storage

Documentation

Index

• Variables
• type Appender
• type BufferedSeriesIterator
  • func NewBuffer(it SeriesIterator, delta int64) *BufferedSeriesIterator
  • func (b *BufferedSeriesIterator) Buffer() SeriesIterator
  • func (b *BufferedSeriesIterator) Err() error
  • func (b *BufferedSeriesIterator) Next() bool
  • func (b *BufferedSeriesIterator) PeekBack(n int) (t int64, v float64, ok bool)
  • func (b *BufferedSeriesIterator) Seek(t int64) bool
  • func (b *BufferedSeriesIterator) Values() (int64, float64)
• type Querier
  • func NewMergeQuerier(queriers []Querier) Querier
  • func NoopQuerier() Querier
• type Queryable
• type QueryableFunc
  • func (f QueryableFunc) Querier(ctx context.Context, mint, maxt int64) (Querier, error)
• type SelectParams
• type Series
• type SeriesIterator
• type SeriesSet
  • func NewMergeSeriesSet(sets []SeriesSet) SeriesSet
  • func NoopSeriesSet() SeriesSet
• type Storage
  • func NewFanout(logger log.Logger, primary Storage, secondaries ...Storage) Storage

Variables

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")
)

The errors exposed.

Types

type Appender

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
}

Appender provides batched appends against a storage.

type BufferedSeriesIterator

type BufferedSeriesIterator struct {
	// contains filtered or unexported fields
}

BufferedSeriesIterator wraps an iterator with a look-back buffer.

func NewBuffer

func NewBuffer(it SeriesIterator, delta int64) *BufferedSeriesIterator

NewBuffer returns a new iterator that buffers the values within the time range of the current element and the duration of delta before.

func (*BufferedSeriesIterator) Buffer

func (b *BufferedSeriesIterator) Buffer() SeriesIterator

Buffer returns an iterator over the buffered data.

func (*BufferedSeriesIterator) Err

func (b *BufferedSeriesIterator) Err() error

Err returns the last encountered error.

func (*BufferedSeriesIterator) Next

func (b *BufferedSeriesIterator) Next() bool

Next advances the iterator to the next element.

func (*BufferedSeriesIterator) PeekBack

func (b *BufferedSeriesIterator) PeekBack(n int) (t int64, v float64, ok bool)

PeekBack returns the nth previous element of the iterator. If there is none buffered, ok is false.

func (*BufferedSeriesIterator) Seek

func (b *BufferedSeriesIterator) Seek(t int64) bool

Seek advances the iterator to the element at time t or greater.

func (*BufferedSeriesIterator) Values

func (b *BufferedSeriesIterator) Values() (int64, float64)

Values returns the current element of the iterator.

type Querier

type Querier interface {
	// Select returns a set of series that matches the given label matchers.
	Select(*SelectParams, ...*labels.Matcher) (SeriesSet, error)

	// LabelValues returns all potential values for a label name.
	LabelValues(name string) ([]string, error)

	// Close releases the resources of the Querier.
	Close() error
}

Querier provides reading access to time series data.

func NewMergeQuerier

func NewMergeQuerier(queriers []Querier) Querier

NewMergeQuerier returns a new Querier that merges results of input queriers. NB NewMergeQuerier will return NoopQuerier if no queriers are passed to it, and will filter NoopQueriers from its arguments, in order to reduce overhead when only one querier is passed.

func NoopQuerier

func NoopQuerier() Querier

NoopQuerier is a Querier that does nothing.

type Queryable

type Queryable interface {
	// Querier returns a new Querier on the storage.
	Querier(ctx context.Context, mint, maxt int64) (Querier, error)
}

A Queryable handles queries against a storage.

type QueryableFunc

type QueryableFunc func(ctx context.Context, mint, maxt int64) (Querier, error)

QueryableFunc is an adapter to allow the use of ordinary functions as Queryables. It follows the idea of http.HandlerFunc.

func (QueryableFunc) Querier

func (f QueryableFunc) Querier(ctx context.Context, mint, maxt int64) (Querier, error)

Querier calls f() with the given parameters.

type SelectParams

type SelectParams struct {
	Step int64  // Query step size in milliseconds.
	Func string // String representation of surrounding function or aggregation.
}

SelectParams specifies parameters passed to data selections.

type 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
}

Series represents a single time series.

type SeriesIterator

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
}

SeriesIterator iterates over the data of a time series.

type SeriesSet

type SeriesSet interface {
	Next() bool
	At() Series
	Err() error
}

SeriesSet contains a set of series.

func NewMergeSeriesSet

func NewMergeSeriesSet(sets []SeriesSet) SeriesSet

NewMergeSeriesSet returns a new series set that merges (deduplicates) series returned by the input series sets when iterating.

func NoopSeriesSet

func NoopSeriesSet() SeriesSet

NoopSeriesSet is a SeriesSet that does nothing.

type Storage

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
}

Storage ingests and manages samples, along with various indexes. All methods are goroutine-safe. Storage implements storage.SampleAppender.

func NewFanout

func NewFanout(logger log.Logger, primary Storage, secondaries ...Storage) Storage

NewFanout returns a new fan-out Storage, which proxies reads and writes through to multiple underlying storages.