prometheus/storage/interface.go
2017-01-02 13:33:37 +01:00

89 lines
2.6 KiB
Go

// Copyright 2014 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package storage
import (
"errors"
"github.com/prometheus/prometheus/pkg/labels"
)
var (
ErrOutOfOrderSample = errors.New("out of order sample")
ErrDuplicateSampleForTimestamp = errors.New("duplicate sample for timestamp")
)
// Storage ingests and manages samples, along with various indexes. All methods
// are goroutine-safe. Storage implements storage.SampleAppender.
type Storage interface {
// Querier returns a new Querier on the storage.
Querier(mint, maxt int64) (Querier, error)
// Appender returns a new appender against the storage.
Appender() (Appender, error)
// Close closes the storage and all its underlying resources.
Close() error
}
// Querier provides reading access to time series data.
type Querier interface {
// Select returns a set of series that matches the given label matchers.
Select(...*labels.Matcher) SeriesSet
// LabelValues returns all potential values for a label name.
LabelValues(name string) ([]string, error)
// Close releases the resources of the Querier.
Close() error
}
// Appender provides batched appends against a storage.
type Appender interface {
// Add adds a sample pair for the referenced series.
Add(lset labels.Labels, t int64, v float64) error
// Commit submits the collected samples and purges the batch.
Commit() error
}
// SeriesSet contains a set of series.
type SeriesSet interface {
Next() bool
At() Series
Err() error
}
// Series represents a single time series.
type Series interface {
// Labels returns the complete set of labels identifying the series.
Labels() labels.Labels
// Iterator returns a new iterator of the data of the series.
Iterator() SeriesIterator
}
// SeriesIterator iterates over the data of a time series.
type SeriesIterator interface {
// Seek advances the iterator forward to the value at or after
// the given timestamp.
Seek(t int64) bool
// At returns the current timestamp/value pair.
At() (t int64, v float64)
// Next advances the iterator by one.
Next() bool
// Err returns the current error.
Err() error
}