLabelName 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. All
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// methods are goroutine-safe. A SeriesIterator iterates over a snapshot of a
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// series, i.e. it is safe to continue using a SeriesIterator after modifying
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// the corresponding series, but the iterator will represent the state of the
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// 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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GetValueAtTime(clientmodel.Timestamp) metric.Values
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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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GetBoundaryValues(metric.Interval) metric.Values
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// Gets all values contained within a given interval.
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GetRangeValues(metric.Interval) metric.Values
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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 clientmodel.Fingerprint,
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from clientmodel.Timestamp, through clientmodel.Timestamp,
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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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