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119 lines
3.6 KiB
119 lines
3.6 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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"context"
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"errors"
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"github.com/prometheus/prometheus/pkg/labels"
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)
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// The errors exposed.
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var (
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ErrNotFound = errors.New("not found")
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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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ErrOutOfBounds = errors.New("out of bounds")
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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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Queryable
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// StartTime returns the oldest timestamp stored in the storage.
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StartTime() (int64, 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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// A Queryable handles queries against a storage.
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type Queryable interface {
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// Querier returns a new Querier on the storage.
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Querier(ctx context.Context, mint, maxt int64) (Querier, 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(*SelectParams, ...*labels.Matcher) (SeriesSet, error)
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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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// SelectParams specifies parameters passed to data selections.
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type SelectParams struct {
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Step int64 // Query step size in milliseconds.
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Func string // String representation of surrounding function or aggregation.
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}
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// QueryableFunc is an adapter to allow the use of ordinary functions as
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// Queryables. It follows the idea of http.HandlerFunc.
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type QueryableFunc func(ctx context.Context, mint, maxt int64) (Querier, error)
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// Querier calls f() with the given parameters.
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func (f QueryableFunc) Querier(ctx context.Context, mint, maxt int64) (Querier, error) {
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return f(ctx, mint, maxt)
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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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Add(l labels.Labels, t int64, v float64) (uint64, error)
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AddFast(l labels.Labels, 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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