127 lines
3.9 KiB
Go
127 lines
3.9 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 (
|
|
"context"
|
|
"errors"
|
|
|
|
"github.com/prometheus/prometheus/pkg/labels"
|
|
)
|
|
|
|
// The errors exposed.
|
|
var (
|
|
ErrNotFound = errors.New("not found")
|
|
ErrOutOfOrderSample = errors.New("out of order sample")
|
|
ErrDuplicateSampleForTimestamp = errors.New("duplicate sample for timestamp")
|
|
ErrOutOfBounds = errors.New("out of bounds")
|
|
)
|
|
|
|
// Storage ingests and manages samples, along with various indexes. All methods
|
|
// are goroutine-safe. Storage implements storage.SampleAppender.
|
|
type Storage interface {
|
|
Queryable
|
|
|
|
// StartTime returns the oldest timestamp stored in the storage.
|
|
StartTime() (int64, error)
|
|
|
|
// Appender returns a new appender against the storage.
|
|
Appender() (Appender, error)
|
|
|
|
// Close closes the storage and all its underlying resources.
|
|
Close() error
|
|
}
|
|
|
|
// A Queryable handles queries against a storage.
|
|
type Queryable interface {
|
|
// Querier returns a new Querier on the storage.
|
|
Querier(ctx context.Context, mint, maxt int64) (Querier, 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(*SelectParams, ...*labels.Matcher) (SeriesSet, Warnings, error)
|
|
|
|
// LabelValues returns all potential values for a label name.
|
|
LabelValues(name string) ([]string, error)
|
|
|
|
// LabelNames returns all the unique label names present in the block in sorted order.
|
|
LabelNames() ([]string, error)
|
|
|
|
// Close releases the resources of the Querier.
|
|
Close() error
|
|
}
|
|
|
|
// SelectParams specifies parameters passed to data selections.
|
|
type SelectParams struct {
|
|
Start int64 // Start time in milliseconds for this select.
|
|
End int64 // End time in milliseconds for this select.
|
|
|
|
Step int64 // Query step size in milliseconds.
|
|
Func string // String representation of surrounding function or aggregation.
|
|
}
|
|
|
|
// QueryableFunc is an adapter to allow the use of ordinary functions as
|
|
// Queryables. It follows the idea of http.HandlerFunc.
|
|
type QueryableFunc func(ctx context.Context, mint, maxt int64) (Querier, error)
|
|
|
|
// Querier calls f() with the given parameters.
|
|
func (f QueryableFunc) Querier(ctx context.Context, mint, maxt int64) (Querier, error) {
|
|
return f(ctx, mint, maxt)
|
|
}
|
|
|
|
// Appender provides batched appends against a storage.
|
|
type Appender interface {
|
|
Add(l labels.Labels, t int64, v float64) (uint64, error)
|
|
|
|
AddFast(l labels.Labels, ref uint64, t int64, v float64) error
|
|
|
|
// Commit submits the collected samples and purges the batch.
|
|
Commit() error
|
|
|
|
Rollback() 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
|
|
}
|
|
|
|
type Warnings []error
|