mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-11 14:53:49 +00:00
742 lines
18 KiB
Go
742 lines
18 KiB
Go
package logstorage
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import (
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"fmt"
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"math"
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"math/bits"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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)
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// valueType is the type of values stored in every column block.
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type valueType byte
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const (
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// valueTypeUnknown is used for determining whether the value type is unknown.
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valueTypeUnknown = valueType(0)
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// default encoding for column blocks. Strings are stored as is.
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valueTypeString = valueType(1)
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// column blocks with small number of unique values are encoded as dict.
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valueTypeDict = valueType(2)
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// uint values up to 2^8-1 are encoded into valueTypeUint8.
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// Every value occupies a single byte.
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valueTypeUint8 = valueType(3)
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// uint values up to 2^16-1 are encoded into valueTypeUint16.
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// Every value occupies 2 bytes.
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valueTypeUint16 = valueType(4)
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// uint values up to 2^31-1 are encoded into valueTypeUint32.
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// Every value occupies 4 bytes.
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valueTypeUint32 = valueType(5)
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// uint values up to 2^64-1 are encoded into valueTypeUint64.
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// Every value occupies 8 bytes.
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valueTypeUint64 = valueType(6)
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// floating-point values are encoded into valueTypeFloat64.
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valueTypeFloat64 = valueType(7)
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// column blocks with ipv4 addresses are encoded as 4-byte strings.
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valueTypeIPv4 = valueType(8)
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// column blocks with ISO8601 timestamps are encoded into valueTypeTimestampISO8601.
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// These timestamps are commonly used by Logstash.
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valueTypeTimestampISO8601 = valueType(9)
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)
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type valuesEncoder struct {
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// buf contains data for values.
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buf []byte
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// values contains encoded values.
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values []string
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}
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func (ve *valuesEncoder) reset() {
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ve.buf = ve.buf[:0]
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vs := ve.values
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for i := range vs {
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vs[i] = ""
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}
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ve.values = vs[:0]
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}
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// encode encodes values to ve.values and returns the encoded value type with min/max encoded values.
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func (ve *valuesEncoder) encode(values []string, dict *valuesDict) (valueType, uint64, uint64) {
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ve.reset()
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if len(values) == 0 {
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return valueTypeString, 0, 0
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}
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var vt valueType
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var minValue, maxValue uint64
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// Try dict encoding at first, since it gives the highest speedup during querying.
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// It also usually gives the best compression, since every value is encoded as a single byte.
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ve.buf, ve.values, vt = tryDictEncoding(ve.buf[:0], ve.values[:0], values, dict)
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if vt != valueTypeUnknown {
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return vt, 0, 0
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}
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ve.buf, ve.values, vt, minValue, maxValue = tryUintEncoding(ve.buf[:0], ve.values[:0], values)
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if vt != valueTypeUnknown {
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return vt, minValue, maxValue
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}
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ve.buf, ve.values, vt, minValue, maxValue = tryFloat64Encoding(ve.buf[:0], ve.values[:0], values)
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if vt != valueTypeUnknown {
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return vt, minValue, maxValue
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}
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ve.buf, ve.values, vt, minValue, maxValue = tryIPv4Encoding(ve.buf[:0], ve.values[:0], values)
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if vt != valueTypeUnknown {
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return vt, minValue, maxValue
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}
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ve.buf, ve.values, vt, minValue, maxValue = tryTimestampISO8601Encoding(ve.buf[:0], ve.values[:0], values)
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if vt != valueTypeUnknown {
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return vt, minValue, maxValue
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}
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// Fall back to default encoding, e.g. leave values as is.
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ve.values = append(ve.values[:0], values...)
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return valueTypeString, 0, 0
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}
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func getValuesEncoder() *valuesEncoder {
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v := valuesEncoderPool.Get()
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if v == nil {
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return &valuesEncoder{}
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}
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return v.(*valuesEncoder)
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}
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func putValuesEncoder(ve *valuesEncoder) {
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ve.reset()
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valuesEncoderPool.Put(ve)
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}
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var valuesEncoderPool sync.Pool
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type valuesDecoder struct {
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buf []byte
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}
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func (vd *valuesDecoder) reset() {
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vd.buf = vd.buf[:0]
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}
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// decodeInplace decodes values encoded with the given vt and the given dict inplace.
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//
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// the decoded values remain valid until vd.reset() is called.
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func (vd *valuesDecoder) decodeInplace(values []string, vt valueType, dict *valuesDict) error {
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// do not reset vd.buf, since it may contain previously decoded data,
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// which must be preserved until reset() call.
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dstBuf := vd.buf
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switch vt {
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case valueTypeString:
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// nothing to do - values are already decoded.
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case valueTypeUint8:
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for i, v := range values {
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if len(v) != 1 {
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return fmt.Errorf("unexpected value length for uint8; got %d; want 1", len(v))
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}
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n := uint64(v[0])
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dstLen := len(dstBuf)
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dstBuf = strconv.AppendUint(dstBuf, n, 10)
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values[i] = bytesutil.ToUnsafeString(dstBuf[dstLen:])
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}
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case valueTypeUint16:
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for i, v := range values {
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if len(v) != 2 {
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return fmt.Errorf("unexpected value length for uint16; got %d; want 2", len(v))
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}
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b := bytesutil.ToUnsafeBytes(v)
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n := uint64(encoding.UnmarshalUint16(b))
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dstLen := len(dstBuf)
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dstBuf = strconv.AppendUint(dstBuf, n, 10)
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values[i] = bytesutil.ToUnsafeString(dstBuf[dstLen:])
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}
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case valueTypeUint32:
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for i, v := range values {
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if len(v) != 4 {
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return fmt.Errorf("unexpected value length for uint32; got %d; want 4", len(v))
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}
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b := bytesutil.ToUnsafeBytes(v)
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n := uint64(encoding.UnmarshalUint32(b))
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dstLen := len(dstBuf)
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dstBuf = strconv.AppendUint(dstBuf, n, 10)
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values[i] = bytesutil.ToUnsafeString(dstBuf[dstLen:])
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}
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case valueTypeUint64:
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for i, v := range values {
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if len(v) != 8 {
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return fmt.Errorf("unexpected value length for uint64; got %d; want 8", len(v))
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}
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b := bytesutil.ToUnsafeBytes(v)
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n := encoding.UnmarshalUint64(b)
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dstLen := len(dstBuf)
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dstBuf = strconv.AppendUint(dstBuf, n, 10)
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values[i] = bytesutil.ToUnsafeString(dstBuf[dstLen:])
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}
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case valueTypeDict:
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dictValues := dict.values
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for i, v := range values {
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id := int(v[0])
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if id >= len(dictValues) {
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return fmt.Errorf("unexpected dictionary id: %d; it must be smaller than %d", id, len(dictValues))
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}
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values[i] = dictValues[id]
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}
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case valueTypeIPv4:
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for i, v := range values {
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if len(v) != 4 {
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return fmt.Errorf("unexpected value length for ipv4; got %d; want 4", len(v))
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}
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dstLen := len(dstBuf)
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dstBuf = toIPv4String(dstBuf, v)
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values[i] = bytesutil.ToUnsafeString(dstBuf[dstLen:])
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}
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case valueTypeTimestampISO8601:
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for i, v := range values {
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if len(v) != 8 {
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return fmt.Errorf("unexpected value length for uint64; got %d; want 8", len(v))
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}
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dstLen := len(dstBuf)
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dstBuf = toTimestampISO8601String(dstBuf, v)
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values[i] = bytesutil.ToUnsafeString(dstBuf[dstLen:])
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}
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case valueTypeFloat64:
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for i, v := range values {
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if len(v) != 8 {
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return fmt.Errorf("unexpected value length for uint64; got %d; want 8", len(v))
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}
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dstLen := len(dstBuf)
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dstBuf = toFloat64String(dstBuf, v)
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values[i] = bytesutil.ToUnsafeString(dstBuf[dstLen:])
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}
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default:
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return fmt.Errorf("unknown valueType=%d", vt)
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}
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vd.buf = dstBuf
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return nil
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}
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func toTimestampISO8601String(dst []byte, v string) []byte {
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b := bytesutil.ToUnsafeBytes(v)
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n := encoding.UnmarshalUint64(b)
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t := time.Unix(0, int64(n)).UTC()
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dst = t.AppendFormat(dst, iso8601Timestamp)
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return dst
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}
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func toIPv4String(dst []byte, v string) []byte {
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dst = strconv.AppendUint(dst, uint64(v[0]), 10)
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dst = append(dst, '.')
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dst = strconv.AppendUint(dst, uint64(v[1]), 10)
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dst = append(dst, '.')
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dst = strconv.AppendUint(dst, uint64(v[2]), 10)
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dst = append(dst, '.')
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dst = strconv.AppendUint(dst, uint64(v[3]), 10)
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return dst
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}
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func toFloat64String(dst []byte, v string) []byte {
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b := bytesutil.ToUnsafeBytes(v)
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n := encoding.UnmarshalUint64(b)
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f := math.Float64frombits(n)
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dst = strconv.AppendFloat(dst, f, 'g', -1, 64)
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return dst
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}
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func getValuesDecoder() *valuesDecoder {
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v := valuesDecoderPool.Get()
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if v == nil {
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return &valuesDecoder{}
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}
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return v.(*valuesDecoder)
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}
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func putValuesDecoder(vd *valuesDecoder) {
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vd.reset()
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valuesDecoderPool.Put(vd)
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}
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var valuesDecoderPool sync.Pool
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func tryTimestampISO8601Encoding(dstBuf []byte, dstValues, srcValues []string) ([]byte, []string, valueType, uint64, uint64) {
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u64s := encoding.GetUint64s(len(srcValues))
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defer encoding.PutUint64s(u64s)
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a := u64s.A
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var minValue, maxValue uint64
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for i, v := range srcValues {
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n, ok := tryParseTimestampISO8601(v)
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if !ok {
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return dstBuf, dstValues, valueTypeUnknown, 0, 0
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}
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a[i] = n
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if i == 0 || n < minValue {
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minValue = n
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}
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if i == 0 || n > maxValue {
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maxValue = n
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}
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}
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for _, n := range a {
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dstLen := len(dstBuf)
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dstBuf = encoding.MarshalUint64(dstBuf, n)
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v := bytesutil.ToUnsafeString(dstBuf[dstLen:])
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dstValues = append(dstValues, v)
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}
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return dstBuf, dstValues, valueTypeTimestampISO8601, minValue, maxValue
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}
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func tryParseTimestampISO8601(s string) (uint64, bool) {
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// Do not parse timestamps with timezone, since they cannot be converted back
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// to the same string representation in general case.
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// This may break search.
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if len(s) != len("2006-01-02T15:04:05.000Z") {
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return 0, false
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}
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// Parse year
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if s[len("YYYY")] != '-' {
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return 0, false
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}
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yearStr := s[:len("YYYY")]
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n, ok := tryParseUint64(yearStr)
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if !ok || n > 3000 {
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return 0, false
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}
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year := int(n)
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s = s[len("YYYY")+1:]
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// Parse month
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if s[len("MM")] != '-' {
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return 0, false
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}
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monthStr := s[:len("MM")]
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n, ok = tryParseUint64(monthStr)
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if !ok || n < 1 || n > 12 {
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return 0, false
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}
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month := time.Month(n)
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s = s[len("MM")+1:]
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// Parse day
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if s[len("DD")] != 'T' {
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return 0, false
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}
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dayStr := s[:len("DD")]
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n, ok = tryParseUint64(dayStr)
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if !ok || n < 1 || n > 31 {
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return 0, false
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}
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day := int(n)
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s = s[len("DD")+1:]
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// Parse hour
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if s[len("HH")] != ':' {
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return 0, false
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}
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hourStr := s[:len("HH")]
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n, ok = tryParseUint64(hourStr)
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if !ok || n > 23 {
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return 0, false
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}
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hour := int(n)
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s = s[len("HH")+1:]
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// Parse minute
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if s[len("MM")] != ':' {
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return 0, false
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}
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minuteStr := s[:len("MM")]
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n, ok = tryParseUint64(minuteStr)
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if !ok || n > 59 {
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return 0, false
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}
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minute := int(n)
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s = s[len("MM")+1:]
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// Parse second
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if s[len("SS")] != '.' {
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return 0, false
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}
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secondStr := s[:len("SS")]
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n, ok = tryParseUint64(secondStr)
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if !ok || n > 59 {
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return 0, false
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}
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second := int(n)
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s = s[len("SS")+1:]
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// Parse millisecond
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tzDelimiter := s[len("000")]
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if tzDelimiter != 'Z' {
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return 0, false
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}
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millisecondStr := s[:len("000")]
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n, ok = tryParseUint64(millisecondStr)
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if !ok || n > 999 {
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return 0, false
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}
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millisecond := int(n)
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s = s[len("000")+1:]
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if len(s) != 0 {
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return 0, false
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}
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t := time.Date(year, month, day, hour, minute, second, millisecond*1e6, time.UTC)
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ts := t.UnixNano()
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return uint64(ts), true
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}
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func tryParseUint64(s string) (uint64, bool) {
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if len(s) == 0 || len(s) > 18 {
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return 0, false
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}
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n := uint64(0)
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for i := 0; i < len(s); i++ {
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ch := s[i]
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if ch < '0' || ch > '9' {
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return 0, false
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}
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n *= 10
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n += uint64(ch - '0')
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}
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return n, true
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}
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const iso8601Timestamp = "2006-01-02T15:04:05.000Z"
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func tryIPv4Encoding(dstBuf []byte, dstValues, srcValues []string) ([]byte, []string, valueType, uint64, uint64) {
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u32s := encoding.GetUint32s(len(srcValues))
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defer encoding.PutUint32s(u32s)
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a := u32s.A
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var minValue, maxValue uint32
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for i, v := range srcValues {
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n, ok := tryParseIPv4(v)
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if !ok {
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return dstBuf, dstValues, valueTypeUnknown, 0, 0
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}
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a[i] = n
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if i == 0 || n < minValue {
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minValue = n
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}
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if i == 0 || n > maxValue {
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maxValue = n
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}
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}
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for _, n := range a {
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dstLen := len(dstBuf)
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dstBuf = encoding.MarshalUint32(dstBuf, n)
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v := bytesutil.ToUnsafeString(dstBuf[dstLen:])
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dstValues = append(dstValues, v)
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}
|
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return dstBuf, dstValues, valueTypeIPv4, uint64(minValue), uint64(maxValue)
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}
|
|
|
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func tryParseIPv4(s string) (uint32, bool) {
|
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if len(s) < len("1.1.1.1") || len(s) > len("255.255.255.255") || strings.Count(s, ".") != 3 {
|
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// Fast path - the entry isn't IPv4
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return 0, false
|
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}
|
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|
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var octets [4]byte
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var v uint64
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var ok bool
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|
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// Parse octet 1
|
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n := strings.IndexByte(s, '.')
|
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if n <= 0 || n > 3 {
|
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return 0, false
|
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}
|
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v, ok = tryParseUint64(s[:n])
|
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if !ok || v > 255 {
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return 0, false
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}
|
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octets[0] = byte(v)
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s = s[n+1:]
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|
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// Parse octet 2
|
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n = strings.IndexByte(s, '.')
|
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if n <= 0 || n > 3 {
|
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return 0, false
|
|
}
|
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v, ok = tryParseUint64(s[:n])
|
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if !ok || v > 255 {
|
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return 0, false
|
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}
|
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octets[1] = byte(v)
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s = s[n+1:]
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|
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// Parse octet 3
|
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n = strings.IndexByte(s, '.')
|
|
if n <= 0 || n > 3 {
|
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return 0, false
|
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}
|
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v, ok = tryParseUint64(s[:n])
|
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if !ok || v > 255 {
|
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return 0, false
|
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}
|
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octets[2] = byte(v)
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s = s[n+1:]
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|
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// Parse octet 4
|
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v, ok = tryParseUint64(s)
|
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if !ok || v > 255 {
|
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return 0, false
|
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}
|
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octets[3] = byte(v)
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|
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ipv4 := encoding.UnmarshalUint32(octets[:])
|
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return ipv4, true
|
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}
|
|
|
|
func tryFloat64Encoding(dstBuf []byte, dstValues, srcValues []string) ([]byte, []string, valueType, uint64, uint64) {
|
|
u64s := encoding.GetUint64s(len(srcValues))
|
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defer encoding.PutUint64s(u64s)
|
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a := u64s.A
|
|
var minValue, maxValue float64
|
|
for i, v := range srcValues {
|
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f, ok := tryParseFloat64(v)
|
|
if !ok {
|
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return dstBuf, dstValues, valueTypeUnknown, 0, 0
|
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}
|
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a[i] = math.Float64bits(f)
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if i == 0 || f < minValue {
|
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minValue = f
|
|
}
|
|
if i == 0 || f > maxValue {
|
|
maxValue = f
|
|
}
|
|
}
|
|
for _, n := range a {
|
|
dstLen := len(dstBuf)
|
|
dstBuf = encoding.MarshalUint64(dstBuf, n)
|
|
v := bytesutil.ToUnsafeString(dstBuf[dstLen:])
|
|
dstValues = append(dstValues, v)
|
|
}
|
|
minValueU64 := math.Float64bits(minValue)
|
|
maxValueU64 := math.Float64bits(maxValue)
|
|
return dstBuf, dstValues, valueTypeFloat64, minValueU64, maxValueU64
|
|
}
|
|
|
|
func tryParseFloat64(s string) (float64, bool) {
|
|
if len(s) == 0 || len(s) > 20 {
|
|
return 0, false
|
|
}
|
|
// Allow only decimal digits, minus and a dot.
|
|
// Do not allows scientific notation (for example 1.23E+05),
|
|
// since it cannot be converted back to the same string form.
|
|
|
|
minus := s[0] == '-'
|
|
if minus {
|
|
s = s[1:]
|
|
}
|
|
n := strings.IndexByte(s, '.')
|
|
if n < 0 {
|
|
// fast path - there are no dots
|
|
n, ok := tryParseUint64(s)
|
|
if !ok {
|
|
return 0, false
|
|
}
|
|
f := float64(n)
|
|
if minus {
|
|
f = -f
|
|
}
|
|
return f, true
|
|
}
|
|
if n == 0 || n == len(s)-1 {
|
|
// Do not allow dots at the beginning and at the end of s,
|
|
// since they cannot be converted back to the same string form.
|
|
return 0, false
|
|
}
|
|
sInt := s[:n]
|
|
sFrac := s[n+1:]
|
|
nInt, ok := tryParseUint64(sInt)
|
|
if !ok {
|
|
return 0, false
|
|
}
|
|
nFrac, ok := tryParseUint64(sFrac)
|
|
if !ok {
|
|
return 0, false
|
|
}
|
|
f := math.FMA(float64(nFrac), math.Pow10(-len(sFrac)), float64(nInt))
|
|
if minus {
|
|
f = -f
|
|
}
|
|
return f, true
|
|
}
|
|
|
|
func tryUintEncoding(dstBuf []byte, dstValues, srcValues []string) ([]byte, []string, valueType, uint64, uint64) {
|
|
u64s := encoding.GetUint64s(len(srcValues))
|
|
defer encoding.PutUint64s(u64s)
|
|
a := u64s.A
|
|
var minValue, maxValue uint64
|
|
for i, v := range srcValues {
|
|
n, ok := tryParseUint64(v)
|
|
if !ok {
|
|
return dstBuf, dstValues, valueTypeUnknown, 0, 0
|
|
}
|
|
a[i] = n
|
|
if i == 0 || n < minValue {
|
|
minValue = n
|
|
}
|
|
if i == 0 || n > maxValue {
|
|
maxValue = n
|
|
}
|
|
}
|
|
|
|
minBitSize := bits.Len64(maxValue)
|
|
if minBitSize <= 8 {
|
|
for _, n := range a {
|
|
dstLen := len(dstBuf)
|
|
dstBuf = append(dstBuf, byte(n))
|
|
v := bytesutil.ToUnsafeString(dstBuf[dstLen:])
|
|
dstValues = append(dstValues, v)
|
|
}
|
|
return dstBuf, dstValues, valueTypeUint8, minValue, maxValue
|
|
}
|
|
if minBitSize <= 16 {
|
|
for _, n := range a {
|
|
dstLen := len(dstBuf)
|
|
dstBuf = encoding.MarshalUint16(dstBuf, uint16(n))
|
|
v := bytesutil.ToUnsafeString(dstBuf[dstLen:])
|
|
dstValues = append(dstValues, v)
|
|
}
|
|
return dstBuf, dstValues, valueTypeUint16, minValue, maxValue
|
|
}
|
|
if minBitSize <= 32 {
|
|
for _, n := range a {
|
|
dstLen := len(dstBuf)
|
|
dstBuf = encoding.MarshalUint32(dstBuf, uint32(n))
|
|
v := bytesutil.ToUnsafeString(dstBuf[dstLen:])
|
|
dstValues = append(dstValues, v)
|
|
}
|
|
return dstBuf, dstValues, valueTypeUint32, minValue, maxValue
|
|
}
|
|
for _, n := range a {
|
|
dstLen := len(dstBuf)
|
|
dstBuf = encoding.MarshalUint64(dstBuf, n)
|
|
v := bytesutil.ToUnsafeString(dstBuf[dstLen:])
|
|
dstValues = append(dstValues, v)
|
|
}
|
|
return dstBuf, dstValues, valueTypeUint64, minValue, maxValue
|
|
}
|
|
|
|
func tryDictEncoding(dstBuf []byte, dstValues, srcValues []string, dict *valuesDict) ([]byte, []string, valueType) {
|
|
dict.reset()
|
|
dstBufOrig := dstBuf
|
|
dstValuesOrig := dstValues
|
|
|
|
for _, v := range srcValues {
|
|
id, ok := dict.getOrAdd(v)
|
|
if !ok {
|
|
dict.reset()
|
|
return dstBufOrig, dstValuesOrig, valueTypeUnknown
|
|
}
|
|
dstLen := len(dstBuf)
|
|
dstBuf = append(dstBuf, id)
|
|
v := bytesutil.ToUnsafeString(dstBuf[dstLen:])
|
|
dstValues = append(dstValues, v)
|
|
}
|
|
return dstBuf, dstValues, valueTypeDict
|
|
}
|
|
|
|
type valuesDict struct {
|
|
values []string
|
|
}
|
|
|
|
func (vd *valuesDict) reset() {
|
|
vs := vd.values
|
|
for i := range vs {
|
|
vs[i] = ""
|
|
}
|
|
vd.values = vs[:0]
|
|
}
|
|
|
|
func (vd *valuesDict) copyFrom(src *valuesDict) {
|
|
vd.reset()
|
|
|
|
vd.values = append(vd.values[:0], src.values...)
|
|
}
|
|
|
|
func (vd *valuesDict) getOrAdd(k string) (byte, bool) {
|
|
if len(k) > maxDictSizeBytes {
|
|
return 0, false
|
|
}
|
|
vs := vd.values
|
|
dictSizeBytes := 0
|
|
for i, v := range vs {
|
|
if k == v {
|
|
return byte(i), true
|
|
}
|
|
dictSizeBytes += len(v)
|
|
}
|
|
if len(vs) >= maxDictLen || dictSizeBytes+len(k) > maxDictSizeBytes {
|
|
return 0, false
|
|
}
|
|
vs = append(vs, k)
|
|
vd.values = vs
|
|
|
|
return byte(len(vs) - 1), true
|
|
}
|
|
|
|
func (vd *valuesDict) marshal(dst []byte) []byte {
|
|
values := vd.values
|
|
if len(values) > maxDictLen {
|
|
logger.Panicf("BUG: valuesDict may contain max %d items; got %d items", maxDictLen, len(values))
|
|
}
|
|
dst = append(dst, byte(len(values)))
|
|
for _, v := range values {
|
|
dst = encoding.MarshalBytes(dst, bytesutil.ToUnsafeBytes(v))
|
|
}
|
|
return dst
|
|
}
|
|
|
|
func (vd *valuesDict) unmarshal(src []byte) ([]byte, error) {
|
|
vd.reset()
|
|
|
|
srcOrig := src
|
|
if len(src) < 1 {
|
|
return srcOrig, fmt.Errorf("cannot umarshal dict len from 0 bytes; need at least 1 byte")
|
|
}
|
|
dictLen := int(src[0])
|
|
src = src[1:]
|
|
for i := 0; i < dictLen; i++ {
|
|
tail, data, err := encoding.UnmarshalBytes(src)
|
|
if err != nil {
|
|
return srcOrig, fmt.Errorf("cannot umarshal value %d out of %d from dict: %w", i, dictLen, err)
|
|
}
|
|
src = tail
|
|
// Do not use bytesutil.InternBytes(data) here, since it works slower than the string(data) in prod
|
|
v := string(data)
|
|
vd.values = append(vd.values, v)
|
|
}
|
|
return src, nil
|
|
}
|
|
|
|
// maxDictSizeBytes is the maximum length of all the keys in the valuesDict
|
|
const maxDictSizeBytes = 256
|
|
|
|
// maxDictLen is the maximum number of entries in the valuesDict.
|
|
//
|
|
// it shouldn't exceed 255, since the dict len is marshaled into a single byte.
|
|
const maxDictLen = 8
|