indexheader

Documentation

Index

• Constants
• Variables
• func WriteBinary(ctx context.Context, bkt objstore.BucketReader, id ulid.ULID, filename string) (err error)
• type BinaryReader
  • func NewBinaryReader(ctx context.Context, logger log.Logger, bkt objstore.BucketReader, dir string, ...) (*BinaryReader, error)
  • func (r *BinaryReader) Close() error
  • func (r BinaryReader) IndexVersion() int
  • func (r BinaryReader) LabelNames() []string
  • func (r BinaryReader) LabelValues(name string) ([]string, error)
  • func (r BinaryReader) LookupSymbol(o uint32) (string, error)
  • func (r BinaryReader) PostingsOffset(name string, value string) (index.Range, error)
• type BinaryTOC
• type FileWriter
  • func NewFileWriter(name string, size int) (*FileWriter, error)
  • func (fw *FileWriter) AddPadding(size int) error
  • func (fw *FileWriter) Close() error
  • func (fw *FileWriter) Flush() error
  • func (fw *FileWriter) Pos() uint64
  • func (fw *FileWriter) Remove() error
  • func (fw *FileWriter) Write(bufs ...[]byte) error
  • func (fw *FileWriter) WriteAt(buf []byte, pos uint64) error
• type Reader

Constants

const (
	// BinaryFormatV1 represents first version of index-header file.
	BinaryFormatV1 = 1

	// MagicIndex are 4 bytes at the head of an index-header file.
	MagicIndex = 0xBAAAD792
)

Variables

var NotFoundRangeErr = errors.New("range not found")

NotFoundRangeErr is an error returned by PostingsOffset when there is no posting for given name and value pairs.

Functions

func WriteBinary

func WriteBinary(ctx context.Context, bkt objstore.BucketReader, id ulid.ULID, filename string) (err error)

WriteBinary build index-header file from the pieces of index in object storage.

Types

type BinaryReader

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

func NewBinaryReader

func NewBinaryReader(ctx context.Context, logger log.Logger, bkt objstore.BucketReader, dir string, id ulid.ULID, postingOffsetsInMemSampling int) (*BinaryReader, error)

NewBinaryReader loads or builds new index-header if not present on disk.

func (*BinaryReader) Close

func (r *BinaryReader) Close() error

func (BinaryReader) IndexVersion

func (r BinaryReader) IndexVersion() int

func (BinaryReader) LabelNames

func (r BinaryReader) LabelNames() []string

func (BinaryReader) LabelValues

func (r BinaryReader) LabelValues(name string) ([]string, error)

func (BinaryReader) LookupSymbol

func (r BinaryReader) LookupSymbol(o uint32) (string, error)

func (BinaryReader) PostingsOffset

func (r BinaryReader) PostingsOffset(name string, value string) (index.Range, error)

TODO(bwplotka): Get advantage of multi value offset fetch.

type BinaryTOC

type BinaryTOC struct {
	// Symbols holds start to the same symbols section as index related to this index header.
	Symbols uint64
	// PostingsOffsetTable holds start to the the same Postings Offset Table section as index related to this index header.
	PostingsOffsetTable uint64
}

BinaryTOC is a table of content for index-header file.

type FileWriter

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

func NewFileWriter

func NewFileWriter(name string, size int) (*FileWriter, error)

TODO(bwplotka): Added size to method, upstream this.

func (*FileWriter) AddPadding

func (fw *FileWriter) AddPadding(size int) error

AddPadding adds zero byte padding until the file size is a multiple size.

func (*FileWriter) Close

func (fw *FileWriter) Close() error

func (*FileWriter) Flush

func (fw *FileWriter) Flush() error

func (*FileWriter) Pos

func (fw *FileWriter) Pos() uint64

func (*FileWriter) Remove

func (fw *FileWriter) Remove() error

func (*FileWriter) Write

func (fw *FileWriter) Write(bufs ...[]byte) error

func (*FileWriter) WriteAt

func (fw *FileWriter) WriteAt(buf []byte, pos uint64) error

type Reader

type Reader interface {
	io.Closer

	// IndexVersion returns version of index.
	IndexVersion() int

	// PostingsOffset returns start and end offsets of postings for given name and value.
	// The end offset might be bigger than the actual posting ending, but not larger than the whole index file.
	// NotFoundRangeErr is returned when no index can be found for given name and value.
	// TODO(bwplotka): Move to PostingsOffsets(name string, value ...string) []index.Range and benchmark.
	PostingsOffset(name string, value string) (index.Range, error)

	// LookupSymbol returns string based on given reference.
	// Error is return if the symbol can't be found.
	LookupSymbol(o uint32) (string, error)

	// LabelValues returns all label values for given label name or error.
	// If no values are found for label name, or label name does not exists,
	// then empty string is returned and no error.
	LabelValues(name string) ([]string, error)

	// LabelNames returns all label names.
	LabelNames() []string
}

Reader is an interface allowing to read essential, minimal number of index fields from the small portion of index file called header.