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https://github.com/VictoriaMetrics/VictoriaMetrics.git
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32193b6059
Change the return values for these functions - now they return the unmarshaled result plus the size of the unmarshaled result in bytes, so the caller could re-slice the src for further unmarshaling. This improves performance of these functions in hot loops of VictoriaLogs a bit.
135 lines
2.9 KiB
Go
135 lines
2.9 KiB
Go
package logstorage
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import (
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"fmt"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
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)
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// Field is a single field for the log entry.
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type Field struct {
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// Name is the name of the field
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Name string
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// Value is the value of the field
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Value string
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}
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// Reset resets f for future re-use.
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func (f *Field) Reset() {
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f.Name = ""
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f.Value = ""
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}
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// String returns string representation of f.
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func (f *Field) String() string {
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name := getCanonicalColumnName(f.Name)
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return fmt.Sprintf("%q:%q", name, f.Value)
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}
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func (f *Field) marshal(dst []byte) []byte {
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dst = encoding.MarshalBytes(dst, bytesutil.ToUnsafeBytes(f.Name))
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dst = encoding.MarshalBytes(dst, bytesutil.ToUnsafeBytes(f.Value))
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return dst
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}
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func (f *Field) unmarshal(a *arena, src []byte) ([]byte, error) {
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srcOrig := src
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// Unmarshal field name
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b, nSize := encoding.UnmarshalBytes(src)
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if nSize <= 0 {
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return srcOrig, fmt.Errorf("cannot unmarshal field name")
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}
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src = src[nSize:]
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f.Name = a.copyBytesToString(b)
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// Unmarshal field value
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b, nSize = encoding.UnmarshalBytes(src)
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if nSize <= 0 {
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return srcOrig, fmt.Errorf("cannot unmarshal field value")
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}
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src = src[nSize:]
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f.Value = a.copyBytesToString(b)
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return src, nil
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}
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func appendFields(a *arena, dst, src []Field) []Field {
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for _, f := range src {
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dst = append(dst, Field{
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Name: a.copyString(f.Name),
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Value: a.copyString(f.Value),
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})
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}
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return dst
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}
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// rows is an aux structure used during rows merge
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type rows struct {
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fieldsBuf []Field
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timestamps []int64
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rows [][]Field
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}
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// reset resets rs
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func (rs *rows) reset() {
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fb := rs.fieldsBuf
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for i := range fb {
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fb[i].Reset()
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}
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rs.fieldsBuf = fb[:0]
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rs.timestamps = rs.timestamps[:0]
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rows := rs.rows
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for i := range rows {
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rows[i] = nil
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}
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rs.rows = rows[:0]
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}
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// appendRows appends rows with the given timestamps to rs.
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func (rs *rows) appendRows(timestamps []int64, rows [][]Field) {
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rs.timestamps = append(rs.timestamps, timestamps...)
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fieldsBuf := rs.fieldsBuf
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for _, fields := range rows {
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fieldsLen := len(fieldsBuf)
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fieldsBuf = append(fieldsBuf, fields...)
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rs.rows = append(rs.rows, fieldsBuf[fieldsLen:])
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}
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rs.fieldsBuf = fieldsBuf
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}
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// mergeRows merges the args and appends them to rs.
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func (rs *rows) mergeRows(timestampsA, timestampsB []int64, fieldsA, fieldsB [][]Field) {
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for len(timestampsA) > 0 && len(timestampsB) > 0 {
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i := 0
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minTimestamp := timestampsB[0]
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for i < len(timestampsA) && timestampsA[i] <= minTimestamp {
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i++
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}
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rs.appendRows(timestampsA[:i], fieldsA[:i])
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fieldsA = fieldsA[i:]
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timestampsA = timestampsA[i:]
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fieldsA, fieldsB = fieldsB, fieldsA
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timestampsA, timestampsB = timestampsB, timestampsA
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}
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if len(timestampsA) == 0 {
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rs.appendRows(timestampsB, fieldsB)
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} else {
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rs.appendRows(timestampsA, fieldsA)
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}
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}
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func getCanonicalColumnName(columnName string) string {
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if columnName == "" {
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return "_msg"
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}
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return columnName
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}
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