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reader.go
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reader.go
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package binary
import (
"bytes"
"errors"
"fmt"
"io"
"github.com/influxdata/influxdb/cmd/influx_tools/internal/tlv"
"github.com/influxdata/influxdb/tsdb"
"github.com/influxdata/influxdb/tsdb/engine/tsm1"
)
type Reader struct {
r io.Reader
pr *PointsReader
state *readerState
stats *readerStats
}
type readerStats struct {
series int
counts [8]struct {
series, values int
}
}
type readerState byte
const (
readHeader readerState = iota + 1
readBucket
readSeries
readPoints
done
)
func NewReader(reader io.Reader) *Reader {
state := readHeader
var stats readerStats
r := &Reader{r: reader, state: &state, stats: &stats,
pr: &PointsReader{r: reader, values: make(tsm1.Values, tsdb.DefaultMaxPointsPerBlock), state: &state, stats: &stats}}
return r
}
func (r *Reader) ReadHeader() (*Header, error) {
if *r.state != readHeader {
return nil, fmt.Errorf("expected reader in state %v, was in state %v\n", readHeader, *r.state)
}
var magic [len(Magic)]byte
n, err := r.r.Read(magic[:])
if err != nil {
return nil, err
}
if n < len(Magic) || !bytes.Equal(magic[:], Magic[:]) {
return nil, errors.New("IFLXDUMP header not present")
}
t, lv, err := tlv.ReadTLV(r.r)
if err != nil {
return nil, err
}
if t != byte(HeaderType) {
return nil, fmt.Errorf("expected header type, got %v", t)
}
h := &Header{}
err = h.Unmarshal(lv)
*r.state = readBucket
return h, err
}
func (r *Reader) Close() error {
return nil
}
func (r *Reader) NextBucket() (*BucketHeader, error) {
if *r.state != readBucket {
return nil, fmt.Errorf("expected reader in state %v, was in state %v", readBucket, *r.state)
}
t, lv, err := tlv.ReadTLV(r.r)
if err != nil {
if err == io.EOF {
*r.state = done
return nil, nil
}
return nil, err
}
if t != byte(BucketHeaderType) {
return nil, fmt.Errorf("expected bucket header type, got %v", t)
}
bh := &BucketHeader{}
err = bh.Unmarshal(lv)
if err != nil {
return nil, err
}
*r.state = readSeries
return bh, nil
}
func (r *Reader) NextSeries() (*SeriesHeader, error) {
if *r.state != readSeries {
return nil, fmt.Errorf("expected reader in state %v, was in state %v", readSeries, *r.state)
}
t, lv, err := tlv.ReadTLV(r.r)
if err != nil {
return nil, err
}
if t == byte(BucketFooterType) {
*r.state = readBucket
return nil, nil
}
if t != byte(SeriesHeaderType) {
return nil, fmt.Errorf("expected series header type, got %v", t)
}
sh := &SeriesHeader{}
err = sh.Unmarshal(lv)
if err != nil {
return nil, err
}
r.stats.series++
r.stats.counts[sh.FieldType&7].series++
var pointsType MessageType
switch sh.FieldType {
case FloatFieldType:
pointsType = FloatPointsType
case IntegerFieldType:
pointsType = IntegerPointsType
case UnsignedFieldType:
pointsType = UnsignedPointsType
case BooleanFieldType:
pointsType = BooleanPointsType
case StringFieldType:
pointsType = StringPointsType
default:
return nil, fmt.Errorf("unsupported series field type %v", sh.FieldType)
}
*r.state = readPoints
r.pr.Reset(pointsType)
return sh, nil
}
func (r *Reader) Points() *PointsReader {
return r.pr
}
type PointsReader struct {
pointsType MessageType
r io.Reader
values tsm1.Values
n int
state *readerState
stats *readerStats
}
func (pr *PointsReader) Reset(pointsType MessageType) {
pr.pointsType = pointsType
pr.n = 0
}
func (pr *PointsReader) Next() (bool, error) {
if *pr.state != readPoints {
return false, fmt.Errorf("expected reader in state %v, was in state %v", readPoints, *pr.state)
}
t, lv, err := tlv.ReadTLV(pr.r)
if err != nil {
return false, err
}
if t == byte(SeriesFooterType) {
*pr.state = readSeries
return false, nil
}
if t != byte(pr.pointsType) {
return false, fmt.Errorf("expected message type %v, got %v", pr.pointsType, t)
}
err = pr.marshalValues(lv)
if err != nil {
return false, err
}
return true, nil
}
func (pr *PointsReader) Values() tsm1.Values {
return pr.values[:pr.n]
}
func (pr *PointsReader) marshalValues(lv []byte) error {
switch pr.pointsType {
case FloatPointsType:
return pr.marshalFloats(lv)
case IntegerPointsType:
return pr.marshalIntegers(lv)
case UnsignedPointsType:
return pr.marshalUnsigned(lv)
case BooleanPointsType:
return pr.marshalBooleans(lv)
case StringPointsType:
return pr.marshalStrings(lv)
default:
return fmt.Errorf("unsupported points type %v", pr.pointsType)
}
}
func (pr *PointsReader) marshalFloats(lv []byte) error {
fp := &FloatPoints{}
err := fp.Unmarshal(lv)
if err != nil {
return err
}
for i, t := range fp.Timestamps {
pr.values[i] = tsm1.NewFloatValue(t, fp.Values[i])
}
pr.stats.counts[0].values += len(fp.Timestamps)
pr.n = len(fp.Timestamps)
return nil
}
func (pr *PointsReader) marshalIntegers(lv []byte) error {
ip := &IntegerPoints{}
err := ip.Unmarshal(lv)
if err != nil {
return err
}
for i, t := range ip.Timestamps {
pr.values[i] = tsm1.NewIntegerValue(t, ip.Values[i])
}
pr.stats.counts[1].values += len(ip.Timestamps)
pr.n = len(ip.Timestamps)
return nil
}
func (pr *PointsReader) marshalUnsigned(lv []byte) error {
up := &UnsignedPoints{}
err := up.Unmarshal(lv)
if err != nil {
return err
}
for i, t := range up.Timestamps {
pr.values[i] = tsm1.NewUnsignedValue(t, up.Values[i])
}
pr.stats.counts[2].values += len(up.Timestamps)
pr.n = len(up.Timestamps)
return nil
}
func (pr *PointsReader) marshalBooleans(lv []byte) error {
bp := &BooleanPoints{}
err := bp.Unmarshal(lv)
if err != nil {
return err
}
for i, t := range bp.Timestamps {
pr.values[i] = tsm1.NewBooleanValue(t, bp.Values[i])
}
pr.stats.counts[3].values += len(bp.Timestamps)
pr.n = len(bp.Timestamps)
return nil
}
func (pr *PointsReader) marshalStrings(lv []byte) error {
sp := &StringPoints{}
err := sp.Unmarshal(lv)
if err != nil {
return err
}
for i, t := range sp.Timestamps {
pr.values[i] = tsm1.NewStringValue(t, sp.Values[i])
}
pr.stats.counts[4].values += len(sp.Timestamps)
pr.n = len(sp.Timestamps)
return nil
}