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package solomon
import (
"bytes"
"context"
"encoding/binary"
"io"
"a.yandex-team.ru/library/go/core/xerrors"
)
type errWriter struct {
w io.Writer
err error
}
func (ew *errWriter) binaryWrite(data interface{}) {
if ew.err != nil {
return
}
switch t := data.(type) {
case uint8:
ew.err = binary.Write(ew.w, binary.LittleEndian, data.(uint8))
case uint16:
ew.err = binary.Write(ew.w, binary.LittleEndian, data.(uint16))
case uint32:
ew.err = binary.Write(ew.w, binary.LittleEndian, data.(uint32))
default:
ew.err = xerrors.Errorf("binaryWrite not supported type %v", t)
}
}
func writeULEB128(w io.Writer, value uint32) error {
remaining := value >> 7
for remaining != 0 {
err := binary.Write(w, binary.LittleEndian, uint8(value&0x7f|0x80))
if err != nil {
return xerrors.Errorf("binary.Write failed: %w", err)
}
value = remaining
remaining >>= 7
}
err := binary.Write(w, binary.LittleEndian, uint8(value&0x7f))
if err != nil {
return xerrors.Errorf("binary.Write failed: %w", err)
}
return err
}
type spackMetric struct {
flags uint8
labelsCount uint32
labels bytes.Buffer
metric Metric
}
func (s *spackMetric) writeLabel(se *spackEncoder, namesIdx map[string]uint32, valuesIdx map[string]uint32, name string, value string) error {
s.labelsCount++
_, ok := namesIdx[name]
if !ok {
namesIdx[name] = se.nameCounter
se.nameCounter++
_, err := se.labelNamePool.WriteString(name)
if err != nil {
return err
}
err = se.labelNamePool.WriteByte(0)
if err != nil {
return err
}
}
_, ok = valuesIdx[value]
if !ok {
valuesIdx[value] = se.valueCounter
se.valueCounter++
_, err := se.labelValuePool.WriteString(value)
if err != nil {
return err
}
err = se.labelValuePool.WriteByte(0)
if err != nil {
return err
}
}
err := writeULEB128(&s.labels, uint32(namesIdx[name]))
if err != nil {
return err
}
err = writeULEB128(&s.labels, uint32(valuesIdx[value]))
if err != nil {
return err
}
return nil
}
func (s *spackMetric) writeMetric(w io.Writer) error {
metricValueType := valueTypeOneWithoutTS
if s.metric.getTimestamp() != nil {
metricValueType = valueTypeOneWithTS
}
// library/cpp/monlib/encode/spack/spack_v1_encoder.cpp?rev=r9098142#L190
types := uint8(s.metric.getType()<<2) | uint8(metricValueType)
err := binary.Write(w, binary.LittleEndian, types)
if err != nil {
return xerrors.Errorf("binary.Write types failed: %w", err)
}
err = binary.Write(w, binary.LittleEndian, uint8(s.flags))
if err != nil {
return xerrors.Errorf("binary.Write flags failed: %w", err)
}
err = writeULEB128(w, uint32(s.labelsCount))
if err != nil {
return xerrors.Errorf("writeULEB128 labels count failed: %w", err)
}
_, err = w.Write(s.labels.Bytes()) // s.writeLabels(w)
if err != nil {
return xerrors.Errorf("write labels failed: %w", err)
}
if s.metric.getTimestamp() != nil {
err = binary.Write(w, binary.LittleEndian, uint32(s.metric.getTimestamp().Unix()))
if err != nil {
return xerrors.Errorf("write timestamp failed: %w", err)
}
}
switch s.metric.getType() {
case typeGauge:
err = binary.Write(w, binary.LittleEndian, s.metric.getValue().(float64))
if err != nil {
return xerrors.Errorf("binary.Write gauge value failed: %w", err)
}
case typeCounter, typeRated:
err = binary.Write(w, binary.LittleEndian, uint64(s.metric.getValue().(int64)))
if err != nil {
return xerrors.Errorf("binary.Write counter value failed: %w", err)
}
case typeHistogram, typeRatedHistogram:
h := s.metric.getValue().(histogram)
err = h.writeHistogram(w)
if err != nil {
return xerrors.Errorf("writeHistogram failed: %w", err)
}
default:
return xerrors.Errorf("unknown metric type: %v", s.metric.getType())
}
return nil
}
type spackEncoder struct {
context context.Context
compression uint8
nameCounter uint32
valueCounter uint32
labelNamePool bytes.Buffer
labelValuePool bytes.Buffer
metrics Metrics
}
func NewSpackEncoder(ctx context.Context, compression CompressionType, metrics *Metrics) *spackEncoder {
if metrics == nil {
metrics = &Metrics{}
}
return &spackEncoder{
context: ctx,
compression: uint8(compression),
metrics: *metrics,
}
}
func (se *spackEncoder) writeLabels() ([]spackMetric, error) {
namesIdx := make(map[string]uint32)
valuesIdx := make(map[string]uint32)
spackMetrics := make([]spackMetric, len(se.metrics.metrics))
for idx, metric := range se.metrics.metrics {
m := spackMetric{metric: metric}
err := m.writeLabel(se, namesIdx, valuesIdx, metric.getNameTag(), metric.Name())
if err != nil {
return nil, err
}
for name, value := range metric.getLabels() {
if err := m.writeLabel(se, namesIdx, valuesIdx, name, value); err != nil {
return nil, err
}
}
spackMetrics[idx] = m
}
return spackMetrics, nil
}
func (se *spackEncoder) Encode(w io.Writer) (written int, err error) {
spackMetrics, err := se.writeLabels()
if err != nil {
return written, xerrors.Errorf("writeLabels failed: %w", err)
}
err = se.writeHeader(w)
if err != nil {
return written, xerrors.Errorf("writeHeader failed: %w", err)
}
written += HeaderSize
compression := CompressionType(se.compression)
cw := newCompressedWriter(w, compression)
err = se.writeLabelNamesPool(cw)
if err != nil {
return written, xerrors.Errorf("writeLabelNamesPool failed: %w", err)
}
err = se.writeLabelValuesPool(cw)
if err != nil {
return written, xerrors.Errorf("writeLabelValuesPool failed: %w", err)
}
err = se.writeCommonTime(cw)
if err != nil {
return written, xerrors.Errorf("writeCommonTime failed: %w", err)
}
err = se.writeCommonLabels(cw)
if err != nil {
return written, xerrors.Errorf("writeCommonLabels failed: %w", err)
}
err = se.writeMetricsData(cw, spackMetrics)
if err != nil {
return written, xerrors.Errorf("writeMetricsData failed: %w", err)
}
err = cw.Close()
if err != nil {
return written, xerrors.Errorf("close failed: %w", err)
}
switch compression {
case CompressionNone:
written += cw.(*noCompressionWriteCloser).written
case CompressionLz4:
written += cw.(*lz4CompressionWriteCloser).written
}
return written, nil
}
func (se *spackEncoder) writeHeader(w io.Writer) error {
if se.context.Err() != nil {
return xerrors.Errorf("streamSpack context error: %w", se.context.Err())
}
ew := &errWriter{w: w}
ew.binaryWrite(uint16(0x5053)) // Magic
ew.binaryWrite(uint16(0x0101)) // Version
ew.binaryWrite(uint16(24)) // HeaderSize
ew.binaryWrite(uint8(0)) // TimePrecision(SECONDS)
ew.binaryWrite(uint8(se.compression)) // CompressionAlg
ew.binaryWrite(uint32(se.labelNamePool.Len())) // LabelNamesSize
ew.binaryWrite(uint32(se.labelValuePool.Len())) // LabelValuesSize
ew.binaryWrite(uint32(len(se.metrics.metrics))) // MetricsCount
ew.binaryWrite(uint32(len(se.metrics.metrics))) // PointsCount
if ew.err != nil {
return xerrors.Errorf("binaryWrite failed: %w", ew.err)
}
return nil
}
func (se *spackEncoder) writeLabelNamesPool(w io.Writer) error {
if se.context.Err() != nil {
return xerrors.Errorf("streamSpack context error: %w", se.context.Err())
}
_, err := w.Write(se.labelNamePool.Bytes())
if err != nil {
return xerrors.Errorf("write labelNamePool failed: %w", err)
}
return nil
}
func (se *spackEncoder) writeLabelValuesPool(w io.Writer) error {
if se.context.Err() != nil {
return xerrors.Errorf("streamSpack context error: %w", se.context.Err())
}
_, err := w.Write(se.labelValuePool.Bytes())
if err != nil {
return xerrors.Errorf("write labelValuePool failed: %w", err)
}
return nil
}
func (se *spackEncoder) writeCommonTime(w io.Writer) error {
if se.context.Err() != nil {
return xerrors.Errorf("streamSpack context error: %w", se.context.Err())
}
if se.metrics.timestamp == nil {
return binary.Write(w, binary.LittleEndian, uint32(0))
}
return binary.Write(w, binary.LittleEndian, uint32(se.metrics.timestamp.Unix()))
}
func (se *spackEncoder) writeCommonLabels(w io.Writer) error {
if se.context.Err() != nil {
return xerrors.Errorf("streamSpack context error: %w", se.context.Err())
}
_, err := w.Write([]byte{0})
if err != nil {
return xerrors.Errorf("write commonLabels failed: %w", err)
}
return nil
}
func (se *spackEncoder) writeMetricsData(w io.Writer, metrics []spackMetric) error {
for _, s := range metrics {
if se.context.Err() != nil {
return xerrors.Errorf("streamSpack context error: %w", se.context.Err())
}
err := s.writeMetric(w)
if err != nil {
return xerrors.Errorf("write metric failed: %w", err)
}
}
return nil
}
|
