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92 lines
2.6 KiB
92 lines
2.6 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 storage |
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import ( |
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"errors" |
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"github.com/prometheus/prometheus/pkg/labels" |
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) |
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var ( |
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ErrOutOfOrderSample = errors.New("out of order sample") |
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ErrDuplicateSampleForTimestamp = errors.New("duplicate sample for timestamp") |
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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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// Querier returns a new Querier on the storage. |
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Querier(mint, maxt int64) (Querier, error) |
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// Appender returns a new appender against the storage. |
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Appender() (Appender, error) |
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// Close closes the storage and all its underlying resources. |
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Close() error |
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} |
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// Querier provides reading access to time series data. |
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type Querier interface { |
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// Select returns a set of series that matches the given label matchers. |
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Select(...*labels.Matcher) SeriesSet |
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// LabelValues returns all potential values for a label name. |
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LabelValues(name string) ([]string, error) |
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// Close releases the resources of the Querier. |
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Close() error |
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} |
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// Appender provides batched appends against a storage. |
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type Appender interface { |
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SetSeries(labels.Labels) (uint64, error) |
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// Add adds a sample pair for the referenced series. |
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Add(ref uint64, t int64, v float64) error |
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// Commit submits the collected samples and purges the batch. |
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Commit() error |
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Rollback() error |
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} |
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// SeriesSet contains a set of series. |
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type SeriesSet interface { |
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Next() bool |
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At() Series |
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Err() error |
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} |
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// Series represents a single time series. |
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type Series interface { |
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// Labels returns the complete set of labels identifying the series. |
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Labels() labels.Labels |
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// Iterator returns a new iterator of the data of the series. |
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Iterator() SeriesIterator |
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} |
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// SeriesIterator iterates over the data of a time series. |
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type SeriesIterator interface { |
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// Seek advances the iterator forward to the value at or after |
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// the given timestamp. |
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Seek(t int64) bool |
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// At returns the current timestamp/value pair. |
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At() (t int64, v float64) |
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// Next advances the iterator by one. |
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Next() bool |
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// Err returns the current error. |
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Err() error |
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}
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