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// 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
|
